Tubing pipe what is it - Metals and their processing

Pipe tubing

Tubing (interpretation: tubing) is a component of pipelines of oil refineries, mining mines, and geological exploration. In some cases, products are used in house construction. Tubing is characterized by high strength characteristics and durability - the service life of the main line exceeds 20 years.

Production

For the production of pump and compressor pipes, high-strength steel grades are used, which contain an increased amount of carbon. Steel 30ХМА is often used. The requirement is due to the need to protect the walls of pipelines from oxidation by chemically aggressive media and the extracted and distilled liquids and gases themselves.

The production of tubing pipes in Russia is regulated by GOST 633-80. The document defines several groups of these products:

Tubing (standard) is a classic tube with a coupling connection. They ensure tightness of networks at internal pressure up to 50 MPa;
NKT-V are pipes whose connecting threads are brought out (upset);
NKB are pump-compressor tubes with external connecting threads, which are assembled into a pipeline without the use of a coupling;
NKM – with a high-tightness coupling connection for particularly important areas and substances.

GOST determines the size, weight of the tubing pipe, necessary tests and other conditions of production, quality control and storage.

Characteristics

Basic requirements for tubing pipes:

high resistance to aggressive environments that cause metal corrosion, as well as oxidation of transported media;
resistance to low and high temperatures;
plasticity is necessary for products to regulate the integrity of the line during heating/cooling and during internal pressure fluctuations. This parameter is ensured by the presence of plastic connections in different sections of the pipeline;
absolute tightness;
permeability of substances in the lumen of the pipe.

These qualities are regulated by various documents - GOST and individual specifications, which are available at each manufacturing enterprise.

The dimensions of the pipe tubing are specified in the assortment of the state standard:

nominal diameter (external, rounded to the nearest whole value) – 27114 mm;
length – 610 m (measured and unmeasured), can be adjusted according to customer needs.

Each product released from the conveyor has a mark from which you can find out all the defining characteristics: tubing pipe diameter, wall thickness, resistance value, grade or type of steel, name of the manufacturer.

Areas of use

Tubing pipes are used both for their intended and non-direct purposes. Initially they are intended for the oil industry:

completion of oil and gas wells;
bitumen extraction wells;
injection pipelines.

The specifics of the application determined the pipe tubing material, which is distinguished by high performance indicators. Over time, the products began to be used for other purposes:

arrangement of water pipelines in private and multi-apartment construction;
use as supporting structures for installing foundations, fences and other vertical structures.

Screw piles of different load-bearing capacities are made from tubing by welding blades to the pipe.

Basic rules for installation and operation

The coupling connection is useful for assembling pipes in oil wells - lines and columns can be disassembled, moved, and repaired if necessary. For installation, different types of couplings are used:

Using such systems, you can get a highway of any shape.

For pipes not equipped with a threaded element, the only possible installation method is welding. They are most often used in civil engineering.

There are several rules to remember when choosing tubing pipes as a piping system in a house or as a pile:

unloading of products must be carried out on a flat, pre-prepared area;
to prevent sagging and maintain the evenness of the pipe, it is laid on wooden blocks laid transversely under the entire length of the product;
Carrying products by drag is prohibited;
before starting installation, it is necessary to go over the threads with a wire brush to remove dirt and possible corrosion products, while leaving a protective lubricant - it will help to make a quality connection;
In no case should pipes be subjected to mechanical shock, for example, compaction or installation into the design position using a sledgehammer - this will easily damage the integrity of the wall and reduce the quality of the pipeline.

These rules apply to the use of tubing in any industry - both in industry and in civil engineering.

What electrodes should be used to weld a tubing pipe?

To connect pipes without a threaded connection, only welding is used. In this case, you can only use arc welding with coated electrodes under submerged arcs or in shielding gases, which will ensure high strength of the seam.

The problem is that for the manufacture of pipes they use medium and high alloy steel, which has high strength, density and refractoriness.

Specialists select electrodes based on the characteristics of the metal and the climatic conditions of the area during the period of work.

For private practice, you can choose the classic SSSI 13/45 or 13/55, the seam holds optimally and is enough for a long period of operation. However, in this matter, much depends on both the power of the device and the skill of the welder himself.

Engineering Communication
Foundation

Source: https://stroikadialog.ru/articles/communikacii/nkt-truby

Tubing pipe (pump-compressor): what is it

The wide performance characteristics of tubing pipes allow the products to be used not only in the oil and gas industry, but also in private house construction.

Tubing pipe

They are effective in performing repair and hoisting tasks. They differ in size, diameter and weight. They can be treated with a special coating, which extends the service life by 20 years.

What is tubing?

The abbreviation NKT stands for pump-compressor pipe . With its help, a wide range of work is performed, from pumping gas and liquid from the well cavity to carrying out various repair work inside it.

By isolating the flow from the well walls, it prevents the formation of corrosion, erosion, as well as the formation of sand and asphaltenes deposits. Tubing sizes can vary from 50.8 to 139.7 mm in diameter. Their purpose depends on the fluid with which they work.

Thus, they distinguish:

models for completing oil wells;
models for equipment of gas wells;
models for injection wells;
models for equipping wells for bitumen extraction.

Up to several tubing strings can be operated simultaneously in one well. Their main difference from traditional casing pipes is mobility. They can be removed from the well if replacement or repair is needed. While casing analogues are cemented and installed permanently. Also recently, models that do not need to be replaced have been used.

Tubing pipe

Such a pump-compressor pipe performs the following functions:

the ability to carry out acid work, measure pressure, find water occurrences;
the ability to circulate the discharge and prevent pressure build-up between the tubing and casing;
possibility of perforating horizons for assembly.

Such pumping and well equipment can reach 20 years of operation without being removed to the soil surface.

Types of compressor pipe

There are two types of tubing:

The first type of equipment - a sleeveless pipe - is operated under pressure conditions of up to 50 MPa. It is up to this indicator that it retains its performance characteristics and tightness. The ends of such a pipe are characterized by an outward landing, and its connections are characterized by maximum strength. High tightness can be achieved using conical sealing surfaces. They are located behind the trapezoidal thread.

coupling pipe also operates under a pressure of no more than 50 MPa. The strength of her joints shows up to 90% of her body's strength. The product is made of aluminum alloys. It is wear resistant to corrosion inhibitors. Despite the light weight of the material, it is 2.5 times stronger than its steel counterpart, which makes it possible to construct columns 2.5 times longer than steel columns.

Coupled pipes are divided into the following subtypes:

model with a smooth surface, conical thread of a triangular profile;
model with a smooth, highly sealed surface, conical thread of a trapezoidal type profile;
model with a smooth surface, conical thread of a triangular profile (has increased ductility and resistance to low temperatures).

Products are also produced with a protective coating designed to prevent deposits on their surface in the form of paraffin, salts, gypsum, etc.

How is tubing repair carried out?

Tubing pipe with a special coating lasts longer. From time to time it requires cleaning in the form of chemical treatment or mechanical removal of deposits. They are aimed at removing asphaltenes, resins, and paraffins. In addition to these cleaning methods, magnetic, thermal and dewaxing methods are also used.

In some cases, cleaning itself is not enough and repair is required, which includes a wide range of steps to restore the operational characteristics of the material. Repair of pumping and well equipment can be carried out with pipes whose dimensions are 60, 73, 89, 102, 114 mm in diameter.

Their repair includes the following stages:

Rejection of the product by visual inspection.
Cleaning the product with water.
Mechanical removal of contaminants from the inner surface of the product.
Templating.
Identification and elimination of product defects.
Turning – includes re-threading, as well as repair and cleaning of the coupling.
Coupling twist.
Testing the system with water.
Test of strength.
Mandatory product labeling.
Treatment of the coupling and nipple parts with a lubricant.

Tubing coupling pipe

To ensure that the repair of the material has a longer lasting effect, special spraying is used. Its surface is treated with a diffusion zinc coating, which demonstrates high adhesion to iron and a repellent effect to paraffins. This coating can extend the service life of the system by 3-5 times.

Specifications

According to GOST, product dimensions vary from 6 to 10.5 meters. If operational needs arise, the product can be extended up to 11.5 meters. The dimensions of their nominal outer diameter are 60; 73; 89; 114 mm. The dimensions of the wall thickness of the product can vary within 5.0; 5.5; 6.5; 7.0 mm.

Products are made from steel NKT 20, NKT 30 and steel NKT 30KhMA. During the production of products, any defects are excluded. Once detected, the product is sent for recycling. Its strength is characterized by groups D, K, E. During the manufacturing process, each unit of the product must be tested for tension, strength, hardness, cracking, impact strength and undergo hydrotesting.

Pipes 73 and 89 are produced with triangular or trapezoidal threads, and 60 and 114 mm - with triangular threads. The size of 89 millimeters corresponds to a wall thickness of 7.0 mm. The purpose of the 89 mm pipe is quite wide. It can be used not only in oil and gas production, but also in private housing construction for arranging pile foundations. Weight of a product with a diameter of 89 mm per 1 linear meter. is 13.5 kg.

Operating rules

In order for pipes to serve for a long time, it is necessary to adhere to certain rules for their operation. Mechanized pipe carriers are used for loading and transportation. Transportation of products by drag is not allowed. They should not bend or sag. The material should be protected from mechanical damage. Therefore, unloading is carried out by crane.

At the work site, it should not be laid on bare ground, but on wooden blocks to avoid contamination or deformation. A safety ring must be placed on the threaded part.

Before operation, it is necessary to control the products by templates. To do this, a meter-long template with a diameter 2.3 mm narrower than its internal diameter is passed through the line. It is also worth cleaning the threads and coupling with a brush. Treat the surface of the parts with a special lubricant. Screwing the coupling from the thread is carried out carefully. In this case, you cannot use mechanical pressure or blows.

Source: https://trubypro.ru/materialy/metal/truba-nkt-nasosno-kompressornaya.html

What is tubing pipe

» Miscellaneous » What is tubing pipe

Tubing pipe

Extracting liquid or gas from wells is the purpose of tubing. They are also used for pumping compressed air and water. All kinds of well repair work constitute another area.

Kinds

There are two types of pump and compressor products according to GOST 633-80, which are produced with significant differences in the structure of the ends: they can be made smooth, or with external threads. If the ends are set outward, this allows a device such as a coupling to be screwed onto the part. The lubricant that is applied to the thread acts as a sealant and anti-corrosion coating.

Characteristics of strength groups of tubing pipes

Decryption

The marking, located approximately half a meter from the edge of the product, contains information about its diameter, what strength group the steel belongs to, its thickness, the product mark, and the date of manufacture. Smooth products and couplings provided for them are made from steel belonging to strength groups K, E, L, M. Threaded parts are made from steel of the following groups: D, K, E, L, M.

The length of the products produced ranges from 6 to 10.5 m. Sometimes pipes are made whose length reaches 11.5 m.

The diameter of the tubing is in relation to the parameters of their walls: • thickness 0.3 cm d -27 mm; • thickness 0.35 cm - d - 33 and 42 mm; • thickness 0.4 cm - d - 48 mm; • thickness 0.5 cm d - 60 mm; • thickness 0.67 and 0.7 cm - d -73 mm; • thickness 0.8 cm - d - 89 mm; • thickness 0.65 cm - d - 102 mm;

• thickness 0.7 cm - d - 114 mm.

o-trubah.com

Pump and compressor pipes - why are they needed?

When operating oil and gas wells, through which liquid and gaseous substances are transported, tubing is actively used. They will be discussed in this article.

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With the help of these pipes, operating in aggressive environments with which they constantly interact, and severe mechanical loads, gas and liquids can be delivered to the surface of wells from the productive zone.

Tubing products, in addition, protect casing pipes from erosion and corrosion phenomena, asphaltenes and paraffin coatings due to the fact that they are used as an insulator of transported flows from the walls of the well.

They are also used for special hoisting and repair work.

In connection with all of the above, we can identify four main properties that the described products must have. These include:

permeability of pipes in difficult areas of wellbores (for example, in areas of strong curvature);
perfect tightness of product column connections;
high wear resistance;
sufficient strength.

The tubing is installed into the well using packers (fixing elements) after the casing pipes have been installed and cemented. The connection of individual sections of tubing pipes, which can be up to 11.5 meters in length, is carried out using couplings. The cross-section of pumping and compressor products can vary within a fairly wide range from 50.8 to 139.7 millimeters (respectively, from 2 to 5.5 inches).

The pipes in question are classified according to several characteristics. One of them is the type of fluid being pumped out. Depending on it, products may be intended for:

gas and water injection wells;
oil wells;
wells for the extraction of heavy oil (in other words, bitumen);
gas wells.

The domestic standard for pump and compressor pipes (GOST 633–80) divides products into three types:

smooth coupling pipes of triangular profile with conical threads with high cold resistance and ductility;
smooth with sealing unit;
highly tight smooth coupling products of trapezoidal profile with conical thread;
smooth couplings of triangular profile with conical threads.

An analogue of the Russian State Standard is API 5CT, a US regulatory document that has been adopted in a number of countries around the world.

Pumping and compressor products, unlike casing pipes, can be dismantled for repair or replacement of a certain section of the pipeline. Moreover, this extraction operation can be performed 2–3 times during the operation of the products.

In this regard, when designing tubing columns (they are several pipes connected in series), engineers take into account the need for their efficient, fast and safe installation, as well as the possibility of prompt reinstallation or removal if necessary.

It is allowed to install several tubing strings in one well if production is carried out simultaneously from different horizons, or just one. As a rule, designers do not envisage installing more than two columns in one well. They often direct their attention to ensuring that wells are equipped with pipes that can be used for a long time and do not require regular replacement.

Note that modern tubing products usually perform several different functions that allow:

carry out acid work, water detection, system testing, pressure measurement through pumping products;
perforate productive horizons when harvesting;
reduce the likelihood of pressure developing between the casing and the pipe (that is, in the annular space), ensure circulation of the discharge to the surface.

Any tubing string today should:

have high tensile strength;
guarantee optimal flow;
not to succumb to the loads that are generated during stimulation work (hydraulic fracturing, acid treatment, etc.) in the pipeline;
ensure that the flow is transported in a closed state at its highest pressure (surface);
have maximum erosion potential and corrosion potential throughout the life of the gas or oil well;
be equipped with reliable couplings that can withstand tensile and compressive forces, and also do not leak

If the products meet the specified requirements, the columns can last up to 20 years without the need to remove them from the well.

The products we are interested in are made from different materials:

fiberglass: pipes made from it are usually installed in wells with ESP (electric centrifugal pumps), disposal and injection wells;
steel grades 30ХМА, 30 (hot-rolled sheets), 20 and some others: if finished metal pipes have even the slightest deviation from GOST, they are melted down;
aluminum-based alloys: make it possible to avoid introducing substances into structures that suppress corrosion, as they are characterized by a high level of resistance to hydrogen sulfide corrosion. The low weight of aluminum pipes also allows them to be manufactured in greater lengths compared to traditional metal structures.

Many manufacturers, including Russian ones, apply special coatings to tubing products to protect against corrosion, salt deposits, paraffin, and gypsum, which increases the service life of pipes and reduces the number of routine and planned repairs.

Coatings (varnishes with special properties, epoxy resins, liquid glass) are used to treat the inner surface of the columns.

Please note that stainless steel pipes are not used for well construction, so tubing products with special coatings are the only option for protecting pipelines from negative influences.

All pump pipes are subject to strict inspection for:

sulfide corrosion cracking;
hardness;
stretching;
water resistance;
impact strength.

If at least one point of testing is not passed, the product is sent for recycling; it is strictly prohibited to use it for its intended purpose.

High requirements for the quality of pipes are complemented by special conditions for their storage, transportation, and installation. It is important to follow the following rules:

Do not store products on the ground; they should be placed on wooden blocks to protect them from contamination and sagging. It is advisable to organize special sites for storing pipes if they are planned for long-term storage.
Transportation should be carried out using mechanized pipe carriers, and unloading (and loading) should be done using a crane. Structures cannot be transported by drag.
It is forbidden to hit the coupling with a sledgehammer in order to speed up the process of unscrewing or making up the tubing. These procedures can be facilitated by using a lubricant to treat threaded connections and by cleaning couplings and threads from dirt with a brush with metal bristles.
Safety rings are placed on the pipe threads during transportation.

Let us add that when removing pipes from the well, they need to be stored on walkways, between the rows of which wooden pads are installed.

tutmet.ru

Tubing pipe: the optimal solution for gas and oil wells

Tubing is the basis of communications in the oil and gas industry. The functioning of the oil and gas industry, geological exploration and drilling of artesian wells is impossible without reliable specialized equipment. These products are used not only in the oil and gas industry, but also for supplying water from artesian wells and for transporting compressed air under pressure.

Tubing pipes are used in the oil and gas industry to transport aggressive media

Basic requirements for standardization of tubing pipes

Tubing is the basis of communications in the oil and gas industry. They are highly reliable and durable. Connecting couplings and smooth workpieces are produced from durable steel grades D, E, K, L and M.

All requirements for the production of products are provided for by the standards of GOST 633-80, according to which specialized enterprises produce the following varieties:

standard tubing pipes with couplings;
highly hermetic NCM products;
with NKT-V threads set outside;
couplingless pipes NKB.

It is allowed to produce products according to specifications (technical conditions of the enterprise):

Source: https://www.doka-metal.ru/raznoe/chto-takoe-truba-nkt.html

Why do we choose tubing pipes even though they are used?

Tubing pipes (tubing) have a high strength index and are also distinguished by thick walls (ranging from 5 to 8 mm). In addition, they do not have seams. In accordance with GOST 633-80, these products are able to withstand hydraulic pressure of 1000 Atm., minimum.

The impeccable quality of tubing pipes is due to their use in important production areas (oil and gas production industry), as well as significant probable losses in the event of accidents at wells.

After the pipe’s regulatory period of operation expires, it is dismantled and becomes a secondary market product, but its status as a used product does not affect its popularity, since in this case the tubing is in great demand.

Our organization buys tubing pipes that have been dismantled and then uses them to produce metal fence posts. In addition, we use this recycled material to produce all kinds of supports for building structures, which are indispensable in household farming. The scope of use of pipes of this type is unusually large:

load-bearing supports;
fence posts;
frames and supports for a variety of outbuildings, gazebos, patios and verandas.

Tubing pipes with a diameter of 89, as well as 144 and 102 mm, are also used to create a pile foundation. Used tubing pipes can safely be called a unique material that is indispensable in home construction.

The excellent quality of steel, the use of seamless technology in their manufacture - all this allows them to have excellent performance characteristics and ensure the durability and reliability of the constructed structure.

What are the main advantages of fence posts made from used tubing pipes?

Tubing pipe wall thickness indicator

The main characteristic that affects the durability of the entire structure, as well as strength indicators, is the thickness of the pipe walls.

Today, a wide variety of different fences are offered, but they have one drawback - they are welded products, since when purchasing pipes, many manufacturers try to reduce costs.

It is also worth noting that many fence manufacturers purchase used welded pipe. The wall thickness of such “raw materials” ranges from 1.5 to 2.5 mm.

Of course, a pole with a wall size of 1.5 mm will fit under the so-called “chain-link” mesh with a low load rating, but its service life will not exceed five years due to the effects of a corrosion reaction.

In addition, such a product must be concreted in order to avoid its flattening due to heaving forces. The strength of the support, i.e. its load-bearing capacity is proportional to the cross-sectional area of the load-bearing element, as well as the tensile strength of the material itself.

Based on this, it can be noted that poles can be installed less frequently, and the fence itself can be erected higher, which will make it possible to save on materials and work.

If we consider the tubing pipe, then it is produced with a significant margin of safety. In accordance with GOST 633 - 80, the value of hydraulic pressure that a tubing pipe can withstand reaches a minimum of 1000 atmospheres. This is quite a lot of pressure, which is unattainable in everyday conditions.

For example, in a residential building the water pressure does not exceed 15 Atm (indicator of a high-rise building). Due to the presence of a thick wall, as well as the excellent quality of steel, poles made from tubing pipes can last at least half a century and can be used in the construction of solid fences with a height of 4 meters or more.

In addition, such pipes can be successfully used as load-bearing parts of structures, as well as piles in country house construction.

Seamless tubing pipes

When welding is carried out, the metal raw material is subject to significant changes, namely, the homogeneity of the metal structure is disrupted, and concentrations of high physical and chemical stresses are formed. Surely many have seen when, when bending welded pipes, the product is destroyed in the weld zone.

When used in a fence, such a pipe begins to rust (corrode) almost immediately after installation. Due to the rather large chemical stresses caused by welding, corrosion reactions proceed an order of magnitude faster along the welds.

This process spreads most quickly in the zone of transition of the installed column from the underground to the above-ground state, where the constant presence of oxygen and humidity creates an excellent environment for corrosion.

What is more unpleasant is that it is in this zone that stresses from loads (primarily due to wind) acting on the fence structure are concentrated. Based on this, it can be noted that a welded pipe will be destroyed an order of magnitude faster compared to a seamless one.

The production of tubing pipes is carried out using round heated blanks using the method of broaching and piercing. Welding is completely eliminated in the production process.

It is thanks to this factor, combined with the considerable thickness of the wall, that fence posts made from tubing pipes are characterized by a service life of at least 50 years.

Low cost of tubing pipes

A 3-meter pole intended for a fence and made from tubing measuring 73x5.5 mm is estimated at 565 rubles. A product of a similar type, created from a welded new pipe measuring 76x3.5 mm, costs about 660 rubles (2011 prices).

Suppliers in the Moscow region offer such products at prices ranging from 780 to 800 rubles, while in most cases the pipe wall is an order of magnitude lower (from 2.5 to 3 mm). After analyzing these figures, it is not difficult to draw a conclusion about a more profitable option.

Radioactivity

Let’s not ignore the radioactive safety of used tubing pipes. Our company purchases pipes only from fields belonging to the northern regions (Yamalo-Nenets Autonomous Okrug, Khanty-Mansi Autonomous Okrug). The advantages of such products are obvious:

no wall wear;
the aesthetics and durability of such products can be equated to new pipes.

But there is also a minus - a relatively high purchase price, as well as high transportation costs. But we know that the pipes we propose will not emit radiation, since oil fields located in the northern regions, as a rule, do not pose a radiation hazard.

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Many companies producing fences offer posts made from tubing pipes brought from the southern regions (Samara, Tatarstan, Bashkiria). Such products are much lower in purchase and this is due to the wear and tear of the wall, as well as inexpensive delivery to the capital. But, recently, information has appeared that a batch of tubing pipes that were susceptible to radioactive contamination entered the market.

Of course, such products should not enter the secondary market, since the continued use of such pipes is dangerous to life. It is also worth noting that they should not be transported outside the territory of the deposit, not to mention the region. But many turn a blind eye to this. Due to this feature, we carry out personal radio monitoring of pipes that arrive at our warehouse from the fields, so we can guarantee that our products are absolutely safe.

If the buyer wishes, we can measure the radiation level in his presence.

The radiation indicator of tubing pipes offered by our company is 0.10-0.20 μ3v/h with a standard value of 0.40. Reliability, strength and durability, safety - all these characteristics are possessed by our fences made from posts purchased by us. If we take into account the quality of our products, as well as their cost, then you will not find a more advantageous offer than ours.

Go to selecting material for the fence

Source: https://stroimaterial-moskva.ru/articles/pochemu-vybiraem-truby-nkt-nesmotrya-na-to-chto-oni-bu/

Tubing pipe

IA Neftegaz.RU. Pump and compressor pipes (tubing) are used to extract liquid and gas from wells, inject water, compressed air (gas) and carry out various types of work on routine and major workovers of wells (workover).

During the Soviet era, tubing was produced in different republics.

Tubing is used:

in the production of oil, gas and gas condensate,
while maintaining reservoir pressure,
when recycling produced water,
during capital (workover) and current repair of wells (TRS).

Tubing is used in harsh operating conditions: constant pressure, high mechanical loads, exposure to aggressive media on the walls, which leads to corrosion and erosion.

To ensure tightness and reliability, the tubing is fastened with a threaded connection.

Tubing nomenclature:

smooth,
smooth according to GOST 633-80,
smooth, highly airtight,
smooth, highly airtight according to GOST 633-80,
smooth with sealing unit,
smooth, highly airtight,
with the ends of the ARI 5ST set outwards, on which an external thread is cut, and a coupling is screwed onto one end,
with increased plasticity,
with increased cold resistance.

At a distance of 0.4 - 0.6 m from the end of the pipes, on the side of the couplings, a stamp is knocked out.

It indicates: nominal pipe diameter, mm; steel strength group; wall thickness, mm; trademark; month and year of issue.

Smooth pipes and couplings for them are made of steel of strength groups K, E, L, M, and pipes with upset ends are made of steel of strength groups D, K, E, L, M.

The surface of their threads is coated with a lubricant, which ensures the tightness of the connection and protects against scuffing and corrosion.

Couplingless pump and compressor pipes (NKP) ensure tight connections at pressures up to 50 MPa.

Their ends have a landing outside; the connection is very strong.

The tightness of the connections is ensured by conical sealing surfaces located behind the threads on the side of smaller diameters.

Trapezoidal threads are used to connect the pipes.

Coupled pump-compressor pipes (NKM) ensure tight connections at pressures up to 50 MPa.

The strength of the connections is up to 90% of the strength of the pipe body.

Trapezoidal threads are used to connect the pipes.

Pump and compressor pipes made of aluminum alloys.

Resistant to hydrogen sulfide corrosion, which eliminates the use of corrosion inhibitors.

Due to their low weight, the specific strength of aluminum pipes is 2.5 times higher than steel pipes.

This allows the column to be 2.5 times longer compared to a column made of steel pipes.

Pump and compressor pipes with protective coatings are used to prevent deposits of paraffin, salts and gypsum in them, as well as to protect against corrosion.

When using these pipes, the number of required routine repairs of wells is reduced and their service life is increased.

The inner surface of the tubing is covered with liquid glass, enamels, epoxy resins or varnishes.

The most common type is vitrification of pipes.

Fiberglass tubing. Used in injection wells of RPM systems; utilization wells; gas lift wells; production wells with ESP.

Operation of tubing. During operation, the following rules must be observed:

Mechanized pipe carriers should be used for loading, transporting and unloading pipes.

It is prohibited to transport pipes by dragging; they must not be allowed to sag or bend during transportation.

You should also not dump them on the ground; you must use a crane.

Pipes should be laid on the site, placing wooden blocks under them to protect them from sagging and contamination.

The tubing must not be laid on the ground.

A safety ring must be screwed onto the threaded part of each pipe.

In order to check the condition of the pipes, before lifting from the walkway, it is necessary to pass a template 0.5 - 1.0 m long and with a diameter 2 - 3 mm less than its internal diameter through the pipe.

The lower end of the pipe must be supported, ensuring that the template comes out.

Before screwing the pipe together, it is necessary to thoroughly clean the threads of both the coupling and nipple from dirt with a metal brush and lubricate the threads with a special lubricant.

It is not allowed to hit the coupling with a handbrake (sledgehammer) in order to facilitate screwing or unscrewing pipes.

When lifting from a well, pipes should be laid on walkways with wooden linings between the rows.

Production and operation of tubing pipes

Full functioning of wells in oil and gas fields is impossible without the use of tubing, which is the subject of this article.

Tubing pipes in storage

Types and characteristics of pumping and compressor pipes

The main function performed by tubing is to transport gases and liquids produced in the productive zone to the well surface.

In addition, tubing acts as a kind of insulator that protects the gas and liquid transported through it from the well walls, and also prevents the occurrence and development of corrosion, paraffin and asphaltene deposits on the casing pipes.

The tubing pipe placed in the well is also necessary to ensure the carrying out of tripping and repair work, which is regularly needed.

Taking into account all these factors, it becomes clear that tubing during its operation experiences significant loads and is in constant contact with aggressive environments, which determines serious requirements for their quality.

Such requirements include, in particular:

high permeability even in areas of wellbores characterized by strong curvature;
exceptional tightness of the joints between tubing products;
wear resistance and the ability to withstand even significant mechanical stress;
high strength of both the manufacturing material and the product itself.

Subs for drill string and tubing

First of all, casing is installed and secured into the well with cement, and only then the pump and compressor pipes. To perform this operation, special fixing elements called packers are used.

The length of individual pipes used to transport gas and liquid from a well can be up to 11.5 meters, and couplings are used to connect them to each other, ensuring the tightness of the joint and its reliability.

Tubing differs in the diameter of its cross-section; this parameter can range from 50.8 to 139.7 mm (2–5.5 inches).

Pipes for transporting liquids and gases from wells are classified according to various parameters. One of these parameters is the type of pumped fluid, depending on which tubing can be used in wells:

gas and water injection type;
for transportation of heavy oil (bitumen) from the productive zone;
gas producers;
oil

Enterprises that produce pumping and compressor pipes are guided by the requirements of GOST 633-80, according to which such products are divided into three types.

Smooth coupling products, the threads of which have a conical type and a triangular thread profile. Tubing of this type is characterized by increased cold resistance and ductility.
Smooth products, the design of which is complemented by a sealing unit made of plastic.
Coupling-type products, the conical threads of which have a trapezoidal profile. Tubing of this type is characterized by high tightness.
Smooth coupling products, the threads of which have a conical type and a triangular profile.

In different countries there are analogues of this GOST, according to which pipes are divided into the same types. In particular, in the USA and a number of other countries such a regulatory document is the API 5CT standard.

Features of installation and operation of columns from tubing pipes

A notable feature of pipes for transporting liquids and gases from the productive zone is that during operation they can be repeatedly (2-3 times) removed from the well, as well as carried out repairs and maintenance.

This feature must be taken into account when designing tubing columns, which are formed from several pipes connected to each other by means of sealed couplings.

Specialists performing such design must take into account the fact that the columns must be installed efficiently, quickly and safely and also removed from the well, and be able to be installed back if necessary.

Types of tees and elbows for tubing

If necessary, several columns can be installed in one production well, but experts try to limit themselves to a maximum of two tubing columns. Of greater importance for designers is the ability to equip a well with pipes that can be used for as long as possible without labor costs for repairs or replacement.

An important feature of columns made from tubing pipes is the ability to use them not only for their intended purpose, but also to solve a number of other problems. Thus, tubing combined into a string and placed in a production well allows solving the following important problems:

carrying out acid work, detecting an aquifer, performing testing activities, measuring pressure in the well;
perforation of the productive horizon;
reducing the risk of increasing pressure in the annular space formed by the outer walls of the tubing and the internal walls of the casing (with a sharp increase in such pressure, the tubing string ensures release of the blowout to the well surface).

Based on the purpose of tubing columns, a number of requirements are placed on them. So, they should:

have high strength and withstand significant tensile loads;
provide the required characteristics of liquid or gas flow;
can withstand loads well when performing various types of work (acid treatments, hydraulic fracturing operations, etc.);
maintain the required pressure of a liquid or gas when transporting it through a pipeline;
have high erosion and corrosion resistance throughout the entire life of the well;
be equipped with couplings that can withstand compression and tension loads for a long time, eliminating the risk of leaks.

Compliance with these conditions allows you to extend the service life of the columns to 20 years and eliminates the labor-intensive work of removing it from the well.

Some features of the production of tubing pipes and their acceptance tests

Various materials can be used to produce pipes used to transport liquids and gases from production wells.

Fiberglass

Pump and compressor pipes made of this material are used to equip disposal and injection type wells. As a rule, electric centrifugal pumps (ESP) are used in combination with such tubing.

Steel

The most common steel grades used for the production of tubing pipes are 30ХМА, 30, 20. If finished steel pipes intended for use in wells have even the slightest deviation from GOST requirements, they are sent for remelting.

Alloys containing aluminum

The use of this metal in tubing pipes provides them with high resistance to corrosion, including hydrogen sulfide, and can significantly reduce the weight of the entire structure.

Regardless of what material the tubing pipes are made of, many manufacturers additionally apply special protective coatings to their internal walls.

Special varnishes, epoxy resins and liquid glass can be used as such coatings, which can significantly increase the service life of pipelines and protect them from deposits on the walls.

The use of protective coatings for tubing pipes is an economically feasible solution, which results in reduced operating costs as well as repair costs. Considering the fact that stainless steel is not used for the production of tubing pipes, the use of special coatings is the only option for protecting well pipelines.

Reception walkways for tubing pipes

To ensure that tubing pipes fully meet their intended purpose, their characteristics are carefully controlled at all stages of production. In particular, the following parameters are checked:

resistance to sulfide corrosion cracking;
hardness;
tensile strength;
water resistance;
impact strength of the manufacturing material.

It is important that the pipe can be approved for use only if it meets all the requirements for it. Otherwise, the finished product is sent for processing.

How to properly operate tubing

When using tubing pipes, not only the requirements for their characteristics, but also the conditions for their transportation, storage and installation must be strictly observed. There are a number of generally accepted rules here.

In the event that pipes need to be stored for some time before use, a special area should be prepared for this. Thus, pumping and compression pipes cannot be stored on the ground - they must be laid on wooden blocks and ensure that the products do not sag under their own weight.

To transport tubing pipes, you must use only specially designed transport (pipe trucks). Under no circumstances should tubing pipes be transported by dragging.
In the event that it is necessary to unscrew a stubborn coupling from a tubing pipe, the threaded connection must not be subjected to shock loads. To do this, you can use special liquids or thoroughly clean the threaded connection from dirt.
When transporting and storing pipes, their threaded ends should be protected using special safety rings.

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Even when removing already used pipes from the well, they should be handled very carefully and stored on pre-laid wooden blocks.

Source: http://met-all.org/metalloprokat/truboprokat/proizvodstvo-i-ekspluatatsiya-trub-nkt.html

What is tubing pipe

Pipelines are the main components of many industrial lines and mechanisms. There are special requirements for the quality of these products, since they can be used both in everyday life and in the oil industry.

Among all this diversity, tubing pipes should be highlighted. You can learn more about the technical characteristics of these products here.

Basic Concepts

Tubing (tubing) are special fittings that are used in the oil and gas industry. Their main purpose is to transport gas and liquid substances. Sometimes they are also used in the repair of similar equipment.

Pipes constantly interact with various aggressive substances, which leads to their rapid destruction. Several types of steel are used as the main material for the production of this product:

Threaded connections must be coated with special lubricants, which helps prevent corrosion. Operation of the tubing requires the implementation of several recommendations:

Pipes are prohibited from being transported by weight to prevent deformation.
At the construction site, the products are placed on wooden supports, and protective rings must be present at their ends.
Collecting dirty pipes is prohibited.

Tubing classification

Pipes are divided according to several criteria, among which are the connection method:

Couplingless pipes (NCP). Such structures are capable of ensuring tightness at a pressure of no more than 50 MPa. They are connected using a special conical seal and trapezoidal thread.
Coupled pipes (NKM). The level of pressure they can provide also does not exceed 50 MPa. In this case, the strength of the joints is 90% of the total value.

Depending on the type of coating, these products can be divided into the following groups:

Tubing made of aluminum alloys. The products are resistant to hydrogen sulfide and are less susceptible to corrosion. They are characterized by high strength with relatively low weight.
Pipes with protective coating. Such products are used in places where it is necessary to prevent the appearance of deposits of paraffin, various salts and gypsum. Liquid glass, enamels, epoxy resins or special varnishes are used as protective substances.

Tubing pipes are unique designs that allow for the optimal level of transportation of petroleum products.

Source: http://www.stroim-2014.ru/chto-takoe-nkt-truby/

Tubing pipes (tubing) and their purpose

The pump and compressor pipeline is a highly durable system that is resistant to aggressive influences and damage. This is due to the fact that tubing pipes are made of heavy-duty steel or aluminum alloy.

They are mainly used for transporting gases and liquids, for pumping water, and for organizing pile foundations (pipes with a diameter of 89 mm or more are used). The good technical characteristics of such pipes are one of the reasons for their widespread use.

Application of tubing pipeline

Improved characteristics and properties of compressor pipelines are associated with their manufacturing technology. The tubing pipe has no seams, it is monolithic, due to which the complete tightness of the pipeline is maintained.

Such products belong to pipelines for a wide range of purposes. Compressor pipes are used for:

completion of gas wells;
organization of oil wells;
as structures for the extraction of heavy oil products;
as structures for injection wells;
organization of a pile foundation (if the pipe sizes correspond to 89, 102, 114 mm).

Classification and characteristics

Depending on the method of connecting pipeline segments, compressor pipes are divided into:

products with smooth ends (made of stainless steel of strength categories E, M, L, K, and can be supplemented with steel couplings for pipeline assembly);
products with ends set outside (equipped with an external thread and one coupling, made of steel categories D, L, M, E, K).

Pump and compressor pipes have modifications (types) that depend on the scope of application of the products. These types include:

Clutchless products (NCB). Their main purpose is to ensure the tightness of joints at a pressure of no more than 50 MPa. Structurally, they are equipped with ends with outward landing, as well as conical seals, which increase the waterproofing properties of the pipeline. Trapezoidal threads are used to connect the joints of pipeline elements. They can be used in country house construction if the diameter of the products is 89 mm or more.
Coupling products (NKM). They also withstand pressure up to 50 MPa while maintaining waterproofing properties. The body strength of such elements reaches 90%. For the most reliable connection, the products are equipped with trapezoidal threads.
Tubing pipes
Compressor aluminum pipes. They are made of aluminum alloy, which increases their resistance to alkaline and acidic environments and corrosion. Pipelines of this type have maximum specific strength indicators - 2.5 times more than others. Thanks to this, it is possible to create highways whose dimensions are 2.5 times longer. To organize them, products with a diameter of 89 mm or more are used.
Pump and compressor pipeline with special coating (liquid glass, varnish, epoxy, enamel). The special coating serves as a protective layer against gypsum, paraffin, and salt deposits. Their use is justified in areas where it is difficult to carry out repairs, since the protective layer extends the service life of the line.
Fiberglass tubing. The purpose of such products is to use them in injection, production or disposal wells.

Based on the classification, such pipes not only have different weights and sizes, they are also made from various materials, not limited to stainless steel.

Tubing dimensions are standardized by GOST; according to it, the diameter of steel pipes can vary from 27 to 114 mm (in conventional construction, pipes with a diameter of 89-114 mm are most often used) with a wall thickness of 3-7 cm. The length of steel segments cannot exceed 11.5 m.

Product advantages

Good performance properties give advantages to pump and compressor pipelines. These benefits include:

Coupling for connecting tubing pipes

High tightness of joints - waterproofing is maintained even at a pressure of 50 atm.
Wear resistance - resistance to destruction is due to both the mechanical and chemical strength of the material. During tubing production, they are tested for resistance to corrosion debonding. Therefore, they are used for installation where frequent repairs are not possible.
High permeability – cross-sectional permeability is maintained not only on straight sections, but also on bends of the pipeline.
Resistant to aggressive environments (acidic, alkaline, etc.), so they do not require frequent repairs or cleaning.

The disadvantages of such products include their heavy weight, which complicates transportation and installation of communications. The complexity of installation is also associated with the material, which is difficult to process to create the wiring of the desired configuration. Repairs involving the replacement of individual elements of the system are also difficult.

Specifics of pipeline tubing operation

When installing pumping and compressor products, general rules must be taken into account. These rules include:

During loading and unloading operations, a crane is used (even if pipes with a diameter of 89 mm are used to organize a pile foundation in country house construction).
When transporting tubing, mechanized pipe carriers are used (it is prohibited for them to sag).
When laying products, safety rings are put on the threaded elements of the pipe so that thread repair is not required, and then they are placed on wooden blocks.
When assessing the condition of the pipeline, a template is used. Such a device should have a smaller diameter (approximately 3 mm) than that of the pipe. The template is passed through the entire body of the pipeline, checking its integrity.
When screwing together elements, it is necessary to treat the coupling and nipple with a metal brush, then apply lubricant to the threads.
It is prohibited to use blows or mechanically influence the coupling to facilitate pipeline make-up, otherwise thread repair may be required.

Source: http://HomeBuild2.ru/truby/ntk-nasosno-kompressornye.html

Pump and compressor pipes and their purpose

Full functioning of wells in oil and gas fields is impossible without the use of tubing, which is the subject of this article.

Tubing pipes in storage

Release and marking of tubing pipes

Tubing is the main load-bearing element of pipelines in various industries. Due to their purpose and increased performance requirements, these products must meet the necessary safety standards and be labeled accordingly.

To ensure the strength of the product, it, together with connecting couplings, is made of durable steel grades D, E, K, L, M. Such grades of steel tubing pipes are more expensive than lower-quality analogues, but their use helps to provide the necessary for long pipelines operating in different climatic conditions .

The production of such pipes in Russia is carried out in accordance with GOST 633-80, which provides for the production of the following types of pump and compressor pipes:

Standard tubing produced with couplings for connection.
NKM is a brand of products for creating pipeline sections with increased tightness.
NKT-V – pipes with threads placed outside.
NKB is a type of pump and compressor pipes without couplings.

Production is allowed in accordance with specifications (technical conditions), with the following characteristics of tubing pipes:

Source: https://morflot.su/nasosno-kompressornye-truby-i-ih-naznachenie/

Tubing pipe: what are pump-compressor pipes, characteristics, steel grade, diameter, length

The abbreviation “NKT” is well known to oil and gas industry specialists. This is a short designation for pump and compressor pipes (this is how it stands for). They serve as a basic element for organizing the operation of wells. This concept is also relevant for aviation, where special requirements are imposed on the production of equipment.

The operating conditions in which these products are used are close to extreme. They undergo enormous operational loads. The very principle of well operation is based on constant contact with a chemically aggressive environment.

Oil Country Drill Pipe

Accordingly, special requirements are imposed on the quality of these products:

high degree of permeability (including in sections of wells with curvature);
absolute tightness at the ends (at joints);
quick release coupling (QR);
resistance to mechanical load;
resistance to abrasion and corrosion;
preventing oxidation of the transported medium;
wear resistance;
immunity to changes in temperature;
impeccable quality of workmanship.

Finally, the product must be flexible. This will ensure that the basic operating parameters (integrity, tightness, geometric proportions) are observed when the level of heating or pressure inside the system changes.

Tubing characteristics

As already mentioned, tubing is designed to work in particularly difficult conditions. Therefore, for the entire period of operation of the products, such incidents as the formation of delaminations and cracks or loss of pipe integrity must be excluded. In addition, the well itself must be designed as high quality as possible, which will also extend the uninterrupted service life of the industrial complex.

In accordance with all the features of the use of pipes, we can highlight the main requirements for them:

lack of tendency to corrosion;
wear resistance;
tightness along the entire length of the product;
smoothness of the inner surface.

Based on the presence of threads, manufactured products are divided into:

products with smooth ends;
pipes with external thread.

Pipes of the second type provide better sealing of the pipeline. An anti-corrosion sealing lubricant is applied to the external threads during the manufacturing process. The ends of the pipes are connected with specific wear-resistant couplings. Since, depending on the purpose of the pipeline, the pressure in the pipes can reach 50 MPa, high-reliability trapezoidal threads are applied to connect structural elements.

Types and classification of pump and compressor pipes (Assortment)

The classification is based on various parameters.

By tightness:

couplingless;
with threads for couplings (guarantee improved sealing).

Based on the type of medium being lifted to the surface (pumped out), nct groups are divided for operation in different wells:

oil;
gas producers;
pumping;
bituminous (in areas of the heavy oil zone).

Recycling wells (reserve) are included in a special category.

Classification according to GOST 633-80 implies the following groups:

Tubing - with a coupling connection (standard version). The task is to ensure total tightness of the system under conditions of 50 MPa.
NKT-V - with external (upset) thread. Required to organize the movement of gas and liquid media in the column. It provides standard functionality: lifting, debugging or lowering operations.
NKB - with external connecting thread. NKT B is intended for the formation of a coupling-free main line.
NCM - for the most difficult areas. Couplings with increased requirements for tightness are used as connecting elements.

Since this product plays the role of communications in the completion of individual wells and large-scale highways, it is particularly durable. To produce smooth workpieces and couplings, steel grades are used: D, E, K, L and M.

Table 2. Assortment

Weight, dimensions, weight, production and operating conditions are determined by GOST.

Tubing compliance parameters

optimal flow supply;
supply of maximum surface flow pressure;
corrosion resistance throughout the entire life of the well;
erosion potential throughout the life of the well;
withstanding the loads obtained as a result of stimulation work;
high tensile strength.

When designing and selecting tubing, the following factors must be taken into account:

Source: https://instanko.ru/osnastka/truba-nkt.html