A method for repairing pump and compressor pipes. Improving the technological process for repairing pumping and compressor pipes at the enterprise Safety protection devices

The invention relates to the field of mining, namely to the technique and technology for restoring worn-out steel pump and compressor pipes (BU tubing). Technical result is to increase the corrosion resistance and load-bearing capacity of repaired pipes due to their lining. The method includes radiation monitoring, cleaning the outer and inner surfaces of pipes from deposits and contaminants, visual and instrumental quality control, cutting and quality control of threads, hydraulic pressure testing, screwing on couplings and safety parts, marking and packaging of pipes in bags. A feature of the invention is that a thin-walled electric-welded pipe - liner, with adhesive-sealant previously applied to its outer surface, is introduced into the internal cavity of the pipe intended for repair, and then they are subjected to joint drawing in the distribution mode by pulling the mandrel through the internal cavity of the liner. 1 table

The invention relates to the field of repair of products made of steels and alloys that have been in service, namely to the technique and technology for restoring worn-out steel tubing pipes.

During operation, tubing is subject to corrosive and erosive wear, as well as mechanical abrasion. As a result of the impact of these factors on the tubing, various defects are formed on their outer and especially inner surfaces, including pitting, cavities, risks, scuffs, etc., which lead to loss of the bearing capacity of the pipes, so their further use for their intended purpose is without appropriate repairs are not possible. In some cases, tubing repair using existing methods does not give a positive result due to the large size of the defects.

The closest technical solution to the proposed invention is a method for repairing pumping and compressor pipes, developed by OAO Tatneft, set out, for example, in the “Regulations on the procedure for quality control, restoration and rejection of pumping and compressor pipes”.

This method is widely used in all oil companies in Russia.

The known method of tubing repair establishes a certain procedure for performing technological operations of restoration repair and technical requirements for the quality of used tubing (used tubing) and subject to repair. Restoration repairs are carried out in the following sequence: radiation inspection of pipes; cleaning their internal and external surfaces from asphalt, salt, paraffin deposits (ASPD), corrosion products and other contaminants; visual control; template; flaw detection by physical methods; cutting and quality control of threads at the ends of pipes (if necessary); screwing on couplings; pipe length measurement; hydraulic pressure test; marking; packaging and shipping of pipes to consumers. The basic technical requirements for the quality of pipes that have been in service and sent for repair establish standards for the curvature of pipes and restrictions for their general and local wear. Defects and defects of the drilling tubing should be no more than those that ensure the minimum residual pipe wall thickness indicated in Table 1.

If there are unacceptable defects on the surface of individual sections of the pipe with dimensions exceeding the permissible ones, then such sections of the pipe are cut out, but the length of the remaining part of the pipe must be at least 5.5 m.

The disadvantages of this method of tubing repair are:

Significant limitation of the volumes of drilling tubing sent for refurbishment due to the presence of unacceptable defects;

The need to cut off parts of the tubing with unacceptable defects (such pipes or parts of pipes are disposed of as scrap metal);

Reduced service life of repaired drilling tubing compared to new tubing.

The objective of the proposed technical solution is to increase the corrosion resistance and load-bearing capacity of worn-out tubing pipes by lining them, which will increase the volume of repairable pipes and use them for their intended purpose instead of purchasing and using new tubing. Currently, Russian oil companies annually send about 200 thousand tons of pipes to replace worn-out pump and compressor pipes.

The problem is solved by the fact that the proposed method includes manufacturing a liner (pipe) according to special technical conditions, applying a sealing material to the outer surface of the liner and the inner surface of the BU tubing, introducing the liner into the BU tubing, distributing it, creating conditions for polymerization of the sealing material, mainly based on epoxy .

A welded or seamless pipe made of ferrous, non-ferrous metals or alloys with increased corrosion resistance is used as a liner. The outer diameter of the liner is determined by the formula D ln = D vn.nt - , where D ln is the outer diameter of the liner; D int.nkt - the actual inner diameter of the rig tubing, taking into account their actual wear; - annular gap between the inner diameter of the tubing rig and the outer diameter of the liner. The gap is determined based on practical experience of free insertion of the liner into the internal cavity of the tubing rig; as a rule, it ranges from 2-5 mm. The thickness of the liner wall is determined from technical feasibility its production with a minimum value and from the economic feasibility of its use.

Example 1. As indicated in the description of the prototype, to restore the drilling tubing, repairs are carried out in the following sequence: radiation monitoring; cleaning of pipes from ARPD, treatment; visual and instrumental quality control; processing of pipe ends with threading and screwing of couplings; hydraulic pressure test. Statistical analysis showed that up to 70% of drilling tubing can be restored using this repair method; the remaining pipes are recycled as scrap metal. BU tubing after repair showed that their operational life is 15-25% less than that of new tubing.

Example 2. BU tubing pipes that do not comply technical requirements regulated by existing technology (prototype) and indicated in Table 1, were repaired in the following sequence: radiation control; cleaning of pipes from ARPD, including shot blasting. Visual and instrumental monitoring revealed the presence of cavities, scuffs and worn parts on the inner surface, which brought the wall thickness of the rig tubing beyond the maximum permissible deviation. On the experimental tubing rigs, through holes with a diameter of 3 mm were drilled in different places along the length. Welded thin-walled pipes made of corrosion-resistant steel with an outer diameter of 48 mm and a wall thickness of 2.0 mm were used as a liner. A sealing material 2 mm thick was applied to the outer surface of the liner and the inner surface of the tubing unit. Sockets were made at the front and rear ends of the rig tubing by introducing a conical mandrel of the appropriate size and shape into the rig tubing. At one end of the liner, a bell was also made in such a way that the inner surface of the bell of the rear end of the tubing rig was tightly mated with the outer surface of the liner bell. The liner was inserted into the rig tubing with a gap between its outer diameter and the internal diameter of the rig tubing equal to about 2.0 mm. The tubing rig with the liner inserted into it was installed in the steady rests of the receiving table of the drawing mill. By pulling the mandrel through the internal cavity of the liner, joint deformation (expansion) of the liner and the rig tubing was carried out. The working cylindrical part of the mandrel was made in such a way that the outer diameter of the tubing rig after lining increased by 0.3-0.5% of its actual diameter before lining. Pulling the mandrel through the combined liner and tubing rig was carried out using a rod, at one end of which the mandrel was fixed, and the other end was installed in the grips of the pulling cart of the drawing mill. After distributing the liner and tubing from the drilling unit, polymerization of the sealing material was carried out at the workshop temperature. All pipes of the pilot batch passed internal pressure tests in accordance with GOST 633-80. Bench tests of the BU tubing after the specified repair showed an increase in operational life by 5.2 times compared to new tubing. The maintainability of the tubing rig increased compared to the prototype and amounted to 87.5%.

The technical result from the use of the claimed object is to increase the corrosion resistance and load-bearing capacity of worn-out drilling tubing, increasing the volume of restoration of drilling tubing by increasing their maintainability. The economic result is to reduce the cost of servicing oil wells by using drilled tubing after repair for its intended purpose instead of purchasing expensive new tubing, increasing the reliability and durability of bimetallic tubing by giving the pipes high corrosion resistance provided by the corrosion resistance of the liner material.

Preliminary research of available patent and scientific and technical literature on the Ural State Fund Technical University, Yekaterinburg showed that the set of essential features of the proposed invention is new and has not previously been used in practice, which allows us to conclude that the technical solution meets the criteria of “novelty” and “inventive step”, and we consider its industrial applicability appropriate and technically feasible, that follows from its full description.

CLAIM

A method for repairing used tubing and compressor pipes (BU tubing), including radiation monitoring, cleaning the outer and inner surfaces of pipes from deposits and contaminants, visual and instrumental quality control, cutting and quality control of threads, hydraulic pressure testing, screwing on couplings and safety parts , marking and packaging of pipes in bags, characterized in that a thin-walled electric-welded pipe - liner with adhesive-sealant previously applied to its outer surface is introduced into the internal cavity of the pipe intended for repair, and then they are subjected to joint drawing in the distribution mode by pulling the mandrel through the inner cavity of the liner.

The amount of equipment is determined by the volume of output. To perform operations according to paragraphs. 1, 2, 3, 4, 10, 11, 12, 13 (see table 3.6) automated equipment is provided.

The workshop is equipped with an automated transport and storage system that ensures the transportation of pipes between technological equipment and the creation of interoperational backlogs, as well as an automated computer system for recording the production of pipes "ASU-NKT" with the ability to carry out certification of pipes.

Let's look at the workshop equipment:

MECHANIZED PIPE WASHING LINE

Designed for cleaning and washing the internal and external surfaces of tubing before their repair and preparation for further operation.

Washing is carried out with high-pressure jets of working fluid, while the required quality of tubing washing is achieved without heating the working fluid, due to the high-speed dynamic effect of the jets. Water without chemical additives is used as the working fluid.

Tubing that has paraffin-oil contamination and salt deposits can be washed when the pipe channel is clogged up to 20% of the area.

Washing with an increased volume of contamination is allowed when the line productivity decreases.

The spent working fluid undergoes cleaning, renewal of composition and is again supplied to the washing chamber. Mechanized removal of contaminants is provided.

The line operates in automatic mode controlled by a programmable command controller.

Advantages:

- high productivity and the required quality of washing are achieved without heating the working fluid, saving energy costs;
- coagulation and sticking of removed contaminants does not occur, the costs of their disposal and equipment cleaning are reduced;
- the environmental conditions of the tubing cleaning process are improved by reducing the release of harmful vapors, aerosols and heat, which leads to improved working conditions for workers.

Specifications:

Diameter of processed tubing, mm 60.3; 73; 89

Length of processed tubing, m 5.5 ... 10.5

Number of simultaneously washable tubing, pcs. 2

Pressure of washing liquid, MPa up to 25

High pressure pumps:

- anti-corrosion design with ceramic plungers
- number of workers 2 pcs.
- quantity of reserve 1 pc.
- pump capacity, m 3 /hour 10

Material of washing nozzles: hard alloy

Power consumption, kW 210

Capacity of settling and supply tanks, m 3 50

Overall dimensions, mm 42150 Х 6780 Х 2900

Weight, kg 37000

PIPE DRYING CHAMBER

Designed for drying tubing entering the chamber after washing or hydrotesting.

Drying is carried out with hot air supplied under pressure from the end of the pipe, passing along the entire length, followed by recirculation and partial purification of water vapor.

The temperature is maintained automatically.

Specifications:

Productivity, pipes/hour up to 30

Drying temperature, °C 50 ... 60; Drying time, min 15

Heater heater power, kW 60, 90

Amount of exhaust air, m 3 /hour 1000

Amount of recirculated air, m 3 /hour 5000

Characteristics of tubing

- outer diameter, mm 60, 73, 89
- length, mm 5500 ... 10500

Overall dimensions, mm 11830 H 1800 H 2010

Weight, kg 3150

INSTALLATION OF MECHANICAL PIPE CLEANING

Designed for mechanical cleaning of the inner surface of the tubing from random solid deposits that were not removed during pipe washing, during their repair and restoration.

Cleaning is carried out with a special tool (spring-loaded scraper), inserted on a rod into the channel of the rotating pipe, while simultaneously blowing with compressed air. Suction of processed products is provided.

Specifications:

Diameter of processed tubing, mm

- external 60.3; 73; 89

Length of processed tubing, m 5.5 - 10.5

Number of simultaneously processed tubing, pcs. 2 (with any combination of pipe lengths)

Tool feed speed, m/min 4.5

Pipe rotation speed (Zh73mm), min-1 55

Compressed air pressure, MPa 0.5 ... 0.6

Air consumption for pipe blowing, l/min 2000

Total power, kW 2.6

Overall dimensions, mm 23900 Х 900 Х 2900

Weight, kg 5400

INSTALLING PATTERNING

Designed to control the internal diameter and curvature of tubing during their repair and restoration.

Control is carried out by passing a control mandrel with dimensions in accordance with GOST 633-80, inserted on a rod into the pipe hole. The installation operates automatically.

Specifications:

Installation capacity, pipes/hour up to 30

Diameter of controlled tubing, mm

- external 60.3; 73; 89
- internal 50.3; 59; 62; 75.9

Length of controlled tubing, m 5.5 - 10.5

Outer diameter of templates (according to GOST 633-80), mm 48.15; 59.85; 56.85; 72.95

Template pushing force, N 100 - 600

Template movement speed, m/min 21

Travel drive power, kW 0.75

Overall dimensions, mm 24800 Х 600 Х 1200

Weight, kg 3000

AUTOMATED DEFECTOSCOPY LINE

Designed for non-destructive testing by electromagnetic method of tubing with couplings during repair and restoration, with their sorting by strength groups. Control is carried out by a programmable command controller. The line includes a flaw detection unit "URAN-2000M". pumping compressor pipe repair

Compared to existing equipment, the line has a number of advantages.

In automatic mode the following is carried out:

- the most comprehensive flaw detection and quality control of pipes and couplings;
- sorting and selection by strength groups of tubing and couplings;
- obtaining reliable quality indicators of both domestic and imported tubing through the use of a device for determining the chemical composition of the material in the control system;
- determination of the boundaries of defective sections of the pipe.

Specifications:

Line capacity, pipes/hour up to 30

Diameter of controlled tubing, mm 60.3; 73; 89

Length of controlled tubing, m 5.5 ... 10.5

Number of control positions 4

Tubing speed, m/min 20

Compressed air pressure in the pneumatic system, MPa 0.5 - 0.6

Total power, kW 8

Overall dimensions, mm 41500 Х 1450 Х 2400

Weight, kg 11700

Controlled parameters:

- continuity of the pipe wall;
- strength groups of pipes and couplings ("D", "K", "E"), determination of the chemical composition of the material;
- thickness measurement of the pipe wall according to GOST 633-80.

Marking is carried out with paint and varnish material according to the information on the monitor of the flaw detection installation.

Control data can be transferred to an automatic system for recording the release and certification of pipes.

INSTALLATION OF Flaw Scanning of PUMPING COMPRESSOR PIPES AND COUPLINGS "URAN-2000M"

The installation operates as part of an automated flaw detection line and is designed to check the quality of tubing according to the following indicators:

- presence of continuity violations;
- control of pipe wall thickness;
- sorting by strength groups “D”, “K”, “E” of pipes and couplings.

Installation composition:

- Measuring controller;
- Controller’s desktop;
- Pipe strength group control sensor; control panel and indication
- Sensor for monitoring the coupling strength group; (monitor);
- Set of flaw detection sensors;

- Display device monitor;
- Set of thickness gauges;
- Software;
- Signal processing unit;
- A set of working samples;
- Display device controller;

The installation operates in the following modes:

Monitoring of continuity violations (flaw detection) according to GOST 633-80;

Control of pipe wall thickness according to GOST 633-80;

Control chemical composition couplings and pipes;

Control of the strength group of the coupling and tubing according to GOST 633-80;

Output of results to an indication device with the ability to print;

Technical specifications:

Control speed, m/sec 0.4

Installation capacity, pipes/hour 40

Characteristics of pipes being repaired, mm

Diameter 60.3; 73; 89; length 5500 ... 10500

General technical characteristics:

Basic processors of the controller are 486 DХ4-100 and Pentium 100;

Random access memory (RAM) - 16 MB;

Floppy magnetic disk drive (FMD) - 3.5I, 1.44 MB;

Hard magnetic disk drive (HDD) - 1.2 GB;

Mains power alternating current frequency 50 Hz;

Voltage - 380/220 V; Power consumption - 2500 VA;

Continuous operation time - at least 20 hours;

Mean time between failures - at least 3000 hours;

Resistance to mechanical stress according to GOST 12997-76.

COUPLING MACHINE

The machine is designed for tightening and unscrewing smooth tubing couplings. Screwing is carried out with control of the specified torque (depending on the size of the pipe).

The machine is built into the turning section for tubing repair, but can be used autonomously if available Vehicle, providing loading and unloading of pipes.

The machine is controlled by a programmable command controller.

Advantages:

- constructive simplicity;
- simplicity and convenience of changeover to re-screwing modes or

unscrewing and pipe size;

Possibility of transporting pipes through the spindle and chuck.

Specifications:

Productivity, pipes/hour up to 40

Pipe diameter / outer diameter of couplings, mm 60/73; 73/89; 89/108

Spindle speed, min -1 10

Maximum torque, LFm 6000

Electromechanical spindle drive

Compressed air pressure, MPa 0.5 ... 0.6

Overall dimensions, mm 2740 × 1350 × 1650

Weight, kg 1660

HYDRAULIC TESTING INSTALLATION

Designed for testing by internal hydrostatic pressure the strength and tightness of tubing with screwed couplings during their repair and restoration.

The tightness of the tested cavity is carried out along the threads of the tubing and coupling. Work zone installations during testing are closed with lifting protective screens, which allows it to be integrated into production lines without a specialized box.

The installation operates automatically and is controlled by a programmable command controller.

Advantages:

- increased quality of control in accordance with GOST 633-80;
- reliable operation of the installation, provision is made for flushing the pipe channel from chip residues;
- reliable protection production staff with significant savings in production space.

Specifications:

Productivity, pipes/hour up to 30

Tubing diameter, mm 60.3; 73; 89

Tubing length, m 5.5 - 10.5

Test pressure, MPa up to 30

Working fluid water

Tubing holding time under pressure, sec. 10

Rotation speed of the plug and tubing during make-up, min-1 180

Estimated make-up torque LFm 100

Air pressure in the pneumatic system, MPa 0.5

Total power, kW 22

Overall dimensions, mm 17300 × 6200 × 3130

Weight, kg 10000

SETTING THE LENGTH MEASUREMENT

Designed to measure the length of tubing with couplings and obtain information on the number and total length of tubing when forming tubing packages after their repair.

The measurement is carried out using a moving carriage having a sensor and a displacement transducer.

The installation operates in automatic mode with control from a programmable command controller. Scheme for measuring pipe length according to GOST633-80;

Specifications:

Installation capacity, pipes/hour up to 30

Tubing outer diameter, mm 60.3; 73; 89

Tubing length, m 5.5 - 10.5

Measurement error, mm +5

Measurement resolution, mm 1

Carriage moving speed, m/min 18.75

Carriage movement drive power, W 90

Overall dimensions, mm 12100 Х 840 Х 2100

Weight, kg 1000

INSTALLATION OF STAMPING

Designed for marking tubing after repair.

The marking is applied to the open end of the pipe coupling using the method of sequential extrusion of marks. Contents of the marking (can be changed programmatically as desired): pipe serial number (3 digits), date (6 digits), pipe length in cm (4 digits), strength group (one of the letters D, K, E), company code (1 , 2 characters) and others at the user’s request (20 different characters in total).

The installation is built into pipe repair areas that have equipment for flaw detection and pipe length measurement, while information exchange and pipe marking are carried out automatically, using a programmable controller.

Advantages:

- provided a large number of information and good reading of it, including on pipes in stacks;
- good quality markings, because branding is performed on a mechanically treated surface;
- safety of markings during pipe operation;
- simple and repeated removal of old markings when repairing pipes;
- in comparison with markings on the pipe generatrix, the need to strip the pipe and the risk of microcracks are eliminated.

Specifications:

Productivity, pipes/hour up to 30

Tubing diameter according to GOST 633-80, mm 60, 73, 89; Tubing length, m up to 10.5

Font height according to GOST 26.008 - 85, mm 4

Print depth, mm 0.3 ... 0.5

Tool stamps carbide GOST 25726-83 with modification

Compressed air pressure, MPa 0.5 ... 0.6

Overall dimensions, mm 9800 × 960 × 1630; Weight, kg 2200

AUTOMATED PIPE ACCOUNTING SYSTEM FOR TUBE REPAIR SHOP

Designed for workshops with tubing repair production lines for operations using command controllers.

Using personal computers combined into local network with controllers, the following functions are performed:

- accounting of incoming tubing packages for repair;
- generation of shift-daily assignments for launching tubing packages into processing;

Current accounting of pipe passages for the most important flow operations, accounting of repairs...

Introduction

1. Analysis of the state of technical re-equipment of the workshop section for maintenance and repair of tubing

2. Technical part

2.1 Purpose, technical specifications tubing

2.2 Construction and application of tubing

2.3 Application of tubing

2.4 Typical tubing failures

2.5 Tubing strength calculation

2.6 Characteristics of the tubing maintenance and repair shop

2.7 Equipment of the tubing maintenance and repair workshop

2.8 Introduction of new equipment for tubing maintenance and repair

3. Economic part

3.1 Calculation of the economic effect of introducing new equipment

3.2 Calculation economic efficiency project

3.3 Market segmentation of this industry

3.3.1 Marketing strategy

3.3.2 Strategy for service development

4 Life safety

4.1 Harmful and hazardous factors production

4.2 Methods and means of protection from harmful and dangerous factors

4.3 Safety and labor protection instructions for workers in the tubing maintenance and repair shop

4.4 Calculation of lighting and ventilation

4.5 Environmental safety

4.6 Fire safety

5 Conclusion

6 References

annotation

In this diploma work An analysis of the production activities of the section for maintenance and repair of tubing at an oil engineering enterprise was carried out, in terms of describing the state of tubing repair, describing the marketing strategy for the development of this market segment, organizing the production process, developing tubing repair technology, choosing tools, modes processing, type of equipment, economic justification for introducing new equipment or technology, description safe conditions labor and environmental requirements. Measures have been developed to modernize the production process. All proposed measures are justified, the total economic effect that the enterprise will receive as a result of their implementation is calculated.

Introduction

Sooner or later in the life of any pump-compressor pipe (if it has not yet crumbled from corrosion) the day comes when its operation is no longer possible due to a narrowing of the internal diameter or partial destruction of the thread. Oil production companies are at the forefront of the fight against harmful tubing deposits and corrosion. Unable to influence the protective qualities of pipes already in operation, oil producing companies either send such pipes to scrap, or remove all deposits from the tubing and re-thread using special equipment as part of repair complexes.

Various options for equipping such workshops at the repair bases of oil producing companies are offered by several Russian enterprises - NPP Tekhmashkonstruktsiya (Samara), UralNITI (Ekaterinburg), Igrinsky Pipe-Mechanical Plant (Igra), etc.

There are 120 thousand wells in Russia, and pipes are not cleaned everywhere. In addition, no cleaning methods directly at the well can eliminate the gradual contamination of tubing with sediment.

Oil workers at repair bases operate up to 50 complexes for cleaning and repairing tubing - from the most primitive to the most advanced.

This diploma project is an educational document completed according to the curriculum at the final stage of higher education educational institution. This is an independent graduation complex qualifying work, the main goal and content of which is to design a section for the maintenance and repair of tubing at an oil engineering enterprise.

The work involves solving marketing, organizational, technical and economic issues, protecting environment and labor protection.

Also, the work sets the task of studying and solving scientific and technical problems that are of great industrial importance for the development modern technologies in the field of petroleum engineering.

In the process of working on a diploma project, the student must show maximum creative initiative and be responsible for the content, volume and form of the work performed.

The purpose of this diploma project is to develop a project for a section for the maintenance and repair of tubing at an oil engineering enterprise.

Project objectives include:

Description of the problem status;

Description of the marketing strategy for the development of this market segment;

Description of tubing design features;

Description of the production process, tubing repair technology, tools, equipment;

Development and economic justification a set of measures aimed at increasing the efficiency of the production process.

Descriptions of safe working conditions and environmental requirements

1. Analysis of the state of technical re-equipment of the workshop section for maintenance and repair of tubing

Protecting tubing from corrosion and harmful deposits of asphaltenes, resins and paraffins (ARP) dramatically increases their service life. This is best achieved by using coated pipes, but many oil producers prefer the “good old” metal, ignoring the successes of Russian innovators.

Unable to influence the protective qualities of pipes already in operation, oil producers use different ways removal of paraffin particles, primarily chemical (inhibition, dissolution) as the least expensive. At certain intervals, an acid solution is pumped into the annulus, which mixes with oil and removes new paraffin deposits on the inner surface of the tubing. Chemical cleaning also neutralizes the corrosive destructive effects of hydrogen sulfide on the pipe. Such an event does not interfere with oil production, and its composition after reaction with acid changes slightly.

Acid and other types of tubing treatment, of course, are used for their routine cleaning at the well, but to a limited extent - there are 120 thousand wells in Russia, and the pipes are far from being cleaned. In addition, no cleaning methods directly at the well can eliminate the gradual contamination of tubing with sediment.”

In addition to the chemical method of cleaning pipes, a mechanical method is sometimes used (with pigs lowered on a wire or rods). Other methods are dewaxing using wave action (acoustic, ultrasonic, explosive), electromagnetic and magnetic (exposure to magnetic fields on the fluid), thermal (heating the tubing with hot liquid or steam, electric current, thermochemical dewaxing) and hydraulic (fitting sections of pipelines to initiate gas phase separation - with special and hydro-jet devices) are used even less frequently due to their relative high cost.

Oil workers at repair bases operate up to 50 complexes for cleaning and repairing tubing - from the most primitive to very advanced, which means they are in demand. In case of severe contamination or damage to the tubing by corrosion (if the oil producing company does not have the appropriate equipment to restore them), the pipes are sent for repair to a specialized company. Pipes that do not meet the requirements technical specifications and those that do not have the appropriate parameters are rejected. Pipes suitable for repair are subjected to cutting off the threaded part, which wears the most. A new thread is cut, a new coupling is screwed on and marked. The recovered pipes are bundled and sent to the supplier.

Exist various technologies restoration and repair of tubing. The most modern technology includes tubing restoration and repair using the technology of applying a hard layer of a special anti-seize coating (EPC) to the thread.

Repair of tubing using NTS technology is carried out in accordance with (TU 1327-002-18908125-06) and ensures a reduction in the total costs of maintaining the tubing stock by 1.8 - 2 times due to:

Restoring the threads of 70% of pipes without cutting off the threaded ends and shortening the pipe body;

An increase of more than 10 times (guarantees of up to 40 STRs for stock tubing and over 150 STRs for process tubing, subject to compliance with RD 39-136-95) of the wear resistance life of the threads of repaired pipes compared to the thread life of new pipes;

Reducing the volume of purchases of new tubing by 2-3 times by increasing the service life of restored pipes and reducing waste from repair activities.

2.Technical part

2.1 Purpose, technical characteristics of tubing

Tubing is used during the operation of oil, gas, injection and water wells for transporting liquids and gases inside casing strings, as well as for repair and tripping operations.

Tubing pipes are connected to each other using coupling threaded connections.

Threaded connections of pump-compressor pipes provide:

Passability of columns in wellbores of complex profile, including in intervals of intense curvature;

Sufficient strength for all types of loads and the necessary tightness of connections of pipe columns;

Required wear resistance and maintainability.

Pump and compressor pipes are manufactured in the following designs and their combinations:

With ends set outward according to TU 14-161-150-94, TU 14-161-173-97, API 5ST;

Smooth, highly hermetic according to GOST 633-80, TU 14-161-150-94, TU 14-161-173-97;

Smooth with a sealing unit made of polymer material according to TU 14-3-1534-87;

Smooth, smooth, highly airtight with increased ductility and cold resistance according to TU 14-3-1588-88 and TU 14-3-1282-84;

Smooth, smooth, highly hermetic and with exposed ends, corrosion-resistant in active hydrogen sulfide-containing environments, having increased corrosion resistance during hydrochloric acid treatment and being cold-resistant to a temperature of minus 60 ° C according to TU 14-161-150-94, TU 14-161-173-97.

At the customer's request, pipes with a sealing unit made of polymer material can be manufactured with increased ductility and cold resistance. By agreement of the parties, pipes can be made corrosion-resistant for environments with low content hydrogen sulfide.

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A method for repairing pump and compressor pipes. Improving the technological process for repairing pumping and compressor pipes at the enterprise Safety protection devices

CLAIM

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