FIELD: oil and gas industry.
SUBSTANCE: invention is referred to tubing string having silicate enamel coating at inner surface. At outer surface of the string ends there is a tool for tubes connection made as threaded sections. At that according to the invention silicate enamel coating at inner surface of tubes is modelled at substrate. Substrate is formed with area having removed layer of metal surface with depth from 60 mcm up to 80 mcm. At that substrate length exceeds length of threaded section at outer surface of the tube 2.1-2.3 times.
EFFECT: increase of the string service life.
1 cl, 1 dwg
The invention relates to the field of oil production, in particular the design of pump-compressor pipes (tubing), which are used for oil extraction from wells.
Recently there has been a significant deterioration of operating conditions of downhole equipment. The main factors for this are the high content in the reservoir of liquid water and gas, the high salinity of the reservoir fluid, the high content of hydrogen sulfide, the presence of mechanical impurities, salts and paraffin. High aggressiveness of the reservoir fluid leads to intense corrosion submersible equipment and tubing and, as a result of the exit tubing failure. The latter leads to a significant decrease in oil production.
One of the ways to solve this problem is to protect the inner surface of the tubing.
Known bimetallic tubing, formed by two layers: the outer - hot rolled pipe, the inner pipe with anti-corrosive properties, and between them is placed a sealing material to ensure its polymerization (Patent RF 2344266, IPC F16L 9/18, 2009). This tubing has high strength characteristics, but it is complicated to manufacture, requires the use of an inner tube with anti-corrosive properties, which increases its value, however, the security problem, the persons of the NGOs in the area of the connection tubing, this design isn't resolved.
Known tubing having on the inner surface of the body polyurethane coating, and on the outer surface of the ends - means for connecting pipes between the threaded sections (RF Patent 2362942, F16L 58/02, 2009, and the Patent of the Russian Federation 2395666, EV 17/01, F16L 58/02, 2010). Data tubing are protected its inner surface from the high aggressiveness of the reservoir fluid, but not reliable. This is because the permeability of polyurethane coatings for corrosive environments is quite high, which starts subcortical corrosion of metal pipes, disrupt the adhesion of the coating to the metal and causing it to peel. The polyurethane coating has a coefficient of thermal expansion (CTE)that is substantially different from the CTE of the metal. The latter even with a slight fluctuations in the temperature of the transported medium in the direction of its increase leads to cracking of the coating and damage the tubing.
In addition, the polyurethane coating is characterized by low abrasion resistance, which also reduces the service life of the tubing.
Known tubing having on the inner surface of the body diffusion coating, and on the outer surface of the ends - means for connecting pipes between the threaded sections. The protective coating contains, wt%: is elesa 6-15, zinc 84,1-93,4, copper 0,4-6, aluminum of 0.2-0.3. The coating is produced by aging in the diffusion of the mixture during 1,0-3,0 hours at a temperature of 440°C and subsequent cooling in air (RF Patent 2284368, F16L 58/08, 2006). This tubing is characterized by corrosion resistance of the inner surface, but since the surface diffusion coating is not smooth and has no gloss, there are formed various mineral deposits of calcium carbonate, various sulfates, wax deposits, waxes, etc. in Addition, the diffusion protective coating like polyurethane, has a different KTR with metal pipes. This circumstance results in short lifetime of tubing with a change in temperature of the transported medium to loss of coating adhesion to the metal and, consequently, the delamination of the coating from the metal and as a result, corrosion of pipes and malfunction. At temperatures the same operation more tubing 70-80°C, the corrosion resistance of the coating drops sharply, because under the action of mineral salts transported medium, it begins to dissolve. Moreover, in the composition of the diffusion coatings is dominated by zinc, copper and aluminum. These components are gentle enough for abrasive inclusions that are transported in the environment, so that the floor is unstable to abrasive wear. All of the above Zn is considerably shorten the life of this tubing.
The closest analogues of is tubing having on the inner surface of the body silicate enamel coating, and on the outer surface of the ends - means for connecting pipes between the threaded sections (RF Patent 31256, EV 17/01, 2003). This design ensures thanks silicate enamel coating good cross aggressive reservoir fluid due to good adhesion and a smooth surface coverage, as well as good protection from the inside of the pipe body due to the proximity of CTE coating and metal, except for the end sections of the NKR. Indeed, when cutting the threaded sections, which is carried out after deposition of silicate enamel coating, and subsequent naveriani couplings with a force of 50-100 kg/m due to the compressive effort is the chipping of the coating with the end sections of the pipe, appear rough unprotected areas, leading to corrosion and output tubing failure.
The present invention is to improve the construction of the tubing by forming a special substrate under the coating on the inner surface of the pipe, resulting in increased service life of the pipe.
The problem is solved by the fact that in the pump-compressor pipe having on the inner surface of the body silicate-amale the second floor, and on the outer surface of the ends - means for connecting pipes in the form of threaded sections, according to the invention, the end sections of the pipe silicate enamel coating of the inner surface of the pipe is formed on the substrate formed by the area with the removed layer of the metal surface a depth of 60 μm to 80 μm, the length of the substrate is greater than the length of the threaded section on the outer surface of the pipe 2.1-2.3 times.
Declare the parameters obtained experimentally. In the process of selection of parameters of the substrate, it was found that when the exit offer its limits in the direction of decreasing was observed chipping of the coating when cutting the threaded sections and navorachivaya couplings, and the increase in the parameters leads to an increase in unnecessary costs to the production tubing.
The difference of the pipe from the closest of the analogues is executing on the body of the pipe, special substrates, characterized by the specified parameters.
The technical result from the application of the proposed tubing compared to the closest analogy is the increase of life, and consequently the achievement of the possibility of increasing oil production.
This is because the proposed special underlay can increase the reliability of the coating on the end parts and thus virtually the ski to achieve equality of life of the coating and the pipe body by increasing the adhesion of the coating to the metal end sections by providing a reaction between the coating and the metal in the zone of the substrate.
The drawing shows the proposed design of the tubing.
The inventive design of the tubing includes a metal pipe 1, having on the inner surface of the body silicate enamel coating 2 and on the outer surface of the ends - means for connecting pipes in the form of threaded sections 3, at end sections of the pipe silicate enamel coating 2 internal pipe surface is formed on the substrate 4 formed by the area with the removed layer of the metal surface depth h from 60 μm to 80 μm, the length of the substrate is greater than the length of the threaded section on the outer surface of the pipe 2.1-2.3 times.
Examples of specific performance tubing.
At the ends of seamless hot rolled steel tubes. GS 73 mm diameter with a wall thickness of 5.5 mm strength group E (GOST R-2004) was carried out of the substrate by removing a layer of metal on the end parts and a depth of 60 μm to 80 μm with a length of the substrate greater than the length of the threaded section on the outer surface of the pipe 2.1-2.3 times. To remove a layer used axial grinding machine with a diameter abrasive disc 50 mm, After which the pipe was subjected to blasting treatment and subsequent deposition on the inner surface of the mixture of silicate enamels ECT-2 TU 3.17-04637622-172-95 and ECT-7 according to TU U 23371749-005-96. After drying and firing the obtained smooth, reflective surface coating. Strength n the kick coverage end sections amounted to more than 10 j (10 j - the maximum limit of measurement-1A (GOST 4765-73)), while the rest of the inner surface it was 3-3,8 j.
It was made 1000 pieces of pipe have been successfully cutting threaded sections and navertyvanija couplings with the necessary force, and chipping silicate enamel coating was not observed across the length and end parts. The term columns of these tubing without repair for more than two years.
Tubing with a diameter of 73 mm and a wall thickness of 5.5 mm are manufactured according to GOST R-2004 are representatives in sortimente range, so when determining the parameters specified in the claims, were used in these pipes.
The results of determination of the parameters is given in Table 1.
|№ p/p||The geometric dimensions of the pipes according to GOST (diameter, wall thickness, mm||The number of pipe pieces||The wall thickness of the pipe end sections, mcm||The wall thickness of the pipe after processing sifma bus, mcm||The thickness of the removed layer of metal, mcm||The length of the zone of the substrate with the removed metal layer, μm||Quality is in the covering on the end parts after testing|
|1||73×5,5||83||5175||5102||72,4||143,6||Smooth, shiny, without cracks and chips|
|2||73×5,5||7||5469||5395||74,3||120||Radial fractures in the transition zone of the captured layer on the rough surface|
|3||73×5,5||9||5366||5314||52,6||140,9||Microcracks, point injections along the length of the zone|
|4||73×5,5||21||5365||5269||for 95.2||160,2||Smooth, shiny, without cracks and chips|
1. In the parameters table contains the averaged data.
2. The coating thickness was in the range of 260-320 μm (average of 290 μm), b is La similar for all options selection of the parameters of the substrate and provided rheological characteristics of the slurry.
In the process of selection of parameters of the substrate, it was found that when the exit offer its limits in the direction of decreasing was observed chipping of the coating when cutting the threaded sections and navorachivaya couplings, and the increase in the parameters leads to an increase in unnecessary costs to the production tubing.
The design of tubing made in accordance with the closest analogues due to corrosion of tubing on the end parts because of the radical chips, has failed already after 5-6 months.
Thus, the proposed design of the tubing is characterized by increased 4-5 times a lifetime.
Tubing, having on the inner surface of the silicate enamel coating, and on the outer surface of the ends - means for connecting pipes in the form of thread, characterized in that the end sections of the pipe silicate enamel coating of the inner surface of the pipe is formed on the substrate formed by the area with the removed layer of the metal surface a depth of 60 μm to 80 μm, the length of the substrate is greater than the length of the thread on the outer surface of the pipe 2.1-2.3 times.
SUBSTANCE: invention relates to pipeline construction and is used in field and basic conditions when laying underground main pipelines for protection thereof from corrosion, mechanical damage and during construction of gas or liquid transporting field and industrial pipelines in conditions of permanently frozen soil, when laying pipelines on swamps, on waterlogged areas, particularly for repairing anti-corrosion coatings of oil pipelines, oil product pipeline and gas pipelines during repair thereof in field conditions, including without stopping transportation of the product, and during corrosion protection of piping of compressor stations at pipeline temperature of 70-90°C, on a section of a pipeline transporting gas at temperature above zero after a compressor station, e.g. at a section of a discharge line transporting compressed gas at temperature of plus 40°C. Versions of anti-corrosion paint for obtaining an external polyurethane two-component protective coating are given. The paint is obtained by mixing component A and component B - polyisocyanate based on diphenyl methane diisocyanate with equivalent mass of 131-135. Component A is a suspension of substances in a hydroxyl-containing polyatomic alcohol with ether and ester bonds with equivalent mass of 230….250.
EFFECT: providing high rate of hardening of the coating with improved protective properties thereof, which prevents development of underfilm and stress corrosion on the pipeline for a period of time comparable with the life of the pipeline.
FIELD: machine building.
SUBSTANCE: method to repair pipes dismantled in process of pipeline repair and accepted suitable for repeated use, is carried out on a route under basic conditions using a complex of equipment for repair of pipes, in connected mobile modules of which pipes are cleaned from old insulation, the external surface of the pipes is prepared for application of a coating, the external surface of the pipes is insulated by application of a protective coating, while heating the external surface of pipes to speed up the process of protective coating polymerisation. Pipes are moved to the place of storage, at the same time works are carried out in a general flow, for this purpose each pipe is based on two trolleys. Depending on the nature of technological operations, each pipe is given a rotary movement using reciprocal motion of trolleys along a rail track, besides, ends of pipes at the length of at least 150 mm are protected against application of a coating.
EFFECT: method expands the arsenal of technical facilities, increases efficiency of a process for coating application under route conditions onto pipes, also of large diametres due to automation and synchronisation of efficiency of processes for preparation of external pipe surfaces and application of an insulating coating onto them.
FIELD: machine building.
SUBSTANCE: proposed method comprises contactless unearthing, removing damaged coating, pipe surface processing, applying new coating and burying repaired pipeline. Pipeline separate equal-length sections are unearthed while all process job time intervals are equal. Said removing damaged coating, pipe surface processing, and applying new coating are executed without contact between process equipment and pipeline surface and spark-forming mechanical contact of work tools.
EFFECT: repair without interrupting transfer of product, reduced repair interval.
FIELD: machine building.
SUBSTANCE: before insertion of sleeve inside pipe bandage of fibrous material is fixed on internal surface of pipe by means of metal band impregnated with solidificated binding. There is formed an open circular section of the bandage. A tube-like sleeve of fibrous material is inserted inside the pipe. The sleeve is impregnated with solidificated binding and is enclosed into a flexible casing of polymer material. Further, the sleeve is reversed and moved inside the pipe, is straightened and pressed to internal surface of the pipe due to pressure of water on internal surface of an inverted sleeve. The bandage is solidificated simultaneously with the sleeve.
EFFECT: reduced amount of air in space between internal surface of pipe and sleeve inserted into pipe; elimination of working fluid leakage between internal surface of pipe and external surface of solidificated sleeve coating.
FIELD: machine building.
SUBSTANCE: procedure for application of protective enamel on internal surface of pipe consists in preliminary surface cleaning, in application of enamel and in drying. Also, initially pipe is heated and dried by blowing air of t=+40÷80°C through it. Further, internal surface of the pipe is cleaned by an abrasive-jet method for elimination of impurities and obtaining roughness as high, as RZ 40, where upon dust is removed by air blowing. There are applied not less, than two layers of enamel. Each wet layer of enamel has thickness, as high as 90÷180 mcm. Each enamel layer is dried at flow rate 2÷8 m/sec by blowing air of temperature +15÷25°C through pipe during not less, than 3 hours. Interval between application of layers should last no more, than 24 hours. Here is also disclosed the procedure for control over application of a protective cover on internal surface of the pipe. A sample in form of a cylinder of length equal to 0.5-1.5 diametre of a pipe is cut out from the pipe with protective enamel applied on it as a coating. The sample is subjected to compression in a radial direction till coating fractures. Quality of protective coating is determined by a value of deformation of the sample at the moment of detection of this coating fracture.
EFFECT: simplified process, raised efficiency, reduced power input and upgraded quality of coating.
FIELD: machine building.
SUBSTANCE: installation for trenchless repair of pipelines consists of drum with cloth shell wound on it, of bath for impregnation of this shell with polymer composition, of hollow cantilever for laying cloth shell into film sleeve, and of pneumatic-mechanical gate with pressure gauges and valves arranged on it. The bath is equipped with freely rotating rollers and has a cover with an opening hatch for refilling polymer composition and with thermo-electric heaters for polymer composition controlled heating. In the cover from the side of the bath there are made two slits opposite to each other for input and output of the cloth shell. The bath, the cover and its hatch have heat insulation coating on external side.
EFFECT: impregnation of cloth shells with polymer composition at low ambient temperature and accelerated impregnation, increased efficiency of installation for trenchless repair of pipelines.
FIELD: machine building.
SUBSTANCE: input consists of band of fireproof material arranged on plastic tube and of a collar to fix band of fireproof material on plastic tube. The band of fireproof material and the collar only partially envelopes the plastic tube.
EFFECT: compact positioning of wall or ceiling input.
13 cl, 8 dwg
SUBSTANCE: threaded joint for pipes (the first version) comprises a rod (100) and a body (200) elements. The rod element has a thread adapted for matching with the body element. The thread shape and the rod and body elements shape are determined by the thread profile, where the thread surface has a coating. This coating contains the first layer (24) with high friction and antiscoring properties, applied onto the whole surface of the rod element (100), and the second layer (25) with low friction properties applied into separate parts of the surface of either only the rod element, or only the body element. The threaded joint for pipes (the second version) comprises a rod (100) and a body (200) elements. The rod element has a thread adapted for matching with the body element. The thread shape and the rod and body elements shape are determined by the thread profile, where the thread surface has a coating. This coating contains the first layer (24) with high friction and antiscoring properties, applied onto the whole surface of the body element (200), and the second layer (25) with low friction properties applied onto separate parts of the surface of either only the rod element, or only the body element.
EFFECT: increased efficiency of the structure operation, its resistance to corrosion.
48 cl, 12 dwg
FIELD: machine building.
SUBSTANCE: anti-corrosion coating is applied to inner pipe surface, bushes made from corrosion-resistant metal and having on outer surface the sealing layers in the form of elastic coating are installed inside ends of pipe with covering some part of coating and bushes are fixed by their expansion till they tightly touch inner pipe surface. Sealing layer can be made from elastic polymer material.
EFFECT: reducing labour intensity of production and reducing the cost of products.
6 cl, 3 dwg
FIELD: machine building.
SUBSTANCE: first, before welding end of pipeline, heat-shrinkage clutch-bushing is positioned on pipeline close to joint. Upon joint welding, insulated surface is cleaned with metal brushes and dried from moisture. Prime coating - "liquid" primer and mastic band corresponding to coating with 80…90 degrees C temperature of mastic material softening are applied on this surface. Further, the heat-shrinkage clutch-bushing is pushed to a zone of a welded joint symmetrically to it and is heated to temperature 110…120 degrees C. Simultaneously, layers of the mastic band are heated and melted through the heat-shrinkage clutch-bushing ensuring pressure onto melted mastic of the mastic band and filling interstices with it in a zone of welding joint strengthening (hemi-spherical zones) and places of transition to base coating and overlapped layers of the mastic band. Insulating coating of the welded joint of the pipeline contains prime coating- "liquid" primer, the mastic band made either in from of a polymer-bitumen with base out of polyvinylchloride with mastic of 80…90 degr. C of softening, or in form of a base-less material consisting of polymer-bitumen mastic with softening temperature 80-90 degrees C and glass mesh. Also insulating coating consists of the heat-shrinkage clutch enveloping the pipeline and made in form of a solid bushing out of a sheet of light- and heat stabilised one-layer polyethylene modified by radiation-chemical method. The clutch is installed on the pipeline before pipeline joint welding and can travel along axis of the pipeline.
EFFECT: raised efficiency of anti-corrosion protection due to increased resistance of insulation coating.
2 cl, 2 dwg
SUBSTANCE: tubes are made from steel containing the following components, wt %: carbon not more than 0.16, silicon 0.30-0.50, manganese 0.50-0.70, chrome 3.00-6.00, molybdenum 0.40-1.00, vanadium 0.04-0.10, niobium 0.04-0.10, aluminium 0.02-0.05, rare-earth metals 0.005-0.015, iron and inevitable impurities - the rest; flattening of tube wall is performed at temperature of 1050-900°C; cooling in the air after flattening is performed up to temperature of 700-650°C and reduction or calibration of diameter is performed at that temperature.
EFFECT: formation of steel structure which provides the stability of its characteristics throughout the length of manufactured tube.
3 tbl, 2 dwg
SUBSTANCE: invention relates to systems intended for medium transfer between two offshore devices and to method of communicating of said system. Proposed system comprises anchor (5) fixed at sea bottom (1), at least one first transfer vertical element (6) at least one flexible second transfer element (7) that continues aforesaid first element (6), swivel link (15) arranged between said first and second transfer elements to rotate in at least about lengthwise axis of the first transfer element. Free end of the second transfer element (7), in inoperative condition, hangs free in water depth. Lifting device for flexible transfer element (7) between first plant (4) and ship (3) comprises connectors for it to be connected to the ship and guide element (20) to slide along element (7), extracting rope (21) and at least one identification buoy (22). Method of connecting loading system comprises ship arrival to location of loading system, lifting said buoy aboard the ship, turning the ship from loading system, pulling off buoy extracting rope and free end of flexible transfer element towards the ship and joint said end to the ship.
EFFECT: operation at significant depths, no hindrance to sea traffic.
12 cl, 13 dwg
FIELD: oil and gas production.
SUBSTANCE: method for manufacturing a tubing string involves coating formation on its internal surface. The coating represents at least one polyurethane coating layer containing ureal groups with their mass fraction in the coating makes 6 to 14%. Total coating thickness is within the range 10 to 500 microns.
EFFECT: increased service durability of the tubing string ensure by more efficient deposit protection and abrasive, hydroabrasive and corrosive wear.
9 cl, 5 dwg
FIELD: oil and gas production.
SUBSTANCE: round-trip device comprises oil-well tubing, a pipe wrench pipe wrenchand a spider accommodating elements provided with both hardened profiled, and the smooth unhardened surfaces to interact. The invention provides designing of the hardened profiled elements on external surface patches of the oil-well tubing within interface with the oil-well tubing and spider which are provided by the elements with the smooth unhardened surfaces.
EFFECT: higher reliability of the current equipment by decreasing the probability of parting and dropping the various fragments of the round-trip device.
SUBSTANCE: there is obtained rod body and head in the form of all-metal structure by forging and proceeds in two stages. Head allows external clamp and "area for key". At the first stage it is received initial semi-finished product with reinforced part and formed "area for key". At the second stage it is implemented final formation of external clamp of head. The second stage is implemented at least at three sequential conversions at least in three final impressions. At the first conversion in the first impression there is introduced metallic technological ring into area of formed clamp. In the following impressions it is implemented final clamping of semi-finished product.
EFFECT: increasing of bearing capacity of pump rod.
FIELD: oil-and-gas production.
SUBSTANCE: invention related to oil-and-gas production can be used for tubing sting manufacture and repair. Process system for tubing string repair includes heating department, internal surface of repaired tubing string shot blasting department, linering preparation department, repaired tubing pipe and liner aligning department, linering department with lubricant use, washing out lubricant and drying department, linered pipe ends cutting and threading department, external surface of repaired tubing string shot blasting department, pipe internal surface coating department, heating of pipe internal coating hardening department, collar connection department. At linered pipe ends cutting and threading department also located department of liner ends welding to repairing tubing pipe ends and ends cleaning after welding. Linering preparation department equipped with department of liner coating with water proof material. Linered pipe heating department located after washing out lubricant and drying department or combined with heating of pipe internal coating hardening department. Area between departments equipped with intermediate storages, quality control departments, departments of preparation for the next process, loading-unloading mechanisms and transportation mechanisms.
EFFECT: increase in efficiency and repair quality of used tubing strings.
4 cl, 1 dwg
FIELD: oil-and-gas production.
SUBSTANCE: invention related to oil-and-gas production, can be used in tubing string manufacturing and maintenance. Tubing string maintenance method includes of external and internal pipe surfaces cleaning out of deposits and contamination, linering, ends cuttings, threading, fixing of sleeve and safety units. During external and internal pipe surfaces cleaning, pipe itseff heated up till deposits and contamination became fragile and possible to be destroyed with shot blasting, and internal surface shot blasted. After linering wash linered pipe, dry, shot blast its internal surface, cover internal surface with polymer and heat the pipe up till polymer coating is fixed. After lined pipe ends cut, execute liner ends and tubing string welding and cleaning. Before linering between liner and repaired pipe locate sealing material and after washing and drying heat up lined pipe till sealing material fixed or during internal surface coating heating.
EFFECT: resistance increase against asphalt paraffin deposits inside the well.
FIELD: oil and gas industry.
SUBSTANCE: invention refers to oil production equipment, particularly to methods of fabrication of pump bars. The method of fabrication of pump bars consists in heating ends of stock of round bar for punching heads of the pump bar, in punching heads of the pump bar, in heat treatment of the pump bar and in following shaping of the body of the pump bar in a hot state, in thread rolling of the pump bar, in rolling surface of a behind-thread groove and in strengthening a surface layer of the body of the pump bar. Strengthening of a surface layer of the body of the pump bar is carried out with cold-work hardening in a preliminary stressed state, which corresponds to a combination of overload reinforcement with cold-work hardening. Also the stock is stressed with load of the same direction, that a working load affecting the bar at operation.
EFFECT: increased operation life of bars due to raised fatigue-corrosion hardness of bar material.
SUBSTANCE: invention relates to devices for extraction of oil, gas and gas condensate from hole, particularly to pump-compressor pipe (PCP). On outside surface PCP it is applied coating, implemented in the form of evaporated layer, herewith coating includes: carbon (C), molybdenum (Mo), silicon (Si), nickel (Ni), copper (Cu), chrome (Cr), boron (B), manganese (Mn), aluminium oxide (Al2O3), iron (Fe), at following ratio of components, wt %: C - 1.3-5-2.0; Mo - 4.0-5.0; Si - 0.5-1.5; Ni -11-20; Cu - 0.01-0.50; Cr - 23-32; B - 0.001-0.1; Mn - 0.4-1.2; Al2O3- 0.1-5; Fe - the rest.
EFFECT: increasing of corrosion stability and wear resistance of PCP.
FIELD: oil and gas industry.
SUBSTANCE: invention is related to the field of pipes production from structural medium-carbon or low-alloyed steels, namely, to method of lifting pipes (LP) production, and may find application in oil and gas industry. Method comprises preparation of high-tensile hot rolled pipe and finishing processing. After production of hot rolled pipe, its internal surface is polished to metal shine and sealing material is applied on it. Then pipe with anticorrosion properties, external surface of which has been previously cleaned to metal shine, is inserted into internal cavity of hot rolled pipe, and sealing material is applied on it. Pipes are compressed together, providing their fixing due to elastic stresses that occur in process of deformation, and material is polymerised.
EFFECT: higher strength characteristics.
FIELD: oil industry.
SUBSTANCE: method, according to first variant, includes mounting limiting elements on flexible traction organ with marking of common holding portion on it with later displacement within its limits of functional elements and intermediate limiting elements with marking of local fixed portions between them for appropriate functional elements, which are positioned on them with possible of each their independent, of one relatively to other, reciprocal longitudinal movement and alternating effect by edges of each of them on edges of intermediate limiting elements. Difference of method according to second variant is that intermediate limiting elements are mounted with marking of, on each of them, of local fixed portions, combined with then and overlapping them by length, meant for appropriate functional elements with inner ring-shaped shelves on edges and alternating action by inner ring-shaped shelves with edges of one limiting element on it. Pumping bar according to first variant has flexible traction organ with limiting elements on it and intermediate limiting elements with fixed portions marked between them for appropriate functional elements, which are positioned therein with possibility of each their independent, one relatively to another, reciprocal longitudinal movement and alternating effect by ends of each of them on ends of intermediate limiting elements. Difference of bar according to second variant is that intermediate limiting elements are mounted with marking on each of them, of local fixed portions, combined with them and overlapping them by length, for appropriate functional elements positioned therein with inner ring-shaped shelves on ends and alternating effect by inner ring-shaped shelves on ends of one limiting element in it.
EFFECT: lower costs of well operation.
4 cl, 8 dwg