CN111503431A - Utilize interior thermal insulation pipeline subassembly of special coupling - Google Patents
Utilize interior thermal insulation pipeline subassembly of special coupling Download PDFInfo
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- CN111503431A CN111503431A CN202010403447.9A CN202010403447A CN111503431A CN 111503431 A CN111503431 A CN 111503431A CN 202010403447 A CN202010403447 A CN 202010403447A CN 111503431 A CN111503431 A CN 111503431A
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- 238000007789 sealing Methods 0.000 claims abstract description 73
- 238000012545 processing Methods 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 8
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- 239000002184 metal Substances 0.000 claims description 4
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
- F16L15/001—Screw-threaded joints; Forms of screw-threads for such joints with conical threads
- F16L15/002—Screw-threaded joints; Forms of screw-threads for such joints with conical threads with more then one threaded section
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
- F16L15/001—Screw-threaded joints; Forms of screw-threads for such joints with conical threads
- F16L15/003—Screw-threaded joints; Forms of screw-threads for such joints with conical threads with sealing rings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
- F16L57/06—Protection of pipes or objects of similar shape against external or internal damage or wear against wear
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/10—Coatings characterised by the materials used by rubber or plastics
- F16L58/1009—Coatings characterised by the materials used by rubber or plastics the coating being placed inside the pipe
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
- F16L59/028—Composition or method of fixing a thermally insulating material
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Thermal Insulation (AREA)
Abstract
The invention discloses an inner heat-insulation pipeline assembly utilizing a special coupling, and relates to the technical field of hot fluid and petroleum collection and conveying pipeline equipment. The invention can be used for solving the problems of sealing, positioning, fixing and using when the pipeline is used as an 'inner heat-insulating pipe' in the process of collecting hot fluid, has good heat-insulating effect and low cost, greatly improves the sealing performance of the inner core pipe by matching the coupling main body and the joint main body, completes the production process of the assembly in a factory, has basically the same operation process as the conventional oil pipe operation in the field operation of an oil field, is integrally detachable, is convenient for maintaining after the pipeline is processed, and is convenient for repeatedly using materials.
Description
Technical Field
The invention relates to the technical field of hot fluid and petroleum collection and conveying pipeline equipment, in particular to an inner heat-insulation pipeline assembly utilizing a special coupling.
Background
The conventional oil extraction method is rod pumping, i.e. steel oil pipe is connected by hoop, and the oil pipe is connected with oil pump at bottom of well by steel sucker rod, the temperature gradient at bottom of well is raised by 3 deg.C per 100 m, and the initial liquid temperature of 2000 m oil well is 60-80 deg.C.
Through the up-and-down reciprocating motion of the sucker rod, the liquid in the well is lifted to the ground, the temperature of the liquid in the pipe is gradually reduced due to the heat dissipation effect of the steel pipe in the process, wax in the liquid is gradually separated out, and the normal liquid outlet of an oil well can be influenced to a certain degree. In order to prevent the wax deposition and wax removal of the oil well, measures such as heating through a sucker rod, hot washing of the oil well, addition of chemical agents and the like are needed, and energy consumption, material consumption, time consumption, manpower consumption and expense are needed. Meanwhile, the sucker rod is drawn in the oil pipe, and the oil pipe or the sucker rod is easily abraded due to contact friction between the sucker rod and the oil pipe.
In order to solve the problem of wax deposition in the oil pumping pipe, people are constantly searching, and one method is to provide an insulating layer (called as an "inner insulating pipe") in the oil pipe so as to increase the temperature of liquid in the pipe, thereby slowing down or even avoiding wax deposition in the oil pipe. Similarly, in the process of collecting and transporting various hot fluids such as underground hot water, geothermal steam and heat-carrying gas which exist underground and have higher temperature than normal values, the same insulating layer structure is also needed to be adopted in the pipeline to improve the temperature of the fluid in the pipeline, in order to ensure that the inner insulating oil pipe can be repeatedly used and is convenient to inspect and maintain, after the small-caliber core pipe is placed into the conventional oil pipe, both ends of the small-caliber core pipe are required to be sealed and can be disassembled, the existing oil pipe coupling is shown as figure 5, and the structure of the existing oil pipe coupling can show that the traditional coupling and coupling mode does not have the functions of completely sealing, positioning and fixing the inner core pipe, and in the process of realizing the invention, the inventor finds that the connection combination of the inner insulating pipe and the pipeline in the prior art at least has the: firstly, the coupling connection mode of the pipeline can be changed after the 'inner heat-insulating pipe' is adopted, an operator is not suitable and needs to be retrained when the joint is connected, the operation method of assembly and subsequent oil well operation can possibly be changed, and the field construction quality is reduced; secondly, because of the problem of pipe machining precision, particularly when an old oil pipe is adopted, the size, the surface flatness and the roughness are difficult to control, the sealing effect is greatly influenced; because the sealing structure is generally arranged at two ends of an oil pipe or on a coupling, the sealing effect is also adversely affected due to the length change caused by thermal expansion and cold contraction and the possibility of angular displacement between an upper coupling and a lower coupling during the fastening operation of the oil pipe on an oil field site; finally, the existing common coupling has low sealing performance, corrosion resistance and reusability, and has high use cost and maintenance cost. Therefore, new ideas for solving the above problems are required.
Disclosure of Invention
The invention mainly aims to provide an inner heat-insulation pipeline assembly utilizing a special coupling, and aims to solve the problems of sealing, positioning, fixing and using when an 'inner heat-insulation pipe' is used in a pipeline in a hot fluid collecting process.
In order to achieve the above object, the present invention provides an inner insulation pipe assembly using a special coupling, the pipe assembly comprising a pipe main body, a coupling main body installed at an upper end of the pipe main body, a joint main body installed at a lower end of the pipe main body, and an inner core pipe installed inside the pipe main body, wherein a main insulation layer is disposed between the pipe main body and the inner core pipe;
the two ends of the inner core pipe are provided with raised step parts, the step parts are provided with sealing grooves, and the sealing grooves are provided with sealing rings;
the inner wall of the coupling main body is provided with pipeline connecting parts from the outside to the center, an extending part is arranged between the two pipeline connecting parts on the inner wall of the coupling main body, a positioning groove for fixing the inner core pipe and an upper sealing surface for sealing the end part of the inner core pipe are formed in the extending part, the extending part is downwards sunken near the pipeline connecting part adjacent to the extending part to form the positioning groove, a hole check ring is arranged in the positioning groove, and a step part at one end of the inner core pipe is arranged on the upper sealing surface;
an inner mounting part and a lower sealing surface are arranged from one side to the other side in the joint main body, an internal thread for being directly connected with the lower end of the pipeline main body is arranged on the inner mounting part, and a step part at the other end of the inner core pipe is arranged on the lower sealing surface; the outside of connecting the main part is provided with the external installation department, have the external screw thread on the external installation department.
Further, the lower sealing surface is arranged on one side of the inner mounting portion and extends to the end face inside the joint main body, the outer mounting portion extends to the end face on the same side of the upper sealing surface and the lower sealing surface of the joint main body, and the length of the outer mounting portion is smaller than that of the sealing surface.
Further, the materials of the coupling body and the joint body are made of metal materials with the steel grades of J55, K55, N80, L80 or P110.
Furthermore, the outer diameters of the coupling main body and the joint main body are in the size range of 30-300 mm, the inner diameters of the coupling main body and the joint main body are in the size range of 25-250 mm, and the wall thicknesses of the coupling main body and the joint main body are in the size range of 5-50 mm.
Furthermore, each step part is provided with two sealing grooves, and one sealing ring is installed in each sealing groove.
Further, the shape of the sealing ring adopts an O shape or a star shape.
Furthermore, the main insulating layer and the supplementary insulating layer are made of aerogel felt or bi-component polyurethane.
Furthermore, the step parts at the two ends of the inner core pipe are subjected to local upsetting and then are subjected to metal processing or are welded by adopting a welding part and then are subjected to metal processing treatment.
Further, a lining pipe is arranged inside the inner core pipe.
Furthermore, the lining pipe is made of an ultra-high molecular weight polyethylene pipe or heat-resistant polyethylene, and the technical scheme of the invention has the following beneficial effects:
(1) the technical scheme of the invention belongs to an 'internal heat insulation' structure, and has good heat insulation effect and low cost;
(2) the matching of the coupling main body and the joint main body with special structures is utilized, and the controllability of the dimensional precision and the roughness of the sealing part is good, so that the sealing performance of the inner core pipe with the inner heat insulation is greatly improved. If the coupling material with a special structure is made of stainless steel, the overall corrosion resistance and the reusability of the composite pipe fitting are improved;
(3) the structure without the lining pipe is suitable for rod-free oil pumping and geothermal wells;
(4) the adoption of the structure with the lining pipe not only focuses on heat preservation, but also considers the problems of eccentric wear prevention and corrosion prevention, so that the innermost layer of the composite pipe is lined with an ultra-high molecular weight polyethylene pipe and the like, and the composite pipe is more suitable for pumping oil with a rod, and certainly can be used in a rodless oil pumping well and a geothermal well, and the effect is more satisfactory;
(5) the heat insulation structure of the pipeline main body of the pipeline assembly, the inner core pipe and the lining pipe can be disassembled, so that the pipeline is convenient to maintain after being processed, and the materials are convenient to reuse;
(6) the main heat-insulating layer and the supplementary heat-insulating layer are matched for use, so that the heat-insulating effect is further improved.
(7) The production process of the pipeline assembly is completed in a factory, the operation process of the field operation in the oil field is basically the same as that of the conventional oil pipe operation, the conventional inspection of the oil pipe by the oil field is not influenced, and convenience is provided for the operation and the subsequent inspection of workers.
Drawings
FIG. 1 is a schematic structural diagram according to a first embodiment of the present invention;
FIG. 2 is a schematic structural diagram according to a second embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a collar body in an embodiment of the invention;
FIG. 4 is a schematic structural view of a connector body according to an embodiment of the present invention;
FIG. 5 is a schematic half-sectional view of a conventional coupling.
In the drawings, the components represented by the respective reference numerals are listed below:
1-a collar body; 11-a pipe connection; 12-an extension; 121-positioning grooves; 122 — an upper sealing surface; 123-positioning blocks; 2-a retainer ring for hole; 3-inner core tube; 31-a step portion; 311-sealing the trench; 4-sealing ring; 5-a pipe body; 6-main insulating layer; 7-supplement of an insulating layer; 8-a connector body; 81-inner mounting part; 82-lower sealing surface; 83-external mounting; 9-lining the tube.
Detailed Description
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.
Example one
As shown in fig. 1, a first embodiment of the present invention provides an internal thermal insulation pipeline assembly using a special coupling, which is used for pipeline application in a thermal fluid collection process, and includes a pipeline main body 5, a coupling main body 1 installed at an upper end of the pipeline main body 5, a joint main body 8 installed at a lower end of the pipeline main body 5, and an inner core pipe 3 installed inside the pipeline main body 5, wherein a main thermal insulation layer 6 is disposed between the pipeline main body 5 and the inner core pipe 3, raised step portions 31 are disposed at two ends of the inner core pipe 3, a sealing groove 311 is disposed on each step portion 31, a sealing ring 4 is installed on each sealing groove 311, preferably, each step portion 31 has two sealing grooves 311, and a sealing ring 4 is installed in each sealing groove 311.
In the first embodiment, the coupling body 1 is used for connecting the pipe bodies 5 used in the hot fluid collecting process and positioning and sealing the inner core pipe 3, as shown in fig. 3, the coupling body 1 is cylindrical and has a through hole, the through hole of the coupling body 1 is designed in a sectional manner, the pipe connecting portion 11 is arranged on the inner wall of the coupling body 1 from the outside to the center of the two ends, the pipe connecting portion 11 is used for connecting the two pipe bodies 5, the two pipe connecting portions 11 are not connected with each other, the inner wall of the coupling body 1 is provided with the extending portion 12 between the two pipe connecting portions 11, the extending portion 12 is provided with a positioning groove 121 for fixing the inner core pipe 3 and an upper sealing surface 122 for sealing the end of the inner core pipe 3, the extending portion 12 is recessed downward near the pipe connecting portion 11 adjacent to the extending portion to form the positioning groove 121, and the positioning groove 121 is provided with the hole retainer ring 2, after the inner core tube 3 is assembled, the inner core tube 3 is positioned and fixed by the hole stopper 2, and the step portion 31 at one end of the inner core tube 3 is attached to the upper seal surface 122 and sealed by the seal ring 4 on the seal groove 311.
The upper sealing surface 122 has a positioning block 123 protruding upward near the pipe connecting portion 11 adjacent thereto, and the positioning block 123 enables further positioning connection of the core tube 3 after being mounted on the coupling body 1, so that the core tube 3 can be mounted more quickly and accurately. After the inner core tube 3 is installed in the coupling body 1, the stepped part 31 is arranged on the inner core tube 3, so that the stepped part 31 can be abutted against the positioning block 123 after being installed in place, and the inner core tube 3 can be accurately installed in place without displacement through the matching use of the hole check ring 2.
Meanwhile, a supplementary heat-insulating layer 7 covering the inner core pipe 3 is arranged at one end, close to the joint main body 8, of the pipeline main body 5, the supplementary heat-insulating layer 7 is close to the main heat-insulating layer 6, the covering range of the heat-insulating layer is wider, the heat-insulating effect is improved, the main heat-insulating layer 6 and the supplementary heat-insulating layer 7 can be made of aerogel felts or made of double-component polyurethane pouring forming and other heat-insulating materials, the supplementary heat-insulating layer is formed by winding and coating, and other plastic foaming materials can be used.
In the first embodiment, the joint main body 8 is used for connecting the pipeline main body 5 and sealing the inner core tube 3 used in the hot fluid collecting process, as shown in fig. 4, the joint main body 8 is a cylindrical structure and has a through hole, the through hole of the joint main body 8 is also designed in a sectional manner, an inner mounting portion 81 and a lower sealing surface 82 are arranged from one side to the other side in the joint main body 8, an internal thread for directly connecting with the lower end of the pipeline main body 5 is arranged on the inner mounting portion 81, the lower sealing surface 82 is arranged on one side of the inner mounting portion 81 and extends to the end surface in the joint main body 8, the step portion 31 at the other end of the inner core tube 3 is mounted on the lower sealing surface 82 and is sealed by the sealing ring 4; the outside of the coupling body 8 is provided with an external mounting portion 83, the external mounting portion 83 extending to an end surface on the same side as the upper and lower sealing surfaces 82 of the coupling body 8, the external mounting portion 83 having an external thread for coupling with a pipe.
In the joint main part 8, internal thread and oil pipe lug connection in the interior installation department 81, the parameter of general oil pipe coupling can be referred to internal thread structure and size, external screw thread and oil pipe coupling in the external installation department 83 are connected, the parameter of external screw thread structure and size also can refer to general oil pipe parameter, lower sealed face 82 structure through this joint main part 8 sets up, directly set up conventional seal structure on joint main part 8, simultaneously this lower sealed face 82 extends to the terminal surface that connects main part 8 inside, can be more convenient, sealing performance when more effective promotion oil pipe connects, still can carry out good connection, sealed to oil pipe, the core pipe under the condition of the angular displacement that can produce between two upper and lower couplings when because the length change that expend with heat and contract with cold and oil pipe is in the on-the-spot fastening operation in oil field.
In the first embodiment, in order to better connect the oil pipe with the pipeline and connect the pipeline with the core pipe and to make the pipeline assembly more convenient in the processing and assembling processes, the external mounting portion 83 extends to the end surface of the joint main body 8 on the same side as the lower sealing surface 82, and meanwhile, the length of the external mounting portion 83 is smaller than that of the lower sealing surface 82.
In the first embodiment of the invention, the materials of the coupling body 1 and the joint body 8 can be made of all metal materials allowed to be used in the current standard, and can be made of steel grades J55, K55, N80, L80, P110 and the like.
In addition, in the first embodiment provided by the present invention, the outer diameters of the coupling body 1 and the coupling body 8 may be in the size range of 30mm to 300mm, the inner diameters of the coupling body 1 and the coupling body 8 may be in the size range of 25mm to 250mm, and the wall thicknesses of the coupling body 1 and the coupling body 8 may be in the size range of 5mm to 50mm, so that the basic sizes of the coupling body 1 and the special coupling according to the first embodiment of the present invention may be in the size of the current standard, the length of the coupling body may be designed according to a small-caliber steel pipe, or the coupling body may be specially designed and manufactured according to the user requirements, the coupling body 1 and the coupling body 8 may be designed according to a reinforcement design standard if reinforcement is needed, and preferably, the outer diameters of the coupling body 1 and the coupling body 8 are 141.3mm or 73mm, and the. The coupling main body 1 and the special joint reserve a connection method of a common joint, the coupling main body 1 and the special joint can be used for reconstruction and connection of an old oil pipe and can also be used for connection of a newly designed oil pipe, and the problem of difficulty in controlling the size, surface flatness and roughness and great influence on the sealing effect due to the machining precision of the pipe particularly when the old oil pipe is adopted is avoided. By adopting the special joint of the first embodiment of the invention, the coupling body 1 and the joint body 8 are sealed, so that the size precision, the roughness and the like of the coupling body 1 and the joint body 8 are easy to control, and the special joint is convenient to replace and repair even if problems exist.
In the first embodiment of the present invention, the inner core tube 3 is used as an inner pressure-bearing tube and needs to bear the inner pressure, so the material of the inner core tube 3 is made of a high-strength steel tube or a special ultra-high tube, and the step portions 31 at the two ends of the inner core tube 3 may be formed by local upsetting and then by metal working, or may be formed by welding a welding member and then by metal working.
In the first embodiment of the present invention, the rubber seal ring 4 may be used as the seal ring 4, and the shape of the seal ring 4 may be an "O" shape or a star shape, but the present invention is not limited thereto.
Example two
The invention also discloses an embodiment II, which is characterized in that the invention has the same structures as the pipeline main body 5, the coupling main body 1, the joint main body 8, the inner core pipe 3, the main heat insulation layer 6 and the like of the embodiment I, as shown in figure 2, the embodiment II is also provided with the lining pipe 9 arranged in the inner core pipe 3, the lining pipe 9 is used for judging whether the oil extraction machine or the geothermal fluid collecting equipment has further requirements of heat insulation, eccentric wear prevention and corrosion prevention, in order to further improve the heat insulation, eccentric wear prevention and corrosion prevention performance, the lining pipe 9 adopts an ultra-high molecular weight polyethylene pipe material, heat-resistant polyethylene or other polyethylene pipe materials, the lining pipe 9 is lined in the inner core pipe 3 by a diameter reducing technology and then adopts a port processing technology to process, and the lining pipes 9 are respectively embedded at two ends of the inner core pipe 3 to prevent pipe channeling.
In the first embodiment, the coupling body 1, the joint body 8, the inner core pipe 3, the main insulation layer 6 and the sealing ring 4 are generally referred to as a "combined inner core" in the pipeline assembly; similarly, in the second embodiment, the coupling body 1, the joint body 8, the core pipe 3, the main insulation layer 6, the packing 4, and the lining pipe 9 are generally referred to as "combined cores" in the pipe assembly.
In the following description of the manufacturing process of the pipe assembly in the first embodiment and the second embodiment, reference may be made to the following manufacturing processes:
(1) the two special couplings, namely the coupling main body 1 and the joint main body 8, are manufactured by a professional processing factory according to the figures;
(2) the sealing ring 4, the check ring 2 for the hole and the pipeline main body 5 are purchased according to the standard requirement;
(3) the main insulating layer 6 and the supplementary insulating layer 7 are purchased as required, the aerogel felt and other plastic foaming plates are cut and coated in a factory as required, and if polyurethane is adopted for self foaming, the process can be finished in the factory;
(4) and purchasing the inner core pipe 3 meeting the strength requirement according to the requirement, upsetting and processing the two ends of the pipe. If the welding parts are combined, measures must be taken to ensure that the deformation of the material is within the required range and the concentricity of the sealing parts at the two ends is within the required range during the welding in a factory;
(5) fastening the coupling body 1 on the pipeline body 5 as required;
(6) the combination is carried out according to the structure of the combined inner core, the supplementary heat insulation layer 7 and the sealing ring 4 positioned at one end of the joint main body 8 are not installed, the combination is plugged into the pipeline main body 5 from the coupling main body 1, and then the retainer ring 2 for the hole is installed;
(7) the mounting part is supplemented with the heat-insulating layer 7, then the sealing ring 4 positioned at one end of the joint main body 8 is mounted, and finally the joint main body 8 is mounted and fastened as required.
If the first embodiment is manufactured as described above, the process of inserting the liner tube 9 into the inner core tube 3 needs to be performed on a special processing device.
It should be noted that the above manufacturing flow is for the convenience of implementing the present invention by those skilled in the art, and should not be construed as limiting the technical solution of the present invention.
Through the application of the embodiment, the inner heat-insulating pipeline component utilizing the special coupling has the following advantages:
(1) the technical scheme of the invention belongs to an 'internal heat insulation' structure, and has good heat insulation effect and low cost;
(2) the coupling main body 1 and the joint main body 8 with special structures are matched for use, and the controllability of the dimensional precision and the roughness of a sealing part is good, so that the sealing performance of the inner core pipe 3 with inner heat insulation is greatly improved. If the coupling material with a special structure is made of stainless steel, the overall corrosion resistance and the reusability of the composite pipe fitting are improved;
(3) the basic structure type adopted in the first embodiment is suitable for rodless oil pumping and geothermal wells;
(4) the expansion structure of the second embodiment is adopted, the problems of eccentric wear prevention and corrosion prevention are considered while the heat preservation is emphasized, so that the ultra-high molecular weight polyethylene pipe and the like are lined in the innermost layer of the composite pipe, the composite pipe is more suitable for pumping oil with a rod, and the effect is more satisfactory when the composite pipe is used in a rodless oil pumping well and a geothermal well;
(5) the heat insulation structure of the pipeline main body 5 of the pipeline assembly, the inner core pipe 3 and the lining pipe 9 can be disassembled, so that the pipeline assembly is convenient to maintain after being processed and materials are convenient to reuse;
(6) the main heat-insulating layer 6 and the supplementary heat-insulating layer 7 are matched for use, so that the heat-insulating effect is further improved.
(7) The production process of the pipeline assembly is completed in a factory, the operation process of the field operation in the oil field is basically the same as that of the conventional oil pipe operation, and the conventional inspection of the oil pipe by the oil field is not influenced.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. An inner heat insulation pipeline assembly utilizing a special coupling is characterized by comprising a pipeline main body, a coupling main body arranged at the upper end of the pipeline main body, a joint main body arranged at the lower end of the pipeline main body and an inner core pipe arranged in the pipeline main body, wherein a main heat insulation layer is arranged between the pipeline main body and the inner core pipe;
the two ends of the inner core pipe are provided with raised step parts, the step parts are provided with sealing grooves, and the sealing grooves are provided with sealing rings;
the inner wall of the coupling main body is provided with pipeline connecting parts from the outside to the center, an extending part is arranged between the two pipeline connecting parts on the inner wall of the coupling main body, a positioning groove for fixing the inner core pipe and an upper sealing surface for sealing the end part of the inner core pipe are formed in the extending part, the extending part is downwards sunken near the pipeline connecting part adjacent to the extending part to form the positioning groove, a hole check ring is arranged in the positioning groove, and a step part at one end of the inner core pipe is arranged on the upper sealing surface;
an inner mounting part and a lower sealing surface are arranged from one side to the other side in the joint main body, an internal thread for being directly connected with the lower end of the pipeline main body is arranged on the inner mounting part, and a step part at the other end of the inner core pipe is arranged on the lower sealing surface; the outside of connecting the main part is provided with the external installation department, have the external screw thread on the external installation department.
2. The inner insulated pipe assembly using a special collar as claimed in claim 1, wherein: the lower sealing surface is arranged on one side of the inner mounting part and extends to the end surface inside the joint main body, the outer mounting part extends to the end surface on the same side of the upper sealing surface and the lower sealing surface of the joint main body, and the length of the outer mounting part is smaller than that of the sealing surface.
3. The inner thermal insulation pipeline assembly using a special collar as claimed in claim 1, wherein the collar body and the joint body are made of metal materials with steel grade J55, K55, N80, L80 or P110.
4. An inner insulated pipe assembly using a specialty collar as claimed in any one of claims 1 to 3 wherein: the outer diameters of the coupling main body and the joint main body are in the size range of 30-300 mm, the inner diameters of the coupling main body and the joint main body are in the size range of 25-250 mm, and the wall thicknesses of the coupling main body and the joint main body are in the size range of 5-50 mm.
5. The inner insulated pipe assembly using a special collar as claimed in claim 4, wherein: each step part is provided with two sealing grooves, and one sealing ring is installed in each sealing groove.
6. The inner insulated pipe assembly using a special collar as claimed in claim 5, wherein: the shape of the sealing ring is O-shaped or star-shaped.
7. The inner insulated pipe assembly using a special collar as claimed in claim 5, wherein: the main insulating layer and the supplementary insulating layer are made of aerogel felt or bi-component polyurethane.
8. The inner insulated pipe assembly using a special collar as claimed in claim 7, wherein: and the step parts at the two ends of the inner core pipe are subjected to metal processing after local upsetting or are subjected to metal processing after welding by adopting a welding part.
9. The inner insulated pipe assembly using a special collar as claimed in claim 1, wherein: and a lining pipe is arranged inside the inner core pipe.
10. The inner insulated pipe assembly using a special collar as claimed in claim 9, wherein: the lining pipe is made of ultra-high molecular weight polyethylene pipe or heat-resistant polyethylene.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010403447.9A CN111503431A (en) | 2020-05-13 | 2020-05-13 | Utilize interior thermal insulation pipeline subassembly of special coupling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010403447.9A CN111503431A (en) | 2020-05-13 | 2020-05-13 | Utilize interior thermal insulation pipeline subassembly of special coupling |
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| CN111503431A true CN111503431A (en) | 2020-08-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010403447.9A Pending CN111503431A (en) | 2020-05-13 | 2020-05-13 | Utilize interior thermal insulation pipeline subassembly of special coupling |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113027350A (en) * | 2021-05-10 | 2021-06-25 | 中海油能源发展股份有限公司工程技术分公司 | Heat-point-free heat insulation oil pipe column structure |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11108266A (en) * | 1997-10-08 | 1999-04-20 | Hitachi Metals Ltd | Joint for connecting polyethylene pipe |
| CN105178877A (en) * | 2015-09-25 | 2015-12-23 | 江苏联冠高新技术有限公司 | Composite thermal insulation oil pipe |
| CN209976485U (en) * | 2019-04-04 | 2020-01-21 | 东营市三和石油装备有限公司 | High-temperature-resistant lining oil pipe |
-
2020
- 2020-05-13 CN CN202010403447.9A patent/CN111503431A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11108266A (en) * | 1997-10-08 | 1999-04-20 | Hitachi Metals Ltd | Joint for connecting polyethylene pipe |
| CN105178877A (en) * | 2015-09-25 | 2015-12-23 | 江苏联冠高新技术有限公司 | Composite thermal insulation oil pipe |
| CN209976485U (en) * | 2019-04-04 | 2020-01-21 | 东营市三和石油装备有限公司 | High-temperature-resistant lining oil pipe |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113027350A (en) * | 2021-05-10 | 2021-06-25 | 中海油能源发展股份有限公司工程技术分公司 | Heat-point-free heat insulation oil pipe column structure |
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