Pressure test assembly for oil field pipeline

Abstract

A pressure test assembly for an oil field pipeline relates to the technical field of pipeline pressure test. The plugging assembly comprises a positioning sleeve and a fastening sleeve, a spigot is arranged in an inner hole in the left side of the positioning sleeve and abuts against the end face of a pressure-tested pipeline, a conical hole is formed in the right side of the positioning sleeve, the fastening sleeve is installed in the conical hole, the outer circle of the fastening sleeve is of a conical column structure, the conical column and the conical hole are the same in taper, and through holes A which are circumferentially and evenly distributed are formed in the fastening sleeve in the axial direction. And the through hole A penetrates through the fastening sleeve left and right. The utility model has the beneficial effects that the conical column of the fastening sleeve is contracted to form interference fit with the pipeline so as to transversely fix the positioning sleeve on the pipeline, the port of the pipeline is sealed through the center head, the filler and the gland, the pressure test can be carried out, the fastening bolt is loosened after the pressure test is finished so as to detach the plugging assembly from the two ends of the pipeline, and the operation is convenient. Operation is simple, plugging is reliable, and the pipeline is not damaged in the pressure testing process.

Description

Technical Field

[0001] This utility model relates to the field of pipeline pressure testing technology, and in particular to a pressure testing component for oilfield pipelines. Background Technology

[0002] Oilfields commonly use pipelines to transport crude oil, sewage, etc. After laying and welding a section of pipeline, it is necessary to pressure test the pipeline to check the quality of the weld and ensure the construction effect. Currently, during pressure testing, blind flanges or flanges are welded on both sides of the pipeline to be tested to seal both sides of the pipeline before pressure testing. After pressure testing, the blind flanges need to be thermally cut off to restore the bevel of the pipeline end. The pressure testing work is complicated and can easily cause changes in the metallographic structure of the pipeline end during thermal cutting. Utility Model Content

[0003] To address the problems of complex pipeline pressure testing operations that damage the pipeline's metallographic structure, this utility model provides a pressure testing component for oilfield pipelines.

[0004] The technical solution provided by this utility model is: a pressure testing assembly for oilfield pipelines, including two sealing assemblies with identical structures. The sealing assembly on the left includes a positioning sleeve and a fastening sleeve. The positioning sleeve has a stop in its left inner hole, which rests on the end face of the pipeline being tested. The positioning sleeve has a conical hole on its right side, in which a fastening sleeve is installed. The outer circle of the fastening sleeve is a conical cylindrical structure with the same taper as the conical hole. The fastening sleeve has circumferentially distributed through holes A along the axial direction, which penetrate the fastening sleeve on both sides. The positioning sleeve has threaded holes that penetrate the fastening sleeve on both sides at the corresponding positions of the through holes A. The positioning sleeve and the fastening sleeve are connected by bolts. The bolts pass through the through holes A of the fastening sleeve and then connect to the threaded holes of the positioning sleeve. The inner hole of the fastening sleeve is larger than the outer diameter of the pipeline being tested. The wall thickness of the fastening sleeve has a through slit along the axial direction.

[0005] It also includes a center head, which consists of a cylindrical section. A retaining ring with an increased diameter is provided on the right side of the cylinder. The outer diameter of the retaining ring is smaller than the inner diameter of the pipe being tested. The center head is installed inside the pipe being tested. Packing material is wound between the cylinder and the inner hole of the pipe being tested. A gland is installed on the outside of the packing material. The gland is positioned on the left side of the packing material and is bolted to the positioning sleeve. A support plate is bolted to the left side of the center head. The support plate is bolted to the positioning sleeve. A positioning nut is threaded onto the right side of the support plate using the studs of the bolts.

[0006] One of the sealing assemblies has a threaded hole running through the center of the assembly to connect to the test pipeline. The support plate of the sealing assembly has a through hole B at the gas pipeline interface, through which the test pipeline passes.

[0007] The beneficial effects of this utility model are as follows: by using the conical column of the fastening sleeve to shrink, an interference fit is formed with the pipeline to fix the positioning sleeve laterally on the pipeline. Then, the pipeline port is sealed by the center head, filler and gland, and pressure test can be carried out. After the pressure test, the fastening bolts can be loosened to remove the sealing assembly from both ends of the pipeline. The operation is simple, the sealing is reliable, and there is no damage to the pipeline during the pressure test. Attached Figure Description

[0008] Appendix Figure 1 This is a schematic diagram of the structure of this utility model;

[0009] Appendix Figure 2 A schematic diagram of the positioning sleeve in this utility model;

[0010] Appendix Figure 3 This is a schematic diagram of the fastening sleeve in this utility model;

[0011] Appendix Figure 4 A schematic diagram of the structure of the center head in this utility model.

[0012] In the diagram, 1-positioning sleeve, 11-conical hole, 12-threaded hole, 13-stop, 2-fastening sleeve, 21-through hole A, 22-cut, 23-conical column, 3-pressure cap, 4-center head, 41-cylinder, 42-retaining ring, 5-support plate, 6-filling, 7-gas line interface, 8-through hole B, 9-fastening bolt, 10-positioning nut. Detailed Implementation

[0013] like Figures 1-4 As shown, a pressure testing assembly for oilfield pipelines includes two sealing assemblies with identical structures. The left sealing assembly includes a positioning sleeve 1 and a fastening sleeve 2. The positioning sleeve 1 has a stop 13 in its left inner hole, which rests against the end face of the pipeline being tested. The positioning sleeve 1 has a conical hole 11 on its right side, and the fastening sleeve 2 is installed inside the conical hole 11. The outer circle of the fastening sleeve 2 is a conical column 23, and the conical column 23 has the same taper as the conical hole 11. Sleeve 2 has circumferentially distributed through holes A21 along the axial direction. Through holes A21 pass through the fastening sleeve 2 from left to right. Positioning sleeve 1 has threaded holes 12 that pass through the left and right directions at the corresponding positions of through holes A21. Positioning sleeve 1 and fastening sleeve 2 are connected by fastening bolts 9. The screw of fastening bolt 9 passes through the through hole A21 of the fastening sleeve and then connects to the threaded hole 12 of the positioning sleeve 1. The inner diameter of fastening sleeve 2 is larger than the outer diameter of the pipe being tested. The wall thickness of fastening sleeve 2 has through slits 22 along the axial direction.

[0014] It also includes a center head 4, which includes a cylindrical section 41. A retaining ring 42 with an increased diameter is provided on the right side of the cylindrical section 41. The outer diameter of the retaining ring 42 is smaller than the inner diameter of the pipe being tested. The center head 4 is installed inside the pipe being tested. A packing 6 is wound between the cylindrical section 41 and the inner hole of the pipe being tested. A pressure cap 3 is installed on the outside of the packing 6. The pressure cap 3 is blocked on the left side of the packing 6. The pressure cap 3 is bolted to the positioning sleeve 1. A support plate 5 is bolted to the left side of the center head 4. The support plate 5 is bolted to the positioning sleeve 1. A positioning nut 10 is threaded on the right side of the support plate 5, so that the center head 4 and the positioning sleeve 1 are laterally fixed.

[0015] The key to pipeline pressure testing lies in how to seal both ends of the pipeline before conducting the test. In this scheme, the positioning sleeve 1 and the fastening sleeve 2 are placed on the outside of one end of the pipeline to be tested, and the fastening bolts 9 are tightened one by one. The distance between the positioning sleeve 1 and the fastening sleeve 2 is pulled closer, and the slit 22 shrinks under the restraint of the conical hole 11. The inner hole of the fastening sleeve 2 gradually shrinks until the inner hole of the fastening sleeve 2 and the pipeline to be tested achieve an interference fit. In terms of structural strength, it can be the same as that of integrated manufacturing. The positioning sleeve 1 is fixed laterally on the pipeline, and the packing 6 seals the pipeline end for pressure testing.

[0016] One of the sealing assemblies has a central head 4 with a through-hole 7 for connecting the pressure test line. The support plate 5 of the sealing assembly has a through hole B8 at the position of the through-hole 7, through which the pressure test line passes.

[0017] By using the conical column 23 of the fastening sleeve 2 to contract and form an interference fit with the pipeline, the positioning sleeve 1 is horizontally fixed on the pipeline. Then, the pipeline port is sealed by the center head 4, the packing 6 and the gland 3, and a pressure test can be carried out. After the pressure test, the fastening bolts 9 can be loosened to remove the sealing assembly from both ends of the pipeline. The operation is simple, the sealing is reliable, and there is no damage to the pipeline during the pressure test.

Claims

1. A pressure testing assembly for oilfield pipelines, comprising two sealing assemblies, characterized in that: The two sealing assemblies have the same structure. The sealing assembly on the left includes a positioning sleeve (1) and a fastening sleeve (2). The positioning sleeve (1) has a stop (13) in the inner hole on the left side. The stop (13) rests on the end face of the pipe being tested. The positioning sleeve (1) has a conical hole (11) on the right side. The fastening sleeve (2) is installed in the conical hole (11). The outer circle of the fastening sleeve (2) is a conical cylinder (23) structure. The conical cylinder (23) has the same taper as the conical hole (11). The fastening sleeve (2) has circumferentially distributed through holes along the axial direction. A(21), through hole A(21) through fastening sleeve (2), positioning sleeve (1) has a threaded hole (12) through hole (12) at the corresponding position of through hole A(21), positioning sleeve (1) and fastening sleeve (2) are connected by fastening bolt (9), the screw of fastening bolt (9) passes through through hole A(21) of fastening sleeve and then connects to threaded hole (12) of positioning sleeve (1), the inner hole of fastening sleeve (2) is larger than the outer diameter of the pipe being tested, and the wall thickness of fastening sleeve (2) has a through slit (22) along the axial direction; It also includes a center head (4), which includes a cylindrical section (41). A retaining ring (42) with a larger diameter is provided on the right side of the cylindrical section (41). The outer diameter of the retaining ring (42) is smaller than the inner diameter of the pipe under test. The center head (4) is installed inside the pipe under test. A packing material (6) is wound between the cylindrical section (41) and the inner hole of the pipe under test. A pressure cap (3) is installed on the outside of the packing material (6). The pressure cap (3) is blocked on the left side of the packing material (6). The pressure cap (3) is connected to the positioning sleeve (1) by bolts. The left side of the center head (4) is connected to the support plate (5) by bolts. The support plate (5) is connected to the positioning sleeve (1) by bolts. The stud of the bolt is threaded with a positioning nut (10) on the right side of the support plate (5). One of the sealing assemblies has a central head (4) with a through-hole (7) for connecting the pressure test line. The support plate (5) of the sealing assembly has a through hole (8) at the position of the through-hole (7), through which the pressure test line passes.

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