Pipeline pull-back head and directional drilling double-layer pipeline same-hole penetrating method

Abstract

The pipeline pull-back head comprises a sleeve traction pipe fastener, the front end of the sleeve traction pipe fastener is connected with a pull-back head connecting ring, and the rear end of the sleeve traction pipe fastener is sequentially connected with an oil and gas pipeline traction ring, an oil and gas pipeline adjusting ring and an oil and gas pipeline dragging ring. The rear end of the oil and gas pipeline dragging ring is connected with an oil pipe traction pipe fastener, the oil and gas pipeline adjusting ring is sleeved with the oil and gas pipeline traction ring, and the oil and gas pipeline dragging ring is sleeved with the oil and gas pipeline adjusting ring. By the adoption of the oil-gas pipeline and sleeve double-layer pipeline same-hole penetrating method, the influence of leakage on a river when the oil-gas pipeline penetrates through the river can be effectively relieved, the risk and investment caused by two-time penetrating of conventional directional drilling are reduced, meanwhile, the possibility is provided for two-time pipe penetrating of the directional drilling penetrating pipeline, and the construction efficiency is improved. And the secondary crossing work of directional drilling on the river after corrosion of the oil-gas pipeline is reduced.

Description

Technical Field

[0001] The invention belongs to the field of oil and gas pipeline construction, and in particular relates to a pipeline return towing head and a directional drilling double-layer pipeline same-hole crossing method. Background Art

[0002] When oil and gas pipelines cross rivers, casing needs to be added outside the oil and gas pipelines to prevent the impact of oil and gas leakage on the river. The conventional way of passage is "excavation + casing", which is not suitable for non-seasonal rivers with wide rivers, deep rivers and large water flow. At the same time, since the "excavation + casing" method requires a larger casing diameter, it increases the construction time and engineering safety risks. At present, when casing needs to be added for oil and gas directional drilling crossing, the oil and gas pipeline and casing are usually pulled back twice, which not only increases the risk of damage to the pipeline anti-corrosion layer, but also increases the investment in directional drilling crossing. Summary of the invention

[0003] The purpose of the invention is to provide a pipeline pulling back head and a directional drilling double-layer pipeline same-hole crossing method, so as to pull back the casing and the oil pipe at one time.

[0004] The object of the present invention is to provide a pipeline return towing head, comprising a casing traction pipe fastener, wherein the front end of the casing traction pipe fastener is connected to a return towing head connecting ring, and the rear end is sequentially connected to three rings, namely, an oil and gas pipeline traction ring, an oil and gas pipeline adjustment ring and an oil and gas pipeline dragging ring, the rear end of the oil and gas pipeline dragging ring is connected to an oil pipe traction pipe fastener, the oil and gas pipeline adjustment ring is sleeved in the oil and gas pipeline traction ring, and the oil and gas pipeline dragging ring is sleeved in the oil and gas pipeline adjustment ring.

[0005] The oil and gas pipeline traction ring and the oil and gas pipeline dragging ring are located on a horizontal plane, and the horizontal plane where the oil and gas pipeline adjustment ring is located is perpendicular to the horizontal plane of the oil and gas pipeline traction ring.

[0006] A directional drilling double-layer pipeline same-hole crossing method comprises the following steps:

[0007] Connect the adjustable sliding insulating support outside the oil and gas pipeline, insert the oil and gas pipeline and the adjustable sliding insulating support into the casing together, and the other end of the adjustable sliding insulating support contacts the casing;

[0008] Connect the directional drilling through-back tug N1 at one end of the casing, and connect the directional drilling through-plugging head N2 at the other end to seal the casing. The directional drilling through-back tug N1 is connected to the through-pipe tug of the oil and gas pipeline. The casing traction pipe fastener is connected to the outside of the directional drilling through-back tug N1. The rear end structure of the casing traction pipe fastener extends into the casing, and the oil pipe traction pipe fastener is connected to the end of the oil and gas pipeline.

[0009] A directional drilling reamer, a rotating universal joint and a directional connection U-shaped ring are sequentially connected to the rear of the directional drilling drill pipe, and the end of the directional connection U-shaped ring is connected to the return head connection ring of the pipeline return head on the directional drilling return head N1;

[0010] The directional drilling drill pipe rotates during the pull-back process, driving the directional drilling reamer to rotate and expand the channel so that the casing can pass through, and the rotating universal joint keeps the casing from rotating.

[0011] After the pipeline is pulled back, remove the directional drilling backhaul head N1 and the directional drilling plugging head N2, and connect waterproof seals at both ends of the casing.

[0012] A test pipe is also provided, one end of which is located outside and the other end of which passes through the waterproof seal and is located inside the casing.

[0013] If the casing is a steel pipe, a sacrificial anode device is connected to protect the casing after the pipeline is pulled back.

[0014] If the casing diameter is less than or equal to DN150 and the crossing length is less than or equal to 300m, the casing shall be made of non-metallic flexible composite pipe; if the casing diameter is greater than DN150, the casing shall be made of steel pipe.

[0015] The beneficial effects of the present invention are:

[0016] 1. The pipeline hauling head adopts a three-ring structure to realize the traction of the oil and gas pipeline by the drilling rig during directional drilling, and at the same time reduce the stress caused by the position deviation between the oil and gas pipeline and the casing during the construction process.

[0017] 2. Use casing and tubing to return at one time to reduce the risk of pipeline anti-corrosion layer damage and directional drilling investment.

[0018] 3. The sampling pipeline is used for regular combustible gas detection to determine whether there is oil and gas leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the oil and gas pipeline and casing layout;

[0020] Figure 2 It is a schematic diagram of the connection terminal combination;

[0021] Figure 3 This is a schematic diagram of the pipeline return head structure;

[0022] Figure 4 It is a schematic diagram of the installation of the sacrificial anode device;

[0023] In the figure: 1, casing; 2, oil and gas pipeline; 3, adjustable sliding insulation support; 4, directional drilling drill pipe; 5, directional drilling reamer; 6, rotating universal joint; 7, directional connection U-shaped ring; N1, directional drilling through the backhaul head; N2, directional drilling through the plugging head;

[0024] 11. Return towing head connection ring; 12. Casing traction pipe fasteners; 13. Oil and gas pipeline traction ring; 14. Oil and gas pipeline adjustment ring; 15. Oil and gas pipeline drag ring; 16. Oil pipeline traction pipe fasteners; 17. Casing connection section; 18. Oil and gas pipe connection section;

[0025] 19. Sacrificial anode test pile; 20. Test pipe; 21. Waterproof seal; 22. Sacrificial anode belt; 23. Sacrificial anode connection line.

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0027] [Example 1]

[0028] like Figure 1 As shown, a pipeline return towing head comprises a casing traction pipe fastener 12, the front end of the casing traction pipe fastener 12 is connected to a return towing head connecting ring 11, and the rear end is sequentially connected to three rings: an oil and gas pipeline traction ring 13, an oil and gas pipeline adjustment ring 14 and an oil and gas pipeline dragging ring 15, the rear end of the oil and gas pipeline dragging ring 15 is connected to an oil pipe traction pipe fastener 16, the oil and gas pipeline adjustment ring 14 is sleeved in the oil and gas pipeline traction ring 13, and the oil and gas pipeline dragging ring 15 is sleeved in the oil and gas pipeline adjustment ring 14.

[0029] The casing traction tube fastener 12 and the oil pipe traction tube fastener 16 are respectively fixed on the casing 1 and the oil and gas pipeline 2. Figure 3 On the casing connecting section 17 and the oil and gas pipe connecting section 18. The tractor connecting ring 11 is when towing back, and the towing back device is connected to the towing back connecting ring 11, dragging the entire pipeline towing back and the casing 1 to move.

[0030] The oil and gas pipeline traction ring 13, the oil and gas pipeline adjustment ring 14 and the oil and gas pipeline dragging ring 15 are three circular rings which are socketed in sequence. The oil and gas pipeline traction ring 13 is socketed with the oil and gas pipeline adjustment ring 14, the oil and gas pipeline adjustment ring 14 is socketed with the oil and gas pipeline dragging ring 15, and the oil and gas pipeline traction ring 13 is not socketed with the oil and gas pipeline dragging ring 15. Through the three-ring structure, the allowable rotational displacement of the oil and gas pipeline 2 and the casing 1 is increased, and the oil and gas pipeline traction ring 13 and the oil and gas pipeline dragging ring 15 are prevented from twisting off when the oil and gas pipeline traction ring 13 and the oil and gas pipeline dragging ring 15 are directly socketed, and the pipeline stress caused by torque when the oil and gas pipeline 2 and the casing 1 are directly connected is avoided.

[0031] The oil and gas pipeline traction ring 13 and the oil and gas pipeline dragging ring 15 are located on a horizontal plane, and the horizontal plane where the oil and gas pipeline adjustment ring 14 is located is perpendicular to the horizontal plane of the oil and gas pipeline traction ring 13 .

[0032] like Figure 1 As shown, the circular ring structures of the oil and gas pipeline traction ring 13 and the oil and gas pipeline dragging ring 15 are located on the same horizontal plane, and the plane where the circular ring of the oil and gas pipeline adjustment ring 14 is located is perpendicular to the horizontal plane of the oil and gas pipeline traction ring 13.

[0033] A directional drilling double-layer pipeline same-hole crossing method comprises the following steps:

[0034] The adjustable sliding insulating support 3 is connected to the outside of the oil and gas pipeline 2 , and the oil and gas pipeline 2 and the adjustable sliding insulating support 3 are inserted into the casing 1 together, and the other end of the adjustable sliding insulating support 3 is in contact with the casing 1 .

[0035] Before the pull-back construction, the adjustable sliding insulating support 3 is connected to the outside of the oil and gas pipeline 2, and the two are inserted into the casing 1. The adjustable sliding insulating support 3 contacts the inner wall of the casing 1, and the oil and gas pipeline 2 is fixed in the air inside the casing 1. The inner diameter of the casing is 100mm to 150mm larger than the oil and gas pipeline, and the spacing of the adjustable sliding insulating support 3 is maintained at 3m to 8m. The adjustable sliding insulating support 3 solves the problem of the oil and gas pipeline 2 entering the casing 1 over a long distance.

[0036] A directional drilling return tug N1 is connected to one end of the casing 1, and a directional drilling return plugging head N2 is connected to the other end to seal the casing 1. The directional drilling return tug N1 is connected to the pipeline return tug of the oil and gas pipeline 2. The casing traction pipe fastener 12 is connected to the outside of the directional drilling return tug N1, and the rear end structure of the casing traction pipe fastener 12 extends into the casing 1. The oil pipe traction pipe fastener 16 is connected to the end of the oil and gas pipeline 2.

[0037] After the oil and gas pipeline 2 is fixed, the directional drilling traversing return head N1 and the directional drilling traversing plugging head N2 are respectively connected to the two ends of the casing 1 to seal the casing 1.

[0038] like Figure 3 As shown, the directional drill passes through the casing traction pipe fastener 12 connected to the pipeline return tractor N1, as shown in FIG. Figure 1 As shown, the directional drill connected to the left passes through the outer wall of the return tug N1, the three-ring part of the pipeline return tug is located between the casing 1 and the oil and gas pipeline 2, and the oil pipeline traction pipe fastener 16 is connected to the left end of the oil and gas pipeline 2.

[0039] A directional drilling reamer 5, a rotating universal joint 6 and a directional connection U-shaped ring 7 are connected in sequence behind the directional drilling drill rod 4. The end of the directional connection U-shaped ring 7 is connected to the return head connection ring 11 of the pipeline return head on the directional drilling return head N1.

[0040] When pulling back, first complete the guide hole operation on the pulling back path so that the directional drilling rod 4 can pass through, such as Figure 2 As shown, the directional drilling rod 4 is on the left, dragging the casing 1 on the right to the left.

[0041] The directional drilling rod 4 is passed through the left side of the guide hole and passed through the left side of the guide hole. The right side of the directional drilling rod 4 is connected to the directional drilling reamer 5, the rotating universal joint 6 and the directional connection U-shaped ring 7 in sequence. The directional connection U-shaped ring 7 is connected to the tractor connection ring 11 of the directional drilling through the pipeline on the tractor N1.

[0042] The directional drilling drill rod 4 rotates during the back-pulling process, driving the directional drilling reamer 5 to rotate and expand the channel so that the casing 1 can pass through, and the rotating universal joint 6 keeps the casing 1 from rotating.

[0043] After the connection is completed, the directional back-pulling work of the crossing pipeline is completed in accordance with the conventional directional drilling crossing method, that is, the directional drilling rig on the left drives the directional drilling drill rod 4 to rotate and move to the left, and the rotation of the directional drilling drill rod 4 drives the directional drilling reamer 5 to rotate, thereby expanding the underground passage so that the casing 1 can pass through. The directional drilling reamer 5 is larger than the casing 1 to ensure that the expanded passage can allow the casing 1 to pass through.

[0044] The purpose of the rotating universal joint 6 is to ensure that the directional connection U-shaped ring 7 does not rotate with the directional drilling reamer 5, so that the casing 1 at the rear remains stable.

[0045] After the pipeline is pulled back, the directional drilling back-pulling head N1 and the directional drilling plugging head N2 are removed, and waterproof seals 21 are connected at both ends of the casing 1.

[0046] like Figure 4 As shown, after the pull-back is completed, the directional drilling through-pull-back head N1 and the directional drilling through-plugging head N2 at both ends of the casing 1 are removed, and waterproof seals 21 are connected at both ends of the casing 1. The water-draining seal between the oil and gas pipeline 2 and the casing 1 is well done to prevent oil and gas leakage.

[0047] A test pipe 20 is also provided, one end of which is located outside, and the other end of which passes through a waterproof seal 21 and is located inside the casing 1 .

[0048] like Figure 4 As shown, after the waterproof seal 21 is connected, a sampling pipe 20 is also set. One end of the sampling pipe 20 passes through the waterproof seal 21 and is inserted into the space between the casing 1 and the oil and gas pipeline 2. The other end passes through the ground at a certain height to facilitate subsequent inspection. The diameter of the sampling pipe does not exceed DN50, and the length of the sampling pipe that penetrates into the casing 1 is generally 300mm to 500mm. The sampling pipe 20 is used for regular combustible gas detection to determine whether there is an oil and gas leak.

[0049] If the casing 1 is a steel pipeline, after the pipeline is pulled back, a sacrificial anode device is also connected to protect the casing 1.

[0050] The sacrificial anode device includes a sacrificial anode test pile 19 , a sacrificial anode belt 22 and a sacrificial anode connection line 23 .

[0051] The sacrificial anode test pile 19 is set on the ground, and the sacrificial anode belt 22 is installed directly between the casing 1 and the oil and gas pipeline 2 at both ends of the crossing section. After installation, the sacrificial anode connection line 23 is connected to the oil and gas pipeline 2 and the sacrificial test pile 19.

[0052] If the diameter of casing 1 is less than or equal to DN150 and the crossing length is less than or equal to 300m, casing 1 shall adopt non-metallic flexible composite pipe; if the diameter of casing 1 is greater than DN150, casing 1 shall adopt steel pipe.

[0053] By adopting the double-layer pipeline same-hole crossing method of the oil and gas pipeline 2 and the casing 1, the impact of leakage on the river when the oil and gas pipeline 2 crosses the river can be effectively mitigated, which not only reduces the risks and investment brought by the conventional directional drilling two crossings, but also provides the possibility for the secondary pipe penetration of the directional drilling crossing pipeline, and reduces the secondary directional drilling crossing of the river after the oil and gas pipeline is corroded.

Claims

1. A pipeline return head, characterized by: The invention comprises a casing traction tube fastener (12), wherein the front end of the casing traction tube fastener (12) is connected to a return traction head connection ring (11), and the rear end is sequentially connected to three rings, namely, an oil and gas pipeline traction ring (13), an oil and gas pipeline adjustment ring (14) and an oil and gas pipeline dragging ring (15), the rear end of the oil and gas pipeline dragging ring (15) is connected to an oil pipe traction tube fastener (16), the oil and gas pipeline adjustment ring (14) is sleeved in the oil and gas pipeline traction ring (13), and the oil and gas pipeline dragging ring (15) is sleeved in the oil and gas pipeline adjustment ring (14).

2. A pipeline return head according to claim 1, characterized in that: The oil and gas pipeline traction ring (13) and the oil and gas pipeline dragging ring (15) are located on a horizontal plane, and the horizontal plane where the oil and gas pipeline adjustment ring (14) is located is perpendicular to the horizontal plane of the oil and gas pipeline traction ring (13).

3. A directional drilling double-layer pipeline same-hole crossing method according to claim 1 or 2, characterized in that: The following steps are involved: An adjustable sliding insulating support (3) is connected to the outside of the oil and gas pipeline (2), and the oil and gas pipeline (2) and the adjustable sliding insulating support (3) are inserted into the casing (1) together, and the other end of the adjustable sliding insulating support (3) is in contact with the casing (1); A directional drilling return tug (N1) is connected to one end of the casing (1), and a directional drilling return plug (N2) is connected to the other end to seal the casing (1). The directional drilling return tug (N1) is connected to the oil and gas pipeline (2) through the pipeline return tug, and the casing traction pipe fastener (12) is connected to the outside of the directional drilling return tug (N1). The rear end structure of the casing traction pipe fastener (12) extends into the casing (1), and the oil pipe traction pipe fastener (16) is connected to the end of the oil and gas pipeline (2); A directional drilling reamer (5), a rotating universal joint (6) and a directional connection U-shaped ring (7) are sequentially connected to the rear of the directional drilling drill rod (4); the end of the directional connection U-shaped ring (7) is connected to a return head connection ring (11) of a pipeline return head on a directional drilling return head (N1); The directional drilling rod (4) rotates during the pulling back process, driving the directional drilling reamer (5) to rotate and expand the channel so that the casing (1) can pass through, and the rotating universal joint (6) keeps the casing (1) from rotating.

4. A directional drilling double-layer pipeline same-hole crossing method according to claim 3, characterized in that: After the pipeline is pulled back, the directional drilling back-pulling head (N1) and the directional drilling plugging head (N2) are removed, and waterproof seals (21) are connected to both ends of the casing (1).

5. A directional drilling double-layer pipeline same-hole crossing method according to claim 4, characterized in that: A test pipe (20) is also provided, one end of which is located outside, and the other end of which passes through a waterproof seal (21) and is located inside the casing (1).

6. A directional drilling double-layer pipeline same-hole crossing method according to claim 3, characterized in that: If the casing (1) is a steel pipeline, after the pipeline is pulled back, a sacrificial anode device is connected to protect the casing (1).

7. A directional drilling double-layer pipeline same-hole crossing method according to claim 3, characterized in that: If the diameter of the casing (1) is less than or equal to DN150 and the penetration length is less than or equal to 300m, the casing (1) adopts a non-metallic flexible composite pipe; if the diameter of the casing (1) is greater than DN150, the casing (1) adopts a steel pipe.

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