Offshore platform continuous capillary steel pipe through oil pipe cable cutting device and use method

Abstract

The present invention relates to the technical field of offshore oilfield oil and water well development, and in particular to an offshore platform continuous capillary steel pipe through oil pipe cable cutting device and a method of using the same. The technical scheme is: it includes a pipe cable cutting part and a pipe cable recovery part, the other end of the continuous capillary steel pipe of the pipe cable cutting part is connected to the upper end of the pipe cable cutting device downhole, and the well-retained pipe cable passes through the pipe cable cutting channel of the pipe cable cutting device; a counterweight is installed at the lower end of the pipe cutter, the upper end of the pipe cutter is connected to a hydraulic release hand, the upper end of the hydraulic release hand is connected to a rotary joint, and the upper end of the rotary joint is connected to the continuous capillary steel pipe; the beneficial effects are: the present invention can efficiently, accurately and safely complete the pipe cable cutting task, improve the efficiency of offshore oil production operations, and effectively reduce the post-processing costs and production losses; it avoids the problems of high cost and long time for single well operation on offshore mobile platforms in the prior art, saves operating costs, and can quickly resume production.

Description

Technical Field

[0001] The invention relates to the technical field of offshore oilfield oil and water well development, and in particular to an offshore platform continuous capillary steel pipe through oil pipe cable cutting device and a use method thereof. Background Art

[0002] In offshore oil production operations, dynamic monitoring of oil and water wells and continuous capillary tubing without moving the tubing string are important means to improve oil well productivity and optimize production results. However, during these construction processes, downhole tools or instruments are often stuck and cannot be recovered. Usually, the main means of unblocking are as follows: one is to lift and lower the stuck tools for active unblocking, and the other is to increase the lifting force and directly pull out the tools or instruments. However, the effects of the above two methods of unblocking are not ideal. Since the cables and pipelines are subjected to the greatest force at the wellhead, direct lifting to unblock will most likely break at the wellhead, causing the pipes and cables to remain in the well and cannot be removed. According to regulatory requirements, offshore oil and water wells are required to install downhole safety valves. Leaving pipes and cables in the well will cause the downhole safety valves to be unable to be closed, posing a major well control hazard.

[0003] Moreover, there are not many effective methods to deal with the situation where pipes and cables are left in the well. The main method is to use mobile platform operations to remove the original well pipes and the tools and pipes and cables stuck in the pipes. However, the cost of mobile platform operations is high and the operation cycle is long. Generally, the cost of a single well for offshore mobile platform operations exceeds 5 million yuan and the operation cycle is about 10 days. Therefore, the economic losses caused by it are huge. Summary of the invention

[0004] The purpose of the present invention is to address the above-mentioned defects of the prior art and to provide an offshore platform continuous capillary steel pipe through oil pipe cable cutting device and a method of use. A capillary steel pipe winch is used to control the downhole pipe and cable cutting device to be lowered to a specified position, and the continuous capillary steel pipe is pressurized through the ground to drive the wedge-shaped cone block of the downhole pipe and cable cutting device to move forward, thereby pushing the cutting blade outward, thereby cutting the cable or pipeline in the well and avoiding greater well control risks.

[0005] The present invention discloses an offshore platform continuous capillary steel pipe through oil pipe and cable cutting device, and its technical scheme is as follows: it comprises a continuous capillary steel pipe, and also comprises a cable cutting part and a cable recovery part, the cable cutting part comprises a continuous capillary steel pipe winch, a first roller, a first active retracting device, a first pulley, a double-channel sealing joint, a high-pressure tee, and a cable cutting device, the continuous capillary steel pipe winch is equipped with a first roller and a first active retracting device, one end of the continuous capillary steel pipe is wound around the first roller along the first pulley and the first active retracting device on the wellhead, the other end of the continuous capillary steel pipe is lowered into the inner cavity of the oil pipe along the double-channel sealing joint and the high-pressure tee of the wellhead, and is connected to the upper end of the cable cutting device, and the well-retained cable passes through the cable cutting channel of the cable cutting device; the cable cutting device comprises a rotary joint, a hydraulic release hand, a pipeline cutter and a counterweight, the lower end of the pipeline cutter is provided with a counterweight, the upper end of the pipeline cutter is connected to the hydraulic release hand, the upper end of the hydraulic release hand is connected to the rotary joint, and the upper end of the rotary joint is connected to the continuous capillary steel pipe;

[0006] The pipe and cable recovery part includes a pipe and cable recovery winch, a pipe and cable recovery, a second drum, a second active retracting and releasing device, and a second pulley. The second drum and the second active retracting and releasing device are installed on the pipe and cable recovery winch. The lower end of the pipe and cable recovery is connected to the well-retaining pipe and cable of the oil pipe as a whole. The upper end of the pipe and cable recovery is wound around the second drum along the second pulley and the second active retracting and releasing device on the wellhead.

[0007] Preferably, the above-mentioned pipeline cutter includes a cutter piston body, a push block, a cutting head, a cutting back plate, a pressure cover, a connecting rod, a shell, a cutter cylinder, and a return spring. The upper part of the shell is connected to the cutter cylinder, and the cutter piston body is installed on the upper part of the inner cavity of the cutter cylinder. The lower part of the cutter piston body is provided with a connecting rod and a return spring, and the lower end of the connecting rod is connected to the push block, and the lower end of the push block is slidably matched with the cutting head; a pressure cover is installed on the outer wall of the shell to form a pipe and cable cutting channel, and a cutting back plate is installed between the shell and the pressure cover, and the cutting head moves outward along the cutting back plate to complete the cutting of the well-retained pipe and cable.

[0008] Preferably, the push block is a wedge-shaped structure, and the push block with the wedge-shaped structure moves downward, driving the cutting head to move outward along the cutting back plate.

[0009] Preferably, shear nails are installed between the connecting rod and the inner wall of the shell, and the lower end of the connecting rod is connected to the push block through a connecting pin.

[0010] Preferably, an upper roller is provided at the upper part of the pipe and cable cutting channel formed between the shell and the gland, and a lower roller is provided at the lower part, and the upper roller and the lower roller are in rolling cooperation with the well-retaining pipe and cable.

[0011] Preferably, the above-mentioned rotary joint includes a pressure cap, an iron pad, a rubber sealing gasket, an upper pressure cap, a sealing ferrule, a retaining ring, a lower pressure cap, an upper shell, a first pin, a main body, a rotary short section, a connector, a lower shell, and a lower joint. An iron pad and a rubber sealing gasket are installed on the upper part of the inner cavity of the upper shell, and the top of the upper shell is connected to the pressure cap through an internal thread. After the continuous capillary steel tube passes through the upper shell, the iron pad and the rubber sealing gasket, the pressure cap is tightened to squeeze the iron pad and the rubber sealing gasket to play a multi-stage sealing role; the lower part of the upper shell is movably connected to the main body, and the upper pressure cap, a sealing ferrule, a retaining ring and a lower pressure cap are installed in the inner cavity of the upper shell; the lower part of the main body is connected to the lower shell, and a connector is installed in the lower shell, a rotary short section is installed between the connector and the main body, and the lower end of the connector is connected to the lower joint through the first pin.

[0012] Preferably, one or more first rotary seals are provided between the rotary nipple and the connector, a second rotary seal is provided between the middle of the connector and the lower shell; and the main body is connected to the upper shell and the lower shell respectively via second pins.

[0013] Preferably, the hydraulic release comprises an outer shell, a lower sealing ring, an upper sealing ring, a release pin, and a fishing head. The upper part of the outer shell is connected to the lower joint of the rotary joint, the lower part of the outer shell is connected to the upper part of the fishing head, the release pin is installed between the outer shell and the fishing head, and an upper sealing ring is provided between the outer shell and the fishing head. The lower end of the fishing head is movably connected to the upper end of the pipeline cutter, and a lower sealing ring is provided between the fishing head and the pipeline cutter.

[0014] Preferably, the above-mentioned cutting head includes a head base, a head support handle and a blade. The outer side of the head base is provided with a protrusion that slides with a groove provided on the inclined surface of the push block. The inner side of the head base is fixed with the head support handle, and the outer end of the head support handle is fixed with the blade. The blade moves along the cutting hole on the upper part of the cutting back plate to cut and disconnect the well pipe cable.

[0015] The method for using the offshore platform continuous capillary steel pipe through oil pipe and cable cutting device mentioned in the present invention comprises the following process:

[0016] 1. First, the continuous capillary steel tube passes through the pressure cap, iron pad, rubber gasket, upper shell, upper pressure cap, lower pressure cap and sealing ferrule, and is inserted into the through hole at the top of the body. Tighten the lower pressure cap first, then tighten the upper pressure cap, and after the upper shell is threadedly connected to the upper part of the body, pressurize the continuous capillary steel tube. After the air is discharged from the upper end of the pressure cap, tighten the pressure cap to complete the installation of the continuous capillary steel tube.

[0017] Second, pressurize the continuous capillary steel pipe at the wellhead. The pressure is transmitted to the cutter cylinder through the rotary joint and hydraulic release to push the cutter piston body downward, thereby driving the wedge-shaped push block to move downward. Under the push of the wedge-shaped push block, the cutting head slides on the inclined surface of the wedge-shaped push block and moves outward along the cutting back plate, cutting off the well-retaining pipe cable in the outer gland;

[0018] After the cutting head cuts off the well-retaining pipe and cable, the pipe and cable are recovered above and lifted out of the wellhead by the recovery pipe and cable winch; then, the continuous capillary steel pipe is depressurized, and the cutter piston body moves upward under the action of the return spring elastic force, driving the wedge-shaped push block and the cutting head back to the initial position;

[0019] 3. When the pipeline cutter is stuck and cannot be recovered, the continuous capillary steel pipe is continuously pressurized. When the hydraulic release pressure is reached, the release pin is cut off, the fishing head and the pipeline cutter remain in the well, and the continuous capillary steel pipe drives the rotary joint and the above parts to complete the recovery.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] The present invention applies pressure to the continuous capillary steel pipe at the wellhead, and the pressure is transmitted to the cutter cylinder through the rotary joint and the hydraulic release to push the cutter piston body downward, thereby driving the wedge-shaped push block to move downward. Under the push of the push block, the cutting head slides on the inclined surface of the push block and produces an outward displacement along the cutting back plate to cut off the wellbore pipe and cable in the outer pressure cap. The present invention can efficiently, accurately and safely complete the pipe and cable cutting task when the fixed pipe column construction such as measurement and adjustment, oxygen activation, and continuous capillary is stuck, thereby improving the efficiency of offshore oil production operations and effectively reducing the later processing costs and production losses; it avoids the problems of high cost and long time for single well operation on offshore mobile platforms in the prior art, saves operating costs, and can quickly resume production. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall construction principle of the present invention;

[0023] Figure 2 It is a schematic diagram of the cutting principle of the present invention;

[0024] Figure 3 It is a three-dimensional structural schematic diagram of the pipe and cable cutting device;

[0025] Figure 4 It is a schematic diagram of the side structure of the pipe and cable cutting device;

[0026] Figure 5 It is a front structural schematic diagram of the pipe and cable cutting device;

[0027] Figure 6is a schematic cross-sectional view of a pipe and cable cutting device;

[0028] Figure 7 It is a structural schematic diagram of a rotary joint;

[0029] Figure 8 This is a schematic diagram of the structure of the hydraulic release mechanism;

[0030] Fig. 9 It is a schematic diagram of the structure of the pipe cutter;

[0031] Fig.10 It is an enlarged schematic diagram of the cutting head and cutting back plate in the above figure;

[0032] In the figure above: continuous capillary steel pipe winch 1, first drum 2, first active retracting and releasing device 3, continuous capillary steel pipe 4, first day pulley 5, dual-channel sealing joint 6, high-pressure tee 7, pipe and cable cutting device 8, pipe and cable recovery winch 9, pipe and cable recovery 10, well-retaining pipe and cable 11, oil pipe 12, casing 13, second drum 14, second active retracting and releasing device 15, second day pulley 16, rotary joint 8.1, hydraulic release 8.2, pipeline cutter 8.3, counterweight 8.4;

[0033] Pressure cap 8.1.1, iron pad 8.1.2, rubber sealing pad 8.1.3, third sealing ring 8.1.4, upper pressure cap 8.1.5, sealing ferrule 8.1.6, retaining ring 8.1.7, lower pressure cap 8.1.8, upper shell 8.1.9, second pin 8.1.10, first sealing ring 8.1.11, first pin 8.1.12, body 8.1.13, rotary nipple 8.1.14, first rotary seal 8.1.15, connector 8.1.16, second rotary seal 8.1.17, lower shell 8.1.18, second sealing ring 8.1.19, lower joint 8.1.20;

[0034] Outer shell 8.2.1, lower sealing ring 8.2.2, upper sealing ring 8.2.3, release pin 8.2.4, fishing head 8.2.5;

[0035] Cutter piston body 8.3.1, connecting pin 8.3.2, push block 8.3.3, cutting head 8.3.4, shear nail 8.3.5, upper roller 8.3.6, cutting back plate 8.3.7, pressure cover 8.3.8, lower roller 8.3.9, connecting rod 8.3.10, housing 8.3.11, cutter cylinder 8.3.12, return spring 8.3.13;

[0036] Cutting head base 8.3.41, cutting head support handle 8.3.42, blade 8.3.43, cutting hole 8.3.44. DETAILED DESCRIPTION

[0037] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0038] Example 1, reference Figure 1-Figure 10 The present invention mentions an offshore platform continuous capillary steel pipe through oil pipe cable cutting device, comprising a continuous capillary steel pipe 4, a pipe cable cutting part and a pipe cable recovery part, wherein the pipe cable cutting part comprises a continuous capillary steel pipe winch 1, a first roller 2, a first active retracting device 3, a first pulley 5, a double-channel sealing joint 6, a high-pressure tee 7, and a pipe cable cutting device 8. The continuous capillary steel pipe winch 1 is equipped with a first roller 2 and a first active retracting device 3, one end of the continuous capillary steel pipe 4 is wound around the first roller 2 along the first pulley 5 and the first active retracting device 3 on the wellhead, and the continuous capillary steel pipe 4 is wound around the first roller 2. The other end of the pipe 4 is lowered into the inner cavity of the oil pipe 12 in the casing 13 along the double-channel sealing joint 6 and the high-pressure tee 7 of the wellhead, and is connected to the upper end of the pipe and cable cutting device 8, and the well-retained pipe and cable 11 passes through the pipe and cable cutting channel of the pipe and cable cutting device 8; the pipe and cable cutting device 8 comprises a rotary joint 8.1, a hydraulic release hand 8.2, a pipeline cutter 8.3 and a counterweight 8.4, the lower end of the pipeline cutter 8.3 is provided with a counterweight 8.4, the upper end of the pipeline cutter 8.3 is connected to the hydraulic release hand 8.2, the upper end of the hydraulic release hand 8.2 is connected to the rotary joint 8.1, and the upper end of the rotary joint 8.1 is connected to the continuous capillary steel pipe 4;

[0039] The umbilical cable recovery part includes an umbilical cable recovery winch 9, a umbilical cable recovery 10, a second drum 14, a second active retracting and releasing device 15, and a second pulley 16. The second drum 14 and the second active retracting and releasing device 15 are installed on the umbilical cable recovery winch 9. The lower end of the umbilical cable recovery 10 is connected to the well-retaining umbilical cable 11 of the oil pipe 12 as a whole. The upper end of the umbilical cable recovery 10 is wound around the second drum 14 along the second pulley 16 and the second active retracting and releasing device 15 on the wellhead.

[0040] Reference Figure 6 and Fig. 9The pipeline cutter 8.3 mentioned in the present invention comprises a cutter piston body 8.3.1, a push block 8.3.3, a cutting head 8.3.4, a cutting back plate 8.3.7, a gland 8.3.8, a connecting rod 8.3.10, a housing 8.3.11, a cutter cylinder 8.3.12, and a return spring 8.3.13. The upper part of the housing 8.3.11 is connected to the cutter cylinder 8.3.12, and the cutter piston body 8.3.1 is installed on the upper part of the inner cavity of the cutter cylinder 8.3.12. The cutter piston body 8.3. 1 is provided with a connecting rod 8.3.10 and a return spring 8.3.13, the lower end of the connecting rod 8.3.10 is connected to a push block 8.3.3, and the lower end of the push block 8.3.3 is slidably matched with a cutting head 8.3.4; a gland 8.3.8 is installed on the outer wall of the housing 8.3.11 to form a pipe and cable cutting channel, and a cutting back plate 8.3.7 is installed between the housing 8.3.11 and the gland 8.3.8, and the cutting head 8.3.4 moves outward along the cutting back plate 8.3.7 to complete the cutting of the well-retaining pipe and cable 11.

[0041] The push block 8.3.3 mentioned in the present invention is a wedge-shaped structure, and the push block 8.3.3 of the wedge-shaped structure moves downward, driving the cutting head 8.3.4 to move outward along the cutting back plate 8.3.7.

[0042] A shear nail 8.3.5 is installed between the connecting rod 8.3.10 and the inner wall of the shell 8.3.11, and the lower end of the connecting rod 8.3.10 is connected to the push block 8.3.3 through a connecting pin 8.3.2.

[0043] The pipe and cable cutting channel formed between the housing 8.3.11 and the gland 8.3.8 is provided with an upper roller 8.3.6 at the top and a lower roller 8.3.9 at the bottom, and the upper roller 8.3.6 and the lower roller 8.3.9 are in rolling cooperation with the pipe and cable 11.

[0044] Reference Figure 7The rotary joint 8.1 mentioned in the present invention includes a pressure cap 8.1.1, an iron pad 8.1.2, a rubber sealing pad 8.1.3, an upper pressure cap 8.1.5, a sealing sleeve 8.1.6, a retaining ring 8.1.7, a lower pressure cap 8.1.8, an upper shell 8.1.9, a first pin 8.1.12, a body 8.1.13, a rotary short section 8.1.14, a connector 8.1.16, a lower shell 8.1.18, and a lower joint 8.1.20. An iron pad 8.1.2 and a rubber sealing pad 8.1.3 are installed on the upper part of the inner cavity of the upper shell 8.1.9. The top of the upper shell 8.1.9 is connected to the pressure cap 8.1.1 through an internal thread. After the continuous capillary steel tube 4 passes through the upper shell 8.1.9, the iron pad 8.1.2 and the rubber sealing pad 8.1.3, the pressure cap 8.1.1 is tightened. The extruded iron pad 8.1.2 and the rubber sealing pad 8.1.3 play the role of multi-stage sealing; the lower part of the upper shell 8.1.9 is movably connected to the main body 8.1.13, and a first sealing ring 8.1.11 is arranged between the two. The inner cavity of the upper shell 8.1.9 is installed with an upper pressure cap 8.1.5, a sealing sleeve 8.1.6, a retaining ring 8.1.7 and a lower pressure cap 8.1.8; the lower part of the main body 8.1.13 is connected to the lower shell 8.1.18, and a connector 8.1.16 is installed in the lower shell 8.1.18. A rotating short section 8.1.14 is arranged between the connector 8.1.16 and the main body 8.1.13. The lower end of the connector 8.1.16 is connected to the lower joint 8.1.20 by a first pin 8.1.12, and a second sealing ring 8.1.19 is installed between the two.

[0045] Among them, one or more first rotary seals 8.1.15 are arranged between the above-mentioned rotary short section 8.1.14 and the connector 8.1.16, and a second rotary seal 8.1.17 is arranged between the middle part of the connector 8.1.16 and the lower shell 8.1.18; the main body 8.1.13 is connected to the upper shell 8.1.9 and the lower shell 8.1.18 respectively through the second pin 8.1.10.

[0046] Reference Figure 8 The hydraulic release 8.2 mentioned in the present invention comprises an outer shell 8.2.1, a lower sealing ring 8.2.2, an upper sealing ring 8.2.3, a release pin 8.2.4, and a fishing head 8.2.5. The upper part of the outer shell 8.2.1 is connected to the lower joint 8.1.20 of the rotary joint 8.1, and a third sealing ring 8.1.4 is arranged between the two. The lower part of the outer shell 8.2.1 is connected to the upper part of the fishing head 8.2.5. The release pin 8.2.4 is installed between the outer shell 8.2.1 and the fishing head 8.2.5, and an upper sealing ring 8.2.3 is arranged between the outer shell 8.2.1 and the fishing head 8.2.5. The lower end of the fishing head 8.2.5 is movably connected to the upper end of the pipeline cutter 8.3, and a lower sealing ring 8.2.2 is arranged between the fishing head 8.2.5 and the pipeline cutter 8.3.

[0047] Reference Fig.10 The cutting head 8.3.4 mentioned in the present invention includes a head base 8.3.41, a head support handle 8.3.42 and a blade 8.3.43. The outer side of the head base 8.3.41 is provided with a protrusion that slides with a groove provided on the inclined surface of the push block 8.3.3. The inner side of the head base 8.3.41 is fixed with the head support handle 8.3.42, and the outer end of the head support handle 8.3.42 is fixed with the blade 8.3.43. The blade 8.3.43 moves along the cutting hole 8.3.44 on the upper part of the cutting back plate 8.3.7 to cut and disconnect the well-retaining cable 11; and the thickness of the head support handle 8.3.42 is greater than the inner diameter of the cutting hole 8.3.44, so that the head support handle 8.3.42 can play a limiting role to prevent the cutting head 8.3.4 from falling off.

[0048] The method for using the offshore platform continuous capillary steel pipe through oil pipe and cable cutting device mentioned in the present invention comprises the following process:

[0049] 1. First, the continuous capillary steel tube 4 passes through the pressure cap 8.1.1, the iron pad 8.1.2, the rubber sealing gasket 8.1.3, the upper shell 8.1.9, the upper pressure cap 8.1.5, the lower pressure cap 8.1.8 and the sealing sleeve 8.1.6, and is inserted into the top through hole of the body 8.1.13. First tighten the lower pressure cap 8.1.8, then tighten the upper pressure cap 8.1.5, and after the upper shell 8.1.9 is threadedly connected with the upper part of the body 8.1.13, the continuous capillary steel tube 4 is pressurized. After the air is discharged from the upper end of the pressure cap 8.1.1, tighten the pressure cap 8.1.1 to complete the installation of the continuous capillary steel tube 4;

[0050] 2. Pressurize the continuous capillary steel pipe 4 at the wellhead. The pressure is transmitted to the cutter cylinder 8.3.12 through the rotary joint 8.1 and the hydraulic release 8.2 to push the cutter piston body 8.3.1 downward, thereby driving the wedge-shaped push block 8.3.3 to move downward. Under the push of the wedge-shaped push block 8.3.3, the cutting head 8.3.4 slides on the inclined surface of the wedge-shaped push block 8.3.3 and moves outward along the cutting back plate 8.3.7 to cut off the well-retaining pipe 11 in the outer gland 8.3.8. Specific pressure control: when the pressure slowly increases to 3700psi, the pressure suddenly drops to 2600psi, and it is judged that the well-retaining pipe 11 has been cut off. When it continues to slowly increase to 3000psi, the pressure slowly rises. The pressure is continuously pressed until the pressure suddenly increases to 3700psi, and then the pressure is stopped.

[0051] After the cutting head 8.3.4 cuts the well-retaining cable 11, the recovery cable 10 is located above and is lifted out of the wellhead by the recovery cable winch 9; then, the continuous capillary steel pipe 4 is depressurized, and the cutter piston body 8.3.1 moves upward under the elastic force of the return spring 8.3.13, driving the wedge-shaped push block 8.3.3 and the cutting head 8.3.4 back to the initial position;

[0052] 3. When the pipeline cutter 8.3 is stuck and cannot be recovered, the continuous capillary steel pipe 4 is continuously pressurized. When the release pressure of the hydraulic release 8.2 is reached, the release pin 8.2.4 is cut off, the fishing head 8.2.5 and the pipeline cutter 8.3 remain in the well, and the continuous capillary steel pipe 4 drives the rotary joint 8.1 and the above parts to complete the recovery.

[0053] The present invention can efficiently, accurately and safely complete the task of cutting pipes and cables when a fixed pipe string such as measurement and adjustment, oxygen activation, and continuous capillary is stuck, thereby improving the efficiency of offshore oil production operations and effectively reducing later processing costs and production losses. It avoids the problems of high cost and long time for single well operations on offshore mobile platforms in the prior art, in which the cost of each single well exceeds 5 million yuan and the operation cycle is about 10 days. However, by adopting the construction method of the present invention, the operation cycle is only 3 days and the operation cost is about 200,000 yuan, which saves the operation cost and can quickly resume production.

[0054] The above are only some preferred embodiments of the present invention. Any person skilled in the art may modify the above technical solutions or modify them into equivalent technical solutions. Therefore, the corresponding simple modifications or equivalent transformations made according to the technical solutions of the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A device for cutting a continuous capillary steel pipe through an oil pipe or cable on an offshore platform, comprising a continuous capillary steel pipe (4), characterized in that: It also includes a pipe and cable cutting part and a pipe and cable recovery part. The pipe and cable cutting part includes a continuous capillary steel pipe winch (1), a first roller (2), a first active retracting and releasing device (3), a first pulley (5), a dual-channel sealing joint (6), a high-pressure tee (7), and a pipe and cable cutting device (8). The first roller (2) and the first active retracting and releasing device (3) are installed on the continuous capillary steel pipe winch (1). One end of the continuous capillary steel pipe (4) is wound around the first roller (2) along the first pulley (5) and the first active retracting and releasing device (3) on the wellhead. The other end of the continuous capillary steel pipe (4) is wound around the first roller (2) along the dual-channel sealing joint (6) on the wellhead. and a high-pressure tee (7) are lowered into the inner cavity of the oil pipe (12) and connected to the upper end of the pipe and cable cutting device (8), and the well-retained pipe and cable (11) passes through the pipe and cable cutting channel of the pipe and cable cutting device (8); the pipe and cable cutting device (8) comprises a rotary joint (8.1), a hydraulic release hand (8.2), a pipe cutter (8.3) and a counterweight (8.4); the counterweight (8.4) is arranged at the lower end of the pipe cutter (8.3), the upper end of the pipe cutter (8.3) is connected to the hydraulic release hand (8.2), the upper end of the hydraulic release hand (8.2) is connected to the rotary joint (8.1), and the upper end of the rotary joint (8.1) is connected to the continuous capillary steel pipe (4); The umbilical cable recovery part comprises an umbilical cable recovery winch (9), a umbilical cable recovery (10), a second drum (14), a second active retracting and releasing device (15), and a second pulley (16); the second drum (14) and the second active retracting and releasing device (15) are installed on the umbilical cable recovery winch (9); the lower end of the umbilical cable recovery (10) is connected to the well-retaining umbilical cable (11) of the oil pipe (12) as a whole; and the upper end of the umbilical cable recovery (10) is wound around the second drum (14) along the second pulley (16) and the second active retracting and releasing device (15) on the wellhead; The pipeline cutter (8.3) comprises a cutter piston body (8.3.1), a push block (8.3.3), a cutting head (8.3.4), a cutting back plate (8.3.7), a gland (8.3.8), a connecting rod (8.3.10), a housing (8.3.11), a cutter cylinder (8.3.12), and a return spring (8.3.13). The upper part of the housing (8.3.11) is connected to the cutter cylinder (8.3.12), and the cutter piston body (8.3.1) is installed on the upper part of the inner cavity of the cutter cylinder (8.3.12). The cutter piston body (8.3.1) A connecting rod (8.3.10) and a return spring (8.3.13) are arranged at the lower part, the lower end of the connecting rod (8.3.10) is connected to a push block (8.3.3), and the lower end of the push block (8.3.3) is slidably matched with a cutting head (8.3.4); a gland (8.3.8) is installed on the outer wall of the housing (8.3.11) to form a pipe and cable cutting channel, a cutting back plate (8.3.7) is installed between the housing (8.3.11) and the gland (8.3.8), and the cutting head (8.3.4) moves outward along the cutting back plate (8.3.7) to complete the cutting of the well-retaining pipe and cable (11).

2. The offshore platform continuous capillary steel pipe through oil pipe cable cutting device according to claim 1 is characterized by: The push block (8.3.3) is a wedge-shaped structure, and the push block (8.3.3) with the wedge-shaped structure moves downward, driving the cutting head (8.3.4) to move outward along the cutting back plate (8.3.7).

3. The offshore platform continuous capillary steel pipe through oil pipe cable cutting device according to claim 2 is characterized by: A shear nail (8.3.5) is installed between the connecting rod (8.3.10) and the inner wall of the housing (8.3.11), and the lower end of the connecting rod (8.3.10) is connected to the push block (8.3.3) via a connecting pin (8.3.2).

4. The offshore platform continuous capillary steel pipe through oil pipe cable cutting device according to claim 3 is characterized by: The pipe and cable cutting channel formed between the housing (8.3.11) and the gland (8.3.8) is provided with an upper roller (8.3.6) at the top and a lower roller (8.3.9) at the bottom, and the upper roller (8.3.6) and the lower roller (8.3.9) are in rolling cooperation with the well-retaining pipe and cable (11).

5. The offshore platform continuous capillary steel pipe through oil pipe cable cutting device according to claim 4 is characterized by: The rotary joint (8.1) comprises a pressure cap (8.1.1), an iron pad (8.1.2), a rubber sealing pad (8.1.3), an upper pressure cap (8.1.5), a sealing sleeve (8.1.6), a retaining ring (8.1.7), a lower pressure cap (8.1.8), an upper shell (8.1.9), a first pin (8.1.12), a body (8.1.13), a rotary short section (8.1.14), a connector (8.1.16), a lower shell (8.1.18), and a lower joint (8.1.20). An iron pad (8.1.20) is arranged on the upper part of the inner cavity of the upper shell (8.1.9). 8.1.2) and rubber sealing gasket (8.1.3), the top of the upper shell (8.1.9) is connected to the pressure cap (8.1.1) through an internal thread, and the continuous capillary steel tube (4) passes through the upper shell (8.1.9), the iron pad (8.1.2) and the rubber sealing gasket (8.1.3), and then the pressure cap ( 8.1.1) The extruded iron pad (8.1.2) and the rubber sealing pad (8.1.3) play a role of multi-stage sealing; the lower part of the upper shell (8.1.9) is movably connected to the main body (8.1.13), and the inner cavity of the upper shell (8.1.9) is installed with an upper pressure cap (8.1.5), a sealing sleeve (8.1.6), a retaining ring (8.1.7) and a lower pressure cap (8.1.8); the lower part of the main body (8.1.13) is connected to the lower shell (8.1.18), and a connecting body (8.1.16) is installed in the lower shell (8.1.18). A rotating short section (8.1.14) is installed between the connecting body (8.1.16) and the main body (8.1.13), and the lower end of the connecting body (8.1.16) is connected to the lower joint (8.1.20) through a first pin (8.1.12).

6. The offshore platform continuous capillary steel pipe through oil pipe cable cutting device according to claim 5 is characterized by: One or more first rotary seals (8.1.15) are provided between the rotary short section (8.1.14) and the connecting body (8.1.16), and a second rotary seal (8.1.17) is provided between the middle portion of the connecting body (8.1.16) and the lower shell (8.1.18); the main body (8.1.13) is connected to the upper shell (8.1.9) and the lower shell (8.1.18) respectively via second pins (8.1.10).

7. The offshore platform continuous capillary steel pipe through oil pipe cable cutting device according to claim 6 is characterized by: The hydraulic release device (8.2) comprises an outer shell (8.2.1), a lower sealing ring (8.2.2), an upper sealing ring (8.2.3), a release pin (8.2.4), and a salvage head (8.2.5). The upper part of the outer shell (8.2.1) is connected to the lower joint (8.1.20) of the rotary joint (8.1), the lower part of the outer shell (8.2.1) is connected to the upper part of the salvage head (8.2.5), and the outer shell (8.2.1) is connected to the lower joint (8.1.20) of the rotary joint (8.1). A release pin (8.2.4) is installed between the outer body (8.2.1) and the salvage head (8.2.5), and an upper sealing ring (8.2.3) is provided between the outer body (8.2.1) and the salvage head (8.2.5); the lower end of the salvage head (8.2.5) is movably connected to the upper end of the pipeline cutter (8.3), and a lower sealing ring (8.2.2) is provided between the salvage head (8.2.5) and the pipeline cutter (8.3).

8. The offshore platform continuous capillary steel pipe through oil pipe cable cutting device according to claim 7 is characterized by: The cutting head (8.3.4) comprises a head base (8.3.41), a head support handle (8.3.42) and a blade (8.3.43); a protrusion is provided on the outer side of the head base (8.3.41) and is slidably matched with a groove provided on the inclined surface of the push block (8.3.3); the head support handle (8.3.42) is fixed on the inner side of the head base (8.3.41); the blade (8.3.43) is fixed on the outer end of the head support handle (8.3.42); the blade (8.3.43) moves along the cutting hole (8.3.44) on the upper part of the cutting back plate (8.3.7) to cut and disconnect the well-retaining pipe cable (11).

9. The method for using the offshore platform continuous capillary steel pipe through oil pipe cable cutting device according to claim 8 is characterized by: The process includes:

1. First, the continuous capillary steel tube (4) passes through the pressure cap (8.1.1), iron pad (8.1.2), rubber sealing gasket (8.1.3), upper shell (8.1.9), upper pressure cap (8.1.5), lower pressure cap (8.1.8) and sealing ferrule (8.1.6), and is inserted into the body ( 8.1.13) In the top through hole, tighten the lower pressure cap first ( 8.1.8), and then tighten the upper pressure cap ( 8.1.5), after the upper shell (8.1.9) is connected to the upper part of the main body (8.1.13) by threaded connection, pressurize the continuous capillary steel tube (4), and after the air is discharged from the upper end of the pressure cap (8.1.1), tighten the pressure cap ( 8.1.1) Complete the installation of the continuous capillary steel tube (4); 2. Pressurize the continuous capillary steel pipe (4) at the wellhead. The pressure is transmitted to the cutter hydraulic cylinder (8.3.12) through the rotary joint (8.1) and the hydraulic release (8.2), pushing the cutter piston body (8.3.1) downward, thereby driving the wedge-shaped push block (8.3.3) to move downward. Under the push of the wedge-shaped push block (8.3.3), the cutting head (8.3.4) slides on the inclined surface of the wedge-shaped push block (8.3.3) and moves outward along the cutting back plate (8.3.7), cutting off the well-retaining pipe cable (11) in the outer gland (8.3.8); After the cutting head (8.3.4) cuts the well-retaining cable (11), the recovery cable (10) is located above and is lifted out of the wellhead by the recovery cable winch (9); then, the continuous capillary steel pipe (4) is depressurized, and the cutter piston body (8.3.1) moves upward under the elastic force of the return spring (8.3.13), driving the wedge-shaped push block (8.3.3) and the cutting head (8.3.4) back to the initial position; 3. When the pipeline cutter (8.3) is stuck and cannot be recovered, the continuous capillary steel pipe (4) is continuously pressurized. When the release pressure of the hydraulic release (8.2) is reached, the release pin (8.2.4) is cut off, and the fishing head (8.2.5) and the pipeline cutter (8.3) remain in the well. The continuous capillary steel pipe (4) drives the rotary joint (8.1) and the above parts to complete the recovery.

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