Construction method for treating gas well oil pipe failure inner plugging tool under pressure

Abstract

The invention relates to the technical field of underground operation in the field of petroleum and natural gas development, in particular to a construction method of an internal plugging tool for treating gas well oil pipe failure under pressure, which comprises the following steps of: plugging an oil pipe above the internal plugging tool through an oil pipe bridge plug, and pulling out the plugged oil pipe to a bridge plug setting position by using equipment under pressure; the failure inner plugging tool is pulled out in an under-pressure reverse buckling mode, then an oil pipe reversely opened in an original well is connected in an under-pressure opposite buckling mode, secondary plugging is carried out, and a well completion oil pipe is put down. By means of the construction method, the purpose of completing well repair without well killing after the plugging tool in the oil pipe of the oil and gas well fails is achieved, the original productivity of the stratum can be kept, the well killing cost is saved, the cost is reduced, and the effect of improving the oil and gas recovery rate is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of downhole operations in the field of petroleum and natural gas development, and in particular to a construction method of a pressure-treated gas well oil pipe failure internal plugging tool. Background Art

[0002] In recent years, gas well production wells have pre-installed downhole plugging tools such as chokes for pressure reduction and throttling production. After a period of production, some wells have experienced choke erosion, plugging failure, etc., and cannot produce normally. Failed chokes are often stuck, the fishing diameter is skewed and deformed, pulled off, or buried in sand, and cannot be effectively fished out by steel wire or coiled tubing operations. Summary of the invention

[0003] In order to solve the above technical problems, the present invention proposes a construction method for treating a failed internal plugging tool of a gas well oil pipe under pressure. By treating the internal plugging tool under pressure, the purpose of completing the well repair without well pressure reduction after the internal plugging tool of the oil and gas well oil pipe fails is achieved. It can not only maintain the original production capacity of the formation, save the well pressure fee, reduce the cost, but also achieve the effect of improving the oil and gas recovery rate.

[0004] The present invention is achieved by adopting the following technical solutions: A construction method for a tool for processing a failed internal plugging of a gas well oil pipe under pressure, comprising the following steps: S1. Pipeline plugging: Place the pipe bridge plug on the upper part of the internal plugging tool to the preset position; S2. Installation of pressurized equipment; S3. Lifting the original well tubing: After the original well tubing is successfully lifted, the drill is pulled to the bridge plug setting position; S4. Pressurized inversion: pour out the tubing containing the internal plugging tool and tubing bridge plug, and remove the failed internal plugging tool; S5. Pressurized caulking: Caulking the caulking tubing equipped with the caulking centralizer with the tubing that was reversed in the original well; S6. Secondary plugging in the pipe; S7. Lower the completion tubing.

[0005] The step S2 specifically refers to: installing the full-bore flat valve, the slip blowout preventer, the drainage spool, the safety blowout preventer and the pressure working device in sequence from bottom to top; the pressure working device includes a mobile slip group, a rotary table, a fixed load-bearing slip, an annular blowout preventer, an upper working gate, a pressure relief valve and a lower working gate.

[0006] The safety blowout preventer is sequentially installed with a first half-sealed gate, a full-sealed gate and a shear gate from top to bottom; the slip blowout preventer is sequentially installed with a second half-sealed gate and a slip gate from top to bottom.

[0007] The undercut with pressure in step S4 specifically refers to: According to the position of the bridge plug, drill until the oil pipe coupling of the plugged bridge plug is below the upper working gate, close the lower working gate, and after the pressure is released to the design pressure, open the upper working gate, continue to drill until the lower end of the oil pipe containing the internal plugging tool is located on the table surface of the pressurized operating device, loosen the oil pipe, lower the loosened oil pipe until the coupling is above the lower working gate, close the upper working gate, balance the pressure in the pressurized chamber, and then open the lower working gate, lower the coupling to between the slip gate and the full-sealing gate, close the fixed load-bearing slip and install the safety slip to ensure that the safety slip is securely fixed, open the fixed load-bearing slip, and close the slip gate; start reverse buckling. After the reverse buckling is successful, lift the reversed oil pipe above the full-sealing gate, close the full-sealing gate, release the pressure step by step to confirm that there is no pressure above the full-sealing gate, open the upper working gate, annular blowout preventer and slip gate, then pull out the reversed oil pipe, take out the internal plugging tool and the plugged bridge plug.

[0008] The step S4 of loosening the oil pipe specifically refers to: using hydraulic pliers to loosen the oil pipe by 0.5-1 thread.

[0009] The step S4 of starting to reversely tighten specifically refers to: firstly lowering the turntable pressure, controlling the turntable speed to be no more than 1 rpm, slowly increasing the turntable pressure until the oil pipe starts to rotate, loosening it for 3 turns when reverse tightening, and continuing to rotate it for 5-7 turns after the pressure is balanced to complete the reverse tightening.

[0010] The method for judging whether the inverted connection is successful in step S4 is as follows: lift the oil pipe to verify the pressure relief. If the pressure can be restored instantly, it is basically judged that the oil pipe is inverted. Then, a trial lift is performed to verify the inverted connection by 5-10cm. If the hanging weight does not increase, it is judged that the inverted connection is successful.

[0011] The belt pressing buckle in step S5 specifically refers to: Connect the butt-jointed tubing with a centralizer and a full-bore tubing cock. After calculating the top force on the tubing, lower the butt-jointed tubing to above the fully sealed gate, close the movable slip group and the annular blowout preventer, and complete the pressure balance in the pressurized chamber. Close the upper working gate, open the fully sealed gate, and lower the butt-jointed tubing under pressure to make it contact with the inverted tubing on the slip blowout preventer in the original well. Install safety slips, ensure that the safety slips are securely fixed, and then start the pressurized butt-jointing. After the butt-jointing is completed, release the chamber pressure step by step. After passing the test, balance the pressure in the pressurized chamber again, and try to lift the tubing until the butt-jointing is successful.

[0012] Starting the belt pressure buckle in step S5 specifically refers to: starting the turntable to start the belt pressure buckle until the buckle torque reaches a preset value.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In the present invention, after the internal plugging tool, such as the oil pipe above the choke, is plugged by the bridge plug, the plugging oil pipe is pulled out to the bridge plug setting position by using a pressure operation device, and the failed choke is pulled out by a pressure reverse buckle method, and then the oil pipe in the well is connected by a pressure buckle method, and a secondary plugging is implemented, and the well completion oil pipe is lowered to complete the treatment of the failed choke. Through this construction method, the purpose of completing the well repair without well pressure after the plugging tool inside the oil pipe of the oil and gas well fails is achieved, which can not only maintain the original production capacity of the formation, save well pressure costs, reduce costs, but also achieve the effect of improving the oil and gas recovery rate.

[0014] 2. In the present invention, the failed internal plugging tool and the oil pipe where it is located are removed and replaced with a new oil pipe. On the one hand, the problem can be 100% solved. On the other hand, removing and replacing the oil pipe is a permanent solution and will not cause hidden dangers to the next construction or the later production of the wellbore.

[0015] 3. By using the pressure-bearing undercut and pressure-bearing double-cut in the present invention, it is also possible to treat oil pipes with corrosion and perforation and pipe columns with throttles buried in sand.

[0016] 4. During the process of pressure-bearing inverted buckle and pressure-bearing double buckle, safety slips need to be installed to absolutely ensure the safety of the construction work and avoid accidents during construction.

[0017] 5. In the present invention, a fastening centralizer is used to ensure that the oil pipe thread will not be damaged during the pressure fastening, and the fastening operation can be completed quickly and effectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, wherein: Figure 1 It is a structural schematic diagram of the present invention; Markings in the figure: 1. Oil pipe, 2. Full-bore flat valve, 3. Slip blowout preventer, 4. Drain spool, 5. Safety blowout preventer, 6. Mobile slip group, 7. Turntable, 8. Fixed load-bearing slip, 9. Annular blowout preventer, 10. Upper working gate, 11. Lower working gate, 12. First half-sealing gate, 13. Full-sealing gate, 14. Shear gate, 15. Second half-sealing gate, 16. Slip gate, 17. Internal plugging tool, 18. Oil pipe bridge plug. DETAILED DESCRIPTION

[0019] Example 1 As a basic embodiment of the present invention, the present invention includes a construction method for a pressure-treated gas well oil pipe failure internal plugging tool, comprising the following steps: S1. Pipeline plugging: The position of the internal plugging tool in the oil pipe 1 is found by wireline drilling, and the oil pipe bridge plug 18 is placed on the upper part of the internal plugging tool 17 to a preset position.

[0020] S2. Installation of pressurized equipment.

[0021] S3. Lifting the original well tubing 1: After the original well tubing 1 is successfully lifted, the drill is pulled to the bridge plug seating position.

[0022] S4. Pressurized inversion: pour out the oil pipe 1 containing the inner plugging tool 17 and the oil pipe bridge plug 18, and take out the failed inner plugging tool 17.

[0023] S5. Pressure-connected fastening: Fasten the fastening tubing equipped with the fastening centralizer to the tubing 1 that was reversed in the original well.

[0024] S6. Secondary plugging inside the pipe: After the remaining oil pipe 1 in the well passes the well cleaning test, a second plugging operation is performed inside the oil pipe 1 using a pipe bridge plug.

[0025] S7. Lower the completion tubing: Lower the completion tubing to the designed position, install the tubing hanger, and complete the well.

[0026] Example 2 As a preferred embodiment of the present invention, the present invention includes a construction method for a pressure-treated gas well oil pipe failure internal plugging tool, comprising the following steps: S1. Pipeline plugging: Place the pipe bridge plug 18 on the upper part of the inner plugging tool 17 to the preset position. The preset position refers to the position 2 to 3 cm away from the inner plugging tool 17.

[0027] S2. Installation of pressurized equipment: Install the full-bore flat valve 2, slip blowout preventer 3, drain spool 4, safety blowout preventer 5 and pressurized operation device in order from bottom to top. The pressurized operation device includes a mobile slip group 6, a rotary table 7, a fixed load-bearing slip 8, an annular blowout preventer 9, an upper working gate 10, a pressure relief valve and a lower working gate 11.

[0028] S3. Lifting the original well tubing 1: After the original well tubing 1 is successfully lifted, the drill is pulled to the bridge plug seating position.

[0029] S4. Pressurized inversion: pour out the oil pipe 1 containing the inner plugging tool 17 and the oil pipe bridge plug 18, and remove the invalid inner plugging tool 17. Specifically, the following steps are included: According to the bridge plug setting position, drill until the coupling of the plugged bridge plug oil pipe 1 is located below the upper working gate 10, close the lower working gate 11, and after the pressure is relieved to the design pressure, open the upper working gate 10, continue to drill until the lower end of the oil pipe 1 containing the internal plugging tool 17 is located on the table plane of the pressurized working device, loosen the oil pipe 1, lower the loosened oil pipe 1 until the coupling is located above the lower working gate 11, close the upper working gate 10, balance the pressure in the pressurized chamber, then open the lower working gate 11, lower the coupling to between the slip gate 16 of the slip blowout preventer 3 and the full-sealing gate 13 of the safety blowout preventer 5, close the fixed load-bearing slip 8 and install the safety slip, ensure that the safety slip is securely fixed, open the fixed load-bearing slip 8, and close the slip gate 16 of the slip blowout preventer 3. Start reverse turning. After reverse turning is successful, lift the reversed oil pipe 1 to above the fully sealed gate 13 of the safety blowout preventer 5, close the fully sealed gate 13 of the safety blowout preventer 5, release the pressure step by step to confirm that there is no pressure above the fully sealed gate 13, open the upper working gate 10, the annular blowout preventer 9 and the slip gate 16, then lift out the reversed oil pipe 1, and take out the internal plugging tool 17 and the plugging bridge plug.

[0030] S5. Pressurized fastening: fasten the fastening tubing equipped with the fastening centralizer to the tubing 1 that was reversed in the original well. Specifically, the following steps are included: Connect the butt-jointed tubing with a butt-jointed centralizer and a full-bore tubing cock. According to the top force on the tubing 1, lower the butt-jointed tubing to above the fully sealed gate 13, close the movable slip group 6 and the annular blowout preventer 9, and after completing the pressure balance in the pressurized chamber, close the upper working gate 10, open the fully sealed gate 13 of the safety blowout preventer 5, lower the butt-jointed tubing under pressure to make it contact with the tubing 1 opened on the slip blowout preventer 3 in the original well, install the safety slip, ensure that the safety slip is securely fixed, and then start the butt-jointed under pressure. After the butt-jointed is completed, the chamber pressure is gradually released. After passing the test, the pressure in the pressurized chamber is balanced again, and the tubing 1 is tried to be lifted until the butt-jointed is successful.

[0031] S6. Secondary sealing inside the pipe.

[0032] S7. Lower the completion tubing.

[0033] Example 3 As the best embodiment of the present invention, the present invention includes a construction method for a pressure treatment gas well oil pipe failure internal plugging tool. 3 / 8"~3 1 Take / 2" oil pipe as an example, the specific steps include: S1. Pipeline plugging: Use steel wire to find out the position of the pipe plugging tool 17, and place the pipe bridge plug 18 to the preset position on the upper part of the inner plugging tool 17. In this embodiment, the inner plugging tool 17 is specifically a choke, and the pipe bridge plug 18 can be placed in the area 2-3 cm above the choke.

[0034] S2. Install the pressurized equipment. Refer to the attached manual. Figure 1 , from bottom to top, a full-bore flat valve 2, a slip blowout preventer 3, a liquid discharge spool 4, a safety blowout preventer 5 and a pressure-operated device are sequentially installed. The pressure-operated device includes a mobile slip group 6, a rotary table 7, a fixed load-bearing slip 8, an annular blowout preventer 9, an upper working gate 10, a pressure relief valve and a lower working gate 11. The safety blowout preventer 5 is sequentially installed with a first half-sealed gate 12, a full-sealed gate 13 and a shear gate 14 from top to bottom; the slip blowout preventer 3 is sequentially installed with a second half-sealed gate 15 and a slip gate 16 from top to bottom.

[0035] S3. Lifting the original well tubing 1: After the original well tubing 1 is successfully lifted, the drill is pulled to the bridge plug seating position.

[0036] S4. Pressurized inversion: pour out the oil pipe 1 containing the internal plugging tool 17 and the oil pipe bridge plug 18, and remove the failed internal plugging tool 17. Specifically, the following steps are included: According to the sealing position of the bridge plug, drill until the coupling of the sealing bridge plug oil pipe 1 is located below the upper working gate 10, close the lower working gate 11, use the pressure relief valve located between the upper working gate 10 and the lower working gate 11 to release the pressure to the design pressure, open the upper working gate 10, continue to drill until the lower end of the oil pipe 1 containing the throttle is located on the table plane of the pressurized working device, use hydraulic pliers to loosen the oil pipe 1 by 0.5-1 turns, lower the loosened oil pipe 1 until the coupling is above the lower working gate 11, close the upper working gate 10, balance the pressure in the pressurized chamber, then open the lower working gate 11, lower the coupling to between the slip gate 16 and the full sealing gate 13, close the fixed load-bearing slip 8 and install the safety slip, ensure that the safety slip is securely fixed, open the fixed load-bearing slip 8, and close the slip gate 16. At this time, start the turntable 7 to reverse. First, lower the pressure of the turntable 7, control the speed of the turntable 7 to be no more than 1 rpm, and slowly increase the pressure of the turntable 7 until the oil pipe 1 starts to rotate. When reversed, loosen it for 3 turns first, and continue to rotate 5-7 turns after the pressure is balanced to complete the reverse. Then, slowly lift the oil pipe about 2 cm to verify the pressure relief. If the pressure can be restored instantly, it is basically judged that the oil pipe 1 is reversed, and then conduct a trial lift verification, slowly try to lift 5-10 cm, if the hanging weight does not rise, it is judged that the reverse is successful. After the reverse is successful, lift the reversed oil pipe 1 to above the full-sealed gate 13, close the full-sealed gate 13, release the pressure step by step to confirm that there is no pressure above the full-sealed gate 13, open the upper working gate 10, the annular blowout preventer 9 and the slip gate 16, then lift the reversed oil pipe 1, and remove the failed throttle and the oil pipe bridge plug 18.

[0037] S5. Pressurized caulking: Caulk the caulking tubing equipped with the caulking centralizer with the tubing 1 that was reversed in the original well. The specific steps include: Connect the butt-jointed centralizer and the full-bore tubing cock to the butt-jointed tubing. After calculating the top force on the tubing 1, lower the butt-jointed tubing to above the full-sealed gate 13, close the movable slip group 6 and the annular blowout preventer 9, and complete the pressure balance in the pressurized chamber. Close the upper working gate 10, open the full-sealed gate 13, and lower the butt-jointed tubing under pressure to make it contact with the inverted tubing 1 on the slip blowout preventer 3 in the original well. Install the safety slips, ensure that the safety slips are fixed reliably, set the corresponding parameters, and set the turntable 7 to start or stop. Start the turntable 7 to start the pressurized butt-jointed, for example, 2 3 The make-up torque of the / 8″ thickened oil pipe 1 reaches 2450N·m, and the make-up number of circles is 8 to complete the make-up. After the make-up is completed, the chamber pressure is gradually released. If the pressure does not increase, it is qualified. After passing the test, the pressure in the pressurized chamber is balanced again, and the oil pipe 1 is tried to be lifted. If the hanging weight increases, it means that the make-up is successful.

[0038] S6. Secondary plugging inside the pipe: After the remaining oil pipe 1 in the well passes the well cleaning test, a secondary plugging of the pipe is performed using a pipe bridge plug.

[0039] S7. Lower the completion tubing. Lower the completion tubing to the designed position, install the tubing hanger, and complete the well.

[0040] In summary, after reading the present invention document, ordinary technicians in this field can make various other corresponding transformation schemes based on the technical scheme and technical concept of the present invention without creative mental labor, which all fall within the scope of protection of the present invention.

Claims

1. A construction method for a tool for sealing a failed internal plugging of a gas well oil pipe under pressure, characterized in that: The following steps are involved: S1. Pipe plugging: placing a pipe bridge plug (18) on the upper part of the inner plugging tool (17) to a preset position; S2. Installation of pressurized equipment; S3. Lifting the original well tubing (1): After the original well tubing (1) is successfully lifted, the drill is pulled to the bridge plug setting position; S4. Pressurized inverted buckle: pour out the tubing (1) containing the inner plugging tool (17) and the tubing bridge plug (18), and remove the failed inner plugging tool (17); S5. Pressurized fastening: Fasten the fastening tubing equipped with the fastening centralizer to the tubing (1) in the original well; S6. Secondary plugging in the pipe; S7. Lower the completion tubing.

2. The construction method of a tool for sealing the failed internal part of a gas well oil pipe under pressure treatment according to claim 1, characterized in that: The step S2 specifically comprises: installing, from bottom to top, a full-bore flat plate valve (2), a slip blowout preventer (3), a liquid discharge spool (4), a safety blowout preventer (5), and a pressure-operated device in sequence; the pressure-operated device comprises a movable slip group (6), a rotary table (7), a fixed load-bearing slip (8), an annular blowout preventer (9), an upper working gate (10), a pressure relief valve, and a lower working gate (11).

3. The construction method of a tool for sealing the failed internal part of a gas well oil pipe under pressure treatment according to claim 2, characterized in that: The safety blowout preventer (5) is provided with a first half-sealed gate (12), a full-sealed gate (13) and a shear gate (14) in sequence from top to bottom; the slip blowout preventer (3) is provided with a second half-sealed gate (15) and a slip gate (16) in sequence from top to bottom.

4. The construction method of a tool for sealing the failed internal part of a gas well oil pipe under pressure treatment according to claim 3 is characterized by: The undercut with pressure in step S4 specifically refers to: According to the bridge plug setting position, the drill is pulled up until the coupling of the plugging bridge plug setting oil pipe (1) is located below the upper working gate (10), the lower working gate (11) is closed, the pressure is released to the design pressure, the upper working gate (10) is opened, and the drill is continued to be pulled up until the lower end of the oil pipe (1) containing the internal plugging tool (17) is located on the table surface of the pressurized working device, the oil pipe (1) is loosened, and the loosened oil pipe (1) is lowered until the coupling is located above the lower working gate (11), the upper working gate (10) is closed, the pressure in the pressurized chamber is balanced, and then the lower working gate (11) is opened and the coupling is lowered to the slip gate ( After the fixed load-bearing slip (8) is closed and the safety slip is installed between the fully sealed gate (16) and the fully sealed gate (13), the fixed load-bearing slip (8) is closed and the slip gate (16) is installed. After ensuring that the safety slip is securely fixed, the fixed load-bearing slip (8) is opened and the slip gate (16) is closed. The reversed oil pipe (1) is lifted to above the fully sealed gate (13) after the reversed oil pipe (1) is successfully lifted. The fully sealed gate (13) is closed and the pressure is gradually relieved to confirm that there is no pressure above the fully sealed gate (13). Then, the upper working gate (10), the annular blowout preventer (9) and the slip gate (16) are opened, and then the reversed oil pipe (1) is lifted and the internal plugging tool (17) and the plugging bridge plug are taken out.

5. The construction method of a tool for sealing the failed internal part of a gas well oil pipe under pressure treatment according to claim 4, characterized in that: In step S4, loosening the oil pipe (1) specifically refers to: loosening the oil pipe (1) by 0.5-1 turn using hydraulic pliers.

6. The construction method of a tool for sealing the failed internal part of a gas well oil pipe under pressure treatment according to claim 4 is characterized by: The step S4 of starting the undercut specifically includes: firstly lowering the pressure of the turntable (7), controlling the rotation speed of the turntable (7) to be no greater than 1 revolution per minute, slowly increasing the pressure of the turntable (7) until the oil pipe (1) starts to rotate, first loosening it by 3 turns when undercutting, and continuing to rotate it for 5 to 7 turns after the pressure is balanced to complete the undercut.

7. The construction method of a tool for sealing the failed internal part of a gas well oil pipe under pressure treatment according to claim 4, characterized in that: The method for judging whether the inverted connection is successful in step S4 is as follows: the oil pipe (1) is lifted to verify the pressure relief. If the pressure can be instantly restored, it is basically judged that the oil pipe (1) is inverted. Then, a trial lifting is performed to verify the inverted connection. The trial lifting is 5-10 cm. If the hanging weight does not increase, it is judged that the inverted connection is successful.

8. The construction method of a tool for treating a failed internal plugging of a gas well oil pipe under pressure according to claim 3 or 6, characterized in that: The belt pressing buckle in step S5 specifically refers to: Connect a butt-jointed centralizer and a full-bore oil pipe cock to the butt-jointed oil pipe. After calculating the top force on the oil pipe (1), lower the butt-jointed oil pipe to above the full-sealed gate (13). Close the movable slip group (6) and the annular blowout preventer (9). After completing the pressure balance in the pressurized chamber, close the upper working gate (10), open the full-sealed gate (13), lower the butt-jointed oil pipe under pressure, make it contact with the oil pipe (1) opened on the slip blowout preventer (3) in the original well, install a safety slip, ensure that the safety slip is fixed reliably, and then start the butt-jointed under pressure. After the butt-jointed is completed, the chamber pressure is gradually released. After passing the test, the pressure in the pressurized chamber is balanced again. The oil pipe (1) is tried to be lifted until the butt-jointed is successful.

9. The construction method of a tool for sealing the failed internal part of a gas well oil pipe under pressure treatment according to claim 8, characterized in that: The step S5 of starting the belt pressure buckle specifically refers to: starting the turntable (7) to start the belt pressure buckle until the buckle torque reaches a preset value.

Images