Electric submersible pump shaft cable on-site pressure test type high-pressure sealing device and method
By designing a site pressure-testing high-voltage sealing device for electric submersible pump wellbore cables, the problem of inability to test pressure and difficult construction of the existing high-voltage sealing devices is solved, efficient sealing of cables and simplification of construction is achieved, maintenance costs are reduced, and maintenance costs are increased. The integrity and insulation resistance of the wellbore cable are obtained.
Patent Information
- Application Number
- CN202411438462.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-15
- Publication Date
- 2025-01-07
AI Technical Summary
In the lifting process of heavy oil mixed with dilute or water injection, the existing high-voltage sealing device cannot achieve on-site pressure testing, resulting in poor sealing effect, difficult construction, easy damage to the cable, and complex maintenance, which affects the operation life of the downhole motor.
Design a field pressure test type high-voltage sealing device for electric submersible pump wellbore cables, including fixing screws, sealing joints, connecting nuts, locking nuts, double-male short-connection, wire blocking, pressure test short-connection, fixing nuts, and inner sealing joints , fix the joints and flanges, inject pressure oil into the seal chamber through the pressure test pump to ensure that the cable is not cut, reduce the number of times it passes through the casing four-way and flange valves, and maintain cable integrity and insulation resistance.
Reduces the probability of cable damage, improves construction efficiency and sealing performance, reduces construction difficulty and maintenance costs, ensures the integrity and insulation resistance of the wellbore cable, realizes the reliability and voltage resistance of high-voltage sealing, and simplifies on-site repair process.
Smart Images
Figure CN119267307A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of well completion construction of an electric submersible pump lifting process for dilution or water injection in a heavy oil well, and in particular to an on-site pressure test type high-pressure sealing device and method for an electric submersible pump wellbore cable. Background Art
[0002] At present, after the electric submersible pump lifting process is used for heavy oil dilution or water injection to complete the well construction, the wellhead high-pressure sealing device used is installed, but it is impossible to realize the on-site pressure test function and ensure the sealing effect.
[0003] When completing the well construction by electric submersible pump lifting technology for heavy oil dilution or water injection, it is usually necessary to pass the wellbore cable through the casing four-way and flank valve on the ground and connect it with the high-pressure sealing core wire. The high-pressure core wire seal is designed to integrate the cable core wire and the seal through glue filling, and then pass through the high-pressure flange to connect and seal with the casing four-way flank valve flange, which is prone to seal failure. In case of leakage, maintenance requires the organization of an operation construction team, lifting an oil pipe, cutting the wellbore cable, and reconnecting the high-pressure seal. The operation steps are as follows: 1) According to the designed pump hanging depth, lower the electric pump unit to the predetermined position, connect one more oil pipe, reserve a certain length of cable, cut off the excess cable, lower the oil pipe and pass the wellbore cable through the wellhead casing four-way and the flank valve; 2) Lift and remove the extra oil pipe, use a double male short-circuit to connect the oil pipe hanger to the wellbore oil pipe and tighten it, lower the pipe string to seal the hanger in place, and then pass it through the cable of the casing four-way flank valve, and mark the flange end face of the flank valve; 3) Lift the oil pipe and mark the wellbore on the cable mark Cut the cable at a certain distance, peel off the protective armor, expose the cable core, install the flange sealing steel ring, connect the cable core and the high-pressure sealing core with a copper sleeve and wrap it to seal; 4) Pass the high-pressure sealing core into the inner hole of the high-pressure flange and out, and fix it with a fixing nut; 5) Slowly lower the tubing to prevent the inner wall edge of the casing four-way from scratching the cable until the tubing hanger is lowered into place, and at the same time, the high-pressure sealing flange and the casing four-way side valve flange are close, and the flange connection is fixed and pressed with bolts to ensure reliable sealing without leakage. At this point, the well repair construction is completed.
[0004] In this process, the cable passes through the casing four-way, which has sharp edges on the inside, which can easily scratch the cable. Therefore, the number of times the cable passes through the four-way should be minimized. With existing high-pressure seals, it is very important to cut the reserved length of the wellbore cable that passes through the casing four-way and the flank valve: 1) The length is short, and the copper sleeve connection between the wellbore cable and the high-pressure sealing core wire is in a stretched state, resulting in a small contact area, increased current, and easy burning of the connection. In severe cases, the cable is disconnected and the downhole motor cannot operate normally; 2) The length is too long, and the gap between the high-pressure flange and the flange surface of the casing four-way flank valve is too large, resulting in difficulty in flange connection sealing. The requirements for the construction personnel's operating ability and on-site experience are high, and the construction difficulty and risk are increased.
[0005] In addition, since the high-pressure seal and the wellbore cable are connected by a copper sleeve, the compression and fixing effect of the copper sleeve directly affects the insulation resistance of the wellbore cable and the motor life of the underground electric pump unit. Moreover, the connection time between the wellbore cable and the high-pressure seal is long, which requires high proficiency, construction experience and technical skills of the on-site construction personnel, and the construction is difficult and has a high failure rate. Summary of the invention
[0006] The purpose of the present invention is to provide an on-site pressure-testing high-pressure sealing device and method for the wellbore cable of an electric submersible pump in view of the above-mentioned defects in the prior art, so as to reduce the probability of damage to the wellbore cable when it passes through the casing four-way and the flank valve; reduce the construction difficulty and improve the completion speed; make the operation of high-pressure sealing connection construction more convenient; the sealing performance is more reliable and the pressure resistance level is higher; ensure that the wellbore cable connection is in a balanced state without being stretched or squeezed; the sealing effect of the high-pressure seal can be tested on-site; the wellbore cable does not need to be cut to ensure the integrity and insulation resistance of the wellbore cable; if the high-pressure seal leaks, there is no need to mobilize the construction team to go up the derrick, and the wellbore pressure can be relieved for repair, thereby reducing construction costs, reducing the non-production time of the oil well, and improving the production time rate and output of the oil well.
[0007] The present invention discloses an on-site pressure test type high-pressure sealing device for an electric submersible pump wellbore cable, and the technical scheme thereof is as follows: comprising a fixed solenoid (1), a sealing joint (2), a connecting nut (8), a locking nut (9), a double male short circuit (12), a thread plug (13), a pressure test short circuit (14), a fixing nut (17), an inner sealing joint (18), a fixing joint (19), and a flange (21); the flange (21) is movably connected to the outside of a casing flank valve (22); the middle of the flange (21) is connected to the male end of the fixing joint (19); the other end of the fixing joint (19) is connected to one end of the double male short circuit (12) via a fixing nut (17); the inner sealing joint (18) is installed in the inner cavity of the fixing joint (19); and the locking nut (18) is installed on the outside of the fixing nut (17). Nut (9); a sealing joint (2) and a connecting nut (8) are installed at the other end of the double male short circuit (12); the sealing joint (2) is installed and fixed by the connecting nut (8); and a locking nut (9) is installed on the outer side of the connecting nut (8) to form a pressure test sealing chamber; a pressure test short circuit (14) is installed in the middle of the double male short circuit (12), and a thread plug (13) is installed at the upper end of the pressure test short circuit (14); the cable core wire passes through the fixed joint (19), the inner sealing joint (18), the double male short circuit (12) and the sealing joint (2) in sequence along the inside of the casing side valve (22) to connect to the ground equipment; a pressure test pump is connected by opening the thread plug (13) on the pressure test short circuit (14), and pressure test oil is injected into the pressure test short circuit (14) to perform an on-site high-pressure seal pressure test.
[0008] Preferably, the inner cavity of the inner sealing joint (18) and the sealing joint (2) is provided with three groups of cable core wire through holes, and a cable core wire (25.1) passes through each group of cable core wire through holes.
[0009] Preferably, the fixed spiral tube (1) is connected to the sealing joint (2) by means of a threaded connection, and the three cable core wire through holes in the sealing joint (2) are respectively inserted into the long sealing tube (10), and one end of the long sealing tube (10) is sequentially sleeved with the long seal (6), the second sealing ring (5), the short seal (4) and the fixed spiral tube (1), and the other end is installed with the sealing sleeve (11).
[0010] Preferably, the cable core wire (25.1) is inserted into the cable core wire through-hole of the inner sealing joint (18) through a short sealing tube (15) and is pressed into the inner sealing joint (18), one or more first sealing rings (3), short seals (4) and a pressing screw (16) are installed on the inner side of the short sealing tube (15), and a sealing sleeve (11) is installed on the outer side of the short sealing tube (15).
[0011] Preferably, a third sealing ring (7) is installed between the outer wall of the sealing joint (2) and the inner wall of the end of the double male short circuit (12).
[0012] Preferably, a third sealing ring (7) is installed between the outer wall of the inner sealing joint (18) and the inner wall of the end of the double male short circuit (12), and a fourth sealing ring (20) is installed between the outer wall of the end of the inner sealing joint (18) and the inner wall of the end of the fixed joint (19).
[0013] The method for using the on-site pressure testing type high-pressure sealing device for the electric submersible pump wellbore cable mentioned in the present invention comprises the following steps:
[0014] 1) According to the designed pump hanging depth, the electric pump unit is lowered to the predetermined position, one more oil pipe (24) is connected, a certain length of the cable (25) is reserved, the excess cable (25) in the wellbore is cut off, the oil pipe is lowered, and the cable in the wellbore is passed through the wellhead casing spool (23) and the casing side valve (22); 2) Lift the tubing string, remove the extra tubing (24), connect the tubing hanger and the wellbore tubing with a double male short-circuit, and slowly lower the tubing hanger to seal it in place to prevent the sharp edges of the inner wall of the wellhead casing spool (23) from scratching the cable (25);
[0015] 3) Strip the protective armor of the cable (25) passing through the casing side valve (22) to the end face of the flange (21) to form three cable core wires (25.1); 4) Sleeve the fixing nut (17) onto the fixing joint (19), connect one end of the fixing joint (19) to the flange (21) by threaded connection and tighten, then pass the three cable core wires (25.1) through the inner cavity of the fixing joint (19), and then connect and fix the flange (21) to the flange of the casing side valve (22); 5) Move the fixing nut (17) back toward the flange (21), install the third sealing ring (7) and the fourth sealing ring (20) on the inner sealing joint (18), pass the three cable cores (25.1) through the holes of the inner sealing joint (18), and move the inner sealing joint (18) toward the fixing joint (19); 6) Pass the short sealing tube (15), the first sealing ring (3), the short sealing (4) and the clamping screw (16) onto the three cable cores (25.1) in sequence, and tighten them by means of the clamping screw (16), and then fit the inner sealing joint (18) and the fixed joint (19) together and tighten them; 7) Put one sealing sleeve (11) in each direction, and put the long sealing tube (10) on the three cable cores (25.1). Leave a certain length between the long sealing tube (10) and the short sealing tube (15). Put the sealing sleeve (11) close to the long sealing tube (10) and the short sealing tube (15) respectively, and wrap them with cable sealing material to seal. 8) Install the locking nuts (9) to both ends of the double male shorting link (12), connect the inner ends of the double male shorting link (12) with the fixing nuts (17), and fix the inner sealing joint (18) with the locking nuts (9); 9) Then, install the third sealing ring (7) on the sealing joint (2), and then align the three cable cores (25.1) and the long sealing tube (10) of the wellbore and pass them through the sealing joint (2). Install the sealing joint (2) into the outer end of the double male short circuit (12), tighten it with the connecting nut (8), and then lock it with the locking nut (9); 10) Install the second sealing ring (5) on the long sealing ring (6), and sequentially pass the long sealing ring (6) with the sealing ring installed, the first sealing ring (3), the short sealing ring (4), the first sealing ring (3), and the fixing screw tube (1) onto the three cable core wires (25.1), and push them into the cable core wire through hole of the sealing joint (2), align the cable core wire (25.1) and the long sealing tube (10) and pass them out, tighten the fixing screw tube (1), and test the insulation resistance of the wellbore cable; 11) Remove the screw plug (13) in the pressure test short circuit (14) installed in the middle of the double male short circuit (12), inject pressure test oil, install the pressure test joint, connect the pressure test pump, and perform a pressure test. After the pressure test is qualified, connect the ground cable.
[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1) The present invention reduces the number of scrapes on the cable in the wellbore after it passes through the wellhead casing four-way and the casing side valve, thereby reducing the probability of cable damage; 2) After the cable passes through the wellhead casing four-way and the side valve, the tubing hanger seat can be sealed in place, thereby improving the completion efficiency; 3) When installing the pressure-testing high-pressure sealing device, there is no need to cut the cable; 4) There is no copper sleeve connection on the inside of the high-pressure seal, which reduces the wellbore cable connection points and improves the completion rate; 5) The integrity of the original wellbore cable and the insulation resistance are better maintained and are normal and reliable; 6) It avoids the phenomenon that the existing high-pressure seal and the wellbore cable are connected by a copper sleeve, which may cause the failure of the connection under pull-out and the difficulty of flange connection sealing under pressure; 7) It is durable High pressure value and no leakage, reliable sealing; 8) Ensure that the wellbore cable is in a free state without stretching and compression; 9) After the on-site installation is completed, the on-site pressure test can be carried out to test its sealing performance and reduce the operation risk; 10) After the pressure test is completed, the pressure test oil is retained in the pressure test chamber to separate the high-pressure seal from the gas in the casing to ensure that the sealing performance is more reliable; 11) If a high-pressure seal leaks, there is no need to mobilize the construction team. As long as the wellbore pressure is relieved to zero, the on-site pressure test type high-pressure sealing device can be disassembled for maintenance, which greatly reduces maintenance costs; 12) Shorten the installation and maintenance time of high-pressure seals, extend the production time of oil wells, and increase oil well production. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is an enlarged schematic diagram of the fixed spiral tube and the long sealing tube; Figure 3 It is an enlarged schematic diagram of the compression spiral tube and the short sealing tube; Figure 4 It is a schematic diagram of the structure of the present invention during construction; Figure 5 It is a schematic diagram of the structure of the present invention during construction; Figure 6 It is a schematic diagram of the structure of the present invention during construction; Figure 7 It is a schematic diagram of the structure of the present invention during construction; Figure 8 It is a schematic diagram of the structure of the present invention during construction; Fig. 9 It is a structural schematic diagram of the wellhead device of the present invention; Fig.10 It is a partial structural schematic diagram of embodiment 2 of the present invention; In the above figure: fixed screw pipe 1, sealing joint 2, first sealing ring 3, short seal 4, second sealing ring 5, long seal 6, third sealing ring 7, connecting nut 8, locking nut 9, long sealing tube 10, sealing sleeve 11, double male short circuit 12, thread plug 13, pressure test short circuit 14, short sealing tube 15, compression screw pipe 16, fixing nut 17, inner sealing joint 18, fixed joint 19, fourth sealing ring 20, flange 21, casing flank valve 22, wellhead casing cross 23, oil pipe 24, cable 25, cable core wire 25.1, copper sleeve 26, pressure test joint 27, pressure test pump joint 28, protective pipe 29. DETAILED DESCRIPTION
[0018] 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.
[0019] Example 1, reference Figure 1-Figure 9 The present invention relates to an on-site pressure test type high-pressure sealing device for an electric submersible pump wellbore cable, comprising a fixed solenoid 1, a sealing joint 2, a connecting nut 8, a locking nut 9, a double male short circuit 12, a thread plug 13, a pressure test short circuit 14, a fixing nut 17, an inner sealing joint 18, a fixing joint 19, and a flange 21. The flange 21 is movably connected to the outer side of a casing flank valve 22, the middle part of the flange 21 is connected to the male buckle end of the fixing joint 19, the other end of the fixing joint 19 is connected to one end of the double male short circuit 12 through the fixing nut 17, the inner sealing joint 18 is installed in the inner cavity of the fixing joint 19, and the locking nut 9 is installed on the outer side of the fixing nut 17; A sealing joint 2 and a connecting nut 8 are installed at the other end of the double male short circuit 12, the sealing joint 2 is installed and fixed by the connecting nut 8, and a locking nut 9 is installed on the outer side of the connecting nut 8 to form a pressure test sealing chamber; a pressure test short circuit 14 is installed in the middle of the double male short circuit 12, and a thread plug 13 is installed on the upper end of the pressure test short circuit 14; the cable core wire passes through the fixed joint 19, the internal sealing joint 18, the double male short circuit 12 and the sealing joint 2 in sequence along the inside of the casing flank valve 22 to be connected to the ground equipment; the pressure test pump is connected by opening the thread plug 13 on the pressure test short circuit 14, and the pressure test oil is injected into the pressure test short circuit 14 to perform an on-site high-pressure sealing pressure test.
[0020] The inner sealing joint 18 and the inner cavity of the sealing joint 2 are provided with three groups of cable core wire through holes, and a cable core wire 25.1 passes through each group of cable core wire through holes.
[0021] The above-mentioned fixed spiral tube 1 is connected to the sealing joint 2 by means of a threaded connection. The three cable core wire through holes in the sealing joint 2 are respectively inserted into the long sealing tube 10. One end of the long sealing tube 10 is sequentially covered with the long seal 6, the second sealing ring 5, the short seal 4 and the fixed spiral tube 1, and the other end is installed with a sealing sleeve 11.
[0022] The cable core wire 25.1 is inserted into the cable core wire through-hole of the above-mentioned inner sealing joint 18 through the short sealing tube 15 and pressed into the inner sealing joint 18, one or more first sealing rings 3, short seals 4 and pressing screws 16 are installed on the inner side of the short sealing tube 15, and a sealing sleeve 11 is installed on the outer side of the short sealing tube 15.
[0023] A third sealing ring 7 is installed between the outer wall of the sealing joint 2 and the inner wall of the end of the double male short circuit 12 .
[0024] A third sealing ring 7 is installed between the outer wall of the inner sealing joint 18 and the inner wall of the end of the double male short circuit 12 , and a fourth sealing ring 20 is installed between the outer wall of the end of the inner sealing joint 18 and the inner wall of the end of the fixed joint 19 .
[0025] Reference Figure 4-Figure 8 The method for using the electric submersible pump wellbore cable field pressure test type high-pressure sealing device mentioned in the present invention comprises the following steps:
[0026] 1) According to the designed pump hanging depth, lower the electric pump unit to the predetermined position, connect one more oil pipe 24, reserve a certain length of cable 25, cut off the excess cable 25 in the wellbore, lower the oil pipe and pass the cable in the wellbore through the wellhead casing spool 23 and the casing side valve 22; 2) Lift the tubing string, remove the extra tubing 24, connect the tubing hanger and the wellbore tubing with a double male short-circuit, and slowly lower the tubing hanger to set it in place to prevent the sharp edges of the inner wall of the wellhead casing spool 23 from scratching the cable 25;
[0027] 3) The protective armor of the cable 25 passing through the casing side valve 22 is stripped to the end face of the flange 21 to form three cable core wires 25.1; 4) Sleeve the fixing nut 17 on the fixing joint 19, connect one end of the fixing joint 19 with the flange 21 by threaded connection and tighten, then pass the three cable core wires 25.1 through the inner cavity of the fixing joint 19, and then connect and fix the flange 21 with the flange of the casing side valve 22; 5) Move the fixing nut 17 back to the flange 21, install the third sealing ring 7 and the fourth sealing ring 20 on the inner sealing joint 18, pass the three cable cores 25.1 through the hole of the inner sealing joint 18, and move the inner sealing joint 18 toward the fixing joint 19; 6) Pass the short sealing tube 15, the first sealing ring 3, the short seal 4 and the clamping screw 16 onto the three cable cores 25.1 in sequence, and press them together with the clamping screw 16, and then fit and press the inner sealing joint 18 and the fixed joint 19 together; 7) Put one sealing sleeve 11 in each direction, and put the long sealing tube 10 on the three cable cores 25.1. Leave a certain length between the long sealing tube 10 and the short sealing tube 15. The sealing sleeve 11 is tightly attached to the long sealing tube 10 and the short sealing tube 15 respectively, and is sealed with cable sealing material; 8) Install the locking nuts 9 to both ends of the double male shorting link 12, connect the inner ends of the double male shorting link 12 with the fixing nuts 17, and fix the inner sealing joint 18 at the same time, and lock and fix it with the locking nuts 9; 9) Then, install the third sealing ring 7 on the sealing joint 2, and then align the three cable cores 25.1 of the wellbore and the long sealing tube 10 and pass them through the sealing joint 2, install the sealing joint 2 into the outer end of the double male short circuit 12, tighten it with the connecting nut 8, and then lock it with the locking nut 9; 10) Install the second sealing ring 5 on the long sealing ring 6, and sequentially pass the long sealing ring 6, the first sealing ring 3, the short sealing ring 4, the first sealing ring 3, and the fixed screw 1 onto the three cable cores 25.1, and push them into the cable core through-hole of the sealing joint 2, and pass the cable core 25.1 and the long sealing tube 10 through the center, tighten the fixed screw 1, and test the insulation resistance of the wellbore cable; 11) Remove the thread plug 13 in the pressure test short circuit 14 installed in the middle of the double male short circuit 12, fill it with pressure test oil, install the pressure test joint 27, connect the pressure test pump through the pressure test pump joint 28 and the pipeline, and conduct a pressure test. After the pressure test is qualified, connect the ground cable. After the pressure test is completed, the pressure test oil is retained in the pressure test chamber to separate the high-pressure seal from the gas in the casing to ensure that the sealing performance is more reliable; if the high-pressure seal leaks during the pressure test, there is no need to mobilize the construction team. As long as the wellbore pressure is relieved to zero, the on-site pressure test high-pressure sealing device can be disassembled for maintenance, which greatly reduces the maintenance cost; reduces the number of scratches on the wellbore cable after passing through the wellhead casing four-way and the casing side valve, and reduces the chance of cable damage.
[0028] Embodiment 2, the present invention mentions a submersible pump wellbore cable on-site pressure test type high-pressure sealing device, comprising a fixed spiral tube 1, a sealing joint 2, a connecting nut 8, a locking nut 9, a double male short circuit 12, a thread plug 13, a pressure test short circuit 14, a fixing nut 17, an inner sealing joint 18, a fixing joint 19, and a flange 21. The flange 21 is movably connected to the outer side of the casing flank valve 22, the middle part of the flange 21 is connected to the male buckle end of the fixing joint 19, the other end of the fixing joint 19 is connected to one end of the double male short circuit 12 through the fixing nut 17, the inner sealing joint 18 is installed in the inner cavity of the fixing joint 19, and the locking nut is installed on the outer side of the fixing nut 17. 9; Install a sealing joint 2 and a connecting nut 8 at the other end of the double male short circuit 12, install and fix the sealing joint 2 through the connecting nut 8, and install a locking nut 9 on the outside of the connecting nut 8 to form a pressure test sealing chamber; install a pressure test short circuit 14 in the middle of the double male short circuit 12, and install a wire plug 13 on the upper end of the pressure test short circuit 14; the cable core wire passes through the fixed joint 19, the internal sealing joint 18, the double male short circuit 12 and the sealing joint 2 in sequence along the inside of the casing flank valve 22 to connect to the ground equipment; connect the pressure test pump by opening the wire plug 13 on the pressure test short circuit 14, inject pressure test oil into the pressure test short circuit 14, and perform a pressure test of the high-pressure seal on site.
[0029] The difference from Example 1 is: Reference Fig.10 The outer ends of the three cable cores 25.1 mentioned in this embodiment are connected to the electric control cabinet through the copper sleeve 26 and the ground cable, and the outer end of the sealing joint 2 is sleeved with a protective tube 29, thereby protecting the cable cores outside the device of the present invention.
[0030] 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 high-pressure sealing device for an electric submersible pump wellbore cable on-site pressure testing, characterized by: The invention comprises a fixed spiral tube (1), a sealing joint (2), a connecting nut (8), a locking nut (9), a double male short circuit (12), a thread plug (13), a pressure test short circuit (14), a fixing nut (17), an inner sealing joint (18), a fixing joint (19), and a flange (21). The flange (21) is movably connected to the outer side of the casing flank valve (22). The middle part of the flange (21) is connected to the male buckle end of the fixing joint (19). The other end of the fixing joint (19) is connected to one end of the double male short circuit (12) through the fixing nut (17). The inner sealing joint (18) is installed in the inner cavity of the fixing joint (19). The locking nut (9) is installed on the outer side of the fixing nut (17). ) is installed at the other end of the casing flank valve (22) through the fixed joint (19), the inner sealing joint (18), the double male short-circuit (12) and the sealing joint (2) are connected to the ground equipment; the sealing joint (2) is fixed by the connecting nut (8), and a locking nut (9) is installed on the outer side of the connecting nut (8) to form a pressure test sealing chamber; a pressure test short-circuit (14) is installed in the middle of the double male short-circuit (12), and a thread plug (13) is installed on the upper end of the pressure test short-circuit (14); the cable core wire passes through the fixed joint (19), the inner sealing joint (18), the double male short-circuit (12) and the sealing joint (2) in sequence along the inside of the casing flank valve (22) to connect to the ground equipment; the thread plug (13) on the pressure test short-circuit (14) is opened to connect the pressure test pump, and the pressure test oil is injected into the pressure test short-circuit (14) to perform an on-site high-pressure seal pressure test.
2. The on-site pressure-testing high-pressure sealing device for electric submersible pump wellbore cable according to claim 1 is characterized by: The inner sealing joint (18) and the inner cavity of the sealing joint (2) are provided with three groups of cable core wire through holes, and a cable core wire (25.1) passes through each group of cable core wire through holes.
3. The field pressure test type high pressure sealing device for electric submersible pump surface cable according to claim 2 is characterized by: The fixed spiral tube (1) is connected to the sealing joint (2) by means of a threaded connection. The three cable core wire through holes in the sealing joint (2) are respectively inserted into long sealing tubes (10). One end of the long sealing tube (10) is sequentially sleeved with a long seal (6), a second sealing ring (5), a short seal (4) and the fixed spiral tube (1), and the other end is installed with a sealing sleeve (11).
4. The on-site pressure-testing high-pressure sealing device for electric submersible pump wellbore cable according to claim 3 is characterized by: The cable core wire (25.1) is inserted into the cable core wire through-hole of the inner sealing joint (18) through a short sealing tube (15) and is pressed into the inner sealing joint (18). One or more first sealing rings (3), short seals (4) and a pressing screw (16) are installed on the inner side of the short sealing tube (15), and a sealing sleeve (11) is installed on the outer side of the short sealing tube (15).
5. The on-site pressure-testing high-pressure sealing device for electric submersible pump wellbore cable according to claim 4 is characterized by: A third sealing ring (7) is installed between the outer wall of the sealing joint (2) and the inner wall of the end of the double male short circuit (12).
6. The on-site pressure-testing high-pressure sealing device for electric submersible pump wellbore cable according to claim 5 is characterized by: A third sealing ring (7) is installed between the outer wall of the inner sealing joint (18) and the inner wall of the end of the double male short circuit (12), and a fourth sealing ring (20) is installed between the outer wall of the end of the inner sealing joint (18) and the inner wall of the end of the fixed joint (19).
7. The method for using the on-site pressure testing type high-pressure sealing device for electric submersible pump wellbore cable according to claim 6 is characterized by: The following steps are involved:
1. Well repair construction 1) According to the designed pump hanging depth, the electric pump unit is lowered to the predetermined position, one more oil pipe (24) is connected, a certain length of the cable (25) is reserved, the excess cable (25) in the wellbore is cut off, the oil pipe is lowered, and the cable in the wellbore is passed through the wellhead casing spool (23) and the casing side valve (22); 2) Lift the tubing string, remove the extra tubing (24), connect the tubing lowered into the wellbore to the tubing hanger with a tubing double male short-circuit, and slowly lower the tubing hanger to seal it in place to prevent the sharp edges of the inner wall of the wellhead casing spool (23) from scratching the cable (25); 2. On-site pressure test high pressure seal installation: 3) Strip the protective armor of the cable (25) passing through the casing side valve (22) to the end face of the flange (21) to form three cable core wires (25.1); 4) Sleeve the fixing nut (17) onto the fixing joint (19), connect one end of the fixing joint (19) to the flange (21) by threaded connection and tighten, then pass the three cable core wires (25.1) through the inner cavity of the fixing joint (19), and then connect and fix the flange (21) to the flange of the casing side valve (22); 5) Move the fixing nut (17) back toward the flange (21), install the third sealing ring (7) and the fourth sealing ring (20) on the inner sealing joint (18), pass the three cable cores (25.1) through the holes of the inner sealing joint (18), and move the inner sealing joint (18) toward the fixing joint (19); 6) Pass the short sealing tube (15), the first sealing ring (3), the short sealing (4) and the clamping screw (16) onto the three cable cores (25.1) in sequence, and tighten them by means of the clamping screw (16), and then fit the inner sealing joint (18) and the fixed joint (19) together and tighten them; 7) Put one sealing sleeve (11) in each direction, and put the long sealing tube (10) on the three cable cores (25.1). Leave a certain length between the long sealing tube (10) and the short sealing tube (15). Put the sealing sleeve (11) close to the long sealing tube (10) and the short sealing tube (15) respectively, and wrap them with cable sealing material to seal. 8) Install the locking nuts (9) to both ends of the double male shorting link (12), connect the inner ends of the double male shorting link (12) with the fixing nuts (17), and fix the inner sealing joint (18) with the locking nuts (9); 9) Then, install the third sealing ring (7) on the sealing joint (2), and then align the three cable cores (25.1) and the long sealing tube (10) of the wellbore and pass them through the sealing joint (2). Install the sealing joint (2) into the outer end of the double male short circuit (12), tighten it with the connecting nut (8), and then lock it with the locking nut (9); 10) Install the second sealing ring (5) on the long sealing ring (6), and sequentially pass the long sealing ring (6) with the sealing ring installed, the first sealing ring (3), the short sealing ring (4), the first sealing ring (3), and the fixing screw tube (1) onto the three cable core wires (25.1), and push them into the cable core wire through hole of the sealing joint (2), align the cable core wire (25.1) and the long sealing tube (10) and pass them out, tighten the fixing screw tube (1), and test the insulation resistance of the wellbore cable; 11) Remove the screw plug (13) in the pressure test short circuit (14) installed in the middle of the double male short circuit (12), inject pressure test oil, install the pressure test joint, connect the pressure test pump, and perform a pressure test. After the pressure test is qualified, connect the ground cable.