Automatic grease injection sealing steel cable and blowout preventer for gas well swabbing operation

Abstract

The application discloses a gas well swabbing operation automatic grease injection sealing steel cable and blowout preventer, which comprises sequentially connected blowout sealing devices, double grease scraping devices, grease injection sealing steel cable devices, impact prevention devices, swabbing tool string containing tubes, hydraulic eccentric fish falling prevention devices, hydraulic control double-acting blowout preventers and intelligent wellhead devices; the blowout sealing devices, the double grease scraping devices, the hydraulic eccentric fish falling prevention devices and the hydraulic control double-acting blowout preventers are connected with an electromagnetic valve group device through hydraulic pipelines; the electromagnetic valve group device is connected with a hydraulic station through a hydraulic pipeline; the grease injection sealing steel cable devices are connected with sealing grease injection devices; the hydraulic eccentric fish falling prevention devices, the intelligent wellhead devices, the electromagnetic valve group device, the hydraulic station and the sealing grease injection devices are connected with an intelligent control system through signal lines. The device can realize automatic grease injection sealing of the steel cable, and can automatically close the blowout preventer and the oil and gas external transmission pipeline according to the pressure condition in the wellbore.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of oil and gas field development and production devices, and relates to an automatic grease injection sealing steel cable and blowout preventer for gas well swabbing operation. BACKGROUND

[0002] In the process of gas production in an oil and gas well, water is discharged from the downhole formation, and when the liquid accumulation at the bottom of the well is serious, the wellbore will be flooded, gas production will be difficult, and even production will be stopped. In view of the downhole liquid accumulation problem, a steel cable swabbing operation device is usually used for swabbing and drainage gas production in the production site, but the swabbing operation device lacks a steel cable sealing device or the sealing performance of the steel cable sealing device is poor, which often leads to natural gas leakage during the swabbing operation process, and accidents such as deflagration are prone to occur. At the same time, such a swabbing operation device also has the problem that the swabbing operation tool connected thereto will fall into the wellbore due to the jumping and breaking of the steel cable, and the fishing cost is extremely high. In addition, although a steel cable grease injection sealing device is also matched during the swabbing operation, the grease injection sealing device of this type has the following problems: (1) manual operation is required to realize the opening and stopping of the grease injection sealing steel cable and the fish falling prevention device in the operation site, and the operation intensity is large; (2) the steel cable is not sealed tightly and firmly, and natural gas leakage often occurs between the steel cable and the annular space of the operation device during the operation, and deflagration accidents are prone to occur; (3) the existing grease injection sealing device does not integrate a steel cable lowering and lifting depth detection device, and there is a cumulative error problem of the steel cable lowering and lifting depth, which affects the efficiency of the swabbing operation; (4) the grease injection sealing device of this type cannot realize automatic grease injection sealing operation without manual operation. In addition, the existing swabbing operation process cannot realize the function of automatically closing the blowout preventer and the oil and gas export pipeline according to the pressure condition in the wellbore, the oil grease adhering to the steel cable cannot be scraped off completely, and the oil grease cannot be recycled, which leads to the safety risk of the existing swabbing operation, the high operation cost, and the failure to meet the actual needs of building a smart oil and gas field and reducing costs and increasing efficiency at the present stage. SUMMARY

[0003] The purpose of the present application is to provide an automatic grease injection sealing steel cable and blowout preventer for gas well swabbing operation, which can realize automatic grease injection sealing of the steel cable and can automatically close the blowout preventer and the oil and gas export pipeline according to the pressure condition in the wellbore.

[0004] The technical scheme adopted by the present application is that the automatic grease injection sealing steel cable and blowout preventer device for gas well swabbing operation comprises, in sequence, a blowout sealing device, a double grease scraping device, a grease injection sealing steel cable device, an impact protection device, a swabbing tool string containing pipe, a hydraulic eccentric fish falling prevention device, a hydraulic double-acting blowout preventer device and an intelligent wellhead device; the blowout sealing device, the double grease scraping device, the hydraulic eccentric fish falling prevention device and the hydraulic double-acting blowout preventer device are connected with an electromagnetic valve group device through hydraulic pipelines; the electromagnetic valve group device is connected with a hydraulic station through a hydraulic pipeline; the grease injection sealing steel cable device is connected with a sealing grease injection device; the hydraulic eccentric fish falling prevention device, the intelligent wellhead device, the hydraulic station and the sealing grease injection device are connected with an intelligent control system through signal lines; a plurality of electromagnetic valves are arranged in the electromagnetic valve group device, and the electromagnetic valves are connected with the intelligent control system.

[0005] The present application has the following characteristics:

[0006] The blowout sealing device is provided with a mounting seat, an alarm lamp and a gas detector are arranged on the mounting seat, the alarm lamp is connected with the intelligent control system through an alarm data signal line, and the gas detector is connected with the intelligent control system through a gas detection signal data line.

[0007] The double grease scraping device is connected with a waste grease liquid recovery station, and the grease injection sealing steel cable device is connected with a reusable grease recovery station.

[0008] The swabbing tool string containing pipe is placed with a swabbing tool string, and the steel cable passes through the inner hole of the blowout sealing device, the double grease scraping device, the grease injection sealing steel cable device, the impact protection device and the swabbing tool string containing pipe in sequence and contacts the swabbing tool string.

[0009] The blowout sealing device comprises a body, a lower sealing block is arranged in the inner hole of the body, one side of the lower sealing block contacts the body, the other side of the lower sealing block is sequentially provided with a composite seal, an upper sealing block and a sealing seat, a sealing ring is arranged in the inner hole of the sealing seat, the other side of the sealing seat is provided with a pressing block, the other side of the pressing block is an end cover, and the end cover is sleeved with one end of the body through an internal thread; a blowout sealing hydraulic valve is connected with the outer sidewall of the body, the blowout sealing hydraulic valve is threadedly connected with one end of the hydraulic pipeline, the other end of the hydraulic pipeline is connected with a No. electromagnetic valve, and the No. electromagnetic valve is installed on the electromagnetic valve group device.

[0010] The double scraping device comprises an outer cylinder, a sealing joint and a brush-type grease scraper which are threadedly connected in the inner hole of the outer cylinder, the brush-type grease scraper is connected with a sealing pad, the other side of the sealing pad is sequentially provided with a spiral-type grease scraper and a top sealing head, the inner hole of the spiral-type grease scraper adopts a spiral structure, a grease scraper hydraulic valve and a waste grease liquid recovery valve are threadedly connected on the outer side wall of the outer cylinder, the grease scraper hydraulic valve is threadedly connected with one end of a grease scraper hydraulic pipeline, the other end of the grease scraper hydraulic pipeline is connected with a solenoid valve, the solenoid valve is installed on an electromagnetic valve group device, the waste grease liquid recovery valve is threadedly connected with one end of a waste grease liquid recovery pipeline, the other end of the waste grease liquid recovery pipeline is connected with a waste grease liquid recovery station.

[0011] The grease injection sealing cable device comprises a grease injection shell, a sealing pipe arranged in the inner hole of the grease injection shell, a ring groove type grease injection shaft threadedly connected with the sealing pipe, a tapered grease containing cover arranged in the hole cavity formed by the sealing pipe and the ring groove type grease injection shaft, wherein the sealing pipe and the tapered grease containing cover are a multi-stage connection structure, a plug, a grease outlet valve, a grease injection sealing valve and a one-way hydraulic valve are threadedly connected on the outer side wall of the grease injection shell, the grease outlet valve is threadedly connected with one end of a grease outlet recovery pipeline, the other end of the grease outlet recovery pipeline is connected with a reusable grease recovery station, the one-way hydraulic valve is in contact with the grease injection sealing valve, the grease injection sealing valve is threadedly connected with one end of a grease injection sealing hydraulic pipeline, the other end of the grease injection sealing hydraulic pipeline is connected with a sealing grease injection device, and the sealing grease injection device is connected with an intelligent control system through a grease injection instruction data line.

[0012] The anti-impact device comprises an upper joint, a lower joint threadedly connected with the upper joint through an outer thread, an anti-impact core shaft arranged in the inner hole of the lower joint, an anti-impact spring and a spring seat sequentially arranged on one side of the anti-impact core shaft, and the spring seat arranged in the inner hole of the upper joint and threadedly connected with the upper joint.

[0013] The hydraulic eccentric fish falling prevention device comprises an upper eccentric joint, an eccentric fish falling prevention shaft, a lower eccentric joint, an intermediate joint and a hammer type fish falling prevention joint which are sequentially threadedly connected, a sealing plug threadedly connected in the eccentric hole of the eccentric fish falling prevention shaft, a ball head piston installed in one end of the eccentric hole of the sealing plug, a reset spring sleeved on the small diameter rod of the ball head piston and in contact with the eccentric fish falling prevention shaft, a fixed seat fixed in the square hole of the eccentric fish falling prevention shaft, and a rotating shaft fixed on the fixed seat, a flap and a torsion spring sleeved on the rotating shaft, the flap pressed by one end of the torsion spring and the other end of the torsion spring fixed in the body groove of the eccentric fish falling prevention shaft, a fish falling prevention hydraulic valve threadedly connected on the outer side wall of the eccentric fish falling prevention shaft, the fish falling prevention hydraulic valve connected with one end of a fish falling prevention hydraulic pipeline, the other end of the fish falling prevention hydraulic pipeline connected with a solenoid valve, the solenoid valve installed on an electromagnetic valve group device, an anti-explosion proximity sensor threadedly connected on the outer side wall of the lower eccentric joint, the anti-explosion proximity sensor connected with one end of an anti-explosion proximity sensor signal line, and the other end of the anti-explosion proximity sensor signal line connected with an intelligent control system.

[0014] The hydraulic valves on the hydraulic control double-acting blowout preventer are connected with the electromagnetic valves arranged on the electromagnetic valve group device through hydraulic pipelines;

[0015] The intelligent wellhead device comprises a casing pressure sensor, an oil pressure sensor and an electric plug valve, wherein the casing pressure sensor is installed on a casing pressure gauge flange of the intelligent wellhead device, the casing pressure sensor is connected with one end of a casing pressure sensing signal data line, and the other end of the casing pressure sensing signal data line is connected with an intelligent control system; the oil pressure sensor is installed on an oil pressure gauge flange of the intelligent wellhead device, the oil pressure sensor is connected with one end of an oil pressure sensing signal data line, and the other end of the oil pressure sensing signal data line is connected with the intelligent control system; the electric plug valve is threadedly connected on an external pipeline of the intelligent wellhead device, the electric plug valve is connected with one end of an electric plug valve control data line, and the other end of the electric plug valve control data line is connected with the intelligent control system.

[0016] The present application has the following advantages:

[0017] The automatic grease injection sealing steel cable and blowout preventer device of the present application is used in the process of pumping and drainage water production in oil and gas fields, and the intelligent control system of the device can realize unmanned automatic grease injection sealing of the steel cable according to the signals fed back by the gas detector, the explosion-proof proximity sensor, the casing pressure sensor and the oil pressure sensor; the length of the steel cable lowered and the length of the steel cable lifted are tested and compared to improve the measurement accuracy of the pumping depth, and then the operation efficiency is improved; the blowout preventer and the oil and gas external pipeline are automatically closed according to the pressure condition in the wellbore to ensure the safety of the operation. In addition, the device also has the function of double grease scraping, which can scrape off the grease adhered to the steel cable cleanly to prevent natural gas leakage; the device also has the functions of buffering the upward impact force of the tool string, preventing fish falling, providing hydraulic pressure for each part of the device by the intelligent control electromagnetic valve, automatically recycling waste grease, recycling clean grease, etc., realizing intelligent and unmanned automatic grease injection, opening and closing the wellhead and the external pipeline, etc., improving the operation safety and efficiency, reducing the operation intensity and cost, and meeting the actual needs of building intelligent oil and gas fields and reducing cost and increasing efficiency at the present stage. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic diagram of the automatic grease injection sealing steel cable and blowout preventer device of the present application;

[0019] Figure 2 is a structural schematic diagram of the blowout preventer sealing device in the device of the present application;

[0020] Figure 3 is a structural schematic diagram of the double grease scraping device in the device of the present application;

[0021] Figure 4 is a structural schematic diagram of the grease injection sealing steel cable device in the device of the present application;

[0022] Figure 5is the structure diagram of the anti-impact device in the device of the present application;

[0023] Figure 6 is the structure diagram of the liquid-driven eccentric fish falling prevention device in the closed state in the device of the present application;

[0024] Figure 7 is the structure diagram of the liquid-driven eccentric fish falling prevention device in the open state in the device of the present application;

[0025] Figure 8 is Figure 6 is the structure diagram of the partial enlargement of A in the device of the present application;

[0026] Figure 9 is Figure 6 is the structure diagram of B in the device of the present application;

[0027] Figure 10 is the structure diagram of the liquid-controlled double-acting blowout prevention device in the device of the present application;

[0028] Figure 11 is the structure diagram of the intelligent wellhead device in the device of the present application;

[0029] Figure 12 is the structure diagram of the electromagnetic valve group device in the device of the present application;

[0030] Figure 13 is the structure diagram of the intelligent control system in the device of the present application;

[0031] Figure 14 is the structure diagram of the sealing grease injection device in the device of the present application.

[0032] In the figure, 1. blowout sealing device, 101. body, 102. lower sealing block, 103. composite seal, 104. blowout sealing hydraulic valve, 105. upper sealing block, 106. sealing seat, 107. sealing ring, 108. pressing block, 109. end cover, 110. hydraulic pipeline;

[0033] 2. double grease scraping device, 201. outer cylinder, 202. sealing joint, 203. brush type grease scraper, 204. sealing gasket, 205. spiral type grease scraper, 206. top sealing head, 207. grease scraper hydraulic valve, 208. grease scraper hydraulic pipeline, 209. waste grease recovery valve, 210. waste grease recovery pipeline;

[0034] 3. grease injection sealing steel cable device, 301. grease injection shell, 302. sealing pipe, 303. conical grease containing cover, 304. plug, 305. ring groove type grease injection shaft, 306. grease outlet valve, 307. grease outlet recovery pipeline, 308. grease injection sealing valve, 309. one-way hydraulic valve, 310. grease injection sealing hydraulic pipeline;

[0035] 4. Anti-impact device, 401. upper joint, 402. lower joint, 403. spring seat, 404. anti-impact spring, 405. anti-impact mandrel;

[0036] 5. Pipe for containing the string of pumping tools;

[0037] 6. Hydraulic eccentric fish preventing device, 601. upper eccentric joint, 602. eccentric fish preventing mandrel, 603. lower eccentric joint, 604. intermediate joint, 605. hammering type joint, 606. explosion-proof proximity sensor, 607. explosion-proof proximity sensor signal line, 608. sealing plug, 609. fish preventing hydraulic valve, 610. fish preventing hydraulic line, 611. ball head piston, 612. return spring, 613. flap, 614. fixed seat, 615. rotating shaft, 616. torsion spring, 617. fixing screw;

[0038] 7. Hydraulic double-acting blowout preventer, 701. body of blowout preventer, 702. full seal piston, 703. full seal plate of string of tools, 704. half seal piston, 705. half seal plate of wireline, 706. full seal plate closing hydraulic valve, 707. full seal plate closing hydraulic line, 708. full seal plate opening hydraulic valve, 709. full seal plate opening hydraulic line, 710. half seal plate closing hydraulic valve, 711. half seal plate closing hydraulic line, 712. half seal plate opening hydraulic valve, 713. half seal plate opening hydraulic line, 714. connecting bolt;

[0039] 8. Intelligent wellhead device, 801. casing pressure sensor, 802. casing pressure sensing signal data line, 803. oil pressure sensor, 804. oil pressure sensing signal data line, 805. electric plug valve, 806. electric plug valve control data line;

[0040] 9. Electromagnetic valve group device, 901. No. 1 electromagnetic valve, 902. No. 2 electromagnetic valve, 903. No. 3 electromagnetic valve, 904. No. 4 electromagnetic valve, 905. No. 5 electromagnetic valve, 906. No. 6 electromagnetic valve, 907. No. 7 electromagnetic valve, 908. electromagnetic valve control data line;

[0041] 10. Hydraulic station;

[0042] 11. Intelligent control system, 1101. hydraulic station instruction data line, 1102. grease injection instruction data line, 1103. gas detection signal data line, 1104. alarm data signal line;

[0043] 12. Grease injection device, 13. mounting seat, 14. alarm lamp, 15. gas detector, 16. wireline, 17. waste grease recovery station, 18. reusable grease recovery station, 19. string of pumping tools. DETAILED DESCRIPTION

[0044] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0045] Example 1

[0046] This invention relates to an automatic grease-sealing steel cable and blowout preventer for gas well pumping operations, the structure of which is as follows: Figure 1 As shown, the system includes a blowout preventer sealing device 1, a double grease scraping device 2, a grease injection sealing cable device 3, an impact protection device 4, a pumping tool string receiving tube 5, a hydraulically driven eccentric anti-fishing device 6, and a hydraulically controlled double-acting blowout preventer 7, all connected in sequence by threads. The hydraulically controlled double-acting blowout preventer 7 is fixedly connected to an intelligent wellhead device 8 via connecting bolts 714. The blowout preventer sealing device 1, the double grease scraping device 2, the hydraulically driven eccentric anti-fishing device 6, and the hydraulically controlled double-acting blowout preventer 7 are all connected to a solenoid valve assembly 9 via hydraulic lines. The solenoid valve assembly 9 is connected to a hydraulic station 10 via hydraulic lines. The grease injection sealing cable device 3 is connected to a grease injection device 12. The hydraulically driven eccentric anti-fishing device 6, the intelligent wellhead device 8, the hydraulic station 10, and the grease injection device 12 are all connected to an intelligent control system 11 via signal lines. The solenoid valve assembly 9 contains several solenoid valves, all of which are connected to the intelligent control system 11.

[0047] Example 2

[0048] Based on Example 1, a mounting base 13 is provided at the anti-spray sealing device 1. An alarm light 14 and a gas detector 15 are mounted on the mounting base 13. The alarm light 14 is connected to the intelligent control system 11 via an alarm data signal line 1104, and the gas detector 15 is connected to the intelligent control system 11 via a gas detection signal data line 1103. A dual grease scraping device 2 is connected to a waste grease recovery station 17, and a grease injection sealing cable device 3 is connected to a reusable grease recovery station 18.

[0049] Example 3

[0050] This invention relates to an automatic grease-sealing steel cable and blowout preventer for gas well pumping operations, the structure of which is as follows: Figure 1 As shown, the device includes a blowout preventer sealing device 1, a double grease scraping device 2, a grease injection sealing cable device 3, an impact protection device 4, a pumping tool string receiving tube 5, a hydraulically driven eccentric anti-fishing device 6, and a hydraulically controlled double-acting blowout preventer 7, which are connected in sequence by threaded connections. The hydraulically controlled double-acting blowout preventer 7 is fixedly connected to an intelligent wellhead device 8 by connecting bolts 714.

[0051] The blowout sealing device 1 is in contact with the mounting seat 13, the mounting seat 13 is provided with an alarm lamp 14 and a gas detector 15, and the alarm lamp 14 and the gas detector 15 are connected with the intelligent control system 11 through an alarm data signal line 1104 and a gas detection signal data line 1103 respectively. The basic function of this part is that when the gas detector 15 detects that the natural gas at the top of the blowout sealing device 1 leaks, the signal is transmitted to the intelligent control system 11, the intelligent control system 11 controls the alarm lamp 14 to flash, and plays a warning and reminding role, and the intelligent control system 11 intelligently controls the sealing grease injection device 12 to automatically inject grease to seal the steel cable, so as to ensure that the natural gas no longer leaks.

[0052] The steel cable 16 passes through the inner holes of the blowout sealing device 1, the double grease scraping device 2, the grease injection sealing steel cable device 3, the impact protection device 4 and the string containing pipe 5 of the swabbing tool in sequence, and is in contact with the swabbing tool string 19, and the swabbing tool string 19 stays in the string containing pipe 5. The basic function of this part is that the steel cable 16 is in contact with the swabbing tool string 19, and the swabbing tool string 19 stays in the string containing pipe 5 when it is lifted during operation.

[0053] As shown in Figure 2 , Figure 12 , the blowout sealing device 1 comprises a body 101, a lower sealing block 102 is arranged in the inner hole of the body 101, one side of the lower sealing block 102 is in contact with the body 101, and the other side is sequentially provided with a composite seal 103, an upper sealing block 105 and a sealing seat 106. The composite seal 103 is made of metal and rubber vulcanization, has the characteristics of wear resistance, grease resistance and high elasticity. The sealing seat 106 is provided with a sealing ring 107 in the inner hole, and the other side of the sealing seat 106 is provided with a pressing block 108, and the other side of the pressing block 108 is an end cover 109. The end cover 109 is sleeved with one end of the body 101 through internal threads. The blowout sealing hydraulic valve 104 is threadedly connected to the outer side wall of the body 101, the blowout sealing hydraulic valve 104 is threadedly connected to one end of the hydraulic pipeline 110, the other end of the hydraulic pipeline 110 is connected with the No. 1 electromagnetic valve 901, and the No. 1 electromagnetic valve 901 is installed on the electromagnetic valve group device 9. The basic function of this part is that the hydraulic oil flowing through the blowout sealing hydraulic valve 104 of the hydraulic pipeline 110 is supplied through the No. 1 electromagnetic valve, the composite seal 103 is pressed, the composite seal 103 tightly holds the steel cable, and the composite seal 103 and the sealing ring 107 jointly seal the steel cable to prevent natural gas from leaking.

[0054] As shown in Figure 3 , Figure 12As shown, the double scraping device 2 comprises an outer cylinder 201, a sealing joint 202 and a brush-type scraper 203 are threadedly connected in the inner hole of the outer cylinder 201, the brush-type scraper 203 is connected with a sealing pad 204, the other side of the sealing pad 204 is sequentially provided with a spiral scraper 205 and a top sealing head 206, wherein the inner hole of the spiral scraper 205 adopts a spiral structure. The outer side wall of the outer cylinder 201 is threadedly connected with a scraper hydraulic valve 207 and a waste oil recovery valve 209, wherein the scraper hydraulic valve 207 is threadedly connected with one end of a scraper hydraulic pipeline 208, the other end of the scraper hydraulic pipeline 208 is connected with a No. 2 electromagnetic valve 902, the No. 2 electromagnetic valve 902 is installed on the electromagnetic valve group device 9; the waste oil recovery valve 209 is threadedly connected with one end of a waste oil recovery pipeline 210, the other end of the waste oil recovery pipeline 210 is connected with a waste oil recovery station 17. The basic function of this part is that the No. 2 electromagnetic valve supplies hydraulic oil flowing through the scraper hydraulic valve 207 to press the spiral scraper 205, the spiral scraper 205 and the brush-type scraper 203 jointly scrape the oil from the steel cable 16 to realize the double scraping function. The oil scraped from the steel cable 16 enters the waste oil recovery station 17 through the waste oil recovery valve 209 and the waste oil recovery pipeline 210 for recovery.

[0055] As Figure 4 , Figure 12 , Figure 13As shown, the grease injection sealing cable device 3 comprises a grease injection shell 301, a sealing pipe 302 is arranged in the inner hole of the grease injection shell 301, the sealing pipe 302 is threadedly connected with a ring groove type grease injection shaft 305, a tapered grease containing cover 303 is arranged in the hole cavity formed by the sealing pipe 302 and the ring groove type grease injection shaft 305, wherein the sealing pipe 302 and the tapered grease containing cover 303 are a multi-stage connection structure. A plug 304, a grease outlet valve 306, a grease injection sealing valve 308 and a one-way hydraulic valve 309 are threadedly connected on the outer side wall of the grease injection shell 301, wherein the grease outlet valve 306 is threadedly connected with one end of a grease outlet recovery pipeline 307, the other end of the grease outlet recovery pipeline 307 is connected with a reusable grease recovery station 18; the one-way hydraulic valve 309 is in contact with the grease injection sealing valve 308, the grease injection sealing valve 308 is threadedly connected with one end of a grease injection sealing hydraulic pipeline 310, the other end of the grease injection sealing hydraulic pipeline 310 is connected with a sealing grease injection device 12; the sealing grease injection device 12 is connected with the intelligent control system 11 through a grease injection instruction data line 1102. The basic function of this part is: when the natural gas leakage signal detected by the gas detector 15 is transmitted to the intelligent control system 11, the intelligent control system 11 controls the sealing grease injection device 12 to inject sealing grease into the annular gap between the sealing pipe 302 and the cable 16 through the grease injection sealing hydraulic pipeline 310, the grease injection sealing valve 308, the one-way hydraulic valve 309 and the ring groove type grease injection shaft 305, so as to achieve the effect of sealing the cable, at the same time, part of the grease is stored in the tapered grease containing cover 303 when the cable 16 moves, the grease stored in the tapered grease containing cover 303 plays a role in enhancing the sealing effect of the cable, the continuously injected grease and the grease stored in the tapered grease containing cover 303 jointly play a role in fully sealing the cable 16 and the sealing pipe 302, preventing natural gas leakage. At the same time, the grease reaching the reusable grease recovery station 18 through the grease outlet valve 306 and the grease outlet recovery pipeline 307 can be reused, avoiding waste of grease and saving costs.

[0056] As shown in Figure 5 The impact protection device 4 comprises an upper joint 401, one end of the upper joint 401 is sleeved with a lower joint 402 through an external thread, a impact protection mandrel 405 is arranged in the inner hole of the lower joint 402, an impact protection spring 404 and a spring seat 403 are sequentially arranged on one side of the impact protection mandrel 405, the spring seat 403 is arranged in the inner hole of the upper joint 401, and the two are threadedly connected. The impact protection spring 404 is made of stainless steel, has the characteristics of corrosion resistance and impact resistance. This part plays a role in buffering the upward impact force of the tool string 19, preventing the cable 16 from being broken due to excessive impact force.

[0057] As shown in Figure 1 The swabbing tool string containing pipe 5 is threadedly connected between the impact protection device 4 and the hydraulic eccentric fish fall prevention device 6, and the swabbing tool string containing pipe 5 plays a role in containing the swabbing tool string 19 lifted out of the wellbore during swabbing operation.

[0058] As Figure 6 shown, the hydraulic eccentric fish falling prevention device 6 includes an upper eccentric joint 601, which is sequentially threaded with an eccentric fish falling prevention shaft 602, a lower eccentric joint 603, an intermediate joint 604, and a hammer type by joint 605. As Figure 8 shown, the eccentric hole of the eccentric fish falling prevention shaft 602 is threaded with a sealing plug 608, one end of which is installed with a ball head piston 611 in the eccentric hole. The small diameter rod of the ball head piston 611 is sleeved with a return spring 612, which is in contact with the eccentric fish falling prevention shaft 602. As Figure 9 shown, the eccentric fish falling prevention shaft 602 is fixed with a fixed seat 614 in the square hole, and the both ends of the rotating shaft 615 are fixed on the fixed seat 614. The rotating shaft 615 is sleeved with a flap 613 and a torsional spring 616, one end of which is pressed against the flap 613, and the other end is fixed in the eccentric fish falling prevention shaft 602 body groove. The outer wall of the eccentric fish falling prevention shaft 602 is threaded with a fish falling prevention hydraulic valve 609, which is connected with one end of a fish falling prevention hydraulic pipeline 610, and the other end of the fish falling prevention hydraulic pipeline 610 is connected with a No. 3 electromagnetic valve 903 installed on the electromagnetic valve group device 9. The outer wall of the lower eccentric joint 603 is threaded with an explosion-proof proximity sensor 606, which is connected with one end of an explosion-proof proximity sensor signal line 607, and the other end of the explosion-proof proximity sensor signal line 607 is connected with an intelligent control system 11. The basic function of this part is that when the steel cable 16 lifts the snubbing tool string 19, the snubbing tool string 19 opens the flap 613 to reach the snubbing tool string containing pipe 5, and completes the snubbing operation, and then the flap 613 is closed under the action of the torsional spring 616, which can prevent the snubbing tool string 19 from falling into the wellbore due to the rupture of the steel cable 16. When the snubbing tool string 19 needs to descend into the wellbore for snubbing operation, the intelligent control system 11 controls the No. 3 electromagnetic valve 903 to inject hydraulic oil through the fish falling prevention hydraulic pipeline 610 and the fish falling prevention hydraulic valve 609. Figure 7As shown, the hydraulic oil pushes the ball head piston 611 to compress the reset spring 612 and push the flap 613 to open the channel, so that the swabbing tool string 19 can enter the wellbore smoothly. After the swabbing tool string 19 passes through the channel where the flap 613 is located, the reset spring 612 pushes the ball head piston 611 to reset downward, and the torsion spring 616 again compresses the flap 613 to reset and close the channel. The explosion-proof proximity sensor 606 can feed the lowering and lifting length signals of the wireline to the intelligent control system 11, and the intelligent control system 11 can process the signals to test and compare the lowering and lifting lengths, and perform zero processing of each cycle value to prevent swabbing error accumulation and improve the accuracy of swabbing depth measurement, thereby improving the efficiency of swabbing operation. The hammer type union joint 605 can quickly disconnect the hydraulic control double-acting blowout preventer 7 and the hydraulic eccentric fish falling prevention device 6, facilitating quick maintenance and other operations.

[0059] As shown in Figure 10 The hydraulic control double-acting blowout preventer 7 includes a blowout preventer body 701, two full seal pistons 702, two tool string full seal plates 703, two half seal pistons 704, and two wireline half seal plates 705 symmetrically arranged in the inner hole of the blowout preventer body 701. The shell of the blowout preventer body 701 is symmetrically connected with two full seal plate closing hydraulic valves 706, two full seal plate opening hydraulic valves 708, two half seal plate closing hydraulic valves 710, and two half seal plate opening hydraulic valves 712. The full seal plate closing hydraulic valve 706 is threadedly connected with one end of the full seal plate closing hydraulic pipeline 707, and the other end of the full seal plate closing hydraulic pipeline 707 is connected with the No. 4 solenoid valve 904 installed on the solenoid valve group device 9. The full seal plate opening hydraulic valve 708 is threadedly connected with one end of the full seal plate opening hydraulic pipeline 709, and the other end of the full seal plate opening hydraulic pipeline 709 is connected with the No. 5 solenoid valve 905 installed on the solenoid valve group device 9. The half seal plate closing hydraulic valve 710 is threadedly connected with one end of the half seal plate closing hydraulic pipeline 711, and the other end of the half seal plate closing hydraulic pipeline 711 is connected with the No. 6 solenoid valve 906 installed on the solenoid valve group device 9. The half seal plate opening hydraulic valve 712 is threadedly connected with one end of the half seal plate opening hydraulic pipeline 713, and the other end of the half seal plate opening hydraulic pipeline 713 is connected with the No. 7 solenoid valve 907 installed on the solenoid valve group device 9. The solenoid valve group device 9 is connected with the hydraulic station 10 through the hydraulic pipeline, the hydraulic station 10 is connected with the intelligent control system 11 through the hydraulic station command data line 1101, and the intelligent control system 11 is connected with the No. 1-7 solenoid valves 901-907 through the solenoid valve control data line 908.

[0060] As shown in Figure 11As shown, the intelligent wellhead device 8 includes casing pressure sensor 801, oil pressure sensor 803, electric plug valve 805, wherein the casing pressure sensor 801 is installed on the casing pressure gauge flange of the intelligent wellhead device, the casing pressure sensor 801 is connected to one end of the casing pressure sensor signal data line 802, and the other end of the casing pressure sensor signal data line 802 is connected to the intelligent control system 11; the oil pressure sensor 803 is installed on the oil pressure gauge flange of the intelligent wellhead device, the oil pressure sensor 803 is connected to one end of the oil pressure sensor signal data line 804, and the other end of the oil pressure sensor signal data line 804 is connected to the intelligent control system 11; the electric plug valve 805 is threadedly connected to the external pipeline of the intelligent wellhead device 8, the electric plug valve 805 is connected to one end of the electric plug valve control data line 806, and the other end of the electric plug valve control data line 806 is connected to the intelligent control system 11.

[0061] The basic functions of the hydraulic control double-acting blowout preventer 7 and the intelligent wellhead device 8 are as follows: the casing pressure sensor 801 and the oil pressure sensor 803 transmit the casing pressure signal to the intelligent control system 11 through the data line, if the casing pressure or the tubing pressure in the wellbore exceeds the set pressure value of the intelligent control system, the intelligent control system 11 controls the hydraulic station 10 to work through the hydraulic station command data line 1101, and provides hydraulic oil to the electromagnetic valve group device 9, at the same time, the intelligent control system 11 controls the No. 4 electromagnetic valve 904 (when the swabbing tool string 19 is located in the swabbing tool string containing pipe 5) or the No. 6 electromagnetic valve 906 (when the swabbing tool string 19 is located in the wellbore) to provide hydraulic pressure to close the tool string full seal plate 703 or the steel cable half seal plate 705, that is, to close the hydraulic control double-acting blowout preventer 7, at the same time, the intelligent control system 11 controls the electric plug valve 805 to automatically close through the electric plug valve control data line 806, that is, to automatically close the hydraulic control double-acting blowout preventer 7 and the electric plug valve 805 according to the pressure condition in the wellbore, to play the role of automatically closing the wellhead device and the oil and gas external pipeline, to ensure the safety of the operation. On the contrary, if the casing pressure or the tubing pressure in the wellbore does not exceed the set pressure value of the intelligent control system, the intelligent control system 11 controls the hydraulic control double-acting blowout preventer 7 and the electric plug valve 805 to automatically open the wellhead device and the oil and gas external pipeline, to ensure normal operation.

[0062] The application is gas well swabbing operation automatic grease injection sealing steel cable and blowout preventer, the blowout preventer 1 can hold the steel cable to prevent natural gas leakage; the double grease scraping device 2 has double grease scraping function, which can scrape off the grease adhered to the steel cable; the grease injection sealing steel cable device 3 includes ring groove type grease injection shaft 305, sealing pipe 302 and conical grease containing cover 303, which has the function of external grease filling sealing steel cable and enhancing the sealing effect of the steel cable, ensuring no natural gas leakage; the anti-impact device 4 includes anti-impact spring 404 and anti-impact mandrel 405, which has the function of buffering the upward impact force of the swabbing tool string 19; the swabbing tool string containing pipe 5 has the function of containing the swabbing tool string 19 lifted out of the wellbore; the hydraulic eccentric fish falling prevention device 6 includes flap 613, torsional spring 616, ball head piston 611 and explosion-proof proximity sensor 606, which has the functions of preventing the swabbing tool string 19 from falling into the wellbore, automatically opening the swabbing channel, collecting the lowering length and lifting length of the steel cable to ensure the swabbing accuracy; the hydraulic double-acting blowout preventer 7 includes tool string full sealing plate 703 and steel cable half sealing plate 705, which can automatically close the wellhead under the action of hydraulic pressure when the wellbore is overpressure, and automatically open the wellhead channel under normal pressure, ensuring the safety of the operation; the intelligent wellhead device 8 includes casing pressure sensor 801, oil pressure sensor 803 and electric plug valve 805, which can automatically close the export pipeline under the action of intelligent control system 11 when the wellbore is overpressure, and automatically open the export pipeline under normal pressure, ensuring the safety of the operation; the waste grease recovery station 17 has the function of recovering the grease scraped off from the steel cable by the double grease scraping device 2 and the waste liquid brought out of the wellbore by the steel cable; the reusable grease recovery station 18 has the function of recovering the overflowed grease on the grease injection sealing steel cable device 3; the intelligent control system 11 can automatically control the corresponding electromagnetic valves of the hydraulic station 10 and the electromagnetic valve group to supply hydraulic oil to close the hydraulic double-acting blowout preventer 7 and automatically control the electric plug valve 805 to close the wellhead device and the oil and gas export pipeline under the overpressure state of the casing pressure and oil pressure in the wellbore collected by the casing pressure sensor 801 and the oil pressure sensor 803, ensuring the safety of the operation. The intelligent control system 11 can automatically control the grease injection sealing steel cable device 3 to seal the steel cable according to the natural gas leakage signal detected by the gas detector 15. The intelligent control system 11 can also test and compare the lowering length and lifting length of the steel cable according to the lowering length and lifting length signals of the steel cable collected by the explosion-proof proximity sensor 606, improve the measurement accuracy of the swabbing depth, and further improve the efficiency of the swabbing operation.

Claims

1. An automatic grease sealing steel cable and blowout preventer for gas well swabbing operation, characterized in that, The application relates to a wellhead device, which comprises, in sequence, a blowout sealing device (1), a double grease scraping device (2), a grease injection sealing steel cable device (3), an impact protection device (4), a string containing pipe (5), a hydraulic eccentric anti-falling fish device (6), a hydraulic control double-acting blowout prevention device (7) and an intelligent wellhead device (8); the blowout sealing device (1), the double grease scraping device (2), the hydraulic eccentric anti-falling fish device (6) and the hydraulic control double-acting blowout prevention device (7) are connected with an electromagnetic valve group device (9) through hydraulic pipelines; the electromagnetic valve group device (9) is connected with a hydraulic station (10) through a hydraulic pipeline; the grease injection sealing steel cable device (3) is connected with a sealing grease injection device (12); the hydraulic eccentric anti-falling fish device (6), the intelligent wellhead device (8), the hydraulic station (10) and the sealing grease injection device (12) are connected with an intelligent control system (11) through signal lines; a plurality of electromagnetic valves are arranged in the electromagnetic valve group device (9), and the electromagnetic valves are connected with the intelligent control system (11); The blowout sealing device (1) comprises a body (101), a lower sealing block (102) is arranged in the inner hole of the body (101), one side of the lower sealing block (102) is in contact with the body (101), the other side of the lower sealing block (102) is sequentially provided with a composite seal (103), an upper sealing block (105) and a sealing seat (106), a sealing ring (107) is arranged in the inner hole of the sealing seat (106), the other side of the sealing seat (106) is provided with a pressing block (108), the other side of the pressing block (108) is an end cover (109), the end cover (109) is sleeved with one end of the body (101) through internal threads; a blowout sealing hydraulic valve (104) is connected to the outer side wall of the body (101), the blowout sealing hydraulic valve (104) is threadedly connected with one end of a hydraulic pipeline (110), the other end of the hydraulic pipeline (110) is connected with a No. 1 electromagnetic valve (901), and the No. 1 electromagnetic valve (901) is installed on the electromagnetic valve group device (9); The double grease scraping device (2) is connected with a waste grease liquid recovery station (17). The grease injection sealing steel cable device (3) comprises a grease injection shell (301), a sealing pipe (302) is arranged in the inner hole of the grease injection shell (301), the sealing pipe (302) is threadedly connected with a ring groove type grease injection shaft (305), a conical grease containing cover (303) is arranged in the hole cavity formed by the sealing pipe (302) and the ring groove type grease injection shaft (305), wherein the sealing pipe (302) and the conical grease containing cover (303) are a multi-stage connection structure; a plug (304), a grease outlet valve (306), a grease injection sealing valve (308) and a one-way hydraulic valve (309) are threadedly connected to the outer side wall of the grease injection shell (301), wherein the grease outlet valve (306) is threadedly connected with one end of a grease outlet recovery pipeline (307), the other end of the grease outlet recovery pipeline (307) is connected with a reusable grease recovery station (18); the one-way hydraulic valve (309) is in contact connection with the grease injection sealing valve (308), the grease injection sealing valve (308) is threadedly connected with one end of a grease injection sealing hydraulic pipeline (310), the other end of the grease injection sealing hydraulic pipeline (310) is connected with a sealing grease injection device (12); the sealing grease injection device (12) is connected with the intelligent control system (11) through a grease injection instruction data line (1102).

2. The automatic grease sealing wire line and blowout preventer device for gas well swabbing operation of claim 1, wherein, The blowout sealing device (1) is provided with a mounting seat (13), the mounting seat (13) is provided with an alarm lamp (14) and a gas detector (15), the alarm lamp (14) is connected with the intelligent control system (11) through an alarm data signal line (1104), and the gas detector (15) is connected with the intelligent control system (11) through a gas detection signal data line (1103).

3. The automatic grease sealing wire line and blowout preventer for gas well swabbing operation of claim 1, wherein, The swabbing tool string (19) is arranged in the swabbing tool string containing pipe (5), and the steel cable (16) passes through the inner holes of the blowout sealing device (1), the double grease scraping device (2), the grease injection sealing steel cable device (3), the anti-impact device (4) and the swabbing tool string containing pipe (5) in sequence and is in contact with the swabbing tool string (19).

4. The automatic grease sealing wire line and blowout preventer for gas well swabbing operation of claim 1, wherein, The double grease scraping device (2) comprises an outer cylinder (201), a sealing joint (202) and a brush type grease scraper (203) are threadedly connected in the inner hole of the outer cylinder (201), the brush type grease scraper (203) is in contact connection with a sealing pad (204), the other side of the sealing pad (204) is sequentially provided with a spiral type grease scraper (205) and a top sealing head (206), wherein the inner hole of the spiral type grease scraper (205) adopts a spiral structure; a grease scraper hydraulic valve (207) and a waste grease liquid recovery valve (209) are threadedly connected to the outer side wall of the outer cylinder (201), wherein the grease scraper hydraulic valve (207) is threadedly connected with one end of a grease scraper hydraulic pipeline (208), the other end of the grease scraper hydraulic pipeline (208) is connected with a No. 2 electromagnetic valve (902), and the No. 2 electromagnetic valve (902) is installed on an electromagnetic valve group device (9); the waste grease liquid recovery valve (209) is threadedly connected with one end of a waste grease liquid recovery pipeline (210), and the other end of the waste grease liquid recovery pipeline (210) is connected with a waste grease liquid recovery station (17).

5. The automatic grease sealing wire line and blowout preventer for gas well swabbing operation of claim 1, wherein, The anti-impact device (4) comprises an upper joint (401), one end of the upper joint (401) is sleeved with a lower joint (402) through an external thread, an anti-impact core shaft (405) is arranged in the inner hole of the lower joint (402), an anti-impact spring (404) and a spring seat (403) are sequentially arranged on one side of the anti-impact core shaft (405), the spring seat (403) is arranged in the inner hole of the upper joint (401), and the two are threadedly connected.

6. The automatic grease sealing wire line and blowout preventer for gas well swabbing operation of claim 1, wherein, The liquid-driven eccentric anti-falling fish device (6) comprises an upper eccentric joint (601), the upper eccentric joint (601) is sequentially threadedly connected with an eccentric anti-falling fish shaft (602), a lower eccentric joint (603), an intermediate joint (604) and a hammer type by joint (605); the eccentric hole of the eccentric anti-falling fish shaft (602) is threadedly connected with a sealing plug (608), one end of the sealing plug (608) is provided with a ball head piston (611) in the eccentric hole, a return spring (612) is sleeved on the small-diameter rod of the ball head piston (611), and the return spring (612) is in contact connection with the eccentric anti-falling fish shaft (602); the eccentric anti-falling fish shaft (602) is fixed with a fixed seat (614) in the square hole, both ends of a rotating shaft (615) are fixed on the fixed seat (614), a flap (613) and a torsional spring (616) are sleeved on the rotating shaft (615), one end of the torsional spring (616) is pressed against the flap (613), and the other end is fixed in the body groove of the eccentric anti-falling fish shaft (602); the outer side wall of the eccentric anti-falling fish shaft (602) is threadedly connected with an anti-falling fish hydraulic valve (609), the anti-falling fish hydraulic valve (609) is connected with one end of an anti-falling fish hydraulic pipeline (610), the other end of the anti-falling fish hydraulic pipeline (610) is connected with a No. 3 electromagnetic valve (903), and the No. 3 electromagnetic valve (903) is installed on the electromagnetic valve group device (9); the outer side wall of the lower eccentric joint (603) is threadedly connected with an anti-explosion proximity sensor (606), the anti-explosion proximity sensor (606) is connected with one end of an anti-explosion proximity sensor signal line (607), and the other end of the anti-explosion proximity sensor signal line (607) is connected with an intelligent control system (11).

7. The automatic grease sealing wire line and blowout preventer for gas well swabbing operation of claim 1, wherein, The hydraulic valves on the liquid control double-acting anti-spray device (7) are connected with electromagnetic valves arranged on the electromagnetic valve group device (9) through hydraulic pipelines; The intelligent wellhead device (8) comprises a casing pressure sensor (801), an oil pressure sensor (803) and an electric plug valve (805), wherein the casing pressure sensor (801) is installed on a casing pressure gauge flange of the intelligent wellhead device, the casing pressure sensor (801) is connected with one end of a casing pressure sensing signal data line (802), and the other end of the casing pressure sensing signal data line (802) is connected with the intelligent control system (11); the oil pressure sensor (803) is installed on an oil pressure gauge flange of the intelligent wellhead device, the oil pressure sensor (803) is connected with one end of an oil pressure sensing signal data line (804), and the other end of the oil pressure sensing signal data line (804) is connected with the intelligent control system (11); the electric plug valve (805) is threadedly connected on an external pipeline of the intelligent wellhead device (8), the electric plug valve (805) is connected with one end of an electric plug valve control data line (806), and the other end of the electric plug valve control data line (806) is connected with the intelligent control system (11).

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