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

Abstract

The invention discloses a gas well swabbing operation automatic grease injection sealing steel cable and a blowout prevention device. The gas well swabbing operation automatic grease injection sealing steel cable and blowout prevention device comprises a blowout prevention sealing device, a double grease scraping device, a grease injection sealing steel cable device, an anti-impact device, a swabbing tool string containing pipe, a hydraulic eccentric fish falling prevention device, a hydraulic control double-acting blowout prevention device and an intelligent wellhead device which are sequentially connected. The blowout prevention sealing device, the double grease scraping device, the hydraulic eccentric fish falling prevention device and the hydraulic control double-acting blowout prevention device are all connected with the electromagnetic valve set 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 electromagnetic valve set device, the hydraulic station and the sealing grease injection device are all connected with the intelligent control system through signal lines. According to the device, automatic grease injection sealing of the steel cable can be achieved, and a blowout prevention device and an oil and gas output pipeline can be automatically closed according to the pressure condition in a shaft.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas field development and production equipment, and relates to an automatic grease-injected sealing steel cable and a blowout prevention device for gas well pumping operations. Background Art

[0002] During the gas production process of oil and gas wells, accompanied by water coming out of the underground formation, serious liquid accumulation at the bottom of the well will cause wellbore flooding, poor gas production and even shutdown. In order to solve the problem of underground liquid accumulation, the production site usually uses a steel cable pumping device to pump water and produce gas. However, during the pumping and production process, the pumping 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 pumping operation, and it is very easy to cause accidents such as explosions. At the same time, this type of pumping device also has the risk of the pumping tool string connected to it falling into the wellbore due to wire jumping or breaking of the steel cable, and the salvage cost is extremely high. In addition, although steel cable grease sealing devices are now used in pumping operations, this type of grease sealing device has the following problems: (1) It is necessary to manually operate the grease sealing steel cable and the anti-fishing device at the operation site, which is labor-intensive; (2) There is also the problem that the steel cable seal is not reliable and tight, and natural gas leakage often occurs between the steel cable and the annular space of the operating device during operation, and it is also prone to explosion accidents; (3) The existing grease sealing device does not have an integrated steel cable lowering and lifting depth detection device, and there is a problem of cumulative error in the lowering and lifting depth of the steel cable, which affects the efficiency of the pumping operation; (4) This type of grease sealing device cannot realize unattended automatic grease sealing operation. In addition, the existing pumping operation cannot realize the function of automatically closing the blowout preventer and the oil and gas transmission pipeline according to the pressure conditions in the wellbore. The grease adhering to the steel cable cannot be scraped off and the grease cannot be recycled, resulting in safety risks in the existing pumping operation and high operating costs, which does not meet the actual needs of building smart oil and gas fields and reducing costs and increasing efficiency at this stage. Summary of the invention

[0003] The purpose of the present invention is to provide an automatic grease sealing steel cable and a blowout prevention device for gas well pumping operations, which can realize automatic grease sealing of the steel cable and automatically close the blowout prevention device and the oil and gas transmission pipeline according to the pressure conditions in the wellbore.

[0004] The technical solution adopted by the present invention is that the automatic grease injection sealing steel cable and blowout prevention device for gas well pumping operation include a blowout prevention sealing device, a double grease scraping device, a grease injection sealing steel cable device, an anti-impact device, a pumping tool string containing tube, a hydraulic eccentric anti-fish falling device, a hydraulically controlled double-acting blowout prevention device and an intelligent wellhead device connected in sequence; the blowout prevention sealing device, the double grease scraping device, the hydraulic eccentric anti-fish falling device and the hydraulically controlled double-acting blowout prevention device are all connected to the solenoid valve group device through a hydraulic pipeline; the solenoid valve group device is connected to a hydraulic station through a hydraulic pipeline; the grease injection sealing steel cable device is connected to a sealing grease injection device; the hydraulic eccentric anti-fish falling device, the intelligent wellhead device, the hydraulic station and the sealing grease injection device are all connected to the intelligent control system through a signal line; a plurality of solenoid valves are arranged in the solenoid valve group device, and the solenoid valves are all connected to the intelligent control system.

[0005] The present invention is also characterized in that:

[0006] A mounting seat is provided at the anti-blowout sealing device, and an alarm light and a gas detector are provided on the mounting seat. The alarm light is connected to the intelligent control system through an alarm data signal line, and the gas detector is connected to the intelligent control system through a gas detection signal data line.

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

[0008] A pumping tool string is placed in the pumping tool string accommodating tube, and the steel cable passes through the anti-blowout sealing device, the double grease scraping device, the grease injection sealing steel cable device, the anti-impact device, the inner hole of the pumping tool string accommodating tube in sequence and contacts the pumping tool string.

[0009] The anti-blowout sealing device includes a main body, a lower sealing block is arranged in the inner hole of the main body, one side of the lower sealing block is in contact with the main body, and the other side 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, a pressure block is arranged on the other side of the sealing seat, and the other side of the pressure block is an end cover, which is sleeved with one end of the main body through an internal thread; an anti-blowout sealing hydraulic valve is connected to the outer side wall of the main body, the anti-blowout sealing hydraulic valve is threadedly connected to one end of the hydraulic pipeline, and the other end of the hydraulic pipeline is connected to the No. solenoid valve, and the No. solenoid valve is installed on the solenoid valve group device.

[0010] The double grease scraper device includes an outer cylinder, a sealing joint and a brush-type grease scraper are threadedly connected in the inner hole of the outer cylinder, the brush-type grease scraper is in contact with the sealing gasket, and a spiral grease scraper and a top sealing head are arranged in sequence on the other side of the sealing gasket, wherein the inner hole of the spiral grease scraper adopts a spiral structure; a grease scraper hydraulic valve and a waste grease liquid recovery valve are threadedly connected on the outer wall of the outer cylinder, wherein the grease scraper hydraulic valve is threadedly connected to one end of the grease scraper hydraulic pipeline, and the other end of the grease scraper hydraulic pipeline is connected to a No. solenoid valve, and the No. solenoid valve is installed on the solenoid valve group device; the waste grease liquid recovery valve is threadedly connected to one end of the waste grease liquid recovery pipeline, and the other end of the waste grease liquid recovery pipeline is connected to a waste grease liquid recovery station.

[0011] The grease injection sealing steel cable device includes a grease injection shell, a sealing tube is arranged in the inner hole of the grease injection shell, the sealing tube is threadedly connected with the annular groove type grease injection shaft, a conical grease cover is arranged in the hole formed by the sealing tube and the annular groove type grease injection shaft, wherein the sealing tube and the conical grease 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 wall of the grease injection shell, wherein the grease outlet valve is threadedly connected with one end of the grease outlet recovery pipeline, and the other end of the grease outlet recovery pipeline is connected with a reusable grease recovery station; the one-way hydraulic valve is contact-connected with the grease injection sealing valve, the grease injection sealing valve is threadedly connected with one end of the grease injection sealing hydraulic pipeline, and the other end of the grease injection sealing hydraulic pipeline is connected with the sealing grease injection device; the sealing grease injection device is connected with the intelligent control system through a grease injection command data line.

[0012] The anti-impact device includes an upper joint, one end of which is connected to a lower joint through an external thread, an anti-impact core shaft is arranged in the inner hole of the lower joint, an anti-impact spring and a spring seat are arranged in sequence on one side of the anti-impact core shaft, and the spring seat is arranged in the inner hole of the upper joint, and the two are threadedly connected.

[0013] The hydraulic eccentric anti-fish-falling device comprises an upper eccentric joint, which is threadedly connected with an eccentric anti-fish-falling shaft, a lower eccentric joint, an intermediate joint and a hammer-type union joint in sequence; a sealing plug is threadedly connected in the eccentric hole of the eccentric anti-fish-falling shaft, a ball head piston is installed in the eccentric hole at one end of the sealing plug, a return spring is sleeved on the small-diameter rod of the ball head piston, and the return spring is in contact with the eccentric anti-fish-falling shaft; a fixing seat is fixed in the square hole of the eccentric anti-fish-falling shaft, both ends of the rotating shaft are fixed on the fixing seat, and a flap and a torsion bar are sleeved on the rotating shaft Spring, one end of the torsion spring presses the flap, and the other end is fixed in the groove of the eccentric anti-fish falling shaft body; the anti-fish falling hydraulic valve is threadedly connected on the outer wall of the eccentric anti-fish falling shaft, the anti-fish falling hydraulic valve is connected to one end of the anti-fish falling hydraulic pipeline, the other end of the anti-fish falling hydraulic pipeline is connected to the No. solenoid valve, and the No. solenoid valve is installed on the solenoid valve group device; the explosion-proof proximity sensor is threadedly connected on the outer wall of the lower eccentric joint, the explosion-proof proximity sensor is connected to one end of the explosion-proof proximity sensor signal line, and the other end of the explosion-proof proximity sensor signal line is connected to the intelligent control system.

[0014] The hydraulic valves on the hydraulically controlled double-acting blowout prevention device are all connected to the solenoid valves arranged on the solenoid valve group device through hydraulic pipelines;

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

[0016] The beneficial effects of the present invention are:

[0017] The automatic grease sealing steel cable and blowout prevention device of the present invention are used in the process of pumping, drainage and gas production in oil and gas fields. The intelligent control system of the device can realize the unattended automatic grease sealing of the steel cable according to the feedback signals of the gas detector, explosion-proof proximity sensor, casing pressure sensor and oil pressure sensor; the lowering length of the steel cable and the lifting length are tested and compared to improve the measurement accuracy of the pumping depth, thereby improving the operation efficiency; the blowout prevention device and the oil and gas transmission pipeline are automatically closed according to the pressure condition in the wellbore to ensure the safety of the operation. In addition, the device of the present invention also has the function of double scraping grease, which can scrape off the grease adhering to the steel cable to prevent natural gas leakage; it also has the functions of buffering the upward impact force of the pumping tool string, hydraulically controlled anti-falling fish, intelligent control solenoid valve to provide liquid pressure for each part of the device, automatic recovery of waste grease liquid, and recycling of clean grease again, etc., realizing intelligent, unattended automatic grease injection and opening and closing of wellheads and transmission pipelines, etc., improving the safety and efficiency of the operation, reducing the intensity of the operation and the cost of the operation, and meeting the actual needs of building smart oil and gas fields and reducing costs and increasing efficiency at this stage. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0019] Figure 2 It is a schematic structural diagram of the anti-blowout sealing device in the device of the present invention;

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

[0021] Figure 4 It is a schematic structural diagram of a grease-injected sealed steel cable device in the device of the present invention;

[0022] Figure 5It is a schematic diagram of the structure of the anti-impact device in the device of the present invention;

[0023] Figure 6 It is a structural schematic diagram of the hydraulic eccentric fish-falling prevention device in the device of the present invention in a closed state;

[0024] Figure 7 It is a structural schematic diagram of the hydraulic eccentric anti-fish falling device in the device of the present invention in an open state;

[0025] Figure 8 yes Figure 6 A schematic diagram of the partially enlarged structure at center A;

[0026] Fig. 9 yes Figure 6 Schematic diagram of the structure in the middle B direction;

[0027] Fig.10 It is a structural schematic diagram of a hydraulically controlled double-acting blowout prevention device in the device of the present invention;

[0028] Fig.11 It is a structural schematic diagram of the intelligent wellhead device in the device of the present invention;

[0029] Fig.12 It is a structural schematic diagram of the solenoid valve group device in the device of the present invention;

[0030] Fig.13 It is a structural schematic diagram of the intelligent control system in the device of the present invention;

[0031] Fig.14 It is a structural schematic diagram of the sealing grease injection device in the device of the present invention.

[0032] In the figure, 1. blowout prevention sealing device, 101. body, 102. lower sealing block, 103. composite seal, 104. blowout prevention 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 scraper device, 201. Outer cylinder, 202. Sealing joint, 203. Brush grease scraper, 204. Sealing pad, 205. Spiral grease scraper, 206. Top sealing head, 207. Grease scraper hydraulic valve, 208. Grease scraper hydraulic pipeline, 209. Waste grease liquid recovery valve, 210. Waste grease liquid recovery pipeline;

[0034] 3. Grease injection sealing steel cable device, 301. Grease injection housing, 302. Sealing tube, 303. Conical grease 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. Pumping tool string receiving tube;

[0037] 6. Hydraulic eccentric anti-fish falling device, 601. Upper eccentric joint, 602. Eccentric anti-fish falling shaft, 603. Lower eccentric joint, 604. Intermediate joint, 605. Hammer type union joint, 606. Explosion-proof proximity sensor, 607. Explosion-proof proximity sensor signal line, 608. Sealing plug, 609. Anti-fish falling hydraulic valve, 610. Anti-fish falling hydraulic pipeline, 611. Ball head piston, 612. Return spring, 613. Flap, 614. Fixed seat, 615. Rotating shaft, 616. Torsion spring, 617. Fixing screw;

[0038] 7. Hydraulic control double-acting blowout preventer, 701. Blowout preventer body, 702. Fully sealed piston, 703. Fully sealed plate for tool string, 704. Half-sealed piston, 705. Half-sealed plate for steel cable, 706. Fully sealed plate to close hydraulic valve, 707. Fully sealed plate to close hydraulic pipeline, 708. Fully sealed plate to open hydraulic valve, 709. Fully sealed plate to open hydraulic pipeline, 710. Half-sealed plate to close hydraulic valve, 711. Half-sealed plate to close hydraulic pipeline, 712. Half-sealed plate to open hydraulic valve, 713. Half-sealed plate to open hydraulic pipeline, 714. Connecting bolts;

[0039] 8. Intelligent wellhead device, 801. Casing pressure sensor, 802. Casing pressure sensor signal data line, 803. Oil pressure sensor, 804. Oil pressure sensor signal data line, 805. Electric plug valve, 806. Electric plug valve control data line;

[0040] 9. Solenoid valve assembly, No. 901.1 solenoid valve, No. 902.2 solenoid valve, No. 903.3 solenoid valve, No. 904.4 solenoid valve, No. 905.5 solenoid valve, No. 906.6 solenoid valve, No. 907.7 solenoid valve, 908. Solenoid valve control data line;

[0041] 10. Hydraulic station;

[0042] 11. Intelligent control system, 1101. Hydraulic station command data line, 1102. Grease injection command data line, 1103. Gas detection signal data line, 1104. Alarm data signal line;

[0043] 12. Sealing grease injection device, 13. Mounting seat, 14. Warning light, 15. Gas detector, 16. Steel cable, 17. Waste grease liquid recovery station, 18. Reusable grease recovery station, 19. Pumping tool string. DETAILED DESCRIPTION

[0044] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] Example 1

[0046] The invention discloses an automatic grease-filled sealing steel cable and a blowout prevention device for gas well pumping operation, the structure of which is as follows Figure 1 As shown, it includes a blowout-proof sealing device 1, a double grease scraping device 2, a grease injection sealing steel cable device 3, an anti-impact device 4, a pumping tool string containing tube 5, a hydraulic eccentric anti-fish falling device 6 and a hydraulically controlled double-acting blowout-proof device 7, which are threadedly connected in sequence. The hydraulically controlled double-acting blowout-proof device 7 is fixedly connected to an intelligent wellhead device 8 through a connecting bolt 714. The blowout-proof sealing device 1, the double grease scraping device 2, the hydraulic eccentric anti-fish falling device 6, and the hydraulically controlled double-acting blowout-proof device 7 are all connected to the solenoid valve group device 9 through a hydraulic pipeline; the solenoid valve group device 9 is connected to a hydraulic station 10 through a hydraulic pipeline; the grease injection sealing steel cable device 3 is connected to a sealing grease injection device 12; the hydraulic eccentric anti-fish falling device 6, the intelligent wellhead device 8, the hydraulic station 10, and the sealing grease injection device 12 are all connected to an intelligent control system 11 through a signal line; a plurality of solenoid valves are arranged in the solenoid valve group device 9, and the solenoid valves are all connected to the intelligent control system 11.

[0047] Example 2

[0048] On the basis of Example 1, a mounting seat 13 is provided at the anti-blowout sealing device 1, and an alarm light 14 and a gas detector 15 are provided on the mounting seat 13. The alarm light 14 is connected to the intelligent control system 11 through an alarm data signal line 1104, and the gas detector 15 is connected to the intelligent control system 11 through a gas detection signal data line 1103. The double grease scraping device 2 is connected to a waste grease liquid recovery station 17, and the grease injection sealing cable device 3 is connected to a reusable grease recovery station 18.

[0049] Example 3

[0050] The invention discloses an automatic grease-filled sealing steel cable and a blowout prevention device for gas well pumping operation, the structure of which is as follows Figure 1 As shown, it includes a blowout prevention sealing device 1, a double grease scraping device 2, a grease injection sealing steel cable device 3, an anti-impact device 4, a pumping tool string accommodating tube 5, a hydraulic eccentric anti-fish falling device 6 and a hydraulically controlled double-acting blowout prevention device 7 which are threadedly connected in sequence. The hydraulically controlled double-acting blowout prevention device 7 is fixedly connected to an intelligent wellhead device 8 via a connecting bolt 714.

[0051] The blowout-proof sealing device 1 is in contact with the mounting seat 13, and the mounting seat 13 is equipped with an alarm light 14 and a gas detector 15, which are connected to the intelligent control system 11 through the alarm data signal line 1104 and the gas detection signal data line 1103, respectively. The basic function of this part is: when the gas detector 15 detects that the natural gas leaks from the top of the blowout-proof sealing device 1, the signal is transmitted to the intelligent control system 11, and the intelligent control system 11 controls the alarm light 14 to flash, which serves as a warning reminder. At the same time, the intelligent control system 11 intelligently controls the sealing grease injection device 12 to automatically inject grease to seal the steel cable to ensure that the natural gas does not leak again.

[0052] The steel cable 16 passes through the anti-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 inner hole of the pumping tool string accommodating tube 5 in sequence, and is in contact with the pumping tool string 19, and the pumping tool string 19 stays in the pumping tool string accommodating tube 5. The basic function of this part is: the steel cable 16 is in contact with the pumping tool string 19, and the pumping tool string 19 lifted up during operation stays in the pumping tool string accommodating tube 5.

[0053] like Figure 2 , Fig.12 As shown, the anti-blowout sealing device 1 includes 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 vulcanized, and has the characteristics of wear resistance, grease resistance, high elasticity, etc. A sealing ring 107 is arranged in the inner hole of the sealing seat 106, and a pressing block 108 is arranged on the other side of the sealing seat 106. The other side of the pressing block 108 is an end cover 109, and the end cover 109 is sleeved with one end of the body 101 through an internal thread. The outer wall of the body 101 is threadedly connected with an anti-blowout sealing hydraulic valve 104, and the anti-blowout sealing hydraulic valve 104 is threadedly connected with one end of a hydraulic pipeline 110, and 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: to supply hydraulic oil to the hydraulic pipeline 110 through the No. 1 solenoid valve to flow through the anti-blowout sealing hydraulic valve 104, to compress the composite seal 103, so that the composite seal 103 holds the steel cable tightly, and the composite seal 103 and the sealing ring 107 work together to seal the steel cable to prevent natural gas leakage.

[0054] like Figure 3 , Fig.12As shown, the double grease scraper device 2 includes an outer cylinder 201, a sealing joint 202 and a brush grease scraper 203 are threadedly connected in the inner hole of the outer cylinder 201, the brush grease scraper 203 is in contact with the sealing gasket 204, and a spiral grease scraper 205 and a top sealing head 206 are arranged on the other side of the sealing gasket 204 in sequence, wherein the inner hole of the spiral grease scraper 205 adopts a spiral structure. A grease scraper hydraulic valve 207 and a waste grease liquid recovery valve 209 are threadedly connected on the outer wall of the outer cylinder 201, wherein the grease scraper hydraulic valve 207 is threadedly connected to one end of the grease scraper hydraulic pipeline 208, and the other end of the grease scraper hydraulic pipeline 208 is connected to the No. 2 solenoid valve 902, and the No. 2 solenoid valve 902 is installed on the solenoid valve group device 9; the waste grease liquid recovery valve 209 is threadedly connected to one end of the waste grease liquid recovery pipeline 210, and the other end of the waste grease liquid recovery pipeline 210 is connected to the waste grease liquid recovery station 17. The basic function of this part is: the hydraulic oil supplied by the No. 2 solenoid valve to the hydraulic pipeline 208 flows through the hydraulic valve 207 of the grease scraper to press the spiral grease scraper 205, and the spiral grease scraper 205 and the brush grease scraper 203 work together to scrape the grease from the steel cable 16, realizing the double grease scraping function. The grease scraped from the steel cable 16 enters the waste grease liquid recovery station 17 through the waste grease liquid recovery valve 209 and the waste grease liquid recovery pipeline 210 for recovery.

[0055] like Figure 4 , Fig.12 , Fig.13As shown, the grease injection sealing steel cable device 3 includes a grease injection shell 301, a sealing tube 302 is arranged in the inner hole of the grease injection shell 301, the sealing tube 302 is threadedly connected with the ring groove type grease injection shaft 305, and a conical grease cover 303 is arranged in the hole cavity formed by the sealing tube 302 and the ring groove type grease injection shaft 305, wherein the sealing tube 302 and the conical grease 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 to one end of a grease outlet recovery pipeline 307, and the other end of the grease outlet recovery pipeline 307 is connected to 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 to one end of a grease injection sealing hydraulic pipeline 310, and the other end of the grease injection sealing hydraulic pipeline 310 is connected to a sealing grease injection device 12; the sealing grease injection device 12 is connected to the intelligent control system 11 via 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 formed by the steel cable 16 and the sealing tube 302 through the grease injection sealing hydraulic pipeline 310, the grease injection sealing valve 308, the one-way hydraulic valve 309, and the annular groove type grease injection shaft 305, so as to achieve the effect of sealing the steel cable. At the same time, part of the grease of the steel cable 16 is stored in the conical grease cover 303 when it moves. The grease stored in the conical grease cover 303 plays a role in enhancing the sealing effect of the steel cable. The continuously injected grease and the grease stored in the conical grease cover 303 work together to fully seal the annular gap between the steel cable 16 and the sealing tube 302, thereby preventing natural gas leakage. At the same time, the grease that reaches the reusable grease recycling station 18 through the grease outlet valve 306 and the grease outlet recovery pipeline 307 can be recycled again, avoiding grease waste and saving costs.

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

[0057] like Figure 1 As shown, the pumping tool string accommodating tube 5 is threadedly connected to the anti-impact device 4 and the hydraulic eccentric anti-fish falling device 6. The pumping tool string accommodating tube 5 serves to accommodate the pumping tool string 19 lifted from the wellbore during the pumping operation.

[0058] like Figure 6 As shown, the hydraulic eccentric anti-fish falling device 6 comprises an upper eccentric joint 601, and the upper eccentric joint 601 is threadedly connected with an eccentric anti-fish falling shaft 602, a lower eccentric joint 603, an intermediate joint 604 and a hammer-type union joint 605 in sequence, wherein, as Figure 8 As shown, a sealing plug 608 is threadedly connected in the eccentric hole of the eccentric anti-fishing shaft 602, a ball piston 611 is installed in the eccentric hole at one end of the sealing plug 608, a return spring 612 is sleeved on the small diameter rod of the ball piston 611, and the return spring 612 is in contact with the eccentric anti-fishing shaft 602. Fig. 9 As shown, a fixing seat 614 is fixed in the square hole of the eccentric anti-fish falling shaft 602, and both ends of the rotating shaft 615 are fixed on the fixing seat 614. A flap 613 and a torsion spring 616 are mounted on the rotating shaft 615. One end of the torsion spring 616 presses the flap 613, and the other end is fixed in the body groove of the eccentric anti-fish falling shaft 602. The anti-fish falling hydraulic valve 609 is threadedly connected on the outer wall of the eccentric anti-fish falling shaft 602. The anti-fish falling hydraulic valve 609 is connected to one end of the anti-fish falling hydraulic pipeline 610. The other end of the anti-fish falling hydraulic pipeline 610 is connected to the No. 3 electromagnetic valve 903, and the No. 3 electromagnetic valve 903 is installed on the electromagnetic valve group device 9. The explosion-proof proximity sensor 606 is threadedly connected on the outer wall of the lower eccentric joint 603. The explosion-proof proximity sensor 606 is connected to one end of the explosion-proof proximity sensor signal line 607, and the other end of the explosion-proof proximity sensor signal line 607 is connected to the intelligent control system 11. The basic function of this part is: when the steel cable 16 lifts the pumping tool string 19, the pumping tool string 19 pushes the flap 613 to reach the pumping tool string accommodating tube 5 to complete the pumping operation, and then the flap 613 closes the channel under the action of the torsion spring 616 to prevent the pumping tool string 19 from falling into the wellbore due to the breakage of the steel cable 16. When the pumping tool string 19 needs to go down into the wellbore for pumping operations, the intelligent control system 11 controls the No. 3 solenoid valve 903 to inject hydraulic oil through the anti-fish falling hydraulic pipeline 610 and the anti-fish falling hydraulic valve 609, such as Figure 7As shown, the hydraulic oil pushes the ball piston 611 to compress the reset spring 612 upward and push open the flap 613, the channel is opened, and the pumping tool string 19 can smoothly enter the wellbore for operation. After the pumping tool string 19 passes through the channel where the flap 613 is located, the reset spring 612 pushes the ball piston 611 downward to reset, and the torsion spring 616 presses the flap 613 again to reset the flap 613 to close the channel. The explosion-proof proximity sensor 606 can feed back the steel cable lowering length and lifting length signals to the intelligent control system 11. After the intelligent control system 11 calculates and processes, the steel cable lowering length and lifting length are tested and compared and analyzed, and the value is reset to zero for each cycle to prevent the accumulation of pumping errors, improve the pumping depth measurement accuracy, and thus improve the efficiency of the pumping operation. The hammer-type union joint 605 can quickly disconnect the hydraulically controlled double-acting blowout preventer 7 from the hydraulically driven eccentric anti-fish falling device 6, which is convenient for quick maintenance and other operations.

[0059] like Fig.10 As shown, the hydraulically controlled double-acting blowout preventer 7 includes a blowout preventer body 701, in which two fully sealed pistons 702, two tool string fully sealed plates 703, two semi-sealed pistons 704, and two steel cable semi-sealed plates 705 are symmetrically arranged in the inner hole of the blowout preventer body 701. Two fully sealed plate closing hydraulic valves 706, two fully sealed plate opening hydraulic valves 708, two semi-sealed plate closing hydraulic valves 710, and two semi-sealed plate opening hydraulic valves 712 are symmetrically threadedly connected on the shell of the blowout preventer body 701, wherein the fully sealed plate closing hydraulic valve 706 is threadedly connected to one end of the fully sealed plate closing hydraulic pipeline 707, and the other end of the fully sealed plate closing hydraulic pipeline 707 is connected to the No. 4 solenoid valve 904, which is installed on the solenoid valve assembly device 9; the fully sealed plate opening hydraulic valve 708 is threadedly connected to one end of the fully sealed plate opening hydraulic pipeline 709, and the fully sealed plate opening hydraulic valve 710 is threadedly connected to the fully sealed plate opening hydraulic pipeline 709. The other end of the pipeline 709 is connected to the No. 5 solenoid valve 905, which is installed on the solenoid valve group device 9; the semi-closed plate closing hydraulic valve 710 is threadedly connected to one end of the semi-closed plate closing hydraulic pipeline 711, and the other end of the semi-closed plate closing hydraulic pipeline 711 is connected to the No. 6 solenoid valve 906, which is installed on the solenoid valve group device 9; the semi-closed plate opening hydraulic valve 712 is threadedly connected to one end of the semi-closed plate opening hydraulic pipeline 713, and the other end of the semi-closed plate opening hydraulic pipeline 713 is connected to the No. 7 solenoid valve 907, which is installed on the solenoid valve group device 9. The solenoid valve group device 9 is connected to the hydraulic station 10 through the hydraulic pipeline, and the hydraulic station 10 is connected to the intelligent control system 11 through the hydraulic station command data line 1101, and the intelligent control system 11 is respectively connected to the No. 1 to No. 7 solenoid valves 901 to 907 through the solenoid valve control data line 908.

[0060] like Fig.11As shown, the intelligent wellhead device 8 includes 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 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 transmission 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 hydraulically controlled double-acting blowout prevention device 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 oil pipe pressure in the wellbore exceeds the pressure value set by 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 solenoid valve group device 9. At the same time, the intelligent control system 11 controls the No. 4 solenoid valve 904 (the pumping tool string 1) through the solenoid valve control data line 908. 9 is located in the pumping tool string containing pipe 5) or solenoid valve 6 906 (when the pumping tool string 19 is located in the wellbore) provides hydraulic pressure to close the tool string full sealing plate 703 or the steel cable half sealing plate 705, that is, to close the hydraulic 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 double-acting blowout preventer 7 and the electric plug valve 805 according to the pressure condition in the wellbore, which plays the role of automatically closing the wellhead device and the oil and gas export pipeline to ensure the safety of the operation. On the contrary, if the casing pressure or the oil pipe pressure in the wellbore does not exceed the pressure value set by the intelligent control system, the intelligent control system 11 controls the hydraulic double-acting blowout preventer 7 and the electric plug valve 805 to automatically open the wellhead device and the oil and gas export pipeline to ensure normal operation.

[0062] The invention discloses an automatic grease-filled sealing steel cable and a blowout prevention device for gas well pumping operation. The blowout prevention sealing device 1 can hold the steel cable tightly to prevent natural gas leakage. The double grease scraping device 2 has a double grease scraping function and can scrape off the grease adhering to the steel cable. The grease-filled sealing steel cable device 3 comprises an annular groove type grease-filled shaft 305, a sealing tube 302 and a conical grease cover 303, which has the functions of externally filling grease to seal the steel cable and enhancing the sealing effect of the steel cable to ensure that there is no natural gas leakage. The anti-impact device 4 comprises an anti-impact spring 404 and an anti-impact mandrel 405, which has a buffer function. The pumping tool string 19 has the function of exerting upward impact force; the pumping tool string accommodating tube 5 has the function of accommodating the pumping tool string 19 lifted from the wellbore; the hydraulic eccentric anti-fishing device 6 includes a flap 613, a torsion spring 616, a ball head piston 611, and an explosion-proof proximity sensor 606, which has the functions of preventing the pumping tool string 19 from falling into the wellbore, automatically opening the pumping channel with hydraulic control, and collecting the length of the steel cable lowered and lifted to ensure the pumping accuracy; the hydraulically controlled double-acting anti-blowout device 7 includes a tool string full sealing plate 703, a steel cable half sealing plate 70 5, when the wellbore is over-pressured, the wellhead can be automatically closed under the action of the hydraulic pressure, and the wellhead channel can be automatically opened under normal pressure to ensure the safety of the operation; the intelligent wellhead device 8 includes a casing pressure sensor 801, an oil pressure sensor 803, and an electric plug valve 805, which can automatically close the external transmission pipeline under the action of the intelligent control system 11 when the wellbore is over-pressured, and automatically open the external transmission pipeline under normal pressure to ensure the safety of the operation; the waste grease liquid recovery station 17 has the function of recovering the grease scraped off the steel cable by the double scraping device 2 and the waste liquid brought out of the wellbore by the steel cable ; The grease recovery station 18 can be reused to recover the grease overflowed from the grease-injected sealing cable device 3; the intelligent control system 11 can automatically control the hydraulic station 10 and the corresponding solenoid valve on the solenoid valve group to supply hydraulic oil according to the casing pressure in the wellbore collected by the casing pressure sensor 801 and the oil pressure sensor 803 in the overpressure state, so as to close the hydraulic double-acting blowout prevention device 7, and automatically control the closing of the electric plug valve 805, so as to close the wellhead device and the oil and gas transmission pipeline and ensure the safety of the operation. The intelligent control system 11 automatically controls the grease-injected sealing cable device 3 to automatically inject grease to seal the 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 cable lowering length and the cable lifting length according to the steel cable lowering length and lifting length signals collected by the explosion-proof proximity sensor 606, and improve the measurement accuracy of the pumping depth, thereby improving the efficiency of the pumping operation.

Claims

1. Automatic grease sealing steel cable and blowout prevention device for gas well pumping operation, characterized in that: The invention comprises a blowout prevention sealing device (1), a double grease scraping device (2), a grease injection sealing steel cable device (3), an anti-impact device (4), a pumping tool string containing pipe (5), a hydraulic eccentric anti-fish falling device (6), a hydraulically controlled double-acting blowout prevention device (7) and an intelligent wellhead device (8) which are connected in sequence; the blowout prevention sealing device (1), the double grease scraping device (2), the hydraulic eccentric anti-fish falling device (6) and the hydraulically controlled double-acting blowout prevention device (7) are all connected to an electromagnetic valve group device (9) through a hydraulic pipeline; the electromagnetic valve group device (9) is connected to a hydraulic station (10) through a hydraulic pipeline; the grease injection sealing steel cable device (3) is connected to a sealing grease injection device (12); the hydraulic eccentric anti-fish falling device (6), the intelligent wellhead device (8), the hydraulic station (10) and the sealing grease injection device (12) are all connected to an intelligent control system (11) through a signal line; and a plurality of electromagnetic valves are arranged in the electromagnetic valve group device (9), and the electromagnetic valves are all connected to the intelligent control system (11).

2. The automatic grease-injected sealing steel cable and blowout prevention device for gas well pumping operation according to claim 1 is characterized in that: The anti-blowout sealing device (1) is provided with a mounting seat (13), and the mounting seat (13) is provided with an alarm light (14) and a gas detector (15), 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).

3. The automatic grease-injected sealing steel cable and blowout prevention device for gas well pumping operation according to claim 1 is characterized in that: The double grease scraping device (2) is connected to a waste grease liquid recovery station (17), and the grease injection sealing steel cable device (3) is connected to a reusable grease recovery station (18).

4. The automatic grease-injected sealing steel cable and blowout prevention device for gas well pumping operation according to claim 1 is characterized in that: A pumping tool string (19) is placed in the pumping tool string accommodating tube (5), and the steel cable (16) passes through the anti-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 inner hole of the pumping tool string accommodating tube (5) in sequence, and contacts the pumping tool string 19.

5. The automatic grease-injected sealing steel cable and blowout prevention device for gas well pumping operation according to claim 1 is characterized in that: The anti-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), a sealing ring (107) is arranged in the inner hole of the sealing seat (106), and a pressure block (108) is arranged on the other side of the sealing seat (106). The other side of the block (108) is an end cover (109), which is sleeved with one end of the body (101) through an internal thread; an anti-blowout sealing hydraulic valve (104) is connected to the outer wall of the body (101), the anti-blowout sealing hydraulic valve (104) is threadedly connected to one end of a hydraulic pipeline (110), and the other end of the hydraulic pipeline (110) is connected to a No. 1 solenoid valve (901), and the No. 1 solenoid valve (901) is installed on the solenoid valve assembly device (9).

6. The automatic grease-injected sealing steel cable and blowout prevention device for gas well pumping operation according to claim 3 is characterized in that: The double grease scraper 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 with a sealing gasket (204), and a spiral grease scraper (205) and a top sealing head (206) are sequentially arranged on the other side of the sealing gasket (204), wherein the inner hole of the spiral grease scraper (205) adopts a spiral structure; a grease scraper hydraulic valve (206) is threadedly connected on the outer wall of the outer cylinder (201) 207) and a waste grease liquid recovery valve (209), wherein the scraper hydraulic valve (207) is threadedly connected to one end of the scraper hydraulic pipeline (208), and the other end of the scraper hydraulic pipeline (208) is connected to a No. 2 solenoid valve (902), and the No. 2 solenoid valve (902) is installed on the solenoid valve group device (9); the waste grease liquid recovery valve (209) is threadedly connected to one end of the waste grease liquid recovery pipeline (210), and the other end of the waste grease liquid recovery pipeline (210) is connected to a waste grease liquid recovery station (17).

7. The automatic grease-injected sealing steel cable and blowout prevention device for gas well pumping operation according to claim 3 is characterized in that: The grease injection sealing steel cable device (3) comprises a grease injection housing (301), a sealing tube (302) is arranged in the inner hole of the grease injection housing (301), the sealing tube (302) is threadedly connected to a ring groove type grease injection shaft (305), a conical grease cover (303) is arranged in the hole formed by the sealing tube (302) and the ring groove type grease injection shaft (305), wherein the sealing tube (302) and the conical grease 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 are threadedly connected on the outer wall of the grease injection housing (301). (309), wherein the grease outlet valve (306) is threadedly connected to one end of the grease outlet recovery pipeline (307), and the other end of the grease outlet recovery pipeline (307) is connected to the reusable grease recovery station (18); the one-way hydraulic valve (309) is contact-connected with the grease injection sealing valve (308), the grease injection sealing valve (308) is threadedly connected to one end of the grease injection sealing hydraulic pipeline (310), and the other end of the grease injection sealing hydraulic pipeline (310) is connected to the sealing grease injection device (12); the sealing grease injection device (12) is connected to the intelligent control system (11) via the grease injection instruction data line (1102).

8. The automatic grease-injected sealing steel cable and blowout prevention device for gas well pumping operation according to claim 1 is characterized in that: The anti-impact device (4) comprises an upper joint (401), one end of the upper joint (401) is sleeved with a lower joint (402) via 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 arranged in sequence on one side of the anti-impact core shaft (405), and the spring seat (403) is arranged in the inner hole of the upper joint (401), and the two are threadedly connected.

9. The automatic grease-injected sealing steel cable and blowout prevention device for gas well pumping operation according to claim 1 is characterized in that: The hydraulic eccentric fish-falling prevention device (6) comprises an upper eccentric joint (601), wherein the upper eccentric joint (601) is threadedly connected with an eccentric fish-falling prevention shaft (602), a lower eccentric joint (603), an intermediate joint (604) and a hammer-type union joint (605) in sequence; a sealing plug (608) is threadedly connected in the eccentric hole of the eccentric fish-falling prevention shaft (602), a ball head piston (611) is installed in the eccentric hole at one end of the sealing plug (608), 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 with the eccentric fish-falling prevention shaft (602); a fixing seat (614) is fixed in the square hole of the eccentric fish-falling prevention shaft (602), two ends of a rotating shaft (615) are fixed on the fixing seat (614), and a turning spring (615) is sleeved on the rotating shaft (615). The invention relates to a fish-proofing device (601) and a torsion spring (616), wherein one end of the torsion spring (616) presses the flap (613) and the other end is fixed in the body groove of the eccentric fish-proofing shaft (602); the outer wall of the eccentric fish-proofing shaft (602) is threadedly connected to an anti-fish-proof hydraulic valve (609), the anti-fish-proof hydraulic valve (609) is connected to one end of an anti-fish-proof hydraulic pipeline (610), the other end of the anti-fish-proof hydraulic pipeline (610) is connected to a No. 3 electromagnetic valve (903), and the No. 3 electromagnetic valve (903) is installed on the electromagnetic valve assembly device (9); the outer wall of the lower eccentric joint (603) is threadedly connected to an explosion-proof proximity sensor (606), the explosion-proof proximity sensor (606) is connected to 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 to an intelligent control system (11).

10. The automatic grease-injected sealing steel cable and blowout prevention device for gas well pumping operation according to claim 1, characterized in that: The hydraulic valves on the hydraulically controlled double-acting blowout prevention device (7) are all connected to the solenoid valves arranged on the solenoid valve assembly device (9) via 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 the casing pressure gauge flange of the intelligent wellhead device, the casing pressure sensor (801) is connected to 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 to an 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 an oil pressure sensing signal data line (804), and the other end of the oil pressure sensing signal data line (804) is connected to the intelligent control system (11); the electric plug valve (805) is threadedly connected to the external transmission pipeline of the intelligent wellhead device (8), the electric plug valve (805) is connected to 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 to the intelligent control system (11).

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