Mechanical gas well blowout jetting plugging device

Abstract

A mechanical gas well blowout jet flow plugging removal device belongs to oil production process technical field, including oil pipe nitrogen vehicle, pumping rod nitrogen vehicle, four-way joint, hose, hollow pumping rod, oil pipe, nozzle, expansion type packer, claw spring, telescopic rod, dead plug, pressure relief solenoid valve and blowout groove, upper oil pipe is connected with lower oil pipe through nozzle, four passages of four-way joint are connected with oil pipe nitrogen vehicle, pumping rod nitrogen vehicle, upper oil pipe inner cavity and hollow pumping rod inner cavity respectively, hollow pumping rod is inserted into cavity of upper oil pipe, oil jacket annulus is formed between hollow pumping rod and upper oil pipe, oil jacket annulus is connected with pressure relief solenoid valve through hose, expansion type packer in communication with hollow pumping rod is fixedly arranged on hollow pumping rod, tail rod lower end of hollow pumping rod is connected with telescopic rod but not communicated, tail rod lower end of telescopic rod is sleeved with claw spring, tail pipe terminal of lower oil pipe is provided with dead plug, the plugging removal energy of the present application is large, the plugging removal radius is large, and the plugging removal to downhole is effectively realized.

Description

Technical Field

[0001] This invention belongs to the field of oil production technology, specifically relating to a mechanical gas well blowout jet unblocking device. Background Technology

[0002] Conventional physical methods for unclogging gas wells include ultrasonic unclogging technology, high-pressure water jet unclogging, plasma pulse unclogging, oscillating cavitation unclogging, liquid flow cavitation unclogging, strong negative pressure unclogging technology, and hydraulic / pressure pulse unclogging. However, existing unclogging methods have disadvantages such as low unclogging energy and small unclogging radius.

[0003] "Air cannon" unblocking is a technology widely used in the coal and cement industries. It has the advantages of strong explosive force, controllability, and low cost, and it is very effective in clearing blockages. Summary of the Invention

[0004] To address the aforementioned problems, this invention proposes a mechanical gas well blowout jet unblocking device, comprising a tubing nitrogen truck, a sucker rod nitrogen truck, a four-way connector, a hose, a hollow sucker rod, tubing, a nozzle, an expansion packer, a claw spring, a telescopic rod, a plug, a pressure relief solenoid valve, and a blowout vent. The tubing includes an upper tubing and a lower tubing, the upper tubing being connected to the lower tubing via a nozzle. The four-way connector has four passages respectively connected to the tubing nitrogen truck, the sucker rod nitrogen truck, the inner cavity of the upper tubing, and the inner cavity of the hollow sucker rod. The gas truck is connected to the inner cavity of the hollow sucker rod via a hose, and the oil pipe nitrogen truck is connected to the inner cavity of the upper oil pipe via a hose. The hollow sucker rod is inserted into the cavity of the upper oil pipe, forming an annulus between the hollow sucker rod and the upper oil pipe. The annulus is connected to the pressure relief solenoid valve via a hose, and the pressure relief solenoid valve is connected to the venting channel via a hose. An expansion packer connected to the hollow sucker rod is fixedly installed on the hollow sucker rod. The lower end of the tail rod of the hollow sucker rod is connected to the telescopic rod but not connected. The lower end of the tail rod of the telescopic rod is fitted with a claw spring, and the tail end of the lower oil pipe is equipped with a dead plug.

[0005] Furthermore, the venting groove is provided with a communicating vent hole.

[0006] Furthermore, a one-way nozzle orifice is provided on the side wall of the nozzle, which connects the inner cavity of the oil pipe with the annulus of the oil sleeve. The one-way nozzle orifice includes a spring and a valve ball, with the spring connected to the valve ball and the valve ball movably connected to an opening on the side wall of the oil pipe.

[0007] Furthermore, the expansion packer is kept in the same position as the inside of the nozzle by adjusting the telescopic rod.

[0008] Furthermore, the expandable packer includes a rubber sleeve. The expandable packer uses high-pressure gas in its internal cavity to expand the rubber sleeve and set the nozzle. When the pressure inside the hollow sucker rod cavity decreases, the rubber sleeve contracts, releasing the nozzle seal.

[0009] Furthermore, a positioning pin for limiting the claw spring is fixedly provided on the inner wall of the oil pipe.

[0010] Furthermore, the telescopic rod is connected to the lower end of the hollow sucker rod tail rod, and the telescopic rod cavity is not connected to the hollow sucker rod cavity.

[0011] Furthermore, the sealing pressure of the hollow sucker rod with an internal sealing structure is above 12 MPa.

[0012] The beneficial effects of this invention are as follows: Based on the airflow explosion principle of an air cannon, this patent innovatively applies this technology to the field of petroleum engineering. Addressing the problem of gas well blockage, it designs a mechanical jet deblocking process string. This string only requires adjusting the pressure of the surface nitrogen truck and the opening and closing of the pressure relief valve to achieve high-energy deblocking of the designed gas-producing layer downhole. This string has the following advantages:

[0013] 1. It has a large unblocking energy; when the inflation pressure is 10MPa, the detonation pressure can reach 8MPa.

[0014] 2. It has a large unblocking radius, with an effective working radius of over 15m. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 This is a schematic diagram of the claw spring structure of the present invention;

[0017] Figure 3 This is a schematic diagram of the structure of the jet deblocking device of the present invention;

[0018] The attached figures are labeled as follows:

[0019] 1. Oil pipe nitrogen truck, 2. Sucker rod nitrogen truck, 3. Four-way connector, 4. Hoses, 5. Hollow sucker rod, 6. Oil pipe, 61. Upper oil pipe, 62. Lower oil pipe, 63. Opening, 7. Nozzle, 71. One-way nozzle, 72. Spring, 73. Valve ball, 8. Expansion packer, 9. Claw spring, 91. Positioning pin, 10. Telescopic rod, 11. Dead plug, 12. Pressure relief solenoid valve, 13. Vent hole, 14. Vent trough, 15. Hook. Detailed Implementation

[0020] A mechanical gas well blowout jet unblocking device, characterized in that it includes a tubing nitrogen trolley 1, a sucker rod nitrogen trolley 2, a four-way connector 3, a hose 4, a hollow sucker rod 5, tubing 6, a nozzle 7, an expansion packer 8, a claw spring 9, a telescopic rod 10, a dead plug 11, a pressure relief solenoid valve 12, and a blowout vent 14. The tubing 6 includes an upper tubing 61 and a lower tubing 62. The upper tubing 61 is connected to the lower tubing 62 via the nozzle 7. The four passages of the four-way connector 3 are respectively connected to the tubing nitrogen trolley 1, the sucker rod nitrogen trolley 2, the inner cavity of the upper tubing 61, and the inner cavity of the hollow sucker rod 5. The sucker rod nitrogen trolley 2 is connected to the hose 4. Pipe 4 is connected to the inner cavity of hollow sucker rod 5. Oil pipe nitrogen truck 1 is connected to the inner cavity of upper oil pipe 61 through hose 4. Hollow sucker rod 5 is inserted into the cavity of upper oil pipe 61. An oil sleeve annulus is formed between hollow sucker rod 5 and upper oil pipe 61. The oil sleeve annulus is connected to pressure relief solenoid valve 12 through hose 4. Pressure relief solenoid valve 12 is connected to venting groove 14 through hose 4. An expansion packer 8 is fixedly installed on hollow sucker rod 5 and communicates with hollow sucker rod 5. The lower end of the tail rod of hollow sucker rod 5 is connected to telescopic rod 10 but not connected. The lower end of the tail rod of telescopic rod 10 is sleeved with claw spring 9. The tail end of lower oil pipe 62 is provided with dead plug 11.

[0021] The venting groove 14 is provided with a communicating venting hole 13.

[0022] The nozzle 7 has a one-way nozzle port 71 on its side wall. The one-way nozzle port 71 connects the inner cavity of the oil pipe 6 with the annulus of the oil sleeve. The one-way nozzle port 71 includes a spring 72 and a valve ball 73. The spring 72 is connected to the valve ball 73, and the valve ball 73 is movably connected to the opening 63 on the side wall of the oil pipe 6.

[0023] The expansion packer 8 and the inside of the nozzle 7 are kept in the same position by adjusting the telescopic rod 10.

[0024] The expandable packer 8 includes a rubber sleeve. The expandable packer 8 uses high-pressure gas in its inner cavity to expand the rubber sleeve and set the nozzle 7. When the pressure inside the hollow sucker rod 5 decreases, the rubber sleeve contracts and releases the seal of the nozzle 7.

[0025] The inner wall of the oil pipe 6 is fixedly provided with a positioning pin 91 that limits the claw spring 9.

[0026] The telescopic rod 10 is connected to the lower end of the tail rod of the hollow sucker rod 5, and the cavity of the telescopic rod 10 is not connected to the cavity of the hollow sucker rod 5.

[0027] Among them, the sealing pressure of the hollow sucker rod 5 with internal sealing structure is above 12MPa.

[0028] The one-way nozzle orifice 71 connects the tubing inner cavity to the tubing annulus. The inner side of the nozzle mates with an expanding packer to seal the nozzle orifice. A dead plug is connected to the lowest end of the tubing string to seal the lower end of the tubing. The nozzle orifice has a one-way opening function, such as... Figure 3 As shown, this ensures that, under unpressurized conditions, annular well fluid cannot enter the tubing through the nozzle.

[0029] The positioning pin 91 is connected to the oil pipe 6, which can limit the upward movement of the claw spring 9 at the lower end of the telescopic rod 10. When the tension exceeds the limit, the positioning pin 91 can be broken. At this time, the limiting function fails, and the telescopic rod 10 can move upward freely.

[0030] The telescopic rod 10 has a telescopic function and is connected to the lower end of the tail rod of the hollow sucker rod 5. The cavity of the telescopic rod 10 is not connected to the cavity of the hollow sucker rod 5. The end of the telescopic rod 10 has a claw spring 9 structure, which allows downward movement through the positioning pin 91, but upward movement is restricted by the positioning pin 91. Figure 2 As shown, when the claw spring 9 is lowered, its lower end is compressed and contracts, passing through the positioning pin 91. When it is lifted, the right angle of the claw spring 9 locks the positioning pin 91 to achieve positioning. Increasing the lifting force to reach the breaking force of the positioning pin 91 breaks the positioning pin 91, allowing the tubing to be lifted out.

[0031] The rubber sleeve is part of the expandable packer 8. The expandable packer 8 uses high-pressure gas in its internal cavity to expand the rubber sleeve, achieving a setting seal. The expandable packer 8 is connected to the hollow sucker rod 5 and inserted into the tubing 6. It achieves setting seal by supplying gas through the hollow sucker rod 5. It is not connected to the tubing 6. The internal cavity of the expandable packer 8 communicates with the cavity of the hollow sucker rod 5. When the pressure inside the cavity of the hollow sucker rod 5 increases, the rubber sleeve expands, sealing the one-way nozzle orifice 71, achieving a sealing function. When the pressure inside the cavity of the hollow sucker rod 5 decreases, the rubber sleeve contracts, releasing the seal of the one-way nozzle orifice 71.

[0032] Hollow sucker rod 5 is a conventional and mature product. It has an internal sealing structure and can seal gas pressure exceeding 12MPa. The hollow sucker rod 5 string is connected to the telescopic rod 10 so that the inner cavity of the hollow sucker rod 5 string remains sealed after it is lowered into the well.

[0033] The four-way connector 3 is connected to the two nitrogen trucks, ensuring that the oil pipe nitrogen truck 1 is connected to the oil pipe 6 through the four-way connector, and the sucker rod nitrogen truck 2 is connected to the inner cavity of the hollow sucker rod 5.

[0034] Construction process: 1. First, lower the tubing 6, nozzle 7, and positioning pin 91 into the gas well. The nozzle 7 and positioning pin 91 are lowered to the designed depth so that the nozzle is at the target unblocking gas layer depth.

[0035] 2. Then, lower the following components: hollow sucker rod 5, expandable packer 8, and telescopic rod 10. Lower the telescopic rod 10 below the depth of the locating pin 91. At this point, the claw spring 9 of the telescopic rod 10 passes through the locating pin 91. Then, lift the hollow sucker rod 5. When the claw spring 9 of the telescopic rod 10 touches the locating pin 91, the movement of the telescopic rod 10 is restricted, and the telescopic rod 10 is extended to its longest position. Figure 3 As shown, at this time, the expandable packer 8 and the one-way nozzle orifice 71 are at the same depth. After the expandable packer 8 expands, it can seal the one-way nozzle orifice 71.

[0036] 3. Connect the ground pipelines: oil pipe 6, hollow sucker rod 5, and sucker rod nitrogen truck 2. Sucker rod nitrogen truck 2 is connected to the inner cavity of hollow sucker rod 5 via hose 4. Oil pipe nitrogen truck 1 is connected to the inner cavity of upper oil pipe 61 via hose 4. Hollow sucker rod 5 is inserted into the cavity of upper oil pipe 61, forming an annulus between hollow sucker rod 5 and upper oil pipe 61. The annulus is connected to pressure relief solenoid valve 12 via hose 4. Pressure relief solenoid valve 12 is connected to venting channel 14 via hose 4.

[0037] 4. During the unblocking process, first close the pressure relief solenoid valve 12, then open the sucker rod nitrogen trolley 2. At this time, the pressure inside the hollow sucker rod 5 increases, and the expansion packer 8 expands, sealing the nozzle orifice. After pressurization, close the sucker rod nitrogen trolley 2. Open the tubing nitrogen trolley 1, and gas enters the downhole tubing cavity above the packer through the wellhead. The pressure inside the tubing begins to increase. When the pressure reaches the design pressure, close the tubing nitrogen trolley and the tubing valves, maintaining the tubing and sucker rod in a pressurized state.

[0038] 5. Quickly open the pressure relief valve. At this time, the gas in the inner cavity of the hollow sucker rod is released into the atmosphere through the pressure relief valve and the blowout channel. The expansion packer contracts under the pressure difference between the tubing and the sucker rod, and the packing effect fails. The nozzle orifice channel opens, and the high-pressure gas in the tubing is quickly released into the unblocked formation through the nozzle orifice, forming a high-speed explosive gas flow, which realizes the physical unblocking of the unblocked section.

[0039] 6. Repeating steps 4 and 5 can achieve multiple unblocking operations on the same layer. Depressurize and remove the four-way connector, lift and disassemble the oil pipe and sucker rod to the unblocking layer, reinstall the tubing structure, and repeat steps 4 and 5 to achieve unblocking operations on the upper unblocking layer.

[0040] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A mechanical gas well blowout jet unblocking device, characterized in that, The system includes a tubing nitrogen trolley (1), a sucker rod nitrogen trolley (2), a four-way connector (3), a hose (4), a hollow sucker rod (5), tubing (6), a nozzle (7), an expansion packer (8), a claw spring (9), a telescopic rod (10), a dead plug (11), a pressure relief solenoid valve (12), and a blowout trough (14). The tubing (6) includes an upper tubing (61) and a lower tubing (62). The upper tubing (61) is connected to the lower tubing (62) through the nozzle (7). The four-way connector (3) has four passages that are respectively connected to the tubing nitrogen trolley (1), the sucker rod nitrogen trolley (2), the inner cavity of the upper tubing (61), and the inner cavity of the hollow sucker rod (5). The sucker rod nitrogen trolley (2) is connected to the hollow sucker rod through the hose (4). The inner cavity of the rod (5) is connected, and the oil pipe nitrogen truck (1) is connected to the inner cavity of the upper oil pipe (61) through the hose (4). The hollow sucker rod (5) is inserted into the cavity of the upper oil pipe (61). An oil sleeve annulus is formed between the hollow sucker rod (5) and the upper oil pipe (61). The oil sleeve annulus is connected to the pressure relief solenoid valve (12) through the hose (4). The pressure relief solenoid valve (12) is connected to the blowout trough (14) through the hose (4). An expansion packer (8) connected to the hollow sucker rod (5) is fixedly installed on the hollow sucker rod (5). The lower end of the tail rod of the hollow sucker rod (5) is connected to the telescopic rod (10) but not connected. The lower end of the tail rod of the telescopic rod (10) is sleeved with a claw spring (9). The tail end of the lower oil pipe (62) is provided with a dead plug (11).

2. The mechanical gas well blowout jet unblocking device according to claim 1, characterized in that, The venting groove (14) is provided with a connected venting hole (13).

3. The mechanical gas well blowout jet unblocking device according to claim 1, characterized in that, The nozzle (7) has a one-way nozzle port (71) on its side wall. The one-way nozzle port (71) connects the inner cavity of the oil pipe (6) with the annulus of the oil sleeve. The one-way nozzle port (71) includes a spring (72) and a valve ball (73). The spring (72) is connected to the valve ball (73), and the valve ball (73) is movably connected to the opening (63) on the side wall of the oil pipe (6).

4. The mechanical gas well blowout jet unblocking device according to claim 3, characterized in that, The expansion packer (8) and the inside of the nozzle (7) are kept in the same position by adjusting the telescopic rod (10).

5. The mechanical gas well blowout jet unblocking device according to claim 4, characterized in that, The expansion packer (8) includes a rubber sleeve. The expansion packer (8) uses high-pressure gas in its inner cavity to expand the rubber sleeve and set the nozzle (7). When the pressure inside the hollow sucker rod (5) decreases, the rubber sleeve contracts and releases the seal of the nozzle (7).

6. The mechanical gas well blowout jet unblocking device according to claim 1, characterized in that, The inner wall of the oil pipe (6) is fixedly provided with a positioning pin (91) for limiting the claw spring (9).

7. The mechanical gas well blowout jet unblocking device according to claim 1, characterized in that, The telescopic rod (10) is connected to the lower end of the tail rod of the hollow sucker rod (5), and the cavity of the telescopic rod (10) is not connected to the cavity of the hollow sucker rod (5).

8. The mechanical gas well blowout jet unblocking device according to claim 1, characterized in that, The hollow sucker rod (5) with an internal sealing structure has a sealing pressure of 12 MPa or higher.

Images