Offshore gas well immovable string drainage and yield increase device and method thereof

Abstract

The embodiment of the invention discloses an offshore gas well immovable string drainage and yield increase device and method. The offshore gas well immovable string drainage and yield increase device comprises a first anchoring device, filler, a second anchoring device, a blowout prevention string and a traction component. The blowout prevention pipe column is arranged at a wellhead of an offshore gas well, and a gate is arranged on the upper portion of the blowout prevention pipe column. A damping device and a connecting part are arranged above the first anchoring device; the lower portion of the first anchoring device is connected with a soluble plugging piece, the first anchoring device is used for clamping and fixing the soluble plugging piece to the preset position of the oil pipe so that the soluble plugging piece can plug the oil pipe, and after the oil pipe is filled with the filler and the blowout prevention pipe column is detached, the soluble plugging piece is dissolved. The filler is put into the oil pipe, so that the cross sectional area of a gas production channel in the oil pipe is reduced, underground gas can still be discharged with accumulated liquid when the yield of an offshore gas well is low, normal production is guaranteed, the construction difficulty is small, and the operation cost is low.

Description

Technical Field

[0001] The present invention relates to the field of offshore gas well production equipment, and in particular to an offshore gas well fixed pipe column drainage and production increasing device and a method thereof. Background Art

[0002] In the later stage of gas well production, due to the decrease in formation pressure, the decline in gas well production capacity, and the increase in wellbore temperature gradient, some components of natural gas condense in the wellbore to form condensate. When the gas production of the gas well is not enough to carry out this part of the condensate, the condensate falls back to the bottom of the well, resulting in wellbore liquid accumulation. In the early stage of liquid accumulation in pure gas wells, when the formation pressure is relatively high, the gas well can use its own energy to carry out the liquid accumulation after the liquid accumulation reaches a certain level. When the flow rate of gas in the wellbore is lower than the critical flow rate, the gas cannot carry the water produced by the formation to the ground, resulting in the formation of liquid accumulation at the bottom of the well. Liquid accumulation will produce a certain back pressure on the gas reservoir, resulting in a decrease in gas production, and ultimately causing the gas well to have to produce intermittently or even be abandoned. The conventional onshore methods of discharging liquid from gas wells mainly include beam pumping, piston gas lift, small oil pipes, flow regulators, and soap injection. However, the above methods are difficult to construct on offshore gas wells and have high operating costs. Summary of the invention

[0003] A series of simplified concepts are introduced in the Summary of the Invention, which will be further described in detail in the Detailed Description of the Invention. The Summary of the Invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0004] In a first aspect, an embodiment of the present invention provides an offshore gas well fixed pipe string drainage and production enhancement device, including a first anchoring device, a filler, a second anchoring device, a blowout preventer pipe string, and a traction component;

[0005] The blowout preventer string is arranged at the wellhead of an offshore gas well, and a gate is arranged at the upper part of the blowout preventer string, and the gate is used to complete the operation of releasing filler into the oil pipe of the wellbore to reduce the cross-sectional area of ​​the gas production channel in the oil pipe;

[0006] A vent hole is provided in the middle of the first anchoring device to allow gas and liquid to circulate; a connecting component is provided above the first anchoring device, and the connecting component is used to be detachably connected to the traction component so as to deliver the first anchoring device into the oil pipe through the traction component;

[0007] A soluble plugging piece is connected to the lower part of the first anchoring device, and the first anchoring device is used to fix the soluble plugging piece at a preset position of the oil pipe so as to use the soluble plugging piece to plug the production channel, and after the oil pipe is filled with the filler and the blowout preventer string is disassembled, the soluble plugging piece dissolves;

[0008] A vent hole is provided in the middle of the second anchoring device to allow gas and liquid to circulate; the second anchoring device is used to be fixed to the top of the filler in the oil pipe after the filler has completely filled the oil pipe, so as to limit the movement of the filler.

[0009] Optionally, the filler is a plurality of small balls, each of which has a density of 1 g / cm 3 .

[0010] Optionally, a damping and shock absorbing device is further provided between the connecting component and the first anchoring device.

[0011] Optionally, the falling speed v of the ball in the wellbore is:

[0012]

[0013] Among them, ρ b is the density of the ball; ρ g is the gas density; D is the diameter of the ball; g is the gravitational acceleration;

[0014] The impact force F of a single ball on the first anchoring device is:

[0015]

[0016] Where M is the mass of the ball, v is the ball speed, and t is the rebound time;

[0017] The impact force of the small ball should be less than the maximum load of the damping shock absorbing device.

[0018] Optionally, the porosity of the wellbore after the accumulation of the small balls is 25% to 35%, and the equivalent diameter of the wellbore is reduced to 25% to 35% of the original diameter; after filling with the small balls, the critical production Qc of natural gas is:

[0019]

[0020] Where A is the cross-sectional area of ​​the wellbore; z is the compressibility factor; T is the temperature; p is the pressure; v t is the air flow velocity and η is the stacking coefficient.

[0021] Optionally, a blowout preventer is further provided on the blowout preventer column, and the blowout preventer is located below the gate.

[0022] Optionally, one end of the oil pipe is connected to the blowout preventer string, and the other end of the oil pipe is connected to the screen pipe.

[0023] Optionally, the blowout preventer is a sailboard-type blowout preventer, and the gate is a blowout preventer gate.

[0024] In a second aspect, an embodiment of the present invention provides a method for increasing production by draining water from an immovable pipe string of an offshore gas well, which is applied to the above-mentioned device for increasing production by draining water from an immovable pipe string of an offshore gas well, comprising:

[0025] Install the blowout preventer string at the wellhead; connect the connecting component to the traction component, and place the connecting component, the first anchoring device and the soluble plugging component into the oil pipe of the wellbore through the traction component;

[0026] When the soluble plugging member reaches the preset position, the first anchoring device is fixed to the peripheral wall of the oil pipe to fix the soluble plugging member at the preset position, and the production channel is blocked by the soluble sealing member;

[0027] Disassemble the traction component from the connection component and remove it from the oil pipe;

[0028] Open the gate on the blowout preventer string and put the filler into the oil pipe to reduce the cross-sectional area of ​​the gas production channel in the oil pipe;

[0029] After the filling is completed, the second anchoring device is placed into the oil pipe by using the traction component and fixed at the top of the filling to restrict the movement of the filling;

[0030] Disassembling the traction member from the second anchoring device and taking it out of the oil pipe;

[0031] The blowout preventer string is removed from the wellhead, and the soluble plug is dissolved so that the gas and liquid can be discharged through the gas production channel in the oil pipe.

[0032] According to an embodiment of the present invention, a device and method for increasing production of an offshore gas well with a fixed pipe column is provided. Fillers are placed in the oil pipe to reduce the cross-sectional area of ​​the gas production channel in the oil pipe, so that when the offshore gas well is at low production, the underground gas can still be discharged with accumulated liquid, thereby ensuring normal production. In addition, the liquid-discharging and gas-production device has a simple structure, is easy to operate, has low construction difficulty, and has low operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The following drawings of the present invention are used as part of the embodiments of the present invention for understanding the present invention. The embodiments of the present invention are shown in the drawings and the description thereof is used to explain the principle of the present invention.

[0034] In the attached figure:

[0035] Figure 1 It is a structural diagram of an offshore gas well fixed pipe string water drainage and production enhancement device according to an optional embodiment of the present invention;

[0036] Figure 2 for Figure 1 A partial enlarged view of

[0037] Figure 3 The present invention is a flow chart of a method for increasing production by draining water from an immobile pipe string of an offshore gas well according to an optional embodiment of the present invention.

[0038] Description of reference numerals:

[0039] 1-traction component, 2-blowout preventer string, 3-gas well, 4-blowout preventer, 5-packer, 6-filler, 7-oil pipe, 8-connecting component, 9-first anchoring device, 10-soluble plugging component, 11-screen pipe, 12-reservoir, 13-damping shock absorbing device, 14-second anchoring device. DETAILED DESCRIPTION

[0040] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is apparent to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0041] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, integral bodies, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integral bodies, steps, operations, elements, components and / or combinations thereof.

[0042] Now, exemplary embodiments according to the present invention will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in a variety of different forms and should not be interpreted as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided to make the disclosure of the present invention thorough and complete, and to fully convey the concept of these exemplary embodiments to those of ordinary skill in the art.

[0043] First, as Figure 1 and Figure 2As shown, an embodiment of the present invention provides an offshore gas well fixed pipe string drainage and production enhancement device, comprising a first anchoring device 9, a second anchoring device 14, a filler 6, a blowout preventer pipe string 2 and a traction component 1; the blowout preventer pipe string 2 is arranged at the wellhead of the offshore gas well 3, and a gate is arranged on the upper part of the blowout preventer pipe string 2, and the gate is used to complete the operation of releasing the filler 6 into the oil pipe of the wellbore to reduce the cross-sectional area of ​​the gas production channel in the oil pipe; a vent is arranged in the middle part of the first anchoring device 9 to allow gas and liquid to circulate; a connecting component 8 is arranged above the first anchoring device 9, and the connecting component 8 is used to be detachably connected to the traction component 1 so as to pass The traction component 1 delivers the first anchoring device 9 into the oil pipe; the lower part of the first anchoring device 9 is connected with a soluble sealing member 10, and the first anchoring device 9 is used to fix the soluble sealing member 10 at a preset position of the oil pipe so as to use the soluble sealing member 10 to seal the oil pipe, and after the filler 6 has filled the oil pipe and the blowout preventer column 2 has been disassembled, the soluble sealing member 10 is dissolved; a vent is provided in the middle part of the second anchoring device 14 to allow gas and liquid to circulate; the second anchoring device 14 is used to be fixed to the top of the filler 6 in the oil pipe after the filler 6 has filled the oil pipe so as to limit the movement of the filler 6.

[0044] Among them, the connecting component 8 can adopt an existing connection structure, such as a clamping piece, etc. The detachable connection between the connecting component 8 and the traction component 1 can also adopt an existing detachable connection method such as a clamping connection. The specific structure of the connecting component 8 is not strictly limited in this embodiment. The clamping principle of the first anchoring device 9 and the second anchoring device 14 can be the same as the clamping principle of the existing downhole anchoring device, which will not be repeated here. The traction component 1 can be a cable, and of course other traction components 1 can also be used. The preset position can be set by the staff, generally at the lower part of the oil pipe.

[0045] The soluble plug is made of soluble material, generally a high-molecular soluble material, that is, it can block the oil pipe within a certain period of time (the duration is controllable), and after a certain period of time, it can be completely dissolved in water or dissolved by adding a corresponding solvent.

[0046] Under normal production conditions, a packer 5 can be placed in the offshore gas well 3 to limit and isolate the oil pipe. The oil pipe is set in the packer 5, and the bottom of the oil pipe reaches the reservoir 12. When the offshore gas well has a low production, a blowout preventer string 2 is installed at the wellhead of the offshore gas well, and a gate is installed on the blowout preventer string 2; then the connecting component 8 is connected to the traction component 1, and the connecting component 8, the first anchoring device 9 and the soluble sealing component 10 are placed in the oil pipe through the traction component 1; then when the soluble sealing component 10 reaches the preset position, the first anchoring device 9 is clamped with the surrounding wall of the oil pipe to fix the soluble sealing component 10 in the preset position, and the oil pipe is sealed by the soluble sealing component; the traction component 1 is removed from the connecting component 8 and taken out of the oil pipe; Open the gate on the blowout preventer string 2 and drop the filler 6 into the oil pipe to reduce the cross-sectional area of ​​the gas production channel in the oil pipe; after the filling is completed, use the traction component 1 to put the second anchoring device 14 into the oil pipe and fix it at the top of the filling to limit the movement of the filler 6; then remove the traction component 1 from the second anchoring device 14 and take it out of the oil pipe; finally, remove the blowout preventer string 2 from the oil pipe, and dissolve the soluble plug, so that after normal production, the gas-carrying liquid can enter the oil pipe and be discharged through the gaps between the fillers 6.

[0047] In a traditional vertical well, the critical production of natural gas, Qc, is;

[0048]

[0049] Where A is the cross-sectional area of ​​the wellbore; z is the compressibility factor; T is the temperature; p is the pressure; v t is the air flow velocity.

[0050] When the natural gas production is less than the critical production Qc, the gas will not be able to carry out the accumulated liquid in the well, resulting in a decrease in the wellbore liquid production and failure of normal production.

[0051] In the present application, by injecting the filling material 6 (small balls), the cross-sectional area of ​​the wellbore is reduced, and the critical production of the gas well is reduced, so that the gas well can still produce normally at a lower production.

[0052] Specifically, the stacking mode of the small balls is random stacking, including face-centered stacking, hexagonal stacking and cubic-centered stacking. It is estimated that the void ratio of the wellbore after the small balls are stacked is 25% to 35%, and the equivalent diameter of the wellbore is reduced to 25% to 35% of the original diameter. Its critical production can be greatly reduced. Assuming its stacking coefficient is η, the critical production of natural gas after filling with small balls, Qc, is:

[0053]

[0054] Where A is the cross-sectional area of ​​the wellbore; z is the compressibility factor; T is the temperature; p is the pressure; v t is the air flow velocity and η is the stacking coefficient.

[0055] Therefore, according to an embodiment of the present invention, a drainage and production-increasing device for an offshore gas well with a fixed tubing string is provided. By putting a filler 6 into the oil pipe to reduce the cross-sectional area of ​​the gas production channel in the oil pipe, the offshore gas well 3 can still discharge the underground gas carrying the accumulated liquid when the production is low, thereby ensuring normal production. In addition, the drainage and gas production device has a simple structure, is easy to operate, has low construction difficulty and low operating cost.

[0056] Furthermore, the filler 6 is a plurality of small balls.

[0057] The small balls are in point contact with each other, thereby preventing the filler 6 from blocking the delivery channel in the oil pipe.

[0058] Furthermore, if Figure 2 As shown, a damping and shock absorbing device 13 is further provided between the connecting component 8 and the first anchoring device 9 .

[0059] The damping shock absorbing device 13 can buffer the impact force of the falling filler 6 (ie, small balls with a density of 1 g / cm3), thereby reducing the impact force on the first anchoring device 9, thereby preventing the first anchoring device 9 from falling off due to the impact.

[0060] Specifically, the impact velocity v generated by the ball falling in the wellbore is:

[0061]

[0062] Among them, ρ b is the ball density, take 1000kg / m 3 ρ g is the gas density, standard is 1.29kg / m 3 ; D is the diameter of the ball; g is the acceleration due to gravity.

[0063] It can be seen that the maximum speed of the ball in the wellbore and the ball diameter are related to the gravitational acceleration g. It is assumed that the gravitational acceleration g is a constant. The larger the diameter of the ball, the greater the impact speed and the greater the impact energy.

[0064] The impact force of a single ball on the first anchoring device 9 is F; Wherein M is the ball mass, v is the ball speed, and t is the rebound time. Therefore, in a specific application, the impact force of the ball should be less than the maximum load of the damping and shock absorbing device 13.

[0065] Furthermore, a blowout preventer 4 is provided on the blowout preventer pipe column 2. The blowout preventer 4 is located below the gate. The blowout preventer 4 can prevent blowout accidents from occurring, thereby improving safety.

[0066] Furthermore, the top end of the oil pipe 7 is communicated with the bottom end of the blowout preventer string 2, and the top end of the oil pipe 7 is communicated with the bottom end of the screen pipe.

[0067] The first anchoring device 9 can be fixed on the screen tube. The diameter of the upper part of the oil pipe 7 is greater than the diameter of the lower part of the oil pipe 7, which can reduce the amount reaching the lower part of the oil pipe 7, thereby reducing the impact force of the filler 6.

[0068] Furthermore, the blowout preventer 4 is a sailboard-type blowout preventer, and the gate is a blowout preventer gate.

[0069] The sailboard type blowout preventer has the advantages of good sealing performance, strong reliability, reasonable structure, convenient operation and installation, strong on-site practicality, etc. The blowout preventer can make the device safer during use.

[0070] Second, as Figure 3 As shown, an embodiment of the present invention provides a method for increasing production by draining water from an immovable pipe string of an offshore gas well, which is applied to the above-mentioned device for increasing production by draining water from an immovable pipe string of an offshore gas well, comprising:

[0071] Step S101 : installing a blowout preventer string 1 at the wellhead of an offshore gas well 3 , and installing a blowout preventer gate on the blowout preventer string 1 .

[0072] Step S102: Connect the connecting component 8 to the traction component 1, and place the connecting component 8, the first anchoring device 9 and the soluble plugging member 10 into the oil pipe of the wellbore through the traction component 1.

[0073] Step S103: When the soluble plugging member 10 reaches the preset position, the first anchoring device 9 is fixed to the peripheral wall of the oil pipe to fix the soluble plugging member 10 at the preset position, and the oil pipe is sealed by the soluble sealing member.

[0074] Step S104: Remove the traction component 1 from the connecting component 8 and take it out from the oil pipe.

[0075] Step S105: Open the gate on the blowout preventer string 2 and put the filler 6 into the oil pipe to reduce the cross-sectional area of ​​the gas production channel in the oil pipe.

[0076] Specifically, after taking out the traction component 1 (i.e., the cable), a filler having a density of 1 g / cm 3 The small balls are accumulated at the bottom of the well by free fall. Among them, the first anchoring device 9 is provided with a damping and shock absorbing device 13 to prevent the impact of the falling speed of the small balls, thereby reducing the impact force on the first anchoring device 9, thereby preventing the first anchoring device 9 from falling off due to the impact.

[0077] Specifically, the impact velocity of the ball falling in the wellbore is:

[0078]

[0079] Among them, ρ b is the ball density, take 1000kg / m 3 ρ g is the gas density, standard is 1.29kg / m 3 ; D is the diameter of the ball; g is the acceleration due to gravity.

[0080] It can be seen that the maximum speed of the ball in the wellbore and the ball diameter are related to the gravitational acceleration g. It is assumed that the gravitational acceleration g is a constant. The larger the diameter of the ball, the greater the impact speed and the greater the impact energy.

[0081] The impact force of a single ball on the first anchoring device 9 is F; Wherein M is the ball mass, v is the ball speed, and t is the rebound time. Therefore, in a specific application, the impact force of the ball should be less than the maximum load of the damping and shock absorbing device 13.

[0082] Step S106: After the filling is completed, the second anchoring device 14 is placed into the oil pipe using the traction component 1 and fixed at the top of the filling to limit the movement of the filling material 6.

[0083] Step S107: Remove the traction component 1 from the second anchoring device 14 and take it out from the oil pipe.

[0084] Step S108: Remove the blowout preventer string 2 from the wellhead, and dissolve the soluble plugger so that the gas and liquid can be discharged through the gas production channel in the oil pipe.

[0085] In a traditional vertical well, the critical production of natural gas, Qc, is;

[0086]

[0087] Where: A is the cross-sectional area of ​​the wellbore; z is the compression factor; T is the temperature; p is the pressure; v t is the air flow velocity.

[0088] When the natural gas production is less than the critical production Qc, the gas will not be able to carry out the accumulated liquid in the well, resulting in a decrease in the wellbore liquid production and failure of normal production.

[0089] In the present application, by injecting the filling material 6 (small balls), the cross-sectional area of ​​the wellbore is reduced, and the critical production of the gas well is reduced, so that the gas well can still produce normally at a lower production.

[0090] Specifically, the stacking mode of the small balls is random stacking, including face-centered stacking, hexagonal stacking and cubic-centered stacking. It is estimated that the void ratio of the wellbore after the small balls are stacked is 25% to 35%, and the equivalent diameter of the wellbore is reduced to 25% to 35% of the original diameter. Its critical production can be greatly reduced. Assuming its stacking coefficient is η, the critical production of natural gas after filling with small balls, Qc, is:

[0091]

[0092] Where A is the cross-sectional area of ​​the wellbore; z is the compressibility factor; T is the temperature; p is the pressure; v t is the air flow velocity and η is the stacking coefficient.

[0093] Therefore, according to an embodiment of the present invention, a method for increasing production by draining water from a fixed pipe column in an offshore gas well is provided. By placing a filler 6 into the oil pipe to reduce the cross-sectional area of ​​the gas production channel in the oil pipe, the offshore gas well 3 can still be discharged with the accumulated liquid when the production is low, thereby ensuring normal production. In addition, the drainage and gas production device has a simple structure, is easy to operate, has low construction difficulty, and has low operating costs.

[0094] The present invention has been described by the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and description, and are not intended to limit the present invention to the scope of the described embodiments. In addition, it can be understood by those skilled in the art that the present invention is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of the present invention, and these variations and modifications all fall within the scope of the protection claimed by the present invention. The protection scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A device for increasing production by draining water from an immovable pipe column of an offshore gas well, characterized in that: It includes a first anchoring device, a filler, a second anchoring device blowout preventer string and a traction component; The blowout preventer string is arranged at the wellhead of an offshore gas well, and a gate is arranged at the upper part of the blowout preventer string, and the gate is used to complete the operation of releasing filler into the oil pipe of the wellbore to reduce the cross-sectional area of ​​the gas production channel in the oil pipe; A vent hole is provided in the middle of the first anchoring device to allow gas and liquid to circulate; a connecting component is provided above the first anchoring device, and the connecting component is used to be detachably connected to the traction component so as to deliver the first anchoring device to the bottom of the oil pipe through the traction component; A soluble plugging piece is connected to the lower part of the first anchoring device, and the first anchoring device is used to fix the soluble plugging piece at a preset position of the oil pipe so as to plug the oil pipe with the soluble plugging piece, and after the oil pipe is filled with the filler and the blowout preventer string is disassembled, the soluble plugging piece dissolves; A vent hole is provided in the middle of the second anchoring device to allow gas and liquid to circulate; the second anchoring device is used to be fixed to the top of the filler in the oil pipe after the filler has completely filled the oil pipe, so as to limit the movement of the filler.

2. The offshore gas well fixed pipe column drainage and production enhancement device according to claim 1 is characterized in that: The filler is a plurality of small balls, each of which has a density of 1 g / cm 3 .

3. The offshore gas well fixed pipe column drainage and production enhancement device according to claim 2 is characterized in that: A damping and shock absorbing device is also provided between the connecting component and the first anchoring device.

4. The offshore gas well fixed pipe string drainage and production enhancement device according to claim 3 is characterized in that: The falling speed v of the ball in the wellbore is: Among them, ρ b is the density of the ball; ρ g is the gas density; D is the diameter of the ball; g is the gravitational acceleration; The impact force F of a single ball pair is: Where M is the mass of the ball, v is the ball speed, and t is the rebound time; The impact force of the small ball on the first anchoring device should be smaller than the maximum load of the damping shock absorbing device.

5. The offshore gas well fixed pipe string drainage and production enhancement device according to claim 4 is characterized in that: The porosity of the wellbore after the accumulation of the small balls is 25% to 35%, and the equivalent diameter of the wellbore is reduced to 25% to 35% of the original diameter; after filling the small balls, the critical production Qc of natural gas is: Where A is the cross-sectional area of ​​the wellbore; z is the compressibility factor; T is the temperature; p is the pressure; v t is the air flow velocity and η is the stacking coefficient.

6. The offshore gas well fixed pipe string drainage and production enhancement device according to claim 1, characterized in that: The blowout preventer is also provided on the blowout preventer pipe column, and the blowout preventer is located below the gate.

7. The offshore gas well fixed pipe string drainage and production enhancement device according to claim 4, characterized in that: The blowout preventer is a sailboard-type blowout preventer, and the gate is a blowout preventer gate.

8. A method for increasing production by draining water from an immovable pipe string of an offshore gas well, applied to the device for increasing production by draining water from an immovable pipe string of an offshore gas well as claimed in any one of claims 1 to 7, characterized in that: include: Install a blowout preventer string at the wellhead of an offshore gas well and install a blowout preventer gate on the blowout preventer string; Connecting the connecting component to the traction component, and placing the connecting component, the first anchoring device and the soluble plugging component into the oil pipe of the wellbore through the traction component; When the soluble plugging member reaches the preset position, the first anchoring device is fixed to the peripheral wall of the oil pipe to fix the soluble plugging member at the preset position, and the production channel is blocked by the soluble sealing member; Disassemble the traction component from the connection component and take it out of the oil pipe; Open the gate on the blowout preventer string and put the filler into the oil pipe to reduce the cross-sectional area of ​​the gas production channel in the oil pipe; After the filling is completed, the second anchoring device is placed into the oil pipe by using the traction component and fixed at the top of the filling to restrict the movement of the filling; Disassembling the traction member from the second anchoring device and taking it out of the oil pipe; The blowout preventer string is removed from the wellhead, and the soluble plug is dissolved so that gas and liquid can be produced through the gas production channel in the oil pipe.

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