Blowout prevention and leak plugging device for production tree maintenance

Abstract

The present invention discloses a blowout prevention and leakage plugging device for the maintenance of a Christmas tree. The device is provided with a plugging screw rod, a slip support seat and a rubber barrel. A venting channel is arranged in the rod body of the plugging screw rod. The upper part of the plugging screw rod is sequentially threadedly connected with a bottom hole vent valve, a plugging nut and a packing locking gland from top to bottom. The bottom hole vent valve is connected with a tank truck through a pipeline; both ends of the inner support cylinder are respectively connected with the packing locking gland and the slip support seat. A packing is installed between the inner support cylinder and the packing locking gland. Slips are installed in the shell wall of the slip support seat; a fixing nut, a rubber barrel support, a spring and a slip seat are sequentially installed on the lower part of the plugging screw rod from bottom to top. The fixing nut and the rubber barrel support are connected with the lower part of the plugging screw rod; a clamp support outer cylinder is installed outside the inner support cylinder. It greatly facilitates the overflow venting operation during the maintenance construction of the Christmas tree in an injection well and overcomes various drawbacks of the kill and emergency repair of the Christmas tree in a flowing well, protects the environment and the reservoir, and greatly improves the maintenance efficiency.

Description

Technical Field

[0001] The present invention relates to blowout prevention and leak plugging facilities for oil production trees of injection wells and flowing wells in the oil industry, and particularly to a blowout prevention and leak plugging device for the maintenance of oil production trees. Background Art

[0002] An injection well is a well used to inject water into an oil reservoir. During the development of an oilfield, water is injected into the reservoir through specialized injection wells to maintain or restore the reservoir pressure, enabling the reservoir to have a strong driving force to improve the production rate and recovery factor of the reservoir. This is a commonly used production method in oilfields.

[0003] When a fitting in the oil production tree of an injection well head leaks or the valve in the oil production tree is not tightly closed and maintenance is required, it is necessary to close the control valve in the water distribution station to stop water injection. Since there is pressure in the injection well, after stopping water injection, under the action of the well pressure, the water in the wellbore will flow back to the well head and overflow from the well head, so it is necessary to release the overflow at the well head of the injection well. However, for some injection wells in low-permeability oil wells, the bottom pressure of the well mainly returns to the well head through the downhole injection string. Normally, the vent valve in the oil production tree of the injection well head is opened, and a tanker is used to depressurize and vent until the overflow is completely drained before the oil production tree at the well head can be disassembled for the maintenance and replacement construction of components.

[0004] However, for many injection wells in oil wells with extremely poor formation permeability, the overflow cannot be completely drained for a long time, resulting in a long construction time, a large number of water transport vehicles and personnel being mobilized, not only increasing production costs but also extending the injection stop time of the injection well, which has an adverse impact on production.

[0005] Therefore, it is necessary to manufacture a tool that can block the downhole pressure of injection wells to ensure normal construction.

[0006] Currently, when the oil production tree in a flowing well needs to be repaired and replaced with fittings, there is no good solution. The common methods are as follows:

[0007] 1. Construction workers wear raincoats and rush to repair under gushing conditions. This construction method is dangerous for both construction workers and flowing wells and does not comply with the safety construction regulations.

[0008] 2. The kill well method: Repair after suppressing the pressure in the flowing well. This method has the following problems: First, a large number of equipment and personnel are mobilized; second, kill fluid needs to be injected into the well, which is likely to block the reservoir and cause damage to the reservoir; third, the construction time is long and the maintenance efficiency is low.

[0009] After retrieval, there are the following several patent technologies related to wellhead plugging:

[0010] The patent numbers are 201010114240.6 and 201020122077.3. It is the "Blowout Preventer and Leak Stopper Device for the Large Four-way of Christmas Tree" which is applied for both invention and utility model simultaneously. It mainly consists of a support plate, an upper fixing rod, an adjusting nut, a lead screw, a main body, a lower fixing rod, a slip body and a sealing body. The support plate is made of steel plate, and the support plate is fan-shaped with fixing holes at both ends. It can fix the support plate on the upper and lower flanges of the large four-way of the Christmas tree through the fixing holes. The support plate has two concentric arc-shaped holes. The main body is a columnar body, which can be a cylinder or a rectangular columnar body. There is a threaded hole perpendicular to the central axis in the middle of the main body, and there is a lead screw in the threaded hole of the main body. One end of the lead screw is connected with an arc-shaped slip body. The arc-shaped slip body is movably connected to the end of the lead screw. When the lead screw rotates, the slip body can remain stationary. The inner arc radius of the arc-shaped slip body is the same as the outer radius of the large four-way of the Christmas tree. An arc-shaped sealing body is fixed on the inner side of the arc-shaped slip body. The sealing body is made of sealing materials such as rubber sheet, polyester rubber sheet, etc.

[0011] The above-mentioned patented technology can plug the leakage holes of the large four-way of the Christmas tree in the oil production well. During the production and operation process, if the large four-way leaks or has a blowout, the above-mentioned patented technology can timely control the leakage of the large four-way of the Christmas tree to meet the requirements of well control measures. Ensure that the emergency rescue personnel can implement the blowout accident rescue and disposal safely, quickly and effectively.

[0012] However, the above-mentioned patented technology is specifically used for plugging the large four-way of the Christmas tree in the oil production well, and is a plugging device provided for the implementation of blowout accident rescue. It cannot be used in the injection well and cannot solve the problem of overflow of the well during the maintenance and replacement of parts of the Christmas tree in the injection well.

[0013] The bottom flow diverter for injection well with the patent number 201620736630.X includes an upper joint, an upper middle casing, an inner casing string, an outer casing, a connecting rod rubber sleeve assembly, a central casing, a connecting sleeve, a lower joint sleeve, a lower joint sealing sleeve and a shaft sleeve. An outer casing is connected under the outer part of the upper joint, an upper middle casing is connected inside the upper joint, a shaft sleeve is connected under the upper middle casing, there are through holes on the side wall of the shaft sleeve, a connecting rod rubber sleeve assembly is connected under the shaft sleeve, an inner casing string is connected inside the upper joint and outside the upper middle casing through a snap ring and an upper unsealing pin, a central casing is connected inside the outer casing under the inner casing string, a central sleeve is arranged corresponding to the lower part of the connecting rod rubber sleeve assembly inside the central casing, there are liquid passing holes axially on the wall of the central sleeve, there are liquid passing holes radially on the wall of the central casing, an outer central pipe sleeve is connected outside the central casing corresponding to the liquid passing holes through a middle unsealing pin, a connecting sleeve is connected outside the central casing under the outer central pipe sleeve, a lower joint sleeve is connected under the central casing, a lower joint sealing sleeve is connected under the lower joint sleeve, a valve seat is connected inside the lower joint sealing sleeve through a lower pin, a valve ball is arranged on the valve seat, a valve ball limiting plate is arranged inside the lower joint sealing sleeve above and below the valve ball, and there are through holes axially on the valve ball limiting plate. This bottom flow diverter tool for injection well adopts the downhole reserved plugging process, which can realize the plugging function during the downhole process, the normal pipe string injection and washing well functions; when operating, probe the artificial bottom hole, then the sealing ball can be released to realize the plugging at the bottom of the pipe string, block the high-pressure liquid flow at the bottom of the pipe string from entering the pipe string, and recover it through the casing by the casing gate at the wellhead. Therefore, this bottom flow diverter tool has the functions of plugging when pulling out the pipe string during operation, plugging when lowering the pipe string during operation and backwashing well during normal injection production, preventing the liquid flow in the pipe string from discharging during the operation process, and realizing the green and environmental protection operation construction. This bottom flow diverter for injection well solves the problems of overflow environmental protection during the injection well operation construction and plugging at the bottom of the pipe string during operation. It has the characteristics of reducing the operation overflow discharge, can be applied to pressure-controlled operations and conventional operations, realizes the bottom plugging function of the injection well, reduces the internal overflow of the tubing during the process of pulling out and lowering the pipe string in the injection well operation, and has the characteristics of environmental protection in the injection well construction. This bottom flow diverter tool for injection well adopts the downhole reserved plugging process, which can realize the plugging function during the downhole process, the normal pipe string injection and washing well functions; when operating, probe the artificial bottom hole, then the sealing ball can be released to realize the plugging at the bottom of the pipe string, block the high-pressure liquid flow at the bottom of the pipe string from entering the pipe string, and recover it through the casing by the casing gate at the wellhead. Therefore, this bottom flow diverter tool has the functions of plugging when pulling out the pipe string during operation, plugging when lowering the pipe string during operation and backwashing well during normal injection production, preventing the liquid flow in the pipe string from discharging during the operation process, and realizing the green and environmental protection operation construction. This bottom flow diverter for injection well solves the problems of overflow environmental protection during the injection well operation construction and plugging at the bottom of the pipe string during operation. It has the characteristics of reducing the operation overflow discharge, can be applied to pressure-controlled operations and conventional operations, realizes the bottom plugging function of the injection well, reduces the internal overflow of the tubing during the process of pulling out and lowering the pipe string in the injection well operation, and has the characteristics of environmental protection in the injection well construction.

[0014] The above-mentioned patented technology aims to solve the problems that during the downhole operation construction of injection wells, the plugging performance of the flow diversion device is unreliable, it cannot completely solve the problem of environmental pollution caused by the overflow during the downhole operation of injection wells, and it cannot be used to solve the problem of wellbore overflow during the maintenance and replacement of components of the production tree of injection wells.

[0015] During the maintenance and replacement of components of the production tree of injection wells and flowing well production trees, the problem of wellbore overflow affecting the maintenance construction needs to be solved. Summary of the Invention

[0016] The present invention provides a blowout prevention and plugging device for production tree maintenance, which solves the problems of difficult maintenance, long replacement time of components, and easy environmental pollution during the maintenance and replacement of components of the production tree of oilfield injection wells and flowing well production trees. It protects the environment, shortens the maintenance time, improves the maintenance efficiency, and reduces the labor intensity of workers.

[0017] The technical solution of the present invention is as follows:

[0018] The blowout prevention and plugging device for production tree maintenance is provided with a plugging lead screw, a plugging nut, a packing locking gland, a clamp support outer cylinder, an inner support cylinder, a slip support seat, and a rubber cylinder. Among them:

[0019] A venting channel is provided in the rod body of the plugging lead screw. The upper part of the plugging lead screw is sequentially threadedly connected with a bottom hole vent valve, a plugging nut, and a packing locking gland from top to bottom. The bottom hole vent valve is connected to a tank truck through a pipeline;

[0020] Both ends of the inner support cylinder are respectively connected to the packing locking gland and the slip support seat. A packing is installed between the inner support cylinder and the packing locking gland, and slips are installed in the shell wall of the slip support seat;

[0021] The lower part of the plugging lead screw is sequentially installed with a fixing nut, a rubber cylinder support, a spring, and a slip seat from bottom to top. The fixing nut and the rubber cylinder support are connected to the lower part of the plugging lead screw;

[0022] The rubber cylinder is installed outside the rubber cylinder support and is located below the slip support seat;

[0023] The clamp support outer cylinder is installed outside the inner support cylinder.

[0024] Preferably, the outer side of the slip is provided with slip teeth and a fixing groove, and the lower end of the inner side is provided with a displacement chamfer, and the angle of the displacement chamfer is 45 degrees.

[0025] Preferably, at least three slips are installed in the shell wall of the slip support seat, and the slips are fixed in the slip support seat through high-strength spring rings installed in the fixing grooves on the outer side of the slips.

[0026] Preferably, the upper part of the slip seat is a cone and the lower part is provided with a spring installation cavity, and the spring is installed between the spring installation cavity and the rubber barrel support; the taper of the upper cone of the slip seat is set to 45 degrees.

[0027] Preferably, the lower inner cavity of the slip support seat is larger than the upper outer circles of the slip seat and the rubber barrel support, and the lower outer wall of the slip support seat is provided with an external chamfer, and the angle of the external chamfer is set between 35 degrees and 55 degrees, which is convenient for extruding the rubber barrel to expand it; the outer circle of the rubber barrel in the normal state conforms to the outer circle of the slip support seat.

[0028] Preferably, the inner circles at both ends of the inner support cylinder are respectively threadedly connected to the outer circles of the packing gland and the slip support seat; the lower outer circle of the plugging lead screw is threadedly connected to the rubber barrel support and the fixing nut.

[0029] Preferably, the upper inner cavity of the inner support cylinder is provided with a packing installation step, and the packing is installed between the packing installation step and the packing gland; the upper outer wall of the packing gland is provided with a wrench square.

[0030] Preferably, the lower end face of the clamp support outer cylinder is provided with a clamp groove, and through this clamp groove, it can be connected to the clamp head at the upper end of the production tree of the water injection well or the production tree of the flowing well by a clamp; a support outer cylinder sealing ring is provided in the upper central hole of the clamp support outer cylinder; an auxiliary vent connection head is further provided on the upper outer wall of the clamp support outer cylinder, and an auxiliary vent valve can be installed through the auxiliary vent connection head.

[0031] Preferably, the bottom vent valve is connected to the upper end of the plugging lead screw through a tee; a pressure gauge is further installed at the upper end of the tee.

[0032] Preferably, a gland sealing ring is further installed between the packing gland and the inner support cylinder; the outer diameter of the slip support seat is smaller than the inner diameter of the water injection string hanger or the flowing well production string hanger.

[0033] The remarkable use effect of the present invention is:

[0034] 1. It changes the current way of first venting and then repairing the production tree of the water injection well, overcomes the problems of incomplete overflow discharge, difficult construction, and long repair time in the water injection well of low-permeability oil wells in the existing repair mode; it can repair while venting, greatly shortening the repair time and improving the repair efficiency.

[0035] 2. It changes the current way of killing and repairing the production tree of the flowing well, protects the reservoir, reduces the use of repair equipment, and greatly reduces the repair cost.

[0036] 3. Since the present invention is provided with a plugging lead screw, a rubber barrel and a rubber barrel support, the rubber barrel and the rubber barrel support are installed at the bottom of the plugging lead screw, and slips are installed in the slip support seat above the rubber barrel. Rotating the plugging lead screw upward can clamp the present invention in the inner wall of the water injection string hanger. After the lower half of the present invention is lowered from the top of the oil production tree of the water injection well into the water injection string hanger and the clamp support outer cylinder is connected to the upper clamp head of the oil production tree of the water injection well, the downhole pressure and overflow are blocked. For the water injection wells of low-permeability oil wells, normal construction can be carried out without emptying.

[0037] 4. The present invention installs a bottom hole vent valve at the top of the plugging lead screw and sets a vent passage in the plugging lead screw. In line with the principle of safety first, the well without pressure is regarded as a well with pressure for construction, and it is also suitable for use in all water injection wells.

[0038] 5. In order to facilitate observing the bottom hole pressure, the present invention installs a pressure gauge above the plugging lead screw and the bottom hole vent valve, and also connects an auxiliary vent valve in the clamp support outer cylinder. In case of poor sealing of the rubber barrel, the liquid leaking from the water injection string hanger or the production string hanger of the flowing well into the oil production tree can also be discharged through the auxiliary vent valve, which greatly facilitates the overflow vent operation during the maintenance construction of the oil production tree of the water injection well and overcomes various drawbacks of the kill and repair of the flowing well oil production tree, protects the environment and the reservoir, and greatly improves the maintenance efficiency.

[0039] 6. After using the present invention, within the period when the residual pressure in the water injection well does not recover to an uncontrollable level in a short time, the present invention can be lowered into the inner part of the water injection string hanger, artificially plug the water injection string, cut off the overflow returning from the upper part of the water injection string, and the construction personnel can be organized in time to repair, disassemble and replace the accessories of the wellhead oil production tree, and resume normal water injection in the shortest time.

[0040] 7. The present invention has a reasonable structure, is convenient to operate, and has a low processing cost, and is suitable for the maintenance of the oil production tree of the water injection well and the flowing well oil production tree.

[0041] 8. In summary, the present invention has remarkable use effects and can achieve good economic benefits, and has good application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention, and do not constitute a limitation to the present invention. In the drawings:

[0043] Figure 1 is the external structure schematic diagram of the structural schematic diagram of the present invention.

[0044] Figure 2 is the sectional view of the structural schematic diagram of the present invention.

[0045] In the figure: pressure gauge 1, three-way pipe 2, plugging lead screw 3, plugging nut 4, packing locking gland 5, locking gland sealing ring 6, clamp support outer cylinder 7, support outer cylinder sealing ring 8, packing 9, inner support cylinder 10, slip support seat 11, slips 12, slip seat 13, spring 14, rubber barrel 15, rubber barrel support 16, fixing nut 17, bottom hole bleeding valve 18, auxiliary bleeding valve 19. Specific implementation mode

[0046] The accompanying drawings are only for reference and illustration purposes, and are not intended to limit the protection scope of the present invention. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to the protection scope of the present invention.

[0047] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0048] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, in the description of the present invention, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0049] See Figure 1 and Figure 2 , the blowout prevention and leakage plugging device for production tree maintenance is provided with a plugging lead screw 3, a plugging nut 4, a packing locking gland 5, a clamp support outer cylinder 7, an inner support cylinder 10, a slip support seat 11 and a rubber barrel 15, wherein:

[0050] A bleeding channel is provided in the rod body of the plugging lead screw 3. The upper part of the plugging lead screw 3 is sequentially threadedly connected with the bottom hole bleeding valve 18, the plugging nut 4 and the packing locking gland 5 from top to bottom. The bottom hole bleeding valve 18 is connected to the tanker through a pipeline;

[0051] Both ends of the inner support cylinder 10 are respectively connected to the packing locking gland 5 and the slip support seat 11. A packing 9 is installed between the inner support cylinder 10 and the packing locking gland 5. A slip 12 is installed in the shell wall of the slip support seat 11;

[0052] The lower part of the plugging lead screw 3 is successively installed with a fixing nut 17, a rubber barrel support 16, a spring 14 and a slip seat 13 from bottom to top. The fixing nut 17 and the rubber barrel support 16 are connected to the lower part of the plugging lead screw 3;

[0053] The rubber barrel 15 is installed outside the rubber barrel support 16 and below the slip support seat 11;

[0054] A clamp support outer cylinder 7 is installed outside the inner support cylinder 10.

[0055] In use, the slip support seat 11 is lowered from the top of the production tree of the water injection well or the flowing well into the water injection pipe string hanger or the flowing well production pipe string hanger, and the clamp support outer cylinder 7 is connected to the upper clamp head of the production tree of the water injection well or the flowing well through a clamp.

[0056] When the production tree of the water injection well needs to be repaired, close the control valve of the water distribution room and stop water injection; when the production tree of the flowing well needs to be repaired, close the production valve in the wellhead production process. After connecting the clamp support outer cylinder 7 in the present invention to the production tree of the wellhead, the plugging nut 4 can be tightened, so that the plugging lead screw 3 rotates upward in the packing locking gland 5 and drives the rubber barrel support 16 and the rubber barrel 15 to move upward together.

[0057] When the plugging lead screw 3 moves upward, the spring 14 presses the slip seat 13 upward when the rubber barrel support 16 moves upward and pushes the slip 12 to the outside of the slip support seat 11. The slip 12 clamps the whole device to the inner wall of the hanger of the water injection pipe string or the production pipe string of the flowing well. The rubber barrel 15 plugs the annulus between the hanger and the present device. Due to the presence of the packing 19 and the rubber barrel 15, the overflow from the well cannot return from this annulus.

[0058] The liquid overflowing from the bottom of the water injection well or the flowing well can be transported to the tanker through the bottom blowdown valve 18 and the pipeline. In this way, while discharging the underground overflow of the water injection well or diverting the underground overflow of the flowing well, the maintenance and component replacement of the production tree of the water injection well or the flowing well can be carried out. It facilitates maintenance, protects the environment, shortens the maintenance time, improves the maintenance efficiency, and reduces the labor intensity of workers. It solves the problem that there is pressure at the bottom of the current water injection well and the well overflow cannot be discharged completely, and at the same time changes the maintenance method of the production tree of the flowing well, and has remarkable use effects.

[0059] On the basis of the above-mentioned first embodiment, the present invention also has the following embodiments:

[0060] The outside of the slip 12 is provided with slip teeth and fixing grooves, and the lower end of the inner side is provided with a displacement chamfer, and the angle of the displacement chamfer is 45 degrees.

[0061] At least three slips 12 are installed in the shell wall of the slip support base 11. The slips 12 are fixed in the slip support base 11 by high-strength spring rings installed in the fixing grooves on the outside of the slips 12. The number of slips 12 can be three, four, five, etc.

[0062] The upper part of the slip seat 13 is a conical body, and the lower part is provided with a spring installation cavity. The spring 14 is installed between the spring installation cavity and the rubber barrel support 16; the taper of the conical body in the upper part of the slip seat 13 is set to 45 degrees. The taper of the conical body in the upper part of the slip seat 13 is consistent with the displacement chamfer at the lower end of the inner side of the slip 12, which can make the slip 12 shift easily. When the slip seat 13 moves upward driven by the plugging lead screw 3 and the rubber barrel support 16, the slip 12 can overcome the binding force of the high-strength spring ring and pop out from the slip support base 11, and clamp tightly in the inner wall of the water injection string or the production string hanger.

[0063] The lower inner cavity of the slip support base 11 is larger than the upper outer circles of the slip seat 13 and the rubber barrel support 16. The lower outer wall of the slip support base 11 is provided with an outer chamfer, and the angle of the outer chamfer is set between 35 degrees and 55 degrees, which is convenient for squeezing the rubber barrel 15 to make it expand; the outer circle of the rubber barrel 15 in the normal state conforms to the outer circle of the slip support base 11. When the rubber barrel support 16 drives the rubber barrel 15 to move upward and is compressed by the slip support base 11, the outer circle of the rubber barrel 15 after expansion is larger than the outer circle of the slip support base 11, which can block the inner wall of the hanger and prevent the underground overflow from flowing upward.

[0064] The inner circles at both ends of the inner support cylinder 10 are respectively threadedly connected with the outer circles of the packing locking gland 5 and the slip support base 11; the lower outer circle of the plugging lead screw 3 is threadedly connected with the rubber barrel support 16 and the fixing nut 17. It is more convenient to threadedly connect the lower outer circle of the plugging lead screw 3 with the rubber barrel support 16 and the fixing nut 17. The rubber barrel support 16 and the fixing nut 17 can also be fixed to the lower part of the plugging lead screw 3 by welding.

[0065] The upper inner cavity of the inner support cylinder 10 is provided with a packing installation step. The packing 9 is installed between the packing installation step and the packing locking gland 5; the upper outer wall of the packing locking gland 5 is provided with a wrench square. By rotating and pressing down the packing locking gland 5, the packing 9 can be tightly pressed.

[0066] The lower end face of the clamp support outer cylinder 7 is provided with a clamp groove, through which it can be clamped and connected with the clamp head at the upper end of the oil production tree of the water injection well or the oil production tree of the flowing well; a support outer cylinder sealing ring 8 is arranged in the upper central hole of the clamp support outer cylinder 7; an auxiliary vent connection head is further arranged on the outer wall of the upper part of the clamp support outer cylinder 7, and an auxiliary vent valve 19 can be installed through the auxiliary vent connection head. Through the auxiliary vent valve 19, the liquid leaking into the oil production tree from the water injection pipe string hanger or the oil production pipe string hanger can be discharged in case the rubber cylinder 15 is not tightly sealed.

[0067] The bottom vent valve 18 is connected to the upper end of the plugging lead screw 3 through a tee pipe 2; a pressure gauge 1 is further installed at the upper end of the tee pipe 2. Through the pressure gauge 1, the bottom hole pressure of the water injection well or the flowing well can be observed at any time. Of course, the pressure gauge 1 can also not be installed, and the bottom vent valve 18 connected to the tanker can be kept in an open state.

[0068] A locking gland sealing ring 6 is further arranged between the packing locking gland 5 and the inner support cylinder 10; the outer diameter of the slip support seat 11 is smaller than the inner diameter of the water injection pipe string hanger or the oil production pipe string hanger of the flowing well.

[0069] The above-described embodiments are only typical embodiments, but the present invention is not limited to these embodiments, and those skilled in the art can make modifications without departing from the spirit and inspiration of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the creative spirit and creative concept of the present invention shall be included within the protection scope of the present invention. Therefore, the protection scope is not limited to the above description.

Claims

1. Blowout prevention and leak plugging device for production tree maintenance, characterized in that, There are a plugging lead screw (3), a plugging nut (4), a packing locking gland (5), a clamp support outer cylinder (7), an inner support cylinder (10), a slip support seat (11) and a rubber barrel (15), where: there is a venting channel in the rod body of the plugging lead screw (3), and the upper part of the plugging lead screw (3) is sequentially threadedly connected with the bottom hole vent valve (18), the plugging nut (4), and the packing locking gland (5) from top to bottom, and the bottom hole vent valve (18) is connected to a tanker through a pipeline; both ends of the inner support cylinder (10) are respectively connected with the packing locking gland (5) and the slip support seat (11), a packing (9) is installed between the inner support cylinder (10) and the packing locking gland (5), and slips (12) are installed in the shell wall of the slip support seat (11); the lower part of the plugging lead screw (3) is sequentially installed with a fixing nut (17), a rubber barrel support (16), a spring (14) and a slip seat (13) from bottom to top, and the fixing nut (17) and the rubber barrel support (16) are connected to the lower part of the plugging lead screw (3); the rubber barrel (15) is installed outside the rubber barrel support (16) and is located below the slip support seat (11); the clamp support outer cylinder (7) is installed outside the inner support cylinder (10); the lower end face of the clamp support outer cylinder (7) is provided with a clamp groove, and through this clamp groove, it can be clamped and connected with the clamp head at the upper end of an oil production tree of an injection well or a flowing well; a support outer cylinder sealing ring (8) is arranged in the upper central hole of the clamp support outer cylinder (7); an auxiliary venting connector is also arranged on the upper outer wall of the clamp support outer cylinder (7), and an auxiliary venting valve (19) can be installed through the auxiliary venting connector.

2. The blowout prevention and leak plugging device for oil production tree maintenance according to claim 1, characterized in that, The outer side of the slip (12) is provided with slip teeth and a fixing groove, and the lower end of the inner side is provided with a displacement chamfer, and the angle of the displacement chamfer is 45 degrees.

3. The blowout prevention and leakage plugging device for oil production tree maintenance according to claim 2, characterized in that, At least three slips (12) are installed in the shell wall of the slip support seat (11), and the slips (12) are fixed in the slip support seat (11) through high-strength spring rings installed in the fixing grooves on the outer sides of the slips (12).

4. The blowout preventer and leak stoppage device for oil production tree maintenance according to claim 2, characterized in that, The upper part of the slip seat (13) is a cone body, and the lower part is provided with a spring installation cavity, and the spring (14) is installed between the spring installation cavity and the rubber barrel support (16); the taper of the upper cone body of the slip seat (13) is set to 45 degrees.

5. The blowout prevention and leakage plugging device for oil production tree maintenance according to claim 3, characterized in that, The lower inner cavity of the slip support seat (11) is larger than the upper outer circles of the slip seat (13) and the rubber barrel support (16), and the lower outer wall of the slip support seat (11) is provided with an outer chamfer, and the angle of the outer chamfer is set between 35 degrees and 55 degrees, which is convenient for extruding the rubber barrel (15) to expand it; The outer circle of the rubber barrel (15) under normal conditions conforms to the outer circle of the slip support seat (11).

6. The blowout prevention and leakage plugging device for oil production tree maintenance according to claim 1, characterized in that, The inner circles at both ends of the inner support cylinder (10) are respectively threadedly connected with the outer circles of the packing locking gland (5) and the slip support seat (11); the outer circle of the lower part of the plugging lead screw (3) is threadedly connected with the rubber barrel support (16) and the fixing nut (17).

7. The blowout prevention and leakage plugging device for Christmas tree maintenance according to claim 1 or 6, characterized in that, The upper inner cavity of the inner support cylinder (10) is provided with a packing installation step, and the packing (9) is installed between the packing installation step and the packing locking gland (5); a wrench square is provided on the upper outer wall of the packing locking gland (5).

8. The blowout prevention and leak plugging device for production tree maintenance according to claim 1, characterized in that, The bottom hole drain valve (18) is connected to the upper end of the plugging lead screw (3) through a tee pipe (2); a pressure gauge (1) is also installed at the upper end of the tee pipe (2).

9. The blowout preventer and leak plugging device for oil production tree maintenance according to claim 7, characterized in that, A locking gland sealing ring (6) is also installed between the packing locking gland (5) and the inner support cylinder (10); the outer diameter of the slip support seat (11) is smaller than the inner diameter of the water injection pipe string hanger or the production pipe string hanger of a flowing well.

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