CN116427875A - Blowout-preventing plugging device for maintaining christmas tree - Google Patents

Abstract

The utility model discloses a blowout prevention plugging device for maintaining a christmas tree, which is provided with a plugging lead screw, a slip support seat and a rubber cylinder, wherein a vent channel is arranged in a rod body of the plugging lead screw, the upper part of the plugging lead screw is sequentially connected with a bottom hole vent valve, a plugging nut and a packing locking gland in a threaded manner from top to bottom, and the bottom hole vent valve is connected with a tank truck through a pipeline; the two ends of the inner support cylinder are respectively connected with a packing locking gland and a slip support seat, packing is arranged between the inner support cylinder and the packing locking gland, and slips are arranged in the shell wall of the slip support seat; the lower part of the plugging screw rod is sequentially provided with a fixing nut, a rubber cylinder support, a spring and a slip seat from bottom to top, and the fixing nut and the rubber cylinder support are connected with the lower part of the plugging screw rod; the outer supporting cylinder is provided with a clamp for supporting the outer cylinder. The overflow emptying operation in the maintenance and construction process of the production tree of the water injection well is greatly facilitated, various defects of well control and rush repair of the production tree of the self-injection well are overcome, the environment and the reservoir are protected, and the maintenance efficiency is greatly improved.

Description

Blowout-preventing plugging device for maintaining christmas tree

Technical Field

The utility model relates to a blowout-preventing and plugging device for a christmas tree of a water injection well and a christmas tree of a self-injection well in the petroleum industry, in particular to a blowout-preventing and plugging device for maintenance of the christmas tree.

Background

An injection well is a well used to inject water into an oil reservoir. In the development process of the oil field, water is injected into the oil reservoir through a special water injection well, the pressure of the oil reservoir is maintained or recovered, so that the oil reservoir has stronger driving force, the exploitation speed and the recovery ratio of the oil reservoir are improved, and the method is a common exploitation means of the oil field.

When the fittings in the wellhead christmas tree of the water injection well are in thorny leakage or the valves in the christmas tree are not tightly closed for maintenance, the control valves in the water distribution room are required to be closed, and water injection is stopped; because the pressure exists in the water injection well, after water injection is stopped, water in the well shaft can return to the well head under the action of the pressure in the well head and overflows from the well head, and then the overflow is required to be placed at the well head of the water injection well. But the bottom hole pressure of the water injection well of some low permeability oil wells mainly returns to the wellhead through the underground water injection pipe column, under normal conditions, the emptying gate in the wellhead production tree of the water injection well is opened, the tank car is used for pressure relief and emptying until overflow is completely discharged, and the wellhead production tree can be detached, so that maintenance and replacement construction of components are performed.

However, there are many water injection wells of the oil well with extremely poor stratum permeability, and the water injection wells are not completely discharged for a long time, so that the construction time is long, the number of water transportation vehicles and people are increased, the production cost is increased, the stop time of the water injection well is prolonged, and adverse effects are brought to production.

Therefore, a tool capable of plugging the underground pressure of the water injection well is required to be manufactured, and normal construction is ensured.

At present, when the christmas tree in the self-injection well needs to be maintained and accessories are replaced, no good method exists, and the common method is as follows:

1. the constructor wears the raincoat, and the constructor sprays the rush repair, the construction mode has danger to constructors and self-injection wells, and the construction mode does not accord with the safety construction regulation.

2. Well killing method: the first method is that the equipment is more and the personnel are more; secondly, well killing liquid is injected into the well, so that a reservoir is easily blocked, and the reservoir is damaged; thirdly, the construction time is long, and the maintenance efficiency is low.

Through retrieval, the patent technology related to wellhead plugging has the following technologies:

the utility model and the utility model simultaneously apply for the 'large four-way blowout-preventing plugging device of the christmas tree', which is provided with 201010114240.6 and 201020122077.3, mainly comprises a supporting plate, an upper fixing rod, an adjusting nut, a screw rod, a main body, a lower fixing rod, a slip body and a sealing body, wherein the supporting plate is made of steel plates, is in a fan shape, has fixing holes at two ends, and can be fixed on an upper flange and a lower flange of the large four-way of the christmas tree through the fixing holes. The support plate has two concentric arcuate holes. The main body is a columnar body, and can be a cylinder or a rectangular columnar body. There is the screw of perpendicular central line at the main part middle part, has a lead screw in the screw of main part, and the one end of lead screw is connected with the arc slips body, and arc slips body and lead screw tip swing joint, slips can keep not rotating when rotatory lead screw. The radius of the inner arc of the arc slip body is the same as the external radius of the large four-way body of the christmas tree. An arc-shaped sealing body is fixed on the inner side of the arc-shaped slip body, and the sealing body is made of sealing materials, such as a rubber plate, a polyester rubber plate and the like.

The technology can be used for plugging the puncture hole of the large four-way of the christmas tree in the oil production well. In the production and operation process, the large four-way joint is in thorn leakage or blowout, and the large four-way thorn leakage of the christmas tree can be timely controlled by utilizing the technology of the patent so as to meet the requirement of well control measures. The emergency personnel can safely, quickly and effectively implement the emergency treatment of blowout accidents.

However, the above-mentioned patent technology is a plugging device which is specially used for plugging a large four-way junction of a christmas tree in a production well and is provided for implementing emergency rescue of blowout accidents, and cannot be used for a water injection well, and the overflow problem of overflow in the well during maintenance and accessory replacement of the christmas tree of the water injection well cannot be solved.

The patent number 201620736630X injection well bottom shunt comprises an upper joint, an upper middle sleeve, an inner casing string, an outer sleeve, a connecting rod rubber sleeve combination, a central sleeve, a connecting sleeve, a lower joint sleeve and a shaft sleeve. The outer lower outer sleeve of the upper joint is connected with the upper middle sleeve in an inner joint, the shaft sleeve is connected with the shaft sleeve in a lower mode, the side wall of the shaft sleeve is provided with a through hole, the lower part of the shaft sleeve is connected with a connecting rod rubber sleeve combination, the inner part of the upper middle sleeve is connected with an inner sleeve post through a clamp spring and an upper unsealing pin nail, the inner part of the outer sleeve is connected with a central sleeve in a lower outer sleeve of the inner sleeve post, the central sleeve is correspondingly arranged under the connecting rod rubber sleeve combination in the central sleeve, the central sleeve is axially provided with a liquid through hole, the central sleeve wall is radially provided with a liquid through hole, the outer part of the central sleeve corresponding to the liquid through hole is connected with an outer central sleeve through a middle unsealing pin nail, the outer part of the outer central sleeve is externally connected with a connecting sleeve, the lower part of the central sleeve is connected with a lower joint sleeve, the lower joint sleeve is internally connected with a lower joint sealing sleeve through a lower pin, a valve seat is arranged on the valve seat, a valve ball limiting plate is arranged in the upper and lower joint sealing sleeve of the valve ball. The injection well bottom shunt tool adopts a downhole reserved plugging process, and can realize plugging function in the process of well descending and normal pipe column injection and well flushing functions; the manual shaft bottom is visited during operation, the sealing ball can be released, the bottom of the pipe column is blocked, high-pressure liquid flow at the bottom of the pipe column is blocked from entering the pipe column, and the high-pressure liquid flow is recovered by a wellhead sleeve gate through a sleeve, so that the bottom diverter tool has the functions of plugging the pipe column during operation, plugging the pipe column during operation and normal injection into a backwash well in production, the liquid flow in the pipe column is prevented from being discharged during operation, and the environment-friendly operation construction is realized. The injection well bottom shunt solves the problems of overflow environmental protection in injection well operation construction and pipe column bottom blocking during operation. The method has the advantages of reducing the overflow discharge of operation, being applicable to pressurized operation and conventional operation, realizing the bottom plugging function of the injection well, reducing the overflow of the oil pipe in the process of tripping the pipe column in the operation of the injection well, and having the characteristic of environmental protection in the construction of the injection well. The injection well bottom shunt tool can realize the plugging function in the well descending process and the normal pipe column injection and well flushing functions due to the adoption of the underground reserved plugging process; the manual shaft bottom is visited during operation, the sealing ball can be released, the bottom of the pipe column is blocked, high-pressure liquid flow at the bottom of the pipe column is blocked from entering the pipe column, and the high-pressure liquid flow is recovered by a wellhead sleeve gate through a sleeve, so that the bottom diverter tool has the functions of plugging the pipe column during operation, plugging the pipe column during operation and normal injection into a backwash well in production, the liquid flow in the pipe column is prevented from being discharged during operation, and the environment-friendly operation construction is realized. The injection well bottom shunt solves the problems of overflow environmental protection in injection well operation construction and pipe column bottom blocking during operation. The method has the advantages of reducing the overflow discharge of operation, being applicable to pressurized operation and conventional operation, realizing the bottom plugging function of the injection well, reducing the overflow of the oil pipe in the process of tripping the pipe column in the operation of the injection well, and having the characteristic of environmental protection in the construction of the injection well.

The above-mentioned patent technology is in order to solve current water injection well borehole operation work progress, and the shutoff performance of diverging device is unreliable, can not solve the problem of the easy polluted environment of overflow efflux in the water injection well borehole operation in-process completely, can't be used to the water injection well christmas tree maintenance and the problem that overflow overflows in the well when the accessory is changed.

When the maintenance and the accessory replacement of the christmas tree of the water injection well and the christmas tree of the self-injection well are carried out, the problem that the maintenance and the construction are influenced by overflow in the well needs to be solved.

Disclosure of Invention

The utility model provides a blowout prevention plugging device for maintaining a christmas tree, which solves the problems of high maintenance difficulty and long accessory replacement time and easy environmental pollution when maintaining and replacing accessories of a christmas tree of an oilfield water injection well and a christmas tree of a self-injection well. The environment is protected, the maintenance time is shortened, the maintenance efficiency is improved, and the labor intensity of workers is reduced.

The technical scheme of the utility model is as follows:

the blowout prevention plugging device for the maintenance of the christmas tree is provided with a plugging lead screw, a plugging nut, a packing locking gland, a clamp supporting outer barrel, an inner supporting barrel, a slip supporting seat and a rubber barrel, wherein:

the rod body of the plugging screw rod is internally provided with a vent channel, the upper part of the plugging screw rod is sequentially connected with a bottom hole vent valve, a plugging nut and a packing locking gland in a threaded manner from top to bottom, and the bottom hole vent valve is connected with the tank truck through a pipeline;

the two ends of the inner support cylinder are respectively connected with a packing locking gland and a slip support seat, packing is arranged between the inner support cylinder and the packing locking gland, and slips are arranged in the shell wall of the slip support seat;

the lower part of the plugging screw rod is sequentially provided with a fixing nut, a rubber cylinder support, a spring and a slip seat from bottom to top, and the fixing nut and the rubber cylinder support are connected with the lower part of the plugging screw rod;

the rubber cylinder is arranged outside the rubber cylinder support and is positioned below the slip support seat;

the outer supporting cylinder is provided with a clamp for supporting the outer cylinder.

Preferably, slip teeth and a fixed groove are arranged on the outer side of the slips, a displacement chamfer is arranged at the lower end of the inner side of the slip, and the angle of the displacement chamfer is 45 degrees.

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 fixing grooves on the outer sides of the slips.

Preferably, the upper part of the slip seat is a conical body, the lower part of the slip seat is provided with a spring installation cavity, and the spring is installed between the spring installation cavity and the rubber cylinder support; the taper of the cone at the upper part of the slip seat is set to be 45 degrees.

Preferably, the lower inner cavity of the slip support seat is larger than the upper outer circle of the slip seat and the rubber cylinder support, the outer wall of the lower part of the slip support seat is provided with an outer chamfer, and the angle of the outer chamfer is set between 35 degrees and 55 degrees, so that the rubber cylinder is conveniently extruded and expanded; the excircle of the rubber cylinder in a normal state is in line with the excircle of the slip support seat.

Preferably, the inner circles at the two ends of the inner support cylinder are respectively in threaded connection with the packing locking gland and the outer circle of the slip support seat; the lower excircle of the plugging screw rod is in threaded connection with the rubber cylinder support and the fixing nut.

Preferably, a packing mounting step is arranged in the inner cavity of the upper part of the inner support cylinder, and the packing is arranged between the packing mounting step and the packing locking gland; the outer wall of the upper part of the packing locking pressing cover is provided with a spanner.

Preferably, the lower end face of the clamp support outer barrel is provided with a clamp groove, and the clamp groove can be connected with a clamp head at the upper end of a christmas tree of a water injection well or a christmas tree of a self-injection well through a clamp; a supporting outer cylinder sealing ring is arranged in the upper central hole of the clamping hoop supporting outer cylinder; the clamp supports the upper portion outer wall of urceolus and still is equipped with supplementary blowdown connector, through supplementary blowdown connector can install supplementary blowdown valve.

Preferably, the bottom hole emptying valve is connected to the upper end of the plugging screw rod through a three-way pipe; the upper end of the three-way pipe is also provided with a pressure gauge.

Preferably, a locking gland sealing ring is also arranged between the packing locking gland and the inner supporting cylinder; the outer diameter of the slip support seat is smaller than the inner diameter of a water injection string hanger or a self-injection well oil production string hanger.

The utility model has the remarkable use effects that:

1. the method changes the prior maintenance mode of emptying and then maintaining the christmas tree of the water injection well, and solves the problems of incomplete overflow discharge, high construction difficulty and long maintenance time in the water injection well of the low-permeability oil production well in the prior maintenance mode; the maintenance can be performed while emptying, the maintenance time is greatly shortened, and the maintenance efficiency is improved.

2. The method changes the existing well control maintenance mode of the self-injection well christmas tree, protects the reservoir, reduces the use of maintenance equipment and greatly reduces the maintenance cost.

3. Because the utility model is provided with the plugging lead screw, the rubber cylinder and the rubber cylinder support are arranged at the bottom of the plugging lead screw, the slips are arranged in the slip supporting seat above the rubber cylinder, and the plugging lead screw can be clamped in the inner wall of the water injection string hanger by rotating upwards. The lower half part of the utility model is put into the water injection pipe column hanger from the top of the water injection well christmas tree, and after the clamp support outer cylinder is connected with the upper clamp head of the water injection well christmas tree, the underground pressure and overflow are blocked, and the water injection well of the low-permeability oil well can be normally constructed under the condition of not emptying.

4. The utility model installs the bottom hole emptying valve on the top of the plugging screw rod and sets the emptying channel in the plugging screw rod, which is based on the first principle of safety, and the utility model uses the pressureless well as the pressure well construction, and is also suitable for all water injection wells.

5. In order to facilitate observing the bottom hole pressure, the pressure gauge is arranged above the plugging lead screw and the bottom hole emptying valve, the auxiliary emptying valve is also connected in the clamp supporting outer cylinder, and the liquid leaking into the christmas tree from the water injection pipe column hanger or the self-injection well production pipe column hanger can be discharged through the auxiliary emptying valve if the sealing of the glue cylinder is not tight, so that the overflow emptying operation in the maintenance and construction process of the water injection well christmas tree is greatly facilitated, various defects of the self-injection well christmas tree in the well-killing emergency repair are overcome, the environment is protected, the reservoir is protected, and the maintenance efficiency is greatly improved.

6. After the utility model is used, the utility model can be put into the water injection pipe column hanger in a period of time when the residual pressure in the water injection well is not recovered to be uncontrollable in a short time, the water injection pipe column is manually blocked, the overflow from the water injection pipe column is cut off, constructors can be timely organized to repair, detach and replace wellhead christmas tree fittings, and normal water injection is recovered in the shortest time.

7. The utility model has reasonable structure, convenient operation and low processing cost, and is suitable for maintenance of the production tree of the water injection well and the production tree of the self-injection well.

8. In conclusion, the utility model has obvious use effect, can obtain better economic benefit and has good application value.

Drawings

The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate the utility model and together with the embodiments of the utility model, serve to explain the utility model. In the drawings:

fig. 1 is an external structural diagram of a structural diagram of the present utility model.

Fig. 2 is a schematic cross-sectional view of the structure of the present utility model.

In the figure: the automatic sealing device comprises a pressure gauge 1, a tee pipe 2, a sealing lead screw 3, a sealing nut 4, a packing locking gland 5, a locking gland sealing ring 6, a clamp supporting outer cylinder 7, a supporting outer cylinder sealing ring 8, a packing 9, an inner supporting cylinder 10, a slip supporting seat 11, slips 12, a slip seat 13, a spring 14, a rubber cylinder 15, a rubber cylinder support 16, a fixing nut 17, a bottom hole emptying valve 18 and an auxiliary emptying valve 19.

Detailed Description

The drawings are for reference and illustration purposes only and are not intended to limit the scope of the present utility model. The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

In the description of the present utility model, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. Furthermore, in the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Referring to fig. 1 and 2, the blowout prevention and plugging device for the christmas tree maintenance is provided with a plugging lead screw 3, a plugging nut 4, a packing locking gland 5, a clamp supporting outer cylinder 7, an inner supporting cylinder 10, a slip supporting seat 11 and a rubber cylinder 15, wherein:

the rod body of the plugging screw rod 3 is provided with a vent channel, the upper part of the plugging screw rod 3 is sequentially connected with a bottom hole vent valve 18, a plugging nut 4 and a packing locking gland 5 from top to bottom in a threaded manner, and the bottom hole vent valve 18 is connected with a tank car through a pipeline;

the two ends of the inner support cylinder 10 are respectively connected with the packing locking gland 5 and the slip support seat 11, packing 9 is arranged between the inner support cylinder 10 and the packing locking gland 5, and slips 12 are arranged in the shell wall of the slip support seat 11;

the lower part of the plugging lead screw 3 is provided with a fixing nut 17, a rubber cylinder support 16, a spring 14 and a slip seat 13 in sequence from bottom to top, and the fixing nut 17 and the rubber cylinder support 16 are connected with the lower part of the plugging lead screw 3;

the rubber cylinder 15 is arranged outside the rubber cylinder support 16 and is positioned below the slip support seat 11;

the outer support cylinder 7 is mounted outside the inner support cylinder 10 with a clip.

When the slip support seat 11 is used, the slip support seat 11 is put into the water injection pipe column hanger or the self-injection well production pipe column hanger from the top of the water injection well production tree or the self-injection well production tree, and the clamp support outer cylinder 7 is connected with the upper clamp head of the water injection well production tree or the self-injection well production tree through the clamp.

When the christmas tree of the water injection well needs to be maintained, a control valve of the water distribution room is closed, and water injection is stopped; when the production tree of the self-injection well needs to be maintained, a production valve in the wellhead production flow is closed. After the clamp support outer cylinder 7 is connected with a christmas tree at a wellhead, the plugging nut 4 can be screwed, so that the plugging screw rod 3 rotates upwards in the packing locking gland 5 and drives the rubber cylinder support 16 and the rubber cylinder 15 to upwards together.

When the plugging screw rod 3 is in the upward direction, the spring 14 pushes up the slip seat 13 and pushes the slip 12 out of the slip support seat 11 when the rubber cylinder support 16 is in the upward direction, the slip 12 clamps the whole device in the inner wall of the hanger of the water injection string or the oil production string, and the rubber cylinder 15 plugs the annulus between the hanger and the device. Due to the presence of packing 19 and packing 15, overflow from the well overflow cannot be returned from the annulus.

The liquid overflowed from the bottom of the water injection well or the self-injection well can be conveyed into the tank truck through the bottom hole emptying valve 18 and the pipeline, so that maintenance and replacement of components of the water injection well or the self-injection well christmas tree can be performed while the underground overflow of the water injection well is emptied or dredged. The maintenance is convenient, the environment is protected, the maintenance time is shortened, the maintenance efficiency is improved, and the labor intensity of workers is reduced. The problem that the pressure at the bottom of the water injection well and overflow in the well cannot be discharged cleanly at present is solved, and meanwhile, the maintenance mode of the self-injection well christmas tree is changed, so that the self-injection well christmas tree has a remarkable use effect.

On the basis of the first embodiment, the present utility model also has the following embodiments:

slip 12's outside is equipped with slips tooth and fixed slot and inboard lower extreme is equipped with the displacement chamfer, the angle of displacement chamfer is 45 degrees.

At least three slips 12 are installed in the shell wall of the slip support seat 11, the slips 12 are fixed in the slip support seat 11 through high-strength spring rings installed in fixing grooves on the outer sides of the slips 12, and the slips 12 can be three, four, five and the like.

The upper part of the slip seat 13 is a conical body, the lower part of the slip seat is provided with a spring installation cavity, and the spring 14 is installed between the spring installation cavity and the rubber cylinder support 16; the taper of the upper cone of the slip bowl 13 is set at 45 degrees. The taper of the cone at the upper part of the slip seat 13 is consistent with the displacement chamfer angle of the lower end at the inner side of the slip 12, so that the slip 12 can be easily displaced. When the slip seat 13 is driven by the plugging lead screw 3 and the rubber cylinder support 16 to go up, the slip 12 can be ejected out of the slip support seat 11 against the binding force of the high-strength spring ring and clamped in the inner wall of the water injection string or the oil production string hanger.

The inner cavity of the lower part of the slip support seat 11 is larger than the outer circles of the upper parts of the slip seat 13 and the rubber cylinder support 16, the outer wall of the lower part 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, so that the rubber cylinder 15 can be conveniently extruded and expanded; the outer circle of the rubber cylinder 15 in the normal state is matched with the outer circle of the slip support seat 11. When the rubber cylinder support 16 drives the rubber cylinder 15 to move upwards and is compressed by the slip support seat 11, the outer circle of the rubber cylinder 15 after being expanded is larger than the outer circle of the tile support seat 11, the inner wall of the hanger can be plugged, and underground overflow is prevented from moving upwards.

The inner circles at two ends of the inner support cylinder 10 are respectively in threaded connection with the packing locking gland 5 and the outer circle of the slip support seat 11; the lower excircle of the plugging screw rod 3 is in threaded connection with the rubber cylinder support 16 and the fixing nut 17. The lower excircle of the plugging screw rod 3 is more convenient to be in threaded connection with the rubber cylinder support 16 and the fixing nut 17, and the rubber cylinder support 16 and the fixing nut 17 can be fixed at the lower part of the plugging screw rod 3 in a welding mode.

A packing installation step is arranged in the upper inner cavity of the inner support cylinder 10, and the packing 9 is installed between the packing installation step and the packing locking gland 5; the outer wall of the upper part of the packing locking gland 5 is provided with a wrench square. The packing 9 can be pressed and compacted by rotating the lower pressing disc to lock the pressing cover 5.

The lower end face of the clamp support outer barrel 7 is provided with a clamp groove, and the clamp groove can be connected with a clamp head at the upper end of a christmas tree of a water injection well or a christmas tree of a self-injection well through a clamp; a supporting outer cylinder sealing ring 8 is arranged in the upper central hole of the clamp supporting outer cylinder 7; the clamp supports the upper portion outer wall of urceolus 7 and still is equipped with supplementary blowdown connector, through supplementary blowdown connector can install supplementary blowdown valve 19. The auxiliary drain valve 19 can drain out liquid leaking from the water injection string hanger or the oil production string hanger into the christmas tree in case the packing element 15 is not tightly sealed.

The bottom hole emptying valve 18 is connected to the upper end of the plugging screw rod 3 through a three-way pipe 2; the upper end of the three-way pipe 2 is also provided with a pressure gauge 1. The bottom hole pressure of the water injection well or the self-injection well can be observed at any time through the pressure gauge 1, and the bottom hole emptying valve 18 connected with the tank truck can be always in an open state without the pressure gauge 1.

A locking gland sealing ring 6 is also 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 a water injection string hanger or a self-injection well oil production string hanger.

The embodiments described above are only exemplary embodiments, but the present utility model is not limited to these embodiments, and modifications may be made by those skilled in the art without departing from the spirit and scope of the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, improvement, etc. made within the spirit and concept of the present utility model should be included in the scope of the present utility model. Therefore, the scope of protection is not limited to the description above.

Claims (10)

1. The blowout prevention plugging device for the maintenance of the christmas tree is characterized by being provided with a plugging lead screw (3), a plugging nut (4), a packing locking gland (5), a clamp supporting outer barrel (7), an inner supporting barrel (10), a slip supporting seat (11) and a rubber barrel (15), wherein:

the rod body of the plugging lead screw (3) is provided with an emptying channel, the upper part of the plugging lead screw (3) is sequentially connected with a bottom hole emptying valve (18), a plugging nut (4) and a packing locking gland (5) from top to bottom in a threaded manner, and the bottom hole emptying valve (18) is connected with a tank car through a pipeline;

the two ends of the inner support cylinder (10) are respectively connected with a packing locking gland (5) and a slip support seat (11), a packing (9) is arranged between the inner support cylinder (10) and the packing locking gland (5), and a slip (12) is arranged in the shell wall of the slip support seat (11);

the lower part of the plugging lead screw (3) is sequentially provided with a fixing nut (17), a rubber cylinder support (16), a spring (14) and a slip seat (13) from bottom to top, and the fixing nut (17) and the rubber cylinder support (16) are connected with the lower part of the plugging lead screw (3);

the rubber cylinder (15) is arranged outside the rubber cylinder support (16) and is positioned below the slip support seat (11);

the outer supporting cylinder (7) is provided with a clamp supporting outer cylinder (10).

2. The blowout prevention and plugging device for the maintenance of the christmas tree according to claim 1, wherein slip teeth and a fixed groove are arranged on the outer side of the slips (12), a displacement chamfer angle is arranged on the lower end of the inner side, and the angle of the displacement chamfer angle is 45 degrees.

3. A blowout prevention and plugging device for christmas tree repair according to claim 2, wherein at least three slips (12) are mounted in the wall of the slip support bowl (11), the slips (12) being fixed in the slip support bowl (11) by means of high-strength spring rings mounted in fixing grooves outside the slips (12).

4. A blowout prevention and plugging device for christmas tree maintenance according to claim 2, characterized in that the upper part of the slip bowl (13) is a cone and the lower part is provided with a spring mounting cavity, the spring (14) being mounted between the spring mounting cavity and the packing element holder (16); the taper of the upper cone of the slip seat (13) is set to be 45 degrees.

5. A blowout prevention and plugging device for the maintenance of a christmas tree according to claim 3, wherein 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 cylinder support (16), the slip support seat (11) is provided with an outer chamfer on the outer wall of the lower part, and the angle of the outer chamfer is set between 35 degrees and 55 degrees, so that the rubber cylinder (15) can be conveniently extruded and expanded; the excircle of the rubber cylinder (15) in a normal state is in line with the excircle of the slip support seat (11).

6. The blowout prevention and plugging device for the maintenance of the christmas tree according to claim 1, wherein the inner circles at the two ends of the inner supporting cylinder (10) are respectively connected with the packing locking gland (5) and the outer circle of the slip supporting seat (11) through threads; the lower excircle of the plugging screw rod (3) is in threaded connection with the rubber cylinder support (16) and the fixing nut (17).

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

8. The blowout prevention and leakage blocking device for the maintenance of the christmas tree according to claim 1, wherein the lower end face of the clamp support outer cylinder (7) is provided with a clamp groove, and the clamp groove can be connected with a clamp head at the upper end of the christmas tree of a water injection well or a self-injection well through a clamp; a supporting outer cylinder sealing ring (8) is arranged in the upper central hole of the clamp supporting outer cylinder (7); the clamp supports the upper portion outer wall of urceolus (7) and still is equipped with supplementary blowdown connector, can install supplementary blowdown valve (19) through supplementary blowdown connector.

9. The blowout prevention and leakage blocking device for the maintenance of the christmas tree according to claim 1, wherein the bottom hole emptying valve (18) is connected to the upper end of the blocking screw rod (3) through a tee pipe (2); the upper end of the three-way pipe (2) is also provided with a pressure gauge (1).

10. The blowout prevention and leakage blocking device for the maintenance of the christmas tree according to claim 7, characterized in that a locking gland sealing ring (6) is also arranged between the packing locking gland (5) and the inner supporting cylinder (10); the outer diameter of the slip support seat (11) is smaller than the inner diameter of a water injection string hanger or a self-injection well oil production string hanger.

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