CN108661592B - Tubing plug - Google Patents

Abstract

The invention discloses an oil pipe plug, and belongs to the field of oil exploitation. This oil pipe plug includes: the device comprises an upper joint, a middle core rod, a fishing head, an outer cylinder, a packer, a sheath, a locking device, an inner blocking head, a piston sleeve and a lower joint; the piston sleeve is internally provided with a sealing ring, the sealing ring divides a cavity formed by the lower joint, the piston and the piston sleeve into a first sealing cavity and a second sealing cavity, the piston positioned in the first sealing cavity is provided with a first liquid inlet hole, the piston positioned in the second sealing cavity is provided with a second liquid inlet hole, and the middle core rod is provided with a third liquid inlet hole. According to the invention, the first liquid inlet hole and the second liquid inlet hole are arranged on the piston, so that the oil pipe plug can be set and unsealed, and the problem of small application range of the oil pipe plug in the prior art is solved. The invention is used for plugging the oil pipe.

Description

Tubing plug

technical field

The invention relates to the field of oil exploitation, in particular to an oil pipe plug.

Background technique

At present, in order to maintain the formation energy and reduce the environmental pollution during the field operation of the oil field, the operation method with pressure is usually adopted. When working under pressure, it is usually necessary to block the oil pipe.

The prior art is to use an oil pipe plug to block the oil pipe before lifting and lowering the oil pipe, so as to ensure the smooth progress of the pressurized operation. In practical applications, when the tubing string is stuck, it is necessary to take out the tubing plug. However, among the currently used tubing plugs, the only ones that can be taken out are the preset tubing plugs, that is, the required and pre- It can be used together with the work cylinder. Once the current tubing plug is put into setting, its own setting force cannot be eliminated, so once it is put into use, it cannot be fished out, and can only be pulled out of the wellbore with the tubing string. Risk of overhaul work.

In the process of realizing the present invention, the inventor found that the prior art has at least the following problems:

Since the position of the preset working cylinder is fixed, the placement position of the oil pipe plug is limited, resulting in a relatively small range of use of the oil pipe plug, so the applicability of the current oil pipe plug is low.

SUMMARY OF THE INVENTION

In order to solve the problem that the use range of the oil pipe plug in the prior art is relatively small, the present invention provides an oil pipe plug. The technical solution is as follows:

An oil pipe plug is provided, comprising:

Upper joint, center core rod, salvage head, outer cylinder, packer, sheath, locking device, inner stop head, piston, piston sleeve and lower joint;

One end of the core rod is connected with the upper joint, the fishing head, the outer cylinder, the piston and the lower joint are connected in sequence, and the outer cylinder is sleeved on the core rod, so the The packer and the sheath are sequentially sleeved on the outer cylinder, the locking device is arranged in the cavity formed by the outer cylinder and the sheath, and the inner stop head is located at the piston in the cavity formed with the core rod;

The packer includes: a pressure plate, when the pressure plate is clamped with the outer cylinder, resistance is generated to the coupling gap of the oil pipe, so that the pressure plate is clamped in the coupling gap of the oil pipe;

The piston sleeve is provided with a sealing ring, and the sealing ring divides the cavity formed by the lower joint, the piston and the piston sleeve into a first sealing cavity and a second sealing cavity. The piston in a sealed cavity is provided with a first liquid inlet hole, the piston in the second sealed cavity is provided with a second liquid inlet hole, and the middle core rod is provided with a third liquid inlet hole;

Sealing structures are provided on both sides of the first liquid inlet hole, the second liquid inlet hole and the third liquid inlet hole;

The salvage head and the core rod are connected by the first hand-dropping scissors, the piston sleeve and the lower joint are connected by the second hand-dropping scissors, and the packer and the outer cylinder are connected by the first hand-dropping scissors. The unsealing scissors are connected, the inner stop head and the core rod are connected by the second unsealing scissors, and the locking device and the sheath are connected by the third unsealing scissors;

Wherein, when the upper joint is pulled, the first throwaway scissors are cut, and the first sealed cavity enters the liquid through the first liquid inlet hole, so that the second throwaway scissors are in The piston sleeve is sheared under the action of pressure, and the piston sleeve produces a force on the sheath, the locking device and the packer, so that the packer can seal the space between the outer cylinder and the oil pipe. When the locking device is locked, the setting is completed;

When the fishing head is pulled up, the first unsealing shears and the third unsealing shears are cut, the outer cylinder moves, the locking device is unlocked, and the pressure plate and the outer When the upper joint is pulled up, the second unsealing shear nail is cut off, and the second liquid inlet hole is connected to the The third liquid inlet hole is connected, the second sealing cavity enters the liquid, and the packer releases the sealing of the space between the outer cylinder and the oil pipe, and completes the unsealing.

Optionally, the locking device includes: inverted teeth set at a preset position of the outer cylinder, and a fixing ring, a locking ring and a stop ring set between the sheath and the outer cylinder, the The fixing ring, the locking ring and the retaining ring are sleeved on the outer cylinder in sequence, the locking ring is used for cooperating and fixing with the inverted teeth when the oil pipe plug is set, and the fixing ring and the The sheath is connected by the third unsealing scissors.

Optionally, the packer includes: a slip seat, a slip, a cone and a sealing assembly, and the slip seat, the slip, the cone and the sealing assembly are sequentially sleeved at the place. on the outer cylinder,

the slip seat and the outer cylinder are connected by the first unsealing shears;

One end of the slip is connected with the slip seat, and the other end of the slip is connected with the cone;

The slip seat is provided with n pressure plate grooves, each pressure plate groove is provided with the pressure plate and a pin matched with the pressure plate, and the pressure plate can rotate on the pin;

The n is a positive integer, and 2≤n≤4.

Optionally, the sealing assembly includes: a plurality of sealing cylinders,

A spacer ring is arranged between every two of the sealing cylinders.

Optionally, the sealing assembly includes: a sealing barrel.

Optionally, the sealing assembly further includes: a wedge block and an elastic claw, and the wedge block and the elastic claw are sleeved on the outer cylinder.

Optionally, the multiple sealing cylinders are two sealing cylinders.

Optionally, the sealing cylinder is a rubber cylinder.

Optionally, the slip seat is provided with m slip holes, the packer includes m slips, one end of each slip is connected to the slip seat through the slip hole, and the m is greater than or equal to 2.

Optionally, the m is equal to 3.

The beneficial effects brought by the technical scheme provided by the invention are:

By arranging the first liquid inlet hole and the second liquid inlet hole on the piston, when the liquid enters the first sealing cavity from the first liquid inlet hole, a pressure difference is formed between the first sealing cavity and the second sealing cavity, and the oil pipe is blocked. When the liquid enters the second sealing cavity from the second liquid inlet hole, the pressure difference between the first sealing cavity and the second sealing cavity disappears, and the oil pipe plug is unsealed. In the case of the working cylinder, the setting and unsealing of the oil pipe plug can be realized, and when the unsealing is completed, the oil pipe plug can be salvaged from the oil pipe, which effectively increases the use of the oil pipe plug. range, improving the applicability of the tubing plug.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

1-1 is a schematic structural diagram of the upper part of an oil pipe plug provided by an embodiment of the present invention;

1-2 is a schematic structural diagram of a lower part of an oil pipe plug provided by an embodiment of the present invention;

1-3 are a partial enlarged view of the tubing plug provided by the embodiment of the present invention at position A;

Figures 1-4 are partial enlarged views of the tubing plug provided by the embodiment of the present invention at B;

Figures 1-5 are partial enlarged views of the tubing plug provided by the embodiment of the present invention at position C;

Figures 1-6 are partial enlarged views of the tubing plug provided at D in an embodiment of the present invention;

Figures 1-7 are partial enlarged views of the tubing plug provided at E at an embodiment of the present invention;

Fig. 2-1 is a perspective view of an oil pipe plug provided by an embodiment of the present invention;

2-2 is a perspective view of a lower end of an oil pipe plug provided by an embodiment of the present invention.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

An embodiment of the present invention provides an oil pipe plug, as shown in Figures 1-1 and 1-2, Figure 1-1 is a schematic structural diagram of the upper part of an oil pipe plug provided by an embodiment of the present invention, Figure 1- 2 is a schematic structural diagram of the lower part of an oil pipe plug provided by an embodiment of the present invention. The tubing plug may include:

The upper joint 10 , the core rod 20 , the fishing head 30 , the outer cylinder 40 , the packer 50 , the sheath 61 , the locking device 62 , the inner stop head 71 , the piston 72 , the piston sleeve 73 and the lower joint 80 .

One end of the core rod 20 is threadedly connected with the upper joint 10, the salvage head 30, the outer cylinder 40, the piston 72, and the lower joint 80 are connected in sequence through threads, the outer cylinder 40 is sleeved on the core rod 20, and the outer cylinder 40 is sequentially connected The packer 50 and the sheath 61 are socketed. The locking device 62 is disposed in the cavity formed by the outer cylinder 40 and the sheath 61 , and the inner stop head 71 is located in the cavity formed by the piston 72 and the center rod 20 .

The packer 50 may include: a pressure plate 511a, when the pressure plate 511a is clamped with the stepped structure in the outer cylinder 40, resistance is generated to the coupling gap of the oil pipe, so that the pressure plate 511a is stuck in the coupling gap of the oil pipe.

The piston sleeve 73 is provided with a sealing ring 731. The sealing ring 731 divides the cavity formed by the lower joint 80, the piston 72 and the piston sleeve 73 into a first sealing cavity 731a and a second sealing cavity 731b, which are located in the first sealing cavity. The piston 72 in 731a is provided with a first liquid inlet hole 721, the piston 72 in the second sealing cavity 731b is provided with a second liquid inlet hole 722, and the center rod 20 is provided with a third liquid inlet hole 21. Sealing structures 7311 are provided on both sides of the first liquid inlet hole 721 , the second liquid inlet hole 722 and the third liquid inlet hole 21 . The sealing structure 7311 and the sealing ring 731 can have the same structure and can prevent liquid from entering the first seal. The cavity 731a or the second sealed cavity 731b. In order to more clearly show the relative positions of the piston 72 and the liquid inlet hole on the center rod 20, the embodiment of the present invention provides a partial enlarged view of the oil pipe plug at positions A and B, please refer to Figures 1-3 and 1-4, Fig. 1-3 is a partial enlarged view of the oil pipe plug provided by the embodiment of the present invention at A, Fig. 1-4 is a partial enlarged view of the oil pipe plug provided by the embodiment of the present invention at B, the Figs. 1-3 and For specific reference numerals in Figs. 1-4, reference may be made to Figs. 1-2, and details are not described here.

The salvage head 30 and the core rod 20 are connected by the first scissors 011, the piston sleeve 72 and the lower joint 80 are connected by the second scissors 012, the packer 50 and the outer cylinder 40 are connected by the first unsealing scissors 021 is connected, the inner stop head 71 and the core rod 20 are connected by the second unsealing scissors 022 , and the locking device 62 and the sheath 61 are connected by the third unsealing scissors 023 .

Wherein, when the upper joint 10 is pulled up, the first hand-disposable scissors 011 are cut off, the first sealing cavity 731a enters the liquid through the first liquid inlet hole 721, and the first sealing cavity 731a and the second sealing cavity 731b are formed The pressure difference causes the second hand-throwing scissors 012 to be cut off under the action of pressure, and the piston 72 sets the sheath 61, the locking device 62 and the packer 50 to exert a force, which can make the packer 50 seal the outer cylinder 40 and the packer 50. The space between the oil pipes is set when the locking device 62 is locked.

When the fishing head 30 is pulled up, the first unsealing scissors 021 and the third unsealing scissors 023 are cut, the outer cylinder 40 is moved, the locking device 62 is unlocked, and the pressing plate 511a is released from the stepped structure in the outer cylinder 40. After the resistance of the pressure plate 511a to the coupling gap of the oil pipe disappears, when the upper joint 10 is pulled up, the second unsealing scissors 022 are cut off, the second liquid inlet hole 722 is communicated with the third liquid inlet hole 21, the second The sealing cavity 731b enters the liquid, the pressure difference between the first sealing cavity 731a and the second sealing cavity 731b disappears, the force of the piston 72 on the sheath 61, the locking device 62 and the packer 50 disappears, and the packer 50 disappears. The sealing of the space between the outer cylinder 40 and the oil pipe is released, and the unsealing is completed.

To sum up, in the oil pipe plug provided by the embodiment of the present invention, by arranging the first liquid inlet hole and the second liquid inlet hole on the piston, when the liquid enters the first sealing cavity from the first liquid inlet hole, the first liquid inlet The pressure difference between the sealing cavity and the second sealing cavity is formed, and the oil pipe plug completes the setting. When the liquid enters the second sealing cavity from the second liquid inlet hole, the pressure formed by the first sealing cavity and the second sealing cavity is The difference disappears, the oil pipe plug is unsealed, and the setting and unsealing of the oil pipe plug can be realized without the need of a preset working cylinder, and when the unsealing is completed, the oil pipe plug can be removed from the oil pipe. It can effectively increase the use range of the oil pipe plug and improve the applicability of the oil pipe plug.

Optionally, please refer to FIG. 1-1, the packer 50 may include: slip seat 51, slip 52, cone 53 and sealing assembly 54, slip seat 51, slip 52, cone 53 and sealing assembly 54 is sequentially sleeved on the outer cylinder 40 .

There are n pressing plate grooves 511 on the slip seat 51 , where n is a positive integer and 2≤n≤4. Each pressing plate groove 511 is provided with a pressing plate 511a and a pin 511b. The plurality of pressing plates 511a are evenly distributed in the radial direction of the slip seat 51. 511a can be rotated about pin 511b. When the oil pipe plug is blocking the oil pipe, at this time, one end of the pressure plate 511a is clamped with the stepped structure in the outer cylinder 40, and the other end of the pressure plate 511a produces resistance to the coupling gap of the oil pipe, so that the pressure plate 511a is stuck in the coupling gap of the oil pipe. middle. In order to more clearly show the positional relationship of the pressure plate 511a in the pressure plate groove 511, the embodiment of the present invention provides a partial enlarged view of the oil pipe plug at C, please refer to FIG. 1-5, which is the oil pipe provided by the embodiment of the present invention. A partial enlarged view of the occluder at C, the specific reference numerals in Figs. 1-5 can be referred to Fig. 1-1, which will not be repeated here.

There are also m slip holes 512 on the slip seat 51 , m is a positive integer, and m≧2, preferably, m=3, that is, three slip holes 512 are arranged on the slip seat 51 . One end of each slip 52 is connected to the slip seat 51 through the slip hole 512 , that is, each slip hole 512 is connected with a slip 52 , and the three slips 52 are evenly distributed in the radial direction of the outer cylinder 40 , the other end of the slip 52 is connected to the cone 53, and the cone 53 is provided with a slip groove matched with the slip 52. When the oil pipe plug is blocked, the slip 53 moves on the slip groove, so that The slips 53 can exert force on the inner wall of the oil pipe. In practical applications, a hoop spring 521 is also provided on the slip 52 , and the hoop spring 521 can limit and fix the slip 52 .

In the embodiment of the present invention, the sealing assembly may include: at least one sealing cylinder, a wedge block and an elastic claw, and the at least one sealing cylinder may be a rubber cylinder. When the seal includes a rubber cylinder, one end of the rubber cylinder is provided with elastic claws and wedges which are sequentially sleeved on the outer cylinder, and the other end of the rubber cylinder is provided with wedges and elastic claws which are sequentially sleeved on the outer cylinder. When the sealing member includes a plurality of rubber barrels, a spacer ring is arranged between every two rubber barrels. Preferably, as shown in FIG. 1-1 , the sealing assembly 54 includes: two rubber cylinders 541 , and a spacer 544 is provided between the two rubber cylinders 541 , and one end of one rubber cylinder 541 is provided with a sleeve sleeved on the outside in sequence. The elastic claw 542 and the wedge 543 on the cylinder 40 are provided with the wedge 543 and the elastic claw 542 sequentially sleeved on the outer cylinder 40 at one end of the other rubber cylinder 541 . When the oil pipe plug is set, the two rubber cylinders 541 are compressed in the axial direction and expanded in the radial direction, at this time, the sealing assembly 54 can seal the space between the outer cylinder 40 and the oil pipe.

Optionally, as shown in FIGS. 1-2 , the locking device 62 may include: inverted teeth 621 provided at preset positions of the outer cylinder 40 , and a fixing ring 622 and a locking ring provided between the sheath 61 and the outer cylinder 40 623 and the retaining ring 624, wherein the fixing ring 622, the locking ring 623 and the retaining ring 624 are sleeved on the outer cylinder 40 in sequence, the locking ring 624 is used to cooperate and fix with the inverted tooth 621 when the tubing plug is set, and the fixing ring 623 is The sheath 61 is connected by the third unsealing scissors 023 . In order to show the structure of the locking device 62 more clearly, the embodiment of the present invention provides a partial enlarged view of the oil pipe plug at positions D and E. Please refer to FIGS. 1-6 and 1-7, and FIG. 1-6 is the present invention. A partial enlarged view of the oil pipe plug provided by the embodiment at D, FIGS. 1-7 are a partial enlarged view of the oil pipe plug provided by the embodiment of the present invention at E, the specific details in FIGS. 1-6 and 1-7 Reference numerals can be referred to Figs. 1-2 and will not be repeated here.

In the embodiment of the present invention, in order to more clearly represent the positional relationship of each component in the tubing plug, the embodiment of the present invention provides a three-dimensional view of the tubing plug, as shown in Figure 2-1 and Figure 2-2, Figure 2-1 It is a perspective view of an oil pipe plug provided by an embodiment of the present invention. Figure 2-2 is a perspective view of the lower end of an oil pipe plug provided by an embodiment of the present invention. The specific drawings in Figure 2-1 and Figure 2-2 For labels, refer to Figure 1-1 or Figure 1-2, and details are not described here.

The working principle of the tubing blocker provided by the embodiment of the present invention is as follows:

When setting, one end of the pressure plate 511a is clamped with the stepped structure in the outer cylinder 40, and the other end of the pressure plate 511a produces resistance to the coupling gap of the oil pipe, so that the pressure plate 511a is stuck in the coupling gap of the oil pipe. At this time, the oil pipe plug is blocked. It is fixed on the oil pipe; when the upper joint 10 is pulled up, the first scissors 011 are cut off, the core rod 20 moves upward, and when the sealing effect of the sealing structure 7311 on the first liquid inlet hole 721 disappears, the first sealing The cavity 731a enters the liquid through the first liquid inlet hole 721. Under the action of the liquid, the first sealing cavity 731a generates hydrostatic pressure on the sealing ring 731, so that the first sealing cavity 731a and the second sealing cavity 731b form a pressure difference , so that the second hand scissors 012 is cut off under the action of the pressure difference, the piston sleeve 72 moves upward, and drives the sheath 61 and the stop ring 624 to move upward, while the sheath 61 moves upward, the two rubber cylinders 541 compresses in the axial direction and expands in the radial direction, and the slips 52 move in the direction of the slip groove, so that the two rubber cylinders 541 can seal the space between the outer cylinder 40 and the oil pipe, and the slips 53 can seal the inner wall of the oil pipe. A force is generated; when the lock ring 623 moves to the position of the inverted tooth 621 and is fixed with the inverted tooth 621 , the setting of the oil pipe plug is completed.

When unsealing, the salvage head 30 is pulled up, the first unsealing scissors 021 and the third unsealing scissors 023 are cut off, and the outer cylinder 40 is moved to release the clamping plate 511a from the stepped structure in the outer cylinder 40. The resistance to the coupling gap of the oil pipe disappears, and the force of the lock ring 623 and the inverted tooth 621 disappears; then the joint 10 is pulled up, so that the second unsealing scissors 022 are cut off. When the sealing structure 7311 enters the second liquid When the sealing effect of the hole 722 disappears, the second liquid inlet hole 722 communicates with the third liquid inlet hole 21, the second sealing cavity 731b enters the liquid, the pressure difference between the first sealing cavity 731a and the second sealing cavity 731b disappears, and the piston The force of the sleeve 72 on the sheath 61 disappears, so that the two sealing cylinders 541 are compressed in the radial direction and stretched in the axial direction, and the slips 52 move in the direction of the slip grooves, so that the two rubber cylinders 541 do not The space between the outer cylinder 40 and the oil pipe is resealed, and at the same time, the slips 53 no longer exert any force on the inner wall of the oil pipe, and the unsealing is completed. At this time, the oil pipe fisher can be salvaged from the oil pipe.

To sum up, in the oil pipe plug provided by the embodiment of the present invention, by arranging the first liquid inlet hole and the second liquid inlet hole on the piston, when the liquid enters the first sealing cavity from the first liquid inlet hole, the first liquid inlet The pressure difference between the sealing cavity and the second sealing cavity is formed, and the oil pipe plug completes the setting. When the liquid enters the second sealing cavity from the second liquid inlet hole, the pressure formed by the first sealing cavity and the second sealing cavity is The difference disappears, the oil pipe plug is unsealed, and the setting and unsealing of the oil pipe plug can be realized without the need of a preset working cylinder, and when the unsealing is completed, the oil pipe plug can be removed from the oil pipe. It can effectively increase the use range of the oil pipe plug and improve the applicability of the oil pipe plug.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

Claims (10)

1. An oil pipe plug, comprising:

the device comprises an upper joint, a middle core rod, a fishing head, an outer cylinder, a packer, a sheath, a locking device, an inner blocking head, a piston sleeve and a lower joint;

one end of the middle core rod is connected with the upper connector, the fishing head, the outer cylinder, the piston and the lower connector are sequentially connected, the outer cylinder is sleeved on the middle core rod, the packer and the sheath are sequentially sleeved on the outer cylinder, the locking device is arranged in a cavity formed by the outer cylinder and the sheath, and the inner gear head is positioned in the cavity formed by the piston and the middle core rod;

the packer includes: the pressing plate generates resistance to a coupling gap of the oil pipe when clamped with the outer cylinder, so that the pressing plate is clamped in the coupling gap of the oil pipe;

a sealing ring is arranged in the piston sleeve, the sealing ring divides a cavity formed by the lower joint, the piston and the piston sleeve into a first sealing cavity and a second sealing cavity, a first liquid inlet hole is formed in the piston positioned in the first sealing cavity, a second liquid inlet hole is formed in the piston positioned in the second sealing cavity, and a third liquid inlet hole is formed in the middle core rod;

sealing structures are arranged on two sides of the first liquid inlet hole, the second liquid inlet hole and the third liquid inlet hole;

the fishing head is connected with the central core rod through a first releasing shear pin, the piston sleeve is connected with the lower joint through a second releasing shear pin, the packer is connected with the outer cylinder through a first deblocking shear pin, the inner gear head is connected with the central core rod through a second deblocking shear pin, and the locking device is connected with the sheath through a third deblocking shear pin;

when the upper joint is pulled, the first releasing shear pin is sheared, the first sealing cavity enters liquid through the first liquid inlet hole, the second releasing shear pin is sheared under the action of pressure, the piston sleeve generates acting force on the sheath, the locking device and the packer, the packer can seal a space between the outer cylinder and an oil pipe, and setting is finished when the locking device is locked;

when the fishing head is pulled, the first deblocking shear pin and the third deblocking shear pin are sheared, the outer barrel moves, the locking device is unlocked, the pressing plate and the outer barrel are unlocked, after resistance of the pressing plate to a coupling gap of the oil pipe disappears, when the upper joint is pulled, the second deblocking shear pin is sheared, the second liquid inlet hole is communicated with the third liquid inlet hole, liquid enters the second sealing cavity, and the packer removes sealing of a space between the outer barrel and the oil pipe, so that deblocking is completed.

2. Tubing plug according to claim 1,

the locking device includes: the oil pipe plug is characterized by comprising inverted teeth arranged at a preset position of the outer barrel, and a fixing ring, a locking ring and a blocking ring which are arranged between the sheath and the outer barrel, wherein the fixing ring, the locking ring and the blocking ring are sequentially sleeved on the outer barrel, the locking ring is used for being matched and fixed with the inverted teeth when the oil pipe plug is set, and the fixing ring is connected with the sheath through a third deblocking shear pin.

3. Tubing plug according to claim 1,

the packer comprises: the slip seat, the slip, the cone and the sealing component are sequentially sleeved on the outer barrel,

the slip seat is connected with the outer cylinder through the first deblocking shear pin;

one end of the slip is connected with the slip seat, and the other end of the slip is connected with the cone;

the slip seat is provided with n pressing plate grooves, each pressing plate groove is provided with a pressing plate and a pin matched with the pressing plate, and the pressing plates can rotate on the pins;

n is a positive integer and is more than or equal to 2 and less than or equal to 4.

4. Tubing plug according to claim 3,

the seal assembly includes: a plurality of sealing cylinders are arranged in the sealing cylinder,

and a spacer ring is arranged between every two sealing cylinders.

5. Tubing plug according to claim 3,

the seal assembly includes: a sealed canister.

6. Tubing plug according to claim 4 or 5,

the seal assembly further comprises: the wedge block and the elastic claw are sleeved on the outer cylinder.

7. Tubing plug according to claim 4,

the plurality of sealing barrels are two sealing barrels.

8. Tubing plug according to claim 4, 5 or 7,

the sealing cylinder is a rubber cylinder.

9. The tubing plug as claimed in claim 3 wherein the slip bowl is provided with m slip bores, the packer comprising: one end of each slip is connected with the slip seat through a slip hole, and m is larger than or equal to 2.

10. Tubing plug according to claim 9, wherein m is equal to 3.

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