CN108661592B - Oil pipe plug - Google Patents

Oil pipe plug Download PDF

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Publication number
CN108661592B
CN108661592B CN201710194060.5A CN201710194060A CN108661592B CN 108661592 B CN108661592 B CN 108661592B CN 201710194060 A CN201710194060 A CN 201710194060A CN 108661592 B CN108661592 B CN 108661592B
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CN
China
Prior art keywords
oil pipe
sealing
liquid inlet
inlet hole
shear pin
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Active
Application number
CN201710194060.5A
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Chinese (zh)
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CN108661592A (en
Inventor
韩新德
林春庆
谢唯一
王少波
冮明超
季博卿
刘怀庆
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Petrochina Co Ltd
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Petrochina Co Ltd
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Priority to CN201710194060.5A priority Critical patent/CN108661592B/en
Publication of CN108661592A publication Critical patent/CN108661592A/en
Application granted granted Critical
Publication of CN108661592B publication Critical patent/CN108661592B/en
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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00Sealing or packing boreholes or wells
    • E21B33/10Sealing or packing boreholes or wells in the borehole
    • E21B33/12Packers; Plugs
    • E21B33/1208Packers; Plugs characterised by the construction of the sealing or packing means

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

Oil pipe plug
Technical Field
The invention relates to the field of oil exploitation, in particular to an oil pipe plug.
Background
At present, when the operation is carried out on the oil field site, in order to keep the stratum energy and reduce the environmental pollution, the operation mode with pressure is usually adopted. When operating under pressure, it is often necessary to plug the tubing.
In the prior art, an oil pipe is plugged by an oil pipe plugging device before the oil pipe is pulled out and put down, so that the smooth operation under pressure is ensured. In practical application, when a pipe column is clamped and the like, the oil pipe plug needs to be taken out, and the oil pipe plug used at present can be a preset oil pipe plug which is taken out, namely the oil pipe plug needs to be matched with a preset working barrel for use. Because the setting force of the existing oil pipe blanking plug cannot be eliminated once the existing oil pipe blanking plug is put into setting, the existing oil pipe blanking plug cannot be fished out once the existing oil pipe blanking plug is put into use, and only can be pulled out of a shaft along with a pipe column, and once the pipe column is blocked and cannot be pulled out, the risk that a well is about to be overhauled exists.
In the process of implementing the invention, the inventor finds that the prior art has at least the following problems:
the preset working barrel is fixed in position, so that the throwing position of the oil pipe plug is limited, the application range of the oil pipe plug is smaller, and the applicability of the existing oil pipe plug is lower.
Disclosure of Invention
The invention provides an oil pipe plug, aiming at solving the problem that the application range of the oil pipe plug in the prior art is smaller. The technical scheme is as follows:
provided is a tubing 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.
Optionally, 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.
Optionally, 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.
Optionally, the seal assembly comprises: a plurality of sealing cylinders are arranged in the sealing cylinder,
and a spacer ring is arranged between every two sealing cylinders.
Optionally, the seal assembly comprises: a sealed canister.
Optionally, the sealing assembly further comprises: the wedge block and the elastic claw are sleeved on the outer cylinder.
Optionally, the plurality of sealing cylinders are two sealing cylinders.
Optionally, the sealing cylinder is a rubber cylinder.
Optionally, be provided with m slips hole on the slip bowl, the packer includes: one end of each slip is connected with the slip seat through a slip hole, and m is larger than or equal to 2.
Optionally, m is equal to 3.
The technical scheme provided by the invention has the beneficial effects that:
through setting up first feed liquor hole and second feed liquor hole on the piston, when liquid got into first seal chamber from first feed liquor hole, first seal chamber and second seal chamber formed the pressure difference, the setting is accomplished to the oil pipe blanking plug, when liquid got into second seal chamber from the second feed liquor hole, the pressure difference that first seal chamber and second seal chamber formed disappeared, the deblocking is accomplished to the oil pipe blanking plug, under the condition that does not need preset working barrel, alright with the setting and the deblocking that realize the oil pipe blanking plug, and when the deblocking was accomplished, can salvage out from oil pipe with this oil pipe blanking plug, the effectual application range who increases this oil pipe blanking plug, the suitability of oil pipe blanking plug has been improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1-1 is a schematic structural view of an upper portion of a tubing plug according to an embodiment of the present invention;
FIGS. 1-2 are schematic structural views of a lower portion of a tubing plug according to embodiments of the present invention;
FIGS. 1-3 are enlarged partial views of a tubing plug at A according to embodiments of the present invention;
FIGS. 1-4 are enlarged partial views of a tubing plug at B according to embodiments of the present invention;
FIGS. 1-5 are enlarged partial views of a tubing plug at C provided in accordance with an embodiment of the present invention;
FIGS. 1-6 are enlarged partial views of a tubing plug at D according to an embodiment of the present invention;
FIGS. 1-7 are enlarged partial views of a tubing plug at E according to embodiments of the present invention;
FIG. 2-1 is a perspective view of a tubing plug according to an embodiment of the present invention;
fig. 2-2 is a perspective view of the lower end of a tubing plug according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
An embodiment of the present invention provides an oil pipe plug, as shown in fig. 1-1 and fig. 1-2, fig. 1-1 is a schematic structural view of an upper portion of the oil pipe plug provided in the embodiment of the present invention, and fig. 1-2 is a schematic structural view of a lower portion of the oil pipe plug provided in the embodiment of the present invention. The tubing plug may include:
the upper joint 10, the central core rod 20, the fishing head 30, the outer cylinder 40, the packer 50, the sheath 61, the locking device 62, the inner gear 71, the piston 72, the piston sleeve 73 and the lower joint 80.
One end of the middle core rod 20 is in threaded connection with the upper connector 10, the fishing head 30, the outer cylinder 40, the piston 72 and the lower connector 80 are sequentially connected through threads, the outer cylinder 40 is sleeved on the middle core rod 20, and the outer cylinder 40 is sequentially sleeved with the packer 50 and the sheath 61. The locking device 62 is disposed in a cavity formed by the outer cylinder 40 and the sheath 61, and the inner stop 71 is disposed in a cavity formed by the piston 72 and the central core rod 20.
The packer 50 may include: the pressing plate 511a generates resistance to the coupling gap of the tubing when the pressing plate 511a is engaged with the step structure in the outer cylinder 40, so that the pressing plate 511a is engaged in the coupling gap of the tubing.
A sealing ring 731 is arranged in the piston sleeve 73, the sealing ring 731 divides a cavity formed by the lower joint 80, the piston 72 and the piston sleeve 73 into a first sealed cavity 731a and a second sealed cavity 731b, a first liquid inlet hole 721 is arranged on the piston 72 positioned in the first sealed cavity 731a, a second liquid inlet hole 722 is arranged on the piston 72 positioned in the second sealed cavity 731b, and a third liquid inlet hole 21 is arranged on the central core rod 20. Sealing structures 7311 are disposed on two sides of the first liquid inlet 721, the second liquid inlet 722, and the third liquid inlet 21, and the sealing structures 7311 and the sealing ring 731 may have the same structure, so as to block liquid from entering the first sealing cavity 731a or the second sealing cavity 731 b. In order to more clearly show the relative positions of the piston 72 and the fluid inlet on the central core rod 20, the embodiment of the present invention provides a partially enlarged view of the tubing plug at positions a and B, please refer to fig. 1-3 and fig. 1-4, fig. 1-3 are partially enlarged views of the tubing plug at position a provided by the embodiment of the present invention, fig. 1-4 are partially enlarged views of the tubing plug at position B provided by the embodiment of the present invention, and specific reference numerals in fig. 1-3 and fig. 1-4 may refer to fig. 1-2, which is not repeated herein.
Salvage head 30 and well core rod 20 and be connected through first releasing shear pin 011, piston sleeve 72 is connected through second releasing shear pin 012 with lower clutch 80, and packer 50 is connected through first deblocking shear pin 021 with urceolus 40, and interior shelves head 71 is connected through second deblocking shear pin 022 with well core rod 20, and locking device 62 is connected through third deblocking shear pin 023 with sheath 61.
When the upper joint 10 is lifted, the first releasing shear pin 011 is sheared, the first sealing cavity 731a enters liquid through the first liquid inlet hole 721, pressure difference is formed between the first sealing cavity 731a and the second sealing cavity 731b, the second releasing shear pin 012 is sheared under the action of pressure, the piston 72 generates acting force on the sheath 61, the locking device 62 and the packer 50, the packer 50 can seal the space between the outer cylinder 40 and the oil pipe, and setting is completed when the locking device 62 is locked.
When the fishing head 30 is pulled, the first unsealing shear pin 021 and the third unsealing shear pin 023 are sheared, the outer cylinder 40 moves, the locking device 62 is unlocked, the pressing plate 511a is enabled to be disengaged from the step structure in the outer cylinder 40, after the resistance of the pressing plate 511a to a coupling gap of an oil pipe disappears, when the upper joint 10 is pulled, the second unsealing shear pin 022 is sheared, the second liquid inlet hole 722 is communicated with the third liquid inlet hole 21, the second sealed cavity 731b enters liquid, the pressure difference between the first sealed cavity 731a and the second sealed cavity 731b disappears, the acting force of the piston 72 on the sheath 61, the locking device 62 and the packer 50 disappears, the packer 50 removes the sealing of the space between the outer cylinder 40 and the oil pipe, and the unsealing is completed.
In summary, according to the oil pipe plug provided by the embodiment of the invention, the first liquid inlet hole and the second liquid inlet hole are arranged on the piston, when liquid enters the first sealed cavity from the first liquid inlet hole, a pressure difference is formed between the first sealed cavity and the second sealed cavity, the oil pipe plug completes setting, when liquid enters the second sealed cavity from the second liquid inlet hole, the pressure difference formed between the first sealed cavity and the second sealed cavity disappears, the oil pipe plug completes unsealing, the setting and unsealing of the oil pipe plug can be realized without a preset working cylinder, and the oil pipe plug can be fished out from an oil pipe when the unsealing is completed, so that the use range of the oil pipe plug is effectively enlarged, and the applicability of the oil pipe plug is improved.
Alternatively, referring to fig. 1-1, the packer 50 may comprise: the slip bowl 51, the slips 52, the cone 53 and the sealing assembly 54 are sequentially sleeved on the outer barrel 40.
N pressure plate grooves 511 are arranged on the slip seat 51, wherein n is a positive integer and is more than or equal to 2 and less than or equal to 4. Each of the pressing plate slots 511 is provided with a pressing plate 511a and a pin 511b, the pressing plates 511a are uniformly distributed in the radial direction of the slip seat 51, the pressing plate 511a is provided with a pin hole 511c matched with the pin 511b, and the pressing plate 511a can rotate around the pin 511 b. When the tubing plug plugs the tubing, one end of the pressure plate 511a is clamped with the step structure in the outer cylinder 40, and the other end of the pressure plate 511a generates resistance to the coupling gap of the tubing, so that the pressure plate 511a is clamped in the coupling gap of the tubing. In order to more clearly show the position relationship of the pressure plate 511a in the pressure plate slot 511, the embodiment of the present invention provides a partially enlarged view of the oil pipe plug at position C, please refer to fig. 1 to 5, where fig. 1 to 5 are partially enlarged views of the oil pipe plug at position C provided by the embodiment of the present invention, and specific reference numerals in fig. 1 to 5 may refer to fig. 1 to 1, which are not repeated herein.
The slip bowl 51 is further provided with m slip holes 512, m is a positive integer and m is greater than or equal to 2, preferably, m is 3, that is, the slip bowl 51 is provided with three slip holes 512. One end of each slip 52 is connected with the slip seat 51 through a slip hole 512, that is, each slip hole 512 is connected with a slip 52, the three slips 52 are uniformly distributed in the radial direction of the outer cylinder 40, the other end of each slip 52 is connected with a cone 53, a slip groove matched with the slip 52 is arranged on the cone 53, and when the tubing plug is plugged and set, the slip 53 moves on the slip groove, so that the slip 53 can generate acting force on the inner wall of the tubing. In practical application, a hoop spring 521 is further disposed on the slips 52, and the hoop spring 521 can perform a limiting and fixing function on the slips 52.
In an embodiment of the present invention, the sealing assembly may include: at least one sealing cylinder, and wedge and elastic claw, this at least one sealing cylinder can be the packing element all. When the sealing element comprises a rubber cylinder, one end of the rubber cylinder is provided with an elastic claw and a wedge block which are sequentially sleeved on the outer cylinder, and the other end of the rubber cylinder is provided with a wedge block and an elastic claw which are sequentially sleeved on the outer cylinder. When the sealing element comprises a plurality of rubber cylinders, a spacer ring is arranged between every two rubber cylinders. Preferably, as shown in fig. 1-1, the seal assembly 54 comprises: two rubber cylinders 541, a spacer ring 544 is disposed between the two rubber cylinders 541, one end of one of the rubber cylinders 541 is provided with an elastic claw 542 and a wedge 543 sequentially sleeved on the outer cylinder 40, and one end of the other rubber cylinder 541 is provided with a wedge 543 and an elastic claw 542 sequentially sleeved on the outer cylinder 40. When the tubing plug is set, the two glue cartridges 541 are compressed axially and expand radially, allowing the seal assembly 54 to seal the space between the outer cartridge 40 and the tubing.
Alternatively, as shown in fig. 1-2, the locking device 62 may include: the oil pipe plug setting device comprises inverted teeth 621 arranged at a preset position of an outer barrel 40, and a fixing ring 622, a locking ring 623 and a blocking ring 624 arranged between a sheath 61 and the outer barrel 40, wherein the fixing ring 622, the locking ring 623 and the blocking ring 624 are sequentially sleeved on the outer barrel 40, the locking ring 624 is matched and fixed with the inverted teeth 621 when the oil pipe plug is set, and the fixing ring 623 is connected with the sheath 61 through a third unsealing shear pin 023. In order to more clearly show the structure of the locking device 62, a partial enlarged view of the tubing plug at positions D and E is provided in the embodiment of the present invention, please refer to fig. 1 to 6 and fig. 1 to 7, fig. 1 to 6 are partial enlarged views of the tubing plug at position D provided in the embodiment of the present invention, fig. 1 to 7 are partial enlarged views of the tubing plug at position E provided in the embodiment of the present invention, and specific reference numerals in fig. 1 to 6 and fig. 1 to 7 may refer to fig. 1 to 2, which are not repeated herein.
In the embodiment of the present invention, in order to more clearly show the position relationship of each component in the oil pipe plug, an embodiment of the present invention provides a perspective view of the oil pipe plug, as shown in fig. 2-1 and fig. 2-2, fig. 2-1 is a perspective view of an oil pipe plug provided in the embodiment of the present invention, fig. 2-2 is a perspective view of a lower end of an oil pipe plug provided in the embodiment of the present invention, and specific reference numerals in fig. 2-1 and fig. 2-2 may refer to fig. 1-1 or fig. 1-2, which is not described herein again.
The working principle of the oil pipe plug provided by the embodiment of the invention is as follows:
during setting, one end of the pressure plate 511a is clamped with the step structure in the outer cylinder 40, and the other end of the pressure plate 511a generates resistance to a coupling gap of the oil pipe, so that the pressure plate 511a is clamped in the coupling gap of the oil pipe, and at the moment, the oil pipe plug is fixed on the oil pipe; when the upper joint 10 is pulled, the first releasing shear pin 011 is sheared, the central rod 20 moves upwards, when the sealing effect of the sealing structure 7311 on the first liquid inlet hole 721 disappears, the first sealing cavity 731a enters liquid through the first liquid inlet hole 721, the first sealing cavity 731a generates hydrostatic pressure on the sealing ring 731 under the effect of the liquid, so that a pressure difference is formed between the first sealing cavity 731a and the second sealing cavity 731b, the second releasing shear pin 012 is sheared under the effect of the pressure difference, the piston sleeve 72 moves upwards and drives the sheath 61 and the baffle ring 624 to move upwards, when the sheath 61 moves upwards, the two rubber cylinders 541 are compressed in the axial direction and expanded in the radial direction, and the slips 52 move in the direction of the slip grooves, 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 generate acting force on the inner wall of the oil pipe; when the locking ring 623 moves to the position of the inverted tooth 621 and is fixedly matched with the inverted tooth 621, the setting of the oil pipe plug is completed.
When the fishing head is unsealed, the fishing head 30 is pulled, the first unsealing shear pin 021 and the third unsealing shear pin 023 are sheared, the outer barrel 40 moves, the pressing plate 511a is enabled to be disconnected with the step structure in the outer barrel 40, the resistance of the pressing plate 511a to a coupling gap of an oil pipe disappears, and the acting force of the locking ring 623 and the pawl 621 disappears; and then the upper joint 10 is lifted, so that the second unsealing shear pin 022 is sheared, when the sealing effect of the sealing structure 7311 on the second liquid inlet hole 722 disappears, the second liquid inlet hole 722 is communicated with the third liquid inlet hole 21, the second sealing cavity 731b enters liquid, the pressure difference between the first sealing cavity 731a and the second sealing cavity 731b disappears, the acting force of the piston sleeve 72 on the sheath 61 disappears, so that the two sealing cylinders 541 are compressed along the radial direction and stretched along the axial direction, and the slips 52 move in the direction of the slip grooves, so that the two rubber cylinders 541 do not seal the space between the outer cylinder 40 and the oil pipe any more, meanwhile, the slips 53 do not produce acting force on the inner wall of the oil pipe any more, unsealing is completed, and at this time, the oil pipe fisher can be fished out of the oil pipe.
In summary, according to the oil pipe plug provided by the embodiment of the invention, the first liquid inlet hole and the second liquid inlet hole are arranged on the piston, when liquid enters the first sealed cavity from the first liquid inlet hole, a pressure difference is formed between the first sealed cavity and the second sealed cavity, the oil pipe plug completes setting, when liquid enters the second sealed cavity from the second liquid inlet hole, the pressure difference formed between the first sealed cavity and the second sealed cavity disappears, the oil pipe plug completes unsealing, the setting and unsealing of the oil pipe plug can be realized without a preset working cylinder, and the oil pipe plug can be fished out from an oil pipe when the unsealing is completed, so that the use range of the oil pipe plug is effectively enlarged, and the applicability of the oil pipe plug is improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

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.
CN201710194060.5A 2017-03-28 2017-03-28 Oil pipe plug Active CN108661592B (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN201710194060.5A CN108661592B (en) 2017-03-28 2017-03-28 Oil pipe plug

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CN108661592A CN108661592A (en) 2018-10-16
CN108661592B true CN108661592B (en) 2020-07-10

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