CN114320227B - Full latus rectum pressure ball seat that passes after can shearing - Google Patents
Full latus rectum pressure ball seat that passes after can shearing Download PDFInfo
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- CN114320227B CN114320227B CN202111347516.XA CN202111347516A CN114320227B CN 114320227 B CN114320227 B CN 114320227B CN 202111347516 A CN202111347516 A CN 202111347516A CN 114320227 B CN114320227 B CN 114320227B
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Abstract
The invention discloses a sheared full-diameter pressure transmission ball seat, which comprises an upper joint, a ball seat outer sleeve, a first sealing ring, a split ball seat, a second sealing ring, a fixing screw, a spring plate, a ball seat outer sleeve, a shearing pin, a shearing mandrel, a third sealing ring, a fourth sealing ring, a fifth sealing ring and a lower joint. The pressure transmission ball seat is connected to the setting and releasing tool assembly of the sand control service pipe column, the pressure transmission hole is opened by ball throwing and pressurizing, and the inner part of the pipe column is of a full-diameter after the ball seat is sheared, so that the smooth passing of the subsequent setting ball is ensured; the bearing parts of the split ball seat are rigid parts, so that the ball seat is stressed more reasonably, the split ball seat is not connected with the shearing mandrel, and the split ball seat can be smoothly separated by adopting elastic sheet recovery expansion; the sealing ring is arranged at the lower part of the shearing mandrel, so that the outer wall of the shearing mandrel is prevented from being eroded by liquid flow after shearing, and the repeated use times are increased.
Description
Technical Field
The invention belongs to the technical field of oilfield development and production, and particularly relates to a shearing-back full-drift-diameter pressure transmission ball seat.
Background
Because the hydraulic drive downhole tool has the advantages of wide well type adaptability, reliable operation, convenient operation and the like, the hydraulic drive downhole tool is widely applied to completion operation of oil and gas wells, particularly in completion operation of gravel packing sand prevention of open hole wells, the pipe column is generally divided into an inner service pipe column and an outer sand prevention pipe column, the inner service pipe column and the outer sand prevention pipe column are connected into a whole through a setting tool assembly and a hand-off tool assembly connected with the service pipe column and then are put into the well head, the pipe column is pressurized only after the pipe column is put into place, and the operations of packer setting, outer sand prevention pipe column hand-off separation and the like are completed through hydraulic drive.
In addition, in order to displace the production layer drilling mud, the tubing string is often run in with a mud pump, and the flow of fluid in the tubing string is prone to sudden high pressure, which can cause advanced setting of the packer or premature disengagement of the hydraulic tripping tool, creating a downhole complication. Therefore, in the sand control completion operation of the open hole gravel packing, the pressure transmission ball seat device is additionally arranged in the setting and releasing tool assembly, so that the inside of the setting and releasing tool assembly is always in a pressure balance state, and the setting and releasing operation can be performed only after the setting ball is put into the setting ball to open the pressure transmission hole of the ball seat.
At present, the pressure transmission ball seat adopts an integrated structure of an elastic ball seat and a pressure transmission mandrel, so that the ball seat is easy to deform under the condition of high pressure in a tubular column, and then the ball seat cannot move down in place after being sheared, so that a pressure transmission hole cannot be normally opened, and a liquid flow channel in the later large-displacement circulation is also influenced; or because of structural defect, the shearing force of the ball seat is inaccurate, and the impact load generated by shearing deforms the mandrel, so that the requirement of repeated use is not met.
Disclosure of Invention
The invention aims to solve the technical problem of insufficient reliability of a pressure-transmitting ball seat of a setting and releasing tool assembly of a service tool in well completion sand prevention in the prior art, provides a pressure-transmitting ball seat with a full-diameter after shearing, realizes accurate shearing of the ball seat, and meets the requirement of repeated use for multiple times.
The invention is realized by the following technical scheme:
the shearing-back full-diameter pressure transmission ball seat comprises an upper joint, a ball seat outer sleeve, a first sealing ring, a split ball seat, a second sealing ring, a fixing screw, a spring piece, a ball seat outer sleeve, a shearing pin, a shearing mandrel, a third sealing ring, a fourth sealing ring, a fifth sealing ring and a lower joint; the ball seat device is connected in a well completion service pipe column, and the full diameter of the pipe column can be realized after the pressure transmission ball seat is sheared;
the inner surface of the upper part of the upper joint is provided with threads connected with other tubular columns, and the outer surface of the lower part of the upper joint is in threaded connection with the ball seat outer sleeve and is sealed through a first sealing ring; the outer surface of the lower part of the ball seat outer sleeve is connected with a setting and hand-off tool assembly, the inner surface of the lower part of the ball seat outer sleeve is connected with a lower joint in a threaded manner, and sealing is realized through a third sealing ring;
the ball seat outer sleeve is internally provided with a ball seat outer sleeve, and the inner surface of the ball seat outer sleeve is sequentially provided with a first inner diameter, an enlarged second inner diameter and an enlarged third inner diameter from top to bottom; the upper part of the outer surface is provided with a sealing ring groove, a second sealing ring is arranged in the sealing ring groove, and the lower part of the outer surface is opposite to the middle part of the enlarged third inner diameter and is provided with a plurality of threaded through holes along the circumference;
the first inner diameter of the ball seat outer cylinder is provided with 4 identical split ball seats, each split ball seat is of a fan-shaped structure with a central angle of 90 degrees, each split ball seat is provided with an upper split ball seat inclined plane and a lower split ball seat inclined plane, an auxiliary mounting ring groove is formed in the position, close to the outer surface, of the upper split ball seat inclined plane, a split ball seat T-shaped groove with the outer width and the inner width is formed in the lower split ball seat inclined plane along the axial direction, and a split ball seat threaded hole is formed in the middle of the bottom surface of the groove;
the lower part of the split ball seat is provided with a shearing mandrel, 4 identical strip-shaped claws are arranged on the upper part of the shearing mandrel along the circumferential direction, the upper ends of the strip-shaped claws are provided with strip-shaped claw upper inclined planes, and the inclined plane angles are identical with the angle of the lower inclined plane of the split ball seat. The outer surface is provided with a transition inclined plane, an enlarged first outer diameter, an enlarged second outer diameter and a lower outer sealing surface from top to bottom in sequence. And 4 shearing mandrel T-shaped grooves with the outer narrow and the inner wide are axially formed in the enlarged first outer diameter, a shearing mandrel threaded hole is formed in the middle of the bottom surface of the groove, and the circumferential positions of the shearing mandrel T-shaped grooves are opposite to the gap between the two strip-shaped claws of the shearing mandrel. A shearing pin groove is formed in the enlarged second outer diameter, a shearing mandrel pressure transmission through hole is formed in the middle of the lower outer sealing surface, an upper sealing ring groove and a lower sealing ring groove with a certain interval are formed in the position, close to the lower end, of the lower outer sealing surface, a fourth sealing ring is arranged in the upper sealing ring groove, and a fifth sealing ring is arranged in the lower sealing ring groove;
the split ball seat is connected with the shearing mandrel through the elastic sheet, two ends of the elastic sheet are of circular transition thin-wall structures, the width of the elastic sheet is slightly smaller than the gap between the two strip-shaped claws of the shearing mandrel, an upper waist-shaped hole and a lower waist-shaped hole are respectively arranged at the positions close to the two ends, the upper waist-shaped hole is inserted into a wide groove of the T-shaped groove of the split ball seat, and the lower waist-shaped hole is inserted into the wide groove of the T-shaped groove of the shearing mandrel. After the upper inclined surface of the strip-shaped claw of the shearing mandrel is attached to the lower inclined surface of the split ball seat, a fixing screw is arranged in a split ball seat threaded hole in the bottom surface of the T-shaped groove of the split ball seat through an upper waist-shaped hole of the elastic sheet, and a fixing screw is arranged in a shearing mandrel threaded hole of the shearing mandrel through a lower waist-shaped hole of the elastic sheet.
The split ball seat is formed by cutting an integral ball seat, and the outer diameter of the split ball seat is slightly smaller than the first inner diameter of the ball seat outer cylinder;
and after the shearing pin groove of the shearing mandrel is aligned with the threaded through hole of the ball seat outer barrel, a shearing pin is arranged in the threaded through hole.
An inner sealing surface and a limiting shoulder are arranged in the lower joint, a lower joint pressure transmission through hole is formed in the middle of the inner sealing surface along the circumferential direction, when the lower joint is connected with the ball seat outer sleeve in place, the axial position of the lower joint pressure transmission through hole is positioned between a fourth sealing ring and a fifth sealing ring of the shearing mandrel, and the outer surface of the lower part of the lower joint is provided with threads connected with a setting and releasing tool assembly;
when the split ball seat pushes the shearing mandrel to move downwards to the second enlarged inner diameter of the ball seat outer barrel under high pressure, the split ball seat moves outwards along the radial direction under the action of the restoring force of the elastic sheet to be attached to the second enlarged inner diameter of the ball seat outer barrel;
after the shearing pin is sheared by the shearing mandrel, the lower end face of the shearing mandrel moves downwards to a limiting shoulder in the lower joint, the fourth sealing ring arranged on the outer sealing surface of the lower part of the shearing mandrel moves downwards to pass through the lower joint pressure transmission through hole of the lower joint, and the shearing mandrel pressure transmission through hole of the shearing mandrel is communicated with the lower joint pressure transmission through hole of the lower joint.
Compared with the prior art, the invention has the advantages that:
the sheared full-diameter pressure-transmitting ball seat is convenient to operate on site, and the inner part of a pipe column is full-diameter after the ball seat is sheared, so that the smooth passing of a subsequent setting ball is ensured; the bearing parts of the split ball seat are rigid parts, so that the ball seat is stressed more reasonably, the split ball seat is not connected with the shearing mandrel, and the split ball seat can be smoothly separated by adopting elastic sheet recovery expansion; the sealing ring is arranged at the lower part of the shearing mandrel, so that the outer wall of the shearing mandrel is prevented from being eroded by liquid flow after shearing, and the repeated use times are increased.
Drawings
FIG. 1 is a schematic structural view of a shearable full-bore pressure-transmitting ball seat according to the present invention.
Fig. 2 is a schematic diagram (one) of a split ball seat structure of a sheared full-diameter pressure-transmitting ball seat according to the invention.
Fig. 3 is a schematic diagram of a split ball seat structure of a sheared full-diameter pressure-transmitting ball seat according to the invention (II).
Fig. 4 is a schematic diagram of a spring structure of a sheared full-diameter pressure-transmitting ball seat according to the present invention.
FIG. 5 is a schematic view of a shear mandrel structure (I) of a full-bore pressure-transmitting ball seat after shearing according to the present invention.
FIG. 6 is a schematic view of a shear mandrel structure of a full-bore pressure-transmitting ball seat after shearing according to the present invention.
FIG. 7 is a schematic view of the structure of a lower joint of a shearable full-diameter pressure-transmitting ball seat according to the present invention.
FIG. 8 is a schematic diagram of the structure of the ball seat outer cylinder of the full-diameter pressure transmission ball seat after shearing.
Reference numerals: 1. the sealing device comprises an upper joint, 2, a ball seat outer sleeve, 3, a first sealing ring, 4, a split ball seat, 41, a split ball seat upper inclined surface, 411, an auxiliary installation ring groove, 42, a split ball seat lower inclined surface, 421, a split ball seat T-shaped groove, 422, a split ball seat threaded hole, 5, a second sealing ring, 6, a fixing screw, 7, a spring plate, 71, an upper waist-shaped hole, 72, a lower waist-shaped hole, 8, a ball seat outer sleeve, 81, a first inner diameter, 82, an enlarged second inner diameter, 83, an enlarged third inner diameter, 84, a sealing ring groove, 85, a threaded through hole, 9, a shearing pin, 10, a shearing mandrel, 101, a strip claw, 1011, a strip claw upper inclined surface, 102, a transition inclined surface, 103, an enlarged first outer diameter, 1031, a shearing mandrel T-shaped groove, 1032, a shearing mandrel threaded hole, 104, an enlarged second outer diameter, 1041, a shearing pin groove, 105, a lower outer sealing surface, 1051, a shearing mandrel pressure transmission through hole, 1052, an upper sealing ring groove, 1053, a lower sealing ring groove, 11, a third sealing ring, 12, a fourth sealing ring, 13, a fifth sealing ring, a lower joint, a limiting sealing surface, a limiting sealing ring and a lower joint.
Other relevant drawings may be made by those of ordinary skill in the art from the above figures without undue burden.
Detailed Description
The technical scheme of the invention is further described below with reference to specific embodiments.
Examples
As shown in fig. 1, the embodiment provides a sheared full-diameter pressure-transmitting ball seat, which comprises an upper joint 1, a ball seat outer sleeve 2, a first sealing ring 3, a split ball seat 4, a second sealing ring 5, a fixing screw 6, a spring piece 7, a ball seat outer sleeve 8, a shearing pin 9, a shearing mandrel 10, a third sealing ring 11, a fourth sealing ring 12, a fifth sealing ring 13 and a lower joint 14; the ball seat device is connected in a well completion service pipe column, and the full diameter of the pipe column can be realized after the pressure transmission ball seat is sheared.
The inner surface of the upper part of the upper joint 1 is provided with threads connected with other tubular columns, and the outer surface of the lower part is in threaded connection with the ball seat outer sleeve 2 and is sealed by the first sealing ring 3; the lower outer surface of the ball seat outer sleeve 2 is connected with a setting and releasing tool assembly, and the lower inner surface is in threaded connection with the lower joint 14 and is sealed through the third sealing ring 11.
The ball seat outer sleeve 2 is internally provided with a ball seat outer sleeve 8, the inner surface of the ball seat outer sleeve 8 is sequentially provided with a first inner diameter 81, an enlarged second inner diameter 82 and an enlarged third inner diameter 83 from top to bottom; the upper part of the outer surface is provided with a sealing ring groove 84, the second sealing ring 5 is arranged in the sealing ring groove 84, and the lower part of the outer surface is opposite to the middle part of the enlarged third inner diameter 83, and a plurality of threaded through holes 85 are formed along the circumference.
The first inner diameter 81 of the tee outer barrel 8 is provided with 4 identical split tee seats 4 cut by an integral tee, the split tee seats 4 are of a fan-shaped structure with a central angle of 90 degrees, and the outer diameter of the split tee seats is slightly smaller than the first inner diameter 81 of the tee outer barrel; the split ball seat 4 is provided with a split ball seat upper inclined surface 41 and a split ball seat lower inclined surface 42, an auxiliary mounting annular groove 411 is formed in the position, close to the outer surface, of the split ball seat upper inclined surface 41, a split ball seat T-shaped groove 421 with the outer narrow and the inner wide is formed in the split ball seat lower inclined surface 42 along the axial direction, and a split ball seat threaded hole 422 is formed in the middle of the bottom surface of the groove; after the 4 split ball seats 4 are spliced into a whole in the circumferential direction, the split ball seats 4 are inserted into the auxiliary mounting annular groove 411 through a cylindrical tool, and simultaneously are fed into the first inner diameter 81 of the ball seat outer cylinder 8.
The lower part of the split ball seat 4 is provided with a shearing mandrel 10, 4 identical strip-shaped claws 101 are arranged on the upper part of the shearing mandrel 10 along the circumferential direction, the upper ends of the strip-shaped claws 101 are provided with strip-shaped claw upper inclined planes 1011, and the inclined planes are the same as the angle of the split ball seat lower inclined planes 42 of the split ball seat 4. The outer surface is provided with a transition bevel 102, an enlarged first outer diameter 103, an enlarged second outer diameter 104 and a lower outer sealing surface 105 in sequence from top to bottom. At the enlarged first outer diameter 103, 4 shearing mandrel T-shaped grooves 1031 with a narrow outside and a wide inside are axially provided, and at the middle position of the bottom surface of the groove, shearing mandrel screw holes 1032 are provided, and the circumferential position of the shearing mandrel T-shaped grooves 1031 is opposite to the gap between the two bar claws 101 of the shearing mandrel 10. A shear pin groove 1041 is provided at the enlarged second outer diameter 104, a shear mandrel pressure transmission through hole 1051 is provided at the middle of the lower outer sealing surface 105, an upper sealing ring groove 1052 and a lower sealing ring groove 1053 are provided at the lower end of the lower outer sealing surface 105 near the lower end with a certain interval, a fourth sealing ring 12 is installed in the upper sealing ring groove 1052, and a fifth sealing ring 13 is installed in the lower sealing ring groove 1053.
The split ball seat 4 and the shearing mandrel 10 are connected through the elastic sheet 7, two ends of the elastic sheet 7 are of a circular transition thin-wall structure, the width of the elastic sheet is slightly smaller than the gap between the two strip-shaped claws 101 of the shearing mandrel 10, an upper waist-shaped hole 71 and a lower waist-shaped hole 72 are respectively arranged at positions close to the two ends, the upper waist-shaped hole 71 is inserted into a wide groove of the split ball seat T-shaped groove 421, and the lower waist-shaped hole 72 is inserted into a wide groove of the shearing mandrel T-shaped groove 1031. After the upper inclined surface 1011 of the bar claw of the shearing mandrel 10 is attached to the lower inclined surface 42 of the split ball seat, the fixing screw 6 is installed in the split ball seat threaded hole 422 of the bottom surface of the split ball seat T-shaped groove 421 through the upper waist-shaped hole 71 of the elastic sheet 7, and the fixing screw 6 is installed in the shearing mandrel threaded hole 1032 of the shearing mandrel 10 through the lower waist-shaped hole 72 of the elastic sheet 7.
After the shear pin groove 1041 of the shear mandrel 10 is aligned with the threaded through-hole 85 of the tee outer tube 8, the shear pin 9 is installed in the threaded through-hole 85.
The inner sealing surface 141 and the limiting shoulder 142 are arranged in the lower joint 14, the lower joint pressure transmission through hole 143 is arranged in the middle of the inner sealing surface 141 along the circumferential direction, and when the lower joint 14 and the ball seat outer sleeve 2 are connected in place, the axial position of the lower joint pressure transmission through hole 143 is located between the fourth sealing ring 12 and the fifth sealing ring 13 of the shearing mandrel 10. The lower outer surface of the lower sub 14 has threads for connection to a setting and unsetting tool assembly.
The invention relates to a sheared full-drift diameter pressure transmission ball seat, which has the following working principle:
the ball seat is connected to the setting and hand-off tool assembly of the sand control service pipe column, and a sealing cavity is formed by the first sealing ring 3, the third sealing ring 11, the fourth sealing ring 12 and the fifth sealing ring 13 in the ball seat in the pipe column running process, so that the whole pipe column is ensured not to leak in the circulation process; at the same time, the shearing mandrel 10 is in a pressure balance state and cannot be sheared due to pressure fluctuation, so that the shearing mandrel pressure transmission through hole 1051 is prevented from being communicated with the lower joint pressure transmission through hole 143, and pressure is prevented from being transmitted to the setting and unsetting tool assembly.
After the well head is put into place, the well head is put into the setting ball and is pumped to the split ball seat 4, and the sealing is pressed and sealed through the upper inclined surface 41 of the setting ball and the split ball seat, and because the site operation is large-displacement pumping, the leakage generated by the tiny gaps among the 4 split ball seats 4 and the tiny gaps between the circumferential outer surface of the split ball seat 4 and the first inner diameter 81 of the ball seat outer cylinder 8 can not substantially affect the whole sealing, and the increase of the pressure in the pipe column above the ball seat device can be realized by increasing the pressure of the pump port.
Continuing to increase the pressure in the tubular string, the ballast load acting on the split ball seat 4 is transferred to the shear pin 9 through the shear mandrel 10, when the ballast load is greater than the shear load of the shear pin 9, the shear pin 9 is sheared, and the lowest end of the shear mandrel 10 moves down to the limit shoulder 142 of the lower joint 14 under the action of the inertial force and the flushing force of the liquid flow at the moment when the shear pin 9 shears. In the process of moving down the shearing mandrel 10, when the split ball seat 4 moves down to the enlarged second inner diameter 82 of the ball seat outer barrel 8, the outer surface of the split ball seat 4 loses constraint, and moves radially outwards to be attached to the enlarged second inner diameter 82 of the ball seat outer barrel 8 under the action of the restoring force of the elastic sheet 7, and at the moment, the inner diameter of the split ball seat 4 is larger than the outer diameter of the setting ball, so that the setting ball can reach the next stage of ball seat through the ball seat device.
Meanwhile, the fourth sealing ring 12 arranged on the shearing mandrel 10 moves downwards to pass through the lower joint pressure transmission through hole 143 of the lower joint 14, the shearing mandrel pressure transmission through hole 1051 of the shearing mandrel 10 is communicated with the lower joint pressure transmission through hole 143 of the lower joint 14, and the liquid flow pressure in the pipe column can be transmitted to the setting and unsetting tool assembly, so that the hydraulic unsetting function of the packer and the hydraulic unsetting function of the inner and outer pipe columns are realized.
The shearing mandrel 10 of the full-diameter pressure-transmitting ball seat after shearing moves downwards to limit the lowest end, and the split ball seat 4 can be timely expanded outwards and separated from the shearing mandrel 10, so that the ball seat is prevented from being damaged by impact force; in addition, the fourth sealing ring 12 and the fifth sealing ring 13 which are arranged on the shearing mandrel 10 always keep a sealing state with the inner sealing surface 141 of the lower joint 14, so that liquid flow is prevented from generating erosion through the outer surface of the shearing mandrel 10 when a pipe column circulates, and the requirement of repeated use is met.
The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The terms "coupled" and "connected," as used herein, are intended to encompass both direct and indirect coupling (coupling), unless otherwise indicated. In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative, not restrictive, and many changes may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the appended claims, which are to be construed as falling within the scope of the present invention.
Claims (5)
1. The utility model provides a but full latus rectum pressure ball seat is passed in back shearing which characterized in that: the device comprises an upper joint, a ball seat outer sleeve, a first sealing ring, a split ball seat, a second sealing ring, a fixing screw, a spring piece, a ball seat outer barrel, a shearing pin, a shearing mandrel, a third sealing ring, a fourth sealing ring, a fifth sealing ring and a lower joint; the ball seat device is connected in a well completion service pipe column, and the full diameter of the pipe column can be realized after the pressure transmission ball seat is sheared;
the inner surface of the upper part of the upper joint is provided with threads connected with other tubular columns, and the outer surface of the lower part of the upper joint is in threaded connection with the ball seat outer sleeve and is sealed through a first sealing ring; the outer surface of the lower part of the ball seat outer sleeve is connected with a setting and hand-off tool assembly, the inner surface of the lower part of the ball seat outer sleeve is connected with a lower joint in a threaded manner, and sealing is realized through a third sealing ring;
the ball seat outer sleeve is internally provided with a ball seat outer sleeve, and the inner surface of the ball seat outer sleeve is sequentially provided with a first inner diameter, an enlarged second inner diameter and an enlarged third inner diameter from top to bottom; the upper part of the outer surface is provided with a sealing ring groove, a second sealing ring is arranged in the sealing ring groove, and the lower part of the outer surface is opposite to the middle part of the enlarged third inner diameter and is provided with a plurality of threaded through holes along the circumference;
the first inner diameter of the ball seat outer cylinder is provided with 4 identical split ball seats, each split ball seat is of a fan-shaped structure with a central angle of 90 degrees, each split ball seat is provided with an upper split ball seat inclined plane and a lower split ball seat inclined plane, an auxiliary mounting ring groove is formed in the position, close to the outer surface, of the upper split ball seat inclined plane, a split ball seat T-shaped groove with the outer width and the inner width is formed in the lower split ball seat inclined plane along the axial direction, and a split ball seat threaded hole is formed in the middle of the bottom surface of the groove;
the lower part of the split ball seat is provided with a shearing mandrel, the upper part of the shearing mandrel is provided with 4 identical strip-shaped claws along the circumferential direction, the upper ends of the strip-shaped claws are provided with strip-shaped claw upper inclined planes, the angle of the inclined planes is identical to that of the split ball seat lower inclined planes of the split ball seat, the outer surfaces of the split ball seat are sequentially provided with a transition inclined plane, an enlarged first outer diameter, an enlarged second outer diameter and a lower outer sealing surface from top to bottom, the enlarged first outer diameter is provided with 4 outer narrow and inner wide shearing mandrel T-shaped grooves along the axial direction, the middle part of the bottom surface of the groove is provided with a shearing mandrel threaded hole, the circumferential position of the shearing mandrel T-shaped groove is opposite to the gap between the two strip-shaped claws of the shearing mandrel, the middle part of the enlarged second outer diameter is provided with a shearing mandrel pressure transmission through hole, the middle part of the lower outer sealing surface is provided with an upper sealing ring groove and a lower sealing ring groove with a certain interval, the upper sealing ring is arranged in the upper sealing ring groove, and a fifth sealing ring is arranged in the lower sealing ring groove;
the split ball seat is connected with the shearing mandrel through an elastic sheet, two ends of the elastic sheet are of a circular transition thin-wall structure, the width of the elastic sheet is slightly smaller than the gap between two strip-shaped claws of the shearing mandrel, an upper waist-shaped hole and a lower waist-shaped hole are respectively arranged at positions close to the two ends, the upper waist-shaped hole is inserted into a wide groove of a T-shaped groove of the split ball seat, the lower waist-shaped hole is inserted into the wide groove of the T-shaped groove of the shearing mandrel, after the upper inclined surface of the strip-shaped claw of the shearing mandrel is attached to the lower inclined surface of the split ball seat, a fixing screw is arranged in a threaded hole of the split ball seat on the bottom surface of the T-shaped groove of the split ball seat through the upper waist-shaped hole of the elastic sheet, and a fixing screw is arranged in a threaded hole of the shearing mandrel through the lower waist-shaped hole of the elastic sheet;
the internal sealing surface and the limiting shoulder are arranged in the lower joint, the lower joint pressure transmission through hole is formed in the middle of the internal sealing surface along the circumferential direction, when the lower joint is connected with the ball seat sleeve in place, the axial position of the lower joint pressure transmission through hole is located between the fourth sealing ring and the fifth sealing ring of the shearing mandrel, and the outer surface of the lower part of the lower joint is provided with threads connected with a setting tool assembly and a releasing tool assembly.
2. The shearable full-diameter pressure-transmitting ball seat according to claim 1, wherein: the split ball seat is formed by cutting an integral ball seat, and the outer diameter of the split ball seat is slightly smaller than the first inner diameter of the ball seat outer cylinder.
3. The shearable full-diameter pressure-transmitting ball seat according to claim 1, wherein: and after the shearing pin groove of the shearing mandrel is aligned with the threaded through hole of the ball seat outer barrel, a shearing pin is arranged in the threaded through hole.
4. The shearable full-diameter pressure-transmitting ball seat according to claim 1, wherein: when the split ball seat pushes the shearing mandrel to move downwards to the second enlarged inner diameter of the ball seat outer barrel under high pressure, the split ball seat moves outwards along the radial direction under the action of the restoring force of the elastic piece and is attached to the second enlarged inner diameter of the ball seat outer barrel.
5. The shearable full-diameter pressure-transmitting ball seat according to claim 1, wherein: after the shearing pin is sheared by the shearing mandrel, the lower end face of the shearing mandrel moves downwards to a limiting shoulder in the lower joint, the fourth sealing ring arranged on the outer sealing surface of the lower part of the shearing mandrel moves downwards to pass through the lower joint pressure transmission through hole of the lower joint, and the shearing mandrel pressure transmission through hole of the shearing mandrel is communicated with the lower joint pressure transmission through hole of the lower joint.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111347516.XA CN114320227B (en) | 2021-11-15 | 2021-11-15 | Full latus rectum pressure ball seat that passes after can shearing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111347516.XA CN114320227B (en) | 2021-11-15 | 2021-11-15 | Full latus rectum pressure ball seat that passes after can shearing |
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| Publication Number | Publication Date |
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| CN114320227A CN114320227A (en) | 2022-04-12 |
| CN114320227B true CN114320227B (en) | 2023-07-28 |
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| CN202111347516.XA Active CN114320227B (en) | 2021-11-15 | 2021-11-15 | Full latus rectum pressure ball seat that passes after can shearing |
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| CN114320227A (en) | 2022-04-12 |
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