CN112227994A - Tail pipe hanger preventing lifting forward and hanging - Google Patents
Tail pipe hanger preventing lifting forward and hanging Download PDFInfo
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- CN112227994A CN112227994A CN201910636142.XA CN201910636142A CN112227994A CN 112227994 A CN112227994 A CN 112227994A CN 201910636142 A CN201910636142 A CN 201910636142A CN 112227994 A CN112227994 A CN 112227994A
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- 230000007246 mechanism Effects 0.000 claims abstract description 126
- 239000000725 suspension Substances 0.000 claims abstract description 36
- 238000010276 construction Methods 0.000 claims abstract description 15
- 230000005540 biological transmission Effects 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 8
- 238000012546 transfer Methods 0.000 claims description 8
- 230000002512 anti-withdrawal effect Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 8
- 230000032683 aging Effects 0.000 abstract description 4
- 239000003208 petroleum Substances 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000005553 drilling Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 241001397809 Hakea leucoptera Species 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000004636 vulcanized rubber Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
- E21B23/01—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for anchoring the tools or the like
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Abstract
The invention provides a liner hanger, which belongs to the field of downhole tools for petroleum cementing and completion and comprises an external device, wherein the external device is left in a well after downhole construction operation and comprises a suspension mechanism provided with slips and a tieback cylinder capable of pushing the suspension mechanism to prop the slips open; the internal device is lifted out of a wellhead after underground construction operation and comprises a sitting and hanging driving mechanism connected with the tieback cylinder, and the sitting and hanging driving mechanism drives the tieback cylinder to move through hydraulic pressure; the sitting and hanging driving mechanism keeps pressure balance before the pressure-holding ball is thrown into the sitting and hanging driving mechanism so as to be in a locking state, and the sitting and hanging driving mechanism loses the pressure balance after the pressure-holding ball is thrown into the sitting and hanging driving mechanism and is started, so that the tieback cylinder is pushed to move. The sitting and hanging driving mechanism has balanced pressure before sitting and hanging, keeps a locking state and can prevent the sitting and hanging in advance in the running process; the driving mechanism is hung to the back of construction seat and is carried out the well head along with interior device, avoids taking place ageing influence leakproofness.
Description
Technical Field
The invention relates to a tail pipe hanger capable of preventing forward hanging and belongs to the field of downhole tools for petroleum well cementing and completion.
Background
The liner hanger is a well tool commonly used in petroleum exploration and development at present, and can be divided into three types, namely a mechanical type, a hydraulic type and a hydraulic mechanical double-acting type according to different sitting and hanging modes, while the hydraulic liner hanger is most widely applied. The hydraulic liner hanger is used for starting the hanging driving mechanism by suppressing pressure in the pipe and pushing the slips to move upwards to realize hanging. At present, in order to solve the problem of tail pipe cementing under complex well conditions such as a deep well, a small clearance well, a large displacement well and the like, various hydraulic liner hangers of different types are developed in China in succession, have the characteristics of high bearing capacity, high running reliability and the like, and have the following defects:
first, the driving mechanism design is hung in sitting of traditional fluid pressure type liner hanger is outside hanger body, will stay in the well for a long time after the well cementation construction, owing to sit and hang driving mechanism unavoidably need use rubber seal, and rubber seal is easy ageing under the high temperature high pressure environment in the well for a long time, leads to sitting and hangs the sealed inefficacy of driving mechanism department to influence the sealed permanence of whole pit shaft.
Second, during the lowering process of the conventional hydraulic liner hanger, the setting and hanging driving mechanism may move in advance due to unstable pressure in the pipe, so that the liner hanger may be set and hung in advance.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a liner hanger capable of preventing forward hanging, wherein a hanging driving mechanism of the liner hanger is balanced in pressure before hanging, keeps a locking state and can prevent the liner hanger from being hung in advance in the running process; the driving mechanism is hung to the back of construction seat and is carried out the well head along with interior device, avoids taking place ageing influence leakproofness.
In order to achieve the above object, the present invention provides a liner hanger for preventing forward sitting and hanging, comprising:
the external device is left in the well after underground construction operation and comprises a suspension mechanism provided with slips and a connecting back cylinder capable of pushing the suspension mechanism to prop the slips open; and
the internal device is lifted out of a wellhead after underground construction operation and comprises a sitting and hanging driving mechanism connected with the tieback cylinder, and the sitting and hanging driving mechanism drives the tieback cylinder to move through hydraulic pressure;
the sitting and hanging driving mechanism keeps pressure balance before the pressure-holding ball is thrown into the sitting and hanging driving mechanism so as to be in a locking state, and the sitting and hanging driving mechanism loses the pressure balance after the pressure-holding ball is thrown into the sitting and hanging driving mechanism and is started, so that the tieback cylinder is pushed to move.
The invention has the further improvement that the sitting and hanging driving mechanism comprises a mandrel, a hydraulic cylinder is arranged outside the mandrel, and a piston is arranged in the hydraulic cylinder;
the piston comprises a piston block arranged in the hydraulic cylinder and a piston rod extending out of the upper portion of the hydraulic cylinder, and a plug cap connected with the tieback cylinder is arranged at the end portion of the piston rod.
The invention has the further improvement that a ball seat mechanism is arranged below the sitting and hanging driving mechanism and comprises a cylindrical ball seat body, and a plurality of connecting holes communicated with the hydraulic cylinder are axially arranged on the wall of the ball seat body; and an expandable ball seat matched with the pressure building ball is arranged in the ball seat body.
The invention has the further improvement that the space above the piston block in the hydraulic cylinder is a sitting and hanging cavity which is communicated with a flow passage in the middle through an upper pressure transfer hole arranged on the mandrel;
a space below the piston block in the hydraulic cylinder is a pressure balance cavity which is communicated with the connecting hole and is communicated with a flow passage in the middle through a lower pressure transfer hole arranged at the lower end of the connecting hole;
wherein the expandable ball seat is positioned between the upper pressure transmission hole and the lower pressure transmission hole.
The invention is further improved in that the expandable ball seat comprises a ball seat supporting cylinder, and a split ball seat is arranged at the upper end of the ball seat supporting cylinder; the split ball seat comprises a plurality of split ball seat blocks; the upper end of the split ball seat block is matched with the pressure-building ball, and the lower end of the split ball seat block is detachably connected with the ball seat supporting barrel;
the ball seat support barrel is connected with the first shear pin sleeve through a first shear pin;
after the seat hanging is completed, the pressure on the upper part of the ball seat supporting barrel pushes and cuts off the first shear pin, so that the ball seat supporting barrel moves downwards, and when the split ball seat moves downwards to the rectangular groove, the split ball seat loses support and is separated from the pressure building ball.
The ball seat is further improved in that a lower joint is arranged at the lower end of the ball seat body, and a releasing mechanism is arranged at the lower end of the lower joint; wherein, the lower pass pressure hole sets up in the upper end of lower clutch.
The invention has the further improvement that the upper end of the mandrel is connected with a lifting joint through a buckle changing joint, and the lifting joint is connected with a feeding drilling tool above the lifting joint; the lower end of the releasing mechanism is connected with a central pipe, and the lower end of the central pipe is connected with a rubber plug connector.
The invention is further improved in that the suspension mechanism comprises a suspension mechanism body arranged outside the central tube, and the slips are fixedly arranged at the lower part of the suspension mechanism body; the upper part of the suspension mechanism body is provided with a taper sleeve matched with the slips, and the taper sleeve is connected with the return connection cylinder through a snap spring sleeve and a suspension mechanism connecting cylinder; and the clamp spring sleeve is matched with the hanging mechanism body through an anti-withdrawal clamp spring.
The invention has the further improvement that the lower part of the suspension mechanism body is connected with a second shear pin sleeve through an unlocking shear pin, and the upper part of the second shear pin sleeve is provided with a slip supporting sleeve; the slips are fixed on the slip support sleeve.
A further improvement of the invention is that a sealing cartridge is arranged between the central tube and the suspension body.
Compared with the prior art, the invention has the advantages that:
in the anti-lifting front-mounted liner hanger, the mounting and hanging driving mechanism is positioned in the internal device, and can be lifted out of a well mouth after construction, so that the problem that the whole shaft is influenced in sealing durability because the mounting and hanging driving mechanism is easy to age and lose efficacy when left in the well is solved, and the requirements of construction such as high-temperature and high-pressure wells, gas storage wells, liner fracturing and the like are met. On the other hand, the sitting and hanging driving mechanism is in a locking state before the pressure-holding ball is put into the sitting and hanging driving mechanism, the pressure inside the sitting and hanging driving mechanism is kept balanced, the early starting caused by unstable pressure due to high-strength operation in the descending process is avoided, and the problem of early sitting and hanging is solved.
Drawings
Preferred embodiments of the present invention will be described in detail below with reference to the attached drawing figures, wherein:
FIG. 1 is a schematic diagram of a tailpipe hanger for anti-lift landing, according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a sitting and hanging driving mechanism according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of a sitting and hanging driving mechanism and a tieback cylinder according to an embodiment of the present invention;
FIG. 4 is a schematic structural view of a split ball socket block according to an embodiment of the present invention, showing a side structure;
FIG. 5 is a schematic structural view of a split ball socket block according to an embodiment of the present invention, showing the structure of the connecting body;
FIG. 6 is a schematic view of a tee support barrel according to an embodiment of the present invention;
FIG. 7 is a cross-sectional view of a tee support cylinder according to an embodiment of the present invention;
FIG. 8 is a schematic structural view of a suspension mechanism according to an embodiment of the present invention;
fig. 9 is a schematic structural view of a sitting-hanging pushing device according to an embodiment of the present invention, showing a state before sitting and hanging;
FIG. 10 is a schematic structural diagram of a sitting/hanging pushing device according to an embodiment of the present invention, showing a state during sitting/hanging;
fig. 11 is a schematic structural view of a sitting/hanging pushing device according to an embodiment of the present invention, showing a state that a split ball seat is expanded.
In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.
The meaning of the reference symbols in the drawings is as follows: 1. a lifting joint, 2, a change-over joint, 3, a plug cap, 4, a tieback, 5, a hanging driving mechanism, 6, a ball seat mechanism, 7, a releasing mechanism, 8, a sealing core, 9, a hanging mechanism, 10, a central pipe, 11, a rubber plug joint, 12, a pressure-building ball, 31, a retainer ring, 501, a mandrel, 502, a hydraulic cylinder, 503, a piston, 511, an upward pressure-transmitting hole, 521, a hanging cavity, 522, a pressure balance cavity, 531, a piston block, 532, a piston rod, 533, a piston connecting cylinder, 601, a ball seat body, 602, an expandable ball seat, 603, a connecting hole, 604, a ball seat supporting cylinder, 605, a split ball seat, 606, a split ball seat block, 607, a connecting body, 608, a clamping groove, 609, a rectangular groove, 610, a first shear pin sleeve, 611, a first shear pin, 612, a lower joint, 613, a lower pressure-transmitting hole, 901, a hanging mechanism body, 902, a slip, 903, a hanging mechanism connecting cylinder, 904. the anti-withdrawal snap spring comprises a snap spring sleeve 905, a snap spring sleeve 906, a taper sleeve 907, a second shear pin sleeve 908, an unlocking shear pin 909, a slip supporting sleeve 910 and a centralizer.
Detailed Description
In order to make the technical solutions and advantages of the present invention more apparent, exemplary embodiments of the present invention are described in further detail below with reference to the accompanying drawings. It is clear that the described embodiments are only a part of the embodiments of the invention, and not an exhaustive list of all embodiments. And the embodiments and features of the embodiments may be combined with each other without conflict.
FIG. 1 schematically illustrates a liner hanger for anti-lift landing, according to one embodiment of the present invention. According to the liner hanger for preventing forward hanging, the pressure of the hanging driving mechanism is balanced before hanging, the locking state is kept, and the forward hanging can be prevented in the running process; the driving mechanism is hung to the back of construction seat and is carried out the well head along with interior device, avoids taking place ageing influence leakproofness.
Fig. 1 schematically shows a pipe liner hanger against forward landing, according to one embodiment of the invention, comprising an external device comprising a suspension mechanism 9, the suspension mechanism 9 being provided with slips 902. The external device also comprises a tieback cylinder 4, and the tieback cylinder 4 is arranged above the suspension mechanism 9 and is connected with the suspension mechanism 9. The tieback cylinder 4 can move in the axial direction (the liner hanger is in a vertical state when in a working state, and the tieback cylinder can move up and down in the vertical direction), and when the tieback cylinder 4 moves down, thrust can be applied to the suspension mechanism 9, so that the slips 902 are spread. The liner hanger preventing the liner from being hung in advance further comprises an internal device, and the internal device comprises a hanging driving mechanism 5. The sitting and hanging driving mechanism 5 is connected with the tieback cylinder 4 and drives the tieback cylinder 4 to move through the action of hydraulic pressure, and driving force is provided for opening and closing slips 902 of the hanging mechanism 9. The sitting and hanging driving mechanism 5 keeps pressure balance before the pressure-holding ball 12 is put into the sitting and hanging driving mechanism so as to be in a locking state, and after the pressure-holding ball 12 is put into the sitting and hanging driving mechanism, the hydraulic pressure at the upper part is increased due to the blocking of the pressure-holding ball 12 and influences the pressure in the sitting and hanging driving mechanism 5, so that the sitting and hanging driving mechanism loses the pressure balance and starts, and the catching cylinder 4 is pushed to move. In this embodiment, the external device is left in the well after the cementing operation, and the internal device is lifted out of the wellhead after the cementing operation.
In this embodiment, the directions "up" and "down" are determined according to the state of the anti-advance setting liner hanger in the working state of the downhole, the "up" direction is the direction towards the wellhead, the "down" direction is the direction away from the wellhead, fig. 1 and 8 show the position characteristics in the working state, and the upper part in the drawings is the "up" direction in this embodiment; in fig. 2, 3 and 9 to 11, the left side is the "upper" side described in the present embodiment.
When the anti-lifting pipe hanger according to the embodiment is used, during the lowering of the anti-lifting pipe hanger with a tail pipe, the pressure in the hanging driving mechanism 5 is in a balanced state, so that the pressure is kept fixed, and the position of the tieback cylinder 4 connected with the tieback cylinder is also kept fixed. In this way, the pressure balance in the sitting and hanging driving mechanism 5 is not affected by the high-intensity operation in the process of descending, so that the connecting back cylinder 4 cannot descend relatively, and the problem that the hanging mechanism 9 is hung in advance is avoided. When the pressure is in place, the pressure on the upper part of the pressure-building ball 12 is increased by the ball throwing, the pressure on the upper part of the piston of the sitting and hanging driving mechanism 5 communicated with the pressure is increased, and the piston moves downwards under the action of the pressure and drives the return cylinder 4 to move. The tieback 4 moves downward to push against the hang mechanism 9, causing the slips 902 to spread apart. In addition, the liner hanger that seat was hung in advance of preventing stated this embodiment compares in current liner hanger, and its seat hangs actuating mechanism 5 and sets up in the internal installation, and the well head is not stayed in along with the whole lift-up of internal installation after the construction completion outside, in the well. Therefore, the problem that the rubber sealing device of the sitting and hanging driving mechanism 5 is aged and invalid under the underground high-temperature and high-pressure environment to influence the sealing durability of the whole shaft is solved.
In one embodiment, as shown in fig. 2 and 3, the sitting and hanging driving mechanism 5 includes a mandrel 501, the mandrel 501 is a tubular structure and is arranged in the middle, and a hydraulic cylinder 502 is arranged outside the mandrel 501. The cylinder 502 is provided with an upward opening, and a piston 503 is provided inside the cylinder. Piston 503 includes a piston block 531 and a piston rod 532, piston block 531 being disposed within cylinder 502 and constrained to move within cylinder 502, and piston rod 532 projecting upwardly through an opening in the upper end of cylinder 502. In this embodiment, the end of the piston rod 532 is connected to the plug cap 3, and the plug cap 3 is connected to the return cylinder 4.
Preferably, the piston rod 532 is provided with a piston connecting cylinder 533 at the upper part, and the piston connecting cylinder 533 is coated on the outer wall of the mandrel 501 and moves along with the movement of the piston rod 532. The plug cap 3 is fixed to an upper end of the piston connecting cylinder 533, and the upper end of the plug cap 3 is provided with a stopper ring 31 that restricts upward movement of the plug cap 3. The edge of the lower end of the plug cap 3 is provided with an annular groove for connecting with the inner side of the upper end of the tieback cylinder 4.
In use of the anti-lift landing liner hanger according to the present embodiment, the initial position of the piston 503 is in an extended state and the plug cap 3 is in a higher position. After the pitching pressure is built, the piston block 531 moves downwards under the action of the pressure, and the piston rod 532 moves downwards along with the piston block, so that the plug cap 3 and the tie-back cylinder 4 are driven to move downwards, and thrust is applied to the suspension mechanism 9, so that the slips 902 are spread, and the sitting and the hanging are completed.
In one embodiment, a ball seat mechanism 6 is disposed below the sitting and hanging driving mechanism 5, the ball seat mechanism 6 includes a cylindrical ball seat body 601, and the upper end of the ball seat body 601 is connected with a hydraulic cylinder 502 and a mandrel 501. Preferably, the upper end of the ball seat body 601 is provided with a protruding ring-shaped cylinder, which extends between the hydraulic cylinder 502 and the mandrel 501, and the outer side of the ring-shaped cylinder is connected with the inner side of the hydraulic cylinder 502, and the inner side of the ring-shaped cylinder is connected with the outer side of the mandrel 501. In this embodiment, a plurality of connection holes 603 for connecting the hydraulic cylinder 502 are provided in the ball seat body 601 in the axial direction, and axially penetrate the ball seat body 601. An expandable ball seat 602 is arranged in the ball seat body 601, and the expandable ball seat 602 is arranged in the middle of the ball seat body 601 and can be matched with the pressure build-up ball 12 to form a seal.
In a preferred embodiment, the space inside the cylinder 502 is divided into two parts, and is divided by the piston block 531, the space above the piston block 531 is a sitting chamber 521, and the space below the piston block 531 is a pressure balancing chamber 522. The mandrel 501 is provided with an upper pressure transmission hole 511 which is arranged along the radial direction, the upper pressure transmission hole 511 is positioned at the upper end of the hydraulic cylinder 502, and the sitting and hanging cavity 521 and a flow channel in the middle of the mandrel 501 can be communicated through the upper pressure transmission hole 511. The pressure balance chamber 522 is communicated with the upper end of the connecting hole 603, and the lower end of the connecting hole 603 is connected with a flow passage in which a lower pressure transfer hole 613 is communicated with the middle part. Wherein expandable ball seat 602 is located between upper transfer pressure hole 511 and lower transfer pressure hole 613.
In the anti-lift forward-hanging liner hanger according to the present embodiment, the space inside the hydraulic cylinder 502 is divided into two parts, the hanging chamber 521 at the upper part of the piston block 531 communicates with the upper pressure transfer hole 511 and thus with the flow passage, and the pressure balance chamber 522 at the lower part of the piston block 531 communicates with the connection hole 603 and the lower pressure transfer hole 613 and thus with the flow passage. Before the pressure-holding ball 12 is put in, the seating chamber 521 and the pressure balance chamber 522 are both connected to the flow path, and the pressure inside the chambers is the same, so that the piston 503 is kept stationary. Thus, it can be ensured that the user can not sit or hang in advance. After the pressure-holding ball 12 is put in, the pressure-holding ball 12 is clamped at the expandable ball seat 602 to block the flow passage, the pressure of the drilling fluid in the flow passage at the upper part of the pressure-holding ball is increased, and the pressure of the fluid is transmitted into the hanging chamber 521 through the pressure transmission hole, so that the piston block 531 is pushed to move downwards, the plug cap 3 and the tieback barrel 4 are driven to move downwards, the slips 902 of the hanging mechanism 9 are pushed to be spread, and the hanging is finished.
In one embodiment, as shown in fig. 2 and 3, the expandable ball seat 602 includes a ball seat support cylinder 604, the ball seat support cylinder 604 is sleeved inside the ball seat body 601, a split ball seat 601 is provided at an upper end of the ball seat support cylinder 604, and the split ball seat 601 includes a plurality of split ball seat blocks 606. The plurality of split ball seat blocks 606 form a cylindrical split ball seat 601 in an enclosing manner, and the upper end of the split ball seat is matched with the pressure build-up ball 12 to seal the flow channel; the lower end of the split ball seat 601 is detachably coupled to the ball seat support cylinder 604.
Preferably, as shown in fig. 4 and 5, the upper end of the split ball seat block 606 is an inclined arc surface to facilitate the pressing of the ball 12 in place, and the lower end is designed with a T-shaped connector 607, the cross section of which is trapezoidal, and the lower end surface is an inclined surface with a certain angle. As shown in fig. 6 and 7, the upper end of the ball seat support tube 604 is also designed with a T-shaped slot 608 which is matched with the ball seat, and the T-shaped connector 607 on the split ball seat block 606 can be placed in the slot 608, so that the axial movement outside the ball seat can be limited. And when the outer surface of the split ball seat block 606 is not limited, it can expand radially along the trapezoidal inclined surface downward under the action of external force. In order to realize static sealing of the ball seat, the outer surface of each split ball seat block 606 is vulcanized rubber or wrapped by soft metal, and the split ball seat blocks 606 and 606, and the split ball seat blocks 606 and the inner surface of the ball seat body 601 are sealed in an interference fit mode.
In this embodiment, the ball seat body 601 is provided with a rectangular groove 609 at the middle portion thereof and a first shear pin sleeve 610 at the lower portion thereof, and the ball seat support cylinder 604 is connected to the first shear pin sleeve 610 through a first shear pin 611. After the ball is thrown, the pressure-retaining ball 12 is connected with the split ball seat 601, the pressure is retained in the upper flow passage, the hydraulic pressure is transmitted into the hydraulic cylinder 502 through the first pressure transmission hole, the pressure in the sitting and hanging cavity 521 is increased, the piston 503 is pushed to move, and then the connecting cylinder 4 and the hanging mechanism 9 are driven to complete the sitting and hanging. After the sitting and hanging are completed, the pressure in the flow passage at the upper part of the split ball seat block 606 and the pressure-building ball 12 is continuously increased, so that the pressure on the ball seat supporting cylinder 604 is increased. When the pressure is increased to a certain value, the first shear pin 611 is sheared off, the split ball seat 601 and the ball seat support cylinder 604 descend, when the split ball seat 601 reaches the rectangular groove 609, the external part loses support, each split ball seat block 606 expands along the radial direction to enter the rectangular groove 609, the pressure-building ball 12 continues to fall after losing support, and therefore the circulation is reestablished.
In one embodiment, the lower end of the ball seat body 601 is provided with a lower joint 612 for limiting the ball seat support cylinder 604, and the lower end of the lower joint 612 is provided with a releasing mechanism 7. Wherein the lower pressure transmission hole 613 is disposed at an upper end of the lower joint 612.
In one embodiment, as shown in fig. 1, the upper end of the mandrel 501 is connected with a lifting joint 1 through a fastening joint 2, and the lifting joint 1 is connected with an upper feeding drill. The lower end of the mandrel 501 is connected with a central tube 10, and the lower end of the central tube 10 is connected with a rubber plug connector 11. The rubber plug joint 11 is connected with a liner cementing rubber plug.
In one embodiment, as shown in fig. 8, the suspension mechanism 9 includes a suspension mechanism body 901, and the suspension mechanism body 901 is a tubular joint sleeved outside the central pipe 10. The slips 902 are fixedly arranged at the lower part of the suspension mechanism body 901, a taper sleeve 906 connected with the suspension mechanism body 901 is arranged above the slips 902, and the taper sleeve 906 is matched with the slips 902. When the drogue 906 and the slips 902 are moved relative to each other, the drogue 906 pushes the slips 902 apart. In this embodiment, a clamp spring sleeve 905 is connected to the upper portion of the taper sleeve 906, and the clamp spring sleeve 905 is connected to the return cylinder 4 through the suspension mechanism connecting cylinder 903. And the clamp spring sleeve 905 is matched with the hanging mechanism body 901 through an anti-withdrawal clamp spring 904.
When the anti-lifting pipe liner hanger according to the embodiment is used, the tieback cylinder 4 is moved downward under the action of the hanging driving mechanism 5, and the tieback cylinder 4 provides downward thrust to the hanging mechanism connecting cylinder 903 and the clamp spring sleeve 905 to drive the taper sleeve 906 to move downward, so that the slips 902 are spread. The anti-retreat snap spring 904 is arranged on the hanging mechanism body 901, and can ensure that the snap spring sleeve 905 only can move downwards but cannot move upwards. In the prior art, the hanging mechanism 9 adopts a taper sleeve 906 to be fixed, and a driving mechanism pushes the slips 902 to move upwards to realize sitting and hanging. And the driving mechanism 5 for preventing the extension pipe hanger from being seated and hung in advance is transferred to the internal running tool, the hanging mechanism 9 adopts a mode that the slips 902 are fixed, and the driving mechanism pushes the tieback cylinder 4 and the taper sleeve 906 to descend, so that the operation of seating and hanging is realized.
In one embodiment, the suspension body 901 is provided with a second shear pin sleeve 907, and the second shear pin sleeve 907 is connected with the suspension body 901 through the shear pins. The upper part of the second shear pin bush 907 is provided with a slip support bush 909, and the slip 902 is fixed on the slip support bush 909. The bottom of the second shear pin sleeve 907 is provided with a centralizer 910. In a preferred embodiment, a sealing cartridge 8 is disposed between the center tube 10 and the suspension mechanism body 901.
When the tail pipe hanger capable of preventing lifting ahead is used, if the problem that the hanging mechanism 9 is hung in advance occurs in the tail pipe running process, the pipe column can be lifted to a certain tonnage, the unlocking shear pins 908 are cut off, and the slips 902 can move downwards, so that the hanging mechanism 9 is unlocked, and the whole pipe string can be lifted out of a wellhead.
In use of the anti-lift landing liner hanger according to the present embodiment, the landing drive mechanism 5 is connected as in figure 1 as the tool is run into the well. At this time, the stopper cap 3 is locked by the retainer ring 31 at the upper end of the tieback cylinder 4 (as shown in fig. 9), the sitting drive mechanism 5 is located inside the tieback cylinder 4, and the separate ball seat 601 is located at the lower end thereof. The pressure in the flow passage can reach the hydraulic hanging chamber 521 and the pressure balance chamber 522 through the first pressure transmission hole, the second pressure transmission hole and the connecting hole 603 respectively, so that the pressures on the two sides of the piston 503 are equal. Therefore, the piston 503 cannot move downwards no matter how much the pressure in the pipe is, so that the pressure balance between the sitting and hanging cavity 521 and the pressure balance cavity 522 cannot be damaged even if abnormal high pressure or high-strength grooves occur in the moving-in process, and the suspension mechanism 9 is prevented from being sat and hung in advance.
After the tail pipe is lowered to the designed depth, the pressure-holding ball 12 is put in, the ball falls to the split ball seat 601, the pressure is held in the pipe, the pressure is transmitted to the hydraulic hanging cavity 521, but the pressure cannot be transmitted to the pressure balance cavity 522 due to the existence of the pressure-holding ball 12. At this time, the hydraulic pressure generated by the hanging cavity 521 makes the piston 503 drive the retainer ring 31, the plug cap 3 and the tieback cylinder 4 to descend, and the tieback cylinder 4 makes the hanging cavity 521 connecting cylinder, the clamp spring sleeve 905, the taper sleeve 906 and other components on the hanging mechanism 9 to descend, so that the slips 902 are expanded radially to realize hanging (as shown in fig. 10).
When the completion of the hanging is judged, the pressure is continuously suppressed, the first shear pin 611 is cut off, the split ball seat 601 and the ball seat support cylinder 604 descend, when the pressure reaches the inner groove of the ball seat body 601, the outer surface of the split ball seat block 606 loses support, expands along the radial direction, enters the rectangular groove 609, and at the moment, the pressure-suppressed ball 12 passes through the ball seat, so that a circulation channel is reestablished, and the subsequent well cementation construction operation can be completed. When the construction is finished, all internal components can be lifted out, leaving only the tieback 4 and the suspension mechanism 9 in the well (as shown in fig. 11).
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, the appended claims are intended to be construed to include preferred embodiments and all such changes and/or modifications as fall within the scope of the invention, and all such changes and/or modifications as are made to the embodiments of the present invention are intended to be covered by the scope of the invention.
Claims (10)
1. A liner hanger for preventing lifting and hanging forward, comprising:
the external device is left in the well after underground construction operation and comprises a suspension mechanism (9) provided with slips (902) and a connecting back cylinder (4) capable of pushing the suspension mechanism (9) to expand the slips (902); and
the internal device is lifted out of a wellhead after underground construction operation and comprises a sitting and hanging driving mechanism (5) connected with the tieback cylinder (4), and the sitting and hanging driving mechanism (5) drives the tieback cylinder (4) to move through hydraulic pressure;
the sitting and hanging driving mechanism (5) keeps pressure balance before the pressure-holding ball (12) is thrown into the seat and hanging driving mechanism so as to be in a locking state, and the sitting and hanging driving mechanism loses the pressure balance after the pressure-holding ball (12) is thrown into the seat and hanging driving mechanism so as to start, so that the connecting back cylinder (4) is pushed to move.
2. The anti-lift sitting and hanging liner hanger as claimed in claim 1, wherein the sitting and hanging driving mechanism (5) comprises a mandrel (501), a hydraulic cylinder (502) is arranged outside the mandrel (501), and a piston (503) is arranged in the hydraulic cylinder (502);
the piston (503) comprises a piston block (531) arranged in the hydraulic cylinder (502) and a piston rod (532) extending above the hydraulic cylinder (502), and the end of the piston rod (532) is provided with a plug cap (3) connected with the return connection cylinder (4).
3. The anti-lift pipe liner hanger according to claim 2, wherein a ball seat mechanism (6) is arranged below the hanging driving mechanism (5), the ball seat mechanism (6) comprises a cylindrical ball seat body (601), and a plurality of connecting holes (603) communicated with the hydraulic cylinder (502) are axially arranged on the wall of the ball seat body (601); and an expandable ball seat (602) matched with the pressure building ball (12) is arranged in the ball seat body (601).
4. The anti-lifting pipe liner hanger of claim 3, wherein the space above the piston block (531) in the hydraulic cylinder (502) is a hanging chamber (521), and the hanging chamber (521) is communicated with a flow channel in the middle through an upper pressure transfer hole (511) arranged on the mandrel (501);
a space below the piston block (531) in the hydraulic cylinder (502) is a pressure balance cavity (522), and the pressure balance cavity (522) is communicated with the connecting hole (603) and is communicated with a flow passage in the middle through a lower pressure transmitting hole (613) arranged at the lower end of the connecting hole (603);
wherein the expandable ball seat (602) is located between the upper and lower pressure transmitting holes (511, 613).
5. The anti-lift landing leg hanger of claim 3 or 4, wherein said expandable ball seat (602) comprises a ball seat support barrel (604), the upper end of said ball seat support barrel (604) being provided with a split ball seat (601); the split ball seat (601) comprises a plurality of split ball seat blocks (606); the upper end of the split ball seat block (606) is matched with the pressure building ball (12), and the lower end of the split ball seat block is detachably connected with the ball seat supporting cylinder (604);
the ball seat supporting barrel (604) is connected with the first shear pin sleeve (610) through a first shear pin (611);
after the seat hanging is finished, the pressure on the upper part of the ball seat supporting barrel (604) pushes and cuts off the first shear pin (611), so that the ball seat supporting barrel (604) descends, and when the split ball seat (601) descends to the position of the rectangular groove (609), the split ball seat loses support and is separated, and is separated from the pressure building ball (12).
6. The anti-lift hitch liner hanger according to claim 5, wherein a lower end of said ball seat body (601) is provided with a lower sub (612), a lower end of said lower sub (612) is provided with a release mechanism (7); wherein the lower pressure transmission hole (613) is provided at an upper end of the lower joint (612).
7. The liner hanger according to claim 6, wherein the upper end of the mandrel (501) is connected with a pull-up sub (1) through a buckle sub (2), and the pull-up sub (1) is connected with a feeding drill above; the lower end of the releasing mechanism (7) is connected with a central tube (10), and the lower end of the central tube (10) is connected with a rubber plug joint (11).
8. Anti-lift landing leg hanger according to any of claims 1 to 7, wherein the suspension mechanism (9) comprises a suspension mechanism body (901) arranged outside the central tube (10), the slips (902) being fixedly arranged in the lower part of the suspension mechanism body (901); the upper part of the suspension mechanism body (901) is provided with a taper sleeve (906) matched with the slip (902), and the taper sleeve (906) is connected with the tieback cylinder (4) through a snap spring sleeve (905) and a suspension mechanism connecting cylinder (903); and the clamp spring sleeve (905) is matched with the hanging mechanism body (901) through an anti-withdrawal clamp spring (904).
9. The anti-lift sit-and-hang liner hanger as claimed in claim 7, wherein the lower part of the hanging mechanism body (901) is connected with a second shear pin sleeve (907) through an unlocking shear pin (908), and the upper part of the second shear pin sleeve (907) is provided with a slip support sleeve (909); the slips (902) are secured to the slip support sleeve (909).
10. An anti-lift landing leg hanger according to claim 7, wherein a sealing cartridge (8) is provided between the central tube (10) and the hanging mechanism body (901).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910636142.XA CN112227994B (en) | 2019-07-15 | 2019-07-15 | Tail pipe hanger preventing lifting forward and hanging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910636142.XA CN112227994B (en) | 2019-07-15 | 2019-07-15 | Tail pipe hanger preventing lifting forward and hanging |
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| Publication Number | Publication Date |
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| CN112227994A true CN112227994A (en) | 2021-01-15 |
| CN112227994B CN112227994B (en) | 2022-08-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910636142.XA Active CN112227994B (en) | 2019-07-15 | 2019-07-15 | Tail pipe hanger preventing lifting forward and hanging |
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| CN (1) | CN112227994B (en) |
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| CN112227994B (en) | 2022-08-12 |
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