CN115263229A - Back-insertable sealing packer and using method thereof - Google Patents
Back-insertable sealing packer and using method thereof Download PDFInfo
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- CN115263229A CN115263229A CN202211133765.3A CN202211133765A CN115263229A CN 115263229 A CN115263229 A CN 115263229A CN 202211133765 A CN202211133765 A CN 202211133765A CN 115263229 A CN115263229 A CN 115263229A
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- piston
- outer sheath
- ring
- sleeve
- sealing
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/128—Packers; Plugs with a member expanded radially by axial pressure
- E21B33/1285—Packers; Plugs with a member expanded radially by axial pressure by fluid pressure
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/129—Packers; Plugs with mechanical slips for hooking into the casing
- E21B33/1295—Packers; Plugs with mechanical slips for hooking into the casing actuated by fluid pressure
Abstract
The invention relates to the technical field of oil field downhole tools, in particular to a back-insertable sealing packer and a using method thereof, wherein the back-insertable sealing packer comprises a setting mechanism, the top of the setting mechanism is connected with a back-insertable mechanism, and the bottom of the setting mechanism is connected with a pressure-bearing mechanism; the packer can finish the maintenance of the upper pipe column without moving the packer setting and unsetting mechanism and the lower pipe column, and meanwhile, the whole structure can be conveniently recycled and salvaged when a well is shut down.
Description
Technical Field
The invention relates to the technical field of oilfield downhole tools, in particular to a back-pluggable sealing packer and a using method thereof.
Background
In recent years, with the continuous deepening and advancing of oil field development work, the difficulty of exploitation is continuously increased, and in the development process of underground operation, frequently occurring safety accidents are concerned and emphasized by all the communities.
When the components on the underground pipe column need to be overhauled or replaced, the whole pipe column consisting of the underground oil pipe and the continuous underground tools needs to be lifted out according to the existing underground pipe column structure, and the pipe column is put into the shaft after the new components are overhauled or replaced.
In the whole process, the packer needs to be unset, and the setting and the seal checking are carried out again after the rubber cylinder and the slips are replaced; the packer is repeatedly unset and set, so that the packer-related setting and unsetting mechanisms bear high-pressure alternating load, the service life of the packer is shortened, the use risk of underground operation is increased, and some underground accidents are caused.
Meanwhile, the packer and the lower tubular column are repeatedly lifted, so that the labor and material cost is consumed, and the operation cost is increased.
In addition, traditional packer is when closing the well at last, and partial pipe fitting can't be taken out, need remain in the well, causes the waste of resource, even this partial pipe fitting can be salvaged, also salvages in batches through modes such as cutting, breakage, and not only takes trouble hard, salvages the effect moreover unsatisfactory.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a back-plugging sealing packer and a using method thereof, wherein the packer can finish the maintenance of an upper pipe column without moving a packer setting and unsetting mechanism and a lower pipe column, and meanwhile, the whole structure can be conveniently recovered and salvaged when a well is shut down.
The technical scheme of the invention is as follows:
a sealing packer capable of being inserted backwards comprises a setting mechanism, wherein the top of the setting mechanism is connected with a backwards-inserting mechanism, and the bottom of the setting mechanism is connected with a pressure-bearing mechanism;
the backward-inserting mechanism comprises a lock claw sleeve, an inserting rod, a first outer sheath, a limiting block, a first sealing ring, a first piston, a second outer sheath and an inserting rod sealing sleeve;
the bottom of the claw sleeve is provided with an elastic claw, the outer side of the lower end of the elastic claw is provided with a limiting protrusion, the lower end of the claw sleeve is inserted into the top cavity of the first outer sheath, a limiting groove matched with the limiting protrusion is formed in the first outer sheath, and the bottom of the first outer sheath is connected with the top of the second outer sheath;
the inserted bar is positioned in the cavity of the locking claw sleeve, the top of the inserted bar is connected with the locking claw sleeve, and the top of the limiting block is positioned between the inserted bar and the elastic claw and used for supporting the limiting protrusion at the bottom of the elastic claw to enter the limiting groove;
the bottom of the first piston is connected in an annular cavity between the inserted link and the first outer sheath in a sliding and sealing mode, a second pin is arranged between the first piston and the first outer sheath, and the top of the first piston and the bottom of the limiting block are provided with clamping hooks which are matched with each other;
the insert rod is provided with a second through hole for transmitting hydraulic power to the first piston, the first sealing ring is sleeved and fixed outside the insert rod and used for sealing an annular space between the insert rod and the first piston, and the insert rod sealing sleeve is sleeved and fixed at the bottom of the insert rod and used for sealing an annular space between the insert rod and the second outer sheath;
the pressure-bearing mechanism comprises a fourth outer sheath, a valve ball, a ball seat and a pressure-bearing plate;
be equipped with the valve pocket that both ends are binding off form in the fourth overcoat, the ball seat is located the valve pocket to the sealed binding off position that inserts the valve pocket top in ball seat top, the guiding gutter has been seted up at the ball seat middle part, ball seat bottom and valve pocket bottom sliding seal are connected to still be connected with the third pin between ball seat and the fourth overcoat, the bearing plate of shutoff inner chamber runner is installed to fourth overcoat body bottom.
Preferably, the setting mechanism comprises a packer joint, an inner sheath, a pressure ring, a connecting cylinder, a third outer sheath, a combined rubber cylinder, a spacer ring, an opening locking ring, a fishing joint, a central pipe, a second sealing ring, a second piston, a third sealing ring, a third piston and a sleeve;
the top of the inner sheath is connected to the bottom in the cavity of the packer joint, the compression ring is sleeved outside the inner sheath, and the top of the compression ring is sleeved at the bottom of the packer joint;
the compression ring, the connecting cylinder, the third outer sheath, the combined rubber cylinder and the spacer ring are sequentially connected from top to bottom;
the upper end of the salvaging connector is in threaded connection with the lower end of the inner sheath, a first pin is connected between the salvaging connector and the pressing ring, the opening locking ring is positioned in an annular space gap formed between the salvaging connector and the connecting cylinder, one-way teeth which are meshed with each other are arranged between the opening locking ring and the salvaging connector, and the top of the central pipe is sleeved inside the salvaging connector and fixed with the salvaging connector through a fourth pin;
the second sealing ring, the second piston, the third sealing ring and the third piston are sequentially arranged in an annular cavity between the central pipe and a third outer sheath from top to bottom, step surfaces matched with the bottoms of the second piston and the third piston are respectively arranged in the third outer sheath, the second sealing ring and the third sealing ring are fixedly connected with the central pipe, and first through holes for pressing the tops of the second piston and the third piston are respectively formed in the central pipe;
the slip sealing connection is in the annular space between center tube and third oversheath in telescopic top sliding seal, the combination packing element is established in telescopic outside with spacer ring sliding sleeve, the lower extreme cover of center tube is equipped with slips mechanism, slips mechanism's top and sleeve bottom fixed connection to through sleeve axial displacement control slips setting and deblocking.
Preferably, the slip mechanism comprises: the clamping device comprises an upper cone, a lower cone, a slip cover, a slip body, a spring piece and a lower cone;
the slip cover is sleeved outside the central pipe, and the upper cone, the slips and the lower cone are sequentially arranged in an annular space between the slip cover and the central pipe from top to bottom;
the slip cover is provided with a through groove for the anchoring part of the slip to extend out, the spring piece is elastically supported between the slip body and the slip cover, the upper end of the upper cone is fixedly connected with the lower end of the sleeve, the upper end of the lower cone is fixedly connected with the central tube, and the lower end of the lower cone is further sleeved with a guide ring.
Preferably, the combined rubber cylinder comprises an upper rubber cylinder and a lower rubber cylinder, the hardness of the upper rubber cylinder is higher than that of the lower rubber cylinder, the upper rubber cylinder and the lower rubber cylinder are integrally formed through vulcanization, and the upper end and the lower end of each rubber cylinder are provided with anti-bulge rings.
A method for using a pluggable sealing packer comprises the following steps:
setting operation
Firstly, connecting an oil pipe with the top of the back-plugging mechanism, and then putting the oil pipe into a well casing to reach the designed depth;
next, a valve ball is thrown in from a well mouth, the valve ball falls onto the ball seat, the flow channel is blocked, then liquid is pumped in from the oil pipe, and the liquid enters a first through hole in the central pipe;
next, the first pin is firstly cut off along with the increase of the pumping pressure, and at the moment, the second piston and the third piston drive the third outer sheath, the connecting cylinder and the pressure ring to start to move downwards and simultaneously extrude the expansion seal of the combined rubber cylinder;
next, the third piston pushes the sleeve to move downwards after pushing the sleeve to move downwards so as to drive the slip to perform setting, meanwhile, the pressing ring moves downwards to drive the opening locking ring to move downwards, and the positions of the third outer sheath, the connecting cylinder, the pressing ring and the sleeve are fixed under the matching of one-way teeth between the opening locking ring and the fishing joint so as to complete setting;
(II) separating operation of the backward inserting mechanism:
firstly, continuously pumping liquid from the oil pipe, wherein the liquid enters an annular space between the first sealing ring and the first piston from the second through hole on the inserted rod, so that the first piston has a downward movement trend;
next, with the further rise of the pressure, a second pin on the first piston and the first outer sheath is sheared off, at the moment, the first piston starts to move downwards and drives the limiting block to move downwards, so that the limiting block is separated from the supporting elastic locking claw, and the locking of the locking claw sleeve is released;
and finally, lifting the pluggable part consisting of the upper joint, the locking claw sleeve, the inserted rod, the limiting block, the first sealing ring, the first piston and the inserted rod sealing sleeve out of the well mouth by the oil lifting pipe to finish the separation operation.
(III) the back-inserting operation of the back-inserting mechanism:
firstly, removing a limiting block, a first sealing ring and a first piston on an insertion rod, then inserting the insertion rod back into a cavity of a part of the re-insertable mechanism in the well, and forming sliding seal between the insertion rod and a second outer sheath through an insertion rod sealing sleeve;
next, continuously pumping liquid from the oil pipe, wherein the liquid cannot flow downwards due to the fact that the liquid is located on the ball seat, the pressure in the pipe column is continuously increased, when the pressure reaches a certain value, the third pin located on the ball seat and the fourth outer sheath is cut off, at the moment, the ball seat moves downwards, and the liquid can pass through the ball seat from a gap between the ball seat and the valve cavity and the flow guide groove;
and drilling the valve ball and the bearing plate, or directly selecting the bearing plate and the valve ball which are made of soluble materials, wherein after the valve ball and the bearing plate are dissolved, the interior of the whole pipe column is completely unblocked to form a production flow channel with a large drift diameter, and then the production operation can be switched.
(IV) shut-in operation
After the production operation is finished and the well needs to be shut down, the pluggable part in the pluggable mechanism is lifted out of the well mouth;
the lower pipe column is butted with the upper end of the first outer sheath, then the pipe column is rotated to disconnect the threads of the inner sheath and the fishing joint, at the moment, the pipe column is lifted, and the residual parts of the reinsertion mechanism, the packer joint and the inner sheath are lifted out of a well mouth;
next, a fishing tool is put in to be in butt joint with the fishing joint, the pipe column is lifted up to cut off the fishing joint and a fourth pin on the central pipe, the pipe column drives the fishing joint and the opening lock ring to move upwards, at the moment, the combined rubber cylinder and the slip mechanism reset, and the expansion seal and the setting seal are released;
and finally, continuously lifting the pipe column, lifting the setting mechanism and the pressure-bearing mechanism out of the wellhead, and finally completing well shut-in.
Compared with the prior art, the invention has the following advantages:
the back-plugging mechanism can be repeatedly used, and the maintenance and the replacement of the upper pipe column can be completed without moving the lower pipe column of the packer;
the setting mechanism has no other functional parts inside, and has full-bore design, large working channel, high construction discharge capacity and difficult formation of sand bridge;
the setting mechanism adopts a double-piston design and a double-pressure holding mechanism design of a ball seat and a pressure bearing plate, so that the setting stability of the tool is improved;
the upper part and the lower part of the combined rubber cylinder are integrally formed by vulcanizing different materials, the hardness of the upper rubber cylinder is higher than that of the lower rubber cylinder, and the upper rubber cylinder mainly plays a supporting role during working, so that the shoulder protrusion is effectively prevented, and the sealing performance of the rubber cylinder is improved.
The invention has more reasonable integral structure and is convenient to recover and salvage the integral structure when the well is closed.
Drawings
FIG. 1 is a schematic structural view of a pluggable mechanism;
FIG. 2 is a schematic structural view of a setting mechanism;
FIG. 3 is a schematic structural view of a pressure-bearing mechanism;
FIG. 4 is a schematic structural diagram of a pluggable portion of the pluggable mechanism;
FIG. 5 is a schematic structural view of a combined rubber cylinder;
in the figure:
1. the coupling comprises an upper joint, 2, a locking claw sleeve, 3, an insert rod, 4, a first outer sheath, 5, a limiting block, 6, a first sealing ring, 7, a first piston, 8, a second outer sheath, 9, an insert rod sealing sleeve, 10 and a coupling;
11. the packer comprises a packer joint 12, a pressure ring 13, an inner sheath 14, a fishing joint 15, a connecting cylinder 16, an opening locking ring 17, a central pipe 18, a second sealing ring 19, a second piston 20 and a third outer sheath;
21. a third sealing ring 22, a third piston 23, a sleeve 24, a combined rubber cylinder 25, a spacer ring 26, an upper cone 27, a slip cover 28, a slip body 29, a spring plate 30 and a lower cone;
31. the guide groove 32, the guide ring 33, the first joint 34, the fourth outer sheath 35, the valve ball 36, the ball seat 37, the second joint 38, the pressure bearing plate 39, the lower joint 40 and the upper rubber cylinder;
41. a lower rubber cylinder 42, an anti-bulge ring 43, a first through hole 44, a second through hole 45, a first pin 46, a second pin 47, a third pin 48, a fourth pin 49, an elastic claw 50 and a limiting bulge;
51. a hook 52 and a valve cavity.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the drawings.
Example 1
Referring to fig. 1 to 4, the back-plugging sealing packer comprises a setting mechanism, wherein the top of the setting mechanism is connected with the back-plugging mechanism through a coupling 10, and the bottom of the setting mechanism is connected with a pressure-bearing mechanism.
The reversible insertion mechanism comprises a lock claw sleeve 2, an insertion rod 3, a first outer sheath 4, a limiting block 5, a first sealing ring 6, a first piston 7, a second outer sheath 8 and an insertion rod sealing sleeve 9.
The top of the locking claw sleeve 2 is connected with an upper joint 1 connected with an upper oil pipe, the bottom of the locking claw sleeve 2 is provided with a plurality of slots, so that an elastic claw 49 structure is formed, and a limiting protrusion 50 is arranged on the outer side of the lower end of the elastic claw 49.
The lower end of the locking claw sleeve 2 is inserted into the top cavity of the first outer sheath 4, a limiting groove matched with the limiting protrusion 50 is formed in the first outer sheath 4, and the bottom of the first outer sheath 4 is connected with the top of the second outer sheath 8.
The inserted bar 3 is positioned in the cavity of the locking claw sleeve 2, the top of the inserted bar is connected with the locking claw sleeve 2, and the top of the limiting block 5 is positioned between the inserted bar 3 and the elastic claw 49 and used for supporting the limiting projection 50 at the bottom of the elastic claw 49 to enter the limiting groove.
The bottom of the first piston 7 is connected in a sliding and sealing manner in an annular cavity between the inserted rod 3 and the first outer sheath 4, a second pin 46 is arranged between the first piston 7 and the first outer sheath 4, and the top of the first piston 7 and the bottom of the limiting block 5 are provided with mutually matched clamping hooks 51.
The inserted bar 3 is provided with a second through hole 44 for transmitting hydraulic power to the first piston 7, the first sealing ring 6 is sleeved and fixed outside the inserted bar 3 and used for sealing the annular space between the inserted bar 3 and the first piston 7, and the inserted bar sealing sleeve 9 is sleeved and fixed at the bottom of the inserted bar 3 and used for sealing the annular space between the inserted bar 3 and the second outer sheath 8.
The bearing mechanism includes a fourth outer jacket 34, a valve ball 35, a ball seat 36, and a bearing plate 38.
The top of the fourth outer sheath 34 is connected with the lower cone 30 through the first joint 33, a valve cavity 52 with two closed ends is arranged in the fourth outer sheath 34, the ball seat 36 is located in the valve cavity 52, the top of the ball seat 36 is sealed and inserted into the closed position of the top of the valve cavity 52, and the opening of the top of the ball seat 36 is matched with the valve ball 35.
The diversion trench 31 has been seted up at the ball seat 36 middle part, and the ball seat 36 bottom is connected with the sliding seal in valve chamber 52 bottom to still be connected with the third pin 47 between ball seat 36 and the fourth outer sheath 34, fourth outer sheath 34 body bottom is connected with the second and connects 37, and the second connects 37 bottom is connected with lower clutch 39, and the second connects 37 and the lower clutch 39 junction pad has bearing plate 38.
Example 2
The embodiment further optimizes the structures of the setting mechanism and the slip mechanism on the basis of the embodiment 1:
referring to fig. 2, the setting mechanism comprises a packer joint 11, an inner sheath 13, a pressure ring 12, a connecting cylinder 15, a third outer sheath 20, a combined rubber cylinder 24, a spacer ring 25, an opening locking ring 16, a fishing joint 14, a central pipe 17, a second sealing ring 18, a second piston 19, a third sealing ring 21, a third piston 22 and a sleeve 23.
The top of inner sheath 13 is connected at the intracavity bottom of packer joint 11, and clamping ring 12 overlaps in the outside of inner sheath 13, and the bottom at packer joint 11 is established to the top cover of clamping ring 12.
The pressure ring 12, the connecting cylinder 15, the third outer sheath 20, the combined rubber cylinder 24 and the spacer ring 25 are sequentially connected from top to bottom.
The upper end of the fishing joint 14 is in threaded connection with the lower end of the inner sheath 13, a first pin 45 is connected between the fishing joint 14 and the pressing ring 12, the opening locking ring 16 is located in an annular space formed between the fishing joint 14 and the connecting cylinder 15, one-way teeth which are meshed with each other are arranged between the opening locking ring 16 and the fishing joint 14, and the top of the central pipe 17 is sleeved inside the fishing joint 14 and is fixed with the fishing joint 14 through a fourth pin 48.
The second sealing ring 18, the second piston 19, the third sealing ring 21 and the third piston 22 are sequentially arranged in the annular cavity between the central pipe 17 and the third outer sheath 20 from top to bottom.
The third outer sheath 20 is internally provided with step surfaces matched with the bottoms of the second piston 19 and the third piston 22 respectively, the second sealing ring 18 and the third sealing ring 21 are fixedly connected with the central pipe 17, and the central pipe 17 is provided with a first through hole 43 for pressing towards the tops of the second piston 19 and the third piston 22 respectively.
The top of sleeve 23 slides sealing connection in the annular space between center tube 17 and third oversheath 20, and combination packing element 24 and spacer ring 25 slip cover are established in the outside of sleeve 23, and the lower extreme cover of center tube 17 is equipped with slips mechanism, and the top and the sleeve 23 bottom fixed connection of slips mechanism to through sleeve 23 axial displacement control slips setting and deblocking.
The slips mechanism includes: an upper cone 26, a lower cone 30, a slip cover 27, a slip body 28, a spring plate 29, and a lower cone 30.
The slip cover 27 is sleeved on the outer side of the central pipe 17, and the upper cone 26, the slips and the lower cone 30 are sequentially arranged from top to bottom in an annular space between the slip cover 27 and the central pipe 17.
One side of the slip body 28 is provided with the anchoring part which is vertical to the slip body 28, the slip cover 27 is provided with a through groove for extending the anchoring part of the slip, the spring piece 29 is elastically supported between the slip body 28 and the slip cover 27, the upper end of the upper cone 26 is fixedly connected with the lower end of the sleeve 23, the upper end of the lower cone 30 is fixedly connected with the central tube 17, when the upper cone 26 and the lower cone 30 move relatively close to each other, the slip body 28 is pushed to move outwards through the conical surface, at the moment, the anchoring part on one side of the slip body 28 extends out of the slip cover 27 and is anchored on the inner wall of the shaft, the lower end of the lower cone 30 is further sleeved with a guide ring 32, and the function of centralizing and guiding is achieved.
In addition, referring to fig. 5, the combined rubber cylinder 24 includes an upper rubber cylinder 40 and a lower rubber cylinder 41, the hardness of the upper rubber cylinder 40 is higher than that of the lower rubber cylinder 41, the upper rubber cylinder 40 and the lower rubber cylinder 41 are integrally formed through vulcanization, and the upper end and the lower end of the rubber cylinder are provided with anti-bulge loops 42.
The upper part and the lower part of the combined rubber cylinder 24 are integrally formed by vulcanization processing of different materials, the hardness of the upper rubber cylinder 40 is higher than that of the lower rubber cylinder 41, and the upper rubber cylinder 40 mainly plays a role in supporting during working, so that shoulder protrusion is effectively prevented, and the sealing performance of the rubber cylinder is improved.
Example 3
The embodiment is a use method of the packer capable of being plugged back, and specifically comprises the following steps:
setting operation:
firstly, connecting an oil pipe with the top of the pluggable mechanism, and then putting the oil pipe into a well casing to reach the designed depth.
Next, the ball 35 is dropped from the wellhead and the ball 35 is dropped onto the seat 36, the flow path is blocked, and then fluid is pumped from the tubing and into the first bore 43 in the base pipe 17.
Next, as the pumping pressure rises, the first pin 45 is firstly cut off, and at this time, the second piston 19 and the third piston 22 drive the third outer sheath 20, the connecting cylinder 15 and the pressure ring 12 to start moving downwards, and simultaneously, the combined rubber cylinder 24 is squeezed to be sealed.
Next, the third piston 22 pushes the sleeve 23 to go down after going down, so as to drive the slip setting, specifically, the sleeve 23 drives the upper cone 26 to go down, the upper cone 26 cooperates with the lower cone 30 to press the slip body 28, so that the anchoring portion of the slip body 28 extends out and is locked on the inner wall of the wellbore casing.
After setting is finished, the annular space between the sleeve and the oil pipe is pressurized, the pressure gauge does not drop obviously, and the combined rubber cylinder 24 is sealed and stable.
In addition, the pressing ring 12 moves downwards to drive the opening locking ring 16 to move downwards, and the positions of the third outer sheath 20, the connecting cylinder 15, the pressing ring 12 and the sleeve 23 are fixed under the matching of the one-way teeth between the opening locking ring 16 and the fishing joint 14, so that the setting is completed.
Example 4
The embodiment is a use method of the packer capable of being plugged back, and specifically comprises the following steps:
(II) separating operation of the backward inserting mechanism:
first, liquid is pumped in from the oil pipe, and the liquid enters the annular space between the first sealing ring 6 and the first piston 7 from the second through hole 44 on the insert rod 3, so that the first piston 7 has a downward movement tendency.
Next, as the pressure further rises, the second pin 46 located on the first piston 7 and the first outer sheath 4 is sheared, at this time, the first piston 7 starts to move downwards, and at the same time, the limiting block 5 is driven to move downwards, so that the limiting block 5 is separated from the supporting elastic locking claw, and the locking of the locking claw sleeve 2 is released.
And finally, lifting the pluggable part consisting of the upper joint 1, the locking claw sleeve 2, the inserted rod 3, the limiting block 5, the first sealing ring 6, the first piston 7 and the inserted rod sealing sleeve 9 out of the well mouth by an oil lifting pipe to complete separation operation.
(III) the back-inserting operation of the back-inserting mechanism:
firstly, after the limiting block 5, the first sealing ring 6 and the first piston 7 on the inserted rod 3 are removed, the inserted rod 3 is inserted back into the cavity of the part of the reinsertion mechanism in the well, and a sliding seal is formed between the inserted rod 3 and the second outer sheath 8 through the inserted rod sealing sleeve 9.
Next, fluid continues to be pumped from the tubing, and as the fluid is seated on the ball seat 36, it cannot flow downward, the pressure in the tubing string increases, and when a certain value is reached, the third pin 47 on the ball seat 36 and the fourth outer jacket 34 shears, and the ball seat 36 moves downward, and fluid can pass through the ball seat 36 from the clearance between the ball seat 36 and the valve cavity 52 and the diversion trench 31.
Next, after the valve ball 35 and the pressure-bearing plate 38 are drilled, or the pressure-bearing plate 38 and the valve ball 35 made of soluble materials are directly selected, after the valve ball and the pressure-bearing plate are dissolved, the interior of the whole pipe column is completely unblocked, a production flow channel with a large drift diameter is formed, and then the production operation can be switched.
The inside of the setting mechanism has no other functional parts, the full-path design, the working channel is large, the construction discharge amount is high, and a sand bridge is not easy to form
Can return and insert mechanism can used repeatedly, and the maintenance and the change of top tubular column can be accomplished to the tubular column under the motionless packer, when upper portion tubular column need clear up or maintain, can directly will return the plug part in the mechanism and propose the well head, more nimble convenience.
Example 5
The embodiment is a use method of the back-insertable sealing packer, and specifically comprises the following steps:
(IV) closing the well:
after the production operation is finished and the well needs to be shut down, the pluggable part in the pluggable mechanism is lifted out of the well head.
The running string is butted with the upper end of the first outer sheath 4, then the string is rotated to disconnect the threads of the inner sheath 13 and the fishing joint 14, at the moment, the string is lifted up, and the residual parts of the pluggable mechanism, the packer joint 11 and the inner sheath 13 are lifted out of the wellhead.
Next, the fishing tool is lowered into abutment with the fishing sub 14, the pipe string is lifted up to shear the fishing sub 14 and the fourth pin 48 on the base pipe 17, the pipe string drives the fishing sub 14 and the split locking ring 16 upward, at which time the combined rubber sleeve 24 and slip mechanism are reset to release the expansion seal and setting seal.
And finally, continuously lifting the pipe column, lifting the setting mechanism and the pressure-bearing mechanism out of the wellhead, and finally completing well shut-in.
According to the invention, the pins with different strengths are selected according to the breaking sequence of the first pin 45, the second pin 46, the third pin 47 and the fourth pin 48.
The packer can complete the maintenance of the upper pipe column without moving the packer setting and unsetting mechanism and the lower pipe column, and meanwhile, the whole structure can be conveniently recovered and salvaged when a well is closed.
Claims (5)
1. The utility model provides a can reinsert sealed packer, includes and sets up a mechanism, its characterized in that: the top of the setting mechanism is connected with a back-plugging mechanism, and the bottom of the setting mechanism is connected with a pressure-bearing mechanism;
the backward-inserting mechanism comprises a locking claw sleeve, an inserting rod, a first outer sheath, a limiting block, a first sealing ring, a first piston, a second outer sheath and an inserting rod sealing sleeve;
the bottom of the locking claw sleeve is provided with an elastic claw, the outer side of the lower end of the elastic claw is provided with a limiting protrusion, the lower end of the locking claw sleeve is inserted into the top cavity of the first outer sheath, a limiting groove matched with the limiting protrusion is formed in the first outer sheath, and the bottom of the first outer sheath is connected with the top of the second outer sheath;
the inserted bar is positioned in the cavity of the locking claw sleeve, the top of the inserted bar is connected with the locking claw sleeve, and the top of the limiting block is positioned between the inserted bar and the elastic claw and used for supporting the limiting protrusion at the bottom of the elastic claw to enter the limiting groove;
the bottom of the first piston is connected in an annular cavity between the inserted link and the first outer sheath in a sliding and sealing manner, a second pin is arranged between the first piston and the first outer sheath, and the top of the first piston and the bottom of the limiting block are provided with clamping hooks which are matched with each other;
the insert rod is provided with a second through hole for transmitting hydraulic power to the first piston, the first sealing ring is sleeved and fixed outside the insert rod and used for sealing an annular space between the insert rod and the first piston, and the insert rod sealing sleeve is sleeved and fixed at the bottom of the insert rod and used for sealing an annular space between the insert rod and the second outer sheath;
the pressure bearing mechanism comprises a fourth outer sheath, a valve ball, a ball seat and a pressure bearing plate;
be equipped with the valve pocket that both ends are binding off form in the fourth overcoat, the ball seat is located the valve pocket to the sealed binding off position that inserts the valve pocket top in ball seat top, the guiding gutter has been seted up at the ball seat middle part, ball seat bottom and valve pocket bottom sliding seal are connected to still be connected with the third pin between ball seat and the fourth overcoat, the bearing plate of shutoff inner chamber runner is installed to fourth overcoat body bottom.
2. A reverse plug seal packer as claimed in claim 1, wherein: the setting mechanism comprises a packer joint, an inner sheath, a pressure ring, a connecting cylinder, a third outer sheath, a combined rubber cylinder, a spacer ring, an opening locking ring, a fishing joint, a central pipe, a second sealing ring, a second piston, a third sealing ring, a third piston and a sleeve;
the top of the inner sheath is connected to the bottom in the cavity of the packer joint, the pressure ring is sleeved outside the inner sheath, and the top of the pressure ring is sleeved at the bottom of the packer joint;
the compression ring, the connecting cylinder, the third outer sheath, the combined rubber cylinder and the spacer ring are sequentially connected from top to bottom;
the upper end of the salvaging connector is in threaded connection with the lower end of the inner sheath, a first pin is connected between the salvaging connector and the pressing ring, the opening locking ring is positioned in an annular space gap formed between the salvaging connector and the connecting cylinder, one-way teeth which are meshed with each other are arranged between the opening locking ring and the salvaging connector, and the top of the central pipe is sleeved inside the salvaging connector and fixed with the salvaging connector through a fourth pin;
the second sealing ring, the second piston, the third sealing ring and the third piston are sequentially arranged in an annular cavity between the central pipe and a third outer sheath from top to bottom, step surfaces matched with the bottoms of the second piston and the third piston are respectively arranged in the third outer sheath, the second sealing ring and the third sealing ring are fixedly connected with the central pipe, and first through holes for pressing the tops of the second piston and the third piston are respectively formed in the central pipe;
the slip sealing connection is in the annular space between center tube and third oversheath in telescopic top sliding seal, the combination packing element is established in telescopic outside with spacer ring sliding sleeve, the lower extreme cover of center tube is equipped with slips mechanism, slips mechanism's top and sleeve bottom fixed connection to through sleeve axial displacement control slips setting and deblocking.
3. A reverse plug seal packer as claimed in claim 2, wherein: the slip mechanism includes: the clamping device comprises an upper cone, a lower cone, a slip cover, a slip body, a spring piece and a lower cone;
the slip cover is sleeved outside the central pipe, and the upper cone, the slip and the lower cone are sequentially arranged from top to bottom and are arranged in an annular space between the slip cover and the central pipe;
the slip cover is provided with a through groove for the anchoring part of the slip to extend out, the spring piece is elastically supported between the slip body and the slip cover, the upper end of the upper cone is fixedly connected with the lower end of the sleeve, the upper end of the lower cone is fixedly connected with the central tube, and the lower end of the lower cone is further sleeved with a guide ring.
4. A reverse plug seal packer as claimed in claim 2, wherein: the combined rubber cylinder comprises an upper rubber cylinder and a lower rubber cylinder, the hardness of the upper rubber cylinder is higher than that of the lower rubber cylinder, the upper rubber cylinder and the lower rubber cylinder are integrally formed through vulcanization, and the upper end and the lower end of each rubber cylinder are provided with anti-bulge rings.
5. Use of a retrievable seal packer according to any one of claims 2 to 4, including the steps of:
the method comprises the following steps of (I) setting operation:
firstly, connecting an oil pipe with the top of the back-plugging mechanism, and then putting the oil pipe into a well casing to reach the designed depth;
next, a valve ball is thrown in from a well mouth, the valve ball falls onto the ball seat, the flow channel is blocked, then liquid is pumped in from the oil pipe, and the liquid enters a first through hole in the central pipe;
next, the first pin is firstly cut off along with the rise of the pumping pressure, and at the moment, the second piston and the third piston drive the third outer sheath, the connecting cylinder and the pressing ring to start to move downwards and simultaneously extrude the expansion seal of the combined rubber cylinder;
next, the third piston pushes the sleeve to move downwards after pushing the sleeve to move downwards so as to drive the slip to perform setting, meanwhile, the pressing ring moves downwards to drive the opening locking ring to move downwards, and the positions of the third outer sheath, the connecting cylinder, the pressing ring and the sleeve are fixed under the matching of one-way teeth between the opening locking ring and the fishing joint so as to complete setting;
(II) separating operation of the back-plugging mechanism:
firstly, continuously pumping liquid from the oil pipe, wherein the liquid enters an annular space between the first sealing ring and the first piston from the second through hole on the inserted rod, so that the first piston has a downward movement trend;
next, with further rise of the pressure, a second pin on the first piston and the first outer sheath is sheared off, at the moment, the first piston starts to move downwards and drives the limiting block to move downwards, so that the limiting block is separated from the supporting elastic locking claw, and the locking of the locking claw sleeve is released;
finally, lifting the pluggable part consisting of the upper joint, the locking claw sleeve, the inserted rod, the limiting block, the first sealing ring, the first piston and the inserted rod sealing sleeve out of the well mouth by the oil lifting pipe to finish the separation operation;
(III) the back-inserting operation of the back-inserting mechanism:
firstly, removing a limiting block, a first sealing ring and a first piston on an insertion rod, then inserting the insertion rod back into a cavity of a part of the re-insertable mechanism in the well, and forming sliding seal between the insertion rod and a second outer sheath through an insertion rod sealing sleeve;
next, continuously pumping liquid from the oil pipe, wherein the liquid cannot flow downwards due to the fact that the liquid is located on the ball seat, the pressure in the pipe column is continuously increased, when the pressure reaches a certain value, the third pin located on the ball seat and the fourth outer sheath is cut off, the ball seat moves downwards at the moment, and the liquid can pass through the ball seat from a gap between the ball seat and the valve cavity and the flow guide groove;
drilling the valve ball and the bearing plate, or directly selecting the bearing plate and the valve ball which are made of soluble materials, wherein after the valve ball and the bearing plate are dissolved, the interior of the whole pipe column is completely unblocked to form a production flow channel with a large drift diameter, and then the production operation can be switched;
(IV) closing the well:
after the production operation is finished and the well needs to be shut down, the pluggable part in the pluggable mechanism is lifted out of the well mouth;
the lower pipe column is in butt joint with the upper end of the first outer sheath, then the pipe column is rotated to enable the threads of the inner sheath and the fishing joint to be disengaged, at the moment, the pipe column is lifted upwards, and the residual parts of the pluggable mechanism, the packer joint and the inner sheath are lifted out of a well mouth;
next, a fishing tool is put into the central pipe to be in butt joint with the fishing joint, the pipe column is lifted to cut off the fishing joint and a fourth pin on the central pipe, the pipe column drives the fishing joint and the opening locking ring to move upwards, and at the moment, the combined rubber cylinder and the slip mechanism reset to release expansion seal and setting seal;
and finally, continuously lifting the pipe column, lifting the setting mechanism and the pressure-bearing mechanism out of the wellhead, and finally completing well shut-in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211133765.3A CN115263229B (en) | 2022-09-19 | 2022-09-19 | Sealing packer capable of being inserted backwards and using method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211133765.3A CN115263229B (en) | 2022-09-19 | 2022-09-19 | Sealing packer capable of being inserted backwards and using method thereof |
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| CN115263229A true CN115263229A (en) | 2022-11-01 |
| CN115263229B CN115263229B (en) | 2023-01-17 |
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|---|---|
| CN115263229B (en) | 2023-01-17 |
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