CN111749643A - Integrated drillable squeezing bridge plug - Google Patents
Integrated drillable squeezing bridge plug Download PDFInfo
- Publication number
- CN111749643A CN111749643A CN202010624893.2A CN202010624893A CN111749643A CN 111749643 A CN111749643 A CN 111749643A CN 202010624893 A CN202010624893 A CN 202010624893A CN 111749643 A CN111749643 A CN 111749643A
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- China
- Prior art keywords
- sleeve
- rubber cylinder
- sliding sleeve
- cone
- slips
- Prior art date
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- 238000007789 sealing Methods 0.000 claims abstract description 37
- 238000002347 injection Methods 0.000 claims abstract description 26
- 239000007924 injection Substances 0.000 claims abstract description 26
- 238000003780 insertion Methods 0.000 claims abstract description 24
- 230000037431 insertion Effects 0.000 claims abstract description 24
- 239000007788 liquid Substances 0.000 claims abstract description 18
- 210000000078 claw Anatomy 0.000 claims description 25
- 238000012856 packing Methods 0.000 claims description 9
- 230000001681 protective effect Effects 0.000 claims description 7
- 230000000903 blocking effect Effects 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 5
- 238000005553 drilling Methods 0.000 abstract description 9
- 239000000463 material Substances 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 2
- 239000004568 cement Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 9
- 238000001125 extrusion Methods 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 239000002002 slurry Substances 0.000 description 5
- 125000006850 spacer group Chemical group 0.000 description 5
- 239000000243 solution Substances 0.000 description 3
- 239000011324 bead Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910001141 Ductile iron Inorganic materials 0.000 description 1
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/134—Bridging plugs
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/127—Packers; Plugs with inflatable sleeve
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention belongs to the technical field of oil exploitation underground operation tools, and particularly relates to an integrated drillable squeeze bridge plug which comprises an upper joint, a setting mechanism, slips, a rubber cylinder, a central pipe, an insertion pipe and a sealing sliding sleeve assembly matched with the insertion pipe. The invention adopts the integral design of the insertion pipe and the bridge plug, thereby saving the operation time and the operation cost. In the invention, the part lost in the well is completely made of drillable materials, the slips are positioned on the upper side of the rubber cylinder, and the slips are directly contacted with the slips during drilling, so that the drilling is convenient, the downward pressure resistance is high, and the operation is safer. The lower end of the invention is provided with a floating piston which can assist the closing of the sealing sliding sleeve component, during normal operation, the lifting cannula can drive the sliding sleeve to forcibly move upwards to close the liquid passing channel on the injection sleeve, and when the liquid passing channel is closed, the floating piston can be pushed to move to promote the closing of the sealing sliding sleeve component due to the high pressure of the lower end of the bridge plug.
Description
Technical Field
The invention relates to the technical field of oil exploitation underground operation tools, in particular to a drillable bridge plug for squeeze cement operation in a vertical well and an inclined well.
Background
At present, the domestic oil field is developed in the middle and later stages, many oil-water wells are exploited for decades, underground casings have a large amount of damages, the outer layers of the casings are communicated, production layers are exhausted, old wells are sealed, and the like, squeeze injection of cement is the most important technological means, the existing cement squeeze scheme mainly comprises cement squeeze injection through an oil pipe, the oil pipe is placed into the upper portion of an interval, cement is injected into the oil pipe, the process is simple, but a high-pressure layer cannot be injected, and the interlayer cannot be injected in a circulating mode, and only simple well sealing is adapted; for high pressure injection wells, the currently used process is: the bridge plug is released and lifted up at the upper end of an injection layer through the bridge plug under the pipe column, and then the insertion pipe is put into the butt joint with the bridge plug for sealing, and the main problem of the process is that: 1. two times of running the pipe column are needed, so that the operation time is seriously influenced, and the operation cost is wasted; 2. the bridge plug has two types of fishing and drilling, the fishing bridge plug cannot adapt to the extrusion of an outer channeling layer of the sleeve, the overhaul of an oil-water well is easily caused, the bridge plug with a drilling structure protects the bridge plug from action through shear pins, and the shear pins are easily sheared after being scraped by a well wall in the process of going into the well, so that the bridge plug is prevented from being seated in advance.
Disclosure of Invention
The invention aims to solve the technical problem of providing an integrated drillable squeeze bridge plug which saves the operation cost and the operation time and has high pressure resistance.
The technical problem solved by the invention is realized by adopting the following technical scheme:
the invention comprises an upper joint, a setting mechanism, slips, a rubber cylinder and a central tube, and also comprises an insertion tube and a sealing sliding sleeve assembly matched with the insertion tube;
the sitting sealing mechanism comprises a retaining ring, a connecting sleeve, an auxiliary piston, a clamping block, a protective shear pin, a main piston, a lifting sleeve and a cylinder barrel, wherein the retaining ring, the connecting sleeve and the lifting sleeve are sequentially connected through threads from top to bottom, a radial through hole for mounting the clamping block is processed on the connecting sleeve, the clamping block is mounted in the radial through hole, one side of the clamping block abuts against the main piston, the other side of the clamping block extends into a groove in the outer wall of the center pipe, so that the connecting sleeve is locked on the center pipe under the action of the clamping block, the main piston is slidably mounted on the outer cylindrical surface of the lifting sleeve, the auxiliary piston is slidably mounted on the outer cylindrical surface of the connecting sleeve, the lower end of the auxiliary piston is connected with the upper end of the main piston through the protective shear pin, the inner side of the lower end of an upper joint is connected on the center pipe through threads, and the, the cylinder barrel is sleeved on the outer side of the upper joint, the upper side of the cylinder barrel is limited and locked by the upper back cap at the upper joint, the lower side of the cylinder barrel is limited by a shoulder on the outer side of the upper joint, and the central pipe and the connecting sleeve are both provided with liquid passing holes;
the lower end of the stripping sleeve is connected with a rubber cylinder shaft, the stripping sleeve and the rubber cylinder shaft are connected through a setting shear pin, the slip and the rubber cylinder are both arranged on the outer side of the rubber cylinder shaft, an upper cone and a lower cone are respectively arranged on the upper side and the lower side of the slip, the upper cone and the lower cone are both sleeved on the rubber cylinder shaft, the lower end of the upper cone and the upper end of the lower cone are wedged between the slip and the rubber cylinder shaft through conical surfaces, an annular groove is processed on the inner side of the upper cone, a locking spring is arranged in the annular groove, one-way stopping threads are arranged on the inner side of the locking spring and the outer side of the rubber cylinder shaft, the upper end of the rubber cylinder abuts against the lower end of the lower cone, a lower pressing ring is arranged on the lower end of the rubber cylinder, and;
the insertion pipe is connected to the lower end of the central pipe through threads;
a sealing structure is arranged between the lower end of the central tube and the rubber cylinder shaft;
the sealing sliding sleeve assembly comprises a sliding sleeve, an injection sleeve, a sealing ring, a floating piston and a lower back cap, wherein the upper end of the injection sleeve is connected to the lower end of the lower pressure ring through threads, the sealing ring is clamped between the lower end of the rubber sleeve shaft and the upper end of the injection sleeve, the sliding sleeve is slidably mounted on the inner sides of the rubber sleeve shaft and the injection sleeve, the floating piston is slidably mounted in the injection sleeve, the lower back cap is connected to the lower end of the injection sleeve through threads, the lower side of the floating piston is limited through the lower back cap, and liquid passing holes are formed in the sliding sleeve and the injection sleeve;
the upper end of sliding sleeve is processed there is elasticity claw A, and elasticity claw A's end is provided with joint portion, and is footpath, and the inner wall of packing element axle is spacing in the outside of joint portion, and in the axial, the downside of joint portion is spacing through processing the circular bead on packing element axle inner wall, the outside of intubate lower extreme is provided with and is used for blocking from the inboard the circular bead of joint portion.
As a further technical scheme, the upper end of the main piston is provided with an elastic claw B, the tail end of the elastic claw B is provided with a clamping portion, the outer side of the clamping portion is limited by the inner wall of the auxiliary piston in the radial direction, the inner side of the clamping portion is limited by a shoulder machined on the outer wall of the connecting sleeve, and the lower side of the clamping portion is limited by the shoulder in the axial direction.
As a further technical scheme, the upper end of the upper cone is provided with an elastic claw C, the tail end of the elastic claw C is provided with a clamping portion, the outer side of the clamping portion is limited by the inner wall of the main piston in the radial direction, the inner side of the clamping portion is limited by a shoulder machined on the outer wall of the lifting sleeve, and the lower side of the clamping portion is limited by the shoulder in the axial direction.
The invention has the beneficial effects that:
1. the invention adopts the integral design of the insertion pipe and the bridge plug, thereby saving the operation time and the operation cost.
2. The main piston and the auxiliary piston of the setting part are in self-balance after the setting of the tool is finished, a pipe column is not jacked, and the reliable sealing of the insertion pipe is guaranteed.
3. In the invention, the part lost in the well is completely made of drillable materials, the slips are positioned on the upper side of the rubber cylinder, and the slips are directly contacted with the slips during drilling, so that the drilling is convenient, the downward pressure resistance is high, and the operation is safer.
4. The lower end of the invention is provided with a floating piston which can assist the closing of the sealing sliding sleeve component, during normal operation, the lifting cannula can drive the sliding sleeve to forcibly move upwards to close the liquid passing channel on the injection sleeve, and when the liquid passing channel is closed, the floating piston can be pushed to move to promote the closing of the sealing sliding sleeve component due to the high pressure of the lower end of the bridge plug.
5. The inserting pipe of the bridge plug is connected with the central pipe, after the setting operation is performed, the setting shear pin is cut off, the main piston and the auxiliary piston move oppositely and are connected and limited through the lifting sleeve and the connecting sleeve, so that the high pressure in the extrusion process cannot push the oil pipe, the inserting pipe is prevented from being separated from the inner cavity of the rubber cylinder shaft, the inserting pipe and the setting part are directly connected and are provided with sealing sleeves, after the setting operation, the pipe column can be directly lifted or not moved, the next step of extrusion operation can be directly performed, and the pipe column, the inserting pipe and the like are lifted out of the well after the setting operation is completed.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is an enlarged view of a portion of FIG. 1 at B;
FIG. 4 is an enlarged view of a portion of FIG. 1 at C;
FIG. 5 is a schematic view of the primary piston;
FIG. 6 is a schematic structural view of the upper cone;
FIG. 7 is a schematic structural view of a sealing sliding sleeve;
FIG. 8 is a cross-sectional view at D in FIG. 5, E in FIG. 6, or F in FIG. 7;
FIG. 9 is an enlarged view of a portion of FIG. 1 at G;
FIG. 10 is a schematic structural view of another embodiment of the cartridge of the present invention;
FIG. 11 is a schematic structural view of a support sleeve;
FIG. 12 is a cross-sectional view taken at H in FIG. 11;
figure 13 is a cross-sectional view of the support sleeve at the angle shown in figure 11.
In the figure, an upper joint 1, an upper back cap 2, a cylinder barrel 3, a central pipe 4, a baffle ring 5, a connecting sleeve 6, an auxiliary piston 7, a clamping block 8, a protective shear pin 9, an elastic claw A10, a main piston 11, a lifting sleeve 12, a setting shear pin 13, an upper cone 14, a locking spring 15, a spacer ring 16, a sealing sleeve 17, a slip 18, an insertion pipe 19, a lower cone 20, a rubber cylinder 21, a rubber cylinder shaft 22, a sliding sleeve 23, a lower pressing ring 24, a sealing ring 25, an injection sleeve 26, a floating piston 27, a lower back cap 28, a shoulder 29, a clamping part 30, an elastic claw B31, an elastic claw C32, a liquid passing hole 33, a spacer ring 34, a rubber cylinder outer ring groove 35, a supporting sleeve 36, a cutting slit 37 and a supporting sleeve inner ring groove 38.
Detailed Description
The technical scheme of the invention is further explained by combining the accompanying drawings as follows:
as shown in fig. 1, the present embodiment includes an upper joint 1, a setting mechanism, a slip 18, a rubber cylinder 21 and a central pipe 4, which are structures commonly used in the prior art and are not described herein again.
The innovation of the invention is that: also comprises a cannula 19 and a sealing sliding sleeve component matched with the cannula 19. By organically combining the insertion pipe 19 with the bridge plug tool, the invention only needs to put in one time of the pipe column when the cement is squeezed and injected, and the prior art only needs to put in two times of the pipe column to finish the squeezing and injecting process, so the operation time and the operation cost can be greatly saved by applying the invention.
As shown in fig. 1 and 2, the setting mechanism of the present invention includes a retainer ring 5, a connecting sleeve 6, an auxiliary piston 7, a clamping block 8, a protective shear pin 9, a main piston 11, a lifting sleeve 12 and a cylinder 3, wherein the retainer ring 5, the connecting sleeve 6 and the lifting sleeve 12 are sequentially connected by a thread from top to bottom, a radial through hole for installing the clamping block 8 is processed on the connecting sleeve 6, the clamping block 8 is installed in the radial through hole, one side of the clamping block 8 abuts against the main piston 11, the other side of the clamping block 8 extends into a groove on the outer wall of the central tube 4, so that the connecting sleeve 6 is locked on the central tube 4 under the action of the clamping block 8, the main piston 11 is slidably installed on the outer cylindrical surface of the lifting sleeve 12, the auxiliary piston 7 is slidably installed on the outer cylindrical surface of the connecting sleeve 6, the lower end of the auxiliary piston 7 is connected with the upper end of the main piston 11 through the protective, the inner side of the lower end of the upper joint 1 is connected to the central tube 4 through threads, the outer side of the upper joint 1 is connected with the upper back cap 2 through threads, the cylinder barrel 3 is sleeved on the outer side of the upper joint 1, the upper side of the cylinder barrel 3 is limited and locked through the upper back cap 2, the lower side of the cylinder barrel 3 is limited through a shoulder 29 on the outer side of the upper joint 1, and the central tube 4 and the connecting sleeve 6 are both provided with liquid passing holes 33.
The setting mechanism adopts a double-piston structure, the main piston 11 and the auxiliary piston 7 of the setting part are in a pressure self-balancing state after the setting of the tool is finished, and the pressure cannot act on the central tube 4, so that a tubular column cannot be jacked, and the reliable sealing of the insertion tube 19 is ensured. Specifically, an insertion pipe 19 of the bridge plug is connected with a central pipe 4, after the bridge plug is pressed and set in operation, a setting shear pin 13 is cut off, a main piston 11 and an auxiliary piston 7 move oppositely and are connected and limited through a lifting sleeve 12 and a connecting sleeve 6, high pressure in the extrusion process is prevented from jacking an oil pipe, the insertion pipe 19 is prevented from being separated from an inner cavity of a rubber sleeve shaft 22, the insertion pipe 19 is directly connected with a setting part and is provided with a sealing structure, after the bridge plug is set, the pipe column can be directly lifted or is not moved, next extrusion operation can be directly carried out, and after the bridge plug is lifted, the pipe column and the insertion pipe are lifted out of a well.
The lower end of the stripping sleeve 12 is connected with a rubber barrel shaft 22, the stripping sleeve and the rubber barrel shaft are connected through a setting shear pin 13, the slip 18 and the rubber barrel 21 are both installed on the outer side of the rubber barrel shaft 22, an upper cone 14 and a lower cone 20 are respectively arranged on the upper side and the lower side of the slip 18, the upper cone 14 and the lower cone 20 are both sleeved on the rubber barrel shaft 22, the lower end of the upper cone 14 and the upper end of the lower cone 20 are wedged between the slip 18 and the rubber barrel shaft 22 through conical surfaces, an annular groove is processed on the inner side of the upper cone 14, a locking spring 15 is installed in the annular groove, one-way retaining threads are respectively arranged on the inner side of the locking spring 15 and the outer side of the rubber barrel shaft 22, the upper end of the rubber barrel 21 abuts against the lower end of the lower cone 20, a lower pressing ring 24 is arranged on the lower end of the rubber barrel 21, and the inner side of;
the insertion tube 19 is connected to the lower end of the central tube 4 through threads;
a sealing structure is arranged between the lower end of the central tube 4 and the rubber sleeve shaft 22, and in specific implementation, the sealing structure can comprise a steel spacer ring 16 and two sealing sleeves 17 made of rubber materials, and the two sealing sleeves 17 are respectively arranged on two sides of the spacer ring 16.
Sealed sliding sleeve subassembly, including sliding sleeve 23, pour into cover 26, sealing ring 25, floating piston 27 and lower back of the body cap 28, wherein, the upper end of pouring into cover 26 is passed through threaded connection and is in the lower extreme of lower clamping ring 24, sealing ring 25 clamp between the lower extreme of packing element axle 22 and the lower end of pouring into the cover 26, sliding sleeve 23 slidable mounting is in packing element axle 22 and the inboard of pouring into cover 26, floating piston 27 slidable mounting is in pouring into cover 26, and lower back of the body cap 28 passes through threaded connection and is pouring into the lower extreme of cover 26, and floating piston 27's downside is spacing through lower back of the body cap 28, all be provided with liquid passing hole 33 on sliding sleeve 23 and the pouring into cover 26. The lower end of the invention is provided with a floating piston 27 which can assist the closing of the sealing sliding sleeve component, during normal operation, the lifting cannula 19 can drive the sliding sleeve 23 to forcibly move upwards to close the liquid passing channel on the injection sleeve 26, and when the liquid passing channel is closed, the floating piston 27 can be pushed to move to promote the closing of the sealing sliding sleeve component due to the high pressure of the lower end of the bridge plug.
The upper end of sliding sleeve 23 is processed there is elastic claw A10, and elastic claw A10's end is provided with joint portion 30, and radially, the outside of joint portion 30 is spacing through the inner wall of packing element axle 22, and in the axial, the downside of joint portion 30 is spacing through processing shoulder 29 on packing element axle 22 inner wall, the outside of intubate 19 lower extreme is provided with and is used for blocking from the inboard shoulder 29 of joint portion 30.
The using process of the invention is as follows:
1. the integrated fishable, drillable and squeeze bridge plug is lowered into a preset underground position through an oil pipe column;
2. pressing the ground into the oil pipe column to seat the slips 18 and the rubber cylinder 21 on the integrated fishable, drillable and squeeze bridge plug and release the connection between the central pipe 4 and the connecting sleeve 6;
3. lowering the oil pipe column again, driving the insertion pipe to slide downwards by the central pipe 4 connected with the oil pipe column, inserting the lower end of the insertion pipe 19 into the inner side of the elastic claw A10 and pushing the sliding sleeve 23 to move downwards, and then communicating the two liquid passing holes 33 in the sealing sliding sleeve assembly, so as to open a liquid passing channel;
4. injecting cement slurry into the oil pipe column, wherein the cement slurry reaches the outside of the injection sleeve 26 through a liquid passage in the sealing sliding sleeve assembly to realize the squeezing and injection of the cement slurry, and after the squeezing and injection of the cement is finished, the displacement liquid is injected into the top of the cement slurry, so that the cement slurry is discharged from the oil pipe column and the integrated fishable drillable squeezing and injection bridge plug;
5. lifting the oil pipe column, wherein the shoulder 29 at the lower end of the insertion pipe 19 clamps the clamping part 30 on the elastic claw A10 from the inner side and drives the sliding sleeve 23 to move upwards, so that the liquid passing channel in the sealing sliding sleeve assembly is closed, the oil pipe column is continuously lifted, and the insertion pipe 19 is separated from the sliding sleeve 23;
6. the central tube 4 is pressed, the pressure reaches the shear limit of the setting shear pin 13, the setting shear pin 13 is sheared, and then the upper part of the rubber sleeve shaft 22 and the insertion tube 19 are lifted to the ground together by pulling out the tubing string. It should be noted that, the part lost in the well can be made of drillable material (preferably nodular cast iron) completely, so as to facilitate drilling and removing the components left in the well under the condition that the components cannot be salvaged, the slips 18 are positioned on the upper side of the rubber barrel 21, and the slips 18 are directly contacted during drilling and removing, so that the drilling and removing are facilitated, the downward pressure resistance is high, and the operation is safer.
As a further technical solution, the upper end of the main piston 11 is provided with an elastic claw B31, the end of the elastic claw B31 is provided with a clamping portion 30, the outer side of the clamping portion 30 is limited by the inner wall of the sub piston 7 in the radial direction, the inner side of the clamping portion 30 is limited by a shoulder 29 formed on the outer wall of the connecting sleeve 6, and the lower side of the clamping portion 30 is limited by the shoulder 29 in the axial direction. In the above structure, the elastic claw B31 can firmly lock the main piston 11 to the connecting sleeve 6.
As a further technical solution, an elastic claw C32 is formed at the upper end of the upper cone 14, a snap-in portion 30 is formed at the end of the elastic claw C32, the outer side of the snap-in portion 30 is limited by the inner wall of the main piston 11 in the radial direction, the inner side of the snap-in portion 30 is limited by a shoulder 29 formed on the outer wall of the lifting sleeve 12, and the lower side of the snap-in portion 30 is limited by the shoulder 29 in the axial direction. The upper cone 14 can be kept in a locked state before setting by the elastic claw C32 and released after the setting process is started, so that the slips 18 are always in a state closest to the rubber cylinder shaft 22 (namely, in a state of minimum outer diameter) during transportation and downhole of the invention, and the slips 18 are prevented from being damaged or falling off by external force during the downhole.
As a further technical solution, as shown in fig. 10-13, the rubber cylinder can also adopt another embodiment: in the present embodiment, a support sleeve is disposed between the rubber cylinder 21 and the rubber cylinder shaft 22, when the two end faces of the rubber cylinder 21 are compressed, the end faces of the support sleeve 36 are also compressed synchronously and bulge outwards, so as to provide a support force on the inner side of the rubber cylinder 21, increasing the contact pressure between the rubber cylinder 21 and the inner wall of the casing, and the increase of the contact pressure means a great increase in the pressure bearing capacity of the rubber cylinder 21.
As shown in fig. 11-13, the supporting sleeve 36 is provided with a plurality of slots 37 with length directions along the axial direction of the supporting sleeve 36, and any two adjacent slots 37 are cut along opposite axial feed directions, which not only ensures that the two end surfaces of the supporting sleeve 36 are smoothly bulged after bearing pressure, but also makes the supporting sleeve 36 still be a whole. In specific implementation, the number of the support sleeves 36 in one rubber cylinder 21 may be one, or two, three or more, two adjacent support sleeves 36 are separated by the spacer ring 36, and the number of the support sleeves 36 means the number of the bulges supported by the support sleeves 36 on the outer side of the rubber cylinder 21. Theoretically, the larger the number of the ridges, the stronger the pressure-bearing capacity of the rubber tube 21, in the case of other factors being fixed. In addition, in the case where the axial dimension of the rubber sleeve 21 is constant, the smaller the axial dimension of each support sleeve 36 is, the higher the support strength of the support sleeve 36 is.
In order to make the support sleeve 36 deform directionally when compressed, a support sleeve inner annular groove 38 may be formed on the inner side of the support sleeve 36, and the cross section of the support sleeve inner annular groove 38 is circular arc.
And a rubber cylinder outer ring groove 35 can be arranged at the position, corresponding to the spacing ring 34, on the outer side of the rubber cylinder 21, and the cross section of the rubber cylinder outer ring groove 35 is in a circular arc shape.
In particular, the support sleeve 36 may be made of spring steel, which not only ensures that the support sleeve 36 can provide sufficient support force, but also effectively prevents the support sleeve 36 from being crushed or irreversibly plastically deformed.
Claims (3)
1. The utility model provides an integral type can bore crowded bridge plug of annotating, includes top connection (1), setting mechanism, slips (18), packing element (21) and center tube (4), its characterized in that: the device also comprises an insertion pipe (19) and a sealing sliding sleeve assembly matched with the insertion pipe (19);
the setting mechanism comprises a blocking ring (5), a connecting sleeve (6), an auxiliary piston (7), a clamping block (8), a protective shear pin (9), a main piston (11), a lifting sleeve (12) and a cylinder barrel (3), wherein the blocking ring (5), the connecting sleeve (6) and the lifting sleeve (12) are sequentially connected through threads from top to bottom, a radial through hole for installing the clamping block (8) is processed on the connecting sleeve (6), the clamping block (8) is installed in the radial through hole, one side of the clamping block (8) abuts against the main piston (11), the other side of the clamping block (8) extends into a groove in the outer wall of the central tube (4), so that the connecting sleeve (6) is locked on the central tube (4) under the action of the clamping block (8), the main piston (11) is slidably installed on the outer cylindrical surface of the lifting sleeve (12), and the auxiliary piston (7) is slidably installed on the outer cylindrical surface of the connecting sleeve (6), the lower end of the auxiliary piston (7) is connected with the upper end of the main piston (11) through the protective shear pin (9), the inner side of the lower end of the upper joint (1) is connected to the central pipe (4) through threads, the outer side of the upper joint (1) is connected with the upper back cap (2) through threads, the cylinder barrel (3) is sleeved on the outer side of the upper joint (1), the upper side of the cylinder barrel (3) is limited and locked through the upper back cap (2) at the upper joint (1), the lower side of the cylinder barrel (3) is limited through a shoulder (29) on the outer side of the upper joint (1), and the central pipe (4) and the connecting sleeve (6) are both provided with liquid passing holes (33);
the lower end of the lifting sleeve (12) is connected with a rubber cylinder shaft (22) which is connected with the rubber cylinder shaft (22) through a setting shear pin (13), the slips (18) and the rubber cylinder (21) are both arranged on the outer side of the rubber cylinder shaft (22), the upper side and the lower side of the slips (18) are respectively provided with an upper cone (14) and a lower cone (20), the upper cone (14) and the lower cone (20) are both sleeved on the rubber cylinder shaft (22), the lower end of the upper cone (14) and the upper end of the lower cone (20) are wedged between the slips (18) and the rubber cylinder shaft (22) through conical surfaces, the inner side of the upper cone (14) is processed with an annular groove, a locking spring (15) is arranged in the annular groove, the inner side of the locking spring (15) and the outer side of the rubber cylinder shaft (22) are both provided with one-way stopping threads, the upper end of the rubber cylinder (21) is abutted against the lower end of the lower cone (20), and the lower end of, the inner side of the upper end of the lower pressure ring (24) is connected with the lower end of the rubber cylinder shaft (22) through threads;
the inserting pipe (19) is connected to the lower end of the central pipe (4) through threads;
a sealing structure is arranged between the lower end of the central tube (4) and the rubber cylinder shaft (22);
the sealing sliding sleeve assembly comprises a sliding sleeve (23), an injection sleeve (26), a sealing ring (25), a floating piston (27) and a lower back cap (28), wherein the upper end of the injection sleeve (26) is connected to the lower end of the lower pressing ring (24) through threads, the sealing ring (25) is clamped between the lower end of the rubber sleeve shaft (22) and the upper end of the injection sleeve (26), the sliding sleeve (23) is installed on the inner sides of the rubber sleeve shaft (22) and the injection sleeve (26) in a sliding mode, the floating piston (27) is installed in the injection sleeve (26) in a sliding mode, the lower back cap (28) is connected to the lower end of the injection sleeve (26) through threads, the lower side of the floating piston (27) is limited through the lower back cap (28), and liquid passing holes (33) are formed in the sliding sleeve (23) and the injection sleeve (26;
the upper end of sliding sleeve (23) is processed there is elasticity claw A (10), and the end of elasticity claw A (10) is provided with joint portion (30), and radially, the inner wall of packing element axle (22) is spacing in the outside of joint portion (30), and in the axial, the downside of joint portion (30) is spacing through processing shoulder (29) on packing element axle (22) inner wall, the outside of intubate (19) lower extreme is provided with and is used for blocking from the inboard shoulder (29) of joint portion (30).
2. An integral drillable squeeze bridge plug as defined in claim 1, wherein: the upper end of the main piston (11) is provided with an elastic claw B (31), the tail end of the elastic claw B (31) is provided with a clamping portion (30), the outer side of the clamping portion (30) is limited through the inner wall of the auxiliary piston (7) in the radial direction, the inner side of the clamping portion (30) is limited through a shoulder (29) machined on the outer wall of the connecting sleeve (6), and the lower side of the clamping portion (30) is limited through the shoulder (29) in the axial direction.
3. An integral drillable squeeze bridge plug as defined in claim 1, wherein: go up the upper end processing of cone (14) and have elasticity claw C (32), the end of elasticity claw C (32) is provided with joint portion (30), and in footpath, the outside of joint portion (30) is spacing through the inner wall of main piston (11), and the inboard of joint portion (30) is spacing through processing shoulder (29) on lifting and separating cover (12) outer wall, and in the axial, the downside of joint portion (30) is also spacing through above-mentioned shoulder (29).
Priority Applications (1)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116044343A (en) * | 2023-02-20 | 2023-05-02 | 杨帆 | Double-seal single-clamp type soluble degradable quick drilling and extrusion injection process |
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| CN116044343A (en) * | 2023-02-20 | 2023-05-02 | 杨帆 | Double-seal single-clamp type soluble degradable quick drilling and extrusion injection process |
| CN116044343B (en) * | 2023-02-20 | 2024-05-07 | 大庆市亚盛油田技术开发有限公司 | Double-seal single-clamp type soluble degradable quick drilling and extrusion injection process |
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| CN111749643B (en) | 2022-11-25 |
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