CN111608611B - Large-diameter bridge plug capable of realizing single-upper-seal fracturing and method - Google Patents
Large-diameter bridge plug capable of realizing single-upper-seal fracturing and method Download PDFInfo
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- CN111608611B CN111608611B CN202010516001.7A CN202010516001A CN111608611B CN 111608611 B CN111608611 B CN 111608611B CN 202010516001 A CN202010516001 A CN 202010516001A CN 111608611 B CN111608611 B CN 111608611B
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- 238000000034 method Methods 0.000 title abstract description 18
- 238000007789 sealing Methods 0.000 claims abstract description 110
- 238000003780 insertion Methods 0.000 claims abstract description 66
- 230000037431 insertion Effects 0.000 claims abstract description 66
- 238000004873 anchoring Methods 0.000 claims abstract description 22
- 230000006835 compression Effects 0.000 claims abstract description 9
- 238000007906 compression Methods 0.000 claims abstract description 9
- 230000005540 biological transmission Effects 0.000 claims description 18
- 239000007788 liquid Substances 0.000 claims description 17
- 230000007246 mechanism Effects 0.000 claims description 14
- 238000005086 pumping Methods 0.000 claims description 11
- 238000006073 displacement reaction Methods 0.000 claims description 10
- 238000010276 construction Methods 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 claims description 5
- 238000009792 diffusion process Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000003801 milling Methods 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 4
- 230000036961 partial effect Effects 0.000 claims description 4
- 230000000630 rising effect Effects 0.000 claims description 4
- 238000010008 shearing Methods 0.000 claims description 4
- 238000012856 packing Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 210000000664 rectum Anatomy 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 13
- 230000009466 transformation Effects 0.000 abstract description 10
- 230000002441 reversible effect Effects 0.000 abstract description 7
- 230000003628 erosive effect Effects 0.000 abstract description 5
- 238000012360 testing method Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 13
- 230000008569 process Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 4
- 230000000977 initiatory effect Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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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
- 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
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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Abstract
The invention belongs to the technical field of underground oil field oil pressure testing fracturing tools, and particularly relates to a large-drift-diameter bridge plug capable of realizing single-upper seal fracturing and a method thereof. According to the invention, through the organic combination of the hydraulic cylinder central tube, the hydraulic cylinder outer tube, the split type hands-free joint, the hands-free shear pin, the sealing ring, the central insertion tube, the bridge plug upper joint, the bridge plug central tube, the setting compression ring, the anchoring slips, the cone, the rubber cylinder, the flap valve seat, the flap valve sealing rubber cushion, the flap valve torsion spring, the flap valve plate, the flap valve base, the setting starting soluble plug, the setting starting soluble ball, the hands-free ball and the pressure-bearing plugging ball, the invention does not need to carry out long-time blowout and tubular column adjustment operation during layer-changing fracturing, and meets the long-time well-closing requirement after fracturing, and improves the reservoir transformation effect and efficiency. The invention can seal and isolate the large fracturing segment with the multi-layer perforation segments at one time, effectively avoid the reverse hydraulic jet formed by the serial leakage between the old well layers from causing erosion damage to the tool or the oil pipe, and avoid the risk of the tool encountering a card or falling into the well.
Description
Technical Field
The invention belongs to the technical field of underground oil field oil pressure testing fracturing tools, and particularly relates to a large-drift-diameter bridge plug capable of realizing single-upper seal fracturing and a method thereof.
Background
At present, the old well repeated fracturing transformation is constructed by adopting double-seal single-clamp tools. And (3) a conventional oil pipe is used for putting a double-sealing single-clamping tool into a corresponding transformation horizon, a certain perforation interval is clamped by the double-packer to be set up on the double-packer, the sealing is generated on the double-packer, and sand fracturing is realized through a sand ejector connected in the middle of the double-packer. The process tool is simple in structure, and oil pipe transmission can realize repeated volume fracturing transformation with large discharge capacity. However, when one layer of the oil pipe is required to be adjusted to drag the position of the pipe column to change the layer after the construction, the blowout operation is required before the pipe column is adjusted, the pipe column is required to be adjusted to change the layer after the wellhead pressure is released to zero, and the blowout operation time after the volume fracturing is longer, so that the overall construction efficiency is not very high. And the formation transformation effect is reduced by the open flow operation immediately after pressure relief, so that the propping agent is unfavorable for supporting the cracks, and the earlier crack closure or the reduction of the height/width of the cracks is caused, namely, the process requirement of the post-pressure well closing process cannot be met. In addition, because the number of perforation holes in the old well shaft is large, the interval sealing effect is not good, the fracturing is often easy to occur interlayer serial leakage, the old perforation holes are damaged by the reverse erosion of the tubular column, and a certain tool is at risk of construction such as blocking.
Disclosure of Invention
The invention provides a large-drift-diameter bridge plug capable of realizing single-upper seal fracturing and a method thereof, and aims to provide a bridge plug capable of realizing long-time well closing process requirements after fracturing without long-time blowout and tubular column adjustment operation during layer-changing fracturing; and secondly, the bridge plug and the method for avoiding the complex accidents of tool blocking or well falling and other risks are provided.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a large-drift-diameter bridge plug capable of realizing single-upper seal fracturing comprises a bridge plug setting mechanism, a split-type hand-off joint, a central cannula, a bridge plug, a split-type check valve and a setting start soluble plug; the bridge plug setting mechanism consists of a hydraulic cylinder central tube and a hydraulic cylinder outer cylinder; the outer side wall of the upper end of the hydraulic cylinder central tube is provided with threads, the side wall of the middle part of the hydraulic cylinder central tube is provided with a pressure transmission channel, the lower part of the hydraulic cylinder central tube is inserted into the hydraulic cylinder outer cylinder and is contacted with the inner wall of the hydraulic cylinder outer cylinder; the split type hand-off connector is arranged on the periphery of the position, adjacent to the central insertion pipe, of the hydraulic cylinder central pipe, is in threaded connection with the lower part of the hydraulic cylinder central pipe of the bridge plug setting mechanism and is fixed and sealed with the central insertion pipe through a hand-off shear pin, the lower end of the split type hand-off connector extends between the bridge plug and the central insertion pipe, and a bearing step is arranged on the outer side wall of the lower end of the split type hand-off connector; the bridge plug is sleeved on the central insertion tube, a split type hand-off connector is inserted into the upper connector of the bridge plug at the upper part of the bridge plug, and the split type hand-off connector) is connected with the hydraulic cylinder central tube of the bridge plug setting tool through threads; the flap type check valve is arranged between the lower part of the central cannula and the bridge plug and is detachably connected with the bridge plug; the setting starting soluble plug is arranged on the inner wall of the lower end of the central cannula in a sealing mode and is fixed with the inner side wall of the central cannula through a setting starting shear pin.
The outer side wall of the upper part of the hydraulic cylinder central pipe pressure transmission channel is provided with an annular bulge, the inner side wall of the hydraulic cylinder outer cylinder is provided with an annular bulge, and the annular bulge are connected in a penetrating way to form a piston chamber; annular protrusions arranged on the inner side wall of the outer cylinder and annular protrusions arranged on the outer side wall of the central tube of the hydraulic cylinder are respectively arranged on the upper side and the lower side of the pressure transmission channel; the hydraulic cylinder central tube and the hydraulic cylinder outer cylinder are contacted and sealed through two annular bulges.
An annular groove is formed in the outer side wall of the setting starting soluble plug, and a fifth sealing ring for sealing between the setting starting soluble plug and the central insertion tube is arranged in the annular groove; the outer side wall of the upper part of the central cannula is provided with an annular groove for placing a first sealing ring, and the first sealing ring is used for sealing between the split type hand-off joint and the central cannula.
The bridge plug comprises a bridge plug upper joint, a bridge plug central tube, a setting compression ring, two anchoring slips, two cones and a rubber cylinder; the lower part of the bridge plug upper joint is in threaded sealing connection with the upper part of the bridge plug central tube; the setting press ring, the anchoring slips, the cone, the rubber cylinder, the cone and the anchoring slips are sequentially sleeved on the bridge plug central tube from top to bottom, and the upper end face of the setting press ring is respectively tightly attached to the lower end face of the bridge plug upper joint and the lower end face of the hydraulic cylinder outer barrel; a third sealing ring is arranged between the central cannula and the central tube and close to the flap type check valve end.
The inner side wall of the upper joint of the bridge plug is provided with an annular groove, and a second sealing ring used for sealing between the upper joint of the bridge plug and the central tube of the bridge plug is arranged in the annular groove.
The inner diameter of the central tube of the hydraulic cylinder is larger than that of the central cannula.
The clack type check valve comprises a clack valve seat, a clack valve sealing rubber pad, a clack valve torsion spring, a clack valve plate and a clack valve base; the flap valve seat, the flap valve sealing rubber pad, the flap valve torsion spring, the flap valve plate and the flap valve base are sequentially arranged between the bridge plug central tube and the lower part of the bridge plug from top to bottom; the flap valve base is in threaded connection with the lower part of the bridge plug; the flap valve sealing rubber cushion is sleeved at the lower part of the flap valve seat; the upper end of the flap valve plate is fixed with the flap valve base through a torsion spring; the flap valve seat is arranged between the flap valve base and the bridge plug and is in tight and sealing contact with the bridge plug; the outer side wall of the valve seat of the flap valve is provided with a groove, and a fourth sealing ring used for sealing the valve seat of the flap valve and the central tube of the bridge plug is arranged in the groove.
The pressure transmission channel is formed by arranging a linear cutting slit on the central tube of the hydraulic cylinder.
The lower part of the split type hand-off connector is circumferentially provided with a plurality of linear cutting wide slits.
A construction method of a large-drift-diameter bridge plug capable of realizing single-upper-seal fracturing comprises the following steps of
Step one: connecting a large-drift-diameter bridge plug capable of realizing single-upper seal fracturing to an oil pipe through threads at the upper end of a central pipe of a hydraulic cylinder, and putting the bridge plug into a well bottom to a preset position;
step two: after the step one is finished, delivering a setting starting soluble ball from an oil pipe, wherein the setting starting soluble ball is located on the setting starting soluble plug, pumping and boosting are slowly carried out in the oil pipe, high-pressure liquid in the pipe enters a cavity between a central pipe of the hydraulic cylinder and an outer cylinder of the hydraulic cylinder through a pressure transmission channel on the central pipe of the hydraulic cylinder, the outer cylinder of the hydraulic cylinder is pushed to move downwards, and then a setting compression ring is pushed to downwards to extrude an anchoring slip, a cone and a rubber cylinder, so that the anchoring slip is propped up and meshed on the inner wall of a sleeve, the rubber cylinder is expanded and attached to the inner wall of the sleeve to form a high-pressure sealing seal, and the bridge plug is finished in a setting way after the outer cylinder of the hydraulic cylinder runs;
step three: step two, continuously boosting after finishing, continuously rising the pressure to a preset value, pushing the setting starting shear pin by the setting starting soluble plug to downwards perform displacement shearing, dropping the setting starting soluble ball and the setting starting soluble plug into the bottom of the well together, and then automatically dissolving; at the moment, the rubber cylinder forms a high-pressure sealing packing, and a central pipe of the hydraulic cylinder and a central cannula inner channel are used as liquid passing channels to carry out large-displacement single upper sealing fracturing; the large-diameter bridge plug seals and isolates the large fracturing section with a plurality of clusters of perforating sections at one time, and partial pressure is realized among clusters in the sections through temporary plugging and steering;
step four: after all fracturing transformation of each cluster in the large fracturing section is completed, delivering a release ball from the oil pipe, wherein the release ball is located at the upper port of the central insertion pipe to form a seal, pumping and boosting slowly in the oil pipe to a preset value, and the release shear pins are sheared off; simultaneously, the central insertion pipe is also carried out by the split type hand-off joint, when the central insertion pipe is pulled up, the valve plate of the flap valve can rebound to be attached to the sealing rubber pad of the flap valve under the action of the torsion spring of the flap valve, high-pressure liquid at the bottom of the well is blocked below the bridge plug, and the setting tool, the split type hand-off joint and the central insertion pipe are pulled out;
step five: step four, when the to-be-constructed layer is still on the rear bridge plug, delivering a pressure-bearing plugging ball from the oil pipe, wherein the pressure-bearing plugging ball is located in an upper joint of the bridge plug;
step six: and after all the intervals are pressed, the last pipe column setting tool is started, then the long-time well closing and diffusion are carried out, and a milling tool is put into the well until the well is put into production, so that all bridge plugs are drilled out.
The beneficial effects are that:
1. according to the invention, long-time blowout and tubular column adjustment operation are not required during layer replacement fracturing, long-time well closing process requirements can be realized after fracturing, and the reservoir transformation effect and the operation efficiency are improved;
2. the invention uses a single upper sealing pipe column structure to enter the bridge plug for sealing each time, and seals the large fracturing section with a plurality of layers of perforation sections at one time, thereby effectively avoiding the reverse hydraulic jet formed by the serial leakage between the old well layers from causing erosion damage to the tool or the oil pipe, and avoiding the complex accidents of the tool such as blocking or falling into the well.
The foregoing description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention more clearly understood, it can be implemented according to the content of the specification, and the following detailed description of the preferred embodiments of the present invention will be given with reference to the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a well logging process of the present invention;
FIG. 2 is a schematic diagram of the invention when throwing ball to hold pressure;
FIG. 3 is a schematic view of the present invention in use as a drilling tool;
FIG. 4 is a schematic diagram of the invention when the ball is thrown to hold pressure to unseat the bridge plug;
FIG. 5 is a schematic illustration of the upper set tool half of the present invention after the bridge plug is unseated;
FIG. 6 is a schematic diagram of the structure of the bridge plug left at the bottom of the well after the release of the hand and the delivery of the pressure-bearing plugging ball;
fig. 7 is a schematic drawing showing the split-type pull-out joint from the upper joint of the bridge plug in the pull-out process.
In the figure: 1-a hydraulic cylinder central tube; 2-a hydraulic cylinder outer cylinder; 3-split-type hand-off joint; 4-hand-off shear pins; 5-a first sealing ring; 6-a central cannula; 7-a bridge plug upper joint; 8-a second sealing ring; 9-a bridge plug central tube; 10-setting a compression ring; 11-anchoring slips; 12-cone; 13-a rubber cylinder; 14-a third sealing ring; 15-flap valve seat; 16-a fourth seal ring; 17-flap valve sealing rubber pads; 18-flap valve torsion spring; 19-flap valve plate; 20-flap valve base; 21-setting start shear pins; 22-setting the start-up dissolvable plug; 23-a fifth sealing ring; 24-setting the start-up soluble ball; 25-hand-free ball; 26-pressure-bearing plugging balls.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Embodiment one:
referring to fig. 1-7, a large-diameter bridge plug capable of realizing single-upper seal fracturing comprises a bridge plug setting mechanism, a split-type hand-off connector 3, a central cannula 6, a bridge plug, a split-type check valve and a setting start soluble plug 22; the bridge plug setting mechanism consists of a hydraulic cylinder central tube 1 and a hydraulic cylinder outer tube 2; the outer side wall of the upper end of the hydraulic cylinder central tube 1 is provided with threads, the side wall of the middle part of the hydraulic cylinder central tube 1 is provided with a pressure transmission channel, the lower part of the hydraulic cylinder central tube 1 is inserted into the hydraulic cylinder outer cylinder 2 and the hydraulic cylinder central tube 1 is contacted with the inner wall of the hydraulic cylinder outer cylinder 2; the split type hand-off connector 3 is arranged on the periphery of the position, adjacent to the central insertion pipe 6, of the hydraulic cylinder central pipe 1, the split type hand-off connector 3 is in threaded connection with the lower part of the hydraulic cylinder central pipe 1 of the bridge plug setting mechanism and is fixed and sealed with the central insertion pipe 6 through a hand-off shear pin 4, the lower end of the split type hand-off connector 3 extends between the bridge plug and the central insertion pipe 6, and a bearing step is arranged on the outer side wall of the lower end of the split type hand-off connector 3; the bridge plug is sleeved on the central insertion tube 6, a split type release joint 3 is inserted into an upper bridge plug joint 7 at the upper part of the bridge plug, and the split type release joint 3 is connected with a hydraulic cylinder central tube 1 of a bridge plug setting tool through threads; the valve type check valve is arranged between the lower part of the central cannula 6 and the bridge plug and is detachably connected with the bridge plug; the setting starting soluble plug 22 is arranged on the inner wall of the lower end of the central cannula 6 in a sealing way and is fixed with the inner side wall of the central cannula 6 through the setting starting shear pin 21.
When in actual use, firstly, a large-drift-diameter bridge plug capable of realizing single-upper seal fracturing is connected to an oil pipe through threads at the upper end of a hydraulic cylinder central pipe 1, and is put into a well bottom to a preset position; then delivering a setting starting soluble ball 24 from an oil pipe, wherein the setting starting soluble ball 24 is located on a setting starting soluble plug 22, pumping and boosting are slowly carried out in the oil pipe, high-pressure liquid in the oil pipe enters a cavity between a hydraulic cylinder central pipe 1 and a hydraulic cylinder outer cylinder 2 through a pressure transmission channel on the hydraulic cylinder central pipe 1, the hydraulic cylinder outer cylinder 2 is pushed to move downwards, and then a bridge plug setting mechanism is pushed to act, so that high-pressure sealing and packing are formed, and the bridge plug setting is completed after the hydraulic cylinder outer cylinder 2 runs; then continuously boosting, continuously rising the pressure to a preset value, allowing the setting starting shear pin 21 to be sheared after the setting starting soluble plug 22 is displaced downwards, allowing the setting starting soluble ball 24 and the setting starting soluble plug 22 to drop to the bottom of the well together, and then dissolving by itself; at the moment, the rubber cylinder 13 forms a high-pressure sealing partition, and the channels in the central tube 1 and the central cannula 6 of the hydraulic cylinder are used as liquid passing channels for carrying out large-displacement single-upper sealing fracturing; after all the clusters in the large fracturing section are transformed, delivering a release ball 25 from the oil pipe, wherein the release ball 25 is located at the upper port of the central insertion pipe 6 to form a seal, pumping and boosting slowly in the oil pipe to a preset value, and the release shear pin 4 is sheared off, the central insertion pipe 6 descends in the split release joint 3 until being supported by a bearing step arranged on the inner side wall at the lower end of the split release joint 3, and a pipe column is lifted up to drive the split release joint 3 to upwards and slide and be pulled out from between the bridge plug upper joint 7 and the central insertion pipe 6 so as to realize bridge plug release; simultaneously, the central insertion pipe 6 is also carried out by the split type hand-off joint 3, when the central insertion pipe 6 is pulled up, a split type check valve plugs high-pressure liquid at the bottom of the well under the bridge plug, and a setting tool, the split type hand-off joint 3 and the central insertion pipe 6 are pulled out; after the completion, if a layer to be constructed is still arranged on the bridge plug, delivering the pressure-bearing plugging ball 26 from the oil pipe, wherein the pressure-bearing plugging ball 26 is located in the upper joint 7 of the bridge plug; and after all the intervals are pressed, the last pipe column setting tool is started, then the long-time well closing and diffusion are carried out, and a milling tool is put into the well until the well is put into production, so that all bridge plugs are drilled out.
After the split type hand-off connector 3 is inserted into the bridge plug connector 7, the central insertion pipe 6 is inserted into the bridge plug central pipe 7 from the split type hand-off connector 3, so that the split type hand-off connector 3 and the bridge plug upper connector 7 are limited and fixed. The central cannula 6 and the split-type hand-off connector 3 are fixed in a limiting way through the hand-off shear pin 4.
The inner diameter of the central cannula 6 in the invention can reach 50mm, thereby meeting the requirement of large-displacement liquid passing.
By using the method for fracturing the reservoir, long-time open flow and tubular column adjustment operation are not needed when the reservoir is replaced and fractured, long-time well closing process requirements can be met after fracturing, and the reservoir transformation effect and the operation efficiency are improved; the invention uses a single upper sealing pipe column structure to enter the bridge plug for sealing each time, and seals the large fracturing section with a plurality of layers of perforation sections at one time, thereby effectively avoiding the erosion damage to the tool/oil pipe caused by reverse hydraulic jet formed by the serial leakage between old well layers and avoiding the complex accidents such as the tool getting stuck/falling into the well and the like.
Embodiment two:
referring to fig. 1 to 5, a large-diameter bridge plug capable of realizing single-seal fracturing is different from the first embodiment in that: the outer side wall of the upper part of the pressure transmission channel of the hydraulic cylinder central tube 1 is provided with an annular bulge, the inner side wall of the hydraulic cylinder outer tube 2 is provided with an annular bulge, and the annular bulge are connected in a penetrating way to form a piston chamber; annular protrusions arranged on the inner side wall of the outer cylinder 2 and annular protrusions arranged on the outer side wall of the central cylinder 1 are respectively arranged on the upper side and the lower side of the pressure transmission channel; the hydraulic cylinder central tube 1 and the hydraulic cylinder outer tube 2 are contacted and sealed through two annular bulges.
When the hydraulic bridge plug sealing device is in actual use, by adopting the technical scheme, when the pressure is slowly pumped and increased in the oil pipe, high-pressure liquid in the oil pipe conveniently enters a cavity between the hydraulic cylinder central pipe 1 and the hydraulic cylinder outer cylinder 2 through a pressure-uploading channel of the hydraulic cylinder central pipe 1, the hydraulic cylinder outer cylinder 2 is pushed to move downwards, and then the bridge plug sealing mechanism is pushed to act, so that high-pressure sealing and sealing are formed, and the bridge plug sealing is completed after the hydraulic cylinder outer cylinder 2 runs.
Embodiment III:
referring to fig. 1 to 4, a large-diameter bridge plug capable of realizing single-seal fracturing is different from the first embodiment in that: an annular groove is formed in the outer side wall of the setting starting soluble plug 22, and a fifth sealing ring 23 used for sealing between the setting starting soluble plug 22 and the central insertion tube 6 is arranged in the annular groove; the outer side wall of the upper part of the central cannula 6 is provided with an annular groove for placing a first sealing ring 5, and the first sealing ring 5 is used for sealing between the split type hand-off joint 3 and the central cannula 6.
When in actual use, the sealing ring is adopted for sealing, and particularly the sealing ring is arranged in the groove, so that the relative stability of the position of the sealing ring is ensured, and the high-pressure sealing has better effect.
Embodiment four:
referring to fig. 1 to 4 and 6, a large-diameter bridge plug capable of realizing single-seal fracturing is different from the first embodiment in that: the bridge plug comprises a bridge plug connector 7, a bridge plug central tube 9, a setting pressure ring 10, two anchoring slips 11, two cones 12 and a rubber cylinder 13; the lower part of the bridge plug upper joint 7 is in threaded sealing connection with the upper part of the bridge plug central tube 9; the setting press ring 10, the anchoring slips 11, the cone 12, the rubber cylinder 13, the cone 12 and the anchoring slips 11 are sequentially sleeved on the bridge plug central tube 9 from top to bottom, and the upper end surface of the setting press ring 10 is respectively tightly attached to the lower end surface of the bridge plug upper joint 7 and the lower end surface of the hydraulic cylinder outer tube 2; a third sealing ring 14 is arranged between the central cannula 6 and the central tube 9 and is close to the flap-type check valve end.
Further, an annular groove is formed in the inner side wall of the bridge plug upper connector 7, and a second sealing ring 8 used for sealing between the bridge plug upper connector 7 and a bridge plug central tube 9 is arranged in the annular groove.
In actual use, when the setting tool and the invention are connected into a whole and then transmitted to the bottom of the well by using an oil pipe, after the setting tool and the invention are lowered to a preset position, a setting starting soluble ball 24 is delivered from the inside of the pipe column and is located at the upper end of a setting starting soluble plug 22, the inside of the pipe is pressurized, the hydraulic cylinder outer cylinder 2 of the setting tool is started to descend at first, the setting compression ring 10 is pushed to extrude an anchoring slip 11, a cone 12 and a rubber cylinder 13, and the bridge plug is promoted to be set. After the bridge plug is set, the pressure is increased to a preset value to shear the setting initiation shear pin 21, the setting initiation soluble plug 22 and the setting initiation soluble ball 24 drop to the bottom of the well, and then self-dissolve.
The inner side wall of the bridge plug connector 7 is provided with an annular groove, and the annular groove is used for sealing between the bridge plug connector 7 and the bridge plug central tube 9, so that the position of the sealing ring is relatively stable, and the sealing ring has a good high-pressure sealing effect.
Fifth embodiment:
referring to fig. 1 to 5, a large-diameter bridge plug capable of realizing single-seal fracturing is different from the first embodiment in that: the inner diameter of the central tube 1 of the hydraulic cylinder is larger than that of the central cannula 6.
When in actual use, the inner diameter of the central tube 1 of the hydraulic cylinder is larger than that of the central cannula 6, so that the hand-free ball 25 can be conveniently accepted. When pumping and pressurizing are carried out from the wellhead to the inside of the tubular column, the pressure rises to a certain value, the hand-off shear pin 4 is sheared, and the hand-off ball 25 pushes the central cannula 6 to move downwards.
Example six:
referring to fig. 1 to 4 and 6, a large-diameter bridge plug capable of realizing single-seal fracturing is different from the first embodiment in that: the clack type check valve comprises a clack valve seat 15, a clack valve sealing rubber pad 17, a clack valve torsion spring 18, a clack valve plate 19 and a clack valve base 20; the flap valve seat 15, the flap valve sealing rubber pad 17, the flap valve torsion spring 18, the flap valve plate 19 and the flap valve base 20 are sequentially arranged between the bridge plug central tube and the lower part of the bridge plug from top to bottom; the flap valve base 20 is in threaded connection with the lower part of the bridge plug; the flap valve sealing rubber cushion 17 is sleeved at the lower part of the flap valve seat 15; the upper end of the flap valve plate 19 is fixed with a flap valve base 20 through a torsion spring 18; the flap valve seat 15 is arranged between the flap valve base 20 and the bridge plug and is in tight and sealing contact with the bridge plug; the outer side wall of the flap valve seat 15 is provided with a groove, and a fourth sealing ring 16 for sealing the flap valve seat 15 and the bridge plug central tube 9 is arranged in the groove.
When in actual use, the flap valve sealing rubber cushion 17 is sleeved on the outer edge of the lower end surface step of the flap valve seat 15, the flap valve plate 19 is fixedly arranged on the upper part of the flap valve base 20 through the flap valve torsion spring 18, the flap valve base 20 is propped against the lower end surface step of the flap valve seat 15, and the flap valve sealing rubber cushion 17 is sleeved in the inner hole to form sealing. The flap valve plate 19 can rotate on the flap valve base 20 around the central axis of the flap valve torsion spring 18, and when the flap valve plate 19 rotates to be attached to the flap valve sealing rubber pad 17, reverse high-pressure sealing can be formed. The flap valve seat 15 and the flap valve sealing rubber pad 17 press and cling to the end face of the inner hole of the lower part of the bridge plug central tube 9, so that the close fit of the flap valve plate 19 is ensured, and the high-pressure sealing effect is facilitated.
The prior art is adopted for the flap valve seat 15 and the flap valve base 20 in this embodiment.
Embodiment seven:
referring to fig. 1 to 5, a large-diameter bridge plug capable of realizing single-seal fracturing is different from the first embodiment in that: the pressure transmission channel is formed by arranging a linear cutting slit on the hydraulic cylinder central tube 1.
In specific application, the method can also be replaced by a method of installing a steel wire filter screen and the like.
Example eight:
referring to fig. 1 to 5 and 7, a large-diameter bridge plug capable of realizing single-seal fracturing is different from the first embodiment in that: the lower circumference of the split type hand-off connector 3 is provided with a plurality of linear cutting wide slits.
When in actual use, the lower part of the split type hand-off connector 3 is circumferentially provided with a plurality of linear cutting wide slits, so that the large-diameter head at the lower end of the split type hand-off connector can be contracted, namely the outer diameter of the split type hand-off connector is reduced, and the lower part of the split type hand-off connector 3 can be inserted into the bridge plug connector 7 and sprung out to be in a free state. Then the central insertion tube 6 can be inserted into the bridge plug central tube 9 from above the split type hand-off joint 3, the flap valve plate 19 is poked rightwards, the central insertion tube 6 is downwards inserted into the split type hand-off joint 3 and the bridge plug central tube 9 for a certain distance, so that the hand-off shear pin 4 can be screwed in from the split type hand-off joint 3 body and inserted into the corresponding small hole on the central insertion tube 6, and the split type hand-off joint 3, the central insertion tube 6 and the bridge plug upper joint 7 are fixedly connected.
Example nine:
a construction method of a large-drift-diameter bridge plug capable of realizing single-upper-seal fracturing comprises the following steps of
Step one: connecting a large-drift-diameter bridge plug capable of realizing single-upper seal fracturing to an oil pipe through threads at the upper end of a central pipe 1 of a hydraulic cylinder, and putting the bridge plug into a well bottom to a preset position;
step two: after the step one is finished, delivering a setting starting soluble ball 24 from an oil pipe, wherein the setting starting soluble ball 24 is located on a setting starting soluble plug 22, pumping and boosting are slowly carried out in the oil pipe, high-pressure liquid in the oil pipe enters a cavity between a hydraulic cylinder central pipe 1 and a hydraulic cylinder outer cylinder 2 through a pressure transmission channel on the hydraulic cylinder central pipe 1, the hydraulic cylinder outer cylinder 2 is pushed to move downwards, and then a setting compression ring 10 is pushed to downwards to press an anchoring slip 11, a cone 12 and a rubber cylinder 13, so that the anchoring slip 11 is propped up and meshed on the inner wall of a sleeve, the rubber cylinder 13 is expanded and attached to the inner wall of the sleeve to form a high-pressure sealing seal, and the bridge plug is finished after the hydraulic cylinder outer cylinder 2 runs;
step three: step two, continuing to boost after finishing, continuously rising the pressure to a preset value, pushing the setting starting shear pin 21 by the setting starting soluble plug 22 to downwards perform displacement shearing, and dropping the setting starting soluble ball 24 and the setting starting soluble plug 22 together into the bottom of the well, and then dissolving by self; at the moment, the rubber cylinder 13 forms a high-pressure sealing partition, and the channels in the central tube 1 and the central cannula 6 of the hydraulic cylinder are used as liquid passing channels for carrying out large-displacement single-upper sealing fracturing; the large-diameter bridge plug seals and isolates the large fracturing section with a plurality of clusters of perforating sections at one time, and partial pressure is realized among clusters in the sections through temporary plugging and steering;
step four: after all the clusters in the large fracturing section are transformed, delivering a release ball 25 from the oil pipe, wherein the release ball 25 is located at the upper port of the central insertion pipe 6 to form a seal, pumping and boosting slowly in the oil pipe to a preset value, cutting off release shear pins 4, descending the central insertion pipe 6 in the split release joint 3 until the central insertion pipe is blocked by a bearing step arranged on the inner side wall at the lower end of the split release joint 3, lifting a pipe column, driving the split release joint 3 to ascend and slipping and being pulled out from between the bridge plug upper joint 7 and the central insertion pipe 6, and realizing bridge plug release; simultaneously, the central insertion pipe 6 is also carried out by the split type hand-off joint 3, when the central insertion pipe 6 is pulled up, the flap valve plate 19 can rebound to be attached to the flap valve sealing rubber pad 17 under the action of the flap valve torsion spring 18, high-pressure liquid at the bottom of the well is blocked under the bridge plug, and a setting tool, the split type hand-off joint 3 and the central insertion pipe 6 are pulled out;
step five: when the to-be-constructed layer is still on the rear bridge plug, delivering a pressure-bearing plugging ball 26 from the oil pipe, wherein the pressure-bearing plugging ball 26 is located in the upper joint 7 of the bridge plug;
step six: and after all the intervals are pressed, the last pipe column setting tool is started, then the long-time well closing and diffusion are carried out, and a milling tool is put into the well until the well is put into production, so that all bridge plugs are drilled out.
When in actual use, the large-drift-diameter bridge plug capable of realizing single upper seal fracturing is connected to an oil pipe through threads at the upper end of the hydraulic cylinder central pipe 1 and is put into the bottom of the well together, so that the setting position of the large-drift-diameter bridge plug can seal and isolate a large fracturing section with a plurality of perforation intervals.
After the tool is put in place, a setting starting soluble ball 24 is delivered from the oil pipe, the setting starting soluble ball 24 is located on the setting starting soluble plug 22, pumping is slowly carried out in the oil pipe to raise pressure, high-pressure liquid in the pipe enters a cavity between the hydraulic cylinder central pipe 1 and the hydraulic cylinder outer cylinder 2 through a pressure transmission channel on the hydraulic cylinder central pipe 1, the hydraulic cylinder outer cylinder 2 is pushed to move downwards, the setting compression ring 10 is pushed to downwards to press the anchoring slips 11, the cone 12 and the rubber cylinder 13, the anchoring slips 11 are unfolded and meshed on the inner wall of the sleeve, the rubber cylinder 13 is inflated and attached to the inner wall of the sleeve to form high-pressure sealing and isolating, and the bridge plug setting is completed after the hydraulic cylinder outer cylinder 2 runs. Continuing to boost, the pressure continuously rises to a certain value, the setting starting shear pin 21 is sheared by displacement caused by downward movement of the setting starting soluble plug 22, and the setting starting soluble ball 24 and the setting starting soluble plug 22 drop down to the bottom of the well together and then dissolve by self. At the moment, the rubber cylinder 13 of the bridge plug forms a high-pressure sealing and isolating device, and the channels in the central tube 1 and the central cannula 6 of the hydraulic cylinder can be used as liquid passing channels to carry out large-displacement single-upper sealing and fracturing. The large-diameter bridge plug seals and separates the large fracturing section with multi-cluster perforation sections at one time, and partial pressure is realized among clusters in the sections through temporary plugging and steering. And realizing layered fracturing among clusters in the large fracturing segment through temporary blocking steering. After all fracturing transformation of each cluster in the large fracturing section is completed, delivering a release ball 25 from the oil pipe, enabling the release ball 25 to be located at the upper port of the central insertion pipe to form sealing, slowly pumping and boosting the oil pipe to a certain value (the generated piston force is higher than the pressure value when the setting starting shear pin 21 is sheared), shearing the release shear pin 4, enabling the central insertion pipe 6 to descend in the split release joint 3 until being blocked by a step, enabling the central insertion pipe 6 to lose the limit constraint of an inner hole of a large-diameter head at the lower part of the split release joint 3, lifting a pipe column, driving the split release joint 3 to slide upwards from an inner ring groove of the bridge plug upper joint 7 and be pulled out, and realizing bridge plug release. Simultaneously, the central insertion tube 6 is also carried out by the split type hand-off connector 3, when the central insertion tube 6 is pulled up, the flap valve plate 19 can rebound to be attached to the flap valve sealing rubber pad 17 under the action of the flap valve torsion spring 18, so that a reverse high-pressure sealing effect is formed, and high-pressure liquid at the bottom of the well is blocked below the bridge plug. The setting tool and the split type release joint 3 and the central cannula 6 can be safely and smoothly pulled out without blowout.
When a horizon is still to be constructed on the bridge plug, the pressure-bearing plugging balls 26 are delivered from the oil pipe. The pressure-bearing plugging ball 26 is located in the bridge plug upper joint 7 to form a forward high-pressure plugging, and then the single upper sealing fracturing of the large-diameter bridge plug can be implemented on the bridge plug which is out of hand. The two bridge plugs form a double-sealing single-clamping effect.
After all the intervals are pressed, the last pipe column setting tool is started, so that long-time well closing and diffusion can be carried out, an ideal reservoir reconstruction effect is ensured, and all bridge plugs are drilled out by a special milling tool before production is started.
In summary, the invention starts the soluble plug through the bridge plug setting mechanism, the split-type hands-off joint, the central cannula, the bridge plug, the split-type check valve and the setting; the bridge plug setting mechanism consists of a hydraulic cylinder central tube and a hydraulic cylinder outer cylinder; the outer side wall of the upper end of the central tube of the hydraulic cylinder is provided with threads, the side wall of the middle part of the central tube of the hydraulic cylinder is provided with a pressure transmission channel, the lower part of the central tube of the hydraulic cylinder is inserted into the outer cylinder of the hydraulic cylinder and tightly attached to the upper end of the central insertion tube, and the central tube of the hydraulic cylinder is contacted with the inner wall of the outer cylinder of the hydraulic cylinder; the split type hand-off connector is arranged on the periphery of the position, close to the central insertion pipe, of the hydraulic cylinder central pipe, the split type hand-off connector is detachably connected with the lower part of the hydraulic cylinder central pipe of the bridge plug setting mechanism and is fixed and sealed with the central insertion pipe through a hand-off shear pin, the lower end of the split type hand-off connector extends between the bridge plug and the central insertion pipe, and the inner side wall of the lower end of the split type hand-off connector is provided with a bearing step; the bridge plug is sleeved on the central insertion tube, and the upper part of the bridge plug is arranged between the outer cylinder of the hydraulic cylinder and the central insertion tube; the flap type check valve is arranged between the lower part of the central cannula and the bridge plug and is detachably connected with the bridge plug; the setting starting soluble plug is arranged inside the lower end of the inner portion of the central insertion pipe in a sealing mode, the setting starting shear pins are fixed to the inner side wall of the central insertion pipe, long-time blowout and pipe column adjustment operation are not needed during layer-changing fracturing, long-time well closing process requirements can be met after fracturing, and reservoir transformation effect and operation efficiency are improved. The invention uses a single upper sealing pipe column structure to enter the bridge plug for sealing each time, and seals the large fracturing section with a plurality of layers of perforation sections at one time, thereby effectively avoiding the erosion damage to the tool/oil pipe caused by reverse hydraulic jet formed by the serial leakage between old well layers and avoiding the complex accidents such as the tool getting stuck/falling into the well and the like.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Under the condition of no conflict, the technical features related to the examples can be combined with each other according to actual situations by a person skilled in the art so as to achieve corresponding technical effects, and specific details of the combination situations are not described in detail herein.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
While the invention is susceptible of embodiments in accordance with the preferred embodiments, the invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. Any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (8)
1. The utility model provides a big latus rectum bridging plug that can realize single upper seal fracturing which characterized in that: comprises a bridge plug setting mechanism, a split type hand-off joint (3), a central cannula (6), a bridge plug, a split type check valve and a setting start soluble plug (22); the bridge plug setting mechanism consists of a hydraulic cylinder central tube (1) and a hydraulic cylinder outer cylinder (2); the outer side wall of the upper end of the hydraulic cylinder central tube (1) is provided with threads, the side wall of the middle part of the hydraulic cylinder central tube (1) is provided with a pressure transmission channel, the lower part of the hydraulic cylinder central tube (1) is inserted into the hydraulic cylinder outer cylinder (2), and the hydraulic cylinder central tube (1) is in contact with the inner wall of the hydraulic cylinder outer cylinder (2); the split type hand-off connector (3) is arranged on the periphery of the position, adjacent to the central insertion pipe (6), of the hydraulic cylinder central pipe (1), the split type hand-off connector (3) is in threaded connection with the lower part of the hydraulic cylinder central pipe (1) of the bridge plug setting mechanism and is fixed and sealed with the central insertion pipe (6) through a hand-off shear pin (4), the lower end of the split type hand-off connector (3) extends to the position between the bridge plug and the central insertion pipe (6), and a bearing step is arranged on the outer side wall of the lower end of the split type hand-off connector (3); the bridge plug is sleeved on the central insertion pipe (6), a split type hand-off connector (3) is inserted into a bridge plug upper connector (7) at the upper part of the bridge plug, and the split type hand-off connector (3) is connected with a hydraulic cylinder central pipe (1) of a bridge plug setting tool through threads; the flap type check valve is arranged between the lower part of the central insertion tube (6) and the central tube of the bridge plug and is detachably connected with the bridge plug; the setting starting soluble plug (22) is arranged on the inner wall of the lower end of the central insertion tube (6) in a sealing way and is fixed with the inner wall of the central insertion tube (6) through a setting starting shear pin (21);
the bridge plug comprises a bridge plug upper joint (7), a bridge plug central tube (9), a setting compression ring (10), two anchoring slips (11), two cones (12) and a rubber cylinder (13); the lower part of the bridge plug upper joint (7) is in threaded sealing connection with the upper part of the bridge plug central tube (9); the setting press ring (10), the first anchoring slip, the first cone, the rubber cylinder (13), the second cone and the second anchoring slip are sequentially sleeved on the bridge plug central tube (9) from top to bottom, and the upper end surface of the setting press ring (10) is tightly attached to the lower end surface of the bridge plug upper joint (7) and the lower end surface of the hydraulic cylinder outer tube (2) respectively; a third sealing ring (14) is arranged between the central insertion pipe (6) and the bridge plug central pipe (9) and close to the flap-type uniflow valve end;
the lower part circumference of the split type hand-off joint (3) is provided with a plurality of linear cutting wide slits.
2. The large-diameter bridge plug capable of realizing single-seal fracturing according to claim 1, wherein the bridge plug is characterized in that: the outer side wall of the upper part of the pressure transmission channel of the hydraulic cylinder central tube (1) is provided with an annular bulge, the inner side wall of the hydraulic cylinder outer cylinder (2) is provided with an annular bulge, and the annular bulge are connected in a penetrating way to form a piston chamber; annular protrusions arranged on the inner side wall of the outer cylinder (2) and annular protrusions arranged on the outer side wall of the central tube (1) of the hydraulic cylinder are respectively arranged on the upper side and the lower side of the pressure transmission channel; the hydraulic cylinder central tube (1) and the hydraulic cylinder outer tube (2) are contacted and sealed through two annular bulges.
3. The large-diameter bridge plug capable of realizing single-seal fracturing according to claim 1, wherein the bridge plug is characterized in that: an annular groove is formed in the outer side wall of the setting starting soluble plug (22), and a fifth sealing ring (23) for sealing between the setting starting soluble plug (22) and the central insertion tube (6) is arranged in the annular groove; an annular groove for placing a first sealing ring (5) is formed in the outer side wall of the upper portion of the central insertion tube (6), and the first sealing ring (5) is used for sealing between the split type hand-off joint (3) and the central insertion tube (6).
4. The large-diameter bridge plug capable of realizing single-seal fracturing according to claim 1, wherein the bridge plug is characterized in that: the inner side wall of the bridge plug upper joint (7) is provided with an annular groove, and a second sealing ring (8) used for sealing between the bridge plug upper joint (7) and the bridge plug central tube (9) is arranged in the annular groove.
5. The large-diameter bridge plug capable of realizing single-seal fracturing according to claim 1, wherein the bridge plug is characterized in that: the inner diameter of the central tube (1) of the hydraulic cylinder is larger than that of the central insertion tube (6).
6. The large-diameter bridge plug capable of realizing single-seal fracturing according to claim 1, wherein the bridge plug is characterized in that: the clack type check valve comprises a clack valve seat (15), a clack valve sealing rubber pad (17), a clack valve torsion spring (18), a clack valve plate (19) and a clack valve base (20); the flap valve seat (15), the flap valve sealing rubber pad (17), the flap valve torsion spring (18), the flap valve plate (19) and the flap valve base (20) are sequentially arranged between the bridge plug central tube and the lower part of the bridge plug from top to bottom; the flap valve base (20) is in threaded connection with the lower part of the bridge plug; the flap valve sealing rubber pad (17) is sleeved at the lower part of the flap valve seat (15); the upper end of the flap valve plate (19) is fixed with the flap valve base (20) through a flap valve torsion spring (18); the flap valve seat (15) is arranged between the flap valve base (20) and the bridge plug and is in sealing contact with the bridge plug; the outer side wall of the flap valve seat (15) is provided with a groove, and a fourth sealing ring (16) used for sealing the flap valve seat (15) and the bridge plug central tube (9) is arranged in the groove.
7. The large-diameter bridge plug capable of realizing single-seal fracturing according to claim 1, wherein the bridge plug is characterized in that: the pressure transmission channel is formed by arranging a linear cutting slit on the hydraulic cylinder central tube (1).
8. A construction method of a large-diameter bridge plug for realizing single-seal fracturing according to any one of claims 1 to 7, comprising the following steps of
Step one: connecting a large-drift-diameter bridge plug capable of realizing single-upper seal fracturing to an oil pipe through threads at the upper end of a central pipe (1) of a hydraulic cylinder, and putting the bridge plug into a well bottom to a preset position;
step two: after the step one is finished, delivering a setting starting soluble ball (24) from an oil pipe, wherein the setting starting soluble ball (24) is located on a setting starting soluble plug (22), pumping and boosting are slowly carried out in the oil pipe, high-pressure liquid in the pipe enters a cavity between a hydraulic cylinder central pipe (1) and a hydraulic cylinder outer cylinder (2) through an uploading pressure channel of the hydraulic cylinder central pipe (1), the hydraulic cylinder outer cylinder (2) is pushed to move downwards, a setting compression ring (10) is pushed to downwards to extrude a first anchoring slip, a first cone, a rubber cylinder (13), a second cone and a second anchoring slip, the first anchoring slip and the second anchoring slip are enabled to be spread and meshed on the inner wall of a sleeve, the rubber cylinder (13) is expanded and attached to the inner wall of the sleeve to form high-pressure sealing and blocking, and the bridge plug is finished after the hydraulic cylinder outer cylinder (2) runs;
step three: step two, continuously boosting after finishing, continuously rising the pressure to a preset value, pushing the setting starting shear pin (21) by the setting starting soluble plug (22) to downwards perform displacement shearing, and enabling the setting starting soluble ball (24) and the setting starting soluble plug (22) to drop to the bottom of a well together, and then automatically dissolving; at the moment, the rubber cylinder (13) forms high-pressure sealing and packing, and the inner channels of the central tube (1) and the central insertion tube (6) of the hydraulic cylinder are used as liquid passing channels to carry out large-displacement single upper sealing and fracturing; the large-diameter bridge plug seals and isolates the large fracturing section with a plurality of clusters of perforating sections at one time, and partial pressure is realized among clusters in the sections through temporary plugging and steering;
step four: after all the clusters in the large fracturing section are transformed, delivering a release ball (25) from the inside of the oil pipe, sealing the upper port of a central insertion pipe (6) by the release ball (25), pumping and boosting slowly in the oil pipe to a preset value, cutting off release shear pins (4), descending the central insertion pipe (6) in a split release joint (3) until the central insertion pipe is blocked by a bearing step arranged on the inner side wall at the lower end of the split release joint (3), lifting a pipe column, driving the split release joint (3) to ascend and to slip from between an upper bridge plug joint (7) and the central insertion pipe (6) and pulling out the split release joint to realize bridge plug release; simultaneously, the central insertion pipe (6) is also carried out by the split type hand-off joint (3), when the central insertion pipe (6) is pulled out upwards, the flap valve plate (19) can rebound to be attached to the flap valve sealing rubber pad (17) under the action of the flap valve torsion spring (18), high-pressure liquid at the bottom of the well is blocked below the bridge plug, and the setting tool, the split type hand-off joint (3) and the central insertion pipe (6) are pulled out;
step five: when the to-be-constructed layer is still on the rear bridge plug, delivering a pressure-bearing plugging ball (26) from the oil pipe, wherein the pressure-bearing plugging ball (26) is located in the upper joint (7) of the bridge plug;
step six: and after the fracturing of all the intervals is finished, a last pipe column setting tool is started, then long-time well closing and diffusion are carried out, and a milling tool is put into before production is started to drill out all bridge plugs.
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| CN114837606B (en) * | 2022-05-27 | 2024-05-03 | 中国石油化工股份有限公司 | Plugging combination tool for shaft section segmented fracturing |
| CN114737941B (en) * | 2022-05-27 | 2024-05-17 | 中国石油化工股份有限公司 | Staged fracturing construction method for long well section |
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| CN111608611A (en) | 2020-09-01 |
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