CN116163684A - Shale gas sleeve variable well staged fracturing soluble bridge plug with outer diameter of 75mm and 114.3mm after expansion - Google Patents
Shale gas sleeve variable well staged fracturing soluble bridge plug with outer diameter of 75mm and 114.3mm after expansion Download PDFInfo
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- CN116163684A CN116163684A CN202310401382.8A CN202310401382A CN116163684A CN 116163684 A CN116163684 A CN 116163684A CN 202310401382 A CN202310401382 A CN 202310401382A CN 116163684 A CN116163684 A CN 116163684A
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- push block
- cone push
- bridge plug
- sealing
- ring
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- 238000007789 sealing Methods 0.000 claims abstract description 83
- 238000004873 anchoring Methods 0.000 claims abstract description 44
- 229920001971 elastomer Polymers 0.000 claims abstract description 33
- 239000005060 rubber Substances 0.000 claims abstract description 33
- 230000007246 mechanism Effects 0.000 claims abstract description 24
- 238000005086 pumping Methods 0.000 claims abstract description 16
- 238000001125 extrusion Methods 0.000 claims abstract description 11
- 230000009471 action Effects 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims abstract description 6
- 230000008569 process Effects 0.000 claims abstract description 6
- 239000000956 alloy Substances 0.000 claims description 16
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 claims description 14
- 239000003292 glue Substances 0.000 claims description 8
- 239000000565 sealant Substances 0.000 claims description 8
- 229920000459 Nitrile rubber Polymers 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 229910010293 ceramic material Inorganic materials 0.000 claims description 5
- 239000003129 oil well Substances 0.000 claims description 3
- 238000012856 packing Methods 0.000 abstract description 6
- 238000010276 construction Methods 0.000 description 5
- 238000004090 dissolution Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000003721 gunpowder Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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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
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
- E21B23/01—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for anchoring the tools or the like
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- 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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- 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)
- Dowels (AREA)
Abstract
The invention discloses a soluble bridge plug with the outer diameter of 114.3mm after 75mm expansion for shale gas sleeve variable well staged fracturing, which comprises a releasing joint, a sealing mechanism, an anchoring slip, a tailstock, a primary cone push block, a secondary cone push block, a pumping ring and a center rod combination. In the setting process, the primary cone push block, the sealing mechanism and the secondary cone push block move downwards in a limiting manner along the central rod group, and the secondary cone push block moves downwards in a limiting manner to drive the anchoring slips to split and expand outwards in the radial direction so as to quickly engage the casing wall to finish setting. After the setting and anchoring, the primary cone push block continues to move downwards in a limiting manner, and the sealing rubber ring is outwards expanded under the extrusion action of the primary cone push block until the sealing rubber ring is completely expanded to be closely attached to the inner wall of the sleeve to finish sealing. The bridge plug can stably pass through the sleeve when the sleeve is severely reduced in diameter and deformed, and the bridge plug is sealed and the anchoring of slips is safer and more reliable. After the setting is finished, the contact sealing is realized without throwing a plugging ball to seat, and the sealing and packing functions can be realized rapidly.
Description
Technical Field
The invention relates to the technical field of downhole tools for shale gas sleeve variable well fracturing operation, in particular to a soluble bridge plug with an outer diameter of 114.3mm after expansion of 75mm for shale gas sleeve variable well staged fracturing.
Background
With continuous exploration of unconventional oil and gas resources, shale gas is taken as a typical unconventional oil and gas resource, so that exploitation difficulty is high, and exploitation efficiency is extremely low. The staged fracturing technology of the horizontal well has become an important technical means for effectively improving the oil reservoir yield, and the bridge plug is one of key tools for fracturing operation. The conventional drillable bridge plug needs drilling and grinding after construction, thus easily causing underground accidents and having high construction cost; the soluble bridge plug can be automatically dissolved without drilling and grinding, has strong bearing capacity, wide application range and high operation efficiency, and can rapidly put into production through the whole diameter of the shaft after dissolution.
The problem of serious deformation of the shale gas well casing is common in the existing shale gas well exploitation process. The outer diameter of the existing soluble bridge plugs is above 95mm, and the existing soluble bridge plugs cannot be pumped to a preset design position when the casing is severely reduced in diameter and deformed during or after horizontal well fracturing. And the bridge plug is large in volume, long in dissolution time, difficult in degradation of the sealing rubber cylinder, difficult in flowback, and incapable of effectively realizing sealing and packing, greatly influences the construction efficiency, and seriously hinders the quick production of a gas well.
Disclosure of Invention
The invention aims to design a soluble bridge plug with the outer diameter of 114.3mm after 75mm expansion of a shale gas sleeve variable well staged fracturing, so that the soluble bridge plug can stably pass when the shale gas well sleeve is severely deformed in fracturing operation, and can finish better sealing when a sealing mechanism is greatly deformed and expanded, the whole bridge plug is sufficiently loaded and reliably anchored, and the whole bridge plug is completely dissolved after the fracturing is finished, so that the full-drift-diameter rapid production of a shaft is realized.
The technical scheme of the invention is as follows: the external diameter of the shale gas sleeve variable well staged fracturing is 114.3mm after expansion, and the shale gas sleeve variable well staged fracturing comprises a releasing connector, a sealing mechanism, an anchoring slip and a tailstock, and further comprises a primary cone push block, a secondary cone push block, a pumping ring and a center rod combination. The pumping ring is fixed on the tailstock, the tailstock is in threaded fit connection and fixation with the lower center rod, and the integral slip set is matched with the tailstock and sleeved on the center rod combination. The sealing rubber ring is arranged at the middle position of the anti-outburst protection ring and the primary cone push block, is matched with the anti-outburst protection ring, and the secondary cone push block and the anti-outburst protection ring are connected into a whole in a threaded matched manner, so that the sealing rubber ring can move in a limiting manner on the upper end center rod. The first-stage cone push block is matched with the releasing connector, a limiting self-locking device is arranged in the first-stage cone push block, the first-stage cone push block is fixedly connected with the releasing connector through an anti-front setting pin, an upper-end center rod is matched with the first-stage cone push block, and the first-stage cone push block can move in a limiting mode on the upper-end center rod. The releasing connector is fixedly connected with the upper end center rod in a threaded fit manner, and is fixedly connected with the setting tool release rod in a threaded fit manner. In the setting process, as the pins in the anti-advance setting pin holes are sheared, the primary cone push block, the sealing mechanism and the secondary cone push block of the bridge plug move downwards in a limiting manner along the central rod, and the secondary cone push block moves downwards in a limiting manner to drive the anchoring slips to split and expand outwards in the radial direction so as to be quickly meshed into the casing wall to finish setting. After setting and anchoring, the first-stage cone push block continues to move downwards in a limiting manner, and the sealing rubber ring is outwards expanded under the extrusion action of the first-stage cone push block to generate large deformation expansion, so that the sealing rubber ring is completely expanded and expanded to be closely attached to the inner wall of the sleeve. After the sealing is completed, the first-stage cone push block can be fixed inside the sealing glue ring. In the structure, the bridge plug uses the two-stage cone push block to complete sealing and packing and anchoring of slips, so that the bridge plug is safer and more reliable. The sealant ring is expanded by the large deformation of the external diameter of 75mm under the extrusion action of the first-stage cone push block to be tightly attached to the inner wall of the sleeve, so that the sealing is completed; the secondary cone push block drives the integral slip group to expand outwards in the radial direction to move out, and the integral slip group is quickly meshed into the casing wall to finish setting. After the setting is finished, the bridge plug can realize contact sealing without throwing a blocking ball to seat, and can directly and quickly realize sealing and packing functions.
The tail seat is integrally conical, the top of the tail seat is provided with a groove, and the pumping ring is placed in the groove, so that the phenomenon that the bridge plug is inclined and cannot be centered when the bridge plug is pumped is avoided. Six threaded holes and six trapezoid channels are formed in the tail portion, the six threaded holes are fixed in a threaded fit mode with the anti-abrasion nails, and the six trapezoid channels are matched with the integral slip set. The middle part is provided with a threaded hole which is in threaded fit connection and fixation with the lower end center rod. The pumping ring is made of degradable rubber material, and the tailstock and the wear-resistant nails are made of magnesium-aluminum soluble alloy material.
The anchoring slips are of an integral slip structure and are cylindrical, and the inside of each slip is conical and matched with the conical surface of the secondary cone. As the outer diameter of the whole bridge plug is 75mm, the slips are distributed into six along the axial direction, the contact area with the sleeve is larger, the secondary cone push block moves downwards in a limiting manner to drive the anchoring slips to split, the slips expand outwards in the radial direction and move out, and the slips are quickly meshed into the sleeve to finish setting. The anchoring slips are characterized in that the carrier of the anchoring slips is made of a magnesium-aluminum soluble alloy material, six slip teeth are uniformly distributed on the surface of the anchoring slips, the slip teeth are designed into a cylindrical structure and made of a ceramic material, the engaging depth can be reduced, the damage to a sleeve can be relieved, the anchoring reliability of the slips can be improved, and the anchoring slips are easy to flow back.
The central rod group is formed by connecting an upper central rod and a lower central rod in a threaded fit manner and is stepped, so that the central rod group is better matched with a bridge plug, and the primary cone push block, the secondary cone push block and the anti-protruding protection ring can all move in a limiting manner on the central rod group. The center rod group, the first-stage cone push block, the second-stage cone push block and the anti-outburst protection ring are all made of magnesium-aluminum soluble alloy materials, and the second-stage cone push block and the anti-outburst protection ring are connected into a whole through threaded fit.
The sealing mechanism consists of a sealing glue ring and an anti-outburst protection ring, is integrally cylindrical, adopts a single structure form, and is conical inside so that the sealing mechanism is better matched with the conical surface of the primary cone push block. The sealant ring is made of Nitrile Butadiene Rubber (NBR) materials, has good oil resistance and extrusion resistance, has a service temperature ranging from-40 ℃ to 120 ℃, and can maintain enough elasticity and toughness in most types of oil well products. Can be quickly dissolved and returned out of the well bore within a period of time after the fracturing is completed.
Six trapezoid grooves are formed in the top of the releasing connector, a threaded hole in the upper end of the middle portion is fixedly connected with a setting tool release rod through threaded fit, the threaded hole in the upper end of the middle portion enables the releasing connector to be fixed on an upper end center rod through threaded fit, four pin holes are formed in the tail of the releasing connector and are fixedly connected with a primary cone push block through an anti-forward setting pin, and bridge plug forward setting is prevented. The releasing connector and the anti-front setting pin are made of magnesium-aluminum soluble alloy materials.
Four pin holes are formed in the top of the primary cone push block and are fixedly connected with the releasing connector through anti-front setting pins. Four spring pin self-locking devices are arranged in the rubber ring, so that rebound after sealing of the rubber ring can be avoided. The first-stage cone push block can move in a limiting mode on the upper-end center rod, four self-locking pin holes matched with spring pins are formed in the upper-end center rod, and the spring pins are made of magnesium-aluminum soluble alloy materials.
The beneficial effects of the invention are as follows:
1) Compared with the existing soluble bridge plug, the soluble bridge plug has the advantages of small outer diameter and simple structure, does not need to be put in a continuous oil pipe, and effectively solves the technical problem that the casing pipe in fracturing operation is seriously reduced in diameter and deformed without a usable separation tool.
2) The anchoring slip designed by the invention is of an integral slip structure, and as the outer diameter of the whole bridge plug is 75mm, the slips are distributed into six parts along the axial direction, the contact area with the sleeve is larger, the secondary cone push block moves downwards in a limiting manner to drive the integral slip group to split, the slips expand outwards in the radial direction and move out, and the slips are quickly meshed into the sleeve to finish setting. The slip carrier is made of a magnesium-aluminum soluble alloy material, six slip teeth are uniformly distributed on the surface of the slip carrier, the slip teeth are designed into a cylindrical structure and made of a ceramic material, so that the engaging depth can be reduced, the damage to a sleeve can be relieved, the anchoring reliability of the slip can be improved, and the slip is easy to flow back.
3) The sealing structure designed by the invention is in a single extrusion structure, the inside of the sealing structure is conical, so that the sealing structure is better matched with the conical surface of the primary cone push block, and the sealing structure is outwards expanded under the extrusion action of the primary cone push block, so that the sealing rubber ring is completely expanded to be closely attached to the inner wall of the sleeve, and the primary cone push block can be fixed in the rubber ring. The design can realize safer and better sealing effect under the condition of smaller outer diameter of the sealing rubber, can prolong the service life of the rubber cylinder and improves the pressure bearing performance. After the fracturing construction is finished, the first-stage cone push blocks inside the sealing rubber ring can be completely dissolved along with the sealing rubber ring.
4) The soluble bridge plug provided by the invention can directly and rapidly realize sealing separation without throwing a blocking ball to seat for sealing, and is easy to flow back in staged fracturing construction, and the full-drift diameter of a shaft is rapidly put into production after dissolution is completed.
Drawings
The present patent will be illustrated by way of the accompanying drawings, in which:
FIG. 1 is a schematic diagram of the overall structure of a soluble bridge plug of 114.3mm after 75mm of outer diameter expansion of a shale gas sleeve variable well staged fracturing of the present invention.
FIG. 2 is a cross-sectional view of the overall structure of a soluble bridge plug of the present invention with an outer diameter of 75mm after expansion of 114.3mm for a shale gas sleeve variable well staged fracturing.
Fig. 3 is a schematic view of the structure of the anchoring slips of fig. 1.
Fig. 4 is a schematic view of the seal mechanism of fig. 1.
In the figure, 1-releasing joint, 2-first-stage cone push block, 21-front-proof setting pin, 22-spring pin, 3-sealing mechanism, 31-sealing rubber ring, 32-front-proof protection ring, 4-second-stage cone push block, 5-central rod group, 51-upper central rod, 52-lower central rod, 6-anchoring slip, 61-slip carrier, 62-slip teeth, 7-tailstock, 71-wear-proof pin, device and 8-pumping ring.
Detailed Description
The invention will be further described with reference to the drawings and examples.
As shown in fig. 1, 2, 3 and 4, the soluble bridge plug with the outer diameter of 114.3mm after 75mm expansion for the shale gas sleeve variable well staged fracturing is formed by sequentially connecting a center rod group 5, a tailstock 7, a pumping ring 8, an anchoring slip 6, a secondary cone push block 4, a sealing mechanism 3, a primary cone push block 2 and a release joint 1. The pumping ring 8 is fixed on the tailstock 7, so that when pumping the bridge plug, the situation that the bridge plug is inclined and cannot center the sleeve is avoided, and pumping is assisted. The tailstock 7 is fixedly connected with the lower center rod 52 in a threaded fit manner, and the anchoring slips 6 matched with the tailstock 7 are sleeved on the center rod group 5. The sealing mechanism 3 is arranged at the middle position of the two-stage cone push block, the sealing rubber ring 31 is matched with the anti-outburst protection ring 32, the two-stage cone push block 4 and the anti-outburst protection ring 32 are connected into a whole in a threaded matched manner, and the sealing rubber ring can move in a limiting mode on the upper end center rod 51. The primary cone push block 2 is matched with the releasing connector 1, a limiting self-locking device is arranged in the primary cone push block 2 and is fixedly connected with the releasing connector 1 through an anti-front setting pin, the upper end center rod 51 is matched with the primary cone push block 2, and the primary cone push block 2 can move in a limiting mode on the upper end center rod 51. The releasing connector 1 is fixedly connected with the upper end central rod 51 in a threaded fit manner, is fixedly connected with the setting tool releasing rod in a threaded fit manner, and is released through threaded shearing. In the setting process, as the pins in the anti-advance setting pin holes are sheared, the primary cone push block 2, the sealing mechanism 3 and the secondary cone push block 4 of the bridge plug move downwards in a limiting manner along the central rod group 5, and the secondary cone push block 4 moves downwards in a limiting manner to drive the anchoring slips 6 to split and expand outwards in the radial direction so as to be quickly meshed with the casing wall to finish setting. After setting and anchoring, the primary cone push block 2 continues to move downwards in a limiting manner, and the sealant ring 312 expands outwards under the extrusion action of the primary cone push block 2 to generate large deformation expansion, so that the sealant ring 31 expands completely to be closely attached to the inner wall of the casing. After the sealing is completed, the primary cone push block 2 can be fixed inside the sealing glue ring 31. As the setting force continues to increase, the threads of the release joint 1, which are matched with the setting tool release rod, are sheared, and release is completed. The soluble bridge plug can realize contact sealing without throwing a blocking ball to seat, and the bridge plug can directly and quickly realize separation.
The working principle of the soluble bridge plug with the outer diameter of 114.3mm after 75mm expansion of the shale gas sleeve variable well staged fracturing is as follows: when the bridge plug is in use, the bridge plug is connected with the release rod of the setting tool in a threaded fit manner through the release connector, the bridge plug is pumped to a preset position by the cable, high-pressure gas generated by igniting gunpowder through cable ignition is filled in the combustion chamber, the push cylinder of the setting tool pushes the primary cone push block 2 to move downwards through the high-pressure gas in the setting tool, and when the anti-forward setting pin on the primary cone push block 2 is sheared, the primary cone push block, the sealing mechanism and the secondary cone push block of the bridge plug are enabled to move downwards in a limiting manner along the center rod group 8, and the center rod group 8 is provided with limiting pin holes 81. And the secondary cone push block 5 can drive the anchoring slips 6 to split and move outwards along the radial direction when moving downwards in a limiting manner, and rapidly engage into the casing wall to finish setting. After setting and anchoring, the first-stage cone push block continuously extrudes the sealing rubber ring 4 downwards, the sealing rubber ring 4 is subjected to large deformation after being stressed, the outer diameter is increased and expanded outwards, and the sealing rubber ring is tightly attached to the inner wall of the sleeve after a certain deformation is achieved, so that sealing and packing are realized. The primary cone push block 2 is locked with the sealing mechanism 4 under the action of the limiting self-locking device 12 while limiting downward movement, so that the sealing mechanism 4 is prevented from rebounding. After the sealing is completed, the primary cone push block 2 is fixed inside the sealing glue ring 31. When the bridge plug is stable in setting and the pushing pressure of the setting tool reaches a certain value, the releasing connector is broken to release the bridge plug, and the separation of the setting tool and the soluble bridge plug is completed. After the fracturing is completed, the soluble bridge plug can be completely dissolved under the condition of flowback fluid containing chloride ions in the well and formation temperature, and then the full diameter of the shaft is carried out.
Examples:
as shown in fig. 1, 2, 3 and 4, the shale gas sleeve variable well staged fracturing device comprises a soluble bridge plug with the outer diameter of 114.3mm after expansion of 75mm, a center rod group 5, a tailstock 7, a pumping ring 8, an anchoring slip 6, a secondary cone push block 4, a sealing mechanism 3, a primary cone push block 2 and a releasing joint 1, which are sequentially connected into a whole. The pumping ring 8 is fixed in a groove at the top of the tailstock 7, so that the situation that the bridge plug is inclined and cannot center the sleeve can be avoided when the bridge plug is pumped, and a degradable rubber material is adopted. The tailstock 7 is fixedly connected with the lower center rod 52 in a threaded fit manner, an anchoring slip 6 matched with the tailstock 7 is sleeved on the center rod group 5, and the tailstock 7 and the center rod group 5 are made of magnesium-aluminum soluble alloy materials. The sealing mechanism 3 is arranged at the middle position of the two-stage cone push block, the sealing rubber ring 31 is matched with the anti-outburst protection ring 32, the two-stage cone push block 4 and the anti-outburst protection ring 32 are connected into a whole in a threaded matched manner, and the sealing rubber ring can move in a limiting mode on the upper end center rod 51. Four spring pins 22 are arranged in the first-stage cone push block 2 and are fixedly connected with the release joint 1 through an anti-front setting pin 21, and the spring pins 22 and the anti-front setting pin 21 are made of magnesium-aluminum soluble alloy materials. The upper end central rod 51 is matched with the primary cone push block 2, and the primary cone push block 2 can move in a limiting mode on the upper end central rod 51. The releasing connector 1 is fixedly connected with the upper end central rod 51 in a threaded fit manner, is fixedly connected with the setting tool releasing rod in a threaded fit manner, and is released through threaded shearing. The primary cone push block 2, the secondary cone push block 4, the anti-projection protection ring 32 and the release connector 1 are all made of magnesium-aluminum soluble alloy materials. In the setting process, along with the shearing of the anti-forward setting pin 21 in the primary cone push block 2, the sealing mechanism 3 and the secondary cone push block 4 of the bridge plug move downwards in a limiting manner along the central rod group 5, and the secondary cone push block 4 moves downwards in a limiting manner to drive the anchoring slips 6 to split and expand outwards in the radial direction so as to quickly engage the casing wall to finish setting. After setting and anchoring, the primary cone push block 2 continues to move downwards in a limiting manner, and the sealant ring 31 is outwards expanded under the extrusion action of the primary cone push block 2 to generate large deformation expansion, so that the sealant ring 31 is completely expanded and expanded to be closely attached to the inner wall of the casing. The primary cone push block 2 moves downwards in a limiting manner until the four spring pins 22 are clamped into pin holes of the upper end central rod 51, self-locking is completed, and rebound after sealing of the rubber ring can be avoided. After the sealing is completed, the primary cone push block 2 can be fixed inside the sealing glue ring 31.
As shown in fig. 3, the anchoring slip 6 is of an integral slip structure and is cylindrical, and the inside of the slip is conical and matched with the conical surface of the secondary cone. As the outer diameter of the whole bridge plug is 75mm, the slips are distributed into six along the axial direction, the contact area with the sleeve is larger, the secondary cone push block 4 moves downwards in a limiting manner to drive the anchoring slips 6 to split, the slips expand outwards in the radial direction and move out, and the slips are quickly meshed into the sleeve to finish setting. The anchoring slips 6 are characterized in that the carrier 61 is made of a magnesium-aluminum soluble alloy material, six slip teeth 62 are uniformly distributed on the surface of the carrier, the slip teeth 62 are designed into a cylindrical structure and made of a ceramic material, so that the engaging depth can be reduced, the damage to a sleeve can be relieved, the anchoring reliability of the slips can be improved, and the slips are easy to flow back.
As shown in fig. 4, the sealing mechanism 3 is composed of a sealing glue ring 31 and an anti-protruding protection ring 32, and is cylindrical as a whole, and adopts a single structure, and the inside of the sealing mechanism is conical so as to better match with the conical surface of the primary cone push block 2. The sealing rubber ring 31 is made of nitrile rubber (NBR) material, has good oil resistance and extrusion resistance, has a service temperature ranging from-40 ℃ to 120 ℃, and can maintain enough elasticity and toughness in most types of oil well products. Can be quickly dissolved and returned out of the well bore within a period of time after the fracturing is completed.
The external diameter of the soluble bridge plug is 75mm, the soluble bridge plug can stably pass through the casing pipe when the casing pipe is severely reduced in diameter and deformed in fracturing operation, and the whole structure of the bridge plug is simple, the anchoring is reliable, and the running of a coiled tubing is not required to be considered. The slips are of an integral type slip structure, the contact area between the slips and the casing is larger, the slips carrier is made of a magnesium-aluminum soluble alloy material, six slip teeth are uniformly distributed on the surface of each slip, and the slips are made of a ceramic material, so that the engaging depth can be reduced, the damage to the casing is relieved, the anchoring reliability of the slips can be improved, and the slips are easy to flow back. The sealing rubber ring can realize safer and better sealing effect under the condition of smaller outer diameter, the pressure bearing performance is improved, and the dissolution speed is high. The bridge plug can directly and quickly realize sealing and packing functions without putting a plugging ball into a seat for sealing, and the full-diameter well bore is put into production quickly after dissolution is completed.
In the description of the present invention, it should be understood that, if any, terms such as upper, lower, left, right, inner, outer, radial, etc., are used as terms of orientation or positional relationship based on those shown in the drawings, rather than orientations that indicate or imply that the device or element being referred to must be characterized, and are constructed and operated in a particular orientation, and therefore the terms of positional relationship in the drawings are merely illustrative and should not be construed as limiting of the present patent.
The foregoing examples merely represent specific embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that, for those skilled in the art, several variations and modifications can be made without departing from the technical solution of the present application, which fall within the protection scope of the present application.
Claims (7)
1. The external diameter of the shale gas sleeve variable well staged fracturing is 114.3mm after expansion, and the shale gas sleeve variable well staged fracturing comprises a releasing joint 1, a sealing mechanism 3, an anchoring slip 6, a tailstock 7, a primary cone push block 2, a secondary cone push block 4, a pumping ring 8 and a center rod combination 5. The pumping ring 8 is fixed on the tailstock 7, the tailstock 7 is fixedly connected with the lower end central rod 52 in a threaded fit manner, and the anchoring slips 6 are matched with the tailstock 7 and sleeved on the central rod group 5. The sealing glue ring 31 is arranged at the middle position of the anti-outburst protection ring 32 and the primary cone push block 2 and is matched with the anti-outburst protection ring 32, and the secondary cone push block 4 and the anti-outburst protection ring 32 are connected into a whole in a threaded matched manner and can move in a limiting mode on the upper end center rod 51. The primary cone push block 2 is matched with the releasing connector 1, a limiting self-locking device is arranged in the primary cone push block 2 and is fixedly connected with the releasing connector 1 through an anti-front setting pin 21, an upper end center rod 51 is matched with the primary cone push block 2, and the primary cone push block 2 can move in a limiting mode on the upper end center rod 51. The releasing connector 1 is fixedly connected with the upper end central rod 51 in a threaded fit manner, and is fixedly connected with the setting tool release rod in a threaded fit manner. In the setting process, as the pins in the anti-advance setting pin holes are sheared, the primary cone push block 2, the sealing mechanism 3 and the secondary cone push block 4 of the bridge plug move downwards in a limiting manner along the central rod group 5, and the secondary cone push block 4 moves downwards in a limiting manner to drive the anchoring slips to split and expand outwards in the radial direction so as to quickly engage the casing wall to finish setting. After setting and anchoring, the primary cone push block 2 continues to move downwards in a limiting manner, and the sealant ring 31 is outwards expanded under the extrusion action of the primary cone push block 2 to generate large deformation expansion, so that the sealant ring 31 is completely expanded and expanded to be closely attached to the inner wall of the casing. After the sealing is completed, the primary cone push block 2 can be fixed inside the sealing glue ring 31.
2. The soluble bridge plug with the outer diameter of 114.3mm after 75mm expansion for the shale gas sleeve variable well staged fracturing according to claim 1, wherein the tail seat 7 is integrally conical, a groove is formed in the top of the tail seat, and the pumping ring 8 is placed in the groove, so that the situation that the bridge plug is inclined and cannot be centered when the bridge plug is pumped can be avoided. The tail 7 is provided with six threaded holes and six trapezoid channels, the six threaded holes are in threaded fit with the anti-wear nails 71, and the six trapezoid channels are matched with the anchoring slips 6. The middle part is provided with a threaded hole which is in threaded fit connection and fixation with the lower end central rod 52. The pumping ring 8 is made of degradable rubber material, and the tailstock 7 and the wear-resistant nails 71 are made of magnesium-aluminum soluble alloy material.
3. The soluble bridge plug with the outer diameter of 114.3mm after 75mm expansion for shale gas sleeve variable well staged fracturing according to claim 1, wherein the anchoring slips 6 are of an integral slip structure and are cylindrical, and the inside of each slip is conical and matched with the conical surface of the secondary cone. As the outer diameter of the whole bridge plug is 75mm, the slips are distributed into six along the axial direction, the contact area with the sleeve is larger, the secondary cone push block 4 moves downwards in a limiting manner to drive the anchoring slips 6 to split, the slips expand outwards in the radial direction and move out, and the slips are quickly meshed into the sleeve to finish setting. The anchoring slips 6 are characterized in that a carrier 61 is made of a magnesium-aluminum-soluble alloy material, six slip teeth 62 are uniformly distributed on the surface of the anchoring slips 6, and the slip teeth 62 are designed into a cylindrical structure and made of a ceramic material.
4. The soluble bridge plug with the outer diameter of 114.3mm after 75mm expansion for the shale gas sleeve variable well staged fracturing according to claim 1, wherein the center rod group 5 is formed by connecting an upper center rod 51 and a lower center rod 52 in a threaded fit manner, is stepped, is matched with the bridge plug better, and the primary cone push block 2, the secondary cone push block 4 and the anti-burst protection ring 32 can all move in a limiting manner on the center rod group 5. The center rod group 5, the primary cone push block 2, the secondary cone push block 4 and the anti-outburst protection ring 32 are all made of magnesium-aluminum soluble alloy materials, and the secondary cone push block 4 and the anti-outburst protection ring 32 are connected into a whole through threaded fit.
5. The soluble bridge plug with the outer diameter of 114.3mm after 75mm expansion for staged fracturing of the shale gas sleeve according to claim 1, wherein the sealing mechanism 3 is composed of a sealing rubber ring 31 and an anti-outburst protection ring 32, is integrally cylindrical, adopts a single structure form, and is conical so that the sealing mechanism is better matched with the conical surface of the primary cone push block 2. The sealing rubber ring 31 is made of nitrile rubber (NBR) material, has good oil resistance and extrusion resistance, has a service temperature ranging from-40 ℃ to 120 ℃, and can maintain enough elasticity and toughness in most types of oil well products. Can be quickly dissolved and returned out of the well bore within a period of time after the fracturing is completed.
6. The soluble bridge plug with the outer diameter of 114.3mm after 75mm expansion for shale gas sleeve well-changing staged fracturing according to claim 1, wherein six trapezoid grooves are formed in the top of the releasing connector 1, a threaded hole in the upper end of the middle part is fixedly connected with a setting tool release rod through threaded fit, a threaded hole in the lower end of the middle part is fixedly connected with an upper end center rod 51 through threaded fit, four pin holes are formed in the tail part and are fixedly connected with the primary cone push block 2 through an anti-advanced setting pin 21, and bridge plug advanced setting is prevented. The release fitting 1 and the anti-front setting pin 21 are each made of a magnesium-aluminum-soluble alloy material.
7. The soluble bridge plug with the outer diameter of 114.3mm after 75mm expansion for shale gas sleeve variable well staged fracturing according to claim 1, wherein four pin holes are formed in the top of the primary cone push block 2 and fixedly connected with the release joint 1 through the anti-front setting pin 21. Four spring pins 22 are arranged in the rubber ring self-locking device, so that rebound after sealing of the rubber ring can be avoided. Primary cone push
The block 2 can move in a limiting manner on the upper central rod 5, and the upper central rod 51 is provided with four self-locking pin holes matched with spring pins,
spring pin 22 is made of a magnesium aluminum soluble alloy material.
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|---|---|---|---|
| CN202310401382.8A CN116163684A (en) | 2023-04-15 | 2023-04-15 | Shale gas sleeve variable well staged fracturing soluble bridge plug with outer diameter of 75mm and 114.3mm after expansion |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310401382.8A CN116163684A (en) | 2023-04-15 | 2023-04-15 | Shale gas sleeve variable well staged fracturing soluble bridge plug with outer diameter of 75mm and 114.3mm after expansion |
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| CN116163684A true CN116163684A (en) | 2023-05-26 |
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| CN202310401382.8A Pending CN116163684A (en) | 2023-04-15 | 2023-04-15 | Shale gas sleeve variable well staged fracturing soluble bridge plug with outer diameter of 75mm and 114.3mm after expansion |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118008200A (en) * | 2024-04-08 | 2024-05-10 | 陕西海格瑞恩实业有限公司 | All-metal magnesium alloy ball seat |
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