CN115749677A - Small-diameter soluble bridge plug for segmented fracturing C-type shale casing deformation well - Google Patents
Small-diameter soluble bridge plug for segmented fracturing C-type shale casing deformation well Download PDFInfo
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- CN115749677A CN115749677A CN202211443874.5A CN202211443874A CN115749677A CN 115749677 A CN115749677 A CN 115749677A CN 202211443874 A CN202211443874 A CN 202211443874A CN 115749677 A CN115749677 A CN 115749677A
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Abstract
The invention discloses a small-diameter soluble bridge plug for a segmented fracturing C-class shale casing deformation well. The tailstock is matched with the auxiliary propelling device and fixed on the central rod. The slip group is connected with the tailstock through a hinge and is seated on the outburst-prevention cone push block. Two sides of the sealing rubber cylinder are provided with rubber cylinder protective umbrellas, liquid is pre-stored in the rubber cylinder protective umbrellas, and the rubber cylinder protective umbrellas are fixed between the anti-outburst setting pressure cylinder and the anti-outburst cone push block. The anti-protruding setting pressing cylinder, the sealing rubber cylinder and the anti-protruding cone pushing block can move downwards in a limiting mode along the central rod, and after the slip set is anchored and set, the sealing rubber cylinder can be continuously extruded to radially expand and cling to the pipe wall. The bridge plug can stably pass through a fracturing operation casing when the casing is severely reduced in diameter and deformed, and the liquid pre-stored in the sealing rubber cylinder can be changed into solid when the sealing rubber cylinder is radially expanded, so that the sealing performance of the rubber cylinder is better, the bearing is sufficient, and after the construction is finished, the solid in the rubber cylinder can be dissolved together with the rubber cylinder.
Description
Technical Field
The invention relates to the technical field of downhole tools for petroleum, natural gas and shale gas fracturing operation, in particular to a small-diameter soluble bridge plug for a staged fracturing C-class shale casing deformation well.
Background
As the target of oil and gas exploitation shifts to low-permeability and low-grade resources, the staged fracturing technology of the horizontal well becomes an important means for effectively improving the oil reservoir yield and the single well yield, and the bridge plug is one of important tools for fracturing operation and increasingly widely applied. The conventional drillable bridge plug is easy to cause underground accidents in the drilling and grinding process after fracturing construction, has high construction cost and can pollute a reservoir; the soluble bridge plug can be dissolved automatically without drilling and grinding, and the full drift diameter of the shaft is rapidly put into production after the dissolution is finished.
The soluble bridge plug mainly comprises a bridge plug main body, slips, a sealing rubber cylinder and the like. Because the outer diameter of the existing soluble bridge plug is more than 95mm, the soluble bridge plug cannot be pumped to a preset design position when the sleeve is seriously reduced in diameter and deformed in or after horizontal well fracturing. The sealing rubber cylinder has insufficient bearing capacity, is easy to rebound, cannot effectively realize the sealing and separating effect, is not thoroughly dissolved after construction, greatly influences the construction efficiency, and seriously hinders the rapid production of the gas well.
Disclosure of Invention
The invention aims to design a small-diameter soluble bridge plug of a staged fracturing C-type shale casing variable well, so that the small-diameter soluble bridge plug can stably pass through a fracturing operation casing when the casing is seriously reduced in diameter and deformed, can better seal a rubber cylinder when the rubber cylinder is greatly deformed and expanded, has enough pressure bearing capacity, can be completely dissolved after fracturing construction is finished, and can be quickly put into production in a full drift diameter mode of a shaft.
The technical scheme of the invention is as follows: the small-diameter soluble bridge plug comprises a releasing mechanism, a tailstock, a slip group, a sealing rubber cylinder, an anti-outburst setting pressing cylinder, an anti-outburst cone push block, an auxiliary propulsion device and a central rod. The auxiliary propulsion device is fixed on the tailstock, the tailstock is fixed on the center rod, and the slip group is fixedly connected with the tailstock through a hinge. The anti-outburst conical push block is matched with the slip set, the anti-outburst setting pressing cylinder and the anti-outburst conical push block are fixedly connected with the rubber cylinder protective umbrella through threads, the sealing rubber cylinder is fixed between the anti-outburst setting pressing cylinder and the anti-outburst conical push block, rubber cylinder protective umbrellas are arranged on two sides of the sealing rubber cylinder, and liquid is pre-stored in the sealing rubber cylinder. The releasing mechanism is matched with the outburst-prevention setting push block and fixed on the central rod, and the releasing mechanism is connected with the setting tool. And the anti-protrusion setting pressing cylinder, the sealing rubber cylinder and the anti-protrusion cone pushing block of the bridge plug move downwards along the central rod in a limiting manner along with the shearing of the pin in the anti-lifting setting pin hole, and the anti-protrusion cone pushing block moves downwards in a limiting manner to drive the slip set to move outwards along the radial direction and quickly engage into the wall of the casing to finish setting. After setting and anchoring, the sealing rubber cylinder is continuously extruded, and the sealing rubber cylinder radially expands under the action of stress to generate large deformation expansion, so that the sealing rubber cylinder is completely expanded and tightly attached to the inner wall of the sleeve. The outburst prevention seat sealing pressing cylinder is matched with the releasing mechanism, and a limiting self-locking device is arranged in the outburst prevention seat sealing pressing cylinder. In the structure, liquid is pre-stored in the sealing rubber cylinder in the process of large deformation and expansion from the initial outer diameter of 50mm to the inner wall of the close-fitting sleeve under the extrusion action, and after sealing and isolation are finished, the liquid pre-stored in the sealing rubber cylinder is changed into solid under a certain temperature condition underground to fill the whole rubber cylinder; after the fracturing construction is finished, the solid in the rubber cylinder can be completely dissolved along with the rubber cylinder.
The top of the tailstock is provided with three grooves, the middle part of the tailstock is matched and fixed with the auxiliary propelling device, so that when the bridge plug is pumped, the bridge plug can be prevented from inclining and being incapable of centering, and the bridge plug can be rapidly and auxiliarily propelled to reach a preset position. The tailstock is fixed on the central rod, and the bottom of the tailstock is connected with the slip group through a hinge. The tail seat, the auxiliary propulsion device and the central rod are all made of soluble materials.
The slips group be split type single slips group structure, because the bridging plug external diameter is 50mm, then the slips distributes along the axial for five, slips length is longer to pass through hinge fixed connection with the tailstock, slip group rotatable certain angle radially outwards shifts out when preventing protruding cone ejector pad spacing removal downwards, and nibbles fast and accomplish the setting in the casing wall. The carrier of the slip group is made of magnesium-based soluble alloy materials, slip teeth are uniformly distributed above the carrier, the slip teeth are designed into a sheet-shaped tooth structure and made of ceramic materials, the anchoring reliability of the slip can be improved, and the slip group is easy to return. The slips both ends are equipped with equidistant recess, are equipped with the hoop in the groove respectively for fixed slips group avoids the separation.
The outburst-prevention cone push block and the outburst-prevention setting pressing cylinder are both made of magnesium-based soluble alloy materials, and the outburst-prevention device is integrally designed by the outburst-prevention cone push block and the outburst-prevention setting pressing cylinder, so that materials can be saved, the contact stress between the sealing rubber cylinder and the sleeve can be improved, the sealing performance of the bridge plug is ensured, and the bridge plug is fixedly connected with the rubber cylinder protective umbrella. The outburst-prevention cone push block can move on the central rod, and the central rod is provided with a limiting boss. The anti-outburst seat sealing pressing cylinder is matched with the releasing mechanism, and the limiting self-locking device is arranged in the anti-outburst seat sealing pressing cylinder, so that the rebound of the rubber cylinder after sealing can be avoided.
The sealing rubber cylinder is fixed in the middle of the anti-protruding setting pressing cylinder and the anti-protruding cone push block, the three rubber cylinders used by the sealing rubber cylinder are combined into an upper rubber cylinder, a middle rubber cylinder and a lower rubber cylinder, the upper rubber cylinder and the lower rubber cylinder can play a role in protecting the middle rubber cylinder, liquid is pre-stored in the sealing rubber cylinder, rubber cylinder protection umbrellas are arranged on two sides of the sealing rubber cylinder, and a high-pressure sealing ring is arranged in each rubber cylinder protection umbrella. The liquid can be in a liquid state at the surface, and the liquid is converted into a solid under certain temperature conditions underground. When the sealing rubber cylinder is subjected to large deformation and radial expansion, liquid gradually becomes solid and the whole rubber cylinder is filled, so that the sealing performance of the sealing rubber cylinder can be improved, and the bearing capacity is better. After the construction is finished, the solid inside the sealing rubber cylinder can be completely dissolved along with the sealing rubber cylinder.
The sealing rubber cylinder adopts hydrogenated nitrile rubber as a main material of the water soluble rubber cylinder, and the hardness and the hydrophilic performance are adjusted by adding an accelerant TMTD and a military material. The hydrogenated nitrile rubber has high temperature resistance of 178 ℃, acid, alkali, corrosion and corrosion resistance; no hardening phenomenon and good super-elasticity performance.
The releasing mechanism is matched with the anti-protruding setting pressing barrel, the anti-protruding setting pressing barrel can move on the releasing mechanism in a limiting mode through the fixed connection of the anti-lifting setting pin, and the releasing mechanism is fixed on the central rod.
The invention has the beneficial effects that:
1) The soluble bridge plug has an outer diameter of 50mm, is smaller than the existing soluble bridge plug, does not need to consider the running of a continuous oil pipe, and can effectively solve the technical problem that no available separation tool is available for severe diameter reduction and deformation of a fracturing operation casing.
2) The sealing rubber cylinder structure designed by the invention is in a three-rubber-cylinder combination form and is divided into an upper rubber cylinder, a middle rubber cylinder and a lower rubber cylinder. The upper and lower rubber cylinders can protect the middle rubber cylinder, and the sealing performance of the bridge plug is ensured. The inside liquid that has in advance of sealed packing element, liquid can be the liquid state on ground, and turns into the solid by liquid under certain temperature condition in the pit, takes place under the condition of big deformation at the packing element, can prolong packing element life, can realize safer, better sealed effect, and the bearing capacity promotes. After the construction is finished, the solid in the sealing rubber cylinder can be completely dissolved along with the sealing rubber cylinder.
3) The slip set designed by the invention is of a split type single slip set structure, the outer diameter of the bridge plug is 50mm, five slips are axially distributed, the slips are long and fixedly connected with the tailstock through a hinge, and the slip set can rotate by a certain angle to move outwards radially when the anti-protruding cone push block moves downwards in a limiting mode and is quickly engaged into the wall of a casing to finish setting. The carrier of the slip group is made of magnesium-based soluble alloy materials, the slip teeth are designed into a sheet-shaped tooth structure and are made of ceramic materials, so that the engaging depth can be reduced, the damage to the sleeve can be reduced, the anchoring reliability of the slip can be improved, and the slip group is easy to return.
4) The soluble bridge plug of the invention does not need to put blocking balls into the seat for sealing, and the bridge plug can directly and quickly realize the sealing and separating effect for staged fracturing construction. The time and cost brought by bridge plug drilling and grinding are saved without drilling plug operation, the bridge plug is easy to flow back, and the full-drift-diameter rapid production of the shaft is realized after dissolution is finished.
Drawings
The invention will be illustrated by way of the accompanying drawings, in which:
fig. 1 is a schematic diagram of the overall structure of a small-diameter soluble bridge plug of a staged fracturing class C shale well of the present invention.
FIG. 2 is an overall structural cross-sectional view of a small diameter soluble bridge plug of a staged fracturing class C shale casing well of the present invention
FIG. 3 is a schematic view of the slip set of FIG. 1.
Fig. 4 is a schematic structural view of the sealant cartridge set of fig. 1.
In the figure, 1-releasing mechanism, 11-pin hole, 12-limit self-locking device, 13-advance-preventing setting pin hole, 2-protrusion-preventing setting pressing cylinder, 3-rubber cylinder protecting umbrella, 31-high-pressure sealing ring, 4-sealing rubber cylinder, 41-upper rubber cylinder, 42-middle rubber cylinder, 43-lower rubber cylinder, 44-liquid, 5-protrusion-preventing cone push block, 6-slip set, 61-slip carrier, 62-slip, 63-hoop, 7-tailstock, 71-auxiliary propulsion device, 8-center rod, 81-limit boss.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
As shown in fig. 1, fig. 2, fig. 3 and fig. 4, the small-diameter soluble bridge plug for a staged fracturing C-class shale casing well of the present invention comprises a releasing mechanism 1, a sealing rubber cylinder 4, a slip set 6, a tailstock 7, an anti-outburst setting pressing cylinder 2, an anti-outburst cone push block 5, an auxiliary propulsion device 71 and a central rod 8. The auxiliary propulsion device 71 is fixed on the tailstock 7, the tailstock 7 is fixed on the central rod 5, and the slip group 6 is fixedly connected with the tailstock 7 through a hinge. The outburst prevention cone push block 5 is matched with the slip group 6, the outburst prevention setting press cylinder 2 and the outburst prevention cone push block 5 are fixedly connected with the rubber cylinder protective umbrella 3 through threads, the sealing rubber cylinder 4 is fixed between the outburst prevention setting press cylinder 2 and the outburst prevention cone push block 5, the rubber cylinder protective umbrella 3 is arranged on two sides of the sealing rubber cylinder 4, and liquid 44 is prestored in the sealing rubber cylinder 4. The releasing mechanism 1 and the outburst prevention setting pressing cylinder 2 are matched with each other and fixed on the central rod 8, and the releasing mechanism 1 is connected with a setting tool. Along with the shearing of the pin in the anti-lifting forward setting pin hole 13, the anti-protruding setting pressing cylinder 2, the sealing rubber cylinder 7 and the anti-protruding cone pushing block 5 of the bridge plug move downwards along the central rod 8, the limiting boss 81 is arranged on the central rod 8, the anti-protruding cone pushing block 5 moves downwards in a limiting mode and drives the slip set 6 to move outwards in the radial direction, and the slip is quickly engaged into the wall of the casing to finish setting. After setting and anchoring, the sealing rubber cylinder 4 is continuously extruded, the sealing rubber cylinder 4 radially expands under the action of stress, and large deformation expansion occurs, so that the sealing rubber cylinder 4 is completely expanded and tightly attached to the inner wall of the casing. The outburst prevention setting pressing cylinder 2 is matched with the releasing mechanism 1, and a limiting self-locking device 12 is arranged in the outburst prevention setting pressing cylinder and can avoid rebound of the rubber cylinder after sealing 4. The liquid 44 prestored in the sealing rubber cylinder 4 becomes solid under a certain temperature condition underground, and is full of the whole sealing rubber cylinder 4, so that the sealing performance of the sealing rubber cylinder 4 can be improved, and the bearing capacity is better. After the construction is finished, the bridge plug can be completely dissolved, and the full drift diameter of the shaft can be rapidly put into production.
The working principle of the small-diameter soluble bridge plug of the staged fracturing C-class shale casing deformation well is as follows: when the bridge plug is used, the bridge plug is connected with the adapter through the shearing pin of the releasing mechanism 1, the bridge plug is pumped to a preset position through a cable, the cable is used for igniting gunpowder to generate high-pressure gas to fill the combustion chamber, the setting push cylinder pushes the anti-protruding setting press cylinder 2 to move downwards under the pushing of the high-pressure gas in the setting tool, when the setting pin on the anti-protruding setting press cylinder 2 is sheared, the anti-protruding setting press cylinder 2, the sealing rubber cylinder 4 and the anti-protruding cone push block 5 of the bridge plug can move downwards along the central rod 8, the central rod 8 is provided with the limiting boss 81, and when the anti-protruding cone push block 5 moves downwards in a limiting mode, the slip group 6 can be driven to move outwards in the radial direction, and the slip can rapidly engage into the wall of the casing to complete setting. After setting and anchoring, the sealing rubber cylinder 4 is continuously extruded, the sealing rubber cylinder 4 deforms after being stressed, the outer diameter is increased and expands outwards, and when a certain deformation is reached, the sealing rubber cylinder is tightly attached to the inner wall of the sleeve, so that sealing and isolation are realized. When the outburst prevention setting pressing cylinder 2 moves downwards in a limiting mode, the sealing rubber cylinder 4 is locked under the action of the limiting self-locking device 12, and the sealing rubber cylinder 4 is prevented from rebounding. When the bridge plug is stably set and the pushing pressure of the setting tool reaches a certain value, the releasing joint is broken to realize releasing, and the separation of the setting tool and the soluble bridge plug is completed.
The soluble bridge plug can realize contact sealing without throwing a blocking ball into a seat, and can directly and quickly realize the separation effect. After the sealing packing tube 4 is sealed and isolated, the liquid 44 pre-stored in the sealing packing tube 4 is changed into solid under certain temperature conditions. At this time, the bridge plug divides the inner space of the sleeve into an upper part and a lower part; after fracturing is completed, the soluble bridge plug can be completely dissolved in the flowback fluid containing chloride ions in the well and under the condition of stratum temperature, and then the full drift diameter of the shaft is carried out.
Example (b):
as shown in fig. 1 and fig. 2, the small-diameter soluble bridge plug for a staged fracturing C-class shale casing deformation well mainly comprises a releasing mechanism 1, a sealing rubber cylinder 4, a slip set 6, a tailstock 7, an anti-outburst cone push block 5, an anti-outburst setting pressing cylinder 2, an auxiliary propulsion device 71 and a central rod 8. The auxiliary propulsion device 71 is fixed on the tailstock 7, the tailstock 7 is fixed on the central rod 8, and the slip group 6 is fixedly connected with the tailstock 7 through a hinge. The outburst prevention cone push block 5 is matched with the slip group 6, the outburst prevention setting press cylinder 2 and the outburst prevention cone push block 5 are fixedly connected with the rubber cylinder protective umbrella 3 through threads, the sealing rubber cylinder 4 is fixed between the outburst prevention setting press cylinder 2 and the outburst prevention cone push block 5, the rubber cylinder protective umbrella 3 is arranged on two sides of the sealing rubber cylinder 4, and liquid 44 is prestored in the sealing rubber cylinder 4. The releasing mechanism 1 is matched with the outburst prevention setting pressing cylinder 2, fixed on the central rod 8 and connected with a setting tool. Along with the shearing of the pin in the anti-lifting advance setting pin hole 13, the anti-protruding setting pressing cylinder 2, the sealing rubber cylinder 4 and the anti-protruding cone pushing block 5 of the bridge plug move downwards in a limiting mode along the central rod 8, the central rod 8 is provided with a limiting boss 81, the anti-protruding cone pushing block 5 moves downwards in a limiting mode and drives the slip set 6 to move outwards in the radial direction, and the slip is quickly meshed into the wall of the casing to finish setting. After setting and anchoring, the sealing rubber cylinder 4 is continuously extruded, the sealing rubber cylinder 4 radially expands under the action of stress, and large deformation expansion occurs, so that the sealing rubber cylinder 4 is completely expanded and tightly attached to the inner wall of the casing. The outburst prevention setting pressing cylinder 2 is matched with the releasing mechanism 1, and a limiting self-locking device 12 is arranged in the outburst prevention setting pressing cylinder and can avoid rebound of the rubber cylinder after sealing 4. After the sealing and packing are finished, the liquid 44 prestored in the sealing rubber cylinder 4 becomes solid under a certain temperature condition underground, and is full of the whole sealing rubber cylinder 4, so that the sealing performance of the sealing rubber cylinder 4 can be improved, and the bearing capacity is better. After the construction is finished, the bridge plug can be completely dissolved, and the full drift diameter of the shaft can be rapidly put into production.
As shown in FIG. 3, the slip set 6 is comprised of a slip carrier 61, slip elements 62, and a collar 63. The slip group 6 is a split type single slip group structure, is long in length and is distributed with five slips along the axial direction. Slip teeth 62 are uniformly distributed above the slip carrier 61, the slip teeth 62 are designed into a sheet tooth-shaped structure, grooves with equal intervals are arranged at two ends of the slip set 7, and hoops 63 are respectively arranged in the grooves and used for fixing the slip set 6 to avoid separation. Because the outer diameter of the soluble bridge plug is 50mm, the radial expansion amount of the slip group 6 is very large, the slip group 6 is fixedly connected with the tailstock 8 through a hinge, the slip group 6 can move, when the outburst-prevention cone push block 5 moves downwards in a limiting mode, the hoop 63 is broken and drives the slip group 6 to rotate for a certain angle and move outwards in a radial mode, and the slip group 6 can be quickly meshed into the wall of a casing to finish anchoring.
As shown in fig. 4, the sealing glue cylinder group is composed of a sealing glue cylinder 4 and a glue cylinder protection 3 umbrella. The sealing rubber cylinder 4 is fixed in the middle of the outburst-prevention setting pressing cylinder 2 and the outburst-prevention cone push block 5, and the three rubber cylinders used by the sealing rubber cylinder 4 are divided into an upper rubber cylinder 41, a middle rubber cylinder 42 and a lower rubber cylinder 43. The upper and lower rubber cylinders can play a role in protecting the middle rubber cylinder 42, liquid 44 is pre-stored in the sealing rubber cylinder 4, rubber cylinder protective umbrellas 3 are arranged on two sides, and a high-pressure sealing ring 31 is arranged in each rubber cylinder protective umbrella 3. After setting and anchoring, the sealing rubber cylinder 4 is continuously extruded, the sealing rubber cylinder 4 is greatly deformed after being stressed by the initial outer diameter of 50mm, the outer diameter is increased and expands outwards, and when a certain deformation amount is reached, the sealing rubber cylinder is tightly attached to the inner wall of the sleeve. After the sealing and the isolation are finished, the liquid 44 prestored in the sealing rubber cylinder 4 can be converted into a solid at a certain temperature, and the inside of the rubber cylinder is filled with the solid, so that the sealing performance and the pressure bearing capacity of the sealing rubber cylinder 4 can be improved. The outburst prevention setting pressing cylinder 2 is matched with the releasing mechanism 1, and a limiting self-locking device 12 is arranged inside the outburst prevention setting pressing cylinder and can avoid rebound of the rubber cylinder after sealing.
As shown in fig. 3 and 4, the carrier of the slip set 7 is made of magnesium-based soluble alloy material, and the slip teeth 62 are designed into a sheet-shaped tooth structure and made of ceramic material, so that the engaging depth can be reduced, the damage to the sleeve can be reduced, the anchoring reliability of the slip can be improved, and the slip set is easy to flow back. The sealing rubber cylinder 4 adopts hydrogenated nitrile rubber as a main material of the water soluble rubber cylinder, and the hardness and the hydrophilic performance are adjusted by adding an accelerant TMTD and a military material, so that the sealing rubber cylinder becomes a fully soluble rubber cylinder; the liquid 44 is pre-stored in the packing rubber tube 4, the liquid 44 can be in a liquid state on the ground, the liquid is converted into solid under a certain temperature condition in the underground, and after construction is finished, the solid in the packing rubber tube 4 can be completely dissolved along with the packing rubber tube 4.
The soluble bridge plug has the advantages that the outer diameter of the soluble bridge plug is 50mm, the soluble bridge plug can stably pass through a fracturing operation casing pipe when the casing pipe is seriously reduced in diameter and deformed, and the continuous oil pipe does not need to be considered to be lowered. The slip group is a split type single slip group structure, the slip group is long in length and is fixedly connected with the tailstock through a hinge, and when the anti-protruding cone push block moves downwards in a limiting mode, the slip group can rotate by a certain angle and move outwards in the radial direction, and is quickly meshed into the wall of the casing to complete setting. The liquid is pre-stored in the sealing rubber cylinder, the liquid can be in a liquid state on the ground, and the liquid is converted into solid under a certain temperature condition in the underground to fill the inside of the rubber cylinder, so that the service life of the rubber cylinder is prolonged, a safer and better sealing effect can be realized under the condition of large deformation of the rubber cylinder, and the pressure bearing performance is improved; after the construction is finished, the solid in the sealing rubber cylinder can be completely dissolved along with the sealing rubber cylinder. Need not throw the shutoff ball and go into the seat sealed, the bridging plug can directly realize sealed separation effect fast, need not to bore the operation of plugging and has saved bridging plug and bore time and the cost that grinds and bring, easily flowback, and the pit shaft full latus rectum is put into operation fast after dissolving and accomplishing.
In the description of the present invention, it is to be understood that the terms upper, lower, left, right, inside, outside, radial and the like, if any, are used in the orientations and positional relationships indicated in the drawings, and are not intended to indicate or imply that the devices or elements being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore the terms describing the positional relationships in the drawings are used for illustrative purposes only and are not to be construed as limiting the present patent.
The above-mentioned embodiments only express the specific embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for those skilled in the art, without departing from the technical idea of the present application, several changes and modifications can be made, which are all within the protection scope of the present application.
Claims (6)
1. The small-diameter soluble bridge plug comprises a releasing mechanism (1), a sealing rubber cylinder (4), a slip set (6), a tailstock (7), an outburst-prevention setting pressing cylinder (2), an outburst-prevention cone push block (5), an auxiliary propulsion device (71) and a central rod (8). The auxiliary propulsion device (71) is fixed on the tailstock (7), the tailstock (7) is fixed on the central rod (8), and the slip group (6) is fixedly connected with the tailstock (7) through a hinge. Prevent abrupt cone ejector pad (5) and slips group (6) cooperation, prevent abrupt seat seal pressure section of thick bamboo (2) and prevent abrupt cone ejector pad (5) and all with packing element fender umbrella (3) screw thread fixed connection, sealed packing element (4) are preventing abrupt seat seal pressure section of thick bamboo (2) and prevent abrupt cone ejector pad (5) intermediate position fixed, sealed packing element (4) both sides all have packing element fender umbrella (3), sealed packing element (4) inside prestore has liquid (44). The releasing mechanism (1) is matched with the outburst-prevention setting pressing cylinder (2) and fixed on the central rod (8), and the releasing mechanism (1) is connected with a setting tool. The anti-protruding setting pressing cylinder (2), the sealing rubber cylinder (4) and the anti-protruding cone pushing block (5) of the bridge plug move downwards in a limiting mode along the central rod (8) along with the shearing of the pin in the anti-lifting setting pin hole (13), the anti-protruding cone pushing block (5) moves downwards in a limiting mode to drive the slip set (6) to move outwards in the radial direction, and the slip set is quickly meshed into the wall of a casing to finish setting. After setting and anchoring, the sealing rubber cylinder (4) is continuously extruded, the sealing rubber cylinder (4) radially expands under the action of stress to generate large deformation expansion, so that the sealing rubber cylinder (4) is completely expanded and tightly attached to the inner wall of the sleeve. The outburst prevention setting pressing cylinder (2) is matched with the releasing mechanism (1), and a limiting self-locking device (12) is arranged inside the outburst prevention setting pressing cylinder. After sealing and packing are finished, liquid (44) prestored in the sealing rubber cylinder (4) becomes solid under a certain temperature condition underground, and the whole rubber cylinder is filled. After the fracturing construction is finished, the bridge plug can be completely dissolved, and the full-bore rapid production of the shaft is realized.
2. The small-diameter soluble bridge plug for the staged fracturing C-class shale casing well according to claim 1, wherein the top of the tailstock (7) is provided with three grooves, and the middle part of the tailstock is matched and fixed with an auxiliary propulsion device (71), so that when the bridge plug is pumped, the bridge plug can be prevented from inclining and being not centered, and the bridge plug can be rapidly assisted to be propelled to reach a preset position. The tail seat (7) is fixed on the central rod (8), and the bottom of the tail seat (7) is connected with the slip set (6) through a hinge. The tailstock (7), the auxiliary propulsion device (71) and the central rod (8) are all made of soluble materials.
3. The small-diameter soluble bridge plug for the staged fracturing C-class shale casing deformation well according to claim 1, wherein the slip set (6) is of a split type single slip set structure, the slips are longer in length and five in axial distribution, and are fixedly connected with the tailstock (7) through hinges, when the anti-protruding cone push block (5) moves downwards in a limiting mode, the slip set (6) can rotate by a certain angle and move outwards in a radial mode, and the slip set can be rapidly meshed into the wall of a casing to complete setting. The carrier of the slip group (6) is made of magnesium-based soluble alloy materials, slip teeth (62) are uniformly distributed above the carrier, the slip teeth (62) are designed into a sheet-shaped tooth structure and made of ceramic materials, the anchoring reliability of the slip can be improved, and the slip is easy to flow back. The two ends of the slip group (6) are provided with grooves at equal intervals, and hoops (63) are respectively arranged in the grooves and used for fixing the slip group (6) to avoid separation.
4. The small-diameter soluble bridge plug for the staged fracturing class C shale casing change well according to the claim 1, characterized in that the packing rubber cylinder (4) is made of hydrogenated nitrile rubber as a main material, and an accelerant TMTD and military materials are added to adjust the hardness and the hydrophilic performance so as to make the packing rubber cylinder become a fully soluble packing rubber cylinder. The middle positions of the sealing rubber cylinder (4) in the anti-protruding setting pressing cylinder (2) and the anti-protruding cone push block (5) are fixed, the three rubber cylinder combination form used by the sealing rubber cylinder (4) is divided into an upper rubber cylinder (41), a middle rubber cylinder (42) and a lower rubber cylinder (43), and the upper rubber cylinder and the lower rubber cylinder can play a role in protecting the middle rubber cylinder (42) and guarantee the sealing performance of the bridge plug. The sealing rubber cylinder (4) is pre-stored with liquid (44) and rubber cylinder protective umbrellas (3) are arranged on both sides.
5. A small diameter soluble bridge plug for a staged fracturing class C shale casing well according to claim 4, wherein the packing rubber sleeve (4) is pre-filled with a liquid (44) therein. The liquid (44) may be in a liquid state at the surface and converted from a liquid to a solid at certain temperature conditions downhole. After sealing and packing are finished, liquid (44) prestored in the sealing rubber cylinder (4) becomes solid under a certain temperature condition, and the whole rubber cylinder is filled. After fracturing construction is finished, the solid inside the sealing rubber cylinder (4) can be dissolved together with the sealing rubber cylinder (4).
6. The small-diameter soluble bridge plug for the staged fracturing class-C shale casing variable well according to claim 1, wherein the outburst prevention setting pressing cylinder (2) and the outburst prevention cone pushing block (5) are both made of magnesium-based soluble alloy materials, the outburst prevention setting pressing cylinder and the outburst prevention cone pushing block are both designed integrally with an outburst prevention device, the outburst prevention cone pushing block (5) can move on the central rod (8), and the central rod (8) is provided with a limit boss (81). The outburst-prevention setting pressure cylinder (2) is matched with the releasing mechanism (1), and a limiting self-locking device (12) is arranged inside the outburst-prevention setting pressure cylinder and can prevent the rubber cylinder from rebounding after being sealed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211443874.5A CN115749677B (en) | 2022-11-18 | 2022-11-18 | Small-diameter soluble bridge plug for staged fracturing C-type shale casing variable well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211443874.5A CN115749677B (en) | 2022-11-18 | 2022-11-18 | Small-diameter soluble bridge plug for staged fracturing C-type shale casing variable well |
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| Publication Number | Publication Date |
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| CN115749677A true CN115749677A (en) | 2023-03-07 |
| CN115749677B CN115749677B (en) | 2023-07-04 |
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| CN202211443874.5A Active CN115749677B (en) | 2022-11-18 | 2022-11-18 | Small-diameter soluble bridge plug for staged fracturing C-type shale casing variable well |
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| CN (1) | CN115749677B (en) |
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| CN109990682A (en) * | 2019-05-06 | 2019-07-09 | 广西玉柴机器股份有限公司 | A kind of method and auxiliary mould measuring valve retainer circular runout |
| CN116163684A (en) * | 2023-04-15 | 2023-05-26 | 西南石油大学 | Shale gas sleeve variable well staged fracturing soluble bridge plug with outer diameter of 75mm and 114.3mm after expansion |
| CN116733413A (en) * | 2023-05-31 | 2023-09-12 | 江苏腾龙石化机械有限公司 | Guiding self-dissolving type soluble bridge plug |
| CN116906004A (en) * | 2023-09-08 | 2023-10-20 | 山东巨辉石油科技有限公司 | Packer for well cementation |
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| CN109990682A (en) * | 2019-05-06 | 2019-07-09 | 广西玉柴机器股份有限公司 | A kind of method and auxiliary mould measuring valve retainer circular runout |
| CN109990682B (en) * | 2019-05-06 | 2024-02-09 | 广西玉柴机器股份有限公司 | Method for measuring radial runout of valve seat ring and auxiliary tool |
| CN116163684A (en) * | 2023-04-15 | 2023-05-26 | 西南石油大学 | Shale gas sleeve variable well staged fracturing soluble bridge plug with outer diameter of 75mm and 114.3mm after expansion |
| CN116733413A (en) * | 2023-05-31 | 2023-09-12 | 江苏腾龙石化机械有限公司 | Guiding self-dissolving type soluble bridge plug |
| CN116733413B (en) * | 2023-05-31 | 2024-01-02 | 江苏腾龙石化机械有限公司 | Guiding self-dissolving type soluble bridge plug |
| CN116906004A (en) * | 2023-09-08 | 2023-10-20 | 山东巨辉石油科技有限公司 | Packer for well cementation |
| CN116906004B (en) * | 2023-09-08 | 2023-11-14 | 山东巨辉石油科技有限公司 | Packer for well cementation |
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