CN115749677B - Small-diameter soluble bridge plug for staged fracturing C-type shale casing variable well - Google Patents
Small-diameter soluble bridge plug for staged fracturing C-type shale casing variable well Download PDFInfo
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- CN115749677B CN115749677B CN202211443874.5A CN202211443874A CN115749677B CN 115749677 B CN115749677 B CN 115749677B CN 202211443874 A CN202211443874 A CN 202211443874A CN 115749677 B CN115749677 B CN 115749677B
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Abstract
The invention discloses a small-diameter soluble bridge plug for staged fracturing C-type shale casing variable well, which comprises a tailstock, a slip group, a sealing rubber cylinder, an anti-burst setting pressing cylinder, an anti-burst cone push block, an auxiliary propulsion device and a center rod. The tailstock is matched with the auxiliary propulsion device and is fixed on the center rod. The slip group is connected with the tailstock through a hinge and is seated on the anti-protruding cone push block. The two sides of the sealing rubber cylinder are provided with rubber cylinder protection umbrellas, liquid is pre-stored in the sealing rubber cylinder, and the sealing rubber cylinder is fixed between the anti-burst sealing cylinder and the anti-burst cone push block. The anti-burst setting pressure cylinder, the sealing rubber cylinder and the anti-burst cone push block can move downwards along the central rod in a limiting manner, and after the slip group is anchored and set, the sealing rubber cylinder is continuously extruded to be capable of expanding radially and clinging to the pipe wall. The bridge plug can stably pass through the sleeve when the sleeve is severely contracted and deformed in fracturing operation, and can change the liquid pre-stored in the sleeve into solid when the sealing sleeve is radially expanded, so that the sealing performance of the sleeve is better, the bearing pressure is enough, and the solid in the sleeve can be dissolved together with the sleeve after construction is finished.
Description
Technical Field
The invention relates to the technical field of downhole tools for petroleum and natural gas and shale gas fracturing operation, in particular to a small-diameter soluble bridge plug for staged fracturing C-type shale casing variable well.
Background
With the goal of oil and gas exploitation turning to low-permeability and low-grade resources, the horizontal well staged fracturing technology has become an important means for effectively improving the oil reservoir yield and the single well yield, and bridge plugs are one of important tools for fracturing operation, so that the horizontal well staged fracturing technology is 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 also can pollute a reservoir; the soluble bridge plug can be automatically dissolved without drilling and grinding, and the full-diameter well bore is rapidly put into production after dissolution is completed.
The soluble bridge plug mainly comprises a bridge plug main body, slips, a sealing rubber cylinder and the like. Because the external diameter of the existing soluble bridge plugs is above 95mm, 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. The sealing rubber cylinder has insufficient bearing capacity, is easy to rebound, cannot effectively realize sealing separation, is not thoroughly dissolved after construction, greatly influences the construction efficiency and seriously prevents a gas well from being put into production rapidly.
Disclosure of Invention
The invention aims to design a small-diameter soluble bridge plug for staged fracturing C-type shale casing variable well, so that the small-diameter soluble bridge plug can stably pass through a casing pipe in fracturing operation when the casing pipe is severely reduced in diameter and deformed, can be better sealed when a rubber cylinder is greatly deformed and expanded, is sufficient in bearing pressure of the rubber cylinder, and can be completely dissolved after the fracturing construction is finished, and the full-diameter of a well shaft is rapidly put into production.
The technical scheme of the invention is as follows: the small-diameter soluble bridge plug for staged fracturing C-type shale casing variable well comprises a releasing mechanism, a tailstock, a slip group, a sealing rubber cylinder, an anti-burst setting pressing cylinder, an anti-burst cone pushing block, an auxiliary pushing device and a center 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-burst cone push block is matched with the slip set, the anti-burst setting pressure cylinder and the anti-burst cone push block are fixedly connected with the thread of the rubber cylinder protection umbrella, the sealing rubber cylinder is fixed at the middle position of the anti-burst setting pressure cylinder and the anti-burst cone push block, the rubber cylinder protection umbrella is 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 anti-burst setting pushing block and fixed on the central rod, and the releasing mechanism is connected with the setting tool. Along with the shearing of the pins in the anti-advance setting pin holes, the anti-outburst setting pressure cylinder, the sealing rubber cylinder and the anti-outburst cone push block of the bridge plug move downwards in a limiting mode along the central rod, the anti-outburst cone push block moves downwards in a limiting mode to drive the slip set to move outwards in the radial direction, and the slip set is quickly meshed into the sleeve wall to finish setting. After the setting and anchoring, the sealing rubber cylinder is continuously extruded, and is radially expanded under the action of the force, so that the sealing rubber cylinder is greatly deformed and expanded, and is fully expanded to be closely attached to the inner wall of the sleeve. The anti-burst setting pressure cylinder is matched with the releasing mechanism, and a limiting self-locking device is arranged in the anti-burst setting pressure cylinder. In the structure, the liquid is pre-stored in the sealing rubber cylinder in the process of large deformation expansion from the initial outer diameter of 50mm to the inner wall of the close sleeve under the extrusion action, and after sealing and packing are completed, the pre-stored liquid in the sealing rubber cylinder becomes solid under the condition of a certain temperature in the well, and the whole rubber cylinder is filled; after the fracturing construction is finished, the solids in the rubber cylinder can be completely dissolved together with the rubber cylinder.
The tail seat top open and have three recess, the middle part is fixed with auxiliary propulsion device cooperation, can avoid the bridge plug slope unable centering when the pumping bridge plug, can assist fast again and impel the bridge plug and reach the preset position. The tailstock is fixed on the center pole, and tailstock bottom and slips group pass through hinged joint. The tailstock, auxiliary propulsion device and center rod are all made of soluble materials.
The slip group is of a split type single slip group structure, as the outer diameter of the bridge plug is 50mm, the slips are distributed into five parts along the axial direction, the length of the slips is long, the slips and the tailstock are fixedly connected through a hinge, and when the anti-protruding cone push block moves downwards in a limiting mode, the slip group can rotate for a certain angle to move outwards and is quickly meshed into the casing wall to finish setting. The carrier of the slip group is made of magnesium-based soluble alloy material, slip teeth are uniformly distributed above the carrier, the slip teeth are designed into a sheet tooth-shaped structure and made of ceramic material, so that the anchoring reliability of the slip can be improved, and the slip group is easy to flow back. The slips both ends are equipped with equidistant recess, are equipped with the hoop respectively in the groove for fixed slips group avoids the separation.
The anti-outburst cone push block and the anti-outburst setting cylinder are made of magnesium-based soluble alloy materials, and the anti-outburst cone push block and the anti-outburst setting cylinder are integrally designed, so that materials can be saved, contact stress between the sealing rubber cylinder and the sleeve can be improved, sealing performance of a bridge plug is guaranteed, and the bridge plug is fixedly connected with a rubber cylinder protection umbrella. The anti-protruding cone push block can move on a central rod, and a limiting boss is arranged on the central rod. The anti-burst setting pressure cylinder is matched with the releasing mechanism, and the limiting self-locking device is arranged in the anti-burst setting pressure cylinder to prevent the rubber cylinder from rebounding after being sealed.
The sealing rubber cylinder is fixed at the middle position of the anti-burst sealing pressing cylinder and the anti-burst cone pushing block, and the three-rubber cylinder combined form used by the sealing rubber cylinder is divided into an upper rubber cylinder, a middle rubber cylinder and a lower rubber cylinder, wherein 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 the rubber cylinder protection umbrellas. The liquid can be in a liquid state at the surface, and can be converted into solid under a certain temperature condition under the well. When the sealing rubber cylinder is radially expanded in large deformation, the liquid is gradually changed into solid, the whole rubber cylinder is filled, the sealing performance of the sealing rubber cylinder can be improved, and the pressure bearing capacity is better. After the construction is finished, the solid in the sealing rubber cylinder can be completely dissolved together with the sealing rubber cylinder.
The sealing rubber cylinder adopts hydrogenated nitrile rubber as a main body material of the hydrosol cylinder, and the hardness and the hydrophilic performance are regulated by adding an accelerator TMTD and a military material. The hydrogenated nitrile rubber has high temperature resistance up to 178 ℃, acid and alkali resistance and corrosion resistance and strong corrosion resistance; hardening phenomenon can not occur, and the super-elastic performance is good.
The releasing mechanism is matched with the anti-burst setting pressure cylinder and fixedly connected with the anti-burst setting pressure cylinder through an anti-burst setting pin, the anti-burst setting pressure cylinder can move in a limiting mode on the releasing mechanism, and the releasing mechanism is fixed on the center rod.
The beneficial effects of the invention are as follows:
1) The external diameter of the soluble bridge plug is 50mm, and compared with the existing soluble bridge plug, the soluble bridge plug has small external diameter, does not need to consider the running of a continuous oil pipe, and can effectively solve the technical problem that a separation tool is not available in the severe diameter-reducing deformation of the casing pipe in the fracturing operation.
2) The sealing rubber cylinder structure designed by the invention is in a three-rubber cylinder combined form and is divided into an upper rubber cylinder, a middle rubber cylinder and a lower rubber cylinder. The upper and lower rubber barrels can protect the middle rubber barrel and ensure the sealing performance of the bridge plug. The sealing rubber cylinder is pre-stored with liquid, the liquid can be in a liquid state on the ground, the liquid can be converted into solid under a certain temperature condition in the pit, the service life of the rubber cylinder can be prolonged under the condition that the rubber cylinder is greatly deformed, safer and better sealing effect can be realized, and the pressure bearing performance is improved. After the construction is finished, the solid in the sealing rubber cylinder can be completely dissolved together with the sealing rubber cylinder.
3) The slip group designed by the invention is of a split type single slip group structure, because the outer diameter of the bridge plug is 50mm, the number of slips is five along the axial direction, the length of the slips is longer, the slips are fixedly connected with the tailstock through the hinge, and when the anti-protruding cone push block moves downwards in a limiting way, the slip group can rotate for a certain angle to move outwards in a radial direction and is quickly meshed into the casing wall to finish setting. The carrier of the slip group is made of magnesium-based soluble alloy material, the slip teeth are designed into a platy tooth-shaped structure and made of ceramic material, so that the engaging depth can be reduced, the damage to the sleeve can be lightened, the anchoring reliability of the slip can be improved, and the slip is easy to flow back.
4) The soluble bridge plug of the invention can directly and rapidly realize the sealing separation effect without throwing a blocking ball to seat for sealing, and can carry out staged fracturing construction. The drilling and plugging operation is not needed, so that the time and cost brought by drilling and grinding of the bridge plug are saved, flowback is easy, and the full-drift diameter of the shaft is put into production rapidly 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 small diameter soluble bridge plug of a staged fracturing class C shale casing string well of the present invention.
FIG. 2 is a cross-sectional view of the overall structure of a small diameter soluble bridge plug of a staged fracturing class C shale casing string 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 packing element set of fig. 1.
In the figure, 1-releasing mechanism, 11-pin hole, 12-limit self-locking device, 13-anti-front seat pin hole, 2-anti-front seat pressing cylinder, 3-rubber cylinder protection 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-anti-front cone push block, 6-slip group, 61-slip carrier, 62-slip teeth, 63-hoop, 7-tailstock, 71-auxiliary propulsion device, 8-center rod and 81-limit boss.
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 small-diameter soluble bridge plug for the segmented fracturing type-C shale casing-changing well comprises a releasing mechanism 1, a packing sleeve 4, a slip group 6, a tailstock 7, an anti-burst setting pressure cylinder 2, an anti-burst cone push block 5, an auxiliary pushing device 71 and a center 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 anti-outburst cone push block 5 is matched with the slip group 6, the anti-outburst setting pressure cylinder 2 and the anti-outburst cone push block 5 are fixedly connected with the rubber cylinder protection umbrella 3 through threads, the sealing rubber cylinder 4 is fixed at the middle position of the anti-outburst setting pressure cylinder 2 and the anti-outburst cone push block 5, the rubber cylinder protection umbrella 3 is arranged on two sides of the sealing rubber cylinder 4, and liquid 44 is pre-stored in the sealing rubber cylinder 4. The releasing mechanism 1 is matched with the anti-burst setting pressure cylinder 2 and fixed on the central rod 8, and the releasing mechanism 1 is connected with the setting tool. Along with the shearing of the pins in the anti-advance setting pin holes 13, the anti-outburst setting pressure cylinder 2, the sealing rubber cylinder 4 and the anti-outburst cone push block 5 of the bridge plug move downwards along the central rod 8, the central rod 8 is provided with a limiting boss 81, the anti-outburst cone push block 5 moves downwards in a limiting manner and drives the slip group 6 to move outwards in the radial direction, and the slip group is quickly meshed into the casing wall to finish setting. After setting and anchoring, the sealing rubber cylinder 4 is continuously extruded, and the sealing rubber cylinder 4 radially expands under the action of the force, so that large deformation expansion occurs, and the sealing rubber cylinder 4 completely expands to be closely attached to the inner wall of the sleeve. The anti-burst setting pressure cylinder 2 is matched with the releasing mechanism 1, and a limiting self-locking device 12 is arranged in the anti-burst setting pressure cylinder to prevent the sealing rubber cylinder 4 from rebounding after sealing. The liquid 44 pre-stored in the sealing rubber cylinder 4 becomes solid under a certain temperature condition in the well, and the whole sealing rubber cylinder 4 is filled, so that the sealing performance of the sealing rubber cylinder 4 can be improved, and the pressure bearing capacity is better. After construction, the bridge plug can be completely dissolved, and the whole diameter of the shaft is put into production rapidly.
The invention relates to a small-diameter soluble bridge plug working principle of a section fracturing C-type shale casing-changing well, which comprises the following steps: 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 by the cable, the cable is ignited to ignite gunpowder to generate high-pressure gas to fill the combustion chamber, the setting pushing cylinder pushes the anti-burst setting pushing cylinder 2 to move downwards under the pushing of the high-pressure gas in the setting tool, when the setting pin on the anti-burst setting pushing cylinder 2 is sheared, the anti-burst setting pushing cylinder 2, the sealing rubber cylinder 4 and the anti-burst 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, and when the anti-burst cone pushing block 5 moves downwards in a limiting manner, the slip group 6 can be driven to move outwards in a radial direction, and the sleeve wall is quickly meshed to finish setting. After the 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 packing are realized. The anti-burst seal cylinder 2 is locked with the seal cylinder 4 under the action of the limiting self-locking device 12 while limiting downward movement, so that the seal cylinder 4 is prevented from rebounding. 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.
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. After the sealing packing of the sealing packing element 4 is completed, the liquid 44 prestored in the sealing packing element 4 is converted into solid under a certain temperature condition. At this time, the bridge plug divides the internal space of the sleeve into an upper part and a lower part; 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 and 2, the small-diameter soluble bridge plug for the segmented fracturing type-C shale casing-changing well mainly comprises a releasing mechanism 1, a sealing rubber cylinder 4, a slip group 6, a tailstock 7, an anti-burst cone push block 5, an anti-burst setting pressure cylinder 2, an auxiliary pushing device 71 and a center 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 anti-outburst cone push block 5 is matched with the slip group 6, the anti-outburst setting pressure cylinder 2 and the anti-outburst cone push block 5 are fixedly connected with the rubber cylinder protection umbrella 3 through threads, the sealing rubber cylinder 4 is fixed at the middle position of the anti-outburst setting pressure cylinder 2 and the anti-outburst cone push block 5, the rubber cylinder protection umbrella 3 is arranged on two sides of the sealing rubber cylinder 4, and liquid 44 is pre-stored in the sealing rubber cylinder 4. The releasing mechanism 1 is matched with the anti-burst setting pressure cylinder 2, fixed on the central rod 8 and connected with a setting tool. Along with the shearing of the pins in the anti-advance setting pin holes 13, the anti-outburst setting pressure cylinder 2, the sealing rubber cylinder 4 and the anti-outburst cone push block 5 of the bridge plug move downwards in a limiting mode along the central rod 8, a limiting boss 81 is arranged on the central rod 8, the anti-outburst cone push block 5 moves downwards in a limiting mode and drives the slip group 6 to move outwards in the radial direction, and the slip group is quickly meshed into the sleeve wall to finish setting. After setting and anchoring, the sealing rubber cylinder 4 is continuously extruded, and the sealing rubber cylinder 4 radially expands under the action of the force, so that large deformation expansion occurs, and the sealing rubber cylinder 4 completely expands to be closely attached to the inner wall of the sleeve. The anti-burst setting pressure cylinder 2 is matched with the releasing mechanism 1, and a limiting self-locking device 12 is arranged in the anti-burst setting pressure cylinder to prevent the rubber cylinder from rebounding after sealing 4. After the sealing and packing are finished, the liquid 44 prestored in the sealing rubber cylinder 4 becomes solid at a certain temperature under the well, and the whole sealing rubber cylinder 4 is filled, so that the sealing performance of the sealing rubber cylinder 4 can be improved, and the pressure bearing capacity is better. After construction, the bridge plug can be completely dissolved, and the whole diameter of the shaft is put into production rapidly.
As shown in fig. 3, the slip set 6 is formed by a slip carrier 61, slip teeth 62, and a hoop 63. The slip group 6 is of a split type single slip group structure, is long in length and is distributed in five directions. Slip carrier 61 top evenly distributed has slips tooth 62, and slips tooth 62 designs into slice form profile of tooth structure, and slips group 7 both ends are equipped with equidistant recess, are equipped with hoop 63 respectively in the groove for fixed slips group 6, avoid the separation. Because the external diameter of the soluble bridge plug is 50mm, the radial expansion amount of the slip group 6 is particularly large, the slip group 6 is fixedly connected with the tailstock 7 through a hinge, the slip group 6 is movable, and when the anti-protruding cone push block 5 moves downwards in a limiting manner, the hoop 63 breaks and drives the slip group 6 to rotate for a certain angle to move outwards in a radial direction, so that the slip group 6 can be quickly meshed into the casing wall to complete anchoring.
As shown in figure 4, the sealing rubber cylinder group consists of a sealing rubber cylinder 4 and a rubber cylinder protection 3 umbrella. The sealing rubber cylinder 4 is fixed in the middle of the anti-burst setting pressure cylinder 2 and the anti-burst cone push block 5, and the three-rubber-cylinder combined type 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. The upper and lower rubber barrels can protect the middle rubber barrel 42, liquid 44 is pre-stored in the sealing rubber barrel 4, rubber barrel protection umbrellas 3 are arranged on two sides of the sealing rubber barrel, and high-pressure sealing rings 31 are arranged in the rubber barrel protection umbrellas 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 50mm of initial outer diameter, the outer diameter is increased and is expanded outwards, and when a certain deformation amount is reached, the sealing rubber cylinder 4 is tightly attached to the inner wall of the sleeve. After the sealing and packing are completed, the liquid 44 prestored in the sealing rubber cylinder 4 can be converted into solid under a certain temperature condition, and the sealing performance and the bearing capacity of the sealing rubber cylinder 4 can be improved by filling the inside of the rubber cylinder. The anti-burst setting pressure cylinder 2 is matched with the releasing mechanism 1, and a limiting self-locking device 12 is arranged in the anti-burst setting pressure cylinder to prevent the rubber cylinder from rebounding after being sealed.
As shown in fig. 3 and 4, the carrier of the slip set 7 is made of magnesium-based soluble alloy material, the slip teeth 62 are designed into a sheet tooth-shaped structure and made of ceramic material, so that the engaging depth can be reduced, the damage to the casing can be reduced, the anchoring reliability of the slips can be improved, and the slip is easy to flow back. The sealing rubber cylinder 4 adopts hydrogenated nitrile rubber as a main material of the hydrosol cylinder, and the hardness and the hydrophilic performance are regulated by adding an accelerator TMTD and a military material, so that the hydrosol cylinder is formed; the liquid 44 is pre-stored in the sealing rubber cylinder 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 pit, and the solid in the sealing rubber cylinder 4 can be completely dissolved along with the sealing rubber cylinder 4 after construction is finished.
The technology is ingenious in that the external diameter of the soluble bridge plug is 50mm, and the soluble bridge plug can stably pass through the casing pipe in the fracturing operation when the casing pipe is severely reduced in diameter and deformed, and the running of the coiled tubing is not required to be considered. The slip group is of a split single slip group structure, the slip group is longer in length and fixedly connected with the tailstock 7 through a hinge, and when the anti-protruding cone push block 5 moves downwards in a limiting mode, the slip group can rotate a certain angle to move out radially outwards and rapidly engage into the casing wall to finish setting. The liquid is pre-stored in the sealing rubber cylinder 4, the liquid can be in a liquid state on the ground, and can be converted into solid under a certain temperature condition in the pit, so that the sealing rubber cylinder is full of the liquid, the service life of the rubber cylinder is prolonged, safer and better sealing effect can be realized under the condition that the rubber cylinder is greatly deformed, and the pressure-bearing performance is improved; after the construction is finished, the solid in the sealing rubber cylinder 4 can be completely dissolved together with the sealing rubber cylinder 4. The sealing separation effect can be directly and quickly realized by the bridge plug without putting the plugging balls into the seat for sealing, the drilling and grinding time and cost of the bridge plug are saved without drilling and plugging operation, flowback is easy, and the full-drift diameter of the shaft is quickly put into production after dissolution is finished.
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 (5)
1. The small-diameter soluble bridge plug for staged fracturing type-C shale casing-changing wells is characterized by comprising a releasing mechanism (1), a sealing rubber cylinder (4), a slip group (6), a tailstock (7), an anti-burst setting pressure cylinder (2), an anti-burst cone push block (5), an auxiliary pushing device (71) and a center 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 anti-outburst cone push block (5) is matched with the slip group (6), the anti-outburst setting pressure cylinder (2) and the anti-outburst cone push block (5) are fixedly connected with the rubber cylinder protection umbrella (3) through threads, the sealing rubber cylinder (4) is fixed at the middle position of the anti-outburst setting pressure cylinder (2) and the anti-outburst cone push block (5), the rubber cylinder protection umbrella (3) is arranged on two sides of the sealing rubber cylinder (4), and liquid (44) is pre-stored in the sealing rubber cylinder (4); the releasing mechanism (1) is matched with the anti-burst setting pressure cylinder (2) and fixed on the central rod (8), and the releasing mechanism (1) is connected with the setting tool; along with the shearing of the pins in the anti-advance setting pin holes (13), the anti-burst setting pressure cylinder (2), the sealing rubber cylinder (4) and the anti-burst cone push block (5) of the bridge plug move downwards in a limiting manner along the central rod (8), and the anti-burst cone push block (5) moves downwards in a limiting manner to drive the slip group (6) to move outwards in the radial direction so as to quickly engage the sleeve wall to finish setting; after setting and anchoring, continuously extruding the sealing rubber cylinder (4), radially expanding the sealing rubber cylinder (4) under the action of the stress, and performing large deformation expansion to ensure that the sealing rubber cylinder (4) is completely expanded to be closely attached to the inner wall of the sleeve; the anti-burst setting pressure cylinder (2) is matched with the releasing mechanism (1), and a limiting self-locking device (12) is arranged in the anti-burst setting pressure cylinder; after sealing and isolating are finished, the liquid (44) prestored in the sealing rubber cylinder (4) becomes solid under a certain temperature condition in the pit, and the whole rubber cylinder is filled; after the fracturing construction is finished, the bridge plug can be completely dissolved, and the full-drift diameter of the shaft is put into production rapidly;
the tail seat (7) is provided with three grooves at the top, the middle part is matched and fixed with the auxiliary propelling device (71), so that when the bridge plug is pumped, the bridge plug can be prevented from tilting and not centering, and the bridge plug can be rapidly assisted to be propelled to 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 group (6) through a hinge; the tailstock (7), the auxiliary propulsion device (71) and the central rod (8) are all made of soluble materials.
2. The small-diameter soluble bridge plug for the staged fracturing type-C shale casing-changing well according to claim 1, wherein the slip group (6) is of a split type single slip group structure, the lengths of the slips are longer and are distributed in five along the axial direction, the slips are fixedly connected with the tailstock (7) through hinges, and when the anti-protruding cone push block (5) moves downwards in a limiting mode, the slip group (6) can rotate for a certain angle to move out radially outwards and is quickly meshed into the casing wall to finish setting; the carrier of the slip group (6) is made of magnesium-based soluble alloy material, slip teeth (62) are uniformly distributed above the carrier, the slip teeth (62) are designed into a sheet tooth-shaped structure and made of ceramic material, so that 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 equidistant grooves, and hoops (63) are respectively arranged in the grooves and used for fixing the slip group (6) to avoid separation.
3. The small-diameter soluble bridge plug for staged fracturing type-C shale casing string well according to claim 1, wherein the sealing rubber cylinder (4) is formed by taking hydrogenated nitrile rubber as a main material, and adding an accelerator TMTD and a military material to adjust hardness and hydrophilic performance so as to form a full-soluble sol cylinder; the sealing rubber cylinder (4) is fixed at the middle position of the anti-outburst setting pressure cylinder (2) and the anti-outburst cone pushing block (5), and the three-rubber-cylinder combined type 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) so as to ensure the sealing performance of a bridge plug; liquid (44) is pre-stored in the sealing rubber cylinder (4), and rubber cylinder protection umbrellas (3) are arranged on two sides of the sealing rubber cylinder.
4. A small diameter soluble bridge plug for staged fracturing type C shale casing string well according to claim 3, wherein the sealing rubber cylinder (4) is pre-stored with liquid (44); the liquid (44) can be in a liquid state at the surface and can be converted into solid under a certain temperature condition under the well; after sealing and packing are completed, the liquid (44) prestored in the sealing rubber cylinder (4) becomes solid under a certain temperature condition, and the whole rubber cylinder is filled; after the fracturing construction is finished, the solids in the sealing rubber cylinder (4) can be dissolved together with the sealing rubber cylinder (4).
5. The small-diameter soluble bridge plug for staged fracturing type-C shale casing-changing wells, which is characterized in that the anti-outburst setting pressure cylinder (2) and the anti-outburst cone push block (5) are made of magnesium-based soluble alloy materials, the anti-outburst cone push block (5) can move on a center rod (8) through an integrated design, and a limiting boss (81) is arranged on the center rod (8); the anti-burst setting pressure cylinder (2) is matched with the releasing mechanism (1), and a limiting self-locking device (12) is arranged in the anti-burst setting pressure cylinder to prevent the rubber cylinder from rebounding after being sealed.
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| Application Number | Priority Date | Filing Date | Title |
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| 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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| 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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| CN115749677B true CN115749677B (en) | 2023-07-04 |
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| 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 |
| 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 |
| 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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| CN104632126B (en) * | 2014-12-26 | 2017-11-21 | 杰瑞能源服务有限公司 | A kind of big orifice bridging plug and its set method |
| CN207048723U (en) * | 2017-07-10 | 2018-02-27 | 山东胜利石油装备产业技术研究院 | A kind of new solvable bridging plug |
| CN108179991B (en) * | 2017-12-18 | 2020-08-07 | 中国石油天然气股份有限公司 | Bridge plug capable of being salvaged after fracturing |
| CN108316885B (en) * | 2018-04-27 | 2018-12-21 | 大庆市晟威机械制造有限公司 | A kind of bridge plug with combination packing element |
| CN111021985A (en) * | 2018-10-09 | 2020-04-17 | 中国石油天然气股份有限公司 | Bridge plug |
| CN109973045A (en) * | 2019-03-29 | 2019-07-05 | 东方宝麟科技发展(北京)有限公司 | Complete solvable bridge plug |
| WO2020226964A1 (en) * | 2019-05-03 | 2020-11-12 | NexGen Oil Tools Inc. | Dissolvable bridge plugs |
| CN210768697U (en) * | 2019-05-28 | 2020-06-16 | 克拉玛依市圣起钻采设备有限责任公司 | Anti-mis-setting soluble bridge plug |
| CN112253044A (en) * | 2020-11-05 | 2021-01-22 | 中国石油集团渤海钻探工程有限公司 | High-ductility small-diameter dissolvable bridge plug |
| CN113107422A (en) * | 2021-05-23 | 2021-07-13 | 吴帮民 | Underground soluble bridge plug |
| CN217380487U (en) * | 2022-05-19 | 2022-09-06 | 中国石油化工股份有限公司 | Single slips is stifled instrument temporarily in pit |
| CN115012876B (en) * | 2022-07-01 | 2023-08-11 | 西南石油大学 | Small-diameter large-deformation single slip type soluble bridge plug |
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