A drillable fracturing bridge plug

Abstract

The application discloses a drillable fracturing bridge plug capable of preventing drill sticking, relates to the technical field of bridge plugs, and comprises a center rod, a pulling part and a pulling groove, the center rod is provided with an anchoring part, an upper slip, a center rubber sleeve, an anti-sticking assembly and a lower slip, the bottom end of the center rod is provided with a connecting tray, and the connecting tray and a bottom support are matched with each other; the inner side of the anchoring part is provided with a self-explosion positioning assembly, and the center rubber sleeve is provided with the anti-sticking assembly; the anti-sticking assembly comprises a long rod which is connected with the center rubber sleeve, short rods which are connected to the two ends of the long rod, and a breaking rod which is inserted between the long rod and the short rods, and further comprises a shearing sleeve one, a shearing sleeve two and a connecting disc, the end of the short rod is provided with a matched sliding block, and the connecting disc is provided with an inclined sliding groove at the position corresponding to the sliding block; the deformation setting of the upper slip, the center rubber sleeve and the lower slip is sequentially completed through continuous pulling, and the integral connection of the center rubber sleeve and the two end parts is realized by using the long rod, so that the drill sticking phenomenon caused by the self-rotation of the parts during the drilling operation is avoided.

Description

Technical Field

[0001] This invention relates to the field of bridge plug technology, specifically a drillable fracturing bridge plug for preventing drill bit jamming. Background Technology

[0002] Bridge plugs are critical wellbore containment tools in oil and gas well exploration and development, designed to create a robust isolation barrier to withstand significant bidirectional pressure differentials. Their core function is to effectively separate fractured sections from the sections to be treated, ensuring that fracturing energy is precisely applied to the target formation, thereby preventing fracturing fluid cross-flow or damage to the modified reservoir.

[0003] Unlike traditional bridge plugs, drillable bridge plugs, after fracturing and plugging, can be efficiently milled into fine fragments using high-strength drilling tools and discharged from the wellbore with circulating fluid, thus restoring the full wellbore diameter and ensuring smooth subsequent production operations. However, existing drillable bridge plugs still face technical bottlenecks in actual drilling operations. During milling, the components are prone to rotation, leading to drill bit cutting failure and potentially causing complex downhole accidents such as stuck pipe due to rotation, severely impacting drilling efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a drillable fracturing bridge plug that prevents stuck drill bits, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A drillable fracturing bridge plug for preventing stuck drill bits includes a center rod. A pull-out portion is provided at the top of the center rod, and a pull-out groove is provided between the pull-out portion and the center rod. From top to bottom, the center rod is arranged with an anchor, upper slip, upper cone, center rubber sleeve, anti-sticking component, lower cone, lower slip, and base support. A connecting tray is provided at the bottom of the center rod, and the connecting tray cooperates with the base support. A self-destruct positioning component is provided inside the anchor. The upper slip and upper cone cooperate with each other, and the lower slip and lower cone cooperate with each other. The upper slip, upper cone, lower slip, and lower cone are symmetrically arranged. An anti-jamming assembly is provided between the central rubber cylinder and the upper and lower cones at both ends, located on both sides of the central rubber cylinder. The anti-jamming assembly includes a long rod connected to the central rubber cylinder, with short rods connected to both ends of the long rod. The ends of the long rod and the short rods that meet are hollow. A breaking rod is inserted between the long rod and the short rods. A shearing sleeve one is provided at the end of the short rod, and a shearing sleeve two is provided at the end of the long rod. A connecting plate is sleeved on the central rod at the end of the short rod. A matching slider is provided at the end of the short rod away from the shearing sleeve one. An inclined groove is provided on the connecting plate at the position corresponding to the matching slider.

[0007] As a further embodiment of the present invention: the inclined groove gradually increases in inclination depth from the outside to the inside, and the shear sleeve one and shear sleeve two work together to shear and destroy the rod, and at the same time push the short rod and the matching slider to move along the inclined groove toward the center of the connecting plate.

[0008] As a further embodiment of the present invention: the self-detonation positioning component includes a detonating wire embedded inside the anchoring member, the anchoring member having multiple sets of radial grooves evenly arranged circumferentially, an explosive charge placed inside the radial groove, the explosive charge being inserted into the detonating wire, a nail being inserted into the radial groove, the tail of the nail engaging with the radial groove and pressing against the surface of the explosive charge, and a sealing plate being provided at the port of the radial groove, the sealing plate engaging with the radial groove.

[0009] As a further embodiment of the present invention: multiple sets of plug-in posts are uniformly arranged on the contact surface between the upper clamp and the anchor, and the plug-in posts and the anchor are plugged into each other.

[0010] As a further embodiment of the present invention: the surfaces of the central rod and the anchoring part that cooperate with each other are provided with multiple sets of mating grooves, and a ratchet rack is installed in the mating grooves, with the ratchet teeth on the ratchet rack pointing downwards towards the central rubber cylinder.

[0011] As a further embodiment of the present invention: pressure-bearing rings are provided on both sides of the central rubber cylinder. The pressure-bearing rings include a first combination ring and a second combination ring that interlock with each other. Multiple insertion grooves are evenly provided on the inner rings of the first combination ring and the second combination ring. A mating ball is elastically inserted into the insertion groove. Multiple sets of positioning grooves are provided on the central rod. After the central rubber cylinder is compressed, the pressure-bearing rings carrying the mating balls cooperate with the positioning grooves to protect and bear pressure on the central rubber cylinder.

[0012] As a further embodiment of the present invention: a side rubber sleeve and a side pressure cone are sleeved on the central rod between the connecting plate and the pressure ring. A sleeve is provided on the side of the side pressure cone facing the connecting plate. The end of the sleeve abuts against the surface of the connecting plate. The long rod passes through the pressure ring and the side pressure cone in sequence and then connects to the short rod.

[0013] As a further embodiment of the present invention: the upper and lower clamps are evenly provided with multiple sets of interval grooves on their sides, the outer ring of the upper cone is provided with an upper mating plate corresponding to the interval groove of the upper clamp, the outer ring of the lower cone is provided with a lower mating plate corresponding to the interval of the lower clamp, and shearing flanges are provided on both sides of the mating part of the lower mating plate and the interval groove.

[0014] As a further embodiment of the present invention: the connecting tray is provided with multiple sets of connecting bolts, the connecting bolts and the base are mutually engaged, the central rod is provided with multiple sets of mating protrusions circumferentially at the part of the drawing groove, the bottom of the connecting tray is provided with a mating hole, and the inner circle of the mating hole is provided with a mating groove corresponding to the mating protrusion.

[0015] As a further embodiment of the present invention: anti-jamming protrusions are provided on the side of the upper cone and the lower cone facing the connecting plate, and anti-jamming grooves are correspondingly provided on the connecting plate.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] (1) The bridge plug is assembled with a solid central rod as its frame, and components such as the upper slip and the central rubber sleeve are assembled in sequence. After the lowering mechanism connects to the pull-out part and lowers the bridge plug to the specified depth, the self-destruct positioning component is triggered to detonate, locking the anchoring part to the inner wall of the well. Subsequently, the lowering mechanism applies a pulling force to the pull-out part, driving the upper slip, the central rubber sleeve and the lower slip to engage with the inner wall of the well: the upper slip first fits into the well wall, and then squeezes the central rubber sleeve to compress and deform it and complete the setting; after the central rubber sleeve reaches its maximum deformation, the lower slip and the lower cone squeeze each other and embed into the well wall, thereby forming a reliable upper and lower anchor at both ends of the central rubber sleeve. After the setting is completed, the lowering mechanism cuts off the pull-out part along the pull-out groove, thus completing the overall installation of the bridge plug.

[0018] (2) To ensure smooth unsealing and drilling operations, an anti-jamming component is installed inside the central rubber sleeve. This component is connected by long and short rods and, together with shear sleeve one, shear sleeve two, and a breaking rod, integrates the central rubber sleeve with the side components. In the initial setting stage, the pull-out force is transmitted to the short rod and the central rod through the connecting plate. At this time, the breaking rod is not broken, and the central rubber sleeve is not deformed by pressure. The pull-out force preferentially drives the upper slips and the upper cone, which, in conjunction with the anchoring component, causes the upper slips to open and embed into the inner wall of the wellbore. As the pull-out force continues to increase, the breaking rod is sheared, and the central rubber sleeve begins to deform under pressure. At the same time, both ends of the long rod slide into the inclined groove of the connecting plate. In subsequent fracturing and drilling operations, the long rod locks the central rubber sleeve, the side components, and the inclined groove of the connecting plate, effectively preventing the components from rotating and causing jamming during drilling.

[0019] (3) The inclined groove on the connecting plate is opened radially. When the breaking rod breaks under the tangential force of shear sleeve one and shear sleeve two, shear sleeve two simultaneously pushes shear sleeve one and the short rod to move along the inclined groove towards the central rod, causing the central rubber sleeve to be deformed under pressure. When the central rubber sleeve reaches the maximum deformation, the two ends of the long rod are precisely inserted into the inclined groove, thereby restricting the circumferential degree of freedom of the component and ensuring that no rotation occurs during subsequent drilling operations. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 This is a schematic diagram of the structure of the central rod in this invention.

[0022] Figure 3 for Figure 2 Enlarged structural diagram at point A in the middle.

[0023] Figure 4 for Figure 2 Enlarged structural diagram at point B.

[0024] Figure 5 This is a schematic diagram of the bottom structure of the connecting tray in this invention.

[0025] Figure 6 for Figure 5 Enlarged structural diagram at point C.

[0026] Figure 7 This is a cross-sectional structural diagram of the anchoring component in this invention.

[0027] Figure 8 This is a schematic diagram of the combined structure of the upper clasp and the upper cone in this invention.

[0028] Figure 9 This is a schematic diagram of the combined structure of the central rubber tube and the anti-jamming component in this invention.

[0029] Figure 10 This is a cross-sectional structural diagram of the central rubber tube and the anti-jamming component in this invention.

[0030] Figure 11 This is a schematic diagram of the disassembled structure of the pressure-bearing ring in this invention.

[0031] Figure 12 for Figure 10 Enlarged structural diagram at point D.

[0032] Figure 13 This is a schematic diagram of the separation structure of the long rod, short rod, and breaking rod in this invention.

[0033] Figure 14 This is a schematic diagram of the combined structure of the lower slip and the lower cone in this invention.

[0034] In the diagram: 1. Center rod; 10. Pull-out section; 100. Pull-out groove; 11. Butt joint protrusion; 12. Racket; 120. Mating groove; 13. Positioning groove; 14. Connecting tray; 140. Connecting bolt; 141. Butt joint hole; 142. Butt joint groove; 2. Anchor; 20. Detonating cord; 21. Explosive charge; 22. Nail; 23. Sealing plate; 3. Upper slip; 30. Insertion post; 31. Spacer groove; 4. Upper cone; 40. Upper mating plate; 5. Center rubber sleeve; 50. 500. Pressure ring; 501. Combination ring one; 502. Combination ring two; 503. Insertion groove; 504. Matching ball; 51. Side rubber sleeve; 52. Side pressure cone; 520. Sleeve; 53. Connecting plate; 530. Inclined slide groove; 6. Anti-jamming component; 60. Short rod; 600. Matching slider; 601. Shear sleeve one; 61. Long rod; 610. Shear sleeve two; 62. Breaking rod; 7. Lower cone; 70. Lower mating plate; 71. Shear flange; 8. Lower slip; 9. Base support. Detailed Implementation

[0035] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "upper", "lower", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0036] Furthermore, the terms "a" and "two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "a" or "two" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0037] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0038] The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0039] Example 1:

[0040] like Figures 1-3 , Figure 12 , Figure 13 As shown, a drillable fracturing bridge plug for preventing stuck drill bits includes a central rod 1. A pull-out portion 10 is provided at the top of the central rod 1, and a pull-out groove 100 is provided between the pull-out portion 10 and the central rod 1. From top to bottom, the central rod 1 is provided with an anchoring element 2, an upper slip 3, an upper cone 4, a central rubber sleeve 5, an anti-sticking component 6, a lower cone 7, a lower slip 8, and a base support 9. A connecting tray 14 is provided at the bottom of the central rod 1, and the connecting tray 14 cooperates with the base support 9. A self-destruct positioning component is provided inside the anchoring element 2. The upper slip 3 cooperates with the upper cone 4, and the lower slip 8 cooperates with the lower cone 7. The upper slip 3, upper cone 4, lower slip 8, and lower cone 7 are symmetrically arranged around the central rubber sleeve 5. On both sides, an anti-jamming component 6 is provided between the central rubber cylinder 5 and the upper cone 4 and lower cone 7 at both ends; the anti-jamming component 6 includes a long rod 61 connected to the central rubber cylinder 5, with short rods 60 connected to both ends of the long rod 61, the two ends of the long rod 61 and the short rod 60 being hollow, a breaking rod 62 inserted between the long rod 61 and the short rod 60, a shearing sleeve 601 at the end of the short rod 60, a shearing sleeve 610 at the end of the long rod 61, a connecting plate 53 sleeved on the central rod 1 at the end of the short rod 60, a matching slider 600 at the end of the short rod 60 away from the shearing sleeve 601, and an inclined groove 530 on the connecting plate 53 corresponding to the matching slider 600.

[0041] Specifically, the bridge plug is assembled with a solid central rod 1 as its frame, and components such as the upper slip 3 and the central rubber sleeve 5 are assembled sequentially. After the bridge plug is lowered to the designated depth by the lowering mechanism connected to the pull-out part 10, the self-destruct positioning component is triggered to detonate, locking the anchor 2 onto the inner wall of the wellbore. Subsequently, the lowering mechanism applies a pulling force to the pull-out part 10, driving the upper slip 3, the central rubber sleeve 5, and the lower slip 8 to engage with the inner wall of the wellbore in sequence: the upper slip 3 first fits into the well wall, then compresses and deforms the central rubber sleeve 5 to complete the setting; after the central rubber sleeve 5 reaches its maximum deformation, the lower slip 8 and the lower cone 7 press against each other and embed into the well wall, thereby forming reliable upper and lower anchoring at both ends of the central rubber sleeve 5. After the setting is completed, the lowering mechanism cuts off the pull-out part 10 along the pull-out groove 100, thus completing the overall installation of the bridge plug.

[0042] More specifically, to ensure smooth unsealing and drilling operations, an anti-jamming component 6 is installed inside the central rubber sleeve 5. This component is connected by long and short rods 60, and in conjunction with shear sleeve one 601, shear sleeve two 610, and breaking rod 62, it integrates the central rubber sleeve 5 with the side components. In the initial setting stage, the pull-out force is transmitted to the short rod 60 and the central rod 1 through the connecting plate 53. At this time, the breaking rod 62 is not broken, and the central rubber sleeve 5 is not deformed by pressure. The pull-out force preferentially drives the upper slip 3 and the upper cone 4, which, together with the anchoring component 2, causes the upper slip 3 to open and embed into the inner wall of the wellbore. As the pull-out force continues to increase, the breaking rod 62 is sheared, and the central rubber sleeve 5 begins to deform under pressure. At the same time, both ends of the long rod 61 slide into the inclined groove 530 of the connecting plate 53. In subsequent fracturing and drilling operations, the long rod 61 locks the central rubber sleeve 5, the side components, and the inclined groove of the connecting plate 53, effectively preventing the components from rotating and causing jamming during drilling.

[0043] Furthermore, such as Figure 12 , Figure 13 As shown, the inclined groove 530 gradually increases in inclination depth from the outside to the inside. After the shear sleeve 1 601 and shear sleeve 2 610 work together to shear the breaking rod 62, they simultaneously push the short rod 60 and the matching slider 600 to move along the inclined groove 530 toward the center of the connecting plate 53.

[0044] Specifically, the inclined groove 530 on the connecting plate 53 is radially formed. When the breaking rod 62 breaks under the tangential force of shear sleeve one 601 and shear sleeve two 610, shear sleeve two 610 simultaneously pushes shear sleeve one 601 and short rod 60 to move along the inclined groove 530 towards the central rod 1, causing the central rubber sleeve 5 to deform under pressure. When the central rubber sleeve 5 reaches its maximum deformation, both ends of the long rod 61 are precisely inserted into the inclined groove 530, thereby restricting the circumferential freedom of the component and ensuring that it does not rotate during subsequent drilling operations.

[0045] Furthermore, such as Figure 7 As shown, the self-detonation positioning assembly includes a detonating wire 20 embedded inside the anchor 2. The anchor 2 has multiple sets of radial grooves evenly arranged around its circumference. An explosive charge 21 is placed inside the radial groove. The explosive charge 21 is inserted into the detonating wire 20. A nail 22 is inserted into the radial groove. The tail of the nail 22 cooperates with the radial groove and presses against the surface of the explosive charge 21. A sealing plate 23 is provided at the port of the radial groove. The sealing plate 23 cooperates with the radial groove.

[0046] Specifically, once the anchor 2 reaches the predetermined depth, the detonating charge 21 drives the nail 22 to be driven into the inner wall of the wellbore at high speed, thus firmly fixing the anchor 2. Based on this, a pulling force is then applied to the pull-out section 10 to formally initiate the setting and sealing procedure.

[0047] Furthermore, such as Figure 7 , Figure 8As shown, multiple sets of plug-in posts 30 are evenly arranged on the contact surface between the upper clip 3 and the anchor 2, and the plug-in posts 30 and the anchor 2 are plugged into each other.

[0048] Furthermore, such as Figure 1 , Figure 4 As shown, the surfaces of the central rod 1 and the anchoring part that cooperate with each other are provided with multiple sets of mating grooves 120. A ratchet rack 12 is installed in the mating groove 120, and the ratchet teeth on the ratchet rack 12 point downwards towards the central rubber cylinder 5.

[0049] Specifically, during the pulling force compression of the central rubber sleeve 5, the central rod 1 is pulled upwards, and the ratchet 12 on its outer side forms a one-way limiting with the top of the anchoring part, making the two tightly locked. This structure can effectively prevent the central rod 1 from being squeezed out and falling off under the high pressure of the fracturing fluid after setting. Compared with the existing technology that uses a hollow central tube in conjunction with fracturing balls for isolation and sealing, this application adopts a structure in which the ratchet 12 and the solid central rod 1 are combined, eliminating the ball-dropping process, significantly simplifying the fracturing operation process and improving construction efficiency.

[0050] Example 2:

[0051] This embodiment is a further improvement and limitation on Embodiment 1 based on Embodiment 1.

[0052] An embodiment including all the components in Example 1, further comprising:

[0053] Furthermore, such as Figures 9-11 As shown, pressure-bearing rings 50 are also provided on both sides of the central rubber cylinder 5. The pressure-bearing rings 50 include a first combination ring 500 and a second combination ring 501 that interlock with each other. Multiple insertion grooves 502 are evenly provided on the inner rings of the first combination ring 500 and the second combination ring 501. A mating ball 503 is elastically inserted into the insertion groove 502. Multiple sets of positioning grooves 13 are provided on the central rod 1. After the central rubber cylinder 5 is compressed, the pressure-bearing rings 50 carrying the mating balls 503 cooperate with the positioning grooves 13 to protect and bear pressure on the central rubber cylinder 5.

[0054] Specifically, the central rubber sleeve 5 is equipped with pressure-bearing rings 50 at both ends, which are installed through combination ring one 500, combination ring two 501, and mating ball 503. When the central rubber sleeve 5 is deformed under pressure, the pressure-bearing rings 50 on both sides slide along the central rod 1 and are embedded in the positioning groove 13. This design provides support and protection for the deformed central rubber sleeve 5, effectively preventing it from undergoing shoulder deformation due to edge extrusion under high pressure differential, thereby ensuring the reliability of the seal.

[0055] Furthermore, such as Figure 10As shown, a side rubber sleeve 51 and a side pressure cone 52 are sleeved on the central rod 1 between the connecting plate 53 and the pressure ring 50. A sleeve 520 is provided on the side of the side pressure cone 52 facing the connecting plate 53. The end of the sleeve 520 abuts against the surface of the connecting plate 53. The long rod 61 passes through the pressure ring 50 and the side pressure cone 52 in sequence and is connected to the short rod 60.

[0056] Specifically, the long rod 61 synchronously connects the central rubber sleeve 5, the side rubber sleeve 51, and the side pressure cone 52. The side pressure cone 52 is connected to the connecting plate 53 via a sleeve 520. Space is reserved on the outside of the sleeve 520 to allow the short rod 60 and the matching slider 600 to move along the inclined groove 530 after the breaking rod 62 cuts it. This structure allows the end of the long rod 61 to smoothly insert into the inclined groove 530 as the central rubber sleeve 5 is compressed and deformed, locking the connecting plate 53 and the central rubber sleeve 5 as a whole, facilitating subsequent drilling operations.

[0057] Furthermore, such as Figure 8 , Figure 14 As shown, the upper slip 3 and the lower slip 8 are evenly provided with multiple sets of interval grooves 31 on their sides. The outer ring of the upper cone 4 is provided with an upper mating plate 40 corresponding to the interval groove 31 of the upper slip 3. The outer ring of the lower cone 7 is provided with a lower mating plate 70 corresponding to the interval of the lower slip 8. Shear flanges 71 are provided on both sides of the mating part of the lower mating plate 70 and the interval groove 31.

[0058] Specifically, the upper mating plate 40 and the lower mating plate 70 form limiting fits with the upper slip 3 and the lower slip 8, respectively. During the unsealing and drilling stage, this structure significantly enhances the integrity between the upper slip 3, the upper cone 4, the lower slip 8, and the lower cone 7, further eliminating the risk of stuck drill bit caused by component rotation. At the same time, shear flanges 71 are provided on both sides of the lower mating plate 70 between the lower slip 8 and the lower cone 7. After the upper slip 3 and the central rubber sleeve 5 have completed deformation and setting, the shear flanges 71 will be cut off. At this time, the lower slip 8 will be embedded into the inner wall of the wellbore, and finally the pull-out groove 100 of the central rod 1 will break, completing the overall setting of the bridge plug.

[0059] Furthermore, such as Figure 2 , Figure 3 , Figure 5 , Figure 6 As shown, the connecting tray 14 is provided with multiple sets of connecting bolts 140, which cooperate with the base 9. The center rod 1 is provided with multiple sets of mating protrusions 11 around the part of the drawing groove 100. The bottom of the connecting tray 14 is provided with a mating hole 141, and the inner ring of the mating hole 141 is provided with a mating groove 142 corresponding to the mating protrusion 11.

[0060] Specifically, when the upper bridge plug is drilled down to the connecting tray 14 at the bottom of the center rod 1, the connecting tray 14 slides down onto the center rod 1 at the top of the lower bridge plug. The mating hole 141 at the bottom of the connecting tray 14 mates with the top of the lower center rod 1. During the rotation of the drilling and milling tool, the mating protrusion 11 and the mating groove 142 engage and lock, effectively preventing the connecting tray 14 from continuously rotating and avoiding drill jamming.

[0061] Furthermore, the upper cone 4 and the lower cone 7 are provided with anti-jamming protrusions on the side facing the connecting plate 53, and the connecting plate 53 is provided with corresponding anti-jamming grooves.

[0062] The working principle of this invention embodiment is as follows:

[0063] like Figures 1-14As shown, the bridge plug is assembled with a solid central rod 1 as its frame, and components such as the upper slip 3 and the central rubber sleeve 5 are assembled sequentially. After the bridge plug is lowered to the designated depth by the lowering mechanism connected to the pull-out part 10, the self-destruct positioning component is triggered to detonate, locking the anchor 2 to the inner wall of the wellbore. Subsequently, the lowering mechanism applies a pulling force to the pull-out part 10, driving the upper slip 3, the central rubber sleeve 5, and the lower slip 8 to engage with the inner wall of the wellbore: the upper slip 3 first fits into the well wall, then compresses and deforms the central rubber sleeve 5, completing the setting; after the central rubber sleeve 5 reaches its maximum deformation, the lower slip 8 and the lower cone 7 press against each other and embed into the well wall, thus forming reliable upper and lower anchoring at both ends of the central rubber sleeve 5. After the setting is completed, the lowering mechanism cuts off the pull-out part 10 along the pull-out groove 100, thus completing the overall installation of the bridge plug. To ensure smooth unsealing and drilling operations, an anti-jamming component 6 is installed inside the central rubber sleeve 5. This component is connected by long and short rods 60, and in conjunction with shear sleeve one 601, shear sleeve two 610, and breaking rod 62, integrates the central rubber sleeve 5 with the side components. In the initial setting phase, the pull-out force is transmitted through the connecting plate 53 to the short rod 60 and the central rod 1. At this time, the breaking rod 62 is not broken, and the central rubber sleeve 5 is not deformed under pressure. The pull-out force preferentially drives the upper slips 3 and the upper cone 4, which, in conjunction with the anchoring component 2, cause the upper slips 3 to open and embed into the inner wall of the wellbore. As the pull-out force continues to increase, the breaking rod 62 is sheared off, and the central rubber sleeve 5 begins to deform under pressure. Simultaneously, both ends of the long rod 61 slide into the inclined grooves 530 of the connecting plate 53. In subsequent fracturing and drilling operations, the long rod 61 locks the central rubber sleeve 5, the side components, and the inclined grooves of the connecting plate 53, effectively preventing the components from rotating and causing jamming during drilling. The inclined grooves 530 on the connecting plate 53 are radially arranged. When the breaking rod 62 breaks under the tangential force of shear sleeve 601 and shear sleeve 610, shear sleeve 610 simultaneously pushes shear sleeve 601 and short rod 60 along the inclined groove 530 towards the central rod 1, causing the central rubber sleeve 5 to deform under pressure. When the central rubber sleeve 5 reaches its maximum deformation, both ends of the long rod 61 are precisely inserted into the inclined groove 530, thereby restricting the circumferential freedom of the component and ensuring that it does not rotate during subsequent drilling operations. During the pulling force that compresses the central rubber sleeve 5, the central rod 1 is pulled upward, and the ratchet 12 on its outer side forms a one-way limit with the top of the anchoring part, making the two tightly locked. This structure can effectively prevent the central rod 1 from being squeezed out and falling off under the high pressure of the fracturing fluid after setting. Compared with the existing technology that uses a hollow central tube in conjunction with fracturing balls for isolation and sealing, this application uses a structure that uses a ratchet 12 in conjunction with a solid central rod 1, which eliminates the ball dropping process, significantly simplifies the fracturing operation process and improves construction efficiency. The central rubber cylinder 5 has pressure-bearing rings 50 at both ends, which are installed by combination ring one 500, combination ring two 501, and mating ball 503. When the central rubber cylinder 5 is deformed by pressure, the pressure-bearing rings 50 on both sides slide along the central rod 1 and are embedded in the positioning groove 13.This design provides support and protection for the deformed rubber sleeve, effectively preventing shoulder deformation due to edge extrusion under high pressure differential, thus ensuring the reliability of the seal. The long rod 61 synchronously connects the central rubber sleeve 5, the side rubber sleeves 51, and the side pressure cone 52. The side pressure cone 52 is connected to the connecting disc 53 via a sleeve 520. Space is reserved on the outside of the sleeve 520 to allow the short rod 60 and the matching slider 600 to move along the inclined groove 530 after the breaking rod 62 cuts it. This structure allows the end of the long rod 61 to smoothly insert into the inclined groove 530 as the central rubber sleeve 5 is compressed and deformed, locking the connecting disc 53 and the central rubber sleeve 5 as a whole, facilitating subsequent drilling operations.

[0064] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0065] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A drillable fracturing bridge plug for preventing stuck drill bits, characterized in that, The device includes a central rod (1), a pull-out part (10) at the top of the central rod (1), a pull-out groove (100) between the pull-out part (10) and the central rod (1), and an anchor (2), an upper slip (3), an upper cone (4), a central rubber cylinder (5), an anti-jamming component (6), a lower cone (7), a lower slip (8), and a bottom support (9) arranged sequentially from top to bottom on the central rod (1). A connecting tray (14) is provided at the bottom of the central rod (1), and the connecting tray (14) and the bottom support (9) cooperate with each other. The inner side of the anchor (2) is provided with a self-destruct positioning component. The upper slip (3) and the upper cone (4) cooperate with each other. The lower slip (8) and the lower cone (7) cooperate with each other. The upper slip (3), the upper cone (4) and the lower slip (8) and the lower cone (7) are symmetrically arranged on both sides of the central rubber cylinder (5). The central rubber cylinder (5) and the upper cone (4) and the lower cone (7) at both ends are provided with an anti-jamming component (6). The anti-jamming component (6) includes a long rod (61) connected to the central rubber cylinder (5). Short rods (60) are connected to both ends of the long rod (61). The two ends of the long rod (61) and the short rod (60) that meet each other are hollow. A breaking rod (62) is inserted between the long rod (61) and the short rod (60). A shearing sleeve one (601) is provided at the end of the short rod (60). A shearing sleeve two (610) is provided at the end of the long rod (61). A connecting plate (53) is sleeved on the central rod (1) at the end of the short rod (60). A matching slider (600) is provided at the end of the short rod (60) away from the shearing sleeve one (601). An inclined groove (530) is provided on the connecting plate (53) at the part corresponding to the matching slider (600).

2. The drillable fracturing bridge plug for preventing stuck drill bit according to claim 1, characterized in that, The inclined groove (530) gradually increases in inclination depth from the outside to the inside. After the shear sleeve one (601) and shear sleeve two (610) work together to shear the broken rod (62), they simultaneously push the short rod (60) and the matching slider (600) to move along the inclined groove (530) toward the center of the connecting plate (53).

3. A drillable fracturing bridge plug for preventing stuck drill bit according to claim 1, characterized in that, The self-detonation positioning component includes a detonating wire (20) embedded inside the anchor (2). The anchor (2) has multiple sets of radial grooves evenly arranged around its circumference. A charge (21) is placed inside the radial groove. The charge (21) is inserted into the detonating wire (20). A nail (22) is inserted into the radial groove. The tail of the nail (22) cooperates with the radial groove and presses against the surface of the charge (21). A sealing plate (23) is provided at the port of the radial groove. The sealing plate (23) cooperates with the radial groove.

4. A drillable fracturing bridge plug for preventing stuck drill bit according to claim 1, characterized in that, Multiple sets of plug-in posts (30) are evenly arranged on the contact surface between the upper clasp (3) and the anchor (2), and the plug-in posts (30) and the anchor (2) are plugged into each other.

5. A drillable fracturing bridge plug for preventing stuck drill bit according to claim 1, characterized in that, The surface of the central rod (1) that cooperates with the anchoring part is provided with multiple sets of mating grooves (120), and a ratchet rack (12) is installed in the mating groove (120), with the ratchet teeth on the ratchet rack (12) pointing downwards towards the central rubber cylinder (5).

6. A drillable fracturing bridge plug for preventing stuck drill bit according to claim 1, characterized in that, The central rubber cylinder (5) is also provided with pressure-bearing rings (50) on both sides. The pressure-bearing rings (50) include a first combination ring (500) and a second combination ring (501) that are interlocked with each other. The inner rings of the first combination ring (500) and the second combination ring (501) are evenly provided with multiple insertion grooves (502). A matching ball (503) is elastically inserted into the insertion groove (502). The central rod (1) is provided with multiple sets of positioning grooves (13). After the central rubber cylinder (5) is compressed, the pressure-bearing rings (50) carrying the matching ball (503) cooperate with the positioning grooves (13) to protect and bear pressure on the central rubber cylinder (5).

7. A drillable fracturing bridge plug for preventing stuck drill bit according to claim 6, characterized in that, A side rubber sleeve (51) and a side pressure cone (52) are sleeved on the central rod (1) between the connecting plate (53) and the pressure ring (50). A sleeve (520) is provided on the side of the side pressure cone (52) facing the connecting plate (53). The end of the sleeve (520) abuts against the surface of the connecting plate (53). The long rod (61) passes through the pressure ring (50) and the side pressure cone (52) in sequence and is then connected to the short rod (60).

8. A drillable fracturing bridge plug for preventing stuck drill bit according to claim 1, characterized in that, The upper slip (3) and the lower slip (8) are evenly provided with multiple sets of spacer grooves (31). The outer ring of the upper cone (4) is provided with an upper mating plate (40) corresponding to the spacer groove (31) of the upper slip (3). The outer ring of the lower cone (7) is provided with a lower mating plate (70) corresponding to the spacer groove (8). The lower mating plate (70) and the spacer groove (31) are provided with shear flanges (71) on both sides of the mating part.

9. A drillable fracturing bridge plug for preventing stuck drill bit according to claim 1, characterized in that, The connecting tray (14) is provided with multiple sets of connecting bolts (140), which cooperate with the base (9). The center rod (1) is provided with multiple sets of mating protrusions (11) around the part of the drawing groove (100). The bottom of the connecting tray (14) is provided with a mating hole (141), and the inner ring of the mating hole (141) is provided with a mating groove (142) corresponding to the mating protrusion (11).

10. A drillable fracturing bridge plug for preventing stuck drill bit according to claim 1, characterized in that, The upper cone (4) and the lower cone (7) are provided with anti-jamming protrusions on the side facing the connecting plate (53), and the connecting plate (53) is provided with anti-jamming grooves accordingly.

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