A soluble bridge plug that prevents falling off

Abstract

The present invention relates to the technical field of drilling and mining, and specifically to a soluble bridge plug that prevents falling off, wherein a sealing rubber cylinder can expand under pressure to tightly seal a wellbore. In order to enhance the stability of the bridge plug, there is a protective assembly on each side of the bridge plug. The locking assembly is another important part of the bridge plug, and they are located on both sides of the protective assembly. Each locking assembly includes a guide cone, a sliding rod, a slip ring and a push rod. The guide cone is arranged on one side of the protective assembly, the sliding rod is slidably arranged in the guide cone, the slip ring is slidably arranged on one side of the guide cone, the push rod is fixedly connected to the slip ring, and when the slip ring moves, the push rod has a pushing inclined surface, so that the sliding rod can be pushed out of the guide cone through the inclined surface of the push rod, so that it can contact the external hole wall, so that it can further cooperate with the slip ring to provide friction formed with the hole wall, so that the bridge plug can be better stabilized, thereby reducing the probability of falling off.

Description

Technical Field

[0001] The invention relates to the technical field of drilling and mining, and in particular to an anti-falling soluble bridge plug. Background Art

[0002] Soluble bridge plugs are a technological innovation in the field of oil drilling. They are mainly used to control water flow in oil and gas wells, especially during hydraulic fracturing operations. Unlike traditional permanent bridge plugs, this type of bridge plug can dissolve or disappear under certain conditions, thus providing a temporary plugging solution. In completion operations, soluble bridge plugs are particularly useful because they allow drilling companies to restore production at the wellhead by dissolving the bridge plug after fracturing is completed without the need for additional drilling operations, thereby improving the development efficiency and economic benefits of oil and gas fields. The design of this bridge plug material requires that it can remain stable under a specific temperature and pressure environment until a predetermined time or condition triggers its dissolution reaction, allowing the bridge plug to be effectively removed.

[0003] Due to the roughness and irregularity of the inner wall of the hole after drilling, and the possible formation of gaps in certain locations, the fixing effect of the bridge plug may be affected, which may cause the bridge plug to loosen or even fall off when it is subjected to subsequent pressure, thus causing safety problems. Summary of the invention

[0004] The purpose of the present invention is to provide a soluble bridge plug that prevents falling off, so as to enhance the anti-falling ability and improve the working quality.

[0005] To achieve the above-mentioned objectives, the present invention provides a soluble bridge plug that prevents falling off, including a center tube, a sealing ball, a sealing rubber tube, an end head, a pressure ring, two protection components and two locking components, the center tube having a first through hole and a second through hole, the first through hole being connected to the second through hole, the sealing ball being arranged in the first through hole, the sealing rubber tube being fixed in the center of the center tube, the two protection components being arranged on both sides of the sealing rubber tube, and the two locking components being arranged on both sides of the two protection components, the locking component including a guide cone, a sliding rod, a slip ring body and a push rod, the guide cone being arranged on one side of the protection component, the sliding rod being slidably arranged in the guide cone, the slip ring body being slidably arranged on one side of the guide cone, the push rod being fixedly connected to the slip ring body and being located on a side close to the sliding rod, the end head and the pressure ring being respectively arranged on the outsides of the two locking components, and the end head being fixed on the center tube, and the pressure ring being slidably arranged on the center tube.

[0006] Wherein, the sealing rubber cylinder comprises a plurality of ring bodies, a main rubber cylinder and two auxiliary rubber cylinders, the two auxiliary rubber cylinders are arranged on both sides of the main rubber cylinder, and the plurality of ring bodies are arranged on the main rubber cylinder.

[0007] Wherein, the pressure ring includes a pressure ring body and a locking pin, and the locking pin passes through the pressure ring body and is fixed on the central tube.

[0008] Among them, the protection component includes an extrusion ring, a limit plate, a spring and a limit ring, the extrusion ring is slidably arranged on one side of the auxiliary rubber cylinder, the limit plate is fixedly connected to the extrusion ring and slidably arranged on the center tube, the limit ring is fixed on one side of the limit plate, and the spring is arranged between the limit plate and the limit ring.

[0009] Wherein, the extrusion ring comprises an extrusion ring body and a plurality of deformation sheets, and the plurality of deformation sheets are fixed on the extrusion ring body and are located around the auxiliary rubber cylinder.

[0010] Wherein, the extrusion ring further comprises a plurality of limit rods, which are rotatably arranged on the extrusion ring body, and limit grooves and pressure blocks are arranged on the limit ring to match the limit rods.

[0011] Wherein, the locking assembly further comprises a cover ring, which is fixedly connected to the sealing ring and is located on the outside of the spring.

[0012] The present invention discloses a dissolvable bridge plug that prevents falling off. The bridge plug includes a central tube, which is a main supporting structure that passes through the wellbore and provides a passage for other components. The central tube is provided with two through holes, namely a first through hole and a second through hole. The two through holes are connected to allow fluid to flow between different parts of the bridge plug. The sealing ball is one of the key components of the bridge plug, which is arranged in the first through hole. The function of the sealing ball is to seal the channel when the bridge plug is activated to prevent the passage of fluid. The sealing rubber tube is fixed at the center of the central tube. It is a soft material that can expand under pressure to tightly seal the wellbore. In order to enhance the stability of the bridge plug, there is a protective assembly on each side of the bridge plug. They are located on both sides of the sealing rubber tube and play a protective role to prevent the sealing rubber tube from shifting due to pressure. The locking assembly is another important part of the bridge plug. They are located on both sides of the protective assembly. Each locking assembly includes a guide cone, a sliding rod, a slip ring and a push rod. The guide cone is arranged on one side of the protection component, the slide rod is slidably arranged in the guide cone, the slip ring is slidably arranged on one side of the guide cone, and the push rod is fixedly connected to the slip ring and is located on the side close to the slide rod. These components work together to ensure that the bridge plug is firmly locked underground. Specifically, when the slip ring moves, the push rod has a pushing inclined surface, so that the slide rod can be pushed out of the guide cone through the inclined surface of the push rod, so that it can contact the external hole wall, so that the slip ring can be further matched to provide friction formed with the hole wall, so that the bridge plug can be better stabilized, thereby reducing the probability of falling off. The end head and the pressure ring are respectively arranged on the outside of the two locking assemblies. The end head is fixed on the center pipe to limit the entire structure, and the pressure ring is slidably arranged on the center pipe, which can be used to push the slip ring to move for sealing. Through the above design, the bridge plug of the present application can enhance the anti-falling ability and make the work quality better. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 It is a structural diagram of an anti-falling soluble bridge plug according to the first embodiment of the present invention.

[0015] Figure 2 It is a cross-sectional structural diagram of an anti-falling soluble bridge plug according to the first embodiment of the present invention.

[0016] Figure 3 It is a structural diagram of an anti-falling soluble bridge plug according to the second embodiment of the present invention.

[0017] Figure 4 It is a cross-sectional structural diagram of an anti-falling soluble bridge plug according to the second embodiment of the present invention.

[0018] Figure 5 yes Figure 4 A partial enlargement of detail A.

[0019] Center tube 101, sealing ball 102, sealing rubber cylinder 103, end 104, pressure ring 105, protection assembly 106, locking assembly 107, first through hole 108, second through hole 109, guide cone 110, slide rod 111, slip ring body 112, push rod 113, ring body 201, main rubber cylinder 202, auxiliary rubber cylinder 203, pressure ring body 204, locking pin 205, extrusion ring 206, limit plate 207, spring 208, limit ring 209, extrusion ring body 210, deformation plate 211, limit rod 212, cover ring 215, tile 216, protrusion 217, locking ring 218, limit groove 219, pressure block 220. DETAILED DESCRIPTION

[0020] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0021] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, in the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0022] Soluble bridge plugs represent an innovation in oil drilling technology, which mainly acts on fluid control in oil and gas wells, especially in hydraulic fracturing operations. Unlike traditional permanent bridge plugs, soluble bridge plugs can be dissolved or disappear under specific conditions, thus providing a temporary plugging solution. In the completion process, soluble bridge plugs are very valuable because they enable drilling companies to restart production at the wellhead by dissolving the bridge plug after fracturing is completed without the need for additional drilling work, thus improving the development efficiency and economic benefits of oil and gas fields. The design of the bridge plug material needs to remain stable under the specific temperature and pressure conditions it is in until the preset time or conditions trigger its dissolution reaction, thereby achieving effective removal of the bridge plug.

[0023] However, due to the roughness and irregularity of the inner wall of the hole after drilling, as well as the possible existence of voids in certain locations, the fixing effect of the bridge plug may be affected. This effect may cause the bridge plug to loosen or fall off when subjected to subsequent pressure, thus posing a safety hazard. Therefore, these factors must be taken into account when designing and applying the bridge plug to ensure its stability and safety.

[0024] First embodiment

[0025] See also Figure 1-2 The present invention provides an anti-dropping soluble bridge plug, comprising a central tube 101, a sealing ball 102, a sealing rubber tube 103, an end 104, a pressure ring 105, two protection components 106 and two locking components 107. The central tube 101 has a first through hole 108 and a second through hole 109, the first through hole 108 is connected to the second through hole 109, the sealing ball 102 is arranged in the first through hole 108, the sealing rubber tube 103 is fixed at the center of the central tube 101, the two protection components 106 are arranged on both sides of the sealing rubber tube 103, the two locking components 107 are arranged on both sides of the two protection components 106, and the locking components 107 are arranged on both sides of the two protection components 106. The tightening assembly 107 includes a guide cone 110, a slide rod 111, a cava ring 112 and a push rod 113. The guide cone 110 is arranged on one side of the protection assembly 106. The slide rod 111 is slidably arranged in the guide cone 110. The cava ring 112 is slidably arranged on one side of the guide cone 110. The push rod 113 is fixedly connected to the cava ring 112 and is located on a side close to the slide rod 111. The end head 104 and the pressure ring 105 are respectively arranged on the outside of the two locking assemblies 107, and the end head 104 is fixed on the center pipe 101, and the pressure ring 105 is slidably arranged on the center pipe 101.

[0026] In this embodiment, the bridge plug includes a central tube 101, which is a main support structure that passes through the wellbore and provides passages for other components. The central tube 101 is provided with two through holes, namely a first through hole 108 and a second through hole 109. The two through holes are connected to allow fluid to flow between different parts of the bridge plug. The sealing ball 102 is one of the key components of the bridge plug, which is set in the first through hole 108. The function of the sealing ball 102 is to seal the channel when the bridge plug is activated to prevent fluid from passing through. The sealing rubber cylinder 103 is fixed at the center of the central tube 101. It is a soft material that can expand under pressure to tightly seal the wellbore. In order to enhance the stability of the bridge plug, there is a protective assembly 106 on each side of the bridge plug. They are located on both sides of the sealing rubber cylinder 103 to play a protective role and prevent the sealing rubber cylinder 103 from shifting due to pressure. The locking assembly 107 is another important part of the bridge plug. They are located on both sides of the protective assembly 106. Each locking assembly 107 includes a guide cone 110, a slide rod 111, a slip ring 112 and a push rod 113. The guide cone 110 is arranged on one side of the protection assembly 106, the slide rod 111 is slidably arranged in the guide cone 110, the slip ring 112 is slidably arranged on one side of the guide cone 110, and the push rod 113 is fixedly connected to the slip ring 112 and is located on the side close to the slide rod 111. These components work together to ensure that the bridge plug is firmly locked underground. Specifically, when the slip ring 112 moves, the push rod 113 has a push inclined surface, so that the slide rod 111 can be pushed out of the guide cone 110 through the inclined surface of the push rod 113, so that it can contact the external hole wall, so that the slip ring 112 can be further matched to provide friction formed with the hole wall, so that the bridge plug can be better stabilized, thereby reducing the probability of falling off. The end head 104 and the pressure ring 105 are respectively arranged on the outside of the two locking components 107. The end head 104 is fixed on the central tube 101 to limit the entire structure, and the pressure ring 105 is slidably arranged on the central tube 101, and can be used to push the slip ring body 112 to move for sealing. Through the above design, the bridge plug of the present application can enhance the anti-falling ability and make the working quality better.

[0027] Second embodiment

[0028] See also Figure 3 to Figure 5On the basis of the first embodiment, the present invention further provides a soluble bridge plug that prevents falling off, wherein the sealing rubber tube 103 comprises a plurality of ring bodies 201, a main rubber tube 202 and two auxiliary rubber tubes 203, wherein the two auxiliary rubber tubes 203 are arranged on both sides of the main rubber tube 202, and the plurality of ring bodies 201 are arranged on the main rubber tube 202. The design of the sealing rubber tube 103 is the key to the bridge plug being able to effectively seal the wellbore, and it comprises a plurality of ring bodies 201, a main rubber tube 202 and two auxiliary rubber tubes 203. The main rubber tube 202 is located in the center, and there is an auxiliary rubber tube 203 on each side, and these rubber tubes work together to provide a better sealing effect. The plurality of ring bodies 201 are arranged on the main rubber tube 202, which further enhances the structural strength of the sealing rubber tube 103.

[0029] The pressure ring 105 includes a pressure ring body 204 and a locking pin 205, and the locking pin 205 is fixed on the central tube 101 through the pressure ring body 204. In normal circumstances, no sealing effect is performed, and only when the push-pull force exceeds the strength of the locking pin 205, the pressure ring body 204 can be pushed to slide for sealing.

[0030] The protection assembly 106 includes an extrusion ring 206, a limiting piece 207, a spring 208 and a limiting ring 209. The extrusion ring 206 is slidably arranged on one side of the secondary rubber cylinder 203. The limiting piece 207 is fixedly connected to the extrusion ring 206 and slidably arranged on the central tube 101. The limiting ring 209 is fixed on one side of the limiting piece 207. The spring 208 is arranged between the limiting piece 207 and the limiting ring 209. The extrusion ring 206 can cooperate with the secondary rubber cylinder 203 to provide protection for the secondary rubber cylinder 203. At the same time, the limiting piece 207 can limit the sliding distance of the extrusion ring 206 to prevent excessive pressure from being transmitted to the secondary rubber cylinder 203 through the extrusion ring 206. The limiting ring 209 provides restoring force support to the limiting piece 207 through the spring 208.

[0031] The extrusion ring 206 includes an extrusion ring body 210 and a plurality of deformable sheets 211, which are fixed to the extrusion ring body 210 and are located around the auxiliary rubber cylinder 203. The plurality of deformable sheets 211 can be deformed according to the auxiliary rubber cylinder 203 to provide corresponding support for the auxiliary rubber cylinder 203.

[0032] The extrusion ring 206 further includes a plurality of limiting rods 212, which are rotatably arranged on the extrusion ring body 210, and a limiting groove 219 and a pressing block 220 are arranged on the limiting ring 209 to match the limiting rods 212. In order to better support the deformation sheet 211, a plurality of limiting rods 212 are further arranged on the extrusion ring body 210. When the deformation sheet 211 is deformed and rotated backward, the limiting sheet 207 slides backward and enters the limiting groove 219, and is then fixed by the pressing block 220, so that the limiting rods 212 can further provide support for the deformation sheet 211, so as to better protect the secondary rubber cylinder 203.

[0033] The locking assembly 107 further includes a cover ring 215, which is fixedly connected to the pressure block and is located outside the spring 208. The cover ring 215 can protect the location of the sealing spring 214, thereby preventing impurities from entering the location of the spring 208 and affecting the normal operation of the spring 208.

[0034] The slip ring 112 includes a plurality of tiles 216, a plurality of protrusions 217 and a locking ring 218. The locking ring 218 is slidably arranged on one side of the guide cone 110. The tiles 216 are connected to the locking ring 218 through a connecting block, and a plurality of protrusions 217 are arranged on the tiles 216. The locking ring 218 provides a supporting function, and then a plurality of protrusions 217 are arranged on the tiles 216 so that after being pushed by the guide cone 110, the tiles 216 can better contact with the external hole wall, so that the fixation is more stable.

[0035] The anti-drop-off soluble bridge plug of the present invention provides higher stability and sealing performance through its unique structural design. The design of multiple ring bodies 201 and auxiliary rubber tubes 203 enables the bridge plug to better adapt to the irregular inner wall of the wellbore and provide a better sealing effect. The design of the protection component 106 and the locking component 107 ensures the stability and safety of the bridge plug underground. The unique design of the extrusion ring 206 enables it to deform when under pressure, thereby enhancing the sealing effect. The design of the locking component 107 ensures that the bridge plug is firmly locked underground to prevent it from falling off.

[0036] What is disclosed above is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A soluble bridge plug that prevents falling off, characterized in that: The invention comprises a center tube, a sealing ball, a sealing rubber tube, an end head, a pressure ring, two protection components and two locking components, wherein the center tube has a first through hole and a second through hole, the first through hole is connected to the second through hole, the sealing ball is arranged in the first through hole, the sealing rubber tube is fixed in the center of the center tube, the two protection components are arranged on both sides of the sealing rubber tube, and the two locking components are arranged on both sides of the two protection components, the locking component comprises a guide cone, a sliding rod, a slip ring body and a push rod, the guide cone is arranged on one side of the protection component, the sliding rod is slidably arranged in the guide cone, the slip ring body is slidably arranged on one side of the guide cone, the push rod is fixedly connected to the slip ring body and is located on a side close to the sliding rod, the end head and the pressure ring are respectively arranged on the outsides of the two locking components, and the end head is fixed on the center tube, the pressure ring is slidably arranged on the center tube, the slip ring body comprises a plurality of tiles, a plurality of convex and a locking ring, wherein the locking ring is slidably arranged on one side of the guide cone, the tile is connected to the locking ring through a connecting block, and a plurality of the protrusions are arranged on the tile, the sealing rubber cylinder comprises a plurality of ring bodies, a main rubber cylinder and two auxiliary rubber cylinders, the two auxiliary rubber cylinders are arranged on both sides of the main rubber cylinder, and a plurality of the ring bodies are arranged on the main rubber cylinder, the protection component comprises an extrusion ring, a limiting piece, a spring and a limiting ring, the extrusion ring is slidably arranged on one side of the auxiliary rubber cylinder, the limiting piece is fixedly connected to the extrusion ring and slidably arranged on the center tube, the limiting ring is fixed on one side of the limiting piece, and the spring is arranged between the limiting piece and the limiting ring, the extrusion ring comprises an extrusion ring body and a plurality of deformation pieces, a plurality of the deformation pieces are fixed on the extrusion ring body and are located around the auxiliary rubber cylinder, the extrusion ring also comprises a plurality of limiting rods, a plurality of the limiting rods are rotatably arranged on the extrusion ring body, and a limiting groove and a pressing block are arranged on the limiting ring to match the limiting rod.

2. The anti-falling soluble bridge plug according to claim 1, characterized in that: The pressure ring comprises a pressure ring body and a locking pin, and the locking pin passes through the pressure ring body and is fixed on the central tube.

3. The anti-falling soluble bridge plug according to claim 2, characterized in that: The locking assembly also includes a cover ring, which is fixedly connected to the sealing ring and is located outside the spring.

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