Single-slip fully-soluble bridge plug

Abstract

The utility model relates to the technical field of oil and gas exploitation tools, and discloses a single-slip fully-soluble bridge plug which comprises a central pipe and a slip assembly, the slip assembly is formed by annularly arranging and combining a plurality of groups of single clamping blocks, fragment clamping teeth are installed on the top of each group of single clamping blocks through grooves, and the fragment clamping teeth are connected with the central pipe. Locking structures are symmetrically arranged at the two ends of the top of the slip assembly. The slip assembly and the locking structure are arranged, in the setting process, when the slip assembly is stressed to be opened, the locking structure is pulled, so that the sliding strip is stressed to slide and extend outwards along the sliding groove, and when the sliding strip slides and extends to the limit position, the tooth groove in the bottom of the sliding groove is locked through the teeth, and then the expansion opening limit of the slip assembly is controlled; the fragment clamping teeth can be embedded into the inner wall of a shaft sleeve, the effect of anchoring the bridge plug is achieved, the bridge plug is prevented from moving or sliding in a shaft, and the axial positioning and stability of the bridge plug are guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas extraction tools, specifically a single-slip fully soluble bridge plug. Background Technology

[0002] A single-slip soluble bridge plug is a downhole tool used in oil and gas exploration and development. Compared with a double-slip bridge plug, a single-slip soluble bridge plug has a simpler structure, shorter overall length, and smaller volume, making it easier to run and operate inside the wellbore. It is suitable for oil, gas, and water wells with various casing inner diameters and can be used in different types of wellbores, such as vertical wells and directional wells.

[0003] In the use of existing single-slip soluble bridge plugs, the slips expand due to pressure. The outer surface of the slips is anchored to the inner wall of the wellbore using wear-resistant materials. This anchoring method can easily accelerate the wear and dissolution of the slips. In addition, the slips lack a protective structure, which often causes the slips to over-expand due to excessive force, affecting the setting effect.

[0004] Therefore, there is a need for a single-slip fully soluble bridge plug that can protect the stability of the slip during downhole operations through a locking structure, thereby improving the practicality of the soluble bridge plug. Utility Model Content

[0005] To address the technical problem that existing single-slip soluble bridge plugs expand under pressure during use, and the outer surface of the slip is anchored to the inner wall of the wellbore using a wear-resistant material, this anchoring method easily accelerates the wear and dissolution of the slip. Furthermore, the slip lacks a protective structure, causing it to over-expand due to excessive force, thus affecting the setting effect, this utility model provides a single-slip fully soluble bridge plug.

[0006] This utility model is achieved using the following technical solution: a single-slip fully soluble bridge plug, comprising a central tube and a slip assembly, wherein the slip assembly is composed of multiple sets of single-slip blocks arranged in a ring, and each set of single-slip blocks has a fragment clamping tooth installed on its top through a groove. The top two ends of the slip assembly are symmetrically provided with locking structures, the locking structures including sliding grooves, sliding strips and fixing strips, used to cooperate with the expansion of the slip assembly, and the two sets of sliding grooves are symmetrically opened at the top two ends of the slip assembly.

[0007] Preferably, the multiple sets of fixing strips are located at equal intervals in a ring inside the sliding groove, and the fixing strips are correspondingly located on each set of single blocks. The multiple sets of sliding strips and fixing strips are arranged in pairs at intervals inside the sliding groove.

[0008] Preferably, a rubber tube is provided at one end of the central tube, two sets of back rings are connected to both ends of the rubber tube, and a spacer ring is provided in the middle of the rubber tube.

[0009] Preferably, one group of the back rings is connected with the central pipe, and the other group of the back rings is provided with a cone integrally arranged at one end of the back ring, and the end of the cone connected with the back ring is in a cylindrical shape.

[0010] Preferably, the end of the cone connected with the slip assembly is in a conical shape, and the outer periphery of the conical shape is formed by a plurality of annularly connected fan-shaped surfaces.

[0011] Preferably, a shoe is arranged at the end of the slip assembly away from the cone, and the end of the central pipe is provided with a soluble fracturing ball.

[0012] Compared with the prior art, the utility model has the beneficial effects that:

[0013] The utility model is provided with the slip assembly and the locking structure, in the setting process, the cone moves under the action of external force, the small diameter end of the cone extends into the slip assembly and pries it open, when the slip assembly is pried open under the action of force, the locking structure is dragged, the sliding strip is forced to slide outward along the sliding groove and extend, when the sliding extension reaches the limit position, the teeth lock the alveolar groove at the bottom of the sliding groove, and then the expansion and prying limit of the slip assembly is controlled, the slip assembly is prevented from being damaged due to excessive expansion and prying under pressure, and the broken piece slipper can be made of wear-resistant materials such as ceramic particles embedded on the outer surface, the broken piece slipper on the surface of the slip assembly expanded and pried open can be embedded into the inner wall of the wellbore casing, the broken piece slipper plays the role of anchoring the bridge plug, the bridge plug is prevented from moving or sliding in the wellbore, and the axial positioning and stability of the bridge plug are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 A three-dimensional structure schematic view of the soluble bridge plug provided by the utility model is shown in the figure;

[0015] Figure 2 A three-dimensional structure schematic view of the soluble bridge plug provided by the utility model is shown in the figure; Figure 1 A three-dimensional structure schematic view of the soluble bridge plug provided by the utility model is shown in the figure;

[0016] Figure 3 A three-dimensional structure schematic view of the soluble bridge plug provided by the utility model is shown in the figure;

[0017] Figure 4 A three-dimensional structure schematic view of the soluble bridge plug provided by the utility model is shown in the figure.

[0018] In the figure: 1, central pipe; 2, slip assembly; 3, broken piece slipper; 4, locking structure; 401, sliding groove; 402, sliding strip; 403, fixed strip; 5, rubber cylinder; 6, spacer ring; 7, back ring; 8, cone; 9, shoe; 10, soluble fracturing ball. DETAILED DESCRIPTION

[0019] In the following, the utility model is further described in combination with the drawings and the specific implementation, and it should be noted that the following described embodiments or technical features can be combined to form new embodiments without conflict.

[0020] Referring to Figure 1 - Figure 4 The single-grip fully-dissolvable bridge plug of the embodiment comprises a center pipe 1 and a slip assembly 2. One end of the center pipe 1 is provided with a rubber sleeve 5, and the other end of the center pipe 1 is provided with a dissolvable fracturing ball 10. The rubber sleeve 5 is provided with two sets of back rings 7 at both ends.

[0021] Specifically, the center pipe 1 is an axially hollow structure, the front end of which is provided with a connector and a plurality of uniformly distributed shear pins, and the inner front end of which is provided with a variable-diameter cavity for placing the dissolvable fracturing ball 10. The rubber sleeve 5 is arranged outside the center pipe 1 and can be made of elastic materials such as rubber. The rubber sleeve 5 is provided with a spacer ring 6 in the middle. During the bridge plug setting process, the rubber sleeve 5 is elastically deformed under extrusion. The spacer ring 6 makes the deformation of the rubber sleeve 5 more uniform, avoiding local excessive deformation of the rubber sleeve 5.

[0022] Further, one set of back rings 7 is connected to the center pipe 1, and the other set of back rings 7 is provided at one end with a conical body 8 integrally formed. The end of the conical body 8 connected to the back ring 7 is cylindrical, and the end of the conical body 8 connected to the slip assembly 2 is conical. The outer periphery of the conical shape is composed of multiple groups of annularly connected sectors. The slip assembly 2 is provided at the end away from the conical body 8 with a leading shoe 9.

[0023] Specifically, the back rings 7 are located at the front and rear ends of the rubber sleeve 5 and can be made of rubber or other materials with certain elasticity and wear resistance. When the bridge plug bears pressure, the back rings 7 can protect the rubber sleeve 5 from excessive deformation or damage under high pressure. The conical body 8 is located between the slip assembly 2 and the center pipe 1. During the setting process, the conical body 8 moves under external force, with its small-diameter end extending into the slip assembly 2 and expanding it. The leading shoe 9 plays a guiding and centralizing role during the bridge plug lowering process, enabling the bridge plug to be smoothly lowered into the wellbore and reach the predetermined position.

[0024] Further, the slip assembly 2 is composed of multiple groups of single gripping blocks arranged in a ring. The top of each group of single gripping blocks is provided with a broken piece gripping dog 3 through a groove. The top of the slip assembly 2 is symmetrically provided at both ends with a locking structure 4, which comprises a sliding groove 401, a sliding bar 402 and a fixed bar 403, for cooperating with the expansion of the slip assembly 2. Two sets of sliding grooves 401 are symmetrically provided at both ends of the top of the slip assembly 2. Multiple groups of fixed bars 403 are annularly and equally arranged inside the sliding grooves 401, and the fixed bars 403 are correspondingly arranged on each group of single gripping blocks. Multiple groups of sliding bars 402 and fixed bars 403 are arranged inside the sliding grooves 401 in pairs.

[0025] Specifically, during the setting process, the cone 8 is moved under the action of external force, the small-diameter end of the cone 8 extends into the slip assembly 2 and pries it open, the locking structure 4 is pulled when the slip assembly 2 is pried open, the sliding bar 402 is forced to slide outward along the sliding groove 401, the sliding bar 402 is locked in the tooth groove at the bottom of the sliding groove 4 when it slides to the limit position, and the expansion and prying limit of the slip assembly 2 is controlled, so that the slip assembly 2 is prevented from being damaged due to excessive expansion and prying under pressure, and the broken slips 3 can be made of wear-resistant materials such as ceramic particles embedded on the outer surface, the broken slips 3 on the surface of the expanded and pried slip assembly 2 are embedded into the inner wall of the wellbore casing, and the broken slips 3 play the role of anchoring the bridge plug, prevent the bridge plug from moving or sliding in the wellbore, and ensure the axial positioning and stability of the bridge plug.

[0026] The above-mentioned embodiments are only preferred embodiments of the present application, and cannot be used to limit the scope of protection of the present application. Any non-essential changes and replacements made by those skilled in the art on the basis of the present application shall fall within the scope of protection of the present application.

Claims

1. A single slip full soluble bridge plug comprising a central pipe (1) and a slip assembly (2), characterized in that, The slip assembly (2) is composed of multiple groups of single slip blocks arranged in a ring shape, the top of each group of single slip blocks is provided with a broken chip slip (3) through a groove, the top of the slip assembly (2) is symmetrically provided with a locking structure (4) at both ends, the locking structure (4) comprises a sliding groove (401), a sliding bar (402) and a fixed bar (403), which are used for cooperation with the expansion of the slip assembly (2), and two groups of sliding grooves (401) are symmetrically arranged at both ends of the top of the slip assembly (2).

2. A single slip full soluble bridge plug according to claim 1, wherein, Multiple groups of the fixed bars (403) are arranged in a ring shape at equal intervals in the interior of the sliding groove (401), and the fixed bars (403) are correspondingly arranged on each group of single slip blocks, and multiple groups of the sliding bars (402) and the fixed bars (403) are arranged in pairs at intervals in the interior of the sliding groove (401).

3. A single slip full soluble bridge plug according to claim 1, wherein, One end of the central pipe (1) is provided with a rubber cylinder (5), both ends of the rubber cylinder (5) are connected with two groups of back rings (7), and the middle of the rubber cylinder (5) is provided with a spacer ring (6).

4. A single slip full soluble bridge plug according to claim 3, wherein, One group of the back rings (7) is connected with the central pipe (1), and the other group of the back rings (7) is provided with a cone (8) integrally formed at one end, and the end connected with the back ring (7) of the cone (8) is in a cylindrical shape.

5. A single slip full soluble bridge plug according to claim 4, wherein, The end connected with the slip assembly (2) of the cone (8) is in a conical shape, and the outer periphery of the conical shape is composed of multiple groups of annularly connected fan surfaces.

6. A single slip full soluble bridge plug as defined in claim 1 wherein, The end away from the cone (8) of the slip assembly (2) is provided with a guide shoe (9), and the end of the central pipe (1) is provided with a dissolvable fracturing ball (10).

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