A type of slip for bridge plugs

Abstract

This application relates to the field of oil and gas drilling and fracturing technology, and in particular to a slip for a bridge plug. This application discloses a slip for a bridge plug. The slip is a spiral slip formed from a strip-shaped substrate, and its outer surface has an anchoring structure for anchoring the bridge plug. Because the slip of this application is a spiral slip, its expansion is within a 360-degree circumferential range. In this case, even if the casing deforms or is not round, the slip can achieve maximum embedding and anchoring of the casing wall within the circumferential range. Therefore, even when the casing deforms or is not round, the bridge plug can be anchored stably in the casing to the maximum extent, thus solving the technical problem in the prior art where the slip for the bridge plug cannot achieve stable anchoring of the bridge plug in a deformed casing.

Description

Technical Field

[0001] This application relates to the field of oil and gas drilling and fracturing technology, and in particular to a slip for a bridge plug. Background Technology

[0002] Bridge plugs play a crucial role in sealing oil and gas wells during drilling operations. They are characterized by fewer construction steps, precise sealing positioning, and large-scale fracturing capabilities. In the petroleum industry, bridge plugs are commonly used to achieve processes such as sealing between layers. Specifically, the bridge plug is anchored to a predetermined position on the casing wall using slips to prevent axial movement.

[0003] Specifically, the bridge plug's slip is fitted onto the outside of the cone, with its rear end abutting against the lower connector. When anchoring is required, the lower connector is pulled forward by a pull rod, thereby compressing the slip forward. This causes the cone, into which the slip is inserted, to radially expand the slip, thus embedding the anchoring structure on the outer surface of the slip into the tube wall of the sleeve, achieving bridge plug anchoring.

[0004] Currently, bridge plugs typically employ multiple longitudinally extending cuts made along the circumference of one side of the cone, forming multiple slip pieces. Supported by the cone, the slip pieces fitted onto one side of the cone are radially expanded, thus anchoring the bridge plug.

[0005] Bridge plugs using this type of slip require the casing to be in a normal cross-sectional shape to achieve stable anchoring. If the casing is deformed, or if the casing is not round (i.e., if casing deformation occurs), some slips will not be able to anchor stably to the casing, thus preventing the bridge plug from being stably anchored in the casing.

[0006] There is currently no effective solution to the technical problem that the slips of the bridge plug cannot stably anchor the bridge plug in the bushing where the bushing changes. Utility Model Content

[0007] This invention provides a slip for a bridge plug, which at least solves the technical problem in the prior art that the slip for a bridge plug cannot stably anchor the bridge plug in a casing where sleeve deformation occurs.

[0008] According to one aspect of this application, a slip for a bridge plug is provided. The slip is a spiral slip formed spirally from a strip-shaped substrate, and the outer surface of the slip has an anchoring structure for anchoring the bridge plug.

[0009] Optionally, the rear end face of the slip is used to abut against the front end face of the lower connector of the bridge plug, and the front part of the slip is used to fit onto the outside of the cone of the bridge plug, and the inner side of the slip is formed with a second cone surface that matches the first cone surface of the cone.

[0010] Alternatively, the clasp is a single-helix clasp formed by spiraling a single strip substrate.

[0011] Optionally, the clasp comprises a plurality of spiral strip substrates, wherein the plurality of strip substrates interlock to form the clasp.

[0012] Optionally, the anchoring structure consists of a plurality of first teeth distributed along the axial direction of the slip, wherein the first teeth are annular teeth extending circumferentially on the outer surface of the slip, wherein the tooth profile height of the first teeth is 0.8~0.9mm, the tooth profile half angle of the corresponding first rear side is 18°~23°, the tooth profile half angle of the corresponding front side is 65°~75°, and wherein the pitch between the first teeth is 3~4mm.

[0013] Alternatively, the anchoring structure is a ceramic nail fixed to the outer surface of the cladding.

[0014] Optionally, the front end face of the lower connector has a first tilt angle, and the rear end face of the slip has a second tilt angle that matches the first tilt angle.

[0015] Optionally, the rear end face of the cam is provided with a second guide groove adapted to the first boss of the lower connector and a second boss adapted to the first guide groove of the lower connector.

[0016] Optionally, at least a portion of the inner surface of the clapper is provided with a plurality of second teeth for anchoring the cone, wherein the second rear side of the second tooth has a tooth profile half angle of 45°, a tooth profile height of 0.8~0.9 mm, and a pitch of 1 mm.

[0017] Optionally, the strip substrate is made of magnesium alloy material.

[0018] Because the slip in this embodiment is a spiral slip, its expansion is within a 360-degree circumferential range. In this case, even if the casing deforms or becomes out of round, the slip can still achieve maximum embedding and anchoring within the casing wall within the 360-degree circumferential range. Therefore, even when the casing deforms or becomes out of round, the bridge plug can be anchored stably within the casing to the maximum extent. This solves the technical problem in the prior art where the slip of the bridge plug cannot achieve stable anchoring of the bridge plug within a deformed casing.

[0019] The above and other objects, advantages and features of this application will become more apparent to those skilled in the art from the following detailed description of specific embodiments of this application in conjunction with the accompanying drawings. Attached Figure Description

[0020] The following sections will describe some specific embodiments of this application in detail by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings: Figure 1 This is a schematic cross-sectional view of the bridge plug using the kava according to the embodiments of this application; Figure 2 yes Figure 1 A schematic diagram of the bridge plug's slip; Figure 3 yes Figure 2 The cross-sectional view of the shown card; Figure 4A and Figure 4B yes Figure 3 A magnified view of a section of the Kava shown; Figure 5 yes Figure 2 The cross-sectional view of the kava shown; Figure 6 This is a schematic cross-sectional view of a bridge plug using another type of slip according to an embodiment of this application; Figure 7A yes Figure 6 A schematic diagram of the bridge plug's slip; and Figure 7B It is Figure 7A The diagram shows a spiral-shaped strip substrate disassembled from a Kawa.

[0021] Explanation of reference numerals in the attached figures: 100. Bridge plug; 110. Lower connector; 111. Front end face; 111a. First boss; 111b. First guide groove; 120. Slip; 121. Rear end face; 121a. Second boss; 121b. Second guide groove; 122. Second conical surface; 123. First tooth; 123a. First rear side surface; 123b. Front side surface; 124. Second tooth; 124a. Second rear side surface; 130. Cone; 131. First conical surface; 140. Push ring; 150. Rubber sleeve; 160. Pull rod; 170. Locating nut. Detailed Implementation

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other. This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] To enable those skilled in the art to better understand the present disclosure, the technical solutions of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present disclosure, and not all embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present disclosure.

[0024] Figure 1 This is a cross-sectional view of a bridge plug 100 of a kava 120 according to an embodiment of this application. Figures 2 to 5 The relevant shape and structure of the slip 120 of the bridge plug 100 are shown. Figure 6 This is a cross-sectional view of the bridge plug 100 of another KAVO 120 according to an embodiment of this application, and Figure 7A and Figure 7B The relevant shape and structure of the slip 120 of the bridge plug 100 are shown.

[0025] Specifically, refer to Figure 1 or Figure 6 As shown, the bridge plug 100 using the slip 120 described in this embodiment includes a lower connector 110, a slip 120, and a cone 130 arranged in sequence.

[0026] refer to Figure 2 or Figure 7A As shown, this embodiment provides a slip 120 for a bridge plug, wherein the slip 120 is a spiral slip formed by a single strip substrate or by a spiral of multiple strip substrates, and the outer surface of the slip 120 is formed with an anchoring structure for anchoring the bridge plug 100.

[0027] Therefore, since the slip 120 in this embodiment adopts a spiral slip form, the slip 120 maintains a certain degree of elasticity in the radial direction. During anchoring, the lower connector 110 pushes the slip 120 to move towards the cone 130 (i.e., forward), so that the first cone surface 131 of the cone 130 forms a radial support force on the second cone surface 122 of the slip 120, thereby supporting the slip 120 to expand radially.

[0028] As described in the background section, current bridge plug slips typically employ multiple longitudinally extending cuts made along the circumference of one side of a cone, forming multiple slip pieces. Supported by the cone, the slip pieces on one side of the cone are radially expanded, thus anchoring the bridge plug. Bridge plugs using this type of slip require the casing's cross-sectional shape to achieve stable anchoring. If the casing deforms, or if the casing is not round (i.e., if casing deformation occurs), some slip pieces will not be stably anchored to the casing, preventing the bridge plug from being stably anchored within the casing.

[0029] Therefore, the slip in this embodiment is a spiral slip, and its expansion is within a 360-degree circumferential range. In this case, even if the casing deforms or becomes out of round, the slip can still achieve maximum embedding and anchoring within the casing wall within the 360-degree circumferential range. Thus, even when the casing deforms or becomes out of round, the bridge plug can be anchored stably within the casing to the maximum extent. This solves the technical problem in the prior art where the slip of the bridge plug cannot stably anchor the bridge plug within a deformed casing.

[0030] Optionally, the rear end face 121 of the slip 120 is used to abut against the front end face 111 of the lower connector 110 of the bridge plug 100, and the front part of the slip 120 is used to fit on the outside of the cone 130 of the bridge plug 100, and the inner side of the slip 120 is formed with a second cone surface 122 that is adapted to the first cone surface 131 of the cone 130.

[0031] Optionally, refer to Figure 2 As shown, the 120 is a single-spiral clasp formed by spiraling a single strip substrate.

[0032] Optionally, refer to Figure 7A As shown, the clasp 120 comprises a plurality of spiral-shaped strip substrates, wherein the plurality of strip substrates are interlaced to form the clasp 120. Wherein, Figure 7B A further schematic diagram of the split strip substrate is shown. Although Figure 7A and Figure 7B The spiral slip 120 is shown to be formed by two interlaced strip substrates, but a larger number of strip substrates are also applicable to this invention. Thus, by employing multiple strip substrates, the slip 120 can exhibit optimized stretching elasticity in the radial direction, allowing the cone to support the slip with less resistance, thereby enabling better anchoring.

[0033] Optionally, refer to Figure 2 and Figure 3As shown, the anchoring structure consists of a plurality of first teeth 123 distributed along the axial direction of the slip 120, wherein the first teeth 123 are annular teeth extending circumferentially on the outer surface of the slip 120.

[0034] Further, refer to Figure 4A As shown, the tooth height of the first tooth 123 is 0.8~0.9mm, the tooth half angle of the corresponding first posterior surface 123a is 18°~23°, the tooth half angle of the anterior surface 123b is 65°~75°, and the pitch between the first teeth 123 is 3~4mm.

[0035] Therefore, by using the teeth as an anchoring structure, anchoring can be achieved within a 360-degree circumference. Thus, even if the casing is deformed or not round, the slips can still achieve maximum embedding and anchoring of the casing wall within a 360-degree circumference.

[0036] Optionally, refer to Figure 6 As shown, the anchoring structure is a ceramic nail 125 fixed to the outer surface of the clasp 120.

[0037] Optionally, refer to Figures 1 to 3 As shown, the front end face 111 of the lower connector 110 has a first tilt angle, and the rear end face 121 of the slip 120 has a second tilt angle that matches the first tilt angle. Thus, the slip 120 and the lower connector 110 abut against each other via the tilted surfaces. In this case, the rear end face 121 of the slip 120 can expand radially along the tilted surface, reducing the friction between the rear end face 121 and the front end face 111 of the lower connector when the slip 120 expands, thereby optimizing the anchoring effect of the slip 120.

[0038] Optionally, refer to Figures 1 to 3 As shown, the front end face 111 of the lower connector 110 is provided with a first boss 111a and a first guide groove 111b extending radially along the lower connector 110. Consequently, the rear end face 121 of the slip 120 is provided with a second guide groove 121b that mates with the first boss 111a and a second boss 121a that mates with the first guide groove 111b. Thus, in this way, rotation of the slip 120 in the circumferential direction is prevented.

[0039] Optionally, refer to Figure 3 and Figure 4B As shown, at least a portion of the inner surface of the KAVO 120 is provided with a plurality of second teeth 124 for anchoring the cone 130.

[0040] Further, refer to Figure 4B As shown, the second posterior surface 124a of the second tooth 124 has a tooth profile half angle of 45°, a tooth profile height of 0.8~0.9mm, and a pitch of 1mm.

[0041] Thus, when the cone 130 is inserted into the slip 120, the second tooth 124 of the slip 120 can anchor the cone 130, making the slip 120 and the cone 130 more firmly fixed together.

[0042] Optionally, the strip substrate is made of a magnesium alloy material, which allows it to dissolve in petroleum or natural gas.

[0043] Optionally, refer to Figure 1 or Figure 6 As shown, a push ring 124 and a rubber sleeve 150 are also deployed on the rear side of the slip 120, sleeved on the outside of the cone 130. The push ring 124 and rubber sleeve 150 can achieve a seal between the bridge plug 100 and the sleeve. Furthermore, a positioning nut 170 is also deployed on the rear side of the cone 130, sleeved on the pull rod 160. Therefore, when anchoring the bridge plug 100, the pull rod 160 pulls the lower connector 110 forward, causing the slip 120 to move towards the cone 130 via the lower connector 110, thereby allowing the cone 130 to open the slip 120.

[0044] Therefore, the slip in this embodiment is a spiral slip, and its expansion is within a 360-degree circumferential range. In this case, even if the casing deforms or becomes out of round, the slip can still achieve maximum embedding and anchoring within the casing wall within the 360-degree circumferential range. Thus, even when the casing deforms or becomes out of round, the bridge plug can be anchored stably within the casing to the maximum extent. This solves the technical problem in the prior art where the slip of the bridge plug cannot stably anchor the bridge plug within a deformed casing.

[0045] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A slip (120) for a bridge plug (100), characterized in that, The slip (120) is a spiral slip formed by spiraling a strip substrate, and The outer surface of the slip (120) is formed with an anchoring structure for anchoring the bridge plug (100).

2. The slip (120) for a bridge plug (100) according to claim 1, characterized in that, The rear end face (121) of the slip (120) is used to abut against the front end face (111) of the lower connector (110) of the bridge plug (100), and the front part of the slip (120) is used to fit on the outside of the cone (130) of the bridge plug (100), and the inner side of the slip (120) is formed with a second cone surface (122) that is adapted to the first cone surface (131) of the cone (130).

3. The slip (120) for a bridge plug (100) according to claim 1, characterized in that, The slip (120) is a single spiral slip formed by spiraling a single strip substrate.

4. The slip (120) for a bridge plug (100) according to claim 1, characterized in that, The clasp (120) comprises a plurality of spiral strip substrates, wherein the plurality of strip substrates interpenetrate with each other to form the clasp (120).

5. The slip (120) for a bridge plug (100) according to claim 1, characterized in that, The anchoring structure consists of a plurality of first teeth (123) distributed along the axial direction of the slip (120), wherein the first teeth (123) are annular teeth extending circumferentially on the outer surface of the slip (120), and wherein... The tooth height of the first tooth (123) is 0.8~0.9mm, the tooth half angle of the corresponding first posterior surface (123a) is 18°~23°, the tooth half angle of the anterior surface (123b) is 65°~75°, and the pitch between the first teeth (123) is 3~4mm.

6. The slip (120) for a bridge plug (100) according to claim 1, characterized in that, The anchoring structure is a ceramic nail (125) fixed to the outer surface of the clasp (120).

7. The slip (120) for a bridge plug (100) according to claim 2, characterized in that, The front end face (111) of the lower connector (110) has a first tilt angle, and the rear end face (121) of the slip (120) has a second tilt angle that matches the first tilt angle.

8. The slip (120) for a bridge plug (100) according to claim 2, characterized in that, The rear end face (121) of the clasp (120) is provided with a second guide groove (121b) adapted to the first boss (111a) of the lower connector (110) and a second boss (121a) adapted to the first guide groove (111b) of the lower connector (110).

9. The slip (120) for a bridge plug (100) according to claim 2, characterized in that, At least a portion of the inner surface of the chuck (120) is provided with a plurality of second teeth (124) for anchoring the cone (130), and wherein The second posterior surface (124a) of the second tooth (124) has a tooth profile half angle of 45°, a tooth profile height of 0.8~0.9mm, and a pitch of 1mm.

10. The slip (120) for a bridge plug (100) according to claim 1, characterized in that, The strip substrate is made of magnesium alloy.

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