Bridge plug
By adopting the spiral tiles, the bridge plug can still be stably anchored when the sleeve is deformed or not round, solving the problem of unstable anchoring of the bridge plug in the sleeve variable casing and realizing the stable fixation of the bridge plug in the sleeve.
Patent Information
- Application Number
- CN202510763785.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-09
- Publication Date
- 2025-07-29
AI Technical Summary
The tile of the existing bridge plug cannot achieve stable anchoring in the sleeve-changed sleeve, resulting in the bridge plug being unable to be stably fixed in the sleeve.
Using spiral-formed kashi, the expansion and expansion of the kashi are carried out in a circumference of 360 degrees to ensure that the sleeve can be embedded and anchored to the maximum extent when the sleeve is deformed or not rounded.
Even if the sleeve is deformed or not rounded, the bridge plug can still be stably anchored in the sleeve, solving the problem of unstable anchoring of the bridge plug in the sleeve-changing sleeve in the prior art.
Smart Images
Figure CN120384719A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of oil and gas drilling and fracturing, and particularly relates to a bridge plug. Background Art
[0002] The bridge plug plays a role in sealing layers of oil and gas wells during drilling operations. It has the characteristics of fewer construction procedures, accurate setting positions, and large fracturing scales. In the petroleum industry, bridge plugs are usually used to achieve operations such as isolating layers. Among them, the bridge plug is anchored at a predetermined position on the casing wall through slips to prevent axial movement of the bridge plug.
[0003] Specifically, the slips of the bridge plug are sleeved outside the cone, and the rear end thereof abuts against the lower joint. When anchoring is required, the lower joint is pulled forward by a pull rod, thereby squeezing the slips to move forward. Furthermore, the cone inserted into the slips radially expands the slips, so that the anchoring structure on the outer surface of the slips is embedded into the pipe wall of the casing, realizing the anchoring of the bridge plug.
[0004] Currently, most of the slips of the bridge plug are formed by cutting a plurality of longitudinally extending cutting slits along the circumferential direction on one side of the sleeve on the cone, thereby forming a plurality of slip pieces. Supported by the cone, the slip pieces on one side of the cone where the slips are sleeved are radially expanded, thereby realizing the anchoring of the bridge plug.
[0005] The bridge plug using such slips can achieve stable anchoring only when the cross-sectional shape of the casing is in a normal state. If the casing is deformed or the casing is not round (i.e., in the case of casing deformation), some of the slip pieces will not be able to stably anchor the casing, so that the bridge plug cannot be stably anchored in the casing.
[0006] Aiming at the technical problem that the slips of the bridge plug in the prior art cannot stably anchor the bridge plug in a deformed casing, no effective solution has been proposed yet. Summary of the Invention
[0007] The present disclosure provides a bridge plug to at least solve the technical problem that the slips of the bridge plug in the prior art cannot stably anchor the bridge plug in a deformed casing.
[0008] According to one aspect of the present application, a bridge plug is provided, which includes a lower joint, slips, and a cone arranged in sequence. The rear end face of the slips abuts against the front end face of the lower joint, the front part of the slips is sleeved outside the cone, and a second conical surface adapted to the first conical surface of the cone is formed on the inner side of the slips. Among them, the slips are spiral slips formed by a strip-shaped base material spirally, and an anchoring structure for anchoring the bridge plug is formed on the outer surface of the slips.
[0009] Since the slips used in the bridge plug of this embodiment are spiral slips, the expansion of the slips is a 360-degree circumferential expansion. In this case, even if the casing is deformed or not round, the slips can achieve the maximum degree of embedding and anchoring on the inner wall of the casing within the circumferential range. Thus, even when the casing is deformed or not round, the bridge plug can be stably anchored in the casing to the maximum extent. This solves the technical problem in the prior art that the slips of the bridge plug cannot stably anchor the bridge plug in the deformed casing.
[0010] From the following detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings, those skilled in the art will become more clear about the above and other objects, advantages and features of the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Some specific embodiments of the present application will be described in detail hereinafter with reference to the accompanying drawings in an exemplary but non-limiting manner. The same reference numerals in the drawings denote the same or similar components or parts. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:
[0012] Figure 1 is a schematic cross-sectional view of a bridge plug according to an embodiment of the present application;
[0013] Figure 2 is Figure 1 a schematic view of the slips of the bridge plug shown;
[0014] Figure 3 is Figure 2 a cross-sectional view of the slips shown;
[0015] Figure 4A and Figure 4B is Figure 3 a partial enlarged view of the slips shown;
[0016] Figure 5 is Figure 2 a schematic view of the rear end face of the slips shown;
[0017] Figure 6 is a schematic cross-sectional view of another bridge plug according to an embodiment of the present application;
[0018] Figure 7A is Figure 6 a schematic view of the slips of the bridge plug shown; and
[0019] Figure 7B is Figure 7A a schematic view of the spiral strip-shaped substrate disassembled from the slips shown. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0020] It should be noted that, without conflict, the embodiments in the present disclosure and the features in the embodiments may be combined with each other. The following will describe the present disclosure in detail with reference to the drawings and in conjunction with the embodiments.
[0021] In order to enable those skilled in the art to better understand the solutions of the present disclosure, the following will clearly and completely describe the technical solutions in the embodiments of the present disclosure with reference to the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present disclosure.
[0022] It should be noted that the terms "first", "second", etc. in the specification and claims of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances so as to describe the embodiments of the present disclosure here. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to those clearly listed steps or units, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.
[0023] It should be noted that the terms used here are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used here, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "include" and / or "comprise" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.
[0024] Figure 1 is a cross-sectional view of a bridge plug 100 according to an embodiment of the present application. Figures 2 to 4B shows the relevant shape structure of the slips 120 of the bridge plug 100. Figure 6 is another cross-sectional view of a bridge plug 100 according to an embodiment of the present application, and and shows the relevant shape structure of the slips 120 of the bridge plug 100.
[0025] Specifically, referring to or As shown, an embodiment of the present application provides a bridge plug 100, including a lower sub 110, a slip 120, and a cone 130 arranged in sequence. The rear end face 121 of the slip 120 abuts against the front end face 111 of the lower sub 110. The front part of the slip 120 is sleeved outside the cone 130, and a second conical surface 122 adapted to the first conical surface 131 of the cone 130 is formed inside the slip 120. Among them, referring to or As shown, the slip 120 is a spiral slip formed by a strip-shaped base material 120a or by spirally winding strip-shaped base materials 120b and 120c, and an anchoring structure for anchoring the bridge plug 100 is formed on the outer surface of the slip 120.
[0026] Thus, since the slip 120 in this embodiment is in the form of a spiral slip formed by spiral winding, the slip 120 has a certain expansion and contraction elasticity in the radial direction. During anchoring, the lower sub 110 pushes the slip 120 to move towards the cone 130 (i.e., move forward), so that the first conical surface 131 of the cone 130 forms a radial supporting force on the second conical surface 122 of the slip 120, and further supports the slip 120 to expand radially.
[0027] As described in the background art, currently, the slips of bridge plugs mostly adopt cutting a plurality of longitudinally extending cutting slits along the circumferential direction on one side sleeved on the cone, so as to form a plurality of slip pieces. Supported by the cone, the slip pieces on one side of the slip sleeved on the cone are radially expanded, so as to realize the anchoring of the bridge plug. The bridge plug using such a slip can achieve stable anchoring only when the cross-sectional shape of the casing is in a normal state. If the casing is deformed or the casing is not round (i.e., in the case of casing deformation), some slip pieces will not be able to stably anchor the casing, so that the bridge plug cannot be stably anchored in the casing.
[0028] In view of this, the slip of the bridge plug in this embodiment is a spiral slip, so the expansion of the slip is an expansion within the range of 360 degrees along the circumference. In this case, even if the casing is deformed or the casing is not round, the slip can also achieve the maximum degree of embedding and anchoring on the pipe wall of the casing within the range of the circumference. Thus, even in the case of casing deformation or the casing not being round, the bridge plug can be stably anchored in the casing to the maximum extent. Thus, the technical problem that the slip of the bridge plug in the prior art cannot stably anchor the bridge plug in the deformed casing is solved.
[0029] Optionally, the strip-shaped base materials 120a, 120b, and 120c are made of magnesium alloy material. Thus, they can be dissolved in petroleum or natural gas.
[0030] Optionally, referring to As shown, the slip 120 is a single spiral slip formed by spirally forming a single strip-shaped substrate 120a.
[0031] Optionally, refer to As shown, the slip 120 includes a plurality of spiral strip substrates 120b, 120c, wherein the plurality of strip substrates 120b, 120c are interlaced with each other to form the slip 120. 7B further shows a schematic diagram of the strip substrate 120b after being split. and The spiral slips 120 are shown as being formed by two interlaced strip-shaped substrates 120b and 120c, but a greater number of strip-shaped substrates are also applicable to the present invention. Thus, by utilizing multiple strip-shaped substrates, the slips 120 can exhibit optimized elastic properties in the radial direction, allowing the cone to prop the slips apart with less resistance, thereby enabling better anchoring.
[0032] Optionally, refer to and As shown, the anchoring structure is a plurality of first teeth 123 distributed along the axial direction of the slip 120 , and wherein the first teeth 123 are annular teeth extending circumferentially on the outer surface of the slip 120 .
[0033] Further, refer to As shown, the tooth profile height of the first teeth 123 is 0.8-0.9 mm, the tooth profile half angle of the rear side 123a is 18°-23°, the tooth profile half angle of the front side 123b is 65°-75°, and the pitch between the first teeth 123 is 3-4 mm.
[0034] Therefore, the teeth serve as the anchoring structure, and the anchoring can be performed within the 360-degree range of the circumference. Therefore, even if the casing is deformed or out of round, the slips can achieve maximum embedment and anchoring in the casing wall within the 360-degree range of the circumference.
[0035] Optionally, refer to As shown, the anchoring structure is a ceramic pin 125 fixed to the outer surface of the slip 120.
[0036] Optionally, refer to As shown, the front end face 111 of the lower connector 110 has a first inclination angle, and the rear end face 121 of the slips 120 has a second inclination angle that matches the first inclination angle. Thus, the slips 120 and the lower connector 110 abut against each other via the inclined surface. In this case, the rear end face 121 of the slips 120 can expand radially along the inclined surface, reducing friction between the rear end face 121 and the front end face 111 of the lower connector during expansion and optimizing the anchoring effect of the slips 120.
[0037] Optionally, referring to and as shown, a first boss 111a and a first guiding groove 111b extending along the radial direction of the lower sub 110 are provided on the front end face 111 of the lower sub 110, and a second guiding groove 121b adapted to the first boss 111a and a second boss 121a adapted to the first guiding groove 111b are provided on the rear end face 121 of the slip 120. Thus, in this way, the slip 120 is prevented from rotating in the circumferential direction.
[0038] Optionally, referring to and as shown, at least a part of the inner surface of the slip 120 is provided with a plurality of second teeth 124 for anchoring the cone 130.
[0039] Furthermore, referring to as shown, the half angle of the tooth profile of the rear side face 124a of the second tooth 124 is 45°, the tooth profile height is 0.8 - 0.9 mm, and the pitch is 1 mm.
[0040] Thus, when the cone 130 is inserted into the slip 120, the second teeth 124 of the slip 120 can anchor the cone 130, so that the slip 120 and the cone 130 are fixed together more firmly.
[0041] Optionally, referring to or as shown, a push ring 140 and a rubber cylinder 150 sleeved on the outer side of the cone 130 are also arranged at the rear side of the slip 120. Thus, the seal between the bridge plug 100 and the casing can be achieved through the push ring 124 and the rubber cylinder 150.
[0042] Optionally, referring to or as shown, the bridge plug 100 further includes a pull rod 160 passing through the lower sub 110, the slip 120 and the cone 130, and a positioning nut 170 sleeved on the pull rod 160 is also arranged at the rear side of the cone 130. Thus, when anchoring the bridge plug 100, the lower sub 110 is pulled forward through the pull rod 160, so that the slip 120 is extruded by the lower sub 110 and moves towards the cone 130, and then the cone 130 can be used to expand the slip 120.
[0043] In light of this, the slips employed in this embodiment of the bridge plug are spiral slips, allowing them to expand and expand over a 360-degree circumference. In this manner, even if the casing is deformed or out of round, the slips can achieve maximum embedment and anchoring within the casing wall within a 360-degree circumference. Consequently, the bridge plug can be anchored in the casing with maximum stability, even in the event of deformation or out of roundness. This resolves the technical problem in prior art bridge plugs where slips cannot achieve stable anchoring of the bridge plug in deformed casings.
[0044] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values set forth in these embodiments do not limit the scope of the present disclosure. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed herein, any specific values should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.
[0045] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.
[0046] In the description of the present disclosure, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present disclosure and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present disclosure; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.
[0047] The above description is merely a preferred embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.
Claims
1. A bridge plug (100) includes a lower joint (110), a slip (120), and a cone (130) arranged in sequence. The rear end face (121) of the slip (120) abuts against the front end face (111) of the lower joint (110). The front part of the slip (120) is sleeved outside the cone (130), and a second conical surface (122) adapted to the first conical surface (131) of the cone (130) is formed inside the slip (120). It is characterized in that, the slip (120) is a spiral slip formed by spiraling a strip-shaped substrate, and an anchoring structure for anchoring the bridge plug (100) is formed on the outer surface of the slip (120).
2. The bridge plug (100) according to claim 1, characterized in that, The slip (120) is a single-spiral slip formed by spiraling a single strip-shaped substrate (120a).
3. The bridge plug (100) according to claim 1, wherein, The slip (120) includes a plurality of strip-shaped substrates (120b, 120c) in a spiral shape, and the plurality of strip-shaped substrates (120b, 120c) are interspersed with each other to form the slip (120).
4. The bridge plug (100) according to claim 1, characterized in that, The anchoring structure is a plurality of first teeth (123) distributed along the axial direction of the slip (120). Among them, the first teeth (123) are annular teeth extending along the circumference on the outer surface of the slip (120), and the tooth profile height of the first teeth (123) is 0.8 - 0.9 mm, the tooth profile half angle of the rear side face (123a) is 18° - 23°, the tooth profile half angle of the front side face (123b) is 65° - 75°, and the pitch between the first teeth (123) is 3 - 4 mm.
5. The bridge plug (100) according to claim 1, wherein, The anchoring structure is a ceramic nail (125) fixed on the outer surface of the slip (120).
6. The bridge plug (100) according to claim 1, characterized in that, The front end face (111) of the lower joint (110) has a first inclination angle, and the rear end face (121) of the slip (120) has a second inclination angle adapted to the first inclination angle.
7. The bridge plug (100) according to claim 1, characterized in that, The front end face (111) of the lower joint (110) is provided with a first boss (111a) and a first guiding groove (111b) extending along the radial direction of the lower joint (110), and the rear end face (121) of the slip (120) is provided with a second guiding groove (121b) adapted to the first boss (111a) and a second boss (121a) adapted to the first guiding groove (111b).
8. The bridge plug (100) according to claim 1, characterized in that, At least a part of the inner surface of the slip (120) is provided with a plurality of second teeth (124) for anchoring the cone (130).
9. The bridge plug (100) according to claim 8, characterized in that, The tooth profile half angle of the rear side face (124a) of the second teeth (124) is 45°, the tooth profile height is 0.8 - 0.9 mm, and the pitch is 1 mm.
10. The bridge plug (100) according to claim 1, wherein, The strip-shaped substrate is made of a magnesium alloy material, and a pushing ring (140) and a rubber cylinder (150) sleeved outside the cone (130) are further arranged at the rear side of the slip (120), and, It further includes a pull rod (160) disposed through the lower joint (110), the slip (120) and the cone (130), and wherein a positioning nut (170) sleeved on the pull rod (160) is further deployed at the rear side of the cone (130).