Soluble bridge plug slip anchoring tooth press-fitting mechanism

Abstract

The utility model relates to the technical field of petroleum and natural gas drilling and fracturing downhole tools, in particular to a soluble bridge plug slip anchoring tooth press-fitting mechanism which comprises a connector, a tooth pressing rod and a press-fitting base, a connecting part is arranged on the upper portion of the connector and used for being connected with a press-fitting power source, a plurality of bottom threaded holes are formed in the bottom of the connector, and the bottom threaded holes are connected with the tooth pressing rod. The top of the tooth pressing rod is arranged in the bottom threaded hole and is in threaded connection with the bottom threaded hole; the press-fitting base is arranged vertically below the tooth pressing rod, and a positioning groove used for positioning the slip petals is formed in the upper surface of the press-fitting base. The slip anchoring device has the advantages that the press-fitting power source drives the tooth pressing rod to move downwards to apply pressure to the slip anchoring teeth, so that the press-fitting angle and the press-fitting depth of the slip anchoring teeth are consistent and constant, effective and uniform anchoring of a slip is guaranteed, the problems of unbalanced loading or uneven anchoring of the slip are effectively solved, and the slip anchoring quality is improved. And the pressure bearing capacity and the anchoring stability of the anchoring structure are improved.

Description

Technical Field

[0001] This utility model relates to the field of downhole tools for oil and gas drilling and fracturing, and in particular to a soluble bridge plug slip anchor tooth pressing mechanism. Background Technology

[0002] With the ongoing exploration and development of unconventional oil and gas fields in China, higher demands have been placed on the research and development of production enhancement technologies for unconventional reservoirs. Multi-stage fracturing technology combining perforation guns and bridge plugs is widely used in the development of unconventional oil and gas, tight oil and gas, and low-permeability oil and gas. Among these technologies, bridge plugs play a crucial role in effectively isolating the different stages of fracturing. Currently, the bridge plugs commonly used in the bridge-perforation combined fracturing process in China are mostly soluble bridge plugs. These bridge plugs are a new type of fracturing staged and segmented enhancement tool developed based on cast iron drillable bridge plugs and composite drillable bridge plugs. Their core working principle lies in the fact that the anchoring mechanism of the soluble bridge plug makes close contact with the inner wall of the casing, achieving anchoring and then pushing the upper sealing mechanism to deform, thus achieving wellbore sealing.

[0003] As a key component of the soluble bridge plug, the anchoring mechanism plays a decisive role in the successful setting of the bridge plug within the downhole casing. Its key components are the slips and the slip anchoring teeth. The anchoring mechanism must maintain stable anchoring between the soluble bridge plug and the casing in complex downhole environments, including irregular casing surfaces and corrosion, to meet production demands under challenging conditions. This places higher demands on the stability of the slip anchoring teeth.

[0004] In the existing technology, when installing the clip anchor teeth, the clip anchor teeth are usually pressed into the inlay hole of the clip flap with adhesive applied by manual means. Due to manual operation, not only is the operation inefficient, but the stability of the clip anchor teeth inlay cannot be guaranteed. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a soluble bridge plug slip anchoring tooth pressing mechanism, which can realize the rapid and accurate pressing of the soluble bridge plug slip anchoring tooth, and effectively improve the stability and reliability of the soluble bridge plug.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A soluble bridge plug slip anchoring tooth pressing mechanism includes a connector, a pressing tooth rod and a pressing base. The upper part of the connector is provided with a connecting part for connecting to a pressing power source. The bottom of the connector is provided with a plurality of bottom threaded holes. The top of the pressing tooth rod is located in the bottom threaded holes and is threadedly connected to the bottom threaded holes. The pressing base is located vertically below the pressing tooth rod. The upper surface of the pressing base is provided with a positioning groove for positioning the slip flap.

[0007] The beneficial effects of this utility model are: the structure of this utility model is simple and reliable, easy for operators to learn and use quickly. The clamping base supports the clamping jaws, so that the clamping jaws with the clamping teeth for accommodating the clamping teeth are set upward. Then, the clamping teeth are placed in the clamping teeth with the clamping power source. The clamping tooth rod is moved down to apply pressure to the clamping teeth, thereby ensuring that the clamping angle and clamping depth of the clamping teeth are consistent and constant. This ensures that the clamping jaws are effectively and evenly anchored, effectively avoiding problems such as clamping jaws being unbalanced or unevenly anchored, and improving the pressure-bearing capacity and anchoring stability of the anchoring structure.

[0008] Based on the above technical solution, the present invention can be further improved as follows.

[0009] Furthermore, the bottom of the pressure bar is provided with a ball head structure.

[0010] The beneficial effect of adopting the above-mentioned further solution is that the bottom of the pressure bar is provided with a ball head structure, which facilitates the automatic alignment of the locking tooth angle.

[0011] Furthermore, the ball head structure is made of copper, aluminum, plastic, or rubber.

[0012] The beneficial effect of adopting the above-mentioned further solution is that the ball head structure is made of copper, aluminum, plastic or rubber, which can prevent damage to the slip anchor teeth.

[0013] Furthermore, the ball head structure and the pressure bar are an integrated structure.

[0014] The beneficial effect of adopting the above-mentioned further solution is that the ball head structure and the pressure bar adopt an integrated structure, and the ball head structure and the pressure bar are manufactured as a whole, which can ensure the connection strength of the ball head structure and the pressure bar.

[0015] Furthermore, the ball head structure is fixedly connected to the pressure bar.

[0016] The beneficial effect of adopting the above-mentioned further solution is that the ball head structure and the pressure bar are separate structures, and then connected by a fixed connection method, such as by welding, which facilitates the manufacturing of ball head structures and pressure bars with different shapes.

[0017] Furthermore, the ball head structure is detachably and fixedly connected to the pressure bar.

[0018] The beneficial effects of adopting the above-mentioned further solution are: the ball head structure and the pressure bar can be detachably and fixedly connected, for example by a threaded connection, which makes it convenient to select different ball head structures for press-fitting according to the size of the clamp anchor teeth, thereby improving the adaptability of press-fitting.

[0019] Furthermore, the positioning groove includes at least a bottom support surface for supporting the valve flap and a rear support surface for limiting the rear end of the valve flap. The bottom support surface is gradually inclined downward from the end away from the rear support surface to the end closer to the rear support surface.

[0020] The beneficial effect of adopting the above-mentioned further solution is that the positioning groove is only used to support the bottom of the slip flap and limit the rear end of the slip flap, which can be used for pressing slip flaps of different sizes, greatly improving the versatility of this utility model.

[0021] Furthermore, the positioning groove includes a rear support surface for limiting the rear end of the valve flap, and side support surfaces for limiting the two sides of the valve flap respectively. The two side support surfaces are inclined surfaces that are far apart from each other from bottom to top.

[0022] The beneficial effect of adopting the above-mentioned further solution is that by limiting the rear end and both sides of the slip flap, the stability of the slip flap limitation is ensured, and the slip flap is tightly limited in the limiting groove, providing high stability for the slip anchoring tooth press-fitting operation.

[0023] Furthermore, the connecting part is a cylindrical structure disposed on the upper part of the connector, and the cylindrical structure is provided with external threads.

[0024] Furthermore, the connecting part is a sidewall connecting hole provided on the sidewall of the connector.

[0025] The advantage of adopting the above-mentioned further solution is that it facilitates the installation and connection of the connector and the press-fit power source. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the pressing process according to one embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the press-fitting process according to another embodiment of the present invention;

[0028] Figure 3 This is a front view of the installation of the slip flap and slip anchoring tooth in this utility model;

[0029] Figure 4 This is a side view showing the installation of the slip flap and slip anchoring tooth in this utility model;

[0030] Figure 5 This is a front view of the press-fit base in one embodiment of the present invention;

[0031] Figure 6 This is a front view of the press-fit base in another embodiment of the present invention;

[0032] Figure 7 This utility model Figure 6 Sectional view of plane AA;

[0033] The attached diagram lists the components represented by each number as follows:

[0034] 1. Connector; 2. Toothed rod; 3. Press-fit base; 4. Bottom threaded hole; 5. Positioning groove; 6. Ball head structure; 7. Bottom support surface; 8. Rear support surface; 9. Side support surface; 10. External thread; 11. Side wall connection hole; 12. Vase flap; 13. Vase anchoring tooth. Detailed Implementation

[0035] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0036] like Figure 1 , Figure 2 As shown, one embodiment of this utility model includes a connector 1, a pressure bar 2, and a pressing base 3. The upper part of the connector 1 is provided with a connecting part for connecting to a pressing power source. The bottom of the connector 1 is provided with a plurality of bottom threaded holes 4. The number of bottom threaded holes 4 can be one or more, and the specific number can be determined according to the number of slip anchoring teeth 13 to be installed on the slip flap 12. It can be one for pressing one slip anchoring tooth 13 alone, or multiple for pressing multiple slip anchoring teeth 13 at the same time to improve the pressing efficiency. The top of the pressure bar 2 is located in the bottom threaded hole 4 and is threadedly connected to the bottom threaded hole 4. The pressing base 3 is located vertically below the pressure bar 2, and the upper surface of the pressing base 3 is provided with a positioning groove 5 for positioning the slip flap 12.

[0037] like Figure 1 As shown, the connecting part is a cylindrical structure disposed on the upper part of the connector 1, and the cylindrical structure is provided with external threads 10.

[0038] like Figure 2 As shown, the connecting part can also be a sidewall connecting hole 11 provided on the sidewall of the connector 1.

[0039] In an embodiment of this utility model, the bottom of the pressure rod 2 is provided with a ball head structure 6, which facilitates the automatic alignment of the locking tooth 13. The ball head structure 6 is made of copper, aluminum, plastic, rubber, or other non-ferrous metals with low strength. The plastic or rubber is made of hard plastic or hard rubber to prevent damage to the locking tooth.

[0040] Specifically, the pressure rod 2 is a long rod. To facilitate threaded connection with the bottom threaded hole 4, the upper part of the pressure rod 2 is at least cylindrical to match the bottom threaded hole 4, and threads are provided on the cylinder. When multiple pressure rods 2 are installed below the connector 1 to press-fit multiple slip anchor teeth 13 at one time, different lengths of pressure rods 2 can be selected according to the height difference between each group of slip anchor teeth 13, or the threaded connection depth between each pressure rod 2 and the connector 1 can be adjusted to achieve the length of the pressure rod 2 extending out of the bottom threaded hole 4, thereby completing the efficient adaptation before pressing.

[0041] In the embodiments of this utility model, the press-fitting power source has wide adaptability and offers various power options, allowing operators to flexibly select the appropriate power source based on different pressing force requirements. Manual operation can be used for small-scale operations or scenarios requiring high precision, while a high-efficiency and fast pneumatic system can be selected for medium-scale production needs. Hydraulic power provides reliable support for demanding high-pressure conditions.

[0042] In embodiments of this utility model, the ball head structure 6 and the pressure rod 2 are an integrated structure, and the integrated manufacturing of the ball head structure 6 and the pressure rod 2 ensures the connection strength between the ball head structure 6 and the pressure rod 2. Alternatively, the ball head structure 6 and the pressure rod 2 can be separate structures, and then connected by a fixed connection method, such as welding, which facilitates the manufacturing of ball head structures 6 and pressure rod 2 with different shapes. Alternatively, the ball head structure 6 and the pressure rod 2 can be detachably fixedly connected, for example, by a threaded connection. Specifically, a threaded groove can be provided at the bottom end of the pressure rod 2, and a screw joint can be provided at the top of the ball head structure 6. The detachable fixed connection between the ball head structure 6 and the pressure rod 2 is achieved by connecting the threaded groove and the screw joint, which allows for the selection of different ball head structures 6 for press-fitting according to the size of the locking tooth 13, improving the adaptability of press-fitting. In addition, the ball head structure 6 and the pressure rod 2 can also be detachably fixedly connected by other detachable connection methods in the prior art, all of which are within the protection scope of this application.

[0043] like Figure 3 , Figure 4 As shown, in this field, the cross-section of the slip flap 12 is usually fan-shaped, and the arc at one end is longer than the arc at the other end, so that the two sides of the bottom of the slip flap 12 are inclined, and the slip anchoring tooth 13 is installed in the slip inlay hole on the upper surface of the slip flap 12.

[0044] To achieve the limiting of the aforementioned locking flap 12, this utility model provides two implementation methods for the press-fit base 3:

[0045] like Figure 5As shown, in one embodiment, the positioning groove 5 includes at least a bottom support surface 7 for supporting the vane 12 and a rear support surface 8 for limiting the rear end of the vane 12. The bottom support surface 7 is gradually inclined downward from the end away from the rear support surface 8 to the end closer to the rear support surface 8. The positioning groove 5 is only used to support the bottom of the vane 12 and limit the rear end of the vane 12, which can be used for pressing vanes 12 of different sizes, greatly improving the versatility of this utility model.

[0046] like Figure 6 , Figure 7 As shown, in another embodiment, the positioning groove 5 includes a rear support surface 8 for limiting the rear end of the slip flap 12, and side support surfaces 9 for limiting the two sides of the slip flap 12 respectively. The two side support surfaces 9 are inclined surfaces that move away from each other from bottom to top. By limiting the rear end and the two sides of the slip flap 12, the stability of the limiting of the slip flap 12 is ensured, and the slip flap 12 is tightly limited in the limiting groove, providing high stability for the pressing operation of the slip anchoring tooth 13. Since the two side support surfaces 9 are inclined surfaces that move away from each other from bottom to top, the two side support surfaces 9 can support and limit slip flaps 12 of different sizes.

[0047] Working principle: Connect connector 1 to the press-fit power source; select the length and number of pressure bar 2 according to the diameter and arrangement of the locking teeth 13; screw the selected pressure bar 2 into the lower internal thread of connector 1; after selecting the press-fit base 3, embed the locking teeth 12 into the positioning groove 5 of the press-fit base 3, and select a pressure bar 2 of appropriate length and a ball head structure 6 of appropriate size based on the height difference between each group of locking teeth 13 and the size of locking teeth 13, and then adjust each pressure bar 2 to be vertically aligned with the corresponding locking teeth inlay hole; apply adhesive to the locking teeth inlay hole of locking teeth 12; the pressing mechanism can be started when the locking teeth 13 are vertically embedded in the tooth hole, so that the axial pressure mechanism provides axial vertical downward pressure, driving connector 1 and pressure bar 2 to quickly and accurately complete the pressing work of locking teeth 13 at a constant angle.

[0048] The beneficial effects of this utility model are as follows: by assembling the connector 1 and the pressure bar 2, and using the pressure base 3 to fix the slip 12, the pressure work of the slip anchoring tooth 13 is completed. Its simple, practical and reliable design structure is easy for operators to learn and use quickly.

[0049] Before pressing begins, multiple locking teeth 13 can be pressed into place at once by selecting the appropriate specifications and quantity of the pressing tooth rod 2. Simultaneously, the connector 1 can be adapted to various pressing tooth rods 2 with different end thicknesses or lengths, ensuring that the pressing angle and depth of the locking teeth 13 are consistent and constant. This ensures effective and uniform anchoring of the locking teeth, effectively avoiding problems such as uneven loading or uneven anchoring, and improving the load-bearing capacity and anchoring stability of the anchoring structure.

[0050] The method is convenient and safe, enabling rapid and precise pressing of the soluble bridge plug slip anchoring teeth 13. This effectively improves the stability and reliability of the soluble bridge plug, solves the problem of uneven slip loading or uneven anchoring, reduces the risk of the soluble bridge plug falling off at the bottom of the well, and transmits a uniform and stable setting force to the soluble bridge plug during the ignition and setting process, ensuring the smooth progress of multi-stage fracturing operations and reducing the fracturing operation cycle and economic costs.

[0051] In the description of this utility model, it should be understood that the terms "center", "length", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "inner", "outer", "circumferential", "circumferential", 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 utility model and simplifying the description, and do not indicate or imply that the system 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 utility model.

[0052] In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0053] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0054] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0055] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A soluble bridge plug anchoring tooth pressing mechanism, characterized in that, The device includes a connector (1), a pressure bar (2), and a pressing base (3). The upper part of the connector (1) is provided with a connecting part for connecting to the pressing power source. The bottom of the connector (1) is provided with several bottom threaded holes (4). The top of the pressure bar (2) is located in the bottom threaded holes (4) and is threadedly connected to the bottom threaded holes (4). The pressing base (3) is located vertically below the pressure bar (2). The upper surface of the pressing base (3) is provided with a positioning groove (5) for positioning the locking flap (12).

2. The soluble bridge plug anchoring tooth pressing mechanism according to claim 1, characterized in that, The bottom of the pressure bar (2) is provided with a ball head structure (6).

3. The soluble bridge plug anchoring tooth pressing mechanism according to claim 2, characterized in that, The ball head structure (6) is made of copper, aluminum, plastic, or rubber.

4. The soluble bridge plug anchoring tooth pressing mechanism according to claim 2, characterized in that, The ball head structure (6) and the pressure bar (2) are an integrated structure.

5. The soluble bridge plug anchoring tooth pressing mechanism according to claim 2, characterized in that, The ball head structure (6) is fixedly connected to the pressure bar (2).

6. The soluble bridge plug anchoring tooth pressing mechanism according to claim 2, characterized in that, The ball head structure (6) is detachably and fixedly connected to the pressure bar (2).

7. The soluble bridge plug anchoring tooth pressing mechanism according to claim 1, characterized in that, The positioning groove (5) includes at least a bottom support surface (7) for supporting the valve flap (12) and a rear support surface (8) for limiting the rear end of the valve flap (12). The bottom support surface (7) is gradually inclined downward from one end away from the rear support surface (8) to one end close to the rear support surface (8).

8. The soluble bridge plug anchoring tooth pressing mechanism according to claim 1, characterized in that, The positioning groove (5) includes a rear support surface (8) for limiting the rear end of the valve flap (12) and a side support surface (9) for limiting the two sides of the valve flap (12) respectively. The two side support surfaces (9) are inclined surfaces that are far apart from each other from bottom to top.

9. A soluble bridge plug anchoring tooth pressing mechanism according to any one of claims 1 to 8, characterized in that, The connecting part is a cylindrical structure disposed on the upper part of the connector (1), and the cylindrical structure is provided with external threads (10).

10. A soluble bridge plug anchoring tooth pressing mechanism according to any one of claims 1 to 8, characterized in that, The connecting part is a sidewall connecting hole (11) provided on the sidewall of the connector (1).

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