Hydraulic slip for working under pressure

Abstract

The application discloses a hydraulic slip for pressure operation and relates to the technical field of oil drilling devices.The hydraulic slip comprises two slip assemblies, the slip assemblies are arranged in a stacked mode from top to bottom, and the two slip assemblies are symmetrical about a plane where the two slip assemblies are stacked; each slip assembly comprises a slip seat, a sliding block seat assembled on the inner wall of the slip seat, a plurality of connecting bodies arranged in the slip seat and in sliding fit with the sliding block seat, a top plate arranged on the slip seat, and a telescopic hydraulic cylinder hingedly connected at one end to the lower side of the top plate and at the other end to the bottom of the connecting body; and the application solves the technical problems of single function and insufficient reliability of the existing hydraulic slip. The two slip assemblies arranged in a stacked mode from top to bottom can realize the functions of clamping and preventing the top.

Description

Technical Field

[0001] This invention relates to the field of oil drilling equipment technology, and in particular to a hydraulic slip for live drilling operations. Background Technology

[0002] Live well operations are a key technology for maintenance and workover of oil and gas wells without controlling the well or stopping production. They are crucial for improving oil and gas field recovery rates and reducing operating costs. Hydraulic slips, as the core component of live well operations equipment, primarily function to reliably clamp or release the downhole tubing during operations, achieving precise control of the tubing and preventing it from falling into the well due to its own weight or being pushed out of the wellhead by high pressure at the bottom of the well, thus ensuring operational safety.

[0003] Existing hydraulic clamps typically only perform a single clamping function. For example, ordinary hydraulic clamps can only clamp the pipe string downwards (for upright installation) to prevent it from falling; while anti-overturn clamps require other structures or inverted installation to prevent the pipe string from overturning. This functional separation design means that a single set of equipment cannot simultaneously meet the needs of both upright installation (such as support when raising or lowering the pipe string) and inverted installation (such as anti-overturning), increasing the variety of equipment and the complexity of replacement operations.

[0004] Furthermore, in pressurized operations, the tubing string not only bears axial loads but also often needs to withstand the counter-torque generated by rotational operations (such as milling and drilling). Some existing hydraulic slip structures lack effective counter-torque bearing designs, or their anti-torque structures are complex and unreliable, making them prone to slippage or damage when subjected to large torques, affecting operational efficiency and safety. Summary of the Invention

[0005] The purpose of this invention is to provide a hydraulic slip for live operation, which solves the technical problems of existing hydraulic slips having limited functionality and insufficient reliability.

[0006] This application discloses a hydraulic slip for live operation, including two slip assemblies, which are stacked one on top of the other, and the two slip assemblies are symmetrical about the plane where they are stacked. The KaVo component includes: V-shaped base; A slider seat is assembled on the inner wall of the slip seat; A connecting body is disposed within the locking seat, and the connecting body is slidably engaged with the slider seat; Top plate, disposed on the slip seat; The telescopic hydraulic cylinder has one end hinged to the bottom of the top plate and the other end hinged to the bottom of the connecting body.

[0007] This application designs a slip assembly that uses a telescopic hydraulic cylinder for lifting and lowering to move the connector closer to or away from the pipe column. This not only enables upright clamping of the pipe column but also provides anti-tipping function for inverted installation.

[0008] Based on the above technical solution, the present application can be further improved as follows: Furthermore, the inner wall of the slider seat is provided with a downwardly inclined groove; The connector is provided with a protrusion that mates with the slot. The advantage of this step is that the protrusion and the slot work together to achieve stable movement of the connector.

[0009] Furthermore, the protrusion is T-shaped, and the beneficial effect of this step is that it can cooperate with the slot to achieve the function of resisting torque.

[0010] Furthermore, the inner wall of the connector is equipped with a clamp head, and a snap fastener assembly is provided between adjacent connectors to achieve synchronous movement. The beneficial effect of this step is that synchronous movement between multiple connectors can be achieved through the snap fastener assembly.

[0011] Furthermore, the snap fastener assembly includes: Multiple first limiting blocks are installed from top to bottom at one end of the connecting body; Multiple second limiting blocks are installed from top to bottom at one end of another connecting body, and any second limiting block is located between any two adjacent first limiting blocks. The beneficial effect of this step is that hard synchronization can be achieved by the cooperation of multiple limiting blocks.

[0012] Furthermore, the outer walls of both the first and second limiting blocks are wedge-shaped. The advantage of this step is that the wedge shape can provide sufficient space, facilitating the stable movement of the connecting body.

[0013] Furthermore, a pressure plate is installed on the top of the connector, the free end of the pressure plate is a hook segment, and the top of the pliers head is provided with a recess that cooperates with the hook segment. The beneficial effect of this step is that the pliers head can be stably fixed by the pressure plate, ensuring the stability of subsequent clamping.

[0014] Furthermore, a limiting groove is provided at the bottom of the connector, and a limiting protrusion that cooperates with the limiting groove is provided at the bottom of the pliers head. The beneficial effect of this step is that the limiting groove and the limiting protrusion cooperate with each other to ensure the stable assembly of the pliers head.

[0015] Furthermore, there are four connecting bodies, which are arranged in a cylindrical shape. There are also four telescopic hydraulic cylinders, which are inclined and correspond to the connecting bodies one by one.

[0016] Furthermore, the inner wall of the connector is provided with an assembly groove, and the outer wall of the pliers head is provided with an assembly protrusion that mates with the assembly groove. The beneficial effect of this step is to ensure the stable assembly of the pliers head.

[0017] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages: 1. This application discloses a hydraulic slip for live operation. By using two slip assemblies that are symmetrically stacked, the slip assembly can achieve the functions of clamping and preventing top-loading. At the same time, the slip assembly is driven up and down by a telescopic hydraulic cylinder, which can ensure the stability of the slip assembly when it is inverted.

[0018] 2. This application designs the slot and the protrusion to form a sliding fit, which not only guides the connecting body but also provides anti-torque functionality.

[0019] 3. This application provides a male-female buckle assembly on the outside of the connector, which can realize the synchronous movement of multiple connectors, ensure the uniform formation of force during clamping, and thus ensure the stability of clamping. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a hydraulic chuck for live operation according to a specific embodiment of the present invention; Figure 2 for Figure 1 A magnified view of part A; Figure 3 for Figure 1 Schematic diagram of the structure after removing the locking seat; Figure 4 for Figure 1 Top view; Figure 5 for Figure 4 CC-direction sectional view.

[0022] The attached figures are labeled as follows: 1-Kava assembly; 101-Clip seat; 102-Slider seat; 103-Connector; 104-Top plate; 105-Telescopic hydraulic cylinder; 106-Clip groove; 107-Protrusion; 108-Mother and daughter buckle assembly; 109-First limiting block; 110-Second limiting block; 111-Pressure plate; 112-Pliers head; 113-Recess; 114-Limiting groove; 115-Limiting protrusion; 116-Assembly groove; 117-Assembly protrusion. Detailed Implementation

[0023] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention. It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0024] In the description of this application, it should be understood that the terms "upper", "lower", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0025] In this application, unless otherwise expressly specified and limited, the terms "installation," "setup," 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. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] To better understand the above technical solutions, the following will provide a detailed description of the technical solutions in conjunction with the accompanying drawings and specific embodiments.

[0027] Example: In oil and gas extraction and well workover operations, live-line operation technology is a key means to ensure well control safety and improve operational efficiency. During live-line operations, the wellhead is usually under high pressure, and the tubing string (such as drill pipe and tubing) needs to be pulled out and pulled in without pressurizing the well. At this time, slips, as the core clamping component of live-line operation equipment, reliably clamp the tubing string, preventing it from falling into the well due to its own weight or being pushed out of the wellhead under the high pressure at the bottom of the well, thereby ensuring operational safety. However, in practical applications, traditional hydraulic slips are often only used as ordinary slips, with limited functionality and lacking anti-push-out capabilities.

[0028] Regarding the above issues, such as Figure 1-5 As shown, this application discloses a hydraulic slip for live operation. Through improvements to its structure and usage, it can achieve the functions of clamping and anti-overturning. Specifically, it includes two slip components 1, which are stacked one on top of the other. The two slip components 1 are symmetrical about the plane where they are stacked, that is, two identical slip components 1, one installed upright and the other installed upside down. This can achieve different functions, namely clamping and anti-overturning.

[0029] like Figure 1 As shown, the kava assembly 1 includes: Kawasuke 101; The slider seat 102 is assembled on the inner wall of the slip seat 101; The connecting body 103 is disposed within the locking seat, and the connecting body is slidably engaged with the slider seat; Top plate 104 is disposed on the slip seat 101; The telescopic hydraulic cylinder 105 is hinged at one end to the bottom of the top plate 104 and at the other end to the bottom of the connecting body 103.

[0030] The slip assembly 1 in this application is used as a single unit. During assembly, symmetry must be ensured to guarantee stability during clamping. Specifically, the lower slip assembly 1 is installed upright and used as a conventional slip, while the upper slip assembly 1 is installed upside down and used as a top protection to resist the upward thrust from the bottom of the well.

[0031] The specific structure of the locking seat 2, used to install and support the moving parts of the locking seat, is made of existing metal materials, which will not be described in detail here. It forms a certain space inside for installing subsequent components, serving as both a protective element and a supporting framework.

[0032] The slider seat 102 is a guide component located inside the slip seat. It can be installed on the slip seat by bolts. At the same time, a sliding groove is provided on the inner wall of the slider seat 3, which facilitates the movement of the connecting body along the sliding groove, thereby realizing the clamping or loosening of the slip.

[0033] Compared to existing slip components, the slip component in this application uses a telescopic hydraulic cylinder 105 to drive the connecting body 103 to move up and down. This can prevent the corresponding parts from shifting or falling off even if it is installed upside down, thus ensuring structural stability.

[0034] The upper surface of the top plate 104 is flat, which ensures stability during inversion.

[0035] This application constructs a double-slip assembly structure with symmetrical upper and lower stacking, and achieves reliable clamping and rapid release of the tubing column through the sliding fit between the slider seat and the connecting body and the hinged drive of the telescopic hydraulic cylinder. At the same time, the inverted installation method also plays a role in preventing top-down.

[0036] In order to ensure the stable up-and-down movement of the connector 103 in this application, the inner wall of the slider seat 102 in this application is provided with a downwardly inclined groove 106. The connector 103 is provided with a protrusion 107 that cooperates with the slot 106. That is, in this application, the protrusion 107 moves along the slot 106, thereby enabling the connector 103 to move stably. Preferably, the slot 106 is tilted at an angle of 9.46°, which ensures that the connector can move stably and thus can be clamped more stably.

[0037] In order to achieve the function of anti-torque, the protrusion 107 in this application is specifically T-shaped, and limit grooves are opened on both sides of the protrusion. The two sides of the slot 106 are L-shaped, and the ends are located inside the limit grooves. This forms at least two mating forms: one is that the end of the protrusion 107 mates with the bottom of the slot 106, and the other is that the two ends of the slot 106 mate with the two sides of the slot 106 to complete the limit.

[0038] This application has multiple connectors 103, which are combined to form a cylindrical shape. The internal components include clamping heads, jaw plates, etc., for clamping. When the multiple connectors 103 move up and down, they need to move synchronously. Therefore, this application designs a mating structure between adjacent connectors. Specifically, a snap fastener assembly 108 is provided between adjacent connectors 103 to achieve synchronous movement. The inner wall of the connector 103 is equipped with clamping heads 112.

[0039] Regarding the snap fastener assembly 108, such as Figure 3 As shown, the snap fastener assembly 108 includes: Multiple first limiting blocks 109 are installed from top to bottom at one end of the connecting body 103; Multiple second limiting blocks 110 are installed from top to bottom on one end of another connecting body 103, and any second limiting block 110 is located between any two adjacent first limiting blocks 109; the male and female fastening components 108 in this application can be multiple, and each male and female fastening component 108 is used to complete the synchronization of a group of adjacent connecting bodies. Specifically, the first limiting block 109 is installed on the connecting body 103, and the second limiting block 110 is installed on the connecting body 103 adjacent to the aforementioned connecting body 103. In this way, the two limiting blocks cooperate to realize the synchronous opening and tightening of the connecting body 103.

[0040] Because the connecting body moves inside the locking seat 101, in order to reduce interference, the outer walls of the first limiting block 109 and the second limiting block 110 in this application are wedge-shaped, thus providing sufficient space to achieve stable opening of the connecting body 103.

[0041] To ensure stable assembly of the pliers head, a pressure plate 111 is installed on the top of the connector 103. The free end of the pressure plate 111 is a hook section, and the top of the pliers head 112 is provided with a recess 113 that cooperates with the hook section. This can limit the position of the pliers head and ensure its stability.

[0042] At the same time, such as Figure 5 As shown, the bottom of the connector 103 in this application has a limiting groove 114, and the bottom of the pliers 112 is provided with a limiting protrusion 115 that cooperates with the limiting groove 114, so as to ensure the stability of the assembly of the pliers 112.

[0043] There are four connecting bodies 103, which are arranged in a cylindrical shape. There are also four telescopic hydraulic cylinders 105, which are inclined and correspond to each of the connecting bodies 103.

[0044] The inner wall of the connector 103 is provided with an assembly groove 116, and the outer wall of the clamp head 112 is provided with an assembly protrusion 117 that cooperates with the assembly groove 116.

[0045] Further explanation regarding this application: When tubing clamping is required, the telescopic hydraulic cylinder 105 operates. The piston rod of the telescopic hydraulic cylinder 105 drives the connecting body 103 to move. Since the connecting body 103 slides in conjunction with the slider seat 102 fixed to the inner wall of the slip seat 101, and the slider seat 102 provides tilting guidance and constraint, the tilting movement of the connecting body 103 can complete the clamping, thereby holding the tubing. At the same time, the upper slip assembly 1 of this application is an inverted structure, which can achieve the function of inverted anti-topping and prevent the tubing from detaching from the slip assembly.

[0046] Numerous specific details are set forth in this specification. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification. In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are 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.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A hydraulic slip for use in snubbing operations, characterized by, It includes two cladding components (1), which are stacked one on top of the other, and the two cladding components (1) are symmetrical about the plane where they are stacked. The KAVO component (1) includes: Kawasaki (101); A slider seat (102) is assembled on the inner wall of the slip seat (101); Multiple connectors (103) are disposed within the locking seat (101), and the connectors (103) slide in cooperation with the slider seat (102); The top plate (104) is disposed on the slip seat (101); The telescopic hydraulic cylinder (105) is hinged at one end to the bottom of the top plate (104) and at the other end to the bottom of the connecting body (103); The inner wall of the slider seat (102) is provided with a downwardly inclined groove (106); the connecting body (103) is provided with a protrusion (107) that cooperates with the groove (106); the inner wall of the connecting body (103) is equipped with a clamp head (112), and a male and female buckle assembly (108) is provided between adjacent connecting bodies (103) to achieve synchronous movement; The snap fastener assembly (108) includes: Multiple first limiting blocks (109) are installed from top to bottom at one end of the connecting body (103); Multiple second limiting blocks (110) are installed from top to bottom at one end of another connecting body (103), and any second limiting block (110) is located between any two adjacent first limiting blocks (109).

2. The hydraulic slip for working under pressure according to claim 1, characterized in that, The protrusion (107) is T-shaped.

3. The hydraulic chuck for live operation according to claim 1, characterized in that, The outer walls of the first limiting block (109) and the second limiting block (110) are both wedge-shaped.

4. The hydraulic chuck for live operation according to claim 1, characterized in that, The top of the connector (103) is equipped with a pressure plate (111), the free end of the pressure plate (111) is a hook section, and the top of the pliers (112) is provided with a recess (113) that cooperates with the hook section.

5. The hydraulic chuck for live operation according to claim 4, characterized in that, The bottom of the connector (103) is provided with a limiting groove (114), and the bottom of the pliers (112) is provided with a limiting protrusion (115) that cooperates with the limiting groove (114).

6. The hydraulic chuck for live operation according to claim 1, characterized in that, There are four connecting bodies (103), and the connecting bodies (103) form a cylindrical shape. There are four telescopic hydraulic cylinders (105), and the telescopic hydraulic cylinders (105) are inclined and correspond to the connecting bodies (103) one by one.

7. The hydraulic chuck for live operation according to claim 1, characterized in that, The inner wall of the connector (103) is provided with an assembly groove (116), and the outer wall of the pliers (112) is provided with an assembly protrusion (117) that mates with the assembly groove (116).

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