Emergency rescue slips assembly with bidirectional locking function and its rescue system

Abstract

The present invention discloses an emergency rescue slip assembly with a two-way locking function and its rescue system; the inner hole side wall of the slip seat of the slip assembly is an inverted conical inclined surface; a slip connection cover is fixedly connected to the top edge of the slip seat; the lifting plate is connected to the top edge of the slip seat through a telescopic mechanism; the slip body is arranged around the inner hole of the slip seat; the top end of the slip body is hinged to the lower surface of the lifting plate through a connecting rod, and the outer side wall of the slip body has a slip body outer inclined surface and a slip body outer wedging inclined surface that slide and fit with the conical inclined surface; the radial clamping mechanism can pass through the side wall of the slip seat and move along its radial direction, and press tightly against the slip body outer wedging inclined surface; the rescue system includes rescue well control equipment and a slip assembly installed at the bottom end of the rescue well control equipment. The purpose of the present invention is to enable the rescue equipment to be unaffected by the upward force and the gravity of the equipment during the rescue operation, form a two-way locking working state, always be reliably locked with the wellhead casing, and achieve safe rescue operations.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling well control emergency rescue equipment, and more specifically to an emergency rescue slip assembly with a two-way locking function and its rescue system. Background Art

[0002] During exploration and development drilling operations, if well kick or blowout occurs, it is very likely to cause accidents such as personal injuries or equipment damage. During blowout rescue operations, it is necessary to re-establish the wellhead, install and fix the rescue well control equipment to the wellhead, and carry out rescue operations. After the installation is completed, under the action of the wellhead pressure, a large upward thrust will be generated on the rescue well control equipment. Therefore, it is necessary to reliably lock the slip assembly installed at the lower part of the rescue well control equipment with the wellhead casing, and firmly connect the rescue well control equipment with the wellhead casing.

[0003] However, if the blowout or well kick rescue is successful and there is no pressure at the wellhead, the upward thrust acting on the slip assembly will disappear. Under the action of the gravity of the upper rescue well control equipment, the slip seat will move downward, causing the slips to loosen or open. This phenomenon will increase unforeseen risks for subsequent rescue operations. Since there are many uncertain factors during the rescue process, in order to achieve safe construction, the equipment must be in a locked and controlled state under the action of forces in two directions (upward thrust and equipment gravity) during rescue. However, the existing slip equipment can only achieve locking in a single direction.

[0004] Therefore, how to provide an emergency rescue slip assembly with a two-way locking function and its rescue system is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides an emergency rescue slip assembly with a two-way locking function and its rescue system, aiming to solve the above technical problems.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] An emergency rescue slip assembly with a two-way locking function, comprising:

[0008] A slip seat; the inner hole side wall of the slip seat is an inverted conical slope; a slip connection cover is fixedly connected to the top edge of the slip seat, and a first through hole for the wellbore casing to pass through is opened on the top surface of the slip connection cover;

[0009] A lifting plate; the lifting plate is connected to the top edge of the slip seat through a telescopic mechanism and is located inside the slip connection cover, and a second through hole corresponding to the first through hole is opened in the middle of the lifting plate;

[0010] Slip body; the number of the slip bodies is multiple, and they are arranged around the inner hole of the slip seat; the top end of the slip body is hinged to the lower surface of the lifting plate through a connecting rod, the outer side wall of the slip body has a slip body outer inclined surface that slidably fits with the conical inclined surface, and the upper part of the outer side wall of the slip body has a slip body outer wedging inclined surface that forms an angle with the conical inclined surface;

[0011] Radial clamping mechanism; the number of the radial clamping mechanisms is the same as that of the slip bodies, and they correspond to the multiple slip bodies one by one and are connected to the side wall of the slip seat; the radial clamping mechanism can move through the side wall of the slip seat along its radial direction and abut against the slip body outer wedging inclined surface.

[0012] Through the above technical solutions, in the present invention, through the conical surface cooperation of the slip seat and the slip body, and the radial clamping mechanisms uniformly arranged on the side wall of the slip seat, when the slips are closed, the slip bodies move downward along the mating conical surface in the slip seat to form a self-tightening state of getting tighter and tighter, and this state can control the influence caused by the upward thrust; meanwhile, when driving the radial clamping mechanism to move towards the wellhead center and making it abut against the slip body outer wedging inclined surface of the slip body, another locking state of the slip body is formed, and this state can control the influence caused by the gravity of the emergency well control equipment; in this way, the slips are in a double-direction locking working state, which can effectively ensure the safety of the emergency rescue operation.

[0013] Preferably, in the above emergency rescue slip assembly with a double-direction locking function, the telescopic mechanism includes a hydraulic cylinder; a plurality of mounting holes are axially opened downward along the top edge of the slip seat, the fixed rod of the hydraulic cylinder is fixed in the mounting holes, and the top end of the piston rod of the hydraulic cylinder is fixedly connected to the lifting plate through a locking screw. The hydraulic cylinder can drive the lifting plate to realize the lifting action to realize the locking and releasing functions, and the structure is simple and effective, and the driving is stable and reliable.

[0014] Preferably, in the above emergency rescue slip assembly with a double-direction locking function, the radial clamping mechanism includes a lead screw and a locking wedge block; the side wall of the slip seat is radially provided with a threaded hole and a guide hole that are sequentially communicated from outside to inside; the lead screw is threadedly connected to the threaded hole; the locking wedge block is slidably connected in the guide hole, one end of the locking wedge block is rotatably connected to the end of the lead screw, and the other end forms a wedge-shaped inclined surface that abuts against the slip body outer wedging inclined surface. The cooperation structure of the lead screw and the locking wedge block provided by the present invention can convert the rotational movement of the lead screw into the linear movement of the locking wedge block. In order to meet the requirement of the screwing force, the end of the lead screw away from the locking wedge block has a hexagonal or quadrilateral screwing head, and can be screwed in and out through tools.

[0015] Preferably, in the above-mentioned emergency rescue slip assembly with a two-way locking function, the end of the screw rod facing the locking wedge has a T-shaped block; the end of the locking wedge facing the screw rod has a T-shaped groove rotatably connected to the T-shaped block. The cooperation of the T-shaped block and the T-shaped groove can not only satisfy the rotational connection between the two, but also prevent the locking wedge from coming out.

[0016] Preferably, in the above-mentioned emergency rescue slip assembly with a two-way locking function, the cross-section of the locking wedge is oval or polygonal. The locking wedge is designed with an oval or polygonal structure to prevent the locking wedge from rotating together when the screw rod rotates; here, the shape of the locking wedge can preferably be a rectangular structure.

[0017] Preferably, in the above-mentioned emergency rescue slip assembly with a two-way locking function, a U-shaped seat is fixed to the bottom surface of the lifting plate; one end of the connecting rod is rotatably connected to the U-shaped seat through a pin shaft; the top end of the slip body has a U-shaped groove, and the other end of the connecting rod is rotatably connected to the U-shaped groove through a pin shaft. The U-shaped seat and the U-shaped groove can meet the articulated connection structure at both ends of the connecting rod, are easy to install, and have strong stability.

[0018] Preferably, in the above-mentioned emergency rescue slip assembly with a two-way locking function, a positioning steel ring groove is provided on the top surface of the slip connection cover, and the positioning steel ring groove is concentrically provided outside the first through hole; a plurality of connecting bolt holes are also provided on the top surface of the slip connection cover and are arranged around the positioning steel ring groove; the bottom edge of the slip connection cover has a radially protruding flange, and the flange is tightly connected to the top edge of the slip seat through connecting screws. The structures such as the positioning steel ring groove, the connecting bolt holes and the flange provided on the slip connection cover can facilitate the connection at both ends of the slip connection cover.

[0019] Preferably, in the above-mentioned emergency rescue slip assembly with a two-way locking function, a plurality of water mist channels are provided on the side wall of the slip connection cover. Clean water can be input to cool down the wellhead and avoid dangers such as fires.

[0020] Preferably, in the above-mentioned emergency rescue slip assembly with a two-way locking function, a dovetail groove is provided on the inner side wall of the slip body, and a slip tooth is installed in the dovetail groove; the slip tooth is fastened to the slip body through a limit screw. The dovetail groove and the limit screw can cooperate to realize the limit fixation of the slip tooth, with a stable and reliable structure, and are convenient for disassembly and replacement after wear.

[0021] The present invention also provides a rescue system, which includes a rescue well control device and the above-mentioned emergency rescue slip assembly with a two-way locking function installed at the bottom end of the rescue well control device; the top end of the wellbore casing is connected to the rescue well control device, and sequentially passes through the first through hole and the second through hole downward, and is clamped between a plurality of slip bodies.

[0022] Through the above technical solution, the rescue system provided by the present invention adopts an emergency rescue slip with a two-way locking function, so that the forces in two directions acting on the rescue well control device, namely the upward thrust and the gravity of the device, are both in a controlled state, realizing safe rescue operations.

[0023] It can be seen from the above technical solutions that compared with the prior art, the present invention discloses an emergency rescue slip assembly with a two-way locking function and its rescue system, which has the following beneficial effects:

[0024] 1. Through the conical surface cooperation between the slip seat and the slip body, and the lead screws and locking wedges uniformly distributed on the side wall of the slip seat, when the slip is closed, the slip body moves downward along the mating conical surface in the slip seat, forming a self-locking state of getting tighter and tighter. This state can control the influence caused by the upward thrust; at the same time, rotate the lead screw installed on the slip seat to drive the locking wedge to move towards the center of the wellhead. When the locking wedge abuts against the outer wedging inclined surface of the slip body of the slip body, another locking state of the slip body is formed. This state can control the influence caused by the gravity of the rescue well control device; in this way, the slip is in a two-way locking working state, which can effectively ensure safe rescue operations.

[0025] 2. The outer shape of the locking wedge of the present invention adopts an elliptical or polygonal structural design, which can prevent the locking wedge from rotating together when the lead screw is rotated.

[0026] 3. Through the cooperative setting of the angled wedge-shaped inclined surface at the front end of the locking wedge and the outer wedging inclined surface on the back of the slip body of the slip body, it can be ensured that when locking, the contact between the locking wedge and the slip body is surface-to-surface contact, which can effectively improve the locking ability.

[0027] 4. Through the setting of the lifting plate, on the one hand, the piston rods of multiple hydraulic cylinders are connected together, and on the other hand, multiple groups of slip bodies are connected together through connecting rods, which can ensure the synchronization of the opening and closing actions of the slip bodies.

[0028] 5. Through the water mist channel on the outer circumference of the slip connection cover of the present invention, clean water can be input to cool down the wellhead and avoid dangers such as fire.

[0029] 6. The emergency rescue system provided by the present invention adopts an emergency rescue slip with a two-way locking function, enabling the two-direction forces acting on the emergency rescue well control equipment, namely the upward jacking force and the equipment gravity, to be under controlled states, thus realizing safe emergency rescue operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0031] Figure 1 The drawing is a top view of the slip assembly provided by the present invention;

[0032] Figure 2 The drawing is Figure 1 the sectional view taken along A-A in

[0033] Figure 3 The drawing is a sectional view of the slip connection cover provided by the present invention;

[0034] Figure 4 The drawing is a schematic diagram of the emergency rescue system provided by the present invention.

[0035] Wherein:

[0036] 1 - slip seat; 2 - lead screw; 3 - slip body; 4 - locking wedge; 5 - slip connection cover; 6 - wedge-shaped inclined plane; 7 - outer wedge-tightening inclined plane of the slip body; 8 - connecting rod; 9 - lifting plate; 10 - limit screw; 11 - hydraulic cylinder; 12 - slip teeth; 13 - connecting screw; 14 - water mist channel; 15 - positioning steel ring groove; 16 - connecting bolt hole; 17 - conical inclined plane; 18 - outer inclined plane of the slip body; 19 - first through hole; 20 - second through hole; 21 - mounting hole; 22 - locking screw; 23 - threaded hole; 24 - guiding hole; 25 - wellbore casing; 26 - emergency rescue well control equipment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0038] See attached Figure 1 to attached Figure 2, an embodiment of the present invention discloses an emergency rescue slip assembly with a two-way locking function, including:

[0039] A slip seat 1; the inner hole side wall of the slip seat 1 is an inverted conical inclined surface 17; a slip connection cover 5 is fixedly connected to the top edge of the slip seat 1, and a first through hole 19 for the wellbore casing 25 to pass through is provided on the top surface of the slip connection cover 5;

[0040] A lifting plate 9; the lifting plate 9 is connected to the top edge of the slip seat 1 through a telescopic mechanism and is located inside the slip connection cover 5. A second through hole 20 corresponding to the first through hole 19 is provided in the middle of the lifting plate 9;

[0041] Slip bodies 3; the number of slip bodies 3 is multiple and they are arranged in a surrounding manner inside the inner hole of the slip seat 1; the top ends of the slip bodies 3 are hinged to the lower surface of the lifting plate 9 through connecting rods 8. The outer side wall of the slip body 3 has a slip body outer inclined surface 18 that slidably fits with the conical inclined surface 17, and the upper part of the outer side wall of the slip body 3 has a slip body outer wedge-tightening inclined surface 7 that forms an angle with the conical inclined surface 17;

[0042] A radial clamping mechanism; the number of radial clamping mechanisms is the same as the number of slip bodies 3, and they correspond to the multiple slip bodies 3 one by one and are connected to the side wall of the slip seat 1; the radial clamping mechanism can pass through the side wall of the slip seat 1 and move along its radial direction and abut against the slip body outer wedge-tightening inclined surface 7.

[0043] To further optimize the above technical solution, the telescopic mechanism includes a hydraulic cylinder 11; a plurality of mounting holes 21 are axially opened downward at the top edge of the slip seat 1, the fixed rod of the hydraulic cylinder 11 is fixed in the mounting holes 21, and the top end of the piston rod of the hydraulic cylinder 11 is fixedly connected to the lifting plate 9 through a locking screw 22.

[0044] To further optimize the above technical solution, the radial clamping mechanism includes a lead screw 2 and a locking wedge 4; a threaded hole 23 and a guide hole 24 that are sequentially communicated are radially opened from the outside to the inside on the side wall of the slip seat 1; the lead screw 2 is threadedly connected to the threaded hole 23; the locking wedge 4 is slidably connected in the guide hole 24, one end of the locking wedge 4 is rotatably connected to the end of the lead screw 2, and the other end forms a wedge-shaped inclined surface 6 that abuts against the slip body outer wedge-tightening inclined surface 7.

[0045] To further optimize the above technical solution, the end of the lead screw 2 facing the locking wedge 4 has a T-shaped block; the end of the locking wedge 4 facing the lead screw 2 has a T-shaped groove that is rotatably connected to the T-shaped block.

[0046] To further optimize the above technical solution, the cross section of the locking wedge 4 is elliptical or polygonal.

[0047] To further optimize the above technical solution, a U-shaped seat is fixed to the bottom surface of the lifting plate 9; one end of the connecting rod 8 is rotatably connected to the U-shaped seat through a pin shaft; the top end of the slip body 3 has a U-shaped groove, and the other end of the connecting rod 8 is rotatably connected to the U-shaped groove through a pin shaft.

[0048] See the appendix Figure 3 , on the top surface of the slip connection cover 5, a positioning steel ring groove 15 is provided, and the positioning steel ring groove 15 is concentrically provided outside the first through hole 19; on the top surface of the slip connection cover 5, a plurality of connecting bolt holes 16 arranged around the positioning steel ring groove 15 are also provided; the bottom edge of the slip connection cover 5 has a radially protruding flange, and the flange is tightly connected to the top edge of the slip seat 1 through a connecting screw 13.

[0049] To further optimize the above technical solution, a plurality of water mist channels 14 are provided on the side wall of the slip connection cover 5.

[0050] To further optimize the above technical solution, a dovetail groove is provided on the inner side wall of the slip body 3, and a slip tooth 12 is installed in the dovetail groove; the slip tooth 12 is fastened to the slip body 3 through a limit screw 10.

[0051] The above further optimized technical solutions can be arbitrarily combined under reasonable circumstances to form different implementation manners.

[0052] A usage structure of the slip assembly provided in this embodiment is: the slip assembly is installed at the bottom end of the emergency well control device 26; the top end of the wellbore casing 25 is connected to the emergency well control device 26, and successively passes downward through the first through hole 19 and the second through hole 20, and is clamped between a plurality of slip bodies 3.

[0053] When the slip assembly is hydraulically closed, the slip body 3 moves downward along the mating conical surface in the slip seat 1 to form a self-tightening state of getting tighter and tighter, and this state can control the influence caused by the upward thrust; at the same time, the screw rod 2 rotatably installed on the slip seat 1 drives the locking wedge block 4 to move towards the center of the wellhead. When the wedge-shaped inclined surface 6 at the front end of the locking wedge block 4 abuts against the outer wedge tightening inclined surface 7 on the back of the slip body 3, another locking state of the slip body 3 is formed, and this state can control the influence caused by the gravity of the emergency well control device 26; in this way, the slip is in a double-locking working state, which can effectively ensure safe emergency rescue operations.

[0054] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0055] The foregoing description of the disclosed embodiments enables those skilled in the art to practice or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An emergency rescue slip assembly with a two-way locking function, characterized in that, Comprising: Slip seat (1); the inner hole side wall of the slip seat (1) is an inverted conical inclined surface (17); a slip connection cover (5) is fixedly connected to the top edge of the slip seat (1), and a first through hole (19) for the wellbore casing (25) to pass through is provided on the top surface of the slip connection cover (5); Lifting plate (9); the lifting plate (9) is connected to the top edge of the slip seat (1) through a telescopic mechanism and is located inside the slip connection cover (5), and a second through hole (20) corresponding to the first through hole (19) is provided in the middle of the lifting plate (9); Slip body (3); the number of the slip bodies (3) is multiple and they are arranged around the inner hole of the slip seat (1); the top end of the slip body (3) is hinged to the lower surface of the lifting plate (9) through a connecting rod (8), the outer side wall of the slip body (3) has a slip body outer inclined surface (18) that slidably fits with the conical inclined surface (17), and the upper part of the outer side wall of the slip body (3) has a slip body outer wedging inclined surface (7) that forms an angle with the conical inclined surface (17); Radial clamping mechanism; the number of the radial clamping mechanisms is the same as that of the slip bodies (3), and they correspond to the multiple slip bodies (3) one by one and are connected to the side wall of the slip seat (1); the radial clamping mechanism can move through the side wall of the slip seat (1) along its radial direction and abut against the slip body outer wedging inclined surface (7); The telescopic mechanism includes a hydraulic cylinder (11); a plurality of mounting holes (21) are axially opened downward at the top edge of the slip seat (1), the fixed rod of the hydraulic cylinder (11) is fixed in the mounting holes (21), and the top end of the piston rod of the hydraulic cylinder (11) is fixedly connected to the lifting plate (9) through a locking screw (22); The radial clamping mechanism includes a lead screw (2) and a locking wedge block (4); a threaded hole (23) and a guiding hole (24) that are sequentially communicated are radially opened from the outside to the inside on the side wall of the slip seat (1); the lead screw (2) is threadedly connected to the threaded hole (23); the locking wedge block (4) is slidably connected in the guiding hole (24), one end of the locking wedge block (4) is rotatably connected to the end of the lead screw (2), and the other end forms a wedge-shaped inclined surface (6) that abuts against the slip body outer wedging inclined surface (7); The cross section of the locking wedge block (4) is elliptical or polygonal.

2. The emergency rescue slips assembly with a two-way locking function according to claim 1, wherein, The end of the lead screw (2) facing the locking wedge block (4) has a T-shaped block; the end of the locking wedge block (4) facing the lead screw (2) has a T-shaped groove rotatably connected to the T-shaped block.

3. The emergency rescue slip assembly with a two-way locking function according to claim 1, characterized in that, A U-shaped seat is fixed to the bottom surface of the lifting plate (9); one end of the connecting rod (8) is rotatably connected to the U-shaped seat through a pin shaft; a U-shaped groove is provided at the top end of the slip body (3), and the other end of the connecting rod (8) is rotatably connected to the U-shaped groove through a pin shaft.

4. The emergency rescue slip assembly with a two-way locking function according to claim 1, characterized in that, The top surface of the slip connection cover (5) is provided with a positioning steel ring groove (15), and the positioning steel ring groove (15) is concentrically arranged outside the first through hole (19); the top surface of the slip connection cover (5) is further provided with a plurality of connecting bolt holes (16) arranged around the positioning steel ring groove (15); the bottom edge of the slip connection cover (5) has a radially protruding flange, and the flange is fixedly connected to the top edge of the slip seat (1) through connecting screws (13).

5. The emergency rescue slips assembly with a two-way locking function according to claim 1, characterized in that, The side wall of the slip connection cover (5) is provided with a plurality of water mist channels (14).

6. The emergency rescue slip assembly with a two-way locking function according to claim 1, characterized in that, The inner side wall of the slip body (3) is provided with a dovetail groove, and a slip tooth (12) is installed in the dovetail groove; the slip tooth (12) is fastened to the slip body (3) through a limit screw (10).

7. A rescue system, characterized in that, It includes an emergency well control device (26), and an emergency rescue slip assembly with a two-way locking function according to any one of claims 1-6 installed at the bottom end of the emergency well control device (26); the top end of the wellbore casing (25) is connected to the emergency well control device (26), and sequentially passes through the first through hole (19) and the second through hole (20) downward, and is clamped between a plurality of slip bodies (3).

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