A deep well slip for oil drilling

Abstract

The present invention relates to a deep well slip for oil drilling, which includes a plurality of slip bodies and self-adaptive jaw plates. Corresponding to each slip body, a plurality of arc grooves for installing the self-adaptive jaw plates are uniformly arranged circumferentially. At the top end of the inner wall of the slip body, there is a mounting member, and at the bottom end of the inner wall of the slip body, there is a mounting seat. The plurality of self-adaptive jaw plates are respectively and rotatably mounted in the plurality of arc grooves through the mounting member and the mounting seat at a certain angle. The beneficial effect is that the slip makes the force on the surface of the drill tool more uniform, the bite marks and deformation of the drill tool are extremely small, and the scrapping rate of the drill tool is greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of oil drilling, in particular to a deep well slip used for oil drilling. Background Art

[0002] Slips are wellhead tools used to clamp drill bits or casings on the turntable in oil drilling, and are also essential components in the oil drilling process. Slips are mainly composed of slip bodies and jaws. Slip bodies and jaws are also the most critical structures, which directly affect the clamping state of slips and drill bits and the degree of damage to drill bits.

[0003] At present, with the increase in the length of the horizontal section of oil and gas production, the well depth of the oil drilling industry has increased year by year, making the hanging weight of the drill tool larger and larger. The existing kavas mostly use dovetail groove embedded jaws, which are fixed inside the kavas body. In the process of the kavas clamping the drill tool, the jaws cannot adaptively adjust the angle according to the surface force of the jaws on the jaws. Because the hanging weight of the drill tool increases, when the existing kavas clamp the drill tool, the jaws will cause bite marks of varying depths on the surface of the drill tool, changing the roundness of the drill tool and causing the drill tool to deform. The reason is that the contact surface between the jaws and the drill tool is unevenly stressed, causing the depth of the local bite marks on the surface of the drill tool to increase, which in turn makes the drill tool easy to deform. When the depth of the bite marks on the surface of the drill tool reaches a certain level or the drill tool is deformed, the drill tool must be scrapped and needs to be replaced frequently, which greatly increases the cost of oil drilling.

[0004] Therefore, there is an urgent need for a deep well slip for oil drilling that can evenly stress the drill tool when the suspended weight is large and cause little damage to the drill tool. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a deep well slip for oil drilling, which solves the technical problems of uneven force on the prior slip and great damage to the drilling tool.

[0007] (II) Technical solution

[0008] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0009] The present invention provides a deep well slip for oil drilling, comprising a plurality of slip bodies and adaptive jaws, wherein the inner wall of each slip body is provided with a plurality of arc grooves for mounting the adaptive jaws along its circumference. A mounting piece is provided at the top of the inner wall of the slip body, and a mounting seat is provided at the bottom of the inner wall of the slip body. The plurality of adaptive jaws are mounted in the plurality of arc grooves in a one-to-one correspondence and rotatable manner at a certain angle through the mounting piece and the mounting seat.

[0010] Optionally, a plurality of arc grooves are uniformly arranged along the circumferential direction of the slip body. The bottom of the installation part is provided with a plurality of arc-shaped installation openings uniformly opened along its circumferential direction. The mounting seat has a plurality of arc-shaped mounting protrusions along its circumferential direction. The plurality of arc-shaped mounting openings and the plurality of arc-shaped mounting protrusions are arranged in a one-to-one correspondence up and down. The top end of each adaptive jaw plate has an arc-shaped mounting portion matching the radian of the arc-shaped mounting opening, and the top end of the adaptive jaw plate is rotatably mounted in the arc-shaped mounting opening through the arc-shaped mounting portion. The bottom end of each adaptive jaw plate has an arc-shaped mounting recess matching the radian of the arc-shaped mounting protrusion, and the bottom end of the adaptive jaw plate is rotatably mounted on the arc-shaped mounting protrusion through the arc-shaped mounting recess.

[0011] Optionally, the installation part has a limiting part for restricting the rotation of the arc-shaped installation part in the arc-shaped installation opening;

[0012] The arc-shaped installation part has a straight surface. When the arc-shaped installation part rotates in the arc-shaped installation opening until the limiting part abuts against the straight surface, the adaptive jaw plate rotates to the maximum angle.

[0013] Optionally, the limiting part restricts the maximum angle that the adaptive jaw plate can rotate by itself to 5-10°.

[0014] Optionally, the adaptive jaw plate includes a first arc surface and a second arc surface. The first arc surface faces the inner wall of the slip body, and the second arc surface faces the clamping direction of the slip body, and the arc length of the cross-section of the second arc surface is 0.09-0.1 of the cross-sectional circumference of the drill tool surface.

[0015] Optionally, the jaws are uniformly arranged from top to bottom on the second arc surface.

[0016] Optionally, it further includes a handle, and the handle is rotatably mounted at the top end of the slip body through a handle pin.

[0017] Optionally, three slip bodies are arranged in a circumferential arrangement to enclose a clamping space. The adjacent slip bodies are rotatably connected through a slip connection pin.

[0018] Optionally, among the two slip bodies at both ends, a locking buckle is arranged at the top end of one slip body, and a locking knot matching the locking buckle is arranged at the top end of the other slip body.

[0019] Optionally, the size of the cross-section of the slip body gradually increases from its bottom end to its top end.

[0020] (III) Beneficial Effects

[0021] The beneficial effects of the present invention are:

[0022] A deep well slip for oil drilling provided by the present invention installs an adaptive jaw plate inside the slip body through a mounting member and a mounting seat. When the slip body clamps a drill pipe, the adaptive jaw plate can adaptively make a certain angle adjustment according to the direction and magnitude of the force, so that the surface of the adaptive jaw plate clamping the drill pipe fits more closely to the outer surface of the drill pipe, thereby making the force on the outer surface of the drill pipe more reasonable and uniform, greatly reducing the damage to the drill pipe, significantly improving the service life of the drill pipe, and having higher stability in clamping the drill pipe. Compared with the prior art, this slip makes the force on the surface of the drill pipe more uniform, causes less damage to the drill pipe, and greatly reduces the scrapping rate of the drill pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 FIG. 6 is a three-dimensional schematic diagram of a deep well slip for oil drilling in a specific embodiment of the present invention;

[0024] Figure 2 FIG. 10 is a three-dimensional schematic diagram of the slip body in a specific embodiment of the present invention;

[0025] Figure 3 FIG. 14 is a three-dimensional schematic diagram of the adaptive jaw plate in a specific embodiment of the present invention;

[0026] Figure 4 FIG. 18 is a three-dimensional schematic diagram of the mounting member in a specific embodiment of the present invention;

[0027] Figure 5 FIG. 22 is a top view structural schematic diagram of the mounting member in a specific embodiment of the present invention;

[0028] Figure 6 FIG. 26 is a bottom view structural schematic diagram of the mounting member in a specific embodiment of the present invention;

[0029] Figure 7 FIG. 30 is a three-dimensional schematic diagram of the mounting seat in a specific embodiment of the present invention;

[0030] Figure 8 FIG. 34 is a top view schematic diagram of the prior slip during use in a specific embodiment of the present invention;

[0031] Figure 9 is Figure 8 an enlarged view of part A in

[0032] Figure 10 is Figure 8 an enlarged view of part B in

[0033] Figure 11 FIG. 50 is a top view schematic diagram of a deep well slip for oil drilling during use in a specific embodiment of the present invention;

[0034] Figure 12 is Figure 11Enlarged view at position C in [the figure];

[0035] Figure 13 is Figure 11 Enlarged view at position D in [the figure];

[0036] Figure 14 Schematic diagram of the adaptive slip biting process in the specific embodiment of the present invention;

[0037] Figure 15 Vertical cross-sectional view when a deep well slip for oil drilling is in use in the specific embodiment of the present invention.

[0038]

Explanation of reference numerals

[0039] 1: First slip body; 2: Mounting member; 21: Arc-shaped mounting opening; 22: Limiting portion; 23: Mounting plate; 24: Connecting plate; 3: Mounting seat; 31: Arc-shaped mounting protrusion; 4: Adaptive jaw plate; 41: Arc-shaped mounting portion; 42: Arc-shaped mounting recess; 5: Handle; 6: Second slip body; 7: Third slip body; 8: Dovetail groove type jaw plate. Specific embodiment

[0040] To better understand the above technical solution, the exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and the scope of the present invention can be completely conveyed to those skilled in the art. The "left" and "right" mentioned herein are based on Figure 1 the defined orientation as a reference.

[0041] As Figures 1 - 7 shown, the specific embodiment of the present invention provides a deep well slip for oil drilling. The core of the invention is to design the adaptive jaw plate 4 to be rotatable, so that the adaptive jaw plate 4 can adjust a certain angle by itself when clamping the drill pipe, and then make the surface of the adaptive jaw plate 4 clamping the drill pipe more conform to the outer surface of the drill pipe, making the outer surface of the drill pipe receive uniform force and improving the durability of the drill pipe. The slip specifically includes a plurality of slip bodies and an adaptive jaw plate 4. A plurality of arc-shaped grooves for installing the adaptive jaw plate 4 are circumferentially formed on the inner wall corresponding to each slip body. An installation member 2 is provided at the top end of the inner wall of the slip body, and an installation seat 3 is provided at the bottom end of the inner wall of the slip body. A plurality of adaptive jaw plates 4 are installed in a plurality of arc-shaped grooves in a one-to-one correspondence and rotatably by a certain angle through the installation member 2 and the installation seat 3.

[0042] Thus, the adaptive jaw plate 4 is installed inside the slip body 1 through the mounting member 2 and the mounting base 3. When the slip body clamps the drill pipe, the adaptive jaw plate 4 can adaptively adjust a certain angle according to the direction and magnitude of the force, so that the surface of the adaptive jaw plate 4 clamping the drill pipe fits the outer surface of the drill pipe more closely. As a result, the force on the outer surface of the drill pipe is more reasonable and uniform, greatly reducing the damage to the drill pipe, significantly increasing the service life of the drill pipe, and having higher stability in clamping the drill pipe. Compared with the prior art, this slip makes the force on the surface of the drill pipe more uniform, causes less damage to the drill pipe, and greatly reduces the scrap rate of the drill pipe.

[0043] Specifically, as shown in Figure 2 - Figure 7 As shown, a plurality of arc grooves are evenly arranged along the circumferential direction of the slip body. The top view shape of the mounting member 2 is a sector ring, and the arc of the sector ring matches the arc of the inner wall of the first slip body 1. On the one hand, it is convenient for installation, and on the other hand, the mounting member 2 can fit the inner wall of the first slip body 1 better, with better integrity. There are three arc-shaped mounting openings 21 evenly opened along the circumferential direction at the bottom of the mounting member 2. There are a plurality of arc-shaped mounting openings 21 evenly opened along the circumferential direction at the bottom of the mounting member 2. The mounting base 3 has a plurality of arc-shaped mounting protrusions 31 along its circumferential direction. The plurality of arc-shaped mounting openings 21 and the plurality of arc-shaped mounting protrusions 31 are arranged in a one-to-one correspondence up and down. The top end of each adaptive jaw plate 4 has an arc-shaped mounting portion 41 whose arc matches that of the arc-shaped mounting opening 21, and the top end of the adaptive jaw plate 4 is rotatably installed in the arc-shaped mounting opening 21 through the arc-shaped mounting portion 41. The bottom end of each adaptive jaw plate 4 has an arc-shaped mounting recess 42 whose arc matches that of the arc-shaped mounting protrusion 31, and the bottom end of the adaptive jaw plate 4 is rotatably installed on the arc-shaped mounting protrusion 31 through the arc-shaped mounting recess 42. The function of the mounting member 2 is, on the one hand, to provide a mounting position for the top end of the adaptive jaw plate 4, and on the other hand, to perform circumferential and radial limiting on the top end of the adaptive jaw plate 4 through the arc-shaped mounting opening 21 to prevent the top end of the adaptive jaw plate 4 from detaching from the slip body. The mounting base 3 is also an integrally formed structure, and it is fixedly installed at the bottom end of the inner wall of the slip body through bolts. The function of the mounting base 3 is, on the one hand, to provide a mounting position for the bottom end of the adaptive jaw plate 4, and to perform circumferential and radial limiting on the bottom end of the adaptive jaw plate 4 through the arc-shaped mounting protrusions 31 to prevent the bottom end of the adaptive jaw plate 4 from detaching from the slip body, and on the other hand, to evenly disperse the axial force transmitted by the adaptive jaw plate 4 to the bottom of the slip body, avoiding local indentation on the slip body and indirectly improving the durability of the slip body. And the adaptive jaw plates 4 are evenly installed inside the slip body along the circumferential direction of the mounting member 2, further making the force on the outer surface of the drill pipe more reasonable and uniform.

[0044] Furthermore, as shown in Figures 4 - 6As shown, the mounting member 2 is an integrally formed structure. The mounting member 2 has a mounting plate 23 for connecting the slip body. Threaded through-holes are provided on the mounting plate 23 and are fixedly mounted at the top end of the inner wall of the slip body through hexagon socket head cap screws and lock nuts inserted into the threaded through-holes. The mounting member 2 also has a limiting portion 22 for restricting the rotation of the arc-shaped mounting portion 41 within the arc-shaped mounting opening 21. The limiting portion 22 restricts the maximum angle that the self-adaptive jaw plate 4 can rotate by itself to be 5-10°. The cross-sectional shapes (transverse cross-sections perpendicular to the vertical direction) of both the limiting portion 22 and the mounting plate 23 are arc-shaped, and their curvatures are the same. Specifically, in this embodiment, the limiting portion 22 is an arc-shaped plate, which is arranged at intervals and concentrically with the mounting plate 23 and is located inside the mounting plate 23. The lower part of the inner arc surface of the mounting plate 23 and the upper part of the outer arc surface of the limiting portion 22 are connected by an arc-shaped connecting plate 24 with the same curvature as the two. A cavity is formed between the lower part of the inner arc surface of the mounting plate 23 and the lower part of the outer arc surface of the limiting portion 22. The arc-shaped mounting opening 21 is provided at the bottom of the connecting plate 24, that is, the arc-shaped mounting opening 21 is located at the top of the cavity. An installation cavity is formed between the edge of the arc-shaped mounting opening 21 and the outer arc surface of the limiting portion 22. The installation cavity includes a fan-shaped cavity and arc-shaped cavities extending along the circumferential direction of the connecting plate 24 at both side edges of the fan-shaped cavity. The arc-shaped cavities are located between the fan-shaped cavity and the outer arc surface of the limiting portion 22. The arc-shaped mounting portion 41 has an arc-shaped surface matching the arc of the outer arc surface of the arc-shaped mounting opening 21 (specifically, the arc of the outer arc surface of the fan-shaped cavity) for the rotation of the self-adaptive jaw plate 4. The arc-shaped mounting portion 41 also has a straight surface opposite to the outer arc surface. The limiting portion 22 restricts the maximum angle that the self-adaptive jaw plate 4 can rotate by itself through the straight surface. The cross-sectional shape of the arc-shaped mounting portion 41 is divided into a fan-shaped part and a rectangular part. The outer arc surface of the fan-shaped part constitutes the outer arc surface of the arc-shaped mounting opening 21, and the surface of the rectangular part opposite to the outer arc surface of the fan-shaped part constitutes the above-mentioned straight surface. Among them, the size of the fan-shaped part is the same as the cross-sectional size of the fan-shaped cavity, and the width of the rectangular part is smaller than the size of the cross-sectional radius of the fan-shaped cavity, so that when the arc-shaped mounting portion 41 is installed in the arc-shaped mounting opening 21 and the self-adaptive jaw plate 4 faces the drill tool, the straight surface is at a certain distance from the outer arc surface of the limiting portion 22. That is, when the arc-shaped connecting portion 41 rotates by a certain angle within the installation cavity, the outer arc surface of the limiting portion 22 will abut against a part of the straight surface of the arc-shaped connecting portion 41, preventing the arc-shaped connecting portion 41 from continuing to rotate in the same rotation direction. In the top view, with the self-adaptive jaw plate 4 facing the drill tool as the reference, during the process of the self-adaptive jaw plate 4 rotating clockwise to the maximum angle of 5°, the left part of the straight surface gradually moves away from the outer arc surface of the limiting portion 22, and the right part of the straight surface gradually approaches the outer arc surface of the limiting portion 22 until the right part of the straight surface abuts against the outer arc surface of the limiting portion 22 to form a limit, preventing the self-adaptive jaw plate 4 from rotating clockwise any further, that is, the self-adaptive jaw plate 4 has rotated clockwise to the maximum angle of 5° position.On this basis, during the process of the self - adapting jaw plate 4 rotating counter - clockwise to the maximum angle of 10°, that is, with the self - adapting jaw plate 4 facing the drill tool as the reference, during the process of the self - adapting jaw plate 4 rotating counter - clockwise to the maximum angle of 5°, similarly, the left part of the straight surface gradually approaches the outer arc surface of the limiting part 22, and the right part of the straight surface gradually moves away from the outer arc surface of the limiting part 22 until the left part of the straight surface abuts against the outer arc surface of the limiting part 22, forming a restriction that prevents the self - adapting jaw plate 4 from rotating counter - clockwise any further, that is, the self - adapting jaw plate 4 has rotated counter - clockwise to the position of the maximum angle of 5°. The mounting base 3 does not restrict the rotation of the self - adapting jaw plate 4. Thus, through the arc surface of the arc - shaped mounting part 41 in the arc - shaped mounting opening 21, the self - adapting jaw plate 4 can achieve the effect of self - adapting adjustment, and the rotation angle adjustment range of the self - adapting jaw plate 4 is restricted by the limiting part 22 and the straight surface of the arc - shaped mounting part 41, avoiding the influence on the clamped drill tool caused by the over - large rotation angle of the self - adapting jaw plate 4.

[0045] Preferably, as Figure 1 and Figure 2 shown, in the specific embodiment of the present invention, there are three self - adapting jaw plates 4 installed in the slip body. The three self - adapting jaw plates 4 cooperate with each other to clamp a part of the outer surface of the drill tool. Each self - adapting jaw plate 4 can rotate itself to adjust its outer surface that fits the drill tool, with higher flexibility and better stability.

[0046] Furthermore, as Figure 1 and Figure 11 shown, the deep - well slip for oil drilling provided by the specific embodiment of the present invention has three slip bodies arranged circumferentially to enclose a clamping space. Adjacent slip bodies are rotatably connected by slip connection pins. The slip body includes a first slip body 1, a second slip body 6, and a third slip body 7. The structural arrangements of the three slip bodies are the same. The right side of the first slip body 1 is rotatably connected to the left side of the second slip body 6 by a slip connection pin. The left side of the third slip body 7 is rotatably connected to the right side of the second slip body 6 by a slip connection pin. The first slip body 1, the second slip body 6, and the third slip body 7 enclose a clamping space. Through the first slip body 1, the second slip body 6, the third slip body 7, and the self - adapting jaw plates 4 installed in each slip body, the outer surface of the drill tool can be clamped in all directions, ensuring the clamping effect of the drill tool.

[0047] Further, in the two slip bodies at both ends, a locking buckle (not shown) is provided at the top of one slip body, and a locking knot (not shown) matching the locking buckle is provided at the top of the other slip body. In a specific embodiment of the present invention, a locking buckle is provided at the top of the first slip body 1, and a locking knot matching the locking buckle is provided at the top of the third slip body 7. The locking buckle at the top of the first slip body 1 and the locking knot at the top of the third slip body 7 improve the stability of the connection between the first slip body 1 and the third slip body 7, thereby improving the stability of the clamping space formed by the first slip body 1, the second slip body 6 and the third slip body 7, and further improving the stability of the clamping of the outer surface of the drilling tool.

[0048] Furthermore, if Figure 3 As shown, the adaptive jaw plate 4 includes a first arc surface and a second arc surface. The first arc surface faces the inner wall of the slip body, and the second arc surface faces the clamping direction of the slip body, and the arc length of the cross section of the second arc surface is 0.09 to 0.1 of the circumference of the cross section of the drill tool surface. That is, when the first slip body 1, the second slip body 6 and the third slip body 7 enclose and clamp the drill tool, from the perspective of the cross section, the total arc length of the effective contact of the nine adaptive jaw plates 4 with the drill tool surface is more than 80% of the circumference of the drill tool surface, that is, the effective contact area of ​​the adaptive jaw plates 4 with the drill tool surface is larger, further increasing the uniformity of the force on the drill tool surface. The jaws are evenly arranged from top to bottom on the second arc surface. The function of the first arc surface is to facilitate the self-rotation of the adaptive jaw plate 4, and the curvature of the second arc surface matches the outer surface of the drill tool, so that the jaws on the second arc surface can fit the outer surface of the drill tool more closely, making the force on the outer surface of the drill tool more uniform. In addition, the maintenance and replacement of the adaptive jaw plate 4 are more convenient and quicker than those of traditional multi-piece jaw plates.

[0049] Furthermore, if Figure 1 As shown, the deep well slips for oil drilling provided by the specific embodiment of the present invention also include a handle 5, which is rotatably mounted on the top of the slip body through a handle pin. The handle 5 is used to lift and lower the slips, thereby improving the convenience of using the slips.

[0050] Furthermore, if Figure 1 and Figure 15 As shown, the cross-sectional dimensions of the first slip body 1 gradually increase from its bottom to its top. That is, there is a certain inclination from the bottom to the top of the first slip body 1. Similarly, the second slip body 6 and the third slip body 7 are the same as the first slip body 1. Therefore, when the first slip body 1, the second slip body 6 and the third slip body 7 are surrounded, the outside of the three slip bodies will be combined to form an inverted cone. During operation, the slip is applied with an all-round reaction force through the outside of the slip, thereby forming an all-round clamping force on the drilling tool.

[0051] In contrast, as Figures 8 - 10 shown, it is the biting situation of the dovetail groove type jaw plate 8 adopted by the existing slips. The dovetail groove type jaw plates 8 are not evenly distributed, and the dovetail groove type jaw plates 8 are limited by the dovetail grooves on the existing slips. During the biting process, the angle cannot be adaptively adjusted according to the force on the surface of the jaws. After the clamping is completed, the depths of the bite marks are obviously different. Because the force on the outer surface of the drill tool by the dovetail groove type jaw plate 8 is uneven at the initial stage of biting, this unevenness becomes more and more prominent with the increase of the depth of the bite mark, and finally it is reflected as uneven bite marks on the surface of the drill tool. Using the dovetail groove type jaw plate 8 will make the overall force state of the drill tool extremely uneven, with too deep local bite marks on the outer surface of the drill tool, resulting in circumferential deformation of the drill tool and reducing the service life of the drill tool.

[0052] Furthermore, as Figures 11 - 13 shown, it is the biting situation of the adaptive jaw plate 4 provided by the specific embodiment of the present invention. When the slips provided by the specific embodiment of the present invention clamp the drill tool, the adaptive jaw plates 4 evenly arranged along the circumferential direction of the slip body can adaptively adjust the biting angle according to the force on the surface of the jaws, the roundness of the outer surface of the drill tool, and the relative position between itself and the drill tool during the biting process. As Figure 14 shown, it is the process of the adaptive jaw plate 4 biting the drill tool. This process has three stages, namely: the jaws contact the outer surface of the drill tool - the adaptive jaw plate 4 adjusts the angle - the outer surface of the drill tool is bitten. Among them, when the adaptive jaw plate 4 adjusts, the contact situation with the outer surface of the drill tool is adjusted, changing from initial point contact to surface contact. After the clamping is completed, the depths of the bite marks on the entire circumference of the drill tool are very uniform and the depth of the bite marks is extremely small, which indicates that during the clamping process, the force on the drill tool is very uniform, reducing the damage degree of the surface of the drill tool, and will not cause extrusion deformation of the drill tool, improving the durability of the drill tool and increasing the service life of the drill tool. Moreover, the reasonable and uniform force also makes the clamping stability of the slips on the drill tool higher. The effective contact area between the adaptive jaw plate 4 and the surface of the drill tool is also larger than that of the existing dovetail groove type jaw plate 8, further increasing the force-bearing surface area of the drill tool and making the force on the surface of the drill tool more uniform and reasonable.

[0053] As Figure 15As shown in the figure, the working principle of the deep well slip for oil drilling provided by the specific embodiment of the present invention is as follows: The slip is lifted to the periphery of the drill string through the handles 5 on the first slip body 1, the second slip body 6 and the third slip body 7, and the adaptive jaw plates 4 in the middle second slip body 6 are made to fit the outer surface of the drill string. Then, the first slip body 1 and the third slip body 7 are rotated so that the first slip body 1, the second slip body 6 and the third slip body 7 enclose to form a clamping space for clamping the drill string. Then, the first slip body 1 and the third slip body 7 are locked through the locking buckle at the top of the first slip body 1 and the locking knot at the top of the third slip body 7. After that, the slip falls to the rotary table bushing along with the drill string. The outer surface of the slip completely fits the outer conical surface of the rotary table bushing. Under the action of the gravity of the drill string and the gravity of the slip itself, the outer conical surface will generate a reaction force on the slip. Under the action of the reaction force, each adaptive jaw plate 4 inside the slip quickly goes through three stages of biting the drill string, thereby making the slip hold the drill string tightly and achieving the effect of clamping the drill string.

[0054] In the description of the present invention, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0055] In the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "connected with", "fixed" and other terms should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium; it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] In the description of this specification, the description of terms such as "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0057] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A deep well slip for oil drilling, characterized in that it includes a plurality of slip bodies and an adaptive jaw plate (4). A plurality of arc grooves for installing the adaptive jaw plate (4) are circumferentially formed in the inner wall of each slip body; An installation part (2) is provided at the top end of the inner wall of the slip body, and an installation seat (3) is provided at the bottom end of the inner wall of the slip body; A plurality of adaptive jaw plates (4) are correspondingly and rotatably installed in a plurality of arc grooves through the installation part (2) and the installation seat (3); The plurality of arc grooves are evenly arranged circumferentially along the slip body; A plurality of arc-shaped installation openings (21) are evenly formed in the circumferential direction at the bottom of the installation part (2); A plurality of arc-shaped installation protrusions (31) are provided on the installation seat (3) along its circumferential direction; The plurality of arc-shaped installation openings (21) and the plurality of arc-shaped installation protrusions (31) are arranged in a one-to-one correspondence up and down; The top end of each adaptive jaw plate (4) has an arc-shaped installation part (41) matching the radian of the arc-shaped installation opening (21), and the top end of the adaptive jaw plate (4) is rotatably installed in the arc-shaped installation opening (21) through the arc-shaped installation part (41); The bottom end of each adaptive jaw plate (4) has an arc-shaped installation recess (42) matching the radian of the arc-shaped installation protrusion (31), and the bottom end of the adaptive jaw plate (4) is rotatably installed on the arc-shaped installation protrusion (31) through the arc-shaped installation recess (42); The installation part (2) has a limiting part (22) for restricting the rotation of the arc-shaped installation part (41) in the arc-shaped installation opening (21); The arc-shaped installation part (41) has a straight surface. When the arc-shaped installation part (41) rotates in the arc-shaped installation opening (21) until the limiting part (22) abuts against the straight surface, the adaptive jaw plate (4) rotates to the maximum angle.

2. The deep well slip for oil drilling according to claim 1, characterized in that The limiting part (22) restricts the maximum angle that the adaptive jaw plate (4) can rotate by itself to 5-10°.

3. The deep well slip for oil drilling according to claim 1, characterized in that The adaptive jaw plate (4) includes a first arc surface and a second arc surface; The first arc surface faces the inner wall of the slip body, the second arc surface faces the clamping direction of the slip body, and the cross-sectional arc length of the second arc surface is 0.09-0.1 of the cross-sectional circumference of the drill pipe surface.

4. The deep well slip for oil drilling according to claim 3, characterized in that Jaws are evenly arranged from top to bottom on the second arc surface.

5. The deep well slip for oil drilling according to claim 1, characterized in that It further includes a handle (5), and the handle (5) is rotatably installed at the top end of the slip body through a handle pin.

6. The deep well slip for oil drilling according to claim 1, characterized in that There are three slip bodies arranged circumferentially to enclose a clamping space; Adjacent slip bodies are rotatably connected by slip connection pins.

7. The deep well slip for oil drilling according to claim 6, characterized in that Among the two slip bodies at both ends, a locking buckle is provided at the top end of one slip body, and a locking knot matching the locking buckle is provided at the top end of the other slip body.

8. The deep well slips for oil drilling according to claim 1, characterized in that the size of the cross-section of the slips body gradually increases from its bottom end to its top end.

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