An eccentric wedge

Abstract

The present invention relates to the field of hole deviation correction and hole deviation control, and discloses an eccentric wedge, comprising: a wedge body; a weight structure, the weight structure is arranged on the wedge body; a connecting rod; a rotating shaft, the rotating shaft is coaxially arranged with the wedge body, and the first end of the rotating shaft extends into the interior of the wedge body and is connected with the wedge body through the connecting rod; a connecting joint, the connecting joint is coaxially arranged with the rotating shaft, the first end of the connecting joint is used for connecting with a drill pipe, and the second end of the rotating shaft extends into the interior of the connecting joint from the second end of the connecting joint; an intermediate sleeve, the intermediate sleeve is arranged inside the connecting joint, and the intermediate sleeve and the connecting joint can rotate synchronously, and the intermediate sleeve is rotatably sleeved on the rotating shaft; a limiting structure, the limiting structure is arranged at the second end of the rotating shaft, and the limiting structure is used for restricting the rotating shaft from disengaging from the intermediate sleeve. The eccentric wedge provided by the present invention can be self-oriented, and when directional drilling is carried out, it is not necessary to replace the drill bit and drill pipe of a smaller size.

Description

Technical Field

[0001] The present invention relates to the field of hole deviation correction and hole deviation control during drilling, and particularly to an eccentric wedge. Background Art

[0002] An eccentric wedge is a directional tool. Existing eccentric wedges cannot achieve autonomous adjustment of the azimuth angle. Usually, after the eccentric wedge is lowered, a dedicated directional instrument is specially lowered for measurement, and the drill pipe is rotated multiple times on the ground for adjustment. The adjustment method is complex and time-consuming, and a dedicated directional tool is also required. In addition, as shown in the attached Figure 6 figure, the existing eccentric wedge includes a wedge body and a thread provided on the upper part of the wedge body, and the thread is used to connect with the drill pipe. When using the existing eccentric wedge for directional drilling, the directional drill pipe and the drill bit must pass through the original drill pipe and the thread to work. Therefore, during the directional process, it is necessary to use a drill pipe and a drill bit one size smaller for directional drilling. After the directional drilling is completed, the eccentric wedge is taken out, and the original drill bit and drill pipe are used to ream the hole first and then resume normal drilling. This not only requires additional preparation of a drill bit and a drill pipe one size smaller, increasing production input, but also requires reaming drilling, wasting time and prolonging the construction period.

[0003] Therefore, how to provide an eccentric wedge that can perform autonomous orientation and does not require replacing the drill bit and drill pipe one size smaller during directional drilling has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides an eccentric wedge that can perform autonomous orientation and does not require replacing the drill bit and drill pipe one size smaller during directional drilling.

[0005] To achieve the above object, the present invention provides the following solution:

[0006] The present invention provides an eccentric wedge, including: a wedge body; a weight structure, the weight structure is provided on the wedge body; a connecting rod; a rotating shaft, the rotating shaft is coaxially arranged with the wedge body, and the first end of the rotating shaft extends into the interior of the wedge body and is connected with the wedge body through the connecting rod; a connecting joint, the connecting joint is coaxially arranged with the rotating shaft, the first end of the connecting joint is used for connecting with the drill pipe, and the second end of the rotating shaft extends into the interior of the connecting joint from the second end of the connecting joint; an intermediate sleeve, the intermediate sleeve is arranged inside the connecting joint, and the intermediate sleeve and the connecting joint can rotate synchronously, the intermediate sleeve is rotatably sleeved on the rotating shaft; a limiting structure, the limiting structure is arranged at the second end of the rotating shaft, and the limiting structure is used to prevent the rotating shaft from coming out of the intermediate sleeve.

[0007] Preferably, the eccentric wedge further includes a bearing sleeve and two bearings. The two bearings are respectively arranged at both ends of the intermediate sleeve. Each bearing is sleeved on the rotating shaft. The bearing sleeve is coaxially arranged with the rotating shaft. The bearing sleeve is nested outside the intermediate sleeve so that the bearing sleeve and the intermediate sleeve can rotate synchronously. The connecting joint is detachably connected to the bearing sleeve so that the connecting joint and the bearing sleeve can rotate synchronously.

[0008] Preferably, the first end of the bearing close to the limiting structure abuts against the limiting structure, and the second end abuts against the first end of the bearing sleeve. A first step surface is arranged inside the bearing sleeve, and a second step surface is arranged on the rotating shaft. The first end of the bearing far from the limiting structure abuts against the first step surface, and the second end abuts against the second step surface.

[0009] Preferably, the eccentric wedge further includes an oil cup for lubricating the two bearings. The oil cup is arranged inside the connecting joint, and the axis of the oil cup coincides with the axis of the connecting joint. A plurality of oil grooves are evenly arranged in the circumferential direction of the rotating shaft. Each oil groove is arranged along the axis direction of the rotating shaft, and the first end of each oil groove is flush with the second end of the rotating shaft. The second end of each oil groove extends at least to the bearing far from the limiting structure. Each oil groove is communicated with the oil cup.

[0010] Preferably, the eccentric wedge further includes an installation structure. The installation structure divides the inner part of the connecting joint into an independent first cavity and a second cavity. The second end of the rotating shaft extends into the second cavity. A plurality of openings are arranged in the circumferential direction of the connecting joint. Each opening is communicated with the first cavity. The oil cup is arranged on the installation structure, and the oil inlet end and the oil outlet end of the oil cup are respectively arranged in the first cavity and the second cavity.

[0011] Preferably, the eccentric wedge further includes a connecting cylinder. The first end of the connecting cylinder is connected to the first end of the rotating shaft, and the second end of the connecting cylinder is connected to the wedge body through the connecting rod.

[0012] Preferably, the connecting rod is a connecting pin, and the axis of the connecting pin is perpendicular to the axis of the rotating shaft.

[0013] Preferably, a plurality of claws are arranged in the circumferential direction at one end of the wedge body far from the rotating shaft.

[0014] Preferably, a plurality of guiding grooves are arranged inside the wedge body. Each guiding groove is arranged along the axis direction of the wedge body. A guiding block is arranged on the weight structure, and the guiding block can be slidably connected with each guiding groove.

[0015] Preferably, the connecting rod is a copper connecting rod.

[0016] The present invention has achieved the following technical effects compared with the prior art:

[0017] The eccentric wedge provided by the present invention includes: a wedge body; a weight structure disposed on the wedge body; a connecting rod; a rotating shaft coaxially disposed with the wedge body, and a first end of the rotating shaft extends into the interior of the wedge body and is connected to the wedge body through the connecting rod; a connecting joint coaxially disposed with the rotating shaft, a first end of the connecting joint is used for connecting with a drill pipe, and a second end of the rotating shaft extends into the interior of the connecting joint from a second end of the connecting joint; an intermediate sleeve disposed in the interior of the connecting joint, and the intermediate sleeve and the connecting joint can rotate synchronously, and the intermediate sleeve is rotatably sleeved on the rotating shaft; a limiting structure disposed at a second end of the rotating shaft, and the limiting structure is used for restricting the rotating shaft from disengaging from the intermediate sleeve.

[0018] During the lowering process, the wedge body does not rotate with the rotation of the drill pipe, and the wedge body can rotate freely. Under the action of the weight structure, the guiding inclined surface of the wedge body can maintain a preset azimuth angle after reaching the bottom of the hole, thereby realizing autonomous orientation.

[0019] After being lowered to the bottom of the hole, a drilling pressure is applied through the drill pipe. While the wedge body bites into the bottom of the hole, the connecting rod is sheared off. The wedge body with the weight block is separated from the upper structure. The drill pipe is lifted, and the wedge body remains at the bottom of the hole, thereby using its guiding inclined surface for directional drilling. Since there is no thread setting, and the drill pipe is lifted before directional drilling, there is no need to replace a smaller-sized drill pipe and drill bit during directional drilling. A drill bit is directly installed on the directional drill pipe, and directional drilling can be realized by using the original drill pipe and drill bit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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 to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 It is a schematic structural diagram of the eccentric wedge provided in the embodiment of the present invention;

[0022] Figure 2 is Figure 1 a cross-sectional view of;

[0023] Figure 3 It is a schematic structural diagram of the rotating shaft of the eccentric wedge provided in the embodiment of the present invention

[0024] Figure 4 It is a schematic structural diagram of the wedge body of the eccentric wedge provided in the embodiment of the present invention;

[0025] Figure 5Schematic structural diagram of the eccentric wedge guide block provided in the embodiment of the present invention;

[0026] Figures 1-5 Explanation of reference numerals: 100, eccentric wedge; 1, wedge body; 2, counterweight structure; 3, connecting rod; 4, rotating shaft; 5, connecting joint; 6, intermediate sleeve; 7, limiting structure; 8, bearing sleeve; 9, bearing; 10, second step surface; 11, third step surface; 12, oil cup; 13, mounting structure; 14, connecting cylinder; 15, claw; 16, guide groove; 17, guide block; 18, drill pipe; 19, oil groove; 20, opening; 21, guide inclined surface; 22, washer.

[0027] Figure 6 Schematic structural diagram of the existing eccentric wedge.

[0028] Figure 6 Explanation of reference numerals: 30, wedge body; 31, screw thread. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying 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.

[0030] The purpose of the present invention is to provide an eccentric wedge that can self-orient and does not require replacing the drill bit and drill pipe of a smaller size during directional drilling.

[0031] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0032] Refer to Figures 1-5 As shown, the eccentric wedge 100 provided in this embodiment includes: a wedge body 1; a counterweight structure 2, the counterweight structure 2 is arranged on the wedge body 1; a connecting rod 3; a rotating shaft 4, the rotating shaft 4 is coaxially arranged with the wedge body 1, and the first end of the rotating shaft 4 extends into the interior of the wedge body 1 and is connected to the wedge body 1 through the connecting rod 3; a connecting joint 5, the connecting joint 5 is coaxially arranged with the rotating shaft 4, the first end of the connecting joint 5 is used to connect with the drill pipe 18, and the second end of the rotating shaft 4 extends into the interior of the connecting joint 5 from the second end of the connecting joint 5; an intermediate sleeve 6, the intermediate sleeve 6 is arranged inside the connecting joint 5, and the intermediate sleeve 6 and the connecting joint 5 can rotate synchronously, and the intermediate sleeve 6 is rotatably sleeved on the rotating shaft 4; a limiting structure 7, the limiting structure 7 is arranged at the second end of the rotating shaft 4, and the limiting structure 7 is used to limit the rotating shaft 4 from disengaging from the intermediate sleeve 6. The eccentric wedge provided in this embodiment can self-orient and does not require replacing the drill bit and drill pipe of a smaller size during directional drilling.

[0033] In this embodiment, in order to reduce the friction between the rotating shaft 4 and the connecting joint 5, as Figures 1-2 shown, the eccentric wedge 100 further includes a bearing sleeve 8 and two bearings 9. The two bearings 9 are respectively arranged at both ends of the intermediate sleeve 6. Each bearing 9 is sleeved on the rotating shaft 4. The bearing sleeve 8 is coaxially arranged with the rotating shaft 4. The bearing sleeve 8 is nested outside the intermediate sleeve 6 so that the bearing sleeve 8 and the intermediate sleeve 6 can rotate synchronously. The connecting joint 5 is detachably connected to the bearing sleeve 8 so that the connecting joint 5 and the bearing sleeve 8 can rotate synchronously. Specifically in this embodiment, the connecting joint 5 and the bearing sleeve 8 are connected by threads.

[0034] Specifically in this embodiment, the bearing sleeve 8 and the intermediate sleeve 6 are in interference fit.

[0035] In this embodiment, as Figures 2-3 shown, the first end of the bearing 9 close to the limiting structure 7 abuts against the limiting structure 7, and the second end abuts against the first end of the bearing sleeve 8. A first step surface is arranged inside the bearing sleeve 8, and a second step surface 10 is arranged on the rotating shaft 4. The first end of the bearing 9 far from the limiting structure 7 abuts against the first step surface, and the second end abuts against the second step surface 10.

[0036] Further, the limiting structure 7 is two nuts, and each nut is threadedly connected to the rotating shaft 4.

[0037] Further, washers 22 are arranged between the two nuts and the bearings 9 close to the two nuts. The first end of the bearing 9 close to the limiting structure 7 abuts against the washer 22.

[0038] In this embodiment, in order to lubricate the bearing 9, as Figures 2-3 shown, the eccentric wedge 100 further includes an oil cup 12 for lubricating the two bearings 9. The oil cup 12 is arranged inside the connecting joint 5, and the axis of the oil cup 12 coincides with the axis of the connecting joint 5. A plurality of oil grooves 19 are evenly arranged in the circumferential direction of the rotating shaft 4. Each oil groove 19 is arranged along the axis direction of the rotating shaft 4, and the first end of each oil groove 19 is flush with the second end of the rotating shaft 4. The second end of each oil groove 19 extends at least to the bearing 9 far from the limiting structure 7 to ensure that both bearings 9 can be lubricated. Each oil groove 19 is communicated with the oil cup 12. The specific structure of the oil cup 12 belongs to the prior art and will not be elaborated here. Specifically in this embodiment, the second end of each oil groove 19 extends to the second step surface 10. In the specific use process, the lubricant enters the oil groove 19 through the oil cup 12 and flows along the oil groove 19. When flowing through the two bearings 9, the lubrication of the two bearings 9 is completed.

[0039] In this embodiment, as Figure 3As shown, in order to reduce the entry of external drilling fluid into the lubricating oil beside the internal flushing bearing 9 of the eccentric wedge 100 provided by the present invention, a third step surface 11 is further provided on the rotating shaft 4, and the second end of the bearing sleeve 8 exceeds the second step surface 10 and extends towards the direction close to the third step surface 11.

[0040] In this embodiment, as Figure 2 shown, the eccentric wedge 100 further includes an installation structure 13. The installation structure 13 divides the inner part of the connection joint 5 into an independent first cavity and a second cavity. The second end of the rotating shaft 4 extends into the second cavity. A plurality of openings 20 are circumferentially provided on the connection joint 5, and each opening 20 is communicated with the first cavity. The oil cup 12 is arranged on the installation structure 13, and the oil inlet end and the oil outlet end of the oil cup 12 are respectively arranged in the first cavity and the second cavity. Specifically in this embodiment, the installation structure 13 is an installation plate. During the specific use process, the opening 20 is communicated with the external annulus drilling fluid to achieve the pressure balance inside and outside the drill pipe 18 during the process of lowering the drill.

[0041] In this embodiment, as Figure 2 shown, the eccentric wedge 100 further includes a connection cylinder 14. The first end of the connection cylinder 14 is connected to the first end of the rotating shaft 4, and the second end of the connection cylinder 14 is connected to the wedge body 1 through a connecting rod 3. Specifically in this embodiment, the first end of the connection cylinder 14 is threadedly connected to the first end of the rotating shaft 4. If the rotating shaft 4 is directly connected to the wedge body 1, the rotating shaft 4 is a solid structure with a large weight. By using a hollow connection cylinder 14 to connect with the wedge body 1, the weight of the eccentric wedge 100 is effectively reduced.

[0042] In this embodiment, the structure of the wedge body 1 is the same as the existing wedge body 1 structure, except that the wedge body 1 provided by the present invention does not have a thread.

[0043] In this embodiment, the connecting rod 3 is a connecting pin, and the axis of the connecting pin is perpendicular to the axis of the rotating shaft 4. It should be noted that the connecting rod 3 is not limited to being a connecting pin, and other rod-shaped structures can also be selected.

[0044] In this embodiment, as Figure 1 shown, a plurality of claws 15 are circumferentially arranged at one end of the wedge body 1 far from the rotating shaft 4. By providing the claws 15, the wedge body 1 can easily and quickly bite into the bottom of the hole.

[0045] In this embodiment, as Figures 4-5 shown, a plurality of guiding grooves 16 are arranged inside the wedge body 1, and each guiding groove 16 is arranged along the axis direction of the wedge body 1. A guiding block 17 is arranged on the weight structure 2, and the guiding block 17 can be slidably connected with each guiding groove 16. During the specific use process, the number of the weight structures 2 is determined according to actual needs, and the weight structures 2 are installed in the same or different guiding grooves 16 according to actual needs.

[0046] In this embodiment, the counterweight structure 2 is specifically a counterweight block, the guide groove 16 is a dovetail groove, and the guide block 17 is a dovetail block.

[0047] In this embodiment, in order to improve the stability of the connecting rod 3, the connecting rod 3 is a copper connecting rod. Additionally, the diameter of the connecting rod 3 is determined according to the preset shearing pressure. It should be noted that the connecting rod 3 is not limited to being made of copper material and other materials with good stability can also be selected.

[0048] During the lowering process, the drill pipe 18 is threadedly connected to the connection joint 5, and the directions of the connection joint 5, the bearing sleeve 8, and the intermediate sleeve 6 always remain consistent with the drill pipe 18. The rotating shaft 4, the connecting cylinder 14, and the wedge 1 can rotate freely and thus do not rotate with the rotation of the drill pipe 18 under the action of gravity. After reaching the bottom of the hole, the guiding inclined surface 21 of the wedge 1 can maintain the preset azimuth angle. After being lowered to the bottom of the hole, drilling pressure is applied through the drill pipe 18. While the wedge 1 penetrates into the bottom of the hole, the connecting rod 3 is sheared off. The wedge 1 with the counterweight structure 2 is separated from the upper structure. The drill pipe 18 is lifted, and the wedge 1 remains at the bottom of the hole, thereby using its guiding inclined surface 21 for directional drilling.

[0049] In this specification, specific examples are used to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. An eccentric wedge, characterized in that, Comprising: Wedge body; Counterweight structure, which is arranged on the wedge body; Connecting rod; Rotating shaft, the rotating shaft is coaxially arranged with the wedge body, and the first end of the rotating shaft extends into the interior of the wedge body and is connected to the wedge body through the connecting rod; Connecting joint, the connecting joint is coaxially arranged with the rotating shaft, the first end of the connecting joint is used for connecting with the drill pipe, and the second end of the rotating shaft extends into the interior of the connecting joint from the second end of the connecting joint; Intermediate sleeve, the intermediate sleeve is arranged inside the connecting joint, and the intermediate sleeve and the connecting joint can rotate synchronously, and the intermediate sleeve is rotatably sleeved on the rotating shaft; Limit structure, the limit structure is arranged at the second end of the rotating shaft, and the limit structure is used to limit the rotating shaft from disengaging from the intermediate sleeve.

2. The eccentric wedge according to claim 1, characterized in that, It further includes a bearing sleeve and two bearings. The two bearings are respectively arranged at both ends of the intermediate sleeve, and each bearing is sleeved on the rotating shaft. The bearing sleeve is coaxially arranged with the rotating shaft, and the bearing sleeve is nested outside the intermediate sleeve so that the bearing sleeve and the intermediate sleeve can rotate synchronously. The connecting joint is detachably connected to the bearing sleeve so that the connecting joint and the bearing sleeve can rotate synchronously.

3. The eccentric wedge according to claim 2, characterized in that, The first end of the bearing close to the limit structure abuts against the limit structure, and the second end abuts against the first end of the bearing sleeve. A first step surface is arranged inside the bearing sleeve, and a second step surface is arranged on the rotating shaft. The first end of the bearing far from the limit structure abuts against the first step surface, and the second end abuts against the second step surface.

4. The eccentric wedge according to claim 2, wherein, It further includes an oil cup for lubricating the two bearings. The oil cup is arranged inside the connecting joint, and the axis of the oil cup coincides with the axis of the connecting joint. A plurality of oil grooves are evenly arranged in the circumferential direction of the rotating shaft. Each oil groove is arranged along the axis direction of the rotating shaft, and the first end of each oil groove is flush with the second end of the rotating shaft. The second end of each oil groove extends at least to the bearing far from the limit structure, and each oil groove is communicated with the oil cup.

5. The eccentric wedge according to claim 4, characterized in that, It further includes an installation structure. The installation structure divides the interior of the connecting joint into an independent first cavity and second cavity. The second end of the rotating shaft extends into the second cavity. A plurality of openings are arranged in the circumferential direction of the connecting joint, and each opening is communicated with the first cavity. The oil cup is arranged on the installation structure, and the oil inlet end and the oil outlet end of the oil cup are respectively arranged in the first cavity and the second cavity.

6. The eccentric wedge according to claim 1, wherein It further includes a connecting cylinder. The first end of the connecting cylinder is connected to the first end of the rotating shaft, and the second end of the connecting cylinder is connected to the wedge body through the connecting rod.

7. The eccentric wedge according to claim 1 or 6, characterized in that The connecting rod is a connecting pin, and the axis of the connecting pin is perpendicular to the axis of the rotating shaft.

8. The eccentric wedge according to claim 1, characterized in that, A plurality of claws are arranged in the circumferential direction at one end of the wedge body far from the rotating shaft.

9. The eccentric wedge according to claim 1, characterized in that, A plurality of guide grooves are arranged inside the wedge body. Each guide groove is arranged along the axis direction of the wedge body. Guide blocks are arranged on the counterweight structure, and the guide blocks can be slidably connected with each guide groove.

10. The eccentric wedge according to claim 1, characterized in that, The connecting rod is a copper connecting rod.

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