Self-adaptive adjusting centralizer of screw drill

Abstract

The utility model discloses a self-adaptive adjusting centralizer of a screw drill. The self-adaptive adjusting centralizer comprises a centralizer body, a connecting socket, a tail end socket and a locking screw. Through the splicing mode of the dovetail groove and the dovetail boss, the connecting socket is additionally arranged, and the locking screw is matched, so that the flexible adjustment of the outer diameter of the centralizer is realized. The centralizer has the advantages of being easy and convenient to operate, high in adaptability, stable in structure and the like, is suitable for well operation of different sizes, and remarkably improves well drilling efficiency and safety.

Description

Technical Field

[0001] This utility model relates to the field of oil extraction equipment technology, specifically to an adaptive adjusting centralizer for screw drill bits. Background Technology

[0002] In oil drilling operations, the centralizer of the screw drill string plays a crucial role. It ensures that the drill string remains centered in the wellbore, reduces friction between the drill string and the well wall, improves drilling efficiency, and guarantees wellbore quality.

[0003] However, existing centralizers, such as the screw drill centralizer disclosed in patent document CN201778682U, have the following obvious structural defects:

[0004] (i) Fixed outer diameter and poor adaptability: Conventional centralizers have a fixed outer diameter, and one centralizer can only adapt to a single wellbore size. When the wellbore size changes or when it is necessary to operate in wells of different specifications, the entire centralizer structure must be replaced, which not only increases operating costs but also reduces drilling efficiency.

[0005] (ii) The replacement process is complicated: The replacement process of the central stabilizer is complicated, usually requiring professional tools such as hoisting and disassembly frames and a lot of manpower, which consumes a lot of time, seriously affects the drilling operation progress, and leads to high maintenance costs.

[0006] Therefore, developing a centralizer structure that facilitates changing the outer diameter is of great significance for improving the applicability and operational efficiency of screw drills. Utility Model Content

[0007] In view of the problems and shortcomings of the existing technology, this utility model provides an adaptive adjustment stabilizer for screw drills.

[0008] The technical solution of this utility model is as follows:

[0009] An adaptive adjusting stabilizer for a screw drill bit includes a stabilizer body, at least one connecting sleeve, an end sleeve, and a locking screw;

[0010] The body of the straightener is provided with multiple straightening protrusions along the circumference. The top surface of the straightening protrusions is provided with a dovetail boss, and one side is provided with an L-shaped groove. A connecting hole is provided on one side wall of the L-shaped groove.

[0011] The connecting sleeve has an arc-shaped structure with dovetail grooves and dovetail protrusions on the inner and outer sides, respectively. It also has an L-shaped step on the inner side and an L-shaped groove on the outer side. The L-shaped step has a connecting hole that mates with the L-shaped groove of the straightening protrusion.

[0012] The end sleeve has an arc-shaped structure with a dovetail groove and an L-shaped step on the inner side. A connecting hole is provided on one side wall of the L-shaped step.

[0013] The straightening protrusion of the centralizer body is spliced ​​with the connecting sleeve, the connecting sleeves, or the connecting sleeve and the end sleeve through the cooperation of the dovetail boss and the dovetail groove. After positioning by the L-shaped step, the spliced ​​structure is fixed by screwing the locking screw into the connecting hole. The outer diameter of the centralizer can be adaptively adjusted by increasing or decreasing the number of connecting sleeves.

[0014] Furthermore, both the connecting sleeve and the end sleeve are concentric arc-shaped structures with the straightening protrusions of the straightening body.

[0015] Furthermore, the mating surfaces of the dovetail bosses and dovetail grooves of the centralizer body, connecting sleeve, and end sleeve are all provided with anti-slip textures. Preferably, the anti-slip textures are serrated or wavy.

[0016] Furthermore, at least two locking screws are provided at each joint between the straightening ridge and the connecting sleeve, between the connecting sleeves, or between the connecting sleeve and the end sleeve, and the set screws are spaced apart along the length of the straightening ridge. Preferably, the head of the locking screw is provided with an anti-loosening washer.

[0017] Furthermore, the radial thickness of the connecting sleeve is available in various sizes.

[0018] The beneficial effects of this utility model are:

[0019] By increasing or decreasing the number of connecting sleeves, the outer diameter of the centralizer can be adjusted over a wide range, significantly improving the adaptability of the screw drill to different wellbore sizes, eliminating the need for frequent replacement of the centralizer, and reducing operating costs.

[0020] The use of dovetail grooves and dovetail bosses for splicing, combined with a quick-locking mechanism, makes the assembly and disassembly of the centralizer simple and quick, requiring only one person to complete the operation, greatly shortening the operation time and improving drilling efficiency.

[0021] It requires no complicated tools or specialized equipment, reducing manpower needs and lowering the labor intensity and safety risks for operators.

[0022] The anti-slip textured design ensures a tight fit between the stabilizer and the connecting sleeve and end sleeve, preventing relative slippage during operation.

[0023] This structure has wide applicability and can be used for various types of centralizers, such as five-direct centralizers, three-direct eccentric centralizers, and three-spiral centralizers. Attached Figure Description

[0024] Figure 1 This is a perspective view of the centralizer of this utility model installed on a screw drill bit;

[0025] Figure 2 for Figure 1 A sectional view;

[0026] Figure 3 for Figure 2 A magnified view of a section at point A in the middle;

[0027] The components represented by the reference numerals in the diagram are:

[0028] 1. Centralizer body; 2. Connecting sleeve; 3. End sleeve; 4. Locking screw; 11. L-shaped groove; 21. Detailed Implementation

[0029] The technical means adopted to achieve the intended purpose of this utility model will be further described below with reference to the accompanying drawings of the embodiments of this utility model.

[0030] Example 1

[0031] See Figure 1 The adaptive adjusting stabilizer of the screw drill tool of this utility model includes a stabilizer body 1, at least one connecting sleeve 2, an end sleeve 3, and a locking screw 4.

[0032] See Figure 1 and Figure 2 The body 1 of the straightener is the core component of the straightener. Multiple straightening protrusions are arranged around its circumference. The top surface of the straightening protrusion is provided with a dovetail boss and an L-shaped groove 11 is provided on one side. A connecting hole is provided on one side wall of the L-shaped groove 11. The connecting hole is a threaded hole.

[0033] See Figures 1-3 Connecting sleeve 2 has an arc-shaped structure, see Figure 3 It has dovetail grooves and dovetail bosses on its inner and outer sides, respectively. The inner side has an L-shaped step 21, and the outer side has an L-shaped groove. The L-shaped step 21 mates with the L-shaped groove on the straightening ridge. The L-shaped step 21 has a connecting hole that mates with the L-shaped groove on the straightening ridge. This connecting hole is a countersunk hole. A locking screw 4 passes through this hole and engages with a threaded hole on the side wall of the L-shaped groove on the straightening ridge for locking. The L-shaped groove also has a connecting hole, which is a threaded hole used for connecting and fixing to the end sleeve 3.

[0034] See Figure 2 and Figure 3 The end sleeve 3 has an arc-shaped structure with a dovetail groove and an L-shaped step on the inner side. The dovetail groove mates with the dovetail boss on the connecting sleeve 2, and the L-shaped step mates with the L-shaped groove on the connecting sleeve 2. A connecting hole is provided on one side wall of the L-shaped step. This connecting hole is a countersunk hole, which is used to connect and fix with the connecting hole at the L-shaped groove of the connecting sleeve 2.

[0035] During assembly, the centralizer body 1 is spliced ​​through the dovetail boss and the dovetail groove of the connecting sleeve 2, or between the connecting sleeve 2 and the end sleeve 3, via the cooperation of the dovetail boss and the dovetail groove. The spliced ​​structure is then fixed by screwing the locking screw 4 into the threaded hole. The cooperation of the L-shaped step and the L-shaped groove enables rapid positioning and ensures splicing accuracy. The anti-slip texture design effectively prevents relative slippage between the centralizer and the screw drill body during operation.

[0036] Both the connecting sleeve 2 and the end sleeve 3 are concentric arc-shaped structures with the centralizing ridges of the centralizer body 1. By increasing or decreasing the number of connecting sleeves 2, the outer diameter of the centralizer can be flexibly adjusted to adapt to wellbore sizes.

[0037] The mating surfaces of the dovetail bosses and dovetail grooves of the centralizer body 1, connecting sleeve 2, and end sleeve 3 are all provided with anti-slip textures. The anti-slip texture design ensures a tight fit between the centralizer and the connecting sleeve 2 and end sleeve 3, preventing relative slippage during operation. Preferably, the anti-slip texture is a serrated or wavy structure.

[0038] At least two locking screws 4 are provided at each joint between the straightening ridge and the connecting sleeve 2 or between the connecting sleeve 2 and the end sleeve 3, and the locking screws are spaced apart along the length of the straightening ridge. The head of the locking screw 4 is provided with an anti-loosening washer, which further enhances the stability of the connection.

[0039] Working principle: During drilling operations, when the wellbore size changes, the operator can increase or decrease the number of connecting sleeves 2 as needed to adjust the outer diameter of the centralizer. After assembly, each sleeve is secured with locking screws 4 to ensure the centralizer remains stable during operation. The combination of anti-slip grooves and dovetail grooves effectively prevents the centralizer from sliding and shifting, thus ensuring smooth drilling operations.

[0040] Example 2

[0041] The only difference from the embodiment is that the radial thickness of the connecting sleeve 2 has multiple size specifications. During drilling operations, when the wellbore size changes, the operator can change the specification of the standard connecting sleeve 2 as needed, thereby adjusting the outer diameter of the centralizer.

[0042] The above description represents a preferred embodiment of the present invention. However, the present invention is not limited to the above-described embodiments and examples. Within the scope of knowledge possessed by those skilled in the art, all variations, equivalent substitutions, and improvements made without departing from the concept of the present invention should be included within the protection scope of the present invention.

Claims

1. An adaptive adjusting stabilizer for screw drill bits, characterized in that, It includes a centralizer body (1), at least one connecting sleeve (2), an end sleeve (3), and a locking screw (4); Multiple straightening protrusions are arranged circumferentially on the body (1) of the straightener. The top surface of the straightening protrusion is provided with a dovetail protrusion and an L-shaped groove (11) is provided on one side. A connecting hole is provided on one side wall of the L-shaped groove. The connecting sleeve (2) has an arc-shaped structure, with dovetail grooves and dovetail protrusions on the inner and outer sides respectively. It also has an L-shaped step (21) on the inner side and an L-shaped groove on the outer side. The L-shaped step has a connecting hole that matches the L-shaped groove of the straightening protrusion. The end sleeve (3) has an arc-shaped structure with a dovetail groove and an L-shaped step on the inner side. A connecting hole is provided on one side wall of the L-shaped step. The straightening protrusion of the straightening body (1) is spliced ​​with the connecting sleeve (2), the connecting sleeve (2) with each other, or the connecting sleeve (2) with the end sleeve (3) through the cooperation of the dovetail boss and the dovetail groove. After positioning by the L-shaped step, the spliced ​​structure is fixed by screwing the locking screw (4) into the connecting hole.

2. The adaptive adjusting straightener according to claim 1, characterized in that, Both the connecting sleeve (2) and the end sleeve (3) are arc-shaped structures with concentric straightening protrusions on the body of the straightener.

3. The adaptive adjusting straightener according to claim 1, characterized in that, The mating surfaces of the dovetail bosses and dovetail grooves of the centralizer body (1), connecting sleeve (2) and end sleeve (3) are all provided with anti-slip textures.

4. The adaptive adjusting straightener according to claim 3, characterized in that, The anti-slip texture is a sawtooth or wave-shaped structure.

5. The adaptive adjusting straightener according to claim 1, characterized in that, At least two locking screws (4) are provided at each joint between the straightening ridge and the connecting sleeve (2), between the connecting sleeves (2) or between the connecting sleeve (2) and the end sleeve (3), and the locking screws are spaced apart along the length of the straightening ridge.

6. The adaptive adjusting straightener according to claim 5, characterized in that, The head of the locking screw (4) is provided with an anti-loosening washer.

7. The adaptive adjusting straightener according to claim 1, characterized in that, The radial thickness of the connecting sleeve (2) has various size specifications.

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