A self-retaining sawtooth alloy tooth structure

Abstract

The utility model discloses a kind of self-prevent dropping sawtooth alloy tooth structure, including the continuous setting of multiple layers of alloy tooth body along axial direction, each layer alloy tooth body is sawtooth alloy tooth and the outer diameter of alloy tooth body is greater than the diameter of tooth hole, the sawtooth of adjacent layer alloy tooth body is staggered arrangement, by optimizing the layered structure arrangement of sawtooth alloy tooth sawtooth, in the process of inserting tooth, after being pressed into the tooth hole on stabilizer outer cylinder, the influence of effectively reducing surface solid tooth force slightly small and the vibration existing in well bottom can be reduced, alloy tooth body is avoided from tooth hole and easily falls off, and the use effect of screw drill is affected, effectively improve the wear resistance of stabilizer, improve the quality of wellbore construction, reduce production and maintenance cost, give full play to the economic value of screw drill.

Description

Technical Field

[0001] This utility model relates to the technical field of oil and gas drilling equipment. More specifically, this utility model relates to a self-preventing sawtooth-shaped alloy tooth structure. Background Technology

[0002] In oil and gas extraction, screw drills are increasingly widely used. Screw drills mainly consist of a motor assembly, universal joint housing, universal joint assembly, and drive shaft assembly. The drive shaft assembly housing contains a stabilizer with serrated alloy teeth on its outer cylindrical surface. During operation, these serrated alloy teeth wear against the wellbore, and the various components of the bottom hole drill are constantly vibrating during drilling, making them prone to detaching from the stabilizer's tooth holes. Furthermore, manufacturing errors result in inaccurate control of the retaining force between the tooth holes and the serrated alloy teeth; some teeth have high retaining forces, while others have low forces. During use, the serrated alloy teeth with lower retaining forces are more likely to detach from the tooth holes, causing the stabilizer diameter to wear down and reduce its size, thus affecting the screw drill's performance and reducing drilling efficiency.

[0003] Currently, the sawtooth alloy teeth have a monolithic structure, without segmentation or misalignment. Without altering the original tooth holes, when these sawtooth alloy teeth are pressed into the tooth holes on the outer cylinder of the stabilizer, they easily detach from the holes due to weak tooth-holding force and vibrations at the bottom of the well. This reduces the stabilizer's wear resistance, affects the performance of the screw drill at the bottom of the well, and causes the wellbore quality to fail to meet design requirements, negatively impacting subsequent wellbore use. Summary of the Invention

[0004] One object of this invention is to solve at least the problems described above and to provide at least the advantages that will be explained later.

[0005] Another objective of this invention is to provide a self-preventing sawtooth-shaped alloy tooth structure to solve the technical problem that the alloy tooth structure set on the stabilizer in the prior art is an integral structure and is prone to falling off from the tooth hole under vibration.

[0006] In order to achieve these objectives and other advantages of the present invention, a self-preventing sawtooth alloy tooth structure is provided, comprising a multi-layer alloy tooth body continuously arranged along the axial direction, each layer of alloy tooth body being a sawtooth alloy tooth and the outer diameter of the alloy tooth body being 0.1~0.3mm larger than the diameter of the tooth hole, and the sawtooths of adjacent layers of alloy tooth bodies being staggered.

[0007] Preferably, the alloy tooth body has 2-4 layers.

[0008] Preferably, except for the topmost layer, the top surface of each layer of the alloy tooth body is set as a plane or an inclined surface that is radially outward and downward.

[0009] Preferably, each layer of the alloy tooth body has a conical surface on its lower outer periphery that is radially inward and downward inclined.

[0010] Preferably, the generatrix direction of the saw teeth in each layer of the alloy tooth body is parallel to the axis, or has an angle with the axis radially. When there is an angle, the generatrix directions of the saw teeth in adjacent layers are not parallel.

[0011] Preferably, for the alloy teeth of adjacent layers, the axial projection of the serrations of the upper alloy teeth is located at the middle part of the axial projection of the serrations of the lower alloy teeth.

[0012] This utility model has at least the following beneficial effects: The self-preventing sawtooth alloy tooth structure of this utility model includes multiple layers of alloy teeth continuously arranged along the axial direction. Each layer of alloy teeth is a sawtooth alloy tooth with an outer diameter larger than the diameter of the tooth hole. The sawtooth teeth of adjacent layers of alloy teeth are staggered. By optimizing the layered structure arrangement of the sawtooth alloy teeth, during the tooth insertion process, after being pressed into the tooth hole on the outer cylinder of the stabilizer, the influence of insufficient surface tooth fixing force and vibration at the bottom of the well can be effectively reduced. This prevents the alloy teeth from easily falling out of the tooth hole and affecting the use effect of the screw drill bit, effectively improving the wear resistance of the stabilizer, improving the quality of wellbore construction, reducing production and maintenance costs, and fully realizing the economic value of the screw drill bit.

[0013] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0014] Figure 1 This is a front view of the self-preventing sawtooth-shaped alloy tooth structure of this utility model; Figure 2 This is a top view of the self-preventing sawtooth-shaped alloy tooth structure of this utility model, which has two layers of alloy teeth arranged along the axial direction. Figure 3 Corresponding to this utility model Figure 2 A top view of the lower alloy tooth body and the tooth hole mating structure; Figure 4 Corresponding to this utility model Figure 2 A top view of the upper alloy tooth body and the tooth hole mating structure.

[0015] The diagram in the instruction manual is labeled as follows: 1. Lower alloy tooth body, 2. Upper alloy tooth body, 3. Step. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0017] It should be noted that in the description of this utility model, the terms "horizontal", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] like Figure 1-4 As shown, this utility model provides a self-preventing sawtooth alloy tooth structure, including multiple layers of alloy teeth continuously arranged along the axial direction. Each layer of alloy teeth is a sawtooth alloy tooth and the outer diameter of the alloy tooth is larger than the diameter of the tooth hole by about 0.1~0.3mm. The radial tilt angle of the alloy tooth relative to the alloy tooth body is controlled within the range of 35-55°, and the sawtooths of adjacent layers of alloy teeth are staggered.

[0019] Unlike ordinary sawtooth alloy teeth, the overall structure is layered along the axial direction, with the sawtooth teeth of adjacent layers arranged at intervals. Taking a two-layer alloy tooth body as an example, after the lower sawtooth alloy tooth 1 is pressed into the tooth hole, the upper sawtooth alloy tooth 2 is pressed in. The upper alloy tooth 2 will squeeze and deform the base of the tooth hole, filling the gap between the sawtooth teeth of the upper alloy tooth 2, making the minimum diameter of the tooth hole of the upper part smaller, thus preventing the upper alloy tooth body from falling off. Moreover, the minimum diameter of the tooth hole of the upper part is smaller than the maximum outer diameter of the lower alloy tooth body 1, forming a barrier to prevent the sawtooth teeth of the lower alloy tooth from falling off outward, preventing the two layers of sawtooth alloy teeth from falling off the tooth hole, which would result in the stabilizer being less wear-resistant.

[0020] Without altering the original tooth holes, by optimizing the layered structure of the sawtooth alloy teeth, the impact of insufficient surface tooth fixing force and vibration at the bottom of the well can be effectively reduced after the teeth are pressed into the tooth holes on the outer cylinder of the stabilizer during the tooth insertion process. This prevents the alloy teeth from easily falling out of the tooth holes and affecting the performance of the screw drill bit, effectively improving the wear resistance of the stabilizer, enhancing the quality of wellbore construction, reducing production and maintenance costs, and fully realizing the economic value of the screw drill bit.

[0021] In another technical solution, such as Figure 1-4As shown, the alloy tooth body has 2-4 layers. The matrix of each corresponding layer is deformed by sequential compression, reducing the minimum diameter of that layer and providing an anti-detachment effect for each alloy tooth body layer. Two layers are generally sufficient and have the simplest structure. For example, the total height of the alloy tooth body is 10mm, with two layers, each 5mm high. The height of the outer end of the alloy tooth body is slightly higher than the outer circle of the stabilizer, with the excess generally controlled within 0-0.5mm.

[0022] In another technical solution, such as Figure 1-4 As shown, except for the top layer, the top surface of each layer of alloy teeth is set as a plane or an inclined plane that is radially outward and downward, with adjacent layers abutting and cooperating with each other. When set as an inclined plane, the inclination angle is within the range of 0-45°, and excessive inclination in a limited space is avoided as it would be detrimental to preventing them from falling off.

[0023] In another technical solution, such as Figure 1-4 As shown, each layer of the alloy tooth body has a conical surface on its lower outer periphery that is radially inward and downward inclined, which facilitates pressing into the tooth hole.

[0024] In another technical solution, such as Figure 1-4 As shown, the generatrix direction of the serrations in each layer of the alloy tooth body is parallel to the axis, or has a small radial angle of 0-10° with the axis. Too large an angle makes it difficult to press the alloy teeth in. When there is an angle, the generatrix directions of the serrations in adjacent layers are not parallel. That is, the serrations are oblique, and the oblique directions of adjacent layers are opposite; or one layer is oblique, and the serrations of adjacent layers are axial.

[0025] In another technical solution, such as Figure 1-4 As shown, for the alloy teeth of adjacent layers, the axial projection of the saw teeth of the upper alloy teeth is located in the middle of the axial projection of the saw teeth of the lower alloy teeth.

[0026] The following provides a serrated alloy tooth structure with a self-preventing-fall-off function, combined with Figure 1-4 As shown, the overall structure is layered along the axial direction, with the serrations of adjacent layers arranged in a cross pattern. The upper surface of the lower layer 1 of the serrated alloy teeth has a planar step 3. After the serrated alloy teeth 1a of the lower layer 1 are pressed into the tooth hole, the serrated alloy teeth 2a of the upper layer 2 are pressed in. The alloy teeth 2a of the upper layer 2 will compress and deform the base of the tooth hole, filling the gap 2b between the serrations of the alloy teeth of the upper layer 2. This makes the minimum diameter of the tooth hole in the upper layer smaller, preventing the upper layer 2 from falling out of the tooth hole. It is also smaller than the maximum outer diameter of the alloy teeth 1a of the lower layer 1, forming a barrier that prevents the serrated alloy teeth 1a of the lower layer 1 from falling outward, thus preventing the entire serrated alloy teeth from falling out of the tooth hole and causing the stabilizer to become less wear-resistant.

[0027] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A self-preventing sawtooth-shaped alloy tooth structure, characterized in that, It includes a multi-layered alloy tooth body continuously arranged along the axial direction. Each layer of alloy tooth body is a sawtooth alloy tooth and the outer diameter of the alloy tooth body is 0.1~0.3mm larger than the diameter of the tooth hole. The sawtooths of adjacent alloy tooth bodies are staggered.

2. The self-preventing sawtooth-shaped alloy tooth structure as described in claim 1, characterized in that, The alloy tooth body has 2-4 layers.

3. The self-preventing sawtooth-shaped alloy tooth structure as described in claim 1, characterized in that, Except for the topmost layer, the top surface of each layer of the alloy tooth body is set as a plane or an inclined surface that is radially outward and downward.

4. The self-preventing sawtooth-shaped alloy tooth structure as described in claim 1, characterized in that, Each layer of the alloy tooth body has a conical surface on its lower outer periphery that is radially inward and downward inclined.

5. The self-preventing sawtooth-shaped alloy tooth structure as described in claim 1, characterized in that, The generatrix direction of the saw teeth in each layer of the alloy tooth body is parallel to the axis, or has an angle with the axis radially. When there is an angle, the generatrix directions of the saw teeth in adjacent layers are not parallel.

6. The self-preventing sawtooth-shaped alloy tooth structure as described in claim 1, characterized in that, For the alloy teeth of adjacent layers, the axial projection of the saw teeth of the upper alloy teeth is located at the middle part of the axial projection of the saw teeth of the lower alloy teeth.

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