Method for welding wear-resistant element on wear-resistant belt of drilling tool stabilizer and drilling tool stabilizer

Abstract

The invention discloses a method for welding a wear-resistant element on a wear-resistant belt of a drilling tool stabilizer and the drilling tool stabilizer, and the method comprises the following steps: S1, manufacturing the wear-resistant element; s2, a drilling tool stabilizer is prepared, a hole is drilled in a wear-resistant belt of the drilling tool stabilizer, mounting holes distributed in an array mode are formed, and at least part of the structure of each wear-resistant element is embedded into each drilled mounting hole; s3, at least welding and filling the gap between the mounting hole and the wear-resistant element with transition type alloy powder; s4, welding and filling the wear-resistant belt with enhanced alloy powder, and covering the transition type alloy powder and the whole wear-resistant belt; and S5, after the wear-resistant belt is heated, heat preservation is conducted, then annealing cooling is conducted, so that the wear resistance and firmness of the wear-resistant element can be improved, and the service life of the wear-resistant element is prolonged.

Description

Technical Field

[0001] This invention relates to the field of drill stabilizer technology, and in particular to a method for welding wear-resistant elements into a wear-resistant strip of a drill stabilizer, and a drill stabilizer itself. Background Technology

[0002] Most existing stabilizer wear-resistant band welded carbide blocks on the market are produced using manual arc welding or oxy-acetylene flame welding. The welding process generates high temperatures, and the placement of the blocks needs to be adjusted repeatedly, increasing the heat input time. Whether cobalt-based or nickel-based, prolonged exposure to high temperatures causes the carbide blocks to form a cobalt-depleted softening layer or brittle phase precipitation, reducing their hardness and wear resistance. Furthermore, the tungsten carbide in the blocks oxidizes and becomes brittle, significantly reducing the lifespan of the stabilizer wear-resistant band. In addition, different materials in the stabilizer wear-resistant band result in different coefficients of thermal expansion. The significant difference in expansion and contraction during welding leads to extreme shear stress at the weld interface, causing cracks at the bottom weld or in the alloy itself. The square corners of the carbide blocks are prone to stress concentration, which is one source of cracks.

[0003] Furthermore, the existing alloy block has too much clearance above the stabilizer's wear-resistant strip. This causes incomplete melting of the alloy powder at the bottom, resulting in incomplete fusion defects. Consequently, the alloy block does not adhere firmly to the stabilizer's wear-resistant strip, ultimately leading to the alloy block detaching. This is especially true for non-magnetic stabilizer wear-resistant strips, where poor adhesion to the welding powder can easily cause the alloy block to detach directly from the stabilizer's wear-resistant strip. Summary of the Invention

[0004] The purpose of this invention is to provide a method for welding wear-resistant elements into a wear-resistant strip of a drill stabilizer and a drill stabilizer in order to solve the problems existing in the prior art, increase the wear resistance and robustness of the wear-resistant elements, and extend their service life.

[0005] To achieve the above objectives, the present invention provides the following solution: The present invention provides a method for welding wear-resistant elements into a wear-resistant strip of a drill bit stabilizer, comprising the following steps: S1. Manufacturing wear-resistant components; S2. Prepare the drill stabilizer, drill holes in the wear-resistant band of the drill stabilizer, and form an array of mounting holes, and insert at least a portion of the structure of each wear-resistant element into each of the mounting holes after drilling; S3. At least in the gap between the mounting hole and the wear-resistant element, a transitional alloy powder is welded and filled. S4. Weld reinforcing alloy powder onto the wear-resistant belt and cover the transition alloy powder and the entire wear-resistant belt; S5. The wear-resistant belt is heated and kept at that temperature, then annealed and cooled.

[0006] Optionally, the wear-resistant element prepared in step S1 has a cylindrical structure.

[0007] Optionally, in step S1, at least the outer peripheral wall of the portion of the wear-resistant element that is inserted into the mounting hole is arranged with prism structures in a circumferential array, with adjacent prism structures spaced apart, and the prism structures extending along the axial direction of the wear-resistant element.

[0008] Optionally, the depth of the mounting hole is at least half the height of the wear-resistant element.

[0009] Optionally, the wear-resistant element prepared in step S1 has a structure larger than the mounting hole, and in step S2, the wear-resistant element is inserted into the drilled mounting hole and is interference-fitted with the mounting hole.

[0010] Optionally, the filling height of the reinforced alloy powder is at least more than half the filling height of the transition alloy powder.

[0011] Optionally, the transition alloy powder is a nickel-based alloy powder, and the reinforcing alloy powder is a nickel-based alloy powder containing tungsten carbide.

[0012] Optionally, the tungsten carbide content in the reinforced alloy powder is 30%-60% of its total content.

[0013] Optionally, in step S5, the wear-resistant belt is heated to 450°C within 20 minutes using a heating furnace, and then the wear-resistant belt is kept at that temperature for 2 hours. Subsequently, the wear-resistant belt is placed in the heating furnace and cooled to room temperature in stages over 6 hours.

[0014] A drill string stabilizer prepared by the method described above for welding wear-resistant elements into the wear-resistant strip of a drill string stabilizer is also provided, characterized in that it comprises: The drill stabilizer body has multiple spiral wear-resistant bands, each of which is evenly distributed along the circumference of the drill stabilizer body. The wear-resistant bands are arrayed with mounting holes, and wear-resistant elements are embedded in the mounting holes. A transitional alloy powder layer, which at least fills the gap between the mounting hole and the wear-resistant element; An enhanced alloy powder layer covers the side of the transition alloy powder layer opposite to the wear-resistant band and covers the entire wear-resistant band.

[0015] The present invention achieves the following technical effects compared to the prior art: This invention discloses a method for welding wear-resistant elements into the wear-resistant band of a drill bit stabilizer. After inserting the wear-resistant element into the mounting hole, a transitional alloy powder is first welded and filled at least in the gap between the wear-resistant band and the wear-resistant element. A portion of the transitional alloy powder penetrates into the gap between the wear-resistant element and the mounting hole to firmly weld the wear-resistant element to the mounting hole. Then, reinforcing alloy powder is welded and filled onto the wear-resistant band, covering the transitional alloy powder and the entire wear-resistant band. This further increases the wear resistance and robustness of the wear-resistant element and extends its service life. This method solves the problems of existing technologies, such as purely embedded alloy columns being unwearable and unable to be repaired after wear, and welded alloy blocks being prone to cracking due to high stress, poor integration with the wear-resistant band of the drill bit stabilizer, weak welding, and easy detachment. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of a drill stabilizer in one example disclosed in this invention; Figure 2 for Figure 1 Sectional view at point AA; Figure 3 for Figure 2 Enlarged view of point B in the middle; Figure 4 This is a schematic diagram of the overall structure of a wear-resistant element in an example disclosed in this invention; Among them, 1-drill stabilizer body, 2-wear-resistant belt, 3-wear-resistant element, 4-transitional alloy powder layer, 5-reinforced alloy powder layer, 6-prism structure. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] The purpose of this invention is to provide a method for welding wear-resistant elements into a wear-resistant strip of a drill stabilizer and a drill stabilizer in order to solve the problems existing in the prior art, increase the wear resistance and robustness of the wear-resistant elements, and extend their service life.

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] like Figures 1 to 4 As shown, the present invention provides a method for welding wear-resistant elements into a wear-resistant strip of a drill bit stabilizer, comprising the following steps: S1. Fabricate wear-resistant component 3; it adopts a cemented carbide structure, usually tungsten carbide (WC) based cemented carbide, such as cast tungsten carbide or sintered tungsten carbide (cobalt-based cemented carbide), but is not limited to the above-mentioned cemented carbide structure. S2. Prepare the drill stabilizer, drill holes in the wear-resistant band 2 of the drill stabilizer to form an array of mounting holes, and insert at least part of the structure of each wear-resistant element 3 into each mounting hole after drilling; wherein, in order to ensure the uniformity of the setting of the wear-resistant elements 3 and thereby improve the wear resistance of the entire wear-resistant band 2, the wear-resistant band 2 is milled before drilling the wear-resistant band 2. S3. At least the gap between the mounting hole and the wear-resistant element 3 is filled with transition alloy powder by welding; S4. Weld reinforcing alloy powder onto the wear-resistant belt 2 and cover it with transition alloy powder and the entire wear-resistant belt 2. S5. Heat the wear-resistant belt 2 and keep it at that temperature, then anneal and cool it.

[0022] This invention discloses a method for welding wear-resistant elements 3 into the wear-resistant band 2 of a drill bit stabilizer. After inserting the wear-resistant element 3 into the mounting hole, a transitional alloy powder is first welded and filled at least in the gap between the wear-resistant band 2 and the wear-resistant element 3. A portion of the transitional alloy powder penetrates into the gap between the wear-resistant element 3 and the mounting hole to firmly weld the wear-resistant element 3 to the mounting hole. Then, reinforcing alloy powder is welded and filled onto the wear-resistant band 2, covering the transitional alloy powder and the entire wear-resistant band 2. This further increases the wear resistance and firmness of the wear-resistant element 3 and extends its service life. This method solves the problems of existing technologies, such as pure embedded alloy columns being unwearable and unable to be repaired after wear, and welded alloy blocks being prone to cracking due to high stress, poor integration with the wear-resistant band 2 of the drill bit stabilizer, weak welding, and easy detachment.

[0023] It should be further explained that after the entire wear-resistant belt 2 is welded, its surface is uneven. After annealing and cooling, a special grinding machine will be used to grind the entire wear-resistant belt 2 to expose the wear-resistant element 3, and the dimensional tolerance of the wear-resistant belt 2 must be guaranteed.

[0024] Based on the above embodiments, for welding reinforced alloy powder and transition alloy powder, spray welding is preferred. It is flexible to operate, quick to form, can make the surface of wear-resistant band 2 more wear-resistant, and is not easy to fall off.

[0025] Furthermore, based on the above implementation method, in order to ensure uniform stress distribution across the entire wear-resistant belt 2, transitional alloy powder is first welded and filled onto the entire wear-resistant belt 2. Part of the transitional alloy powder is filled in the gap between the mounting hole and the wear-resistant element 3, while the remainder covers the areas of the wear-resistant belt 2 where no mounting hole is provided, thus forming a transitional alloy powder layer 4 on the entire surface of the wear-resistant belt 2. Then, reinforcing alloy powder is welded and filled onto the side of the transitional alloy powder layer 4 that is away from the wear-resistant belt 2, forming a reinforcing alloy powder layer 5.

[0026] To further prevent cracking and spalling during welding heating, in one embodiment, the wear-resistant element 3 prepared in step S1 is a cylindrical structure. Compared to the square alloy block in the prior art, the cylindrical structure exhibits less stress concentration during welding heating and cooling, thus preventing cracking and spalling and ensuring the integrity of the wear-resistant element 3. It is understood that the four corners of a square alloy block are stress concentration points, making it highly susceptible to cracking, while the smooth surface of a circular alloy cylinder results in a uniform stress distribution, preventing stress concentration and cracking.

[0027] In step S1, at least the outer peripheral wall of the portion of the wear-resistant element 3 embedded in the mounting hole is circumferentially arrayed with prism structures 6. Adjacent prism structures 6 are spaced apart, and the prism structures 6 extend along the axial direction of the wear-resistant element 3. By creating prism structures 6 on the surface of the wear-resistant element 3, the wear-resistant element 3 with prism structures 6 has better torsional resistance, which is beneficial for the rotation of the stabilizer. It also allows a gap to be left between the wear-resistant element 3 and the mounting hole. When filling with transition alloy powder, the molten transition alloy powder flows into the aforementioned gap, further improving the firmness between the wear-resistant element 3 and the mounting hole and the wear-resistant band 2.

[0028] In some cases, prism structures 6 are arranged circumferentially on the outer peripheral wall of the portion of the wear-resistant element that is inserted into the mounting hole. Depending on the density of the prism structures 6, for example, in some specific examples, the portion of the wear-resistant element inserted into the mounting hole is a cylindrical structure with an outer diameter of [missing information]. 10- 12, and with 18-20 prism structures 6.

[0029] In other cases, the height of the prism structure 6 is the same as the overall length of the wear-resistant element 3 along the axial direction. Since the part of the wear-resistant element 3 exposed outside the mounting hole is also provided with the prism structure 6, the bonding area between it and the transition alloy powder and the reinforcing alloy powder is increased, thereby increasing the bonding strength between the wear-resistant element 3 and the transition alloy powder and the reinforcing alloy powder.

[0030] In one embodiment, the depth of the mounting hole is at least half the height of the wear-resistant element 3, such that at least half of the structure of the wear-resistant element 3 is inserted into the mounting hole to further improve the wear resistance of the wear-resistant band 2.

[0031] Based on the above embodiments, a portion of the structure of the wear-resistant element 3 is inserted into the mounting hole, and the transition alloy powder and the reinforcing alloy powder are welded and filled on the surface of the wear-resistant belt 2 and in the gaps between each wear-resistant element 3.

[0032] To further enhance the bonding strength between the wear-resistant element 3 and the wear-resistant strip 2, the wear-resistant element 3 prepared in step S1 has a structure larger than the mounting hole. In step S2, the wear-resistant element 3 is inserted into the drilled mounting hole and is interference-fitted with the mounting hole.

[0033] In this case, the wear-resistant element 3 has a cylindrical structure, so the diameter of the mounting hole is smaller than that of the wear-resistant element 3, allowing the wear-resistant element 3 to be inserted into the mounting hole by external force and to have an interference fit with the mounting hole. For example, the wear-resistant element 3 is 0.3 + / - 0.1 mm smaller than the mounting hole.

[0034] Furthermore, based on the circumferential array of prism structures 6 on the outer peripheral wall of at least the portion into which the wear-resistant element 3 is inserted into the mounting hole, the prism structures 6 make it easier to insert the wear-resistant element 3 into the mounting hole and achieve an interference fit between the wear-resistant element 3 and the mounting hole.

[0035] To facilitate the insertion of the wear-resistant component 3 into the mounting hole, the prism structure 6 is a rounded prism.

[0036] Based on the above embodiments, in this invention, a dedicated hydraulic inserting machine is used to press the wear-resistant element 3 into the mounting hole.

[0037] In one embodiment, the filling height of the reinforcing alloy powder is at least more than half the filling height of the transition alloy powder to ensure the bonding strength between the reinforcing alloy powder and the transition alloy powder, thereby improving the wear resistance of the entire wear-resistant band 2.

[0038] In one embodiment, the transition alloy powder is a nickel-based alloy powder, and the reinforcing alloy powder is a nickel-based alloy powder containing tungsten carbide. The transition alloy powder, being a nickel-based alloy powder without tungsten carbide, forms a metallurgical bonding layer with the wear-resistant band 2 after welding and melting. The reinforcing alloy powder, containing tungsten carbide, is welded while the transition alloy powder is still red-hot. The two powder layers share a common molten layer, achieving the bonding purpose.

[0039] To ensure the bonding strength between the transition alloy powder and the reinforcing alloy powder, the tungsten carbide content in the reinforcing alloy powder is 30%-60% of its total content.

[0040] In one embodiment, in step S5, the wear-resistant belt 2 is heated to 450°C within 20 minutes using a heating furnace, and then the wear-resistant belt 2 is kept at that temperature for 2 hours. Subsequently, the wear-resistant belt 2 is placed in the heating furnace and cooled to room temperature in stages over 6 hours to achieve the effect of stress relief and crack prevention.

[0041] Furthermore, a drill bit stabilizer prepared by the method described above for welding wear-resistant elements 3 into the wear-resistant band 2 of the drill bit stabilizer is provided. The stabilizer is characterized by comprising a drill bit stabilizer body 1, a transitional alloy powder layer 4, and a reinforcing alloy powder layer 5. The drill bit stabilizer body 1 has multiple spiral-shaped wear-resistant bands 2, each band 2 being evenly spaced along the circumference of the body 1. The wear-resistant bands 2 have arrayed mounting holes, in which wear-resistant elements 3 are embedded. The transitional alloy powder layer 4 at least fills the gap between the mounting holes and the wear-resistant elements 3. The reinforcing alloy powder layer 5 covers the side of the transitional alloy powder layer 4 opposite to the wear-resistant bands 2 and covers the entire wear-resistant band 2.

[0042] Any adaptive changes made according to actual needs are within the scope of protection of this invention.

[0043] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0044] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A method for welding wear-resistant elements into a wear-resistant strip of a drill bit stabilizer, characterized in that, Includes the following steps: S1. Manufacturing wear-resistant components; S2. Prepare the drill stabilizer, drill holes in the wear-resistant band of the drill stabilizer, and form an array of mounting holes, and insert at least a portion of the structure of each wear-resistant element into each of the mounting holes after drilling; S3. At least in the gap between the mounting hole and the wear-resistant element, a transitional alloy powder is welded and filled. S4. Weld reinforcing alloy powder onto the wear-resistant belt and cover the transition alloy powder and the entire wear-resistant belt; S5. The wear-resistant belt is heated and kept at that temperature, then annealed and cooled.

2. The method for welding wear-resistant elements into the wear-resistant strip of a drill stabilizer according to claim 1, characterized in that, The wear-resistant element prepared in step S1 has a cylindrical structure.

3. The method for welding wear-resistant elements into the wear-resistant strip of the drill bit stabilizer according to claim 2, characterized in that, In step S1, at least the outer peripheral wall of the portion of the wear-resistant element that is inserted into the mounting hole is arranged with prism structures in a circumferential array, with adjacent prism structures spaced apart, and the prism structures extending along the axial direction of the wear-resistant element.

4. The method for welding wear-resistant elements into the wear-resistant strip of the drill bit stabilizer according to claim 1, characterized in that, The depth of the mounting hole is at least half the height of the wear-resistant element.

5. The method for welding wear-resistant elements into the wear-resistant strip of a drill stabilizer according to claim 1, characterized in that, The wear-resistant element prepared in step S1 has a structure larger than the mounting hole. In step S2, the wear-resistant element is inserted into the drilled mounting hole and is interference-fitted with the mounting hole.

6. The method for welding wear-resistant elements into the wear-resistant strip of a drill bit stabilizer according to claim 1, characterized in that, The filling height of the reinforced alloy powder is at least more than half the filling height of the transition alloy powder.

7. The method for welding wear-resistant elements into the wear-resistant strip of a drill bit stabilizer according to claim 6, characterized in that, The transition alloy powder is a nickel-based alloy powder, and the reinforcing alloy powder is a nickel-based alloy powder containing tungsten carbide.

8. The method for welding wear-resistant elements into the wear-resistant strip of a drill bit stabilizer according to claim 7, characterized in that, The tungsten carbide content in the reinforced alloy powder is 30%-60% of its total content.

9. The method for welding wear-resistant elements into the wear-resistant strip of a drill bit stabilizer according to claim 1, characterized in that, In step S5, the wear-resistant belt is heated to 450°C in a heating furnace within 20 minutes, and then kept at that temperature for 2 hours. Subsequently, the wear-resistant belt is placed in the heating furnace and cooled to room temperature in stages over 6 hours.

10. A drill string stabilizer prepared by welding wear-resistant elements into the wear-resistant strip of a drill string stabilizer as described in any one of claims 1 to 9, characterized in that, include: The drill stabilizer body has multiple spiral wear-resistant bands, each of which is evenly distributed along the circumference of the drill stabilizer body. The wear-resistant bands are arrayed with mounting holes, and wear-resistant elements are embedded in the mounting holes. A transitional alloy powder layer, which at least fills the gap between the mounting hole and the wear-resistant element; An enhanced alloy powder layer covers the side of the transition alloy powder layer opposite to the wear-resistant band and covers the entire wear-resistant band.

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