Anti-erosion tungsten carbide bushing for oil bit nozzle

Abstract

The utility model discloses a kind of tungsten carbide bushings of oil drill bit nozzle anti-erosion, including tungsten carbide inner lining is circular tubular structure, the outer wall of the both ends end face of tungsten carbide is provided with the flanging extending to the direction away from circle center;Soft metal layer sintering on the outer wall of the tungsten carbide inner lining and the outer wall of the tungsten carbide inner lining is completely covered, the inner wall of soft metal layer is provided with the locking structure corresponding with the tungsten carbide inner lining;Steel body interference fit at the outer wall of the soft metal layer, tungsten carbide flanging completely covers steel body end face, drilling fluid only contacts tungsten carbide, life is greatly improved, by adopting intermediate soft metal, tungsten carbide crack caused by hot installation process can be effectively prevented, also can effectively reduce in vibration process;By hot installation compression installation without welding, the integrity of steel body is guaranteed, by replacing inner lining and soft metal, replacement effect can be realized, without overall scrapping.

Description

Technical Field

[0001] This utility model relates to the field of oil drill bushing technology, and in particular to an anti-erosion tungsten carbide bushing for oil drill nozzles. Background Technology

[0002] Under conditions of high-frequency vibration (1000-3000Hz) and sand-containing drilling fluid scouring, existing oil drill bit nozzles have the following problems: most bushings are currently manufactured using a one-piece molding process to fit different drill bit mounting holes. Welding connections can lead to steel deformation, resulting in an assembly rate of less than 80%, making disassembly and repair difficult. Fretting wear is easily generated under high-frequency vibration conditions, and the bushing may move due to increased clearance, leading to scrapping. The difference in thermal expansion coefficients between tungsten carbide and steel is too large, resulting in thermal stress and vibration stress concentration, and a high rate of liner cracking. Traditional nozzle drilling fluid directly scouring the edge of the steel end face leads to edge hollowing. Therefore, there is an urgent need to solve the problem of a tungsten carbide bushing that is not easily eroded. Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings of the prior art and provide an anti-erosion tungsten carbide bushing for oil drill bit nozzles, a tungsten carbide bushing that can prevent drilling fluid from eroding the edge of the steel body.

[0004] The purpose of this utility model is achieved through the following technical solution: a tungsten carbide bushing for preventing erosion of an oil drill nozzle, wherein the tungsten carbide liner has a cylindrical structure, and flanges extending away from the center are provided on the outer walls of both end faces of the tungsten carbide; a soft metal layer is sintered on the outer wall of the tungsten carbide liner and completely covers the outer wall of the tungsten carbide liner, and a locking structure corresponding to the tungsten carbide liner is provided on the inner wall of the soft metal layer; a steel body is interference-fitted to the outer wall of the soft metal layer.

[0005] The present invention is further configured such that: the steel body includes a first steel body and a second steel body, and positioning platforms and sealing grooves are provided on the outer walls of both the first steel body and the second steel body.

[0006] The present invention is further configured such that: both the first steel body and the second steel body are connected to the soft metal layer, and both the inner walls of the first steel body and the second steel body are provided with internal threads near the C end.

[0007] The present invention is further configured such that: the first steel body and the second steel body are threadedly connected to each other, the inner wall of the first steel body is provided with an internal thread near end C, and the inner wall of the second steel body is provided with an external thread near end C.

[0008] The present invention is further configured such that: the first steel body and the second steel body are provided with an end face section, a transition section and an interlocking section in sequence from the end face away from C to the end face near C.

[0009] This utility model has the following beneficial effects: The tungsten carbide flange completely covers the steel end face, and the drilling fluid only comes into contact with the tungsten carbide, greatly extending its service life.

[0010] By using a soft metal in the middle, tungsten carbide cracks caused by hot installation can be effectively prevented, and vibration can also be effectively reduced. The hot-installation compression method eliminates the need for welding, ensuring the integrity of the steel body. Replacement can be achieved by replacing the lining and soft metal, without the need for complete scrapping. Attached Figure Description

[0011] Figure 1 This is an assembly drawing of an embodiment of this utility model; Figure 2 This is an embodiment of the present utility model. Figure 1 Cross-sectional view along line AA; Figure 3 This is a cross-sectional structural schematic diagram of the steel body in an embodiment of this utility model; Figure 4 This is a cross-sectional structural schematic diagram of the soft metal layer in an embodiment of this utility model; Figure 5 This is a cross-sectional structural schematic diagram of the tungsten carbide liner in an embodiment of this utility model.

[0012] In the picture: 1. Tungsten carbide liner; 11. Boss structure; 12. Flanged edge; 2. Steel body; 21. End face section; 22. Transition section; 23. Interlocking section; 24. Threaded section; 25. Positioning platform; 26. Sealing groove; 3. Soft metal layer; 31. Deformation groove; 32. Groove. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0014] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0015] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0016] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0017] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used 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. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0018] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] The following is in conjunction with the appendix Figure 1-4 The present invention will be described in further detail below, but the scope of protection of the present invention is not limited to the following description.

[0020] like Figure 1 As shown, an anti-erosion tungsten carbide bushing for an oil drill bit nozzle includes a tungsten carbide inner liner 1, a soft metal layer 3, and a steel body.

[0021] The tungsten carbide liner 1 has a cylindrical structure, and flanges 12 extending away from the center are provided on the outer walls of both end faces of the tungsten carbide.

[0022] like Figure 2 As shown, a boss structure 11 is provided on the outer wall of the tungsten carbide liner 1 along its axial direction.

[0023] The outer wall of the tungsten carbide liner 1 is provided with several uniformly spaced boss structures 11 along the circumferential direction.

[0024] As a preferred embodiment, the boss structure 11 is a strip structure with a rectangular cross-section.

[0025] The 15° flow guide chamfer is set at both ends of the flow channel opening of the inner wall of the tungsten carbide liner 1 to avoid local wear caused by eddy current scouring.

[0026] The soft metal layer 3 is sintered on the outer wall of the tungsten carbide liner 1 and completely covers the outer wall of the tungsten carbide liner 1. The inner wall of the soft metal layer 3 is provided with a locking structure corresponding to the tungsten carbide liner 1.

[0027] The locking structure is a groove structure that matches the boss structure 11, and the inner wall of the soft metal layer 3 is provided with a groove that matches the boss structure 11. 32 The inner wall of the soft metal layer 3 is uniformly provided with several evenly spaced grooves along its axial direction, which match the above-mentioned boss structure 11, and can resist axial and circumferential movement and reduce the impact of vibration.

[0028] Several deformation grooves 31 are provided on the outer wall of the soft metal layer 3, and the deformation grooves 31 are reserved for deformation.

[0029] In this scheme, the soft metal layer 3 can be a copper-based alloy, with the copper alloy as the intermediate layer. The thermal expansion coefficient of copper is , the thermal expansion coefficient of tungsten carbide is , and the thermal expansion coefficient of steel is , reducing the crack rate of the lining from 40% to 0.

[0030] The steel body 2 is interference-fitted to the outer wall of the soft metal layer 3.

[0031] The steel body 2 includes a first steel body and a second steel body. The outer walls of the first steel body and the second steel body are provided with a positioning platform 25 and a sealing groove 26. The positioning platform 25 is located 5cm away from the A end face, and the sealing groove 26 is located 10cm away from the A end face.

[0032] The lengths of both the first and second steel bodies are 39.9 cm.

[0033] The first and second steel bodies have identical and symmetrical structures.

[0034] The inner wall of the steel body consists of an end face section 21, a transition section 22, an interlocking section 23, and a threaded section 24. The inner diameters of the four sections are 25.1cm, 25.1cm-27.9cm, 27.9cm, and 27.9cm, respectively. The inner diameter of the steel body is one millimeter smaller than the outer diameter of the soft metal layer 3. An interference fit is formed by a one-millimeter allowance. The assembly effect can be achieved by either hot fitting or cold fitting.

[0035] Both the first steel body and the second steel body are connected to the soft metal layer 3, and internal threads are provided on the inner walls of both the first steel body and the second steel body near end C.

[0036] Preferably, the first steel body and the second steel body are threadedly connected to each other, with an internal thread on the inner wall of the first steel body near end C and an external thread on the inner wall of the second steel body near end C.

[0037] In this embodiment, a chamfer is also provided on the outer wall of the C end face of the steel body 2.

[0038] In this embodiment, the steel body 2 can be hydraulically pressed, and then the C-end faces of the first and second steel bodies can be treated, such as by brazing, to improve the torsional resistance.

[0039] The tungsten carbide flange 12 completely covers the steel body end face, and the drilling fluid only comes into contact with the tungsten carbide, which greatly improves the service life.

[0040] By using a soft metal in the middle, tungsten carbide cracks caused by hot installation can be effectively prevented, and vibration can also be effectively reduced. The hot-installation compression method eliminates the need for welding, ensuring the integrity of the steel body. Replacement can be achieved by replacing the lining and soft metal, without the need for complete scrapping.

[0041] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A tungsten carbide bushing for preventing erosion of oil drill bit nozzles, characterized in that: The tungsten carbide liner (1) has a cylindrical structure, and the outer walls of the two end faces of the tungsten carbide are provided with flanges (12) extending away from the center. A soft metal layer (3) is sintered on the outer wall of the tungsten carbide liner (1) and completely covers the outer wall of the tungsten carbide liner (1). A locking structure corresponding to the tungsten carbide liner (1) is provided on the inner wall of the soft metal layer (3). The steel body (2) is interference-fitted to the outer wall of the soft metal layer (3).

2. The erosion-resistant tungsten carbide bushing for an oil drill bit nozzle according to claim 1, characterized in that: The steel body (2) includes a first steel body and a second steel body, and both the first steel body and the second steel body are provided with a positioning platform (25) and a sealing groove (26) on their outer walls.

3. The erosion-resistant tungsten carbide bushing for an oil drill bit nozzle according to claim 2, characterized in that: Both the first steel body and the second steel body are connected to the soft metal layer (3), and the inner walls of the first steel body and the second steel body are provided with internal threads near the C end.

4. The erosion-resistant tungsten carbide bushing for an oil drill bit nozzle according to claim 2, characterized in that: The first steel body and the second steel body are threadedly connected to each other. The inner wall of the first steel body is provided with an internal thread near end C, and the inner wall of the second steel body is provided with an external thread near end C.

5. The erosion-resistant tungsten carbide bushing for an oil drill bit nozzle according to any one of claims 2-4, characterized in that: The first steel body and the second steel body are further provided with an end face section (21), a transition section (22) and an interlocking section (23) from the end face away from C to the end face near C.

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