Stator and rotary guiding system

Abstract

The utility model discloses a stator and a rotary guiding system, and relates to the technical field of machining. The stator provided by the utility model is provided with the flow channel, the inner wall of the flow channel is provided with the insertion pipe, and the insertion pipe is made of any one of a tungsten carbide alloy, a titanium carbide alloy, a titanium carbonitride alloy and a tungsten-titanium alloy. The rotary steering system provided by the utility model comprises the stator. The inner wall of the stator runner is provided with the insertion pipe, and the insertion pipe is made of any one of the tungsten carbide alloy, the titanium carbide alloy, the titanium carbonitride alloy and the tungsten-titanium alloy, so that the hardness and the wear resistance of the working surface of the stator runner are improved; the runner of the stator can effectively cope with erosion of high-pressure drilling fluid in the oil and gas drilling industry, and therefore the service life of the stator is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of machining, and particularly to a stator and a rotary steering system. Background Art

[0002] The machining of the stator realizes the required shape, size and surface quality through mechanical techniques (such as turning, milling, etc.). According to different application scenarios, the requirements for the stator will vary. For example, in the oil and gas drilling industry, the stator must meet certain performance standards to ensure reliability and durability under extreme conditions.

[0003] Specifically, in the oil and gas drilling industry, the downhole operating environment usually has characteristics such as high pressure difference, strong scouring, large wear and strong corrosion. However, the base material of the stator body is usually an ordinary steel part, and the wear resistance of the flow channel working surface far cannot meet the requirements of the harsh downhole operating environment. In order to improve the wear resistance, corrosion resistance and impact resistance of the flow channel working surface of the stator, the prior art generally adopts the HVOF (High Velocity Oxy-Fuel) supersonic spraying technology on the inner wall of the stator flow channel, that is, spraying a hard surface layer on the inner wall surface of the stator flow channel. However, since the hard surface layer formed by the HVOF supersonic spraying technology is relatively thin, has poor wear resistance, and the bonding strength between the hard surface layer and the inner wall of the stator flow channel is poor, it is not enough to resist the high pressure difference scouring downhole, resulting in a short service life of the stator.

[0004] Therefore, how to obtain a stator with better wear resistance and impact resistance to be able to resist the high pressure difference impact downhole is a technical problem that those skilled in the art urgently need to solve. Utility Model Content

[0005] To solve the above technical problems, the purpose of the present utility model is to provide a stator with better wear resistance and impact resistance and a rotary steering system including the stator.

[0006] The technical solution provided by the present utility model is as follows:

[0007] A stator is provided with a flow channel, and an insertion pipe is installed on the inner wall of the flow channel. The material of the insertion pipe is any one of tungsten carbide alloy, titanium carbide alloy, titanium carbonitride alloy and tungsten titanium alloy.

[0008] Further, the material of the insertion pipe is tungsten carbide alloy.

[0009] Further, the insertion pipe is arranged at the inlet position of the inner wall of the flow channel.

[0010] Further, the cross section of the insertion pipe is circular or elliptical.

[0011] Further, the insertion pipe is in the shape of a cylindrical straight tube.

[0012] Further, the outer wall of the insertion pipe is stepped along its axial direction, including a first section and a second section, and the outer diameter of the first section is greater than that of the second section.

[0013] Further, the insertion pipe and the inner wall of the flow channel are tightly connected by a connection method of hot fitting, gluing or welding.

[0014] Further, the insertion pipe and the inner wall of the flow channel are tightly connected by a connection method of mechanical locking.

[0015] Further, the axial length range of the insertion pipe is 10 mm - 50 mm.

[0016] On the other hand, the present utility model also provides a rotary steering system, including the stator described in any one of the above embodiments.

[0017] Compared with the prior art, the stator provided by the embodiment of the present utility model at least has the following technical effects:

[0018] By installing an insertion pipe on the inner wall of the stator flow channel, and the material of the insertion pipe is any one of tungsten carbide alloy, titanium carbide alloy, titanium carbonitride alloy and tungsten titanium alloy, the hardness and wear resistance of the working surface of the stator flow channel are improved, so that the flow channel of the stator can effectively cope with the erosion of high-pressure drilling fluid in the oil and gas drilling industry, thereby improving the service life of the stator.

[0019] The rotary steering system includes the stator in the above embodiment, so it at least has the technical effects corresponding to the stator in the above embodiment, which will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present application. 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 cross-sectional structure diagram of a stator in the prior art;

[0022] Figure 2 It is a schematic top view structure diagram of the stator in the embodiment of the present utility model;

[0023] Figure 3 It is a schematic cross-sectional structure diagram of the stator in the embodiment of the present utility model;

[0024] Figure 4 is Figure 3Schematic structural diagram of the inserted pipe

[0025] Figure 5 Schematic cross-sectional structure diagram of the stator in another embodiment of the present utility model

[0026] Figure 6 is Figure 5 Schematic structural diagram of the inserted pipe

[0027] 10. Stator; 101. Flow channel; 1011. Inlet; 102. Inserted pipe; 1021. First section; 1022. Second section; 103. Hard surface layer Specific implementation manners

[0028] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the scope of protection of this application

[0029] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly disposed on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element

[0030] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to this application

[0031] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, the meaning of "a plurality" and "several" is two or more, unless otherwise specifically defined

[0032] It should be noted that the structures, proportions, sizes, etc. shown in the attached drawings of this specification are only used to match the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the implementation conditions of this application. Therefore, they do not have substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the efficacy that this application can produce and the purpose that can be achieved, should still fall within the scope covered by the technical content disclosed in this application.

[0033] In the oil and gas drilling industry, as an important tool to improve drilling efficiency and accuracy, the performance of the core component of the rotary steerable system (RSS), the stator for rotary steering, directly affects the stability and reliability of the entire drilling process.

[0034] The stator for rotary steering is located inside the drill pipe, adjacent to key components such as the logging while drilling (LWD), measurement while drilling (MWD), bearings (such as TC and PDC bearings), and offset mechanisms (such as PAD push-off offset mechanisms). The stator, in cooperation with the rotary steering tool (PD-Orbit) and the high-torque power sub assembly (positive displacement motor PDM), can effectively convert the hydraulic kinetic energy of the mud into mechanical kinetic energy. Among them, the stator is mainly used for discharging and relieving pressure and transmitting the flow of high-speed downhole drilling fluid. Therefore, it is required to have properties such as high wear resistance and high erosion resistance.

[0035] However, the matrix material of the stator body is usually ordinary steel parts, and the wear resistance of the flow channel working surface far cannot meet the requirements of the harsh downhole working environment. To improve the wear resistance, corrosion resistance, and impact resistance of the flow channel working surface of this stator, please refer to the attached Figure 1 As shown, in the prior art, generally, the high-velocity oxy-fuel (HVOF) thermal spraying technology is used on the inner wall of the flow channel 101 of the stator 10, that is, a hard surface layer 103 is sprayed on the inner wall surface of the flow channel 101 of the stator 10. However, since the hard surface layer 103 formed by using the HVOF thermal spraying technology is relatively thin, has poor wear resistance, and the bonding strength between the hard surface layer 103 and the inner wall of the flow channel 101 of the stator 10 is poor, it is not sufficient to resist the high-pressure differential erosion downhole, resulting in a short service life of the stator 10.

[0036] In addition, in industries such as oil and gas drilling and chemical pump valves, the working environment usually has characteristics such as high pressure differential, strong erosion, large wear, and strong corrosion. This makes the design of downhole key parts face problems of short life and frequent replacement, resulting in reduced drilling efficiency and increased carbon emissions during the drilling operation process.

[0037] Therefore, how to improve the wear resistance and impact resistance of the stator 10, extend the service life of the stator 10, reduce the downtime replacement frequency, enhance the overall reliability and efficiency of the drilling tool, and reduce the carbon emissions during the downtime replacement frequency and operation process of the drilling operation are technical problems that need to be urgently solved by those skilled in the art.

[0038] Based on the above technical problems, please refer to the attached Figure 2 and the attached Figure 3 As shown, an embodiment of the present invention provides a stator 10. The stator 10 is provided with a flow channel 101, and an insertion pipe 102 is installed on the inner wall of the flow channel 101. The material of the insertion pipe 102 is cemented carbide, specifically any one of tungsten carbide alloy, titanium carbide alloy, titanium carbonitride alloy, and tungsten titanium alloy. Among them, the number of the flow channels 101 is not specifically limited here and can be multiple. In a specific example, the stator 10 is provided with 3 flow channels 101, and the 3 flow channels 101 are arranged at intervals. An insertion pipe 102 is installed on the inner wall of each flow channel 101, and the material of each insertion pipe 102 is cemented carbide. Among them, cemented carbide is a material with excellent wear resistance and corrosion resistance, which can withstand high temperature and high pressure environments and is suitable for demanding industrial applications. Therefore, the stator 10 provided in this embodiment is applicable to the oil and gas drilling industry. During the downhole operation process, the drilling fluid passes through the 3 flow channels 101, and the insertion pipes 102 made of cemented carbide installed in the flow channels 101 can effectively cope with the erosion of the high-pressure drilling fluid in the oil and gas drilling industry, avoid the formation of vortex fluids after the flow channels 101 in the stator 10 are eroded, and prevent the aperture of the flow channels 101 from expanding due to continuous erosion, resulting in the failure of the stator 10.

[0039] Under complex and harsh working conditions, the installation of the insertion pipe 102 on the inner wall of the flow channel 101 of the stator 10, and the material of the insertion pipe 102 being any one of tungsten carbide alloy, titanium carbide alloy, titanium carbonitride alloy, and tungsten titanium alloy, improve the hardness and wear resistance of the working surface of the flow channel 101 of the stator 10, enabling the flow channel 101 of the stator 10 to effectively cope with the erosion of the high-pressure drilling fluid in the oil and gas drilling industry, thereby extending the service life of the stator 10.

[0040] In some alternative embodiments, the material of the inserted pipe 102 is tungsten carbide alloy. Among them, the hardness of the tungsten carbide alloy material is ≥1800HV (nearly three times higher than that of the HVOF (High Velocity Oxygen Fuel) spraying technology), and it has good wear resistance and high strength. Through experimental tests, under the same downhole working conditions, the stator 10 with the inserted pipe 102 made of tungsten carbide alloy installed on the inner wall of the flow channel 101 can be continuously used for 400 hours with almost no wear. Specifically, for the inserted pipe 102 made of tungsten carbide alloy, it has good porosity and can achieve "A02 B00 C00" (porosity refers to the proportion of internal pores in the material and is usually used to measure the density of the material. Here, "A02 B00 C00" is a grading standard, and its specific meaning depends on a specific industry or testing standard. A02 represents the grade of porosity, usually indicating a low porosity and good material density. B00 represents the surface defect or surface quality grade of the material, and B00 usually means no obvious surface defects. C00 represents other relevant performance indicators, and C00 usually means that the material meets the standard or ideal state in other aspects (such as chemical composition, physical properties, etc.)). Its hardness HV (Vickers Hardness) ≥1800, and the density is 13g / cm³ - 15g / cm³. However, for the stator 10 with the HVOF spraying technology on the inner wall of the flow channel 101, due to the thin coating thickness (about 0.1 - 0.25mm), low hardness (about 500 - 700HV), poor porosity (not meeting the standard requirement of porosity ≤1%), and poor bonding force of the hard surface layer 103, it is extremely easy to be washed by the high-speed drilling fluid to cracks, chipping, and missing during the actual operation process, resulting in poor fatigue resistance and erosion resistance of the stator 10 product. Before working for 200 hours, the aperture is eroded and enlarged by 5 - 10mm, and finally the part fails. In summary, the stator 10 with the inserted pipe 102 made of tungsten carbide alloy installed on the inner wall of the flow channel 101 has better performance in all aspects than the stator 10 formed by the HVOF spraying technology in the flow channel 101, thus extending the service life of the stator 10.

[0041] In some alternative embodiments, the inserted pipe 102 is arranged at the position of the inlet 1011 on the inner wall of the flow channel 101. Generally, the stamping strength at the inlet 1011 of the flow channel 101 is greater than that at the outlet of the flow channel 101. Therefore, the inserted pipe 102 is preferentially arranged at the position of the inlet 1011 on the inner wall of the flow channel 101.

[0042] The cross-sectional shape and size of the inserted pipe 102 can be reasonably designed according to the shape and size of the flow channel 101 in the stator 10 and the corresponding downhole working conditions requirements, and no specific limitation is made here. In some specific embodiments, the cross-section of the inserted pipe 102 is, but not limited to, circular or elliptical.

[0043] Further, please refer to the attached Figure 3 and the attached Figure 4 As shown, in some embodiments, the insertion pipe 102 is in the shape of a cylindrical straight tube. Among them, the cylindrical straight tube-shaped insertion pipe 102 is easy to be docked and assembled with the inner wall of the flow channel 101.

[0044] In some other embodiments, please refer to the attached Figure 5 and the attached Figure 6 As shown, the outer wall of the insertion pipe 102 is stepped along its axial direction, including a first section 1021 and a second section 1022, and the outer diameter of the first section 1021 is larger than that of the second section 1022. It should be further noted that the first end is arranged at the end close to the inlet 1011 of the flow channel 101. In this embodiment, the setting that the first section 1021 is larger than the second section 1022 can form a better sealing effect when the insertion pipe 102 is connected to the inner wall of the flow channel 101, preventing the leakage of fluid (such as mud).

[0045] In some alternative embodiments, the insertion pipe 102 and the inner wall of the flow channel 101 are firmly connected by a connection method such as hot fitting, gluing or welding. Among them, the hot fitting connection utilizes the principle of thermal expansion. For example, the flow channel 101 is heated to a certain temperature to make it expand, and then the insertion pipe 102 is quickly inserted. When the flow channel 101 cools, its volume shrinks to form a tight fit, thereby effectively fixing the insertion pipe 102 in the flow channel 101. The glue connection is to fix the insertion pipe 102 and the inner wall of the flow channel 101 together with a high-performance adhesive.

[0046] In some other embodiments, the insertion pipe 102 and the inner wall of the flow channel 101 are firmly connected by a mechanical locking connection method. Among them, the mechanical locking connection usually involves specific connecting parts, such as bolts, nuts, clamps or latches, etc. These connecting parts physically fix the insertion pipe 102 firmly on the inner wall of the flow channel 101 to form a reliable mechanical connection. In this way, the tightness and stability of the connection can be ensured by applying appropriate torque during assembly.

[0047] The axial length of the insertion pipe 102 can be reasonably designed according to the depth of the flow channel 101 in the stator 10 and the corresponding downhole working conditions. In some specific embodiments, the axial length range of the insertion pipe 102 is 10 mm - 50 mm.

[0048] The stator 10 in the above embodiments can be used in industries such as oil and gas drilling and production, and chemical pump valves. In a specific embodiment, the stator 10 is used in the oil and gas drilling and production industry to form a rotary steerable system. The rotary steerable system includes the stator 10 in any one of the above embodiments. The rotary steerable system has the technical effects corresponding to the stator 10 in the above embodiments, such as enhanced wear resistance and erosion resistance, thereby improving the overall operation efficiency and reliability. Here, we will not elaborate on these technical effects in detail.

[0049] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A stator, characterized in that: A flow channel is provided, and a plug-in tube is installed on the inner wall of the flow channel. The plug-in tube is made of any one of tungsten carbide alloy, titanium carbide alloy, titanium carbonitride alloy and tungsten-titanium alloy.

2. The stator according to claim 1, characterized in that The material of the plug-in tube is tungsten carbide alloy.

3. The stator according to claim 1, characterized in that: The plug-in tube is arranged at an inlet position of the inner wall of the flow channel.

4. The stator according to claim 1, characterized in that The cross section of the plug-in tube is circular or elliptical.

5. The stator according to claim 1, characterized in that: The plug-in tube is in the shape of a cylindrical straight tube.

6. The stator according to claim 1, characterized in that The outer wall of the plug tube is stepped along its axial direction, and includes a first section and a second section, wherein the outer diameter of the first section is greater than the outer diameter of the second section.

7. The stator according to claim 1, characterized in that The plug-in tube is tightly connected to the inner wall of the flow channel by heat-fitting, gluing or welding.

8. The stator according to claim 1, characterized in that The plug-in tube is firmly connected to the inner wall of the flow channel by means of mechanical locking.

9. The stator according to claim 1, characterized in that: The length of the plug-in tube along its axial direction ranges from 10 mm to 50 mm.

10. A rotary steerable system, characterized in that: Comprising a stator as claimed in any one of claims 1 to 9.

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