Super-temperature-resistant screw drill stator

Abstract

The invention belongs to the technical field of drilling tools for ultra-deep wells, and discloses an ultra-temperature-resistant screw drill stator which comprises a stator bushing and a stator shell, and the stator bushing is arranged in the stator shell and is a heat-conducting elastomer. According to the invention, the stator bushing adopts the super-heat-conducting elastomer, all the advantages of the original elastomer are maintained, the stator bushing also has excellent heat conductivity of metal, and the heat-conducting elastomer can really realize dynamic sealing under a super-high-temperature medium in a myriameter deep well. Under the actual use working condition of an oil field, the stator bush adopts the super-heat-conducting elastomer, heat can be quickly transferred into drilling fluid, the heat is brought to the ground surface through drilling fluid circulation, the drilling fluid serves as a cooling agent, the temperature of the stator bush is stabilized within a receivable range, the aging speed of the elastomer is slowed down, and the service life of the elastomer is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of ultra-deep well drilling tools, and in particular relates to a super-heat-resistant screw drilling tool stator. Background Art

[0002] PDM drill is a type of volumetric downhole power drill that uses drilling fluid as power to convert liquid pressure energy into mechanical energy. It consists of five major parts: a transmission shaft assembly, a motor assembly, a universal shaft assembly, an anti-drop assembly, and a bypass valve assembly. The performance of the screw drill mainly depends on the motor assembly, which consists of a stator and a rotor. The stator includes a stator bushing and a stator housing. The stator bushing is a layer of rubber injected on the inner wall of a steel pipe, and the inner hole of the rubber is a spiral with certain geometric parameters. The stator and the rotor mesh with each other through an interference fit, and a spiral sealing line and a sealing cavity are formed through a lead difference. As the drilling fluid drives the rotor to rotate in the stator, the sealing cavity moves along the axial direction to complete the energy conversion. Rubber is a key component for sealing and energy conversion, and it is also the weakest link of the screw drill. Its performance directly affects the overall quality of the screw drill. In particular, as the depth of the well increases and the bottom temperature increases, higher requirements are placed on the temperature resistance of rubber. Calculated based on an average temperature gradient of 1.8°C / meter, the bottom temperature of a 10,000-meter-deep well will exceed 200°C. Therefore, ultra-deep drilling urgently requires new heat-resistant screw drill bits. As rubber is a weak point, improving its heat resistance becomes the key to improving the temperature resistance grade of screw drill bits.

[0003] At present, the heat-resistant rubber used in oil fields is mainly based on the modification of hydrogenated nitrile rubber and fluororubber, which has the following problems: As rubber materials, these two matrices also have the common properties of polymer materials, namely, poor thermal conductors and dynamic heat generation caused by viscoelasticity. These common properties, plus the continuous frictional heat generated by the bushing, will cause local aging and cannot be used for a long time in ultra-deep wells. Summary of the invention

[0004] In view of the above problems, the present invention provides a super-heat-resistant screw drill stator, which adopts the following technical solutions:

[0005] A super-temperature-resistant screw drill stator comprises a stator bushing and a stator shell. The stator bushing is arranged inside the stator shell and is a heat-conducting elastomer.

[0006] Furthermore, the thermally conductive elastomer includes any one of a rubber powder composite and a rubber metal composite.

[0007] Furthermore, the rubber powder composite and the rubber metal composite both include rubber and a thermally conductive material, wherein the mass ratio of the rubber to the thermally conductive material is 0:1-1:3.

[0008] Furthermore, the rubber includes one or a combination of nitrile rubber, hydrogenated nitrile rubber, hydrogenated carboxylated nitrile rubber, fluorinated nitrile rubber, fluororubber, silicone rubber, and butyl rubber.

[0009] Furthermore, the thermally conductive material of the rubber powder composite is thermally conductive powder, and the thermally conductive powder includes one or a combination of nano metal powder, silicon powder, SiC, SiN, AlN, BN, graphene, diamond, and nano carbon tubes.

[0010] Furthermore, the thermally conductive material of the rubber-metal composite is a flexible mesh, and the flexible mesh includes one or more combinations of carbon fibers, heat pipes, and metal wires.

[0011] Furthermore, the rubber-metal composite comprises metal rubber.

[0012] Furthermore, the preparation method of the rubber powder composite comprises the following steps:

[0013] Organic modification of the surface of thermally conductive powder;

[0014] The modified thermally conductive powder and rubber are added into an internal mixer according to a set ratio to complete internal mixing with the rubber to obtain a rubber powder composite.

[0015] Furthermore, the surface of the thermally conductive powder is organically modified, comprising the following steps:

[0016] Add the thermal conductive powder into a grinder for grinding, and add a set amount of solvent to obtain a thermal conductive powder with uniform particles;

[0017] Adding a set amount of solvent to the thermally conductive powder with uniform particles, stirring with a stirrer to obtain a uniformly stirred powder solution;

[0018] Adding an organic modifier into the solution and stirring it with a stirrer to obtain a uniformly stirred organic modified solution;

[0019] Add the uniformly stirred organic modifier solution dropwise to the uniformly stirred powder solution, and stir evenly with a stirrer to obtain a mixed solution;

[0020] After heating the mixed solution for a set time, the mixed solution is centrifuged to obtain a modified thermally conductive powder; the modified thermally conductive powder is washed with a solvent to remove residual organic modifiers and other impurities; the washed thermally conductive powder is dried to obtain a thermally conductive powder with an organically modified surface.

[0021] Furthermore, the preparation method of the rubber-metal composite includes the following steps: cleaning the flexible mesh, drying it after cleaning, dip-coating the dried flexible mesh with an adhesive, drying and cleaning it again, and then combining the flexible mesh dipped with the adhesive with rubber to obtain the rubber-metal composite.

[0022] Furthermore, the organic modifier is a coupling agent or a surfactant.

[0023] Furthermore, the molding process of the metal rubber includes the following steps:

[0024] The metal wire is shaped by using a mold core, and the metal rubber is obtained after the metal wire is washed, wound, stretched, woven, molded and cleaned.

[0025] Beneficial effects of the present invention:

[0026] 1. The stator bushing of the present invention adopts super thermal conductive elastomer, which not only maintains all the advantages of the original elastomer, but also has the excellent thermal conductivity of metal. This thermal conductive elastomer can truly achieve dynamic sealing under ultra-high temperature media in a well 10,000 meters deep.

[0027] 2. Under the actual use conditions in the oil field, the stator bushing of the present invention adopts a superconducting elastomer, which can quickly transfer heat to the drilling fluid and bring the heat to the surface through the circulation of the drilling fluid. The drilling fluid acts as a coolant to stabilize the temperature of the stator bushing within an acceptable range, slow down the aging rate of the elastomer, and extend its service life.

[0028] Other features and advantages of the present invention will be described in the following description, and partly become obvious from the description, or be understood by implementing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A schematic cross-sectional view of a stator of a super-temperature-resistant screw drill according to an embodiment of the present invention is shown;

[0031] Figure 2 A schematic diagram showing the main process of organic modification of the surface of a thermally conductive powder according to an embodiment of the present invention is shown;

[0032] Figure 3 A detailed schematic diagram of the process of organically modifying the surface of a thermally conductive powder according to an embodiment of the present invention is shown.

[0033] In the figure: 1. stator bushing; 2. stator housing; 3. rubber; 4. thermal conductive material. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] It should be noted that the terms "first", "second", etc. in the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0036] First, let's briefly explain the heat conduction mechanism:

[0037] The thermal conductivity of rubber 3 also has an important impact on its own process performance, physical properties and energy-saving effects. The high thermal resistance of rubber 3 leads to long vulcanization time, large performance difference between the surface and internal parts of the product, high vulcanization energy consumption, high internal temperature of rubber 3 products, reduced service life and safety performance, and excessively high temperature will also cause vulcanization to revert.

[0038] Heat conduction refers to the transfer of heat between parts of an object with different temperatures or between two objects with different temperatures, by the thermal motion of microscopic particles such as molecules, atoms and free electrons, without macroscopic relative displacement. Thermal conductivity is a macroscopic manifestation of molecular microscopic motion.

[0039] As the relative molecular mass increases, the thermal conductivity increases and tends to a constant. For rubber 3, the thermal conductivity is independent of the relative molecular mass. After cross-linking of rubber 3, the thermal conductivity increases slightly but the increase is not large. This is because when the degree of cross-linking is not high, the physical bonds between the molecular chains are still the main form of action. The orientation of the molecular chain has a great influence on the thermal conductivity, so the thermal conductivity has obvious anisotropy. The morphological structure of rubber 3 has liquid characteristics, and the thermal conductivity decreases with the increase of temperature, but it has solid properties below the glass transition temperature. The thermal conductivity increases with the increase of temperature and reaches a maximum value at the glass transition temperature. Above the glass transition temperature, rubber 3 is in a highly elastic state, that is, partial liquid properties, the molecular chain segments can move freely, the volume expansion is large, the density and elastic wave transmission speed decrease rapidly, and the material constant volume specific heat increase is not large. The thermal conductivity decreases with the increase of temperature, but its change below the glass transition temperature is greater than that in the highly elastic state. This is related to the liquid properties of rubber 3, because the amplitude of change with temperature in the liquid is much smaller than that in the solid.

[0040] like Figure 1 As shown, the present invention provides a super-heat-resistant screw drill stator, which combines the respective advantages of metal and rubber 3. While the stator takes into account the respective advantages of metal and rubber 3, the metal structure used plays a certain protective role on the rubber 3, reducing the risk of failure of weak links. The super-heat-resistant screw drill stator proposed by the present invention adopts a thermally conductive elastomer as the stator bushing 1. Due to its excellent low heat generation and high thermal conductivity, it ensures that the internal temperature of the stator bushing 1 is always close to the drilling fluid temperature, solving the problem of local aging of ordinary single rubber 3 due to heat accumulation.

[0041] like Figure 1 As shown, a super-heat-resistant screw drill stator includes a stator bushing 1 and a stator shell 2. The stator bushing 1 is arranged inside the stator shell 2, and the outer side of the stator bushing 1 is connected to the stator shell 2. The inner hole of the stator bushing 1 has a continuous spiral surface. The stator bushing 1 is a thermally conductive elastomer, and the thermally conductive elastomer includes any one of a rubber 3 powder composite and a rubber 3 metal composite.

[0042] For example, the rubber 3 powder composite and the rubber 3 metal composite both include rubber 3 and thermally conductive material 4, wherein the mass ratio of rubber 3 to thermally conductive material 4 is 0:1-1:3, and rubber 3 and thermally conductive material 4 are uniformly combined by mechanical blending or adhesive.

[0043] For example, the rubber 3 refers to a temperature-resistant rubber 3, including but not limited to one or a combination of nitrile rubber 3, hydrogenated nitrile rubber 3, hydrogenated carboxylated nitrile rubber 3, fluorinated nitrile rubber 3, fluororubber, silicone, butyl rubber 3, etc.

[0044] The thermally conductive elastomer is a rubber 3 powder composite, and the thermally conductive material 4 is a thermally conductive powder, including but not limited to one or a combination of nano metal powder, silicon powder, SiC, SiN, AlN, BN, graphene, diamond, nano carbon tubes, etc.

[0045] The rubber 3 powder composite is obtained by introducing organic thermal conductive nano powder material with good thermal conductivity into the rubber 3 with excellent temperature resistance. By optimizing the mixing process, the nano powder and the rubber 3 are organically combined through physical or chemical bonds, and the superconductor forms a continuous network structure in the rubber 3, and finally a super thermally conductive composite elastomer is obtained.

[0046] For example, the thermally conductive elastomer is a rubber 3 metal composite, and the thermally conductive material 4 is a flexible mesh, including but not limited to one or more combinations of carbon fiber, heat pipe, and metal wire.

[0047] The rubber 3 metal composite is a macroscopic bonding of an elastomer with excellent temperature resistance and a thermal conductive network, which is equivalent to designing thermal conductive reinforcement ribs in the rubber 3.

[0048] For example, the rubber 3 metal composite includes the metal rubber 3 , in which the rubber 3 is partially or completely replaced by the metal rubber 3 , and the metal rubber 3 is a metal wire.

[0049] Metal rubber 3 is a homogeneous elastic porous material. It is formed by placing a certain mass of stretched, spiral metal wires in a stamping (or rolling) mold in an orderly manner using a certain process method, and then cold stamping. Its raw material is metal wire, which has both the inherent properties of the selected metal and the elasticity of rubber 3.

[0050] The present invention also provides a method for preparing a rubber 3 powder composite, comprising the following steps:

[0051] S1. Organically modify the surface of the thermally conductive powder, such as Figure 2 As shown, the organic modifier can be a coupling agent or a surfactant, which undergoes physical adsorption and chemical bonding in a reactor and a high-speed ion mixer, and is filtered, washed, dried, and grinded to complete the organic modification of the surface of the thermal conductive powder.

[0052] Coupling agent modification is to combine the organic molecules on the coupling agent with the surface of inorganic powder, so as to reduce the surface free energy of inorganic powder, reduce agglomeration, and increase compatibility with organic matrix.

[0053] like Figure 3 As shown, step S1 is specifically as follows:

[0054] S11, adding the thermal conductive powder into a grinder for grinding, and adding a set amount of solvent to obtain a thermal conductive powder with uniform particles.

[0055] S12, adding a set amount of solvent to the thermally conductive powder with uniform particles, stirring with a stirrer to obtain a uniformly stirred powder solution.

[0056] S13, adding an organic modifier to the solution, stirring the solution with a stirrer to obtain a uniformly stirred organic modified solution.

[0057] S14, slowly drop the uniformly stirred organic modifier solution into the uniformly stirred powder solution, and stir evenly with a stirrer to obtain a mixed solution.

[0058] S15, heating the mixed solution to allow the organic modifier to react with the surface of the thermally conductive powder. After a certain reaction time, centrifuging the mixed solution, pouring off the upper clear liquid, leaving the modified thermally conductive powder material; washing the modified thermally conductive powder with a solvent to remove the residual organic modifier and other impurities; drying the washed thermally conductive powder to obtain a thermally conductive powder with an organically modified surface.

[0059] S2, adding the modified thermally conductive powder and rubber 3 into an internal mixer according to a set ratio to complete internal mixing with rubber 3 to obtain a rubber 3 powder composite.

[0060] For example, the thermal conductive powder is nano silver powder, the rubber 3 is hydrogenated nitrile rubber 3, and the rubber 3 powder composite is prepared as follows:

[0061] Add nano silver powder to a grinder, add an appropriate amount of solvent, and obtain a powder with a more uniform particle size through grinding; add solvent and stir evenly with a stirrer; add organic modifier to solvent and stir evenly with a stirrer; slowly drop organic modifier solution into nano silver powder material solution and stir evenly with a stirrer; heat the mixed solution, and the organic modifier reacts with the surface of nano powder; react for a certain time, centrifuge the mixed solution, pour off the supernatant, and leave the modified nano powder material; repeatedly wash the modified nano silver powder with solvent to remove residual organic modifier and other impurities; dry the washed nano silver powder to obtain nano silver powder with organic modification on the surface. Mix silver powder with hydrogenated nitrile rubber 3 at a ratio of 100:100 to obtain a composite colloid with low heat generation and high thermal conductivity, and finally complete the molding and vulcanization of the composite colloid between the core shaft and the stator housing 2 through injection molding tooling and equipment.

[0062] In this embodiment, the stator bushing 1 is mechanically blended with modified nano silver powder and hydrogenated nitrile rubber 3, which has the advantages of low cost, simple production process, high thermal conductivity, etc. The present invention can be applied to the manufacture of high-temperature screw drill tools and ultra-deep well drilling, and has practical application value.

[0063] In this step, the heat-conducting powder is organically combined with the rubber 3 through physical or chemical bonds by an internal mixer, and the superconductor forms a continuous network structure in the rubber 3, and finally a super-heat-conducting composite elastomer is obtained.

[0064] The thermal conductivity mechanism of the rubber 3 powder composite is as follows:

[0065] The thermal conductivity of the thermally conductive rubber 3 composite material is ultimately determined by the combined effect of the rubber 3 matrix and the thermally conductive powder. The thermal conductivity of the thermally conductive powder is much greater than that of the rubber 3 matrix. When the amount of thermally conductive powder is small, the thermally conductive powder particles can be evenly dispersed in the system without contact and interaction. At this time, the thermally conductive powder does not contribute much to the thermal conductivity of the entire system. When the thermally conductive powder reaches a certain value, the thermally conductive powder particles begin to interact with each other and form a chain-like and mesh-like form in the system called a thermal conductive network chain. When the orientation of these thermally conductive networks is parallel to the direction of heat flow, the thermal conductivity of the system can be greatly improved. This is similar to a simple circuit. When two resistors of different resistance values ​​are connected in parallel, the smaller the resistance value, the greater the contribution to the total current in the circuit at a certain voltage. In the system, the rubber 3 matrix and the thermally conductive powder can be regarded as two thermal resistors respectively. Obviously, the thermal conductivity of the matrix itself is very poor, and the corresponding thermal resistance is very large, while the thermal resistance of the thermally conductive powder itself is very small. However, if the thermal conductive network chain is not formed in the system in the direction of heat flow, so that the thermal resistance of the rubber 3 matrix and the thermal resistance of the thermal conductive powder are in series, the total thermal resistance in the direction of heat flow is very large, which ultimately leads to poor thermal conductivity of the system. When the thermal conductive network chain is formed in the direction of heat flow, the thermal resistance formed by the thermal conductive powder is greatly reduced, and there is a parallel relationship between the thermal resistance of the rubber 3 matrix and the thermal conductive powder. In this way, the thermal conductive network chain plays a leading role in the thermal conductivity of the entire system and greatly improves the thermal conductivity of the system.

[0066] The present invention also provides a method for preparing a rubber 3 metal composite, comprising the following steps: cleaning a flexible mesh, drying the flexible mesh after cleaning, dipping an adhesive on the dried flexible mesh, drying and cleaning the mesh again, and then combining the flexible mesh dipped in the adhesive with the rubber 3 by a process method, wherein the combining process includes but is not limited to a winding form, to obtain the rubber 3 metal composite.

[0067] The molding process of the metal rubber 3 includes the following steps: shaping the metal wire using a mold core, washing the wire, winding the wire, stretching, weaving the blank, molding, and cleaning to obtain the metal rubber 3 with a spiral inner cavity.

[0068] The metal rubber 3 penetrates into the stator housing 2 and is fixed to the inner wall of the housing by a fixing member, wherein the fixing member includes but is not limited to one or more combinations of rivets and adhesives, so as to obtain a stator bushing 1 that completely replaces the rubber 3 .

[0069] The metal rubber 3 can also be fixed to the stator housing 2 as a whole by vulcanizing the rubber 3. The rubber 3 has a low Mooney viscosity. An adhesive is applied to the fixed area, and after drying, the rubber 3 is vulcanized to obtain a stator bushing 1 that partially replaces the rubber 3.

[0070] The thermally conductive elastomer proposed in the present invention is obtained by selecting a base glue with good temperature resistance and introducing superconducting organic nanopowder to obtain a modified colloid having both the elastic sealing characteristics of rubber 3 and the excellent thermal conductivity of metal, or by adding thermally conductive ribs to rubber 3 to obtain a composite body. At the same time, the addition of the reinforcing rib structure effectively protects the base glue and greatly reduces the risk of premature thermal failure of weak links. The new composite body is used in motor stator molding to solve the problem of premature thermal aging of the stator bushing 1 due to temperatures exceeding 200°C in ultra-deep wells.

[0071] The present invention relates to a super-heat-resistant screw drill stator, which uses a heat-conducting rubber 3 composite. In a high-temperature well, the heat generated by continuous high-frequency scouring and shearing of mud and rotors can be quickly transferred to the drilling fluid by a heat-conducting network frame, and smoothly brought out of the formation through medium circulation, thereby solving the problem of heat accumulation caused by high heat generation and poor heat conduction of the stator rubber 3, which causes the local temperature rise of the spiral bushing to rise exponentially and cause rapid aging. At the same time, since a heat-resistant polymer material is used as a matrix, the metal colloid also has the advantage of elastic sealing. The metal colloid composite is used as the stator bushing 1, which can effectively prevent the stator rubber 3 from premature thermal failure due to ultra-high temperature.

[0072] Under actual operating conditions in oil fields, due to the continuous high-pressure scouring of mud and the high-frequency shearing action of the rotor, the stator liner 1 will accumulate excessive dynamic heat due to friction and repeated compression, causing the local temperature to increase exponentially, especially in the thick layer of the liner, the temperature is even far higher than 200°C. The stress concentration caused by this irreversible heat accumulation is a fatal defect that affects the service life of the elastomer in ultra-deep wells.

[0073] The ultra-heat-resistant screw drill stator of the present invention is characterized in that the stator bushing 1 adopts a super-thermal conductive elastomer, which not only maintains all the advantages of the original elastomer, but also has the excellent thermal conductivity of metal. This thermal conductive elastomer can truly achieve dynamic sealing under ultra-high temperature media in a well of 10,000 meters. The thermal conductive elastomer of the present invention can quickly transfer heat to the drilling fluid and bring the heat to the surface through the circulation of the drilling fluid. The drilling fluid acts as a coolant to stabilize the temperature of the stator bushing 1 within an acceptable range, slow down the aging speed of the elastomer, and extend its service life.

[0074] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A super-heat-resistant screw drill stator, characterized in that: The invention comprises a stator bushing and a stator shell. The stator bushing is arranged inside the stator shell and is a heat-conducting elastomer.

2. The super-temperature-resistant screw drill stator according to claim 1, characterized in that: The thermally conductive elastomer includes any one of a rubber powder composite and a rubber metal composite.

3. The super-temperature-resistant screw drill stator according to claim 2, characterized in that: The rubber powder composite and the rubber metal composite both include rubber and a heat-conducting material, wherein the mass ratio of the rubber to the heat-conducting material is 0:1-1:

3.

4. The super-temperature-resistant screw drill stator according to claim 3, characterized in that: The rubber includes one or a combination of nitrile rubber, hydrogenated nitrile rubber, hydrogenated carboxylated nitrile rubber, fluorinated nitrile rubber, fluorinated rubber, silica gel, and butyl rubber.

5. The super-temperature-resistant screw drill stator according to claim 3, characterized in that: The thermally conductive material of the rubber powder composite is thermally conductive powder, and the thermally conductive powder includes one or a combination of nano metal powder, silicon powder, SiC, SiN, AlN, BN, graphene, diamond, and nano carbon tubes.

6. The super-temperature-resistant screw drill stator according to claim 3 or 4, characterized in that: The heat-conducting material of the rubber-metal composite is a flexible net, and the flexible net includes one or more combinations of carbon fibers, heat pipes, and metal wires.

7. The super-temperature-resistant screw drill stator according to claim 3, characterized in that: The rubber-metal composite body includes metal rubber.

8. The super-temperature-resistant screw drill stator according to claim 5, characterized in that: The preparation method of the rubber powder composite comprises the following steps: Organic modification of the surface of thermally conductive powder; The modified thermally conductive powder and rubber are added into an internal mixer according to a set ratio to complete internal mixing with the rubber to obtain a rubber powder composite.

9. The super-temperature-resistant screw drill stator according to claim 8, characterized in that: The surface of the thermally conductive powder is organically modified, comprising the following steps: Add the thermal conductive powder into a grinder for grinding, and add a set amount of solvent to obtain a thermal conductive powder with uniform particles; Adding a set amount of solvent to the thermally conductive powder with uniform particles, stirring with a stirrer to obtain a uniformly stirred powder solution; Adding an organic modifier into the solution and stirring it with a stirrer to obtain a uniformly stirred organic modified solution; Add the uniformly stirred organic modifier solution dropwise to the uniformly stirred powder solution, and stir evenly with a stirrer to obtain a mixed solution; After heating the mixed solution for a set time, the mixed solution is centrifuged to obtain a modified thermally conductive powder; the modified thermally conductive powder is washed with a solvent to remove residual organic modifiers and other impurities; the washed thermally conductive powder is dried to obtain a thermally conductive powder with an organically modified surface.

10. The super-temperature-resistant screw drill stator according to claim 6, characterized in that: The preparation method of the rubber-metal composite comprises the following steps: cleaning the flexible net, drying it after cleaning, dipping the dried flexible net in adhesive, drying and cleaning it again, and then combining the flexible net dipped in adhesive with rubber to obtain the rubber-metal composite.

11. The super-temperature-resistant screw drill stator according to claim 9, characterized in that: The organic modifier is a coupling agent or a surfactant.

12. The super-temperature-resistant screw drill stator according to claim 7, characterized in that: The molding process of the metal rubber comprises the following steps: The metal wire is shaped by using a mold core, and the metal rubber is obtained after the metal wire is washed, wound, stretched, woven, molded and cleaned.

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