Turbine flowmeter suitable for mud flow measurement and method for reducing abrasion

Abstract

The invention relates to a turbine flowmeter suitable for slurry flow measurement and a method for reducing abrasion, and belongs to the technical field of well cementation grouting metrology. The turbine flowmeter comprises a flow pipe body used for feeding formula slurry, and the periphery of the flow pipe body is connected with a plurality of detachable sensor seats; the two retainers are connected to the two ends of the flow pipe body respectively. The shaft sleeve is inserted into one end, facing the flow pipe body, of the retainer; the impeller shaft is inserted into the shaft sleeve and rotates in the shaft sleeve, and the impeller shaft and the flow pipe body are coaxially arranged; the impeller is coaxially connected with the impeller shaft; the technical problems that in the prior art, when a turbine flowmeter is used for mud flow measurement, precision is low, and abrasion resistance is poor can be solved.

Description

Technical Field

[0001] The invention belongs to the technical field of cementing grouting metering, and in particular relates to a turbine flowmeter suitable for mud flow measurement and a method for reducing wear. Background Art

[0002] During the cementing process, it is necessary to inject formulated mud to remove the cuttings generated by drilling and fill the gaps in the well wall, so that cement slurry can be injected for solidification in the subsequent process. Different drilling conditions require different mud injection parameters. The measurement of high-pressure and low-flow mud injection (flow rate of approximately 0.1 cubic meters per minute) is particularly difficult, and it is necessary to take into account both the sensitivity of low-flow mud detection and the wear resistance of components.

[0003] Patent publication number CN219161367U discloses a low-wear turbine flowmeter. The low-wear turbine flowmeter comprises a tube body, a flow sensor disposed on the upper side of the tube body, the bottom end of the flow sensor extending into the tube body, a counter fixedly mounted on the top end of the flow sensor, and a front guide and a rear guide disposed within the tube body. The outer side of the front guide is fixedly connected to one end of a plurality of guide vanes, the other ends of which are fixedly connected to the inner wall of the tube body. A turbine is movably connected between the front and rear guides via a bearing, and a guide mechanism is disposed between the guide vanes.

[0004] The existing technology has the following defects:

[0005] 1. The use of guide plates to guide impurities will also divert the fluid being tested. Even if the diversion is a small amount, it will account for a large proportion for small-flow mud testing, thereby significantly reducing the accuracy of flow measurement;

[0006] 2. The turbine is connected to the bearing. When the turbine flowmeter is used to detect the flow of the formulated mud, the non-magnetic iron ore powder or barite powder and other additives in the formulated mud will cause severe wear on the bearing, greatly reducing the wear resistance of the turbine flowmeter. Summary of the Invention

[0007] The present invention provides a turbine flowmeter suitable for mud flow measurement and a method for reducing wear, which can solve the technical problems of low precision and poor wear resistance of turbine flowmeters in the prior art when used for mud flow measurement.

[0008] In order to achieve the above object, the present invention is implemented by the following technical solutions:

[0009] The present application provides a turbine flowmeter suitable for mud flow measurement, comprising:

[0010] A flow tube body is used to pass the formulated mud, and a plurality of detachable sensor seats are connected to the outer periphery of the flow tube body;

[0011] two retaining frames, respectively connected to the two ends of the flow tube body;

[0012] A shaft sleeve is inserted into one end of the retainer facing the flow tube body;

[0013] An impeller shaft is inserted into the shaft sleeve, the impeller shaft rotates in the shaft sleeve, and the impeller shaft is coaxially arranged with the flow tube body;

[0014] The impeller is coaxially connected to the impeller shaft.

[0015] Through the above technical solution, a diversion structure is not adopted to ensure that all the formulated mud passes through the impeller, thereby reducing the error of flow detection; the sliding friction between the sleeve and the impeller shaft is adopted to avoid the wear caused by the added material entering the bearing, thereby improving the overall wear resistance of the device.

[0016] In the present invention, the turbine flowmeter further comprises:

[0017] A cemented carbide ball abuts against an opening at one end of the sleeve where the sleeve is inserted into the retainer, with a side of the cemented carbide ball facing away from the sleeve abutting against the retainer. The cemented carbide ball, the sleeve, and the impeller shaft form a closed space relative to the formula slurry.

[0018] When the formulated mud is not introduced, there is a gap between the cemented carbide ball and the impeller shaft;

[0019] When the formulated slurry is introduced, the impeller shaft slides along the axial direction of the shaft sleeve, and one end of the impeller shaft contacts the cemented carbide ball.

[0020] Through the above technical solution, the gap between the carbide ball and the impeller shaft when the formulated mud is not passed into the impeller shaft can allow the impeller shaft to have a certain axial buffer space when the formulated mud is passed into the impeller shaft, thereby relieving the impact on the impeller. At the same time, when in working condition, the impeller shaft only makes point contact with the carbide ball in the axial direction, and the friction force is greatly reduced.

[0021] In the present invention, the turbine flowmeter further comprises:

[0022] An inspection hole is provided in the middle of the retaining frame, one end of the inspection hole opens toward the cemented carbide ball, and the other end of the inspection hole is provided with an internal thread.

[0023] Through the above technical solution, the method of setting up an inspection hole is adopted to improve the convenience of replacing worn parts on site, thereby improving the on-site maintenance performance of the turbine flowmeter.

[0024] In the present invention, the cemented carbide ball, the impeller and the impeller shaft are all made of tungsten-titanium-cobalt cemented carbide.

[0025] Through the above technical solution, tungsten-titanium-cobalt cemented carbide is used, which has higher hardness and thus obtains stronger wear resistance.

[0026] The present application also provides a method for reducing wear of a turbine flowmeter suitable for measuring mud flow, which uses the turbine flowmeter as described above and further includes the following steps:

[0027] Step S1: during assembly, the cemented carbide ball is placed into the retaining frame, and the shaft sleeve is pressed into the retaining frame, and the displacement of the cemented carbide ball is limited by the interference fit between the shaft sleeve and the retaining frame;

[0028] Step S2: injecting grease into the sleeve, and then inserting one end of the impeller shaft on which the impeller is installed with an interference fit into the sleeve of one of the retaining frames;

[0029] Step S3: After the retainer with the impeller shaft inserted is installed in the flow tube body, another retainer is installed at the other end so that both ends of the impeller shaft are inserted into the shaft sleeve injected with grease.

[0030] Through the above technical solution, by pre-filling grease in the closed space, the buffering effect is further improved when the impeller shaft is subjected to axial impact force, and the wear of the impeller shaft is further slowed down by reducing the friction between the carbide ball and the impeller shaft.

[0031] In the present invention, the above step S1 further includes:

[0032] Step S1-1: before the cemented carbide ball is placed in the retaining frame, interface grease is applied to the surface of the cemented carbide ball.

[0033] Through the above technical solution, the interface grease is applied in advance to avoid metal adhesion between the cemented carbide ball and the retaining frame during use, further improving the convenience of replacing the cemented carbide ball after wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] 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 only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 An axonometric diagram of a turbine flowmeter suitable for mud flow measurement provided by an embodiment of the present invention;

[0036] Figure 2 A front view of a turbine flowmeter suitable for measuring mud flow provided by an embodiment of the present invention;

[0037] Figure 3 for Figure 2 The sectional view at AA in the figure;

[0038] Figure 4 for Figure 3 A partial enlarged view of point B when the formulated mud is not injected;

[0039] Figure 5 for Figure 3 A partial enlarged view of point B when the formulated slurry is injected;

[0040] Figure 6 An exploded diagram of a turbine flowmeter suitable for mud flow measurement provided by an embodiment of the present invention.

[0041] Icons: 1-flow tube body; 2-impeller; 3-impeller shaft; 4-sleeve; 5-retainer; 501-inspection hole; 6-pressure ring; 7-female oil pin; 8-male oil pin; 9-carbide ball; 10-sensor seat; 11-oil pin tray; 12-grease. DETAILED DESCRIPTION

[0042] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0043] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply 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 on this application.

[0044] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0045] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installation," "connection," and "connection" should be understood in a broad sense. For example, they can refer to welding, bolting, or riveting; fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0046] Example:

[0047] Please refer to Figures 1 to 6 , Figures 1 to 6 An embodiment of the present application is shown.

[0048] This embodiment provides a turbine flowmeter suitable for mud flow measurement, such as Figures 1 to 3 As shown, it includes:

[0049] The flow tube body 1 is used to pass the formulated mud, and the outer periphery of the flow tube body 1 is connected to a plurality of detachable sensor seats 10;

[0050] Two retainers 5 are connected to both ends of the flow tube body 1 respectively;

[0051] The shaft sleeve 4 is inserted into the end of the retainer 5 facing the flow tube body 1;

[0052] The impeller shaft 3 is inserted into the shaft sleeve 4, and the impeller shaft 3 rotates in the shaft sleeve 4. The impeller shaft 3 is coaxially arranged with the flow tube body 1;

[0053] The impeller 2 is coaxially connected to the impeller shaft 3.

[0054] The flow tube body 1 is made of 1Cr18Ni, which is non-magnetic stainless steel and designed to withstand a pressure of 70 MPa. Figure 1 and Figure 3 As shown, both ends of the flow tube body 1 are respectively threadedly connected with a female oil pin 7 and a male oil pin 8, and the two retainers 5 are inserted into the flow tube body 1 in a plug-in manner. Figure 6As shown, the retainer 5 supports the middle shaft hole in the form of three blades in contact with the flow tube body 1. The three blades are all made of 45 tempered steel that has been quenched to a hardness of HRC40-50. The end face of the retainer 5 and the end face of the flow tube body 1 abut against each other to limit the position, thereby ensuring the gap between the impeller shaft 3 and the retainers 5 at both ends, so as to avoid the retainers 5 at both ends clamping the impeller shaft 3 after installation. After the impeller 2, the impeller shaft 3 and the retainers 5 at both ends are assembled and inserted, the female oil pin 7 and the male oil pin 8 are also connected with a pressure ring 6 through an internal thread, and the pressure ring 6 abuts against the end of the retainer 5 away from the flow tube body 1. In addition, the outer side of the male oil pin 8 is also clamped with an oil pin disc 11, which is a standard part. Specifically, the female oil pin 7 and the male oil pin 8 can be selectively installed and adapted to the pipeline according to the slurry delivery pipeline during use; as shown Figure 2 and Figure 6 As shown, a plurality of grooves are provided on the end of the pressure ring 6 facing away from the flow tube body 1. During installation, a wrench is inserted into the groove and the pressure ring 6 is rotated to tighten it. Furthermore, a clearance fit is adopted between the impeller shaft 3 and the sleeve 4, and the clearance tolerance is 0.05mm~0.15mm. After the airtightness test, the non-magnetic iron ore powder and barite powder in the commonly used formula mud cannot be embedded in the gap. The assembly gap is selected based on the optimal gap when the impeller 2 can rotate continuously without obvious obstruction after the impeller 2 is moved by the finger. It should be emphasized that in this embodiment, the length of the sleeve 4 is only 26mm, the contact length between the sleeve 4 and the impeller shaft 3 is about 20mm, and the diameter of the impeller 2 is 45mm. There is also grease 12 between the sleeve 4 and the impeller shaft 3. Therefore, the impeller 2 will not be unable to rotate normally due to the contact area and friction between the sleeve 4 and the impeller shaft 3; the spiral tangent of the impeller 2 and the end face spiral rise angle are 30 degrees.

[0055] It should be noted that the turbine flowmeter provided in this embodiment is only used for the injection metering of high-pressure, low-flow formula mud. The formula mud is proportioned according to specific construction requirements, and its specific formula is a confidential technology. The technical solution provided in this embodiment is for measuring the formula mud under conventional working conditions, and is not used for the formula mud proportioning under special working conditions. However, the formula mud contains non-magnetic iron ore powder and / or barite powder to increase the density of the formula mud, thereby achieving the effect of squeezing out the debris in the well. At the same time, due to construction requirements, in order to avoid the occurrence of well wall collapse and the like, only a small flow rate of injection can be used, which is about 0.1 cubic meters to 0.3 cubic meters per minute (the injection rate is greater than 0.3 cubic meters). Other flow meters of existing technologies can be used for measurement, and cost and efficiency can be balanced). The viscosity is about 1.2mPa·s-2.5mPa·s. The total injection volume of the formula mud for a single project is only 10 cubic meters to 50 cubic meters. For the injection of small-flow formula mud, an exemplary method is used in actual construction. Compared with other flow meters, for example: the flow meter of the American brand Hedland, which can be used for high-pressure and small-flow measurement, will wear out after a cumulative injection of about 1,000 cubic meters and will not be able to continue to accurately measure. The turbine flow meter provided in this application only needs to be repaired for wear of the accessories after about 5,000 cubic meters of use. The inapplicability of other existing types of flow meters is explained as follows:

[0056] Electromagnetic flowmeters require the probe to be placed inside the pipe, where it is in direct contact with the medium. Mud's strong erosion ability can easily damage the probe. Commonly used mud formulas include water-based mud and oil-based mud. Oil-based mud has low conductivity, and electromagnetic flowmeters cannot accurately measure it.

[0057] Ultrasonic flowmeters are externally installed and require high installation accuracy. They also require that the fluid being measured must be free of bubbles and that the pipeline vibration is high. However, bubbles in the formulated mud and pipeline vibration are both insurmountable problems during cementing construction. Furthermore, built-in ultrasonic flowmeters cannot accurately measure flow due to the fragility of the built-in probe.

[0058] V-cone flowmeters are also not suitable because the formulated slurry is highly erosive and destructive to the throttling device.

[0059] At the same time, because the construction volume each time is not high and the cleanliness of the construction environment is poor, the use of high-precision probes and flow meters with high installation requirements are not suitable for the relocation and transfer of on-site construction equipment. Similarly, on-site maintenance of the above-mentioned flow meters is also impossible. Therefore, the direct measurement part of the turbine flow meter provided in this embodiment adopts a purely mechanical mechanism, which has better uniform speed capability and on-site maintenance capability.

[0060] Through the above technical solution, a diversion structure is not adopted to ensure that all the formulated mud passes through the impeller 2, thereby reducing the error of flow detection; the sliding friction between the sleeve 4 and the impeller shaft 3 is adopted to avoid the wear caused by the added material entering the bearing, thereby improving the overall wear resistance of the device.

[0061] As a preferred embodiment, the turbine flowmeter, such as Figures 3 to 5 As shown, it also includes:

[0062] The carbide ball 9 abuts against the opening at one end of the sleeve 4 where the sleeve is inserted into the retainer 5. The side of the carbide ball 9 facing away from the sleeve 4 abuts against the retainer 5. The carbide ball 9, the sleeve 4 and the impeller shaft 3 form a closed space relative to the formula mud.

[0063] like Figure 4 As shown, when the formulated mud is not introduced, there is a gap between the carbide ball 9 and the impeller shaft 3;

[0064] like Figure 5 As shown, when the formula mud is introduced, the impeller shaft 3 slides along the axial direction of the sleeve 4, and one end of the impeller shaft 3 contacts the cemented carbide ball at 9 points.

[0065] Exemplarily, the grease 12 is butter or molybdenum disulfide grease. Butter has a lower cost of use, while molybdenum disulfide grease can meet the high-pressure use environment and has a good lubrication effect under high pressure.

[0066] During use, when the formula mud is introduced and when it is continuously introduced, a strong force will be generated on the blade surface of the impeller 2. This force is decomposed into the force that makes the impeller 2 rotate around the central axis, and the force of the impeller 2 axially moving along the impeller shaft 3. It should be emphasized that when the existing technology uses bearings, due to the problem of axial impact force, the lateral force borne by the bearings is large, which makes the bearings unable to be used for a long time. Replacing bearings with more complex structures will greatly increase the cost of wearing parts. When the impeller shaft 3 is subjected to axial pressure, the impeller shaft 3 compresses the grease 12 in the enclosed space to compress it to resist the axial force. When the formula mud is introduced, the impact force is large, and the grease 12 is compressed to form a buffer. During operation, the pressure of the grease 12 cannot offset the formula mud caused to the impeller shaft 3 The axial force of the impeller shaft 3 will maintain point contact with the carbide ball 9 under the working condition of stable flow rate. When the introduction of the formula mud is stopped, the axial force disappears, and the grease 12 recovers its volume to separate the impeller shaft 3 and the carbide ball 9 to avoid metal adhesion. At the same time, because there is grease 12 at both ends, and there is a certain friction between the sleeve 4 and the impeller shaft 3, the impeller shaft 3 will not vibrate after buffering and pressure balance. Regarding the problem of mud invading through the gap between the sleeve 4 and the impeller shaft 3, because the carbide ball 9 seals the retaining frame 5, the actual grease 12 is in an actual semi-closed space (relative to the closed space of the formula mud). When the grease 12 cannot form a convection with the external fluid, the formula mud cannot replace the grease 12.

[0067] It should be emphasized that, because the grease 12 is in continuous use, it will be gradually squeezed out from the gap between the sleeve 4 and the impeller shaft 3 due to pressure. Therefore, it is necessary to confirm the axial buffering performance of the impeller shaft 3 before each use. Inspection and maintenance.

[0068] Through the above technical solution, the gap between the carbide ball 9 and the impeller shaft 3 when the formulated mud is not passed can allow the impeller shaft 3 to have a certain axial buffer space when the formulated mud is passed, thereby relieving the impact on the impeller 2. At the same time, when in working condition, the impeller shaft 3 only makes point contact with the carbide ball 9 in the axial direction, and the friction force is greatly reduced.

[0069] As a preferred embodiment, the turbine flowmeter, such as Figure 3 and Figure 4 As shown, it also includes:

[0070] The inspection hole 501 is provided in the middle of the retaining frame 5 , one end of the inspection hole 501 opens toward the cemented carbide ball 9 , and the other end of the inspection hole 501 is provided with an internal thread.

[0071] During use, if the inspection before use finds that the impeller 2 rotates a large amount or the end face of the impeller shaft 3 is severely worn, a metal rod is inserted through the inspection hole 501 to knock out the carbide ball 9 and the sleeve 4, and they are replaced according to the wear conditions. During installation, the inspection hole 501 is also used as an exhaust hole to ensure that the carbide ball 9 completely abuts the retaining frame 5. After the installation is completed, the inspection hole 501 needs to be sealed with screws.

[0072] Compared with the existing technology that uses bearings, the disassembly of bearings requires a puller and a press-in device. At the same time, the disassembly and installation of bearings require maintenance personnel to have corresponding skills. This places high demands on on-site construction personnel and cannot meet the requirements of professional bearing maintenance personnel and special bearing disassembly and assembly tools. However, this embodiment uses the inspection hole 501 to complete basic disassembly and assembly, which greatly reduces the maintenance work's requirements for skills and auxiliary devices.

[0073] Through the above technical solution, the maintenance hole 501 is provided to improve the convenience of replacing worn parts on site, thereby improving the on-site maintenance performance of the turbine flowmeter.

[0074] As a preferred embodiment, the cemented carbide ball 9, the impeller 2 and the impeller shaft 3 are all made of tungsten-titanium-cobalt cemented carbide.

[0075] For example, the cemented carbide ball 9, the impeller 2 and the impeller shaft 3 are all made of cemented carbide YT15. YT15 has a surface hardness of 91HRA, which can fully meet the erosion resistance of additives in conventional formula mud.

[0076] It should be noted that the overall idea of ​​this embodiment is mainly to increase the axial wear of the impeller shaft 3, and is not mainly aimed at reducing the wear of the impeller 2. Reducing the wear of the impeller 2 requires surface design based on specific mud formula, flow rate and other parameters. This type of surface design does not fall within the scope of protection of this application.

[0077] Through the above technical solution, tungsten-titanium-cobalt cemented carbide is used, which has higher hardness and thus obtains stronger wear resistance.

[0078] This embodiment also provides a method for reducing wear of a turbine flowmeter suitable for measuring mud flow, which uses the turbine flowmeter as described above and further includes the following steps:

[0079] Step S1: During assembly, the carbide ball 9 is placed into the retainer 5 and the sleeve 4 is pressed into the retainer 5, and the displacement of the carbide ball 9 is limited by the interference fit between the sleeve 4 and the retainer 5;

[0080] Step S2: injecting grease 12 into the shaft sleeve 4, and then inserting one end of the impeller shaft 3 on which the impeller 2 is installed with an interference fit into the shaft sleeve 4 of a retainer 5;

[0081] Step S3: After the retainer 5 with the impeller shaft 3 inserted is installed into the flow tube body 1, another retainer 5 is installed at the other end so that both ends of the impeller shaft 3 are inserted into the shaft sleeve 4 injected with grease 12.

[0082] Through the above technical solution, by pre-filling grease 12 in the closed space, the buffering effect is further improved when the impeller shaft 3 is subjected to axial impact force, and the wear of the impeller shaft 3 is further slowed down by reducing the friction between the carbide ball 9 and the impeller shaft 3.

[0083] As a preferred implementation, the above step S1 further includes:

[0084] Step S1 - 1 : Before the cemented carbide ball 9 is placed in the retainer 5 , an interface grease is applied to the surface of the cemented carbide ball 9 .

[0085] Through the above technical solution, the interface grease is applied in advance to avoid metal adhesion between the cemented carbide ball 9 and the retaining frame 5 during use, further improving the convenience of replacing the cemented carbide ball 9 after wear.

[0086] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope of the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A turbine flowmeter suitable for measuring mud flow, characterized in that: include: A flow tube body (1) is used for introducing the formulated slurry, and a plurality of detachable sensor seats (10) are connected to the outer periphery of the flow tube body (1); Two retaining frames (5) are respectively connected to two ends of the flow tube body (1); A shaft sleeve (4) is inserted into one end of the retaining frame (5) facing the inside of the flow tube body (1); An impeller shaft (3) is inserted into the shaft sleeve (4), the impeller shaft (3) rotates in the shaft sleeve (4), and the impeller shaft (3) and the flow tube body (1) are coaxially arranged; The impeller (2) is coaxially connected to the impeller shaft (3).

2. The turbine flowmeter suitable for mud flow measurement according to claim 1, characterized in that: Also includes: A hard alloy ball (9) is in contact with an opening at one end of the sleeve (4) inserted into the retaining frame (5), and a side of the hard alloy ball (9) facing away from the sleeve (4) is in contact with the retaining frame (5). The hard alloy ball (9), the sleeve (4) and the impeller shaft (3) form a closed space relative to the formula slurry; When the formulated mud is not introduced, a gap exists between the hard alloy ball (9) and the impeller shaft (3); When the formula slurry is introduced, the impeller shaft (3) slides along the axial direction of the shaft sleeve (4), and one end of the impeller shaft (3) is in point contact with the hard alloy ball (9).

3. The turbine flowmeter suitable for mud flow measurement according to claim 2, characterized in that: Also includes: An inspection hole (501) is provided in the middle of the retaining frame (5), one end of the inspection hole (501) opens toward the hard alloy ball (9), and the other end of the inspection hole (501) is provided with an internal thread.

4. The turbine flowmeter suitable for mud flow measurement according to claim 3, characterized in that: The hard alloy ball (9), the impeller (2), and the impeller shaft (3) are all made of tungsten-titanium-cobalt hard alloy.

5. A method for reducing wear of a turbine flowmeter suitable for measuring mud flow, characterized in that: The use of the turbine flow meter according to claim 4 further comprises the following steps: Step S1: during assembly, the carbide ball (9) is placed into the retaining frame (5), and the shaft sleeve (4) is pressed in, and the displacement of the carbide ball (9) is limited by the interference fit between the shaft sleeve (4) and the retaining frame (5); Step S2: injecting grease into the shaft sleeve (4), and then inserting one end of the impeller shaft (3) on which the impeller (2) is installed in an interference fit into the shaft sleeve (4) of one of the retaining frames (5); Step S3: After the retainer (5) with the impeller shaft (3) inserted is installed in the flow tube body (1), another retainer (5) is installed at the other end so that both ends of the impeller shaft (3) are inserted into the shaft sleeve (4) injected with grease.

6. The method for reducing wear of a turbine flowmeter suitable for mud flow measurement according to claim 5, characterized in that: The step S1 further includes: Step S1-1: before the cemented carbide ball (9) is placed in the retaining frame (5), interface grease is applied to the surface of the cemented carbide ball (9).

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