Fully automatic medium pressure fluid loss performance measuring instrument and test method

Abstract

The present invention relates to the technical field of drilling fluid performance measurement equipment, and is a fully automatic medium-pressure water loss performance measuring instrument and testing method. The former includes a base, a mud cake generating assembly, a filter paper conveying assembly, a mud cake testing assembly, and a cleaning assembly. The present invention has a reasonable and compact structure. The mud cake generating assembly can make a mud cake from the drilling fluid as required. The mud cake is transported to the position of the mud cake testing assembly via the filter paper conveying assembly. The mud cake testing assembly can perform thickness testing and viscosity coefficient testing on the mud cake. After the test, the mud cake is transferred and unloaded by the mud cake testing assembly. After the test, the cleaning assembly cleans and dries the mud cake generating assembly and the mud cake testing assembly to facilitate the next test operation. The present invention has the characteristics of being flexible, compact, and highly scalable. It can realize repeated testing of drilling fluid mud cake thickness, viscosity coefficient, and other properties, greatly saving personnel costs and reducing personnel labor intensity. It has a strong value for promotion and application.

Description

Technical Field

[0001] The invention relates to the technical field of drilling fluid performance measurement equipment, in particular to a full-automatic medium-pressure water loss performance measuring instrument and a testing method. Background Art

[0002] The traditional method for measuring the medium-pressure water loss related properties of drilling fluid is to use several instruments such as medium-pressure water loss meter, steel ruler, mud cake adhesion meter, etc. to measure separately. The test process is cumbersome and cannot meet the requirements of collecting a large amount of drilling fluid performance data, which restricts the development of automation and informatization in the drilling fluid technical service industry. The current shortcomings such as scattered functions, difficulty in carrying, poor consistency in repeated operations, and large errors in manual readings seriously restrict the automation of the measurement industry, the development of informatization of drilling fluid technology, and the large-scale application of big data. A fully automatic instrument that can meet the requirements of medium-pressure water loss performance measurement of drilling fluid has been developed. This invention integrates the method of automation technology and introduces the concept of modular design to redesign and combine the drilling fluid medium-pressure water loss related performance test instruments. The resulting invention is flexible, compact, and highly scalable. It can realize fully automatic repeated testing of drilling fluid medium-pressure water loss related properties, greatly saves personnel costs, reduces personnel labor intensity, and has strong promotion and application value. Summary of the Invention

[0003] The present invention provides a fully automatic medium-pressure water loss performance measuring instrument and testing method, which overcomes the shortcomings of the above-mentioned existing technologies. It can effectively solve the problems of existing drilling fluid medium-pressure water loss related performance measurement devices, such as scattered functions, difficulty in carrying, poor consistency in repeated operations, large errors in manual readings, and cumbersome testing procedures.

[0004] One of the technical solutions of the present invention is achieved through the following measures: a fully automatic medium-pressure water loss performance measuring instrument, including a base, a mud cake generating assembly, a filter paper conveying assembly, a mud cake testing assembly and a cleaning assembly, wherein a mud cake generating assembly for generating a mud cake from drilling fluid and a mud cake testing assembly for testing the thickness and viscosity coefficient of the mud cake are arranged on the base from right to left, and a filter paper conveying assembly for conveying the mud cake made by the mud cake generating assembly to the mud cake testing assembly is also provided on the base, and a cleaning assembly is provided on the upper side of the filter paper conveying assembly.

[0005] The following is a further optimization and / or improvement of one of the above-mentioned technical solutions:

[0006] The above-mentioned mud cake generating assembly may include a slurry cup, a cup cover, a cup bottom, a locking screw, a locking gear, a locking motor and a gear ring. A cup cover with a grouting hole extending through the center is fixedly installed on the upper right side of the base. A slurry cup with a hollow structure is provided under the cup cover. At least three connecting ears are distributed along the circumference on the outer side of the upper end of the slurry cup at intervals. Each connecting ear has a locking threaded through hole on the upper end, and a locking screw is screwed in each locking threaded through hole. A fixing plate is fixedly installed on the outer side of the cup cover corresponding to each connecting ear position, and the upper end of each locking screw is rotatably installed with the fixing plate at the corresponding position. A locking gear is fixedly installed on the outer side of the upper part of the locking screw corresponding to the lower side of each fixing plate. Several fixing ears are evenly distributed along the circumference on the outer side of the middle of the slurry cup, and a fixing ring is fixed on the outer side of the lower side of the slurry cup. A connecting through hole corresponding to the fixing ear is provided on the lower side of the fixing ring. A guide hole extending through the upper side is provided on the upper side of the fixing ear corresponding to each connecting through hole position. Each guide hole is provided with a limited position fixed after the lower end passes through the corresponding connecting through hole. The sliding shaft of the block, a guide gear is fixedly installed on the outer side of the upper part of the sliding shaft corresponding to the upper side position of each fixed ear, a compression spring is provided between the outer side of the lower part of the sliding shaft corresponding to the position below each fixed ear and the corresponding position on the upper side of the fixed ring, a locking motor is fixedly installed on the middle part of the base corresponding to the leftmost sliding shaft position, and a locking drive gear is fixedly installed on the outer side of the upper end of the output shaft of the locking motor, and the locking drive gear is connected to the upper part of the leftmost guide gear through the first synchronous belt transmission, and a gear ring is provided on the outer side of the lower part of the slurry cup that is meshed with all the locking gears and all the guide gears. The lower side of the slurry cup is provided with a corresponding cup bottom, and the right part of the filter paper transmission assembly is provided between the upper side of the cup bottom and the lower side of the slurry cup. The lower part of the base is provided with a lifting drive mechanism that can drive the cup bottom to move up and down, and a filter hole is provided in the center of the cup bottom that passes through the upper and lower parts, and a filter tube is sealed and fixedly installed in the filter hole, and a drain valve is provided on the filter tube. A measuring cylinder is fixedly installed on the inner side of the lower part of the base corresponding to the lower side of the filter tube, and a drainage hole is provided at the lower end of the measuring cylinder, and a waste liquid valve that can open and close the drainage hole is provided at the lower part of the base.

[0007] The filter paper conveying assembly may include a conveying motor, a driving shaft, a second synchronous belt, a third synchronous belt and a filter screen. The lower part of the base corresponding to the lower right position of the cup bottom is rotatably installed with a forward and backward driving shaft, the left part of the base corresponding to the left position of the driving shaft is rotatably installed with a first driven shaft, the middle part of the base corresponding to the upper left position of the first driven shaft is rotatably installed with a second driven shaft, the left part of the base corresponding to the position above the second driven shaft is rotatably installed with a third driven shaft, and the upper part of the base corresponding to the position between the third driven shaft and the pulp cup is rotatably installed with a fourth driven shaft and a fifth driven shaft. The sixth driven shaft is rotatably installed on the right side of the base corresponding to the right position of the cup bottom, and a transmission motor is fixedly installed on the inner side of the lower part of the base corresponding to the upper left position of the driving shaft. The front end of the output shaft of the transmission motor is connected to the rear of the driving shaft through a pulley transmission. The front outer side and the rear outer side of the driving shaft are respectively fixed with a front driving gear and a rear driving gear. The front outer side of the first driven shaft, the front outer side of the second driven shaft, the front outer side of the third driven shaft, the front outer side of the fourth driven shaft, the front outer side of the fifth driven shaft and the front outer side of the sixth driven shaft are respectively fixed with a first front driven gear The first rear driven gear, the second rear driven gear, the third rear driven gear, the fourth rear driven gear, the fifth rear driven gear and the sixth rear driven gear are fixedly installed on the outer rear part of the first driven shaft, the outer rear part of the second driven shaft, the outer rear part of the third driven shaft, the outer rear part of the fourth driven shaft, the outer rear part of the fifth driven shaft and the outer rear part of the sixth driven shaft respectively. The front driving gear, the first front driven gear, the second front driven gear, the third front driven gear, the fourth front driven gear, the fifth rear driven gear and the sixth rear driven gear are fixedly installed on the outer rear part of the first driven shaft, the outer rear part of the second driven shaft, the outer rear part of the third driven shaft, the outer rear part of the fourth driven shaft, the outer rear part of the fifth driven shaft and the outer rear part of the sixth driven shaft respectively. The driven gear, the fourth front driven gear, the fifth front driven gear and the sixth front driven gear are connected together by a second synchronous belt transmission, and the rear driving gear, the first rear driven gear, the second rear driven gear, the third rear driven gear, the fourth rear driven gear, the fifth rear driven gear and the sixth rear driven gear are connected together by a third synchronous belt transmission which has the same structure as the second synchronous belt and is symmetrically distributed. A filter screen is fixedly installed on the outer ring surface of the second synchronous belt on the upper right side between the pulp cup and the bottom of the cup, and the rear part of the filter screen is fixedly installed at a corresponding position on the outer ring surface of the third synchronous belt.

[0008] The above-mentioned mud cake testing assembly may include a test seat, a first test frame, a second test frame, a first test motor, a second test motor, an electric push rod, a test plate, a sticking block and a control unit. The test seat located above the filter screen is fixedly installed on the upper left side of the base, and the first test frame is slidably installed on the upper edge of the test seat. A test screw hole is provided on the upper portion of the first test frame, and a test screw is screwed in the test screw hole. The first test motor is fixedly installed on the right side of the test seat, and the upper end of the output shaft of the first test motor is transmission-connected to the lower end of the test screw. The second test frame is fixedly installed on the left rear side of the first test frame, and the second test motor is fixedly installed on the second test frame. A winding post with a right end transmission-connected to the left end of the output shaft of the second test motor is rotatably installed on the upper portion of the second test frame corresponding to the position below the winding post. A retracting block is fixedly installed on the lower side of the retracting block, and a receiving groove with an opening downward and passing through left and right is provided on the lower side of the retracting block. Two wire threading holes are provided on the left and right sides of the upper end of the retracting block, and both lower ends extend to the bottom wall of the receiving groove. , each threading hole is provided with a retractable rope, the first end of which is wrapped around several times and then fixedly installed with the corresponding position of the winding column, the second end of each retractable rope is fixedly installed with the upper side of the sticky block that matches the upper part of the storage groove, and the upper part of each threading hole is provided with an induction magnet sleeved on the outside of the retractable rope, and a thickness probe with the lower end located below the sticky block is fixedly installed on the lower side of the second test frame corresponding to the right position of the retractable block, and a test plate with the upper side in contact with the inner ring surface of the upper part of the filter screen is provided on the base corresponding to the position between the third driven shaft and the fourth driven shaft, and the test plate is fixedly installed with hinged ears rotatably installed with the corresponding position of the third driven shaft on the front left and the rear left of the test plate, an electric push rod is hingedly connected between the lower right side of the test plate and the inner left side of the base, and a gyroscope and a Hall sensor corresponding to the induction magnet are provided at intervals on the left and right sides of the lower left side of the test plate. The thickness probe, gyroscope and Hall sensor are all electrically connected to the control unit, and the control unit is electrically connected to the first test motor, the second test motor and the transmission motor respectively.

[0009] The above-mentioned cleaning assembly may include a rotary joint, a center cylinder, a cleaning motor, a cleaning box and a cleaning pipe. A rotary joint is provided above the cup cover, and a center cylinder with a cylindrical structure with a closed lower end is sealed and rotatably installed at the lower end of the rotary joint. The lower end of the center cylinder is sealed and rotatably passed through the grouting hole and is located on the inner side of the lower part of the slurry cup. There are radially through cleaning holes discretely distributed on the lower outer side of the center cylinder. A cleaning motor electrically connected to the control unit is fixedly installed on the base corresponding to the right position of the cup cover, and the upper end of the output shaft of the cleaning motor is connected to the upper part of the center cylinder through a pulley transmission. The first test frame is rotatably installed with a front-to-back first rotating shaft on the lower left side, and the outer side of the left side of the first rotating shaft is fixedly installed with the upper right end of the cleaning box which is sleeved on the outer side of the lower part of the retracting block. The upper part of the cleaning box is fixedly connected with a cleaning pipe, and a first turning arm with a left higher and right lower shape is fixedly installed on the outer side of the lower part of the first rotating shaft. A second rotating shaft parallel to the first rotating shaft is fixedly installed on the right side of the first turning arm, and a left-right third rotating shaft is rotatably installed on the left side of the rear of the test seat corresponding to the position above the second rotating shaft. The transmission gear of the present invention is a gear selected from the group consisting of a first gear and a second gear selected from the group consisting of a and a plurality of gears, and a plurality of gears are connected to each other to form a pair of mutually exclusive gears, and a plurality of gears are connected to each other to form a plurality of gears.

[0010] The outer wall of the lower end of the above-mentioned slurry cup can be a conical surface that is smaller at the top and larger at the bottom, and the outer side of the cup bottom matches the inner side of the lower end of the slurry cup, and an annular liquid collecting box is fixedly installed on the lower side of the cup bottom, and an annular groove opening upward is provided in the liquid collecting box, and the outer diameter of the annular groove is larger than the outer diameter of the cup bottom, and several drainage pipes are fixedly connected at intervals at the bottom of the liquid collecting box. The lifting drive mechanism includes a lifting screw, a mounting frame, a support plate, a slide rail, a guide rail and a lifting motor electrically connected to the control unit, and an L-shaped support plate is fixedly installed on the lower side of the cup bottom corresponding to the outer position of the filter tube, and a threaded through hole is provided at the lower part of the support plate, and a mounting frame is fixedly installed in the base corresponding to the position below the support plate, and a lifting motor is fixedly installed on the mounting frame, and the upper end of the output shaft of the lifting motor is transmission-connected with the lower end of the lifting screw screw in the threaded through hole on the upper side, and a plurality of slide rails are evenly distributed along the circumference of the outside of the liquid collecting box, and the upper end of each slide rail is provided with a guide groove that runs through up and down and opens outward, and a guide rail matching the guide groove is fixedly installed in the base corresponding to each slide rail position.

[0011] The above-mentioned mud cake generating assembly may also include a pressure relief valve and a liquid level gauge. A pressure relief hole and a positioning hole are provided at intervals on the upper end of the cup cover, which are connected vertically. The lower end of the pressure relief valve is sealed in the pressure relief hole, and the upper end of the liquid level gauge is sealed in the positioning hole. The pressure relief valve and the liquid level gauge are both electrically connected to the control unit.

[0012] The second technical solution of the present invention is achieved by the following measures: a test method of a fully automatic medium-pressure water loss performance measuring instrument, including a medium-pressure water loss measurement method, a mud cake thickness measurement method, and a mud cake viscosity coefficient measurement method:

[0013] The medium-pressure water loss measurement method is carried out as follows: filter paper is placed on the filter screen at the bottom of the cup, the lifting motor drives the cup bottom to move up and seal it with the lower end of the slurry cup, the drain valve is closed, and drilling fluid is injected into the slurry cup through the drilling fluid pump, and the locking motor is started. The locking motor drives the gear ring and the locking screw to rotate, and the locking screw drives the slurry cup to move up and seal it with the cup cover, and then the high-pressure air pump is used to inject air into the slurry cup through the center tube and pressurize it, and then the drain valve is opened. When the first drop of filtrate drips through the lower end of the filter tube, the timing starts, and the liquid level in the measuring cylinder is recorded when the specified time is up. If there is too much filtrate in the measuring cylinder, after the filtrate liquid level in the measuring cylinder reaches a certain position, the waste valve is quickly opened and closed, and the filtrate continues to drip after re-reading the liquid level height, and the liquid level height is recorded again. If the filtrate liquid level in the measuring cylinder exceeds the specified position again, the above actions are repeated, and finally all values are recorded to calculate the total volume of the filtrate;

[0014] The mud cake thickness measurement method is carried out as follows: after the medium-pressure water loss measurement is completed, the pressure relief valve is opened to release the air pressure in the slurry cup, and at the same time, the locking motor drives the locking screw to rotate in the opposite direction, the slurry cup and the cup cover are opened, and at the same time, the lifting motor drives the lifting screw to rotate, so that the bottom of the cup drops, and the excess drilling fluid will flow into the liquid collecting box along the four sides of the cup bottom. On the lower side of the slurry cup, the mud cake after the excess drilling fluid is released is on the filter paper of the filter screen. Driven by the second and third synchronous belts, the filter screen stops when it moves to the left below the cleaning box. The first test motor drives the test screw to drive the first test frame to slide upward The push rod rises with the second test frame and lifts the toggle gear at the front bottom, causing the second gear and the first gear to rotate, and finally swinging the upper left end of the cleaning box downward. Then, the first test motor drives the test screw to drive the first test frame to slide downward, causing the thickness probe to descend. The two poles at the lower end of the thickness probe are energized to analyze its conductivity. When the conductivity enters water from air, it will change dramatically. Then, when the conductivity enters drilling fluid from water, it will change slightly. The difference between the position where the thickness probe descends during the slight change and the position when the thickness probe reaches the lowest end is the calculated thickness of the mud cake.

[0015] The mud cake viscosity coefficient measurement method is carried out as follows: after calculating the mud cake thickness, the second test motor drives the winding column to rotate and release the viscosity block. After the viscosity block falls on the mud cake, the piston rod of the electric push rod extends, so that the right end of the test plate is higher than the left end. The gyroscope records the deflection angle of the test plate. At the same time, the Hall sensor calculates the magnetic field of the induction magnet. When the magnetic field changes, it means that the viscosity block slides and displaces along the surface of the mud cake. At this time, the value of the gyroscope is recorded, that is, the angle generated by the test plate, and the viscosity coefficient of the mud cake is converted.

[0016] The following is a further optimization and / or improvement of the second technical solution of the above invention:

[0017] After the above measurement work is completed, cleaning and drying work can be carried out. The cleaning work is carried out as follows: after the viscosity coefficient is measured, the second test motor drives the winding column to pull the viscosity block up and clamp it into the storage groove at the lower end of the retractable block. The first test motor drives the test screw to drive the first test frame to rise to the top again. The push rod drives another toggle rod to rise so that the cleaning box is reset and flipped up. The first test motor drives the test screw to drive the first test frame to descend again, so that the retractable block and thickness probe are lowered into the cleaning box. Finally, the cleaning pipe is connected to the water source and starts to spray water to clean the viscosity block and thickness probe. The thickness probe is cleaned. After cleaning, the first test frame rises to the top again, the cleaning box flips up, and the first test motor drives the test screw to drive the first test frame to drop again, so that the retractable block and the thickness probe drop to the preparation height. At the same time, the second synchronous belt and the third synchronous belt pull the filter to move to the left, and the water pump injects clean water into the central cylinder. The central cylinder is driven to rotate by the cleaning motor. The clean water cleans the inner wall of the slurry cup through the cleaning hole on the central cylinder. The drain valve is opened. While cleaning the slurry cup, the measuring cylinder and the waste liquid valve are cleaned. The cleaned liquid flows into the liquid collecting box below.

[0018] The drying work is carried out as follows: After the cleaning work is repeated many times, the water vapor pump inputs hot air into the central cylinder, and the hot air flows through the slurry cup, filter tube, measuring cylinder and waste liquid valve in turn for drying. After drying, the filter screen drives the new filter paper to move between the slurry cup and the cup bottom. The cup bottom rises and clamps the filter paper. At the same time, the locking motor drives the locking screw to seal the slurry cup and the cup cover.

[0019] The invention has a reasonable and compact structure. The mud cake generating assembly can form the drilling fluid into a mud cake as required. The formed mud cake is transported to the position of the mud cake testing assembly through the filter paper conveying assembly. The mud cake testing assembly can perform thickness test and viscosity coefficient test on the mud cake. After the test, the mud cake is transferred and unloaded by the mud cake testing assembly. After the test, the mud cake generating assembly and the mud cake testing assembly are cleaned and dried by the cleaning assembly to facilitate the next test operation. The invention has the characteristics of flexibility, compactness and strong scalability, and can realize repeated testing of the drilling fluid mud cake thickness, viscosity coefficient and other properties, which greatly saves personnel costs, reduces personnel labor intensity, and has strong promotion and application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Attachment Figure 1 This is a schematic diagram of the main partial cross-sectional structure of Example 1.

[0021] Attachment Figure 2 This is a schematic diagram of the top view of the structure of Example 1 after the rotary joint is removed.

[0022] Attachment Figure 3 Schematic diagram of the three-dimensional structure of the mud cake test assembly in Example 1 Figure 1 .

[0023] Attachment Figure 4 Schematic diagram of the three-dimensional structure of the mud cake test assembly in Example 1 Figure 2 .

[0024] Attachment Figure 5 This is a schematic diagram of the rear cross-sectional enlarged structure of the mud cake test assembly in Example 1.

[0025] Attachment Figure 6 This is a circuit block diagram of Example 1.

[0026] The numbers in the attached figure are: 1 for base, 2 for pulp cup, 3 for cup cover, 4 for cup bottom, 5 for fixing ring, 6 for locking screw, 7 for connecting ear, 8 for fixing ear, 9 for locking gear, 10 for locking motor, 11 for gear ring, 12 for sliding shaft, 13 for limit block, 14 for guide gear, 15 for locking drive gear, 16 for first synchronous belt, 17 for compression spring, 18 for filter tube, 19 for measuring cylinder, 20 for drain valve, 21 for waste Liquid valve, 22 is the transmission motor, 23 is the driving shaft, 24 is the front driving gear, 25 is the first driven shaft, 26 is the second driven shaft, 27 is the third driven shaft, 28 is the fourth driven shaft, 29 is the fifth driven shaft, 30 is the sixth driven shaft, 31 is the second synchronous belt, 32 is the third synchronous belt, 33 is the filter, 34 is the test seat, 35 is the first test stand, 36 is the second test stand, 37 is the first test motor, 38 is the second test Motor, 39 is an electric push rod, 40 is a test plate, 41 is a hinged ear, 42 is a test screw, 43 is a winding column, 44 is a retractable block, 45 is a sticky block, 46 is a retractable rope, 47 is a thickness probe, 48 is an induction magnet, 49 is a gyroscope, 50 is a Hall sensor, 51 is a rotary joint, 52 is a center tube, 53 is a cleaning motor, 54 is a cleaning box, 55 is a cleaning tube, 56 is a first rotating shaft, 57 is a second rotating shaft, 58 is a cleaning box, 59 is a cleaning box, 60 is a cleaning box, 61 is a cleaning box, 62 is a cleaning box, 63 is a cleaning box, 64 is a cleaning box, 65 is a cleaning box, 66 is a cleaning box, 67 is a cleaning box, 68 is a cleaning box, 69 is a cleaning box, 70 is a cleaning box, 71 is a cleaning box, 72 is a cleaning box, 73 is a cleaning box, 74 is a cleaning box, 75 is a cleaning box, 76 is a cleaning box, 77 is a cleaning box, 78 is a cleaning box, 79 is a cleaning box, 80 is a cleaning box, 81 is a cleaning box, 82 is a cleaning box, 83 is a cleaning box, 84 is a cleaning box, 85 is a cleaning box, 86 is a cleaning box, 87 is a cleaning box, 88 is a cleaning box, 89 is a cleaning box, 90 is a cleaning box, 91 is a cleaning box, 92 is a cleaning box, 93 is a cleaning box, 94 is a cleaning box, 95 is a cleaning box, 96 is a cleaning box, 97 is a cleaning box, 98 is a cleaning box, 99 is a cleaning box, 100 is a cleaning box, 8 is the third rotating shaft, 59 is the fourth rotating shaft, 60 is the first gear, 61 is the second gear, 62 is the fixed sleeve, 63 is the toggle tooth, 64 is the first crank arm, 65 is the second crank arm, 66 is the first connecting arm, 67 is the second connecting arm, 68 is the pawl, 69 is the push rod, 70 is the liquid collecting box, 71 is the drain pipe, 72 is the lifting motor, 73 is the lifting screw, 74 is the mounting frame, 75 is the support plate, 76 is the slide rail, and 77 is the guide rail. DETAILED DESCRIPTION

[0027] The present invention is not limited to the following embodiments, and specific implementation methods can be determined based on the technical solutions of the present invention and actual conditions.

[0028] In the present invention, for the convenience of description, the relative position relationship of each component is described based on the Figure 1 For example, the positional relationships of front, back, up, down, left, and right are determined according to the layout directions of the drawings in the specification.

[0029] The present invention will be further described below in conjunction with the embodiments and accompanying drawings:

[0030] Example 1: As shown in the attached Figure 1 、 2As shown in Figures 6 and 7, the fully automatic medium-pressure water loss performance measuring instrument includes a base 1, a mud cake generating assembly, a filter paper conveying assembly, a mud cake testing assembly and a cleaning assembly. The base 1 is provided with a mud cake generating assembly for generating a mud cake from drilling fluid and a mud cake testing assembly for testing the thickness and viscosity coefficient of the mud cake from right to left. The base 1 is also provided with a filter paper conveying assembly for conveying the mud cake generated by the mud cake generating assembly to the mud cake testing assembly. A cleaning assembly is provided on the upper side of the filter paper conveying assembly.

[0031] During use, by setting up a mud cake generating component, the drilling fluid can be made into a mud cake as required, and the prepared mud cake is transported to the mud cake testing component position through the filter paper conveying component. The mud cake testing component can perform thickness test and viscosity coefficient test on the mud cake. After the test, the mud cake is transferred and unloaded by the mud cake testing component. After the test, the mud cake generating component and the mud cake testing component are cleaned and dried by the cleaning component to facilitate the next test operation. The present invention has a reasonable and compact structure, is easy to use, and has the characteristics of flexibility, small size, and strong scalability. It can realize repeated testing of the thickness, viscosity coefficient and other properties of the drilling fluid mud cake, greatly saves personnel costs, reduces personnel labor intensity, and has a strong value for promotion and application.

[0032] The above-mentioned fully automatic medium-pressure fluid loss performance measuring instrument can be further optimized and / or improved according to actual needs:

[0033] As attached Figure 1 、 2As shown, the mud cake generating assembly includes a slurry cup 2, a cup cover 3, a cup bottom 4, a locking screw 6, a locking gear 9, a locking motor 10 and a gear ring 11. A cup cover 3 with a grouting hole extending up and down in the center is fixedly installed on the upper right side of the base 1. A slurry cup 2 with a hollow structure is provided below the cup cover 3. At least three connecting ears 7 are distributed along the circumference on the outer side of the upper end of the slurry cup 2. A locking threaded through hole is provided on the upper end of each connecting ear 7. A locking screw 6 is screwed into each locking threaded through hole. A fixing plate is fixedly installed on the outer side of the cup cover 3 corresponding to each connecting ear 7. Each locking screw The upper ends of 6 are rotatably mounted together with the fixed plates at the corresponding positions, and the outer sides of the upper parts of the locking screws 6 corresponding to the lower positions of each fixed plate are fixedly mounted with locking gears 9. Several fixing ears 8 are evenly spaced along the circumference of the outer side of the middle part of the pulp cup 2. A fixing ring 5 is fixed to the outer side of the lower part of the pulp cup 2. A connecting through-hole corresponding to the fixing ear 8 is provided on the lower side of the fixing ring 5. A guide hole is provided on the upper side of the fixing ear 8 corresponding to each connecting through-hole position, and a sliding shaft 12 is provided in each guide hole, the lower end of which passes through the corresponding connecting through-hole and is fixed with a limiting block 13. The guide gear 14 is fixedly installed on the outer side of the upper part of the sliding shaft 12 at the upper side of the ear 8, and a compression spring 17 is provided between the outer side of the lower part of the sliding shaft 12 corresponding to each fixed ear 8 and the corresponding position on the upper side of the fixed ring 5. A locking motor 10 is fixedly installed in the middle of the base 1 corresponding to the position of the leftmost sliding shaft 12, and a locking drive gear 15 is fixedly installed on the outer side of the upper end of the output shaft of the locking motor 10. The locking drive gear 15 is connected to the upper part of the leftmost guide gear 14 through the first synchronous belt 16. The outer side of the lower part of the pulp cup 2 is provided with a sleeve connected to all the locking gears 9 and all The guide gears 14 are meshed with each other in the gear ring 11, and the corresponding cup bottom 4 is provided on the lower side of the slurry cup 2. The right part of the filter paper conveying assembly is provided between the upper side of the cup bottom 4 and the lower side of the slurry cup 2. The lower part of the base 1 is provided with a lifting drive mechanism that can drive the cup bottom 4 to move up and down. A filter hole is provided in the center of the cup bottom 4, and a filter tube 18 is sealed and fixedly installed in the filter hole. A drain valve 20 is provided on the filter tube 18. A measuring cylinder 19 is fixedly installed on the inner side of the lower part of the base 1 corresponding to the lower side of the filter tube 18. The lower end of the measuring cylinder 19 has a drainage hole, and the lower part of the base 1 is provided with a waste liquid valve 21 that can open and close the drainage hole.

[0034] According to the requirements, a ring plate is fixedly installed on the outer side of the lower part of the sliding shaft 12, and a compression spring 17 is sleeved on the outer side of the sliding shaft 12 between the lower side of the ring plate and the fixed ring 5. The drain valve 20 and the waste valve 21 are both existing well-known technologies. During use, when the locking motor 10 is working, the output shaft of the locking motor 10 rotates, driving the guide gear 14 to rotate through the first synchronous belt 16, thereby rotating the ring gear 11 meshed with the guide gear 14, and the ring gear 11 drives the locking gear 9 to rotate. When the locking gear 9 rotates, the locking screw 6 rotates. When the locking screw 6 rotates, the connecting ear 7 and the slurry cup 2 move up and down, thereby achieving a seal between the cup cover 3 and the upper end of the slurry cup 2, facilitating the further processing of the drilling fluid after it is injected into the slurry cup 2. By setting the sliding shaft 12, the compression spring 17 and the fixed ear 8, the ring gear 11 can move up and down with the slurry cup 2 during the rotation process, thereby enabling the ring gear 11 to always mesh with the locking gear 9, and also play a supporting role for the ring gear 11. By setting the filter tube 18 And the drain valve 20 can collect the filtrate when the drilling fluid in the slurry cup 2 is pressurized and filtered. By setting the waste valve 21, the filtrate collected in the measuring cylinder 19 can be processed, which is also convenient for later cleaning. The right part of the filter paper conveying assembly is arranged between the upper side of the cup bottom 4 and the lower side of the slurry cup 2. The cup bottom 4 is raised and sealed with the slurry cup 2 by the lifting drive mechanism. After the drilling fluid in the slurry cup 2 is pressurized and filtered, the mud cake after the drilling fluid is filtered can be pressed on the filter paper conveying assembly. After the mud cake is made, the cup bottom 4 is lowered and reset by the lifting drive mechanism, and then the mud cake is transported to the mud cake testing assembly by the filter paper transmission assembly to measure the thickness and viscosity coefficient of the made mud cake. It has high integration, simplifies the test steps of drilling fluid water loss, mud cake thickness, and viscosity coefficient, and reduces the labor intensity of the staff.

[0035] As attached Figure 1 、 2As shown, the filter paper conveying assembly includes a conveying motor 22, a driving shaft 23, a second synchronous belt 31, a third synchronous belt 32 and a filter screen 33. The lower part of the base 1 corresponding to the lower right position of the cup bottom 4 is rotatably installed with a forward and backward driving shaft 23, the left part of the base 1 corresponding to the left position of the driving shaft 23 is rotatably installed with a first driven shaft 25, the middle part of the base 1 corresponding to the upper left position of the first driven shaft 25 is rotatably installed with a second driven shaft 26, the left part of the base 1 corresponding to the position above the second driven shaft 26 is rotatably installed with a third driven shaft 27, and the upper part of the base 1 corresponding to the position between the third driven shaft 27 and the pulp cup 2 is rotatably installed with a fourth driven shaft 27 at intervals. The driven shaft 28 and the fifth driven shaft 29 are rotatably mounted on the right side of the base 1 corresponding to the right position of the cup bottom 4. The transmission motor 22 is fixedly mounted on the inner side of the lower part of the base 1 corresponding to the upper left position of the driving shaft 23. The front end of the output shaft of the transmission motor 22 is connected to the rear of the driving shaft 23 through a pulley transmission. The front outer side and the rear outer side of the driving shaft 23 are respectively fixed with the front driving gear 24 and the rear driving gear. The front outer side of the first driven shaft 25, the front outer side of the second driven shaft 26, the front outer side of the third driven shaft 27, the front outer side of the fourth driven shaft 28, the front outer side of the fifth driven shaft 29 and the sixth driven shaft 3 are fixedly mounted on the front outer side of the first driven shaft 25, the front outer side of the second driven shaft 26, the front outer side of the third driven shaft 27, the front outer side of the fourth driven shaft 28, the front outer side of the fifth driven shaft 29 and the sixth driven shaft 3 0 are fixedly mounted on the front outer side thereof, respectively; the first rear driven gear, the second rear driven gear, the third rear driven gear, the fourth rear driven gear, the fifth rear driven gear and the sixth rear driven gear are fixedly mounted on the rear outer side of the first driven shaft 25, the rear outer side of the second driven shaft 26, the rear outer side of the third driven shaft 27, the rear outer side of the fourth driven shaft 28, the rear outer side of the fifth driven shaft 29 and the rear outer side of the sixth driven shaft 30, respectively; the front driving gear 24, the first front driven gear, the second front driven gear The driven gear, the third front driven gear, the fourth front driven gear, the fifth front driven gear and the sixth front driven gear are connected together by the second synchronous belt 31, and the rear driving gear, the first rear driven gear, the second rear driven gear, the third rear driven gear, the fourth rear driven gear, the fifth rear driven gear and the sixth rear driven gear are connected together by the third synchronous belt 32 which has the same structure as the second synchronous belt 31 and is symmetrically distributed. A filter screen 33 is fixedly installed on the outer ring surface of the second synchronous belt 31 on the upper right side, located between the pulp cup 2 and the cup bottom 4, and the rear part of the filter screen 33 is fixedly installed at the corresponding position of the outer ring surface of the third synchronous belt 32.

[0036] The filter screen 33 is an annular screen as required. During use, the transmission motor 22 drives the driving shaft 23, which in turn drives the second synchronous belt 31, the third synchronous belt 32, and the filter screen 33 to move, thereby transporting the mud cake formed in the slurry cup 2 to the mud cake testing assembly. At the same time, it can also provide a testing platform for the mud cake when the mud cake testing assembly tests the thickness and viscosity of the mud cake. By providing the second driven shaft 26, the third driven shaft 27, the fourth driven shaft 28, and the fifth driven shaft 29, the expansion and contraction of the second synchronous belt 31, the third synchronous belt 32, and the filter screen 33 can be increased, facilitating synchronous lifting and lowering with the cup bottom 4. When making the mud cake, filter paper is placed above the filter screen 33 on the upper side of the cup bottom 4 to facilitate filtering the filtrate when pressing the mud cake.

[0037] As attached Figure 1 、 2, 3, 4, 5, 6, the mud cake test assembly includes a test seat 34, a first test frame 35, a second test frame 36, a first test motor 37, a second test motor 38, an electric push rod 39, a test plate 40, a sticking block 45 and a control unit. The test seat 34 located above the filter 33 is fixedly installed on the upper left side of the base 1, and the first test frame 35 is slidably installed on the upper edge of the test seat 34. A test screw hole that passes through the upper and lower parts of the first test frame 35 is provided, and a test screw 42 is screwed into the test screw hole. The first test motor 37 is fixedly installed on the right side of the test seat 34, and the output of the first test motor 37 is The upper end of the output shaft is transmission-connected to the lower end of the test screw 42, a second test frame 36 is fixedly installed on the left rear side of the first test frame 35, a second test motor 38 is fixedly installed on the second test frame 36, a winding post 43 is rotatably installed on the upper part of the second test frame 36, and the right end is transmission-connected to the left end of the output shaft of the second test motor 38, a retracting block 44 is fixedly installed on the lower part of the second test frame 36 corresponding to the position below the winding post 43, and a retracting block 44 is provided on the lower side of the retracting block 44 with a receiving groove opening downward and passing through from left to right, and two threading holes are provided on the upper end of the retracting block 44 at intervals on the left and right sides, and each threading hole is threaded with a thread. A retractable rope 46 is provided, the first end of which is wound several times and fixedly installed at the corresponding position of the winding column 43. The second end of each retractable rope 46 is fixedly installed at the upper side of a sticky block 45 that matches the storage groove. The upper part of each threading hole is provided with an induction magnet 48 that is sleeved on the outside of the retractable rope 46. A thickness probe 47 with its lower end located below the sticky block 45 is fixedly installed on the lower side of the second test frame 36 corresponding to the right position of the retractable block 44. A test plate 40 with its upper side in contact with the upper inner ring surface of the filter screen 33 is provided on the base 1 corresponding to the position between the third driven shaft 27 and the fourth driven shaft 28. The front of the test plate 40 is in contact with the inner ring surface of the filter screen 33. The left side of the top and the left side of the rear are fixedly installed with hinged ears 41 that are rotatably installed with the corresponding position of the third driven shaft 27. An electric push rod 39 is hingedly connected between the lower side of the right part of the test plate 40 and the inner side of the left part of the base 1. Gyroscopes 49 and Hall sensors 50 corresponding to the induction magnets 48 are spaced apart on the left and right sides of the lower left side of the test plate 40. The thickness probe 47, gyroscope 49 and Hall sensor 50 are all electrically connected to the control unit, and the control unit is respectively electrically connected to the first test motor 37, the second test motor 38, the conveying motor 22, the locking motor 10, the electric push rod 39, the drain valve 20 and the waste valve 21.

[0038] According to the requirements, the control unit is a known PLC, the thickness probe 47 is a known conductivity probe, and the second test motor 38 can be a known turbine reduction motor. During use, the mud cake is transported to the bottom of the thickness probe 47 through the filter 33. When the first test motor 37 is working, its output shaft rotates, thereby rotating the test screw 42. The first test frame 35 descends, driving the second test frame 36 to descend. After the second test frame 36 descends, it drives the retracting block 44 to descend, and finally the thickness probe 47 is lowered. When the lower end of the thickness probe 47 contacts the upper side of the mud cake, the two poles at the lower end of the probe are powered on to analyze its conductivity. When the conductivity enters water from air, it will change dramatically. Then, when it enters drilling fluid from water, it will change slightly. The position where the probe descends during the slight change is recorded. The difference generated when the probe reaches the extreme low end is the thickness of the mud cake. After the mud cake is calculated, After the thickness is measured, the second test motor 38 drives the winding column 43 to rotate and release the sticking block 45. After the sticking block 45 falls on the mud cake, the piston rod of the electric push rod 39 extends, so that the right end of the test plate 40 is higher than the left end. The gyroscope 49 records the deflection angle of the test plate 40. At the same time, the Hall sensor 50 calculates the magnetic field of the induction magnet 48. When the magnetic field changes, it means that the sticking block 45 slides and displaces along the surface of the mud cake. At this time, the value of the gyroscope 49, that is, the angle generated by the test plate 40, is recorded, so as to convert the viscosity coefficient of the mud cake, and the thickness and viscosity coefficient of the mud cake can be quickly obtained. The test is quick and convenient, with a high degree of automation. The sticking block 45 can also be replaced according to needs, and the expansion performance is stronger.

[0039] As attached Figure 1 、 2As shown in Figures 3, 4, 5 and 6, the cleaning assembly includes a rotary joint 51, a central tube 52, a cleaning motor 53, a cleaning box 54 and a cleaning pipe 55. A rotary joint 51 is provided above the cup cover 3. The lower end of the rotary joint 51 is sealed and rotatably installed with a central tube 52 with a cylindrical structure with a closed lower end. The lower end of the central tube 52 is sealed and passes through the grouting hole and is located on the inner side of the lower part of the slurry cup 2. There are radially penetrating cleaning holes discretely distributed on the outer side of the lower part of the central tube 52. A cleaning motor 53 electrically connected to the control unit is fixedly installed on the base 1 corresponding to the right position of the cup cover 3. The upper end of the output shaft of the cleaning motor 53 is connected to the central tube 52. The upper parts are connected together through a pulley transmission. The first test frame 35 is rotatably installed with a front-to-back first rotating shaft 56 on the lower left side. The outer side of the left part of the first rotating shaft 56 is fixedly installed with the upper right end of the cleaning box 54 sleeved on the outer side of the lower part of the retracting block 44. The upper part of the cleaning box 54 is fixedly connected with a cleaning pipe 55. The outer side of the lower part of the first rotating shaft 56 is fixedly installed with a first turning arm 64 that is tilted in a left-higher-right-lower shape. The right side of the first turning arm 64 is fixedly installed with a second rotating shaft 57 parallel to the first rotating shaft 56. The left side of the rear of the test seat 34 corresponding to the position above the second rotating shaft 57 is rotatably installed with a left-to-right third rotating shaft. The rotating shaft 58 is fixedly mounted on the outer side of the left portion of the third rotating shaft 58 with a first gear 60. The upper portion of the test seat 34 corresponding to the position above the third rotating shaft 58 is rotatably mounted with a fourth rotating shaft 59 parallel to the third rotating shaft 58. The outer side of the left portion of the fourth rotating shaft 59 is fixedly mounted with a second gear 61 meshing with the first gear 60. A fixed sleeve 62 is fixedly mounted on the left side of the second gear 61. At least one toggle tooth 63 is evenly spaced along the circumference of the outer side of the fixed sleeve 62. A second inverted Z-shaped turning arm 65 is mounted on the outer side of the left portion of the third rotating shaft 58 corresponding to the left side of the second gear 61. The other end of the second turning arm 65 is fixedly mounted on the outer side of the left portion of the third rotating shaft 58. A first connecting arm 66 is mounted on the outer side, and the lower end of the first connecting arm 66 is hingedly connected to a second connecting arm 67 whose lower end is mounted on the outer side of the rear portion of the second rotating shaft 57. A pawl 68 is fixedly installed on the upper part of the first test frame 35, which can make the second gear 61 rotate in one direction. A limiting groove opening facing backward is provided on the lower rear side of the second test frame 36 corresponding to the position below the pawl 68. A push rod 69 is rotatably installed in the limiting groove, the rear end of which can rise and fall with the second test frame 36 to make one of the shifting teeth 63 swing and thus rotate the second gear 61. The upper front end of the push rod 69 contacts the bottom wall of the front part of the limiting groove.

[0040] According to the needs, four toggle teeth 63 are evenly spaced along the circumference of the outer side of the fixed sleeve 62. During use, after the test work is completed, water can be injected into the slurry cup 2 through the central tube 52. By setting the cleaning motor 53, the central tube 52 can be driven to rotate, so that clean water is evenly sprayed on the inner wall of the slurry cup 2, the cup cover 3 and the cup bottom 4 through the cleaning hole, which can be thoroughly cleaned. Dry air can also be injected into the central tube 52 to dry the inner wall of the slurry cup 2, the cup cover 3 and the cup bottom 4, thereby improving the cleaning efficiency and facilitating the next test. By setting the cleaning box 54 and the cleaning tube 55, the thickness probe 47, the retractable block 44 and the sticking block 45 can be cleaned after the test, which is convenient for the next test of the mud cake parameters. The thickness probe 47 and the sticking block 45 can be tested and protected. By setting the pawl 68, the push rod 69 lifts and swings the front lower toggle tooth 63 after the second test frame 36 rises, so that the second gear 61 and the first gear 60 rotate, and finally the upper left end of the cleaning box 54 is swung downward, so that the mud cake can be tested after the thickness probe 47 and the sticking block 45 are lowered. The upper front end of the push rod 69 contacts the bottom wall of the front part of the limiting groove and the setting of the pawl 68. During the descent of the thickness probe 47, the push rod 69 can avoid driving the toggle tooth 63 to rotate the second gear 61 in the opposite direction, thereby improving the reliability of the operation.

[0041] As attached Figure 1 、 2 As shown in Figure 6, the inner wall of the lower end of the slurry cup 2 is a conical surface with a small upper part and a large lower part. The outer side of the cup bottom 4 matches the inner side of the lower end of the slurry cup 2. An annular liquid collecting box 70 is fixedly installed on the lower side of the cup bottom 4. There is an annular groove with an opening upward in the liquid collecting box 70. The outer diameter of the annular groove is larger than the outer diameter of the cup bottom 4. Several drainage pipes 71 are fixedly connected to the bottom of the liquid collecting box 70 at intervals. The lifting drive mechanism includes a lifting screw 73, a mounting frame 74, a support plate 75, a slide rail 76, a guide rail 77 and a lifting motor 72 electrically connected to the control unit. An L-shaped filter element is fixedly installed on the lower side of the cup bottom 4 corresponding to the outer position of the filter tube 18. The support plate 75 is provided with a threaded through hole at the lower part of the support plate 75. A mounting bracket 74 is fixedly installed in the base 1 at the position below the support plate 75. A lifting motor 72 is fixedly installed on the mounting bracket 74. The upper end of the output shaft of the lifting motor 72 is transmission-connected with the lower end of the lifting screw rod 73 screwed into the threaded through hole at the upper part. A plurality of slide rails 76 are evenly distributed along the circumference of the outer side of the liquid collecting box 70. The upper end of each slide rail 76 is provided with a guide groove that runs through from top to bottom and opens outward. A guide rail 77 matching the guide groove is fixedly installed in the base 1 corresponding to the position of each slide rail 76.

[0042] According to the requirements, two slide rails 76 are symmetrically distributed radially on the front and back sides of the outer side of the liquid collecting box 70. During use, by providing the support plate 75 and the lifting motor 72, the support area of the cup bottom 4 can be increased, and the stability of the cup bottom 4 during the lifting process can be enhanced. After the cup bottom 4 is raised, it can improve the sealing strength after being sealed with the lower end of the slurry cup 2. By providing the slide rail 76 and the guide rail 77, the accuracy of the cup bottom 4 during the rising and lowering process can be improved, which is more convenient for sealing the cup bottom 4 and the slurry cup 2. At the same time, the integrity of the mud cake can be ensured during the lowering process of the cup bottom 4, and the accuracy of subsequent measurement of the mud cake can be improved. By providing the liquid collecting box 70, after the mud cake is made, the cup bottom 4 is lowered, and the excess drilling fluid in the slurry cup 2 can be collected. The outer diameter of the annular groove is larger than the outer diameter of the cup bottom 4, which can prevent the drilling fluid from splashing out from the outside of the cup cover 3. When in use, a connecting hose can be fixed at the lower end of each drainage pipe 71 to collect the waste liquid, thereby optimizing the working environment of the present invention. There is an annular groove with an upward opening in the liquid collecting box 70. Such a setting can not only protect the lifting motor 72, but also prevent the liquid from flowing into the measuring cylinder 19 and affecting the test data.

[0043] As attached Figure 1 、 2 As shown in Figure 6, the mud cake generating assembly also includes a pressure relief valve and a liquid level gauge. A pressure relief hole and a positioning hole are provided at intervals on the upper end of the cup cover 3. The lower end of the pressure relief valve is sealed in the pressure relief hole, and the upper part of the liquid level gauge is sealed in the positioning hole. Both the pressure relief valve and the liquid level gauge are electrically connected to the control unit.

[0044] The pressure relief valve and liquid level gauge are both known technologies. In use, after the mud cake is formed, the pressure relief valve can be used to release the high pressure in the slurry cup 2. The liquid level gauge can be used to control the volume of drilling fluid injected into the slurry cup 2, providing convenient, highly automated, and precise control.

[0045] Example 2: As shown in the attached Figure 1 、 2 As shown in Figures 3, 4, 5, and 6, the test method of the fully automatic medium-pressure water loss performance measuring instrument includes a medium-pressure water loss measurement method, a mud cake thickness measurement method, and a mud cake viscosity coefficient measurement method:

[0046] Medium-pressure water loss measurement method: First, control the drilling fluid pump to inject the drilling fluid into the slurry cup 2. The injected volume is about 240 ml. The liquid level is determined by the liquid level gauge. At this time, the slurry cup 2 and the cup cover 3 are in a sealed state. The locking is achieved by four locking screws 6. Driven by the locking motor 10, the cup cover 3 and the slurry cup 2 are locked to achieve medium pressure and no air leakage. After the drilling fluid is injected, the high-pressure air pump is used to inject air into the slurry cup 2 through the central tube 52 in the center of the cup cover 3 to make the pressure reach 0.69 MPa, and then the exhaust is opened. Liquid valve 20 starts timing when the first drop of filtrate drips through the lower end of the filter tube 18, stops timing after 7.5 minutes, and records the liquid level in the measuring cylinder 19. If there is too much filtrate, it is necessary to control the filtrate level in the measuring cylinder 19 to reach a certain position, control the waste valve 21 to complete a switch within 0.5 seconds, re-read the liquid level height, and continue to drip the filtrate. The liquid level height is recorded again. If the filtrate level in the measuring cylinder 19 exceeds the specified position again, repeat the above steps, and finally record all values to calculate the total volume of the filtrate.

[0047] Mud cake thickness measurement method: After the medium-pressure water loss measurement is completed, the pressure relief valve is controlled and opened by the control unit to release the air pressure in the slurry cup 2. At the same time, the locking motor 10 drives the locking screw 6 to rotate in the opposite direction, and the slurry cup 2 and the cup cover 3 are opened. At the same time, the lifting motor 72 drives the lifting screw 73 to rotate, so that the cup bottom 4 drops another 20 mm. The excess drilling fluid will flow into the liquid collecting box 70 along the four sides of the cup bottom 4. Then, the drain pipe 71 releases the drilling fluid. On the lower side of the slurry cup 2, the mud cake after the excess drilling fluid is released is on the filter paper of the filter screen 33. Driven by the second synchronous belt 31 and the third synchronous belt 32, the filter screen 33 moves to the left and stops below the cleaning box 54. The first test motor 37 drives the test screw 42 to drive the first test frame 35 to slide upward. After the push rod 69 rises with the second test frame 36, the front lower toggle gear 63 is lifted, so that the second gear 6 1. The first gear 60 rotates, eventually swinging the upper left end of the cleaning box 54 downward. Then, the first test motor 37 drives the test screw 42 to slide the first test frame 35 downward. The lower rear end of the push rod 69 contacts the upper side of the toggle tooth 63, rotates upward, and then retracts. The first test frame 35 continues to move downward. After the push rod 69 rotates past the toggle rod, it returns to its original position under the action of gravity. Then, the second test motor 38 drives the winding column 43 to rotate, causing the thickness probe 47 and the sticking block 45 to descend simultaneously. The two poles at the lower end of the thickness probe 47 are energized to analyze their conductivity. When the conductivity changes from air to water, it will change dramatically. Then, when the conductivity changes from water to drilling fluid, it will change slightly. The difference between the position of the thickness probe 47 when the slight change occurs (the upper surface of the mud cake) and the position when the thickness probe 47 reaches the lowest point (the lower surface of the mud cake) is recorded. This is the value used to calculate the thickness of the mud cake.

[0048] Mud cake viscosity coefficient measurement method: After calculating the mud cake thickness, the second test motor 38 drives the winding column 43 to rotate, releasing the viscosity block 45. After the viscosity block 45 falls on the mud cake, the piston rod of the electric push rod 39 extends, making the right end of the test plate 40 higher than the left end. The gyroscope 49 records the deflection angle of the test plate 40. At the same time, the Hall sensor 50 calculates the magnetic field of the induction magnet 48. When the magnetic field changes, it means that the viscosity block 45 slides and displaces along the surface of the mud cake. At this time, the value of the gyroscope 49, that is, the angle generated by the test plate 40, is recorded, and the viscosity coefficient of the mud cake is converted (slider measurement method).

[0049] Cleaning and drying of the whole machine: After the mud cake test is completed, the second test motor 38 drives the winding column 43, pulls the sticky block 45 up and snaps it into the storage groove at the lower end of the retracting block 44, and the first test motor 37 drives the test screw 42 to drive the first test frame 35 to rise to the top again, and the push rod 69 drives another toggle rod to rise so that the cleaning box 54 is reset and flipped up, and the first test motor 37 drives the test screw 42 to drive the first test frame 35 to descend again, so that the retracting block 44 and the thickness probe 47 are lowered into the cleaning box 54, and finally, the cleaning pipe 55 starts to spray water to clean the sticky block 45 and the thickness probe 47. After cleaning, the first test frame 35 rises to the top again, and the cleaning is completed. The washing box 54 is flipped up, and the first test motor 37 drives the test screw 42 to drive the first test frame 35 to descend again, so that the retracting block 44 and the thickness probe 47 are lowered to the preparation height. The second synchronous belt 31 and the third synchronous belt 32 pull the filter screen 33 to move to the left, and the water pump injects clean water into the central cylinder 52. At the same time, the central cylinder 52 is driven to rotate by the cleaning motor 53. The clean water passes through the cleaning hole on the central cylinder 52 to clean the inner wall of the pulp cup 2. While cleaning the pulp cup 2, the measuring cylinder 19 and the waste liquid valve 21 are cleaned. The outflowing cleaning liquid flows into the liquid collecting box 70 below. After repeated several times, the water vapor pump switches the input path and inputs hot air to dry the pulp cup 2 and the measuring cylinder 19. After drying, the filter screen 33 drives the new filter paper to move between the pulp cup 2 and the cup bottom 4. The cup bottom 4 rises and clamps the filter paper. The colloid around the edge of the filter paper can serve as a sealing ring. At the same time, the locking motor 10 drives the locking screw 6 to seal the pulp cup 2 and the cup cover 3. As the experiment proceeds, the used filter paper and filter mesh 33 will be discharged from the bottom of the base 1.

[0050] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or removed according to actual needs to meet the requirements of different situations.

Claims

1. A fully automatic medium pressure water loss performance measuring instrument, characterized in that The utility model comprises a base, a mud cake generating assembly, a filter paper conveying assembly, a mud cake testing assembly and a cleaning assembly. The base is provided with a mud cake generating assembly for generating mud cake from drilling fluid and a mud cake testing assembly for testing thickness and viscosity coefficient of the mud cake from right to left. The base is also provided with a filter paper conveying assembly for conveying the mud cake generated by the mud cake generating assembly to the mud cake testing assembly. A cleaning assembly is provided on the upper side of the filter paper conveying assembly. The mud cake generating assembly includes a slurry cup, a cup cover, a cup bottom, a locking screw, a locking gear, a locking motor and a gear ring. A cup cover with a grouting hole extending through the center is fixedly installed on the upper right side of the base. A slurry cup with a hollow structure is provided under the cup cover. At least three connecting ears are distributed along the circumference on the outer side of the upper end of the slurry cup. Each connecting ear has a locking threaded through hole on the upper end. A locking screw is screwed in each locking threaded through hole. A fixing plate is fixedly installed on the outer side of the cup cover corresponding to each connecting ear position. The upper end of each locking screw is rotatably installed with the fixing plate at the corresponding position. A locking gear is fixedly installed on the outer side of the upper part of the locking screw corresponding to the lower side of each fixing plate. Several fixing ears are evenly distributed along the circumference on the outer side of the middle of the slurry cup. A fixing ring is fixed on the outer side of the lower side of the slurry cup. A connecting through hole corresponding to the fixing ear is provided on the lower side of the fixing ring. A guide hole extending through the upper and lower sides is provided on the upper side of the fixing ear corresponding to each connecting through hole position. Each guide hole is fitted with a limiting block that is fixed after the lower end passes through the corresponding connecting through hole. The transmission gear of said sliding shaft is fixedly mounted on the outer side of each sliding shaft at the upper side of each fixed ear, and a compression spring is provided between the outer side of the sliding shaft at the lower position of each fixed ear and the corresponding position on the upper side of the fixed ring. A locking motor is fixedly mounted on the middle of the base corresponding to the leftmost sliding shaft position, and a locking driving gear is fixedly mounted on the outer side of the output shaft of the locking motor, and the locking driving gear is connected to the upper part of the leftmost guide gear through a first synchronous belt transmission. The outer side of the lower part of the slurry cup is sleeved with a gear ring that meshes with all locking gears and all guide gears. The lower side of the slurry cup is provided with a corresponding cup bottom, and the right part of the filter paper transmission assembly is provided between the upper side of the cup bottom and the lower side of the slurry cup. The lower part of the base is provided with a lifting driving mechanism that can drive the cup bottom to move up and down, and a filter hole is provided through the bottom of the cup, and a filter tube is sealed and fixedly installed in the filter hole. A drain valve is provided on the filter tube, and a measuring cylinder is fixedly mounted on the inner side of the lower part of the base corresponding to the lower side of the filter tube, and a drain hole is provided at the lower end of the measuring cylinder, and a waste liquid valve that can open and close the drain hole is provided at the lower part of the base; The filter paper transmission assembly includes a transmission motor, a driving shaft, a second synchronous belt, a third synchronous belt and a filter screen. The lower part of the base corresponding to the lower right position of the cup bottom is rotatably installed with a forward and backward driving shaft, the left part of the base corresponding to the left position of the driving shaft is rotatably installed with a first driven shaft, the middle part of the base corresponding to the upper left position of the first driven shaft is rotatably installed with a second driven shaft, the left part of the base corresponding to the position above the second driven shaft is rotatably installed with a third driven shaft, the upper part of the base corresponding to the position between the third driven shaft and the pulp cup is rotatably installed with a fourth driven shaft and a fifth driven shaft. The sixth driven shaft is rotatably installed on the right side of the base at the right position of the bottom of the cup, and a transmission motor is fixedly installed on the inner side of the lower part of the base corresponding to the upper left position of the driving shaft. The front end of the output shaft of the transmission motor is connected to the rear of the driving shaft through a pulley drive. The front outer side and the rear outer side of the driving shaft are respectively fixed with a front driving gear and a rear driving gear. The front outer side of the first driven shaft, the front outer side of the second driven shaft, the front outer side of the third driven shaft, the front outer side of the fourth driven shaft, the front outer side of the fifth driven shaft and the front outer side of the sixth driven shaft are respectively fixed with the first front driven gear , the second front driven gear, the third front driven gear, the fourth front driven gear, the fifth front driven gear and the sixth front driven gear, the first rear driven gear, the second rear driven gear, the third rear driven gear, the fourth rear driven gear, the fifth rear driven gear and the sixth rear driven gear are fixedly installed on the rear outer side of the first driven shaft, the rear outer side of the second driven shaft, the rear outer side of the third driven shaft, the rear outer side of the fourth driven shaft, the rear outer side of the fifth driven shaft and the rear outer side of the sixth driven shaft respectively, the front driving gear, the first front driven gear, the second front driven gear, the third front driven gear, the fourth front driven gear, the fifth rear driven gear and the sixth rear driven gear The gear, the fourth front driven gear, the fifth front driven gear and the sixth front driven gear are connected together through the second synchronous belt transmission, and the rear driving gear, the first rear driven gear, the second rear driven gear, the third rear driven gear, the fourth rear driven gear, the fifth rear driven gear and the sixth rear driven gear are connected together through the third synchronous belt transmission which has the same structure as the second synchronous belt and is symmetrically distributed. A filter screen is fixedly installed on the outer ring surface of the second synchronous belt on the upper right side between the pulp cup and the bottom of the cup, and the rear part of the filter screen is fixedly installed on the corresponding position of the outer ring surface of the third synchronous belt.

2. The fully automatic medium pressure water loss performance measuring instrument according to claim 1 is characterized in that The mud cake test assembly includes a test seat, a first test frame, a second test frame, a first test motor, a second test motor, an electric push rod, a test plate, a sticking block and a control unit. The test seat located above the filter screen is fixedly installed on the upper left side of the base, and the first test frame is slidably installed on the upper edge of the test seat. A test screw hole that passes through the upper and lower parts of the first test frame is provided, and a test screw is screwed in the test screw hole. The first test motor is fixedly installed on the right side of the test seat, and the upper end of the output shaft of the first test motor is transmission-connected with the lower end of the test screw. The second test frame is fixedly installed on the left rear side of the first test frame, and the second test motor is fixedly installed on the second test frame. A winding post with a right end transmission-connected with the left end of the output shaft of the second test motor is rotatably installed on the upper side of the second test frame, and a retracting block is fixedly installed on the lower side of the second test frame corresponding to the position below the winding post, and a receiving groove with an opening downward and passing through the left and right sides is provided on the lower side of the retracting block. Two threading holes with lower ends extending to the bottom wall of the receiving groove are provided at intervals on the left and right sides of the upper end of the retracting block. Each threading hole is provided with a retractable rope, the first end of which is wrapped around several times and then fixedly installed with the corresponding position of the winding column. The second end of each retractable rope is fixedly installed with the upper side of the sticky block that matches the upper storage groove. The upper part of each threading hole is provided with an induction magnet sleeved on the outside of the retractable rope. A thickness probe with the lower end located below the sticky block is fixedly installed on the lower side of the second test frame corresponding to the right position of the retractable block. A test plate with the upper side in contact with the upper inner ring surface of the filter screen is provided on the base corresponding to the position between the third driven shaft and the fourth driven shaft. The test plate is fixedly installed with hinged ears rotatably installed with the corresponding position of the third driven shaft on the front left and the rear left sides. An electric push rod is hingedly connected between the lower right side of the test plate and the inner left side of the base. Gyroscopes and Hall sensors corresponding to the induction magnets are provided at intervals on the left and right sides of the lower left side of the test plate. The thickness probe, gyroscope and Hall sensor are all electrically connected to the control unit, and the control unit is electrically connected to the first test motor, the second test motor and the transmission motor respectively.

3. The fully automatic medium pressure water loss performance measuring instrument according to claim 2 is characterized in that The cleaning assembly includes a rotary joint, a center cylinder, a cleaning motor, a cleaning box and a cleaning pipe. A rotary joint is provided above the cup cover. The lower end of the rotary joint is sealed and rotatably installed with a center cylinder of a cylindrical structure with a closed lower end. The lower end of the center cylinder is sealed and rotatably passed through the grouting hole and is located on the inner side of the lower part of the slurry cup. There are radially penetrating cleaning holes discretely distributed on the lower outer side of the center cylinder. A cleaning motor electrically connected to the control unit is fixedly installed on the base corresponding to the right position of the cup cover. The upper end of the output shaft of the cleaning motor is connected to the upper part of the center cylinder through a pulley transmission. The first test frame is rotatably installed with a front-to-back first rotating shaft on the lower left side. The outer side of the left side of the first rotating shaft is fixedly installed with the upper right end of the cleaning box which is sleeved on the outer side of the lower part of the retracting block. The upper part of the cleaning box is fixedly connected with a cleaning pipe. The outer side of the lower part of the first rotating shaft is fixedly installed with a first turning arm that is inclined with the left higher and the right lower. A second rotating shaft parallel to the first rotating shaft is fixedly installed on the right side of the first turning arm. The left side of the rear of the test seat corresponding to the position above the second rotating shaft is rotatably installed with a left-right third rotating shaft. The first gear is fixedly installed on the outer side of the left part of the third rotating shaft, and the fourth rotating shaft is rotatably installed on the upper side of the test seat corresponding to the position above the third rotating shaft, and the second gear is meshed with the first gear, and the second gear is fixedly installed on the outer side of the left part of the fourth rotating shaft, and a fixed sleeve is fixedly installed on the left side of the second gear, and at least one toggle tooth is evenly distributed along the circumference of the outer side of the fixed sleeve. The other end of the second toggle arm is mounted on the outer side of the left part of the third rotating shaft, and the first connecting arm is hingedly connected to the second connecting arm at the lower end of the first connecting arm, which is mounted on the outer side of the rear of the second rotating shaft. A pawl that can make the second gear rotate unidirectionally is fixedly installed on the upper side of the first test frame, and a limiting groove with a rearward opening is provided on the lower side of the rear of the second test frame corresponding to the position below the pawl. A push rod with a rear end that can rise and fall with the second test frame so that one of the toggle teeth swings and thus the second gear rotates is rotatably installed in the limiting groove, and the upper side of the front end of the push rod contacts the front bottom wall of the limiting groove.

4. The fully automatic medium pressure fluid loss performance measuring instrument according to claim 2 or 3, characterized in that The outer wall of the bottom of the slurry cup is a conical surface that is smaller at the top and larger at the bottom. The outer side of the cup bottom matches the inner side of the lower end of the slurry cup. An annular liquid collecting box is fixedly installed on the lower side of the cup bottom, and an annular groove opening upward is provided in the liquid collecting box. The outer diameter of the annular groove is larger than the outer diameter of the cup bottom. Several drainage pipes are fixedly connected at intervals at the bottom of the liquid collecting box. The lifting drive mechanism includes a lifting screw, a mounting frame, a support plate, a slide rail, a guide rail and a lifting motor electrically connected to the control unit. An L-shaped support plate is fixedly installed on the lower side of the cup bottom corresponding to the outer position of the filter tube. A threaded through hole is provided at the lower part of the support plate. A mounting frame is fixedly installed in the base corresponding to the position below the support plate. The lifting motor is fixedly installed on the mounting frame. The upper end of the output shaft of the lifting motor is transmission-connected to the lower end of the lifting screw screw screwed in the threaded through hole on the upper side. Several slide rails are evenly distributed along the circumference of the outside of the liquid collecting box, and the upper end of each slide rail is provided with a guide groove that runs through up and down and opens outward. A guide rail matching the guide groove is fixedly installed in the base corresponding to each slide rail position.

5. The fully automatic medium pressure water loss performance measuring instrument according to claim 2 or 3, characterized in that The mud cake generating assembly also includes a pressure relief valve and a liquid level gauge. A pressure relief hole and a positioning hole are provided at intervals on the upper end of the cup cover. The lower end of the pressure relief valve is sealed in the pressure relief hole, and the upper end of the liquid level gauge is sealed in the positioning hole. Both the pressure relief valve and the liquid level gauge are electrically connected to the control unit.

6. The fully automatic medium pressure water loss performance measuring instrument according to claim 4 is characterized in that The mud cake generating assembly also includes a pressure relief valve and a liquid level gauge. A pressure relief hole and a positioning hole are provided at intervals on the upper end of the cup cover. The lower end of the pressure relief valve is sealed in the pressure relief hole, and the upper end of the liquid level gauge is sealed in the positioning hole. Both the pressure relief valve and the liquid level gauge are electrically connected to the control unit.

7. A testing method of the fully automatic medium pressure fluid loss performance measuring instrument according to claim 5 or 6, characterized in that Including medium pressure water loss measurement method, mud cake thickness measurement method and mud cake viscosity coefficient measurement method; The medium-pressure water loss measurement method is carried out as follows: filter paper is placed on the filter screen at the bottom of the cup, the lifting motor drives the cup bottom to move up and seal it with the lower end of the slurry cup, the drain valve is closed, and drilling fluid is injected into the slurry cup through the drilling fluid pump, and the locking motor is started. The locking motor drives the gear ring and the locking screw to rotate, and the locking screw drives the slurry cup to move up and seal it with the cup cover, and then the high-pressure air pump is used to inject air into the slurry cup through the center tube and pressurize it, and then the drain valve is opened. When the first drop of filtrate drips through the lower end of the filter tube, the timing starts, and the liquid level in the measuring cylinder is recorded when the specified time is up. If there is too much filtrate in the measuring cylinder, after the filtrate liquid level in the measuring cylinder reaches a certain position, the waste valve is quickly opened and closed, and the filtrate continues to drip after re-reading the liquid level height, and the liquid level height is recorded again. If the filtrate liquid level in the measuring cylinder exceeds the specified position again, the above actions are repeated, and finally all values are recorded to calculate the total volume of the filtrate; The mud cake thickness measurement is carried out as follows: after the medium-pressure water loss measurement is completed, the pressure relief valve is opened to release the air pressure in the slurry cup. At the same time, the locking motor drives the locking screw to rotate in the opposite direction, the slurry cup and the cup cover are opened, and the lifting motor drives the lifting screw to rotate, so that the bottom of the cup drops, and the excess drilling fluid will flow into the liquid collecting box along the four sides of the cup bottom. On the lower side of the slurry cup, the mud cake after the excess drilling fluid is released is on the filter paper of the filter screen. Driven by the second and third synchronous belts, the filter screen stops when it moves to the left below the cleaning box. The first test motor drives the test screw to drive the first test frame to slide upward , the push rod rises with the second test frame, lifting the toggle gear at the front bottom, causing the second gear and the first gear to rotate, and finally swinging the upper left end of the cleaning box downward. Then, the first test motor drives the test screw to drive the first test frame to slide downward, causing the thickness probe to descend. The two poles at the lower end of the thickness probe are energized to analyze its conductivity. When the conductivity enters water from air, it will change dramatically. Then, when the conductivity enters drilling fluid from water, it will change slightly. The difference between the position where the thickness probe descends during the slight change and the position when the thickness probe reaches the lowest end is the calculated thickness of the mud cake. The viscosity coefficient of the mud cake is measured as follows: after calculating the thickness of the mud cake, the second test motor drives the winding column to rotate, releasing the viscosity block. After the viscosity block falls on the mud cake, the piston rod of the electric push rod extends, making the right end of the test plate higher than the left end. The gyroscope records the deflection angle of the test plate. At the same time, the Hall sensor calculates the magnetic field of the induction magnet. When the magnetic field changes, it means that the viscosity block slides and displaces along the surface of the mud cake. At this time, the value of the gyroscope is recorded, which is the angle generated by the test plate, and the viscosity coefficient of the mud cake is converted.

8. The testing method according to claim 7, characterized in that After the measurement work is completed, the cleaning and drying work are carried out. The cleaning work is carried out as follows: After the viscosity coefficient measurement is completed, the second test motor drives the winding column to pull the viscosity block up and clamp it into the storage groove at the lower end of the retractable block. The first test motor drives the test screw to drive the first test frame to rise to the top again. The push rod drives another toggle rod to rise so that the cleaning box is reset and flipped up. The first test motor drives the test screw to drive the first test frame to descend again, so that the retractable block and thickness probe are lowered into the cleaning box. Finally, the cleaning pipe is connected to the water source and starts to spray water to clean the viscosity block and thickness probe. The needle is cleaned. After cleaning, the first test frame rises to the top again, the cleaning box flips up, and the first test motor drives the test screw to drive the first test frame to drop again, so that the retractable block and the thickness probe drop to the preparation height. At the same time, the second synchronous belt and the third synchronous belt pull the filter to move to the left, and the water pump injects clean water into the central cylinder. The central cylinder is driven to rotate by the cleaning motor. The clean water cleans the inner wall of the slurry cup through the cleaning hole on the central cylinder. The drain valve is opened. While cleaning the slurry cup, the measuring cylinder and the waste liquid valve are cleaned. The cleaned liquid flows into the liquid collecting box below. The drying work is carried out as follows: After the cleaning work is repeated many times, the water vapor pump inputs hot air into the central cylinder, and the hot air flows through the slurry cup, filter tube, measuring cylinder and waste liquid valve in turn for drying. After drying, the filter screen drives the new filter paper to move between the slurry cup and the cup bottom. The cup bottom rises and clamps the filter paper. At the same time, the locking motor drives the locking screw to seal the slurry cup and the cup cover.

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