Rotational viscometer and drilling fluid measurement system

Abstract

A rotational viscometer (301) and a drilling fluid measurement system. The rotational viscometer (301) comprises a cup body assembly and a measurement assembly. The cup body assembly is provided with a measurement cavity; a cleaning inlet (31, 51, 62) and a cleaning outlet (71) which are communicated with the measurement cavity are formed in the cup body assembly; the cup body assembly is further provided with a cleaning channel used for cleaning the measurement assembly; and the cleaning channel is communicated with the cleaning inlet (31, 51, 62). The measurement assembly comprises an inner rotating cylinder (4) and an outer rotating cylinder (6) which are arranged in the measurement cavity. When measurement is completed, a cleaning liquid can be input through the cleaning inlet (31, 51, 62) to clean the measurement assembly, so that cleaning is performed without disassembling the rotational viscometer (301) and is thus highly convenient. During cleaning, the outer rotating cylinder (6) is rotated, so that residual solid and viscous substances left in the measurement cavity and left on the inner rotating cylinder (4) and the outer rotating cylinder (6) are flushed away; and cleaning gas can also be blown into the measurement cavity through the cleaning channel, so that the residual liquid substances left in the measurement cavity and left on the inner rotating cylinder (4) and the outer rotating cylinder (6) are blown away.

Description

A rotary viscosity measuring instrument and drilling fluid measuring system Technical Field

[0001] The invention relates to the technical field of viscosity testing, in particular to a rotational viscosity measuring instrument. Background Art

[0002] In the field of downhole construction, rheological parameter testing and analysis of drilling fluids or other fluids is required. Existing testing tools include six-speed rotary viscometers. Liquid is placed in the gap between two concentric annuli. A motor, through a transmission, drives the outer cylinder to rotate at a constant speed. The viscosity of the measured liquid acts on the inner cylinder, generating a certain torque. This torque, in turn, causes the inner cylinder, which is connected to a torsion spring, to rotate at a certain angle. The magnitude of this rotational angle is proportional to the viscosity of the liquid, thus converting the viscosity measurement of the liquid into the rotational angle measurement of the inner cylinder.

[0003] In existing testing equipment, after the test is completed, the viscometer needs to be disassembled to clean the liquid accumulated on the sampling cup and the inner and outer cylinders, which is a very troublesome cleaning process.

[0004] Summary of the Invention

[0005] The present invention aims to solve one of the problems in the prior art and provides a rotational viscosity measuring instrument and a drilling fluid measuring system.

[0006] The technical solution is as follows: a rotational viscosity measuring instrument,

[0007] It includes a cup body component and a measuring component;

[0008] The cup assembly has a measuring cavity, and is provided with a cleaning inlet and a cleaning outlet communicating with the measuring cavity. The cup assembly is also provided with a cleaning channel for cleaning the measuring assembly, and the cleaning channel is communicated with the cleaning inlet;

[0009] The measuring assembly comprises an inner rotating cylinder and an outer rotating cylinder, which are arranged in the measuring cavity.

[0010] The working principle and beneficial effects of the present invention are as follows: Because the cup assembly also includes a cleaning channel for cleaning the measuring assembly, after measurement is completed, cleaning fluid can be introduced through the cleaning inlet to clean the measuring assembly, eliminating the need to disassemble the measuring instrument for cleaning, which is very convenient. During cleaning, the outer drum is rotated to rinse away residual solid and viscous materials within the measuring chamber, the inner drum, and the outer drum. Cleaning gas can also be blown into the measuring chamber through the cleaning channel to remove residual liquid materials within the measuring chamber, the inner drum, and the outer drum.

[0011] On the basis of the above technical solution, the present invention can also be improved as follows.

[0012] Furthermore, the cup assembly includes a measuring cup, a base and a top seat, which together form the measuring cavity;

[0013] One end of the inner drum is connected to one end of the inner drum shaft, and the other end of the inner drum shaft passes through the top seat and is connected to the detection component; one end of the outer drum is connected to one end of the transmission shaft, and the other end of the transmission shaft passes through the base and is connected to the drive structure;

[0014] The cleaning channel includes a side cleaning channel, which is arranged on the side wall of the measuring cup body and is used for blowing the inner drum and the outer drum. The cleaning inlet includes a first inlet, which is connected to the side cleaning channel.

[0015] The beneficial effect of adopting the above further solution is that the side channels can cover most areas of the inner drum and the outer drum, and can perform relatively complete cleaning of the inner drum and the outer drum.

[0016] On the basis of the above technical solution, the present invention can also be improved as follows.

[0017] Furthermore, the side cleaning channel has a first flushing port, which is a narrow slit flushing port arranged in the axial direction of the measuring cup body.

[0018] The beneficial effect of adopting the above-mentioned further scheme is that the cleaning liquid can form a high-speed fluid at the narrow slit blowing port, which can strongly clean the residual substances in the measuring cavity, on the inner rotor and on the outer rotor, thereby improving the cleaning effect; at the same time, when performing air blowing cleaning, the cleaning gas can also form a high-speed airflow at the narrow slit blowing port, which can strongly blow away the residual substances in the measuring cavity, on the inner rotor and on the outer rotor.

[0019] On the basis of the above technical solution, the present invention can also be improved as follows.

[0020] Furthermore, the purging range of the first purging port exceeds the range of the inner drum and the outer drum in the axial direction of the measuring cup.

[0021] The beneficial effect of adopting the above further solution is that the purging range of the first purging port exceeds the axial range of the inner drum and the outer drum of the measuring cup, ensuring complete cleaning coverage of the inner drum and the outer drum.

[0022] On the basis of the above technical solution, the present invention can also be improved as follows.

[0023] Furthermore, the cleaning channel includes a bottom cleaning channel, which is provided on the transmission shaft and is used for blowing the inner drum and the outer drum from the bottom. The cleaning inlet includes a second inlet, which is connected to the bottom cleaning channel.

[0024] The beneficial effect of adopting the above further solution is that the bottom cleaning channel can locally clean the bottom of the inner drum and the inner bottom of the outer drum.

[0025] On the basis of the above technical solution, the present invention can also be improved as follows.

[0026] Furthermore, the bottom cleaning channel has a second blowing port, which is arranged on the transmission shaft and is a nozzle structure.

[0027] The beneficial effect of adopting the above further solution is that the second purging port is configured as a nozzle structure, which can powerfully clean and purge the bottoms of the inner and outer drums.

[0028] On the basis of the above technical solution, the present invention can also be improved as follows.

[0029] Furthermore, the cleaning channel includes a top cleaning channel, which is arranged on the top seat and is used to blow the inner drum and the outer drum from the top, and the cleaning inlet includes a third inlet, which is connected to the top cleaning channel.

[0030] The beneficial effect of adopting the above further solution is that a top cleaning channel is provided on the top seat, which facilitates cleaning and purging of the tops of the inner and outer drums and the inner wall of the measuring cavity.

[0031] On the basis of the above technical solution, the present invention can also be improved as follows.

[0032] Furthermore, the top cleaning channel has a third purge port, and there are multiple third purge ports.

[0033] The beneficial effect of adopting the above further solution is that: a plurality of third purging ports are provided, and the tops of the inner and outer drums and the inner wall of the measuring chamber can be cleaned and purged in different directions.

[0034] On the basis of the above technical solution, the present invention can also be improved as follows.

[0035] Furthermore, it also includes a top adapter seat, which is located between the top seat and the detection component. There is a gap between the inner cylinder shaft, the top seat and the top adapter seat, and the top adapter seat is provided with a blowing channel for blowing air into the gap.

[0036] The beneficial effect of adopting the above further solution is: by setting up an air blowing channel, the gap between the inner cylinder shaft and the top seat and the top adapter seat is purged with pressurized gas, and the attached crops and residues in the gap are blown away, so that the inner cylinder shaft can rotate normally.

[0037] On the basis of the above technical solution, the present invention can also be improved as follows.

[0038] Furthermore, the cleaning outlet is provided on the base.

[0039] The beneficial effect of adopting the above further solution is that the cleaning outlet is arranged on the base, so as to facilitate the drainage of residual liquid in the measuring cavity, and the cleaning outlet can also be shared with the liquid drainage outlet during measurement.

[0040] On the basis of the above technical solution, the present invention can also be improved as follows.

[0041] Furthermore, the other end of the inner cylinder shaft is connected to the rotation angle recognition component through a magnetic transmission mechanism.

[0042] The beneficial effects of adopting the above further solution are: contactless transmission is achieved through the magnetic transmission mechanism, which not only solves the sealing problem but also improves transmission efficiency, reduces transmission energy consumption, and has a fast response speed.

[0043] On the basis of the above technical solution, the present invention can also be improved as follows.

[0044] Furthermore, the magnetic transmission mechanism includes an inner magnetic ring fixedly connected to the other end of the inner cylindrical shaft and an outer magnetic ring separately sleeved therefrom; the inner magnetic ring is sleeved and fixed on the inner cylindrical shaft and rotates with the inner cylindrical shaft; the outer magnetic ring and the rotating dial are sleeved on the upper rotating shaft to realize synchronous magnetic transmission of the inner and outer magnetic rings to drive the upper rotating shaft and the rotating dial to rotate, thereby realizing synchronous rotation of the rotating dial and the inner rotating cylinder; the angle recognition component includes a rotating dial and an encoder, the rotating dial is rotatably connected to the top mounting plate and fixedly connected to the outer magnetic ring, and the encoder is used to read the rotation angle of the rotating dial.

[0045] The beneficial effect of adopting the above further solution is that, through coaxial magnetic transmission, the entire device is shorter in height and has a more compact structure.

[0046] On the basis of the above technical solution, the present invention can also be improved as follows.

[0047] Furthermore, it also includes a magnetic levitation component, which includes an upper magnetic ring and a lower magnetic ring. The upper magnetic ring is fixedly sleeved on the top of the other end of the inner cylindrical shaft, and the lower magnetic ring passes through the other end of the inner cylindrical shaft and is fixedly set on the encoder protection cover seat. The same poles of the upper magnetic ring and the lower magnetic ring are set facing each other.

[0048] The beneficial effect of adopting the above further solution is: through the repulsive force generated between the upper and lower magnetic rings, the gravity of the inner cylinder shaft, the inner rotating cylinder and the inner magnetic ring is eliminated, the rotation of the inner cylinder shaft is more flexible, and the measurement accuracy of the equipment is improved.

[0049] On the basis of the above technical solution, the present invention can also be improved as follows.

[0050] Furthermore, the cleaning outlet is provided with a multi-way valve for discharging the tested medium or cleaning liquid into different volume tanks respectively.

[0051] The beneficial effect of adopting the above further solution is that by providing a multi-way valve, the tested medium or cleaning liquid can be discharged to different volume tanks respectively.

[0052] An embodiment of the present invention further provides a drilling fluid measurement system, comprising a control module, a pumping module and a measurement module.

[0053] The measuring module is the above-mentioned rotational viscosity measuring instrument, and the control module is electrically connected to the pumping module and the measuring module;

[0054] The pumping module is used to pump the measured medium or cleaning liquid to the rotational viscosity measuring instrument through the cleaning inlet.

[0055] The operating principle and beneficial effects of this measurement system are as follows: By setting up a modular drilling fluid measurement system, a modular pipeline connection is adopted between the pumping module and the measurement module, realizing a modular combination of the drilling fluid measurement system. When drilling fluid viscosity measurement is required, the pumping module pumps the measured medium through the clean inlet to the rotary viscometer for testing, which is very simple and convenient. At the same time, the pumping module also has the function of pumping clean fluid, so that the measurement system has both measurement and cleaning functions.

[0056] On the basis of the above technical solution, the present invention can also be improved as follows.

[0057] Furthermore, the measuring module includes a continuous measuring module and a discontinuous measuring module, and the rotational viscosity measuring instrument is a discontinuous measuring module.

[0058] The beneficial effect of adopting the above further solution is that by setting up multiple different types of measurement modules, the testing of multiple different parameters is achieved.

[0059] On the basis of the above technical solution, the present invention can also be improved as follows.

[0060] Furthermore, the pumping module includes a first pumping module. When the measuring module includes multiple continuous measuring modules and multiple discontinuous measuring modules, the multiple continuous measuring modules are connected in series through pipelines, the first pumping module is connected to the first continuous measuring module, and the last continuous measuring module is connected in parallel with the discontinuous measuring modules through pipelines.

[0061] The beneficial effect of adopting the above further scheme is: for multiple first-type measurement modules and multiple second-type measurement modules, the first-type measurement modules are first connected in series, and then the last first-type measurement module is connected in parallel with the second-type measurement module through a pipeline, thereby achieving simultaneous measurement of multiple continuously measured parameters and multiple non-continuously measured parameters.

[0062] On the basis of the above technical solution, the present invention can also be improved as follows.

[0063] Furthermore, the pumping module includes a second pumping module for pumping the cleaning fluid to the discontinuous measurement module through a pipeline.

[0064] The beneficial effect of adopting the above further solution is that by providing a separate second pumping module for pumping the cleaning liquid to the discontinuous measurement module through the pipeline, the separate cleaning and immediate cleaning of the discontinuous measurement module are facilitated.

[0065] On the basis of the above technical solution, the present invention can also be improved as follows.

[0066] Furthermore, the continuous measurement module includes a density measurement module, a pH value measurement module and a chloride ion measurement module, and the discontinuous measurement module also includes a filtration loss measurement module and a solid content measurement module.

[0067] The beneficial effect of adopting the above further solution is that by setting the above multiple measurement modules, coverage of various main parameters of the drilling fluid is achieved.

[0068] On the basis of the above technical solution, the present invention can also be improved as follows.

[0069] Furthermore, it also includes a clean air source, the pumping module has a pumping outlet, and the clean air source is connected to the pumping outlet through an air pipe.

[0070] The beneficial effects of adopting the above further solution are: the measurement module is cleaned by the clean gas source; at the same time, the residual drilling fluid or cleaning fluid in the pipeline is easily purged by connecting to the pump outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] FIG1 is a schematic cross-sectional view of a first embodiment of a rotational viscosity measuring instrument according to the present invention;

[0072] FIG2 is a schematic diagram of a first working state of the first embodiment;

[0073] FIG3 is a schematic diagram of a second working state of the first embodiment;

[0074] 4 is a schematic cross-sectional view of a second embodiment of a rotational viscosity measuring instrument according to the present invention;

[0075] FIG5 is a schematic diagram of a first working state of the second embodiment;

[0076] FIG6 is a schematic diagram of a second working state of the second embodiment;

[0077] FIG7 is a schematic diagram of the structure of the third embodiment

[0078] FIG8 is a structural diagram of a drilling fluid measurement system according to a first embodiment;

[0079] FIG9 is a schematic structural diagram of a drilling fluid measurement system according to a second embodiment;

[0080] FIG10 is a schematic structural diagram of a third embodiment of a drilling fluid measurement system.

[0081] In the accompanying drawings, the list of parts represented by each reference number is as follows: 11. Torque regulating valve protection cover, 12. Torque regulating valve, 13. Top mounting plate, 14. Rotating dial, 15. Encoder, 16. Magnetic transmission mechanism, 17. Encoder protection cover, 18. Upper magnetic ring, 19. Lower magnetic ring, 2. Top adapter, 21. Blowing channel, 22. Gap, 3. Top seat, 31. Third inlet, 32. Third purge port, 4. Inner drum, 41. Inner drum shaft, 5. Measuring cup body, 51. First inlet, 52. First purge port, 53. Overflow port, 54. Pulp inlet, 6. Outer drum, 61. Drive shaft, 62. Second inlet, 63. Second purge port, 7. Base, 71. Cleaning outlet, 8. Motor mounting plate, 9. Motor, 101. First pumping module, 1011. First Pumping outlet, 102, second pumping module, 1021, second pumping outlet, 201, density measurement module, 202, pH value measurement module, 203, chloride ion measurement module, 301, rotational viscosity meter, 302, filtration loss measurement module, 303, solid content measurement module, 401, drilling fluid pool, 402, cleaning fluid pool, 403, clean gas source, 404, cleaning fluid recovery pool, 501, three-in-one pipeline, 502, clean liquid and gas pipeline, 503, drilling fluid pipeline, 504, clean liquid pipeline, 505, clean gas pipeline, 506, waste liquid pipeline, 60, control device. DETAILED DESCRIPTION

[0082] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0083] 1 to 3 are schematic structural diagrams of a first embodiment of the rotational viscosity measuring instrument of the present invention.

[0084] As shown in Figures 1 to 3, the rotational viscosity meter includes a cup body assembly and a measuring assembly, wherein the cup body assembly comprises a measuring cup body 5, a base 7 and a top seat 3, and a measuring cavity enclosed therein. The cup body assembly is provided with a cleaning inlet and a cleaning outlet that pass through the measuring cavity. The cup body assembly is also provided with a cleaning channel for cleaning the measuring assembly, and the cleaning channel is connected to the cleaning inlet.

[0085] The measuring chamber is provided with an inner rotating cylinder 4 and an outer rotating cylinder 6. The inner rotating cylinder 4 is sleeved in the outer rotating cylinder 6, and a gap is provided between the inner rotating cylinder 4 and the outer rotating cylinder 6.

[0086] One end of the inner drum 4 is connected to one end of the inner drum shaft 41 , and the other end of the inner drum shaft 41 passes through the top seat 3 and is connected to the detection assembly. Specifically, the inner drum shaft 41 is rotatably connected to the top seat 3 through a bearing.

[0087] One end of the outer drum 6 is connected to one end of the transmission shaft 61 , and the other end of the transmission shaft 61 passes through the base 7 and is connected to the driving structure.

[0088] Specifically, the cleaning channel includes a side cleaning channel, which is provided on the side wall of the measuring cup body 5 for purging the inner drum 4 and the outer drum 6; the cleaning inlet includes a first inlet 51, which is connected to the side cleaning channel. The side purging channel has a first purging port 52, which is used to connect to an external purging pipeline. The first purging port 52 is a narrow slit purging port provided in the axial direction of the measuring cup body 5. The narrow slit purging port means that when cleaning liquid is input into the first inlet 51, the cleaning liquid forms a water knife effect at the narrow slit purging port, further improving the cleaning effect on the inner drum 4 and the outer drum 6; at the same time, when cleaning gas is input into the first inlet 51, the cleaning gas forms an air knife effect at the narrow slit purging port, further improving the purging effect on the inner drum 4 and the outer drum 6. At the same time, a slurry inlet 54 and a slurry overflow port 53 are provided on one side of the measuring cup body 5, wherein the slurry inlet 54 is provided on the side of the measuring cup body 5 near the bottom, and the slurry overflow port 53 is provided on the side of the measuring cup body 5 slightly higher than the corresponding position of the outer drum 6.

[0089] The purging range of the first purging port 52 exceeds the axial range of the inner drum 4 and the outer drum 6 in the measuring cup body 5, that is, the length of the first purging port 52 in the vertical direction in the figure as shown in the figure is greater than the length of the inner drum 4 and the outer drum 6 combined together, that is, the cleaning liquid sprayed from the first purging port 52 can completely cover the inner drum 4 and the outer drum 6 in the upper and lower directions as shown in the figure; at the same time, the cleaning gas sprayed from the first purging port 52 can completely cover the inner drum 4 and the outer drum 6 in the upper and lower directions as shown in the figure.

[0090] In this embodiment, the detection assembly includes a magnetic transmission mechanism 16 connected to the other end of the inner cylindrical shaft 41 and a rotation angle recognition assembly connected thereto. The magnetic transmission mechanism 16 includes an inner magnetic ring fixedly connected to the other end of the inner cylindrical shaft 41 and an outer magnetic ring separately sleeved therefrom. The inner magnetic ring is sleeved and fixed to the inner cylindrical shaft 41 and rotates with the inner cylindrical shaft 41. The outer magnetic ring and the rotating dial 14 are sleeved on the upper rotating shaft. Specifically, the lower end of the upper rotating shaft is connected to the rotating dial 14 in the figure. The upper rotating shaft is connected to the torque regulating valve 12. The synchronous magnetic transmission of the inner and outer magnetic rings drives the upper rotating shaft and the rotating dial 14 to rotate, thereby achieving synchronous rotation of the rotating dial 14 and the inner rotating drum 4. The rotation angle recognition assembly includes the rotating dial 14 and an encoder 15 for reading the rotation angle of the rotating dial 14. The encoder 15 is disposed in an encoder protective cover, which is connected to the top base 3. A torque control valve protective cover 11 is also mounted on the encoder 15 protective cover. A top mounting plate 13 is located between the encoder 15 protective cover and the torque control valve protective cover 11. A torque control valve 12 is mounted on the top mounting plate 13 and connected to the rotary dial 14. In this embodiment, one end of the inner cylindrical shaft 41 is first connected to the encoder protective cover 17 via a bearing and then to the inner magnetic ring.

[0091] The other end of the transmission shaft 61 is connected to the motor 9, one end of the motor mounting plate 8 is used to install the motor 9, and the other end of the motor mounting plate 8 is connected to the base 7. A cleaning outlet 71 is provided on the base 7. The cleaning outlet 71 runs through the bottom of the measuring cavity to the side of the base 7 to facilitate the complete drainage of the liquid in the measuring cavity. Specifically, a three-way valve is provided at the clean outlet for discharging the tested medium or cleaning liquid into different volume tanks respectively. When used to discharge the measured medium, it is discharged into the medium volume tank by controlling the three-way valve. When used to discharge the cleaning liquid, it is discharged into the cleaning liquid volume tank by controlling the three-way valve.

[0092] When the test is complete and the measuring instrument needs to be cleaned, the external control device, as shown in Figure 2 (the arrow in the figure indicates the flow direction of the cleaning liquid), inputs the cleaning liquid through the first inlet 51. The cleaning liquid is then sprayed from the first purge port 52 onto the inner and outer drums 4 and 6. Simultaneously, the motor 9 is activated, driving the outer drum 6 to rotate, thus cleaning the inner and outer drums 4 and 6. The cleaning liquid then fills the measuring chamber, and the spray from the first purge port 52 also cleans the inner wall of the measuring cup. The cleaning liquid is then discharged from the measuring chamber through the cleaning outlet 71. Continuous cleaning and drainage can also be performed during the cleaning process.

[0093] After liquid cleaning is complete, the measuring instrument needs to be purged with gas. As shown in Figure 3, the direction of the dotted arrow indicates the flow direction of the cleaning gas. Cleaning gas is introduced through first inlet 51 and then sprayed from first purge port 52 onto inner drum 4 and outer drum 6. Simultaneously, motor 9 is activated, driving outer drum 6 to rotate, purging the inner and outer drums 4 and 6. At the same time, the cleaning gas fills the measuring chamber, and the spray from first purge port 52 also purges the inner wall of the measuring cup. Continuous purging and exhaust are performed during the cleaning gas purging process.

[0094] In this embodiment, the viscosity measurement process of the rotary viscometer is as follows: the cleaning outlet 71 is closed, and the medium to be measured is input into the measuring cup 5 through the slurry inlet 54. The medium to be measured submerges the top of the outer drum 6, and the excess medium to be measured overflows from the slurry overflow outlet 53. Before the motor 9 is started, the slurry inlet 54 and the slurry overflow outlet 53 are closed in sequence; then the motor 9 is started to drive the outer drum 6 to rotate. The medium in the outer drum 6 has a certain viscosity, that is, the outer drum 6 drives the medium to be measured to rotate, and the medium to be measured drives the inner drum 4 to rotate a certain angle. The inner drum 4 drives the inner magnetic ring to rotate through the inner drum shaft 41. Due to the effect of magnetic force, the outer magnetic ring sleeved with the inner magnetic ring will also deflect, and the rotary dial 14 will also rotate synchronously. The encoder 15 identifies the rotation angle of the rotary dial 14, thereby obtaining the rotation angle of the inner drum shaft 41, and thus calculating the viscosity value of the medium to be measured. Following the viscosity meter's measurement steps, motor 9 rotates sequentially from fast to slow for the required time at each speed. At each speed, encoder 15 reads the swing scale value of the rotary dial, and an algorithm is used to determine the rotational viscosity of the measured medium at each speed. Upon completion of the measurement, clean outlet 71 is opened to discharge the measured medium, while overflow outlet 53 is also opened to facilitate rapid discharge of the measured medium.

[0095] A torque regulating valve 12 is installed on the top mounting plate 13 to adjust the damping value of the upper rotating shaft and facilitate regular calibration of the equipment. Specifically, the torque regulating valve 12 is fixed to the top mounting plate 13 via a support. The torque regulating valve 12 is connected to the rotating dial 14 and the magnetic ring mounting. The torque regulating valve 12 presets a torque opposite to the direction of rotation of the inner drum during measurement, causing the inner drum shaft 41 and the inner drum 4 to rotate in the opposite direction when not measuring, allowing the limit stop to contact the gear lever, achieving "zeroing".

[0096] See Figures 4 to 6 for a schematic structural diagram of a second embodiment of the rotational viscosity measuring instrument of the present invention. Based on the first embodiment, the cleaning channel includes a bottom cleaning channel, which is provided on the drive shaft and is used to purge the inner drum 4 and the outer drum 6 from the bottom. The cleaning inlet includes a second inlet 62, which is connected to the bottom cleaning channel. The bottom cleaning channel passes through the base 7 and is connected to the outside. The bottom cleaning channel has a second purge port 63. The second inlet 62 is provided on the base 7, and the drive shaft 61 is sealed with the motor mounting plate 8 and the base 7, so that a sealed cavity is formed between the drive shaft 61 and the base 7, and the second inlet 62 is connected to this sealed cavity. At the same time, the drive shaft 61 is provided with a channel that passes through the sealed cavity and is connected to the second purge port 63. The second purge port 63 is provided at the top end of the drive shaft 61 shown in the figure, wherein the second purge port 63 is provided as a nozzle structure.

[0097] Specifically, the second purge port 63 is positioned at the axial center of the drive shaft 61, ensuring that the bottom cleaning channel can clean the bottom of the inner drum 4 and the interior of the outer drum 6. The nozzle structure at the second purge port 63 produces a spray effect for the cleaning liquid and cleaning gas. Specific implementation methods include designing the second purge port 63 as a structure with a spray effect or installing a nozzle on the second purge port.

[0098] In this embodiment, the cleaning channel includes a top cleaning channel, which is provided on the top seat and is used to purge the inner drum 4 and the outer drum 6 from the top. The cleaning inlet includes a third inlet 31, which communicates with the top cleaning channel. The top cleaning channel has a third purge port 32, which is provided on the top seat 3 and is open to the outside world. There are multiple third purge ports 32.

[0099] Specifically, an annular channel is provided at the top of the top seat 3, communicating with the third inlet 31 and multiple third purge ports 32. The nozzle structure is configured to spray the cleaning liquid and clean gas at the third purge ports 32. This can be achieved by designing the third purge ports 32 as a spraying structure or by installing a nozzle thereon.

[0100] It also includes a top adapter seat 2, which is located between the top seat 3 and the detection component. There is a gap 22 between the inner cylinder shaft 41 and the top seat 3 and the top adapter seat 2. The top adapter seat 2 is provided with a blowing channel 21 for blowing air into the gap 22.

[0101] Specifically, an air blowing channel 21 is provided on the top adapter seat 2 and communicates with the gap 22 , and an air blowing inlet is provided on the side of the top adapter seat 2 .

[0102] The viscosity measurement process of the rotary viscometer of this embodiment is as follows: Compared with the first embodiment, the difference is that, due to the addition of a bottom cleaning channel in this embodiment, the second inlet 62 and the cleaning outlet 71 must be closed simultaneously. At the same time, when the measurement is completed, the second inlet 62 and the cleaning outlet 71 are opened simultaneously to discharge the measured medium, and the overflow port 53 is also opened to facilitate the rapid discharge of the measured medium.

[0103] The operating process of this embodiment is as follows: Liquid and gas purging through first inlet 51 proceed in the same manner as in Example 1. When the test is complete and the measuring instrument needs to be cleaned, cleaning liquid is introduced through first inlet 51 via an external control device, as shown in Figure 5 (the arrow in the figure indicates the flow direction of the cleaning liquid). The cleaning liquid is then sprayed from first purge port 52 onto inner and outer drums 4 and 6. Simultaneously, motor 9 is activated, driving outer drum 6 to rotate, thereby cleaning both drums. Simultaneously, the spray from first purge port 52 cleans the inner wall of the measuring cup, and the cleaning liquid is discharged from the measuring chamber through cleaning port 71. Continuous cleaning and drainage can also be performed during the cleaning process.

[0104] While the aforementioned side cleaning is being performed, bottom cleaning can also be performed. Specifically, the arrow in the figure indicates the flow direction of the cleaning liquid. Cleaning liquid is introduced through the second inlet 62 and then sprayed from the second purge port 63 onto the bottom of the inner drum 4 and the interior of the outer drum 6. Simultaneously, the motor 9 is activated, driving the outer drum 6 to rotate, thereby cleaning the lower portion of the inner drum 4 and the interior of the outer drum 6. Simultaneously, the spraying action of the second purge port 63 also cleans the adhesive material on the exterior of the inner drum 4 and the interior of the outer drum 6. The cleaning liquid is then discharged from the measurement chamber through the three-way valve of the cleaning outlet 71 into the cleaning liquid reservoir. Continuous cleaning and drainage can also be performed during the cleaning process.

[0105] At the same time, top cleaning can be performed. Specifically, the arrow in the figure indicates the flow direction of the cleaning liquid. Cleaning liquid is introduced through the third inlet 31 and then sprayed from the third purge port 32 onto the top of the inner drum 4 and the top of the outer drum 6. Simultaneously, the motor 9 is activated, driving the outer drum 6 to rotate, thus cleaning the tops of the inner drum 4 and the outer drum 6. Simultaneously, the cleaning liquid fills the measuring chamber, and the spray from the third purge port 32 also cleans any adhesive material from the tops of the inner drum 4 and the outer drum 6. The cleaning liquid is then discharged from the measuring chamber through the cleaning outlet 71. Continuous cleaning and drainage can also be performed during the cleaning process.

[0106] During liquid cleaning, pressurized gas is continuously injected into the air blowing channel 21 to form a positive pressure in the gap 22 around the inner cylinder shaft 41 , thereby preventing the cleaning liquid from entering the gap 22 and affecting the normal rotation of the inner cylinder shaft 41 .

[0107] After liquid cleaning is complete, the measuring instrument needs to be purged with gas. As shown in Figure 6, the direction of the dotted arrow in the figure represents the flow direction of the cleaning gas. Cleaning gas is introduced through the first inlet 51 and then sprayed from the first purge port 52 onto the inner drum 4 and outer drum 6. Simultaneously, the motor 9 is activated, driving the outer drum 6 to rotate, purging the inner drum 4 and outer drum 6. Simultaneously, the spray from the first purge port 52 also purges the inner wall of the measuring cup. Continuous purging and exhaust are performed during the purge process.

[0108] While the above-mentioned side gas purge is being performed, bottom gas purge can be performed. The specific operation is as follows: the direction of the dotted arrow in the figure represents the flow direction of the clean gas. The clean gas is input through the second inlet 62 and then sprayed from the second purge port 63 to the lower portion of the inner drum 4 and the interior of the outer drum 6. At the same time, the motor 9 is also started to drive the outer drum 6 to rotate, completing the purge of the lower portion of the inner drum 4 and the interior of the outer drum 6. Continuous purge and exhaust can also be performed during the purge process.

[0109] At the same time, top gas purging can be performed. Specifically, the arrow in the figure indicates the direction of clean gas flow. Clean gas is introduced through the third inlet 31 and then sprayed from the third purge port 32 onto the tops of the inner drum 4 and outer drum 6. Simultaneously, the motor 9 is activated, driving the outer drum 6 to rotate, purging the tops of the inner drum 4 and outer drum 6. The clean gas is then discharged from the measurement chamber through the clean outlet 71. Continuous purging and exhaust can also be performed during the gas purging process.

[0110] Similarly, during gas purging, pressurized gas is continuously injected into the air blowing channel 21 to form a positive pressure in the gap 22 around the inner cylinder shaft 41 , thereby preventing liquid or particles from entering the gap 22 and affecting the normal rotation of the inner cylinder shaft 41 .

[0111] See Figure 7 for a schematic diagram of the structure of the third embodiment of the rotational viscosity measuring instrument of the present invention. Based on the second embodiment, a magnetic levitation structure and a position limiting structure are added. While maintaining the structure of the measuring chamber, the magnetic levitation assembly includes an upper magnetic ring 18 and a lower magnetic ring 19. The upper magnetic ring 18 is fixedly mounted on the top of the other end of the inner cylindrical shaft 41, while the lower magnetic ring 19 passes through the other end of the inner cylindrical shaft 41 and is fixedly mounted on the encoder protective cover. The same poles of the upper and lower magnetic rings 18 and 19 are arranged facing each other. This structure forms an axial magnetic levitation structure. The repulsive force of the upper and lower magnetic rings eliminates the gravity of the inner rotating drum 4 and the rotating shaft, that is, eliminates the additional vertical force, allowing the rotational torque value of the inner rotating drum 4 to be flexibly detected at different rotational speeds. Among them, a limiting mechanism is arranged on the side of the outer magnetic ring mounting part, and the outer magnetic ring mounting part is a component connected to the upper rotating shaft for mounting the outer magnetic ring. As shown in Figure 7, a gear lever is provided on the outer magnetic ring mounting part, and a block is provided on the encoder protective cover 17 to prevent the inner cylinder shaft 41 from rotating too much or even continuously rotating more than 360° when measuring a medium with a large viscosity, thereby ensuring the reliability of the measuring instrument.

[0112] An embodiment of the present invention also provides a drilling fluid measurement system, including a control module, a pumping module and a measuring module. The measuring module is the above-mentioned rotational viscosity measuring instrument, and the control module is electrically connected to the pumping module and the measuring module; the pumping module is used to pump the measured medium or cleaning fluid to the rotational viscosity measuring instrument through the clean inlet.

[0113] FIG8 is a schematic diagram of the structure of a drilling fluid measurement system according to an embodiment of the present invention. The system includes a control module 60, a pumping module, and a measuring module. The measuring module is the aforementioned rotational viscosity meter 301, which performs a six-speed test on the drilling fluid. Specifically, the pumping module includes a first pumping module 101 and a first pumping outlet 1011 provided on the first pumping module 101. The rotational viscosity meter 301 is provided with an input interface and an output interface. In this embodiment, the input interface is the first inlet 51, and the output interface is the cleaning outlet 71. Valves (not shown) are provided at the input and output interfaces of the measuring module. The first pumping module 101 is connected to the rotational viscosity meter 301 via a three-in-one pipeline 501. A control device 60 is also included, which is electrically connected to the rotational viscosity meter 301 and the first pumping module 101 via a control line. Specifically, the control includes controlling the functions of each measuring module, the pumping function of the pumping module, and controlling the valves of the input and output interfaces of each measuring module to switch the pipelines.

[0114] The system further includes a drilling fluid pool 401, a cleaning fluid pool 402, a clean gas source 403, and a clean fluid recovery pool 404. The drilling fluid pool 401 is connected to the first pumping module 101 via a drilling fluid pipeline 503, the cleaning fluid pool 402 is connected to the first pumping module 101 via a clean fluid pipeline 504, and the clean gas source 403 is connected to the first pumping outlet 1011 of the first pumping module 101 via a clean gas pipeline 505. The first pumping outlet 1011 of the first pumping module 101 is then connected to the first inlet 51 of the rotational viscometer 301 via a three-in-one pipeline 501. The clean outlet 71 of the rotational viscometer 301 discharges the measured drilling fluid into the drilling fluid pool 401 via the drilling fluid pipeline 503. Simultaneously, the clean outlet 71 of the rotational viscometer 301 discharges the clean fluid into the clean fluid recovery pool 404 via a waste fluid pipeline 506.

[0115] The measurement process is as follows: the drilling fluid to be tested in the drilling fluid pool 401 is pumped to the rotational viscosity meter 301 through the first pumping module 101 for six-speed testing. After the test is completed, the drilling fluid to be tested is finally output to the drilling fluid pool 401 through the clean outlet 71 of the rotational viscosity meter 301.

[0116] The working process of liquid cleaning of the measuring system is: the cleaning liquid in the cleaning liquid pool 402 is pumped to the rotational viscosity measuring instrument 301 through the first pumping module 101, that is, the cleaning liquid performs liquid cleaning on the rotational viscosity measuring instrument 301, and the cleaning liquid is finally output to the cleaning liquid recovery pool 404 through the cleaning outlet 71 of the rotational viscosity measuring instrument 301.

[0117] The working process of gas cleaning of the measurement system is as follows: by controlling the valve, the clean gas in the clean gas source 403 enters the density measurement module 201 through the pipeline, that is, the clean gas purges the rotational viscosity meter 301, and the cleaning liquid remaining in the measurement module and the pipeline is finally output to the cleaning liquid recovery tank 404 through the cleaning outlet 71 of the rotational viscosity meter 301.

[0118] FIG9 is a schematic structural diagram of a second embodiment of a drilling fluid measurement system according to the present invention.

[0119] In this embodiment, compared with the first embodiment, one more first-type measurement module is selected, and the first-type measurement module is a density measurement module 201. In this embodiment, the rotational viscosity measuring instrument 301 is simplified in illustration.

[0120] The pumping module includes a first pumping module 101 and a first pumping outlet 1011 disposed on the first pumping module 101. The first pumping module 101 is fluidly connected to the density measurement module 201 via a three-in-one pipeline 501. The density measurement module 201 is connected to the rotational viscometer 301 via a drilling fluid pipeline 503. A control device 60 is disposed above the density measurement module 201 and is electrically connected to the density measurement module 201 and the rotational viscometer 301 via control lines.

[0121] The drilling fluid pool 401 is connected to the first pumping module 101 through the drilling fluid pipeline 503, the cleaning fluid pool 402 is connected to the first pumping module 101 through the cleaning fluid pipeline 504, the clean gas source 403 is connected to the first pumping outlet 1011 of the first pumping module 101 through the clean gas pipeline 505, and then the first pumping outlet 1011 of the first pumping module 101 is connected to the density measurement module 201 through the three-in-one pipeline 501.

[0122] It also includes a second pumping module 102, and a second pumping outlet 1021 arranged on the second pumping module 102. The cleaning liquid pool 402 is connected to the second pumping module 102 through a cleaning liquid pipeline 504, and the cleaning gas source 403 is connected to the second pumping outlet 1021 of the second pumping module 102 through a cleaning gas pipeline 505. Then, the second pumping outlet 1021 of the second pumping module 102 is connected to the rotational viscosity meter 301 through the clean liquid and gas pipeline 502.

[0123] The output of density measurement module 201 discharges the measured drilling fluid into drilling fluid pool 401 via drilling fluid pipeline 503. Simultaneously, the output of density measurement module 201 also discharges the clean fluid into clean fluid recovery pool 404 via waste fluid pipeline 506. The clean outlet 71 of rotational viscometer 301 discharges the measured drilling fluid into drilling fluid pool 401 via drilling fluid pipeline 503. Simultaneously, the output of rotational viscometer 301 also discharges the clean fluid into clean fluid recovery pool 404 via waste fluid pipeline 506.

[0124] In this embodiment, the density measurement module 201 continuously measures the density of the drilling fluid, and the rotational viscosity meter 301 performs a six-speed discontinuous test on the drilling fluid.

[0125] The measurement process is as follows: the first pumping module 101 pumps the drilling fluid under test from the drilling fluid pool 401 to the density measurement module 201 for continuous density measurement. The tested drilling fluid is then output to the drilling fluid pool 401 through the output interface of the density measurement module 201. To perform a six-speed test on the drilling fluid, the control valve between the density measurement module 201 and the rotational viscometer 301 is opened, allowing the drilling fluid to flow into the rotational viscometer 301. The six-speed test is then performed, and the tested drilling fluid is finally output to the drilling fluid pool 401 through the output interface of the rotational viscometer 301.

[0126] The working process of liquid cleaning of the density measurement module 201 is as follows: the cleaning liquid in the cleaning liquid pool 402 is pumped to the density measurement module 201 through the first pumping module 101, and the density measurement module 201 is liquid cleaned. The cleaning liquid is finally output to the cleaning liquid recovery pool 404 through the output interface of the density measurement module 201.

[0127] The working process of liquid cleaning of the rotational viscosity measuring instrument 301 is as follows: the cleaning liquid in the cleaning liquid pool 402 is pumped to the rotational viscosity measuring instrument 301 through the second pumping module 102, and the rotational viscosity measuring instrument 301 is liquid cleaned. The cleaning liquid is finally output to the cleaning liquid recovery pool 404 through the output interface of the rotational viscosity measuring instrument 301.

[0128] The working process of gas cleaning of the density measurement module 201 is as follows: by controlling the valve, the clean gas in the clean gas source 403 enters the density measurement module 201 through the pipeline, the density measurement module 201 is purged with gas, and the cleaning liquid remaining in the measurement module and the pipeline is finally output to the cleaning liquid recovery tank 404 through the output interface of the density measurement module 201.

[0129] The working process of gas cleaning of the rotational viscosity meter 301 is as follows: by controlling the valve, the clean gas in the clean gas source 403 is allowed to enter the rotational viscosity meter 301, the rotational viscosity meter 301 is purged with gas, and the cleaning liquid remaining in the measurement module and the pipeline is finally output to the cleaning liquid recovery tank 404 through the output interface of the rotational viscosity meter 301.

[0130] FIG10 is a schematic diagram of the structure of the third embodiment of the drilling fluid measurement system of the present invention.

[0131] In this embodiment, three first-category measurement modules and three second-category measurement modules are selected. The first-category measurement modules include density measurement module 201, pH measurement module 202, and chloride ion measurement module 203, while the second-category measurement modules include rotational viscometer 301, fluid loss measurement module 302, and solid content measurement module 303.

[0132] The pumping module includes a first pumping module 101 and a first pumping outlet 1011 provided on the first pumping module 101. The measurement module includes three first-class measurement modules: a density measurement module 201, a pH measurement module 202, and a chloride ion measurement module 203. Each first-class measurement module is provided with an input interface and an output interface (not shown in the figure), and each measurement module is provided with a valve at the input interface and the output interface. The density measurement module 201, the pH measurement module 202, and the chloride ion measurement module 203 are connected in series via a three-in-one pipeline 501, and the first pumping module 101 and the density measurement module 201 are fluidically connected via the three-in-one pipeline 501. The rotational viscosity meter 301 and the fluid loss measurement module 302 are respectively connected to the density measurement module 201 via a drilling fluid pipeline 503, forming a structure in which the rotational viscosity meter 301 and the fluid loss measurement module 302 are connected in parallel. The control device 600 is disposed above the density measurement module 201 and is electrically connected to the aforementioned six measurement modules through control lines.

[0133] The drilling fluid pool 401 is connected to the first pumping module 101 via a drilling fluid pipeline 503, the cleaning fluid pool 402 is connected to the first pumping module 101 via a cleaning fluid pipeline 504, and the clean gas source 403 is connected to the first pumping outlet 1011 of the first pumping module 101 via a clean gas pipeline 505. The first pumping outlet 1011 of the first pumping module 101 is then connected to the density measurement module 201 via a three-in-one pipeline 501. The output of the chloride ion measurement module 203 discharges the measured drilling fluid into the drilling fluid pool 401 via the drilling fluid pipeline 503. The output of the chloride ion measurement module 203 discharges the cleaning fluid into the cleaning fluid recovery pool 404 via a waste liquid pipeline 506.

[0134] The cleaning liquid pool 402 is connected to the second pumping module 102 through the cleaning liquid pipeline 504, and the cleaning gas source 403 is connected to the second pumping outlet 1021 of the second pumping module 102 through the cleaning gas pipeline 505. Then the second pumping outlet 1021 of the second pumping module 102 is respectively connected to the rotational viscosity meter 301 and the filtration loss measurement module 302 through the cleaning liquid and gas pipeline 502.

[0135] The output of density measurement module 201 discharges the measured drilling fluid into drilling fluid pool 401 via drilling fluid pipeline 503. The output of density measurement module 201 discharges the clean fluid into clean fluid recovery pool 404 via waste fluid pipeline 506. Simultaneously, the outputs of rotational viscosity meter 301 and fluid loss measurement module 302 discharge the measured drilling fluid into drilling fluid pool 401 via drilling fluid pipeline 503. The outputs of rotational viscosity meter 301 and fluid loss measurement module 302 discharge the clean fluid into clean fluid recovery pool 404 via waste fluid pipeline 506.

[0136] In this embodiment, the density measurement module 201, pH value measurement module 202, and chloride ion measurement module 203 continuously measure the density, pH value, and chloride ion content of the drilling fluid, respectively. The rotational viscosity meter 301, fluid loss measurement module 302, and solid content measurement module 303 perform discontinuous tests on the drilling fluid for six speed, fluid loss, and solid content, respectively.

[0137] The measurement process is as follows: the drilling fluid to be tested in the drilling fluid pool 401 is pumped to the density measurement module 201 via the first pumping module 101. Specifically, the drilling fluid undergoes continuous density, pH, and chloride ion measurements via the density measurement module 201, pH measurement module 202, and chloride ion measurement module 203. The tested drilling fluid is then output to the drilling fluid pool 401 via the output interface of the chloride ion measurement module 203. To perform a six-speed test on the drilling fluid, the control valve between the density measurement module 201 and the rotational viscometer 301 is opened, allowing the drilling fluid to flow into the rotational viscometer 301. The six-speed test is then performed, and the tested drilling fluid is finally output to the drilling fluid pool 401 via the output interface of the rotational viscometer 301. When a filtration loss test is required for the drilling fluid, the control valve between the density measurement module 201 and the filtration loss measurement module 302 is opened to allow the drilling fluid to flow into the filtration loss measurement module 302 for a filtration loss test. The tested drilling fluid is then output to the drilling fluid pool 401 through the output interface of the filtration loss measurement module 302. When a solids content test is required for the drilling fluid, the control valve between the density measurement module 201 and the solids content measurement module 303 is opened to allow the drilling fluid to flow into the solids content measurement module 303 for a solids content test. The tested drilling fluid is then output to the drilling fluid pool 401 through the output interface of the solids content measurement module 303.

[0138] The working process of liquid cleaning for the first type of measurement module is as follows: the cleaning liquid in the cleaning liquid pool 402 is pumped to the density measurement module 201 through the first pumping module 101, that is, the cleaning liquid respectively performs liquid cleaning on the density measurement module 201, the pH value measurement module 202 and the chloride ion measurement module 203, and the cleaning liquid is finally output to the cleaning liquid recovery pool 404 through the output interface of the chloride ion measurement module 203.

[0139] The working process of liquid cleaning of the rotational viscosity measuring instrument 301 is as follows: the cleaning liquid in the cleaning liquid pool 402 is pumped to the rotational viscosity measuring instrument 301 through the second pumping module 102, and the rotational viscosity measuring instrument 301 is liquid cleaned. The cleaning liquid is finally output to the cleaning liquid recovery pool 404 through the output interface of the rotational viscosity measuring instrument 301.

[0140] The working process of liquid cleaning of the filtration loss measurement module 302 is as follows: the cleaning liquid in the cleaning liquid pool 402 is pumped to the filtration loss measurement module 302 through the second pumping module 102, and the filtration loss measurement module 302 is liquid cleaned. The cleaning liquid is finally output to the cleaning liquid recovery pool 404 through the output interface of the filtration loss measurement module 302.

[0141] The working process of liquid cleaning of the solid content measurement module 303 is as follows: the cleaning liquid in the cleaning liquid pool 402 is pumped to the solid content measurement module 303 through the second pumping module 102, and the solid content measurement module 303 is liquid cleaned. The cleaning liquid is finally output to the cleaning liquid recovery pool 404 through the output interface of the solid content measurement module 303.

[0142] The working process of gas cleaning for the first type of measurement module is as follows: by controlling the valve, the clean gas in the clean gas source 403 is allowed to enter the density measurement module 201 through the pipeline, that is, the clean gas is used to purge the density measurement module 201, the pH value measurement module 202 and the chloride ion measurement module 203 respectively, and the cleaning liquid remaining in the measurement module and the pipeline is finally output to the cleaning liquid recovery tank 404 through the output interface of the chloride ion measurement module 203.

[0143] The working process of gas cleaning of the rotational viscosity meter 301 is as follows: by controlling the valve, the clean gas in the clean gas source 403 is allowed to enter the rotational viscosity meter 301, the rotational viscosity meter 301 is purged with gas, and the cleaning liquid remaining in the measurement module and the pipeline is finally output to the cleaning liquid recovery tank 404 through the output interface of the rotational viscosity meter 301.

[0144] The working process of gas cleaning of the filtration loss measurement module 302 is as follows: the clean gas in the clean gas source 403 is allowed to enter the filtration loss measurement module 302 by controlling the valve, the filtration loss measurement module 302 is gas purged, and the cleaning liquid remaining in the measurement module and the pipeline is finally output to the cleaning liquid recovery tank 404 through the output interface of the filtration loss measurement module 302.

[0145] The working process of gas cleaning of the solid content measurement module 303 is as follows: the clean gas in the clean gas source 403 is allowed to enter the solid content measurement module 303 by controlling the valve, the solid content measurement module 303 is gas purged, and the cleaning liquid remaining in the measurement module and the pipeline is finally output to the cleaning liquid recovery tank 404 through the output interface of the solid content measurement module 303.

[0146] In an embodiment of the present invention, the first pumping module 101 adopts an electric screw pump, and the second pumping module 102 adopts a pneumatic diaphragm pump, wherein the pneumatic diaphragm pump requires a power air source, and the working air source in the embodiment, i.e., the clean air source 403, can be used as the power air source.

[0147] The present invention also provides a drilling fluid measurement system, which differs from the first embodiment mainly in that the rotational viscosity measuring instrument also has a top cleaning channel and a bottom cleaning channel, wherein the first pumping outlet 1011 is also connected to the second inlet 62 and the third inlet 31 of the rotational viscosity measuring instrument 301 through a three-in-one pipeline 501. That is, the rotational viscosity measuring instrument 301 is also cleaned and purged multiple times through the top cleaning channel and the bottom cleaning channel, thereby achieving comprehensive cleaning of the measurement system.

[0148] In a specific embodiment, the first pumping module 101 can utilize other types of electric pumps. Similarly, the second pumping module 102 can also utilize an electric pump. The clean air source in this embodiment is pressurized gas, which does not require pressurization and is directly controlled by valves to purge the measurement module. The clean air source is connected to the pump outlet via an air pipe, facilitating the removal of residual drilling fluid or cleaning fluid from the pipelines throughout the measurement system.

[0149] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A rotational viscosity measuring instrument, characterized in that, It includes a cup body assembly and a measurement assembly; The cup body assembly has a measurement cavity, and a cleaning inlet and a cleaning outlet that communicate with the measurement cavity are provided on the cup body assembly. The cup body assembly also has a cleaning channel for cleaning the measurement assembly, and the cleaning channel communicates with the cleaning inlet; The measurement assembly includes an inner rotating cylinder and an outer rotating cylinder, which are arranged in the measurement cavity.

2. The rotational viscometer according to claim 1, characterized in that, The cup body assembly includes a measurement cup body, a base, and a top seat, and they enclose to form the measurement cavity; One end of the inner rotating cylinder is connected to one end of the inner cylinder shaft, and the other end of the inner cylinder shaft passes through the top seat and is connected to the detection assembly; one end of the outer rotating cylinder is connected to one end of the transmission shaft, and the other end of the transmission shaft passes through the base and is connected to the driving structure; The cleaning channel includes a side cleaning channel, which is arranged on the side wall of the measurement cup body for flushing the inner rotating cylinder and the outer rotating cylinder. The cleaning inlet includes a first inlet, and the first inlet communicates with the side cleaning channel.

3. A rotational viscometer according to claim 2, characterized in that, The side cleaning channel has a first flushing port, and the first flushing port is a narrow slit flushing port arranged in the axial direction of the measurement cup body.

4. A rotational viscometer according to claim 3, characterized in that, The flushing range of the first flushing port exceeds the range of the inner rotating cylinder and the outer rotating cylinder in the axial direction of the measurement cup body.

5. A rotational viscometer according to claim 2, characterized in that, The cleaning channel includes a bottom cleaning channel, which is arranged on the transmission shaft and is used for flushing the inner rotating cylinder and the outer rotating cylinder from the bottom. The cleaning inlet includes a second inlet, and the second inlet communicates with the bottom cleaning channel.

6. A rotational viscometer according to claim 5, characterized in that, The bottom cleaning channel has a second flushing port, and the second flushing port is arranged on the transmission shaft and is a nozzle structure.

7. A rotational viscometer according to claim 2, characterized in that, The cleaning channel includes a top cleaning channel, which is arranged on the top seat and is used for flushing the inner rotating cylinder and the outer rotating cylinder from the top. The cleaning inlet includes a third inlet, and the third inlet communicates with the top cleaning channel.

8. A rotational viscometer according to claim 7, characterized in that, The top cleaning channel has a third flushing port, and there are multiple third flushing ports.

9. A rotational viscometer according to any one of claims 2 to 8, characterized in that, It also includes a top adapter seat, which is located between the top seat and the detection assembly. There is a gap between the inner cylinder shaft and the top seat and the top adapter seat. The top adapter seat is provided with a blowing channel for blowing air into the gap.

10. A rotational viscometer according to any one of claims 2 to 8, characterized in that, The cleaning outlet is arranged on the base.

11. A rotational viscometer according to any one of claims 2 to 8, characterized in that, The other end of the inner cylinder shaft is connected to the rotation angle recognition assembly through a magnetic transmission mechanism.

12. A rotational viscometer according to claim 11, characterized in that, The magnetic transmission mechanism includes an inner magnetic ring fixedly connected to the other end of the inner cylinder shaft and an outer magnetic ring sleeved separately therefrom; the inner magnetic ring is sleeved and fixed on the inner cylinder shaft and rotates together with the inner cylinder shaft; the outer magnetic ring and the rotating scale are sleeved on the upper rotating shaft to realize the synchronous magnetic drive of the inner and outer magnetic rings to drive the upper rotating shaft and the rotating scale to rotate, and further realize the synchronous rotation of the rotating scale and the inner rotating cylinder; the rotation angle recognition assembly includes a rotating scale and an encoder, and the encoder is used to read the rotation angle of the rotating scale.

13. A rotational viscometer according to any one of claims 2 to 8, characterized in that, It further includes a magnetic levitation assembly, which includes an upper magnetic ring and a lower magnetic ring. The upper magnetic ring is fixedly sleeved on the top of the other end of the inner cylinder shaft. The lower magnetic ring passes through the other end of the inner cylinder shaft and is fixedly arranged on the encoder protection cover. The same poles of the upper magnetic ring and the lower magnetic ring face each other.

14. A rotational viscometer according to claim 10, wherein, A multi-way valve for respectively discharging the tested medium or cleaning liquid to different volume pools is provided at the cleaning outlet.

15. A drilling fluid measurement system, including a control module, a pumping module and a measurement module, characterized in that the measurement module is the rotational viscosity measuring instrument according to any one of claims 1 to 14, and the control module is electrically connected to the pumping module and the measurement module; the pumping module is used to pump the medium to be measured or the cleaning liquid through the cleaning inlet to the rotational viscosity measuring instrument.

16. The drilling fluid measurement system according to claim 15, characterized in that, The measurement module includes a continuous measurement module and a discontinuous measurement module, and the rotational viscosity measuring instrument is a discontinuous measurement module.

17. The drilling fluid measurement system according to claim 16, characterized in that, The pumping module includes a first pumping module. When the measurement module includes a plurality of the continuous measurement modules and a plurality of the discontinuous measurement modules, the plurality of continuous measurement modules are connected in series through pipelines. The first pumping module is communicated with the first continuous measurement module, and the last continuous measurement module is respectively connected in parallel with the discontinuous measurement module through pipelines.

18. The drilling fluid measurement system according to claim 17, wherein, The pumping module includes a second pumping module for pumping the cleaning liquid through a pipeline to the discontinuous measurement module.

19. The drilling fluid measurement system according to claim 16, characterized in that, The continuous measurement module includes a density measurement module, a pH value measurement module and a chloride ion measurement module, and the discontinuous measurement module further includes a filtration loss measurement module and a solid content measurement module.

20. The drilling fluid measurement system according to any one of claims 15 to 19, characterized in that It further includes a cleaning air source. The pumping module has a pumping outlet, and the cleaning air source is communicated with the pumping outlet through an air pipe.

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