Device for Measuring Rheology of Drilling Fluid after Acid Gas Pollution under Ultra-High Temperature and Pressure Conditions

Abstract

The present invention relates to the technical field of drilling fluid measurement, and particularly discloses a device for measuring the rheology of drilling fluid after being polluted by acid gas under ultra-high temperature and pressure conditions. The technical solution is as follows: It includes a lower sealing shell, with drilling fluid filled in the inner cavity of the lower sealing shell, and a rotating outer cylinder is rotatably installed in the inner cavity of the lower sealing shell; an upper sealing shell is installed at the upper opening of the lower sealing shell, and a sealing gasket is provided between the two, and a laser emitter is directly opposite to a reflector; a large gear is meshed on the outside of a small gear, and the large gear is rotatably installed on the upper inner wall of the upper sealing shell. The beneficial effect of the present invention is that a reflector is fixedly installed at the upper end of a suspension shaft, and a laser emitter at the same horizontal position as the reflector is arranged on the outside of the upper sealing shell. For drilling fluids with different viscosities under different conditions, the deflection angle of the reflector varies greatly. This device can adjust the installation position of the laser emitter by rotating a rotating ring to ensure that the viscosity data of the drilling fluid obtained after measurement and calculation is more accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of oil drilling fluid measurement, and particularly relates to a device for measuring the rheology of drilling fluid after being polluted by acidic gas under ultra-high temperature and pressure conditions. Background Technique

[0002] During the oil drilling process, various circulating fluids that meet the needs of drilling work with multiple functions are called drilling fluids. According to the dispersion medium (continuous phase), they can be divided into water-based drilling fluids, oil-based drilling fluids, and gas-type drilling fluids.

[0003] In the prior art, the Chinese patent document with the publication number CN107860687B discloses a high-temperature and high-pressure and low-temperature and high-pressure rheometer, which includes an outer cylinder driven to rotate by a magnet and an inner cylinder that is passively deflected under the influence of the viscosity of the drilling fluid, solving the test requirements of the drilling fluid rheometer from -10°C to 320°C and from atmospheric pressure to 220 Mpa.

[0004] However, currently, when the measurement equipment of the traditional rheometer is working, it is easily affected by other surrounding magnets (magnetic fields), resulting in inaccurate measurement data of the deflection angle of the inner cylinder, thus affecting the measurement and calculation of the viscosity of the drilling fluid. Moreover, due to the relatively small viscosity of the water-based drilling fluid itself, when the change in the deflection angle of the inner cylinder is not obvious, it is difficult for the measurement equipment to respond in a timely manner, further amplifying the measurement error of the viscosity of the drilling fluid.

[0005] Therefore, the present invention proposes a device for measuring the rheology of drilling fluid after being polluted by acidic gas under ultra-high temperature and pressure conditions to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to address the above-mentioned defects existing in the prior art and provide a device for measuring the rheology of drilling fluid after being polluted by acidic gas under ultra-high temperature and pressure conditions to solve the problem of large measurement and calculation errors of the viscosity of the drilling fluid by the traditional rheometer.

[0007] A device for measuring the rheology of drilling fluid after being polluted by acidic gas under ultra-high temperature and pressure conditions mentioned in the present invention has the following technical solution: It includes a lower sealing shell and an upper sealing shell. The inner cavity of the lower sealing shell is filled with drilling fluid.

[0008] A rotating outer cylinder is rotatably installed in the inner cavity of the lower sealing shell. A rotating inner cylinder rotates in the inner cavity of the rotating outer cylinder. A suspension shaft is fixedly arranged at the upper end of the rotating inner cylinder, and a vertically placed reflecting plate is fixedly installed at the upper end of the suspension shaft.

[0009] The upper sealing shell is installed at the upper opening of the lower sealing shell. An annular viewing window at the same horizontal height as the reflecting plate is provided on the outer side wall of the upper sealing shell, and an annular scale is provided on the surface of the annular viewing window. A laser emitter is rotatably installed on the outer side of the upper sealing shell, and the laser emitter is directly opposite the reflecting plate.

[0010] Above the reflector, a small gear fixed to the suspension shaft is provided. An outer side of the small gear is engaged with a large gear, and the large gear is rotatably installed on an inner wall of an upper end of the upper sealing shell. A circular viewing window corresponding to the large gear is arranged on an upper end surface of the upper sealing shell, and an arc scale is provided on the circular viewing window.

[0011] Preferably, the above-mentioned annular viewing window and circular viewing window are made of tempered glass. Both upper and lower sides of the annular viewing window are provided with annular grooves opened on an outer side wall of the upper sealing shell. A rotating ring is rotatably installed in an inner cavity of the annular groove. An installation frame is fixedly installed on an outer side of the laser emitter, and two ends of the installation frame are respectively fixedly connected to the two rotating rings.

[0012] Preferably, a plurality of positioning grooves distributed in an annular array are opened on an outer side wall of the above-mentioned upper sealing shell. A positioning convex block is fixedly arranged on an outer side of the installation frame. A positioning ball is movably embedded on a side surface of the positioning convex block, and a thrust spring is arranged between the positioning ball and the positioning convex block. The thrust spring pushes the positioning ball to be stuck into an inner cavity of a positioning groove.

[0013] Preferably, a convex plate is fixedly arranged at an upper end of the above-mentioned suspension shaft. A cross section of the convex plate is semi-circular. The reflector is connected to the convex plate by screws. The small gear is horizontally installed on a top of the convex plate by bolts. An annular boss is sleeved on a middle part of the suspension shaft, and the annular boss is rotatably installed in an inner cavity of the connecting frame.

[0014] Preferably, the above-mentioned connecting frame includes an annular cover formed by connecting a lower collar and an upper collar. The annular cover is rotatably sleeved on an outer side of the annular boss through a bearing, and a torsion spring is fixedly installed between the two. A shaft sleeve is fixedly arranged at a lower end of the annular cover, and the shaft sleeve is movably sleeved on an outer side of the suspension shaft.

[0015] Preferably, a plurality of annular partitions distributed at equal intervals in a vertical direction and a plurality of vertical baffles distributed in an annular array are fixedly installed between an outer side wall of the above-mentioned annular cover and an inner side wall of the upper sealing shell. The annular partitions and the vertical baffles are perpendicular and cross each other. Through holes are formed through surfaces of the annular partitions.

[0016] Preferably, a driving ring is rotatably installed on an outer side of the lower sealing shell. A first magnet and a second magnet are respectively fixedly installed on an inner wall of the driving ring and an outer side wall of the rotating outer cylinder, and the first magnet and the second magnet attract each other. Annular teeth are arranged on an outer side wall of the driving ring. Rolling bodies are movably embedded on upper and lower surfaces of the driving ring. Retaining rings are fixedly arranged on an outer side wall of the lower sealing shell and located on upper and lower sides of the driving ring respectively.

[0017] Preferably, a bottom plate is fixedly arranged at the bottom of the above-mentioned rotating outer cylinder, a bottom cylinder is fixedly arranged on the lower surface of the bottom plate, and a circulation groove hole is arranged on the surface of the bottom cylinder. A plurality of through grooves distributed in an annular array are arranged on the surface of the bottom plate. An activity baffle is rotatably installed in the inner cavity of the through groove, and the activity baffle is inclined at 30 degrees.

[0018] Preferably, a linkage rod is rotatably installed at the edge of the above-mentioned activity baffle. One end of the linkage rod is rotatably connected to a piston rod. A receiving cavity for the piston rod to be movably inserted is arranged on the inner wall of one side of the through groove. A damping hole is arranged on the inner wall of the receiving cavity. The drilling fluid in the inner cavity of the lower sealing shell enters the inner cavity of the receiving cavity through the damping hole.

[0019] Preferably, a rotating shaft is fixedly arranged at the center of the lower surface of the above-mentioned bottom plate. A booster head is fixedly arranged at the bottom of the lower sealing shell. An air inlet pipe is connected to the lower end of the booster head. A one-way valve is arranged in the inner cavity of the booster head. A plurality of air holes distributed in an annular array are arranged through the inner cavity of the booster head, and the air holes are communicated with the inner cavity of the lower sealing shell. A bottom frame is fixedly arranged at the bottom of the lower sealing shell, and a liquid replacement pipe is connected to the bottom of the lower sealing shell.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] In the present invention, a reflector is fixedly installed at the upper end of the suspension shaft. A laser emitter located at the same horizontal position as the reflector is arranged outside the upper sealing shell. The laser emitted by the laser emitter is reflected by the reflector and then irradiates on the annular scale. The deflection angle of the reflector can be measured without contact, and the relative error generated by the measurement is reduced. A rotating ring is rotatably installed on the outer side wall of the upper sealing shell. The laser emitter is fixed on the rotating ring through a mounting frame. For drilling fluids with different viscosities under different conditions, the deflection angles of the reflector vary greatly. The present invention can adjust the installation position of the laser emitter by rotating the rotating ring, so as to accurately measure the deflection angle of the reflector at any position and ensure that the viscosity data of the drilling fluid obtained after measurement and calculation is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a three-dimensional schematic diagram of the overall structure of the present invention;

[0023] Figure 2 is an internal schematic diagram of the overall structure of the present invention;

[0024] Figure 3 is an exploded schematic diagram of the structure of the rotating inner cylinder of the present invention;

[0025] Figure 4 is the present invention Figure 3 is an enlarged schematic diagram of the structure at A in the present invention;

[0026] Figure 5Explosion schematic diagram of the reflector and suspension shaft structure of the present invention;

[0027] Figure 6 Internal schematic diagram of the upper sealing shell structure of the present invention;

[0028] Figure 7 Explosion schematic diagram of the connecting frame structure of the present invention;

[0029] Figure 8 Schematic diagram of the upper sealing shell structure of the present invention cut open;

[0030] Figure 9 Three-dimensional schematic diagram of the rotating ring structure of the present invention;

[0031] Figure 10 Explosion schematic diagram of the rotating outer cylinder structure of the present invention;

[0032] Figure 11 Partial cut-open schematic diagram of the bottom plate structure of the present invention;

[0033] Figure 12 Half-sectional schematic diagram of the driving ring structure of the present invention;

[0034] Figure 13 Curve graph of the rheological property measurement result of the drilling fluid of the present invention.

[0035] In the above figure: 1. Lower sealing shell; 11. Driving ring; 111. Ring teeth; 112. Magnet 1; 113. Rolling body; 12. Pressure increasing head; 121. Check valve; 122. Air inlet pipe; 123. Air vent hole; 13. Underframe; 14. Liquid changing pipe; 2. Rotating outer cylinder; 21. Magnet 2; 22. Bottom plate; 221. Through groove; 222. Movable baffle; 223. Storage cavity; 224. Piston rod; 225. Linking rod; 226. Damping hole; 23. Bottom cylinder; 231. Circulation groove hole; 24. Rotating shaft; 3. Rotating inner cylinder; 4. Suspension shaft; 41. Ring-shaped convex platform; 42. Convex plate; 43. Small gear; 44. Large gear; 45. Torsion spring; 46. Bearing; 5. Connecting frame; 51. Lower collar; 511. Upper collar; 52. Ring-shaped partition; 53. Vertical baffle; 54. Through hole; 6. Upper sealing shell; 61. Ring-shaped viewing window; 62. Ring-shaped scale; 63. Ring-shaped groove; 631. Rotating ring; 64. Positioning groove; 65. Circular viewing window; 66. Arc-shaped scale; 67. Sealing gasket; 7. Reflector; 8. Laser emitter; 81. Mounting frame; 82. Positioning convex block; 83. Positioning ball; 84. Thrust spring; 9. Bush. Detailed implementation manners

[0036] The following describes the preferred embodiments of the present invention with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0037] Example 1, refer to Figures 1 to 13 , the present invention provides a device for measuring the rheology of drilling fluid after being polluted by acidic gas under ultra-high temperature and pressure conditions, including: a lower sealing shell 1 and an upper sealing shell 6. Drilling fluid is filled in the inner cavity of the lower sealing shell 1. A bottom frame 13 is fixed at the bottom of the lower sealing shell 1. A liquid replacement pipe 14 is connected to the bottom of the lower sealing shell 1. The drilling fluid is injected into or drained from the inner cavity of the lower sealing shell 1 through the liquid replacement pipe 14. Different types of drilling fluids (such as water-based drilling fluid or oil-based drilling fluid) can be injected into the inner cavity of the lower sealing shell 1 through the liquid replacement pipe 14. A rotating outer cylinder 2 is rotatably installed in the inner cavity of the lower sealing shell 1. A rotating inner cylinder 3 rotates in the inner cavity of the rotating outer cylinder 2. When the rotating outer cylinder 2 rotates, the rotating inner cylinder 3 can be driven to deflect through the viscosity of the drilling fluid. By measuring the deflection angle of the rotating inner cylinder 3, the viscosity of the corresponding drilling fluid can be measured and calculated. A temperature control system known in the prior art is also provided on the outer side of the lower sealing shell 1 for cooling or heating the drilling fluid in the inner cavity of the lower sealing shell 1, and the rheology of the drilling fluid is measured and calculated under different temperature conditions. A suspension shaft 4 is fixedly arranged at the upper end of the rotating inner cylinder 3. A vertically placed reflector 7 is fixedly installed at the upper end of the suspension shaft 4. The orientation of the reflector 7 deflects as the rotating inner cylinder 3 deflects;

[0038] Further, the upper sealing shell 6 is installed at the upper opening of the lower sealing shell 1, and a sealing gasket 67 is provided between the two. The upper sealing shell 6 is used to seal the upper opening of the lower sealing shell 1 to ensure that the inner cavity of the lower sealing shell 1 is a sealed structure. An annular viewing window 61 at the same horizontal height as the reflector 7 is provided on the outer side wall of the upper sealing shell 6, and an annular scale 62 is provided on the surface of the annular viewing window 61. A laser emitter 8 is rotatably installed on the outer side of the upper sealing shell 6. The laser emitter 8 is directly opposite to the reflector 7. The laser emitter 8 emits a laser ray that irradiates on the surface of the reflector 7. After being reflected by the reflector 7, the reflected light irradiates on the annular viewing window 61. The staff can measure the angle between the incident light and the reflected light by comparing the annular scale 62, so as to know the deflection angle of the reflector 7. And the reflector 7 reflects the laser ray, which can magnify the deflection angle of the reflector 7 by two times, thereby reducing the relative error generated during measurement. Compared with the traditional measurement device that uses a magnetic angle sensor to measure the deflection angle, the present invention can avoid being interfered by the magnetic field and improve the measurement accuracy on the premise of non-contact measurement;

[0039] In addition, a small gear 43 fixed to the suspension shaft 4 is provided above the reflector 7. A large gear 44 is meshed on the outer side of the small gear 43, and the large gear 44 is rotatably installed on the upper inner wall of the upper sealing shell 6. A circular viewing window 65 corresponding to the large gear 44 is provided on the upper end surface of the upper sealing shell 6, and an arc scale 66 is provided on the circular viewing window 65, such as Figure 5As shown, an indicating arrow is provided on the surface of the large gear 44. When the reflector 7 is not deflected, the large gear 44 points to the "zero" scale line on the arc scale 66, and the laser reflected by the reflector 7 irradiates the "zero" scale line on the annular scale 62. When the deflection angle of the reflector 7 is too large and exceeds one full circle, the small gear 43 can drive the large gear 44 to rotate, so that the indicating arrow on the surface of the large gear 44 points to the "one" scale line on the arc scale 66. This indicates that the angle data measured by the annular scale 62 at this time needs to be increased by an additional three hundred and sixty degrees. And so on, the present invention can measure the angle of the reflector 7 after deflecting several circles, increasing the measurement range, thereby ensuring that the present invention can measure water-based drilling fluids and oil-based drilling fluids with large viscosity differences, as well as their rheological properties under different temperature and pressure conditions;

[0040] In addition, a pressure booster head 12 is fixed to the bottom of the lower sealing shell 1, and an air inlet pipe 122 is connected to the lower end of the pressure booster head 12. A one-way valve 121 is arranged in the inner cavity of the pressure booster head 12. The air inlet pipe 122 is used to introduce carbon dioxide gas into the inner cavity of the lower sealing shell 1. Due to the gradual expansion of oil and gas exploration, the frequency of drilling through formations containing carbon dioxide gas is increasing continuously, and the drilling fluid is sometimes polluted by carbon dioxide gas. After the carbon dioxide gas enters the drilling fluid, according to the different pH values of the drilling fluid, there will be H 2 CO 3 、HCO 3 - and CO 3 2- existing in the drilling fluid in three forms. When the concentrations of HCO 3 - and CO 3 2- in the drilling fluid increase, the viscosity of the drilling fluid will change. Therefore, the present invention can simulate the environment in the actual exploration process by introducing carbon dioxide gas into the drilling fluid in the inner cavity of the lower sealing shell 1 through the air inlet pipe 122. At the same time, since the inner cavity of the lower sealing shell 1 is sealed, after introducing carbon dioxide gas, the pressure in its inner cavity will increase, so that the pressure of the drilling fluid can be simulated and adjusted. By controlling variables, the present invention can measure the rheological properties of the drilling fluid under different temperatures, different pressures, and conditions of being polluted by carbon dioxide at different concentrations. A plurality of air holes 123 distributed in an annular array are formed through the inner cavity of the pressure booster head 12, and the air holes 123 communicate with the inner cavity of the lower sealing shell 1. The inner diameter of the air holes 123 is small, which is convenient for the carbon dioxide gas to quickly pollute the drilling fluid;

[0041] Taking the oil-based drilling fluid as an example, the present invention combines Figure 13As shown, the rheological curves of oil-based drilling fluids under a constant pressure of 180 MPa and different temperatures were measured. It can be seen that under the same temperature conditions, the shear stress of the oil-based drilling fluid sample increases with the increase of the shear rate. After the shear rate reaches a certain specific value, the increasing trend of the shear pressure will slow down. Secondly, when the temperature is 30 °C, in the shear rate range of 200 - 350 s -1 interval, the shear stress of the drilling fluid will instead show a downward trend;

[0042] When the present invention is in use, the temperature and pressure can be adjusted according to actual needs. It can simulate a high-pressure environment exceeding 200 MPa and a high-temperature environment exceeding 250 °C at most. By separately testing water-based and oil-based drilling fluids under high-temperature and high-pressure environments, it can be more in line with the actual underground drilling environment and ensure the authenticity and effectiveness of the measurement result data.

[0043] In order to adjust the position of the laser emitter 8, both the annular window 61 and the circular window 65 of the present invention are made of tempered glass, which has higher strength and can withstand greater pressure in the inner cavity of the lower sealing shell 1. Annular grooves 63 are provided on both the upper and lower sides of the annular window 61 and are opened on the outer side wall of the upper sealing shell 6. A rotating ring 631 is rotatably installed in the inner cavity of the annular groove 63. An installation frame 81 is fixedly installed on the outer side of the laser emitter 8, and both ends of the installation frame 81 are fixedly connected to the two rotating rings 631 respectively, as Figure 8 and Figure 9 shown. By pushing the installation frame 81, the staff can drive the laser emitter 8 to rotate around the upper sealing shell 6, thereby changing the position of the laser emitter 8 and the incident angle of the laser emitted by the laser emitter 8. Moreover, when the position of the laser emitter 8 is changed, the laser it emits always irradiates on the center position of the reflector 7.

[0044] In order to prevent the position of the laser emitter 8 from shifting easily, the present invention also has a plurality of positioning grooves 64 arranged in an annular array on the outer side wall of the upper sealing shell 6. A positioning convex block 82 is fixedly provided on the outer side of the installation frame 81. A positioning ball 83 is movably embedded on the side of the positioning convex block 82, and a thrust spring 84 is arranged between the positioning ball 83 and the positioning convex block 82. The thrust spring 84 pushes the positioning ball 83 to be stuck into the inner cavity of a positioning groove 64, as Figure 9 shown. The thrust spring 84 can be received in the inner cavity of the positioning convex block 82 and compressed by the thrust spring 84. Therefore, the thrust generated by the thrust spring 84 on the positioning ball 83 can stick the positioning ball 83 into the inner cavity of the positioning groove 64. Therefore, after the position of the laser emitter 8 is changed by pushing the installation frame 81 in the present invention, the cooperation between the positioning ball 83 and the positioning groove 64 can ensure the stability of the position of the laser emitter 8 and prevent it from shifting easily.

[0045] To install the reflector 7, the present invention further has a convex plate 42 fixedly arranged at the upper end of the suspension shaft 4. The cross-section of the convex plate 42 is semi-circular. The reflector 7 is fixedly connected to the convex plate 42 by screws. As Figure 5 shown, after the reflector 7 and the convex plate 42 are fixedly installed, the symmetry line of the reflector 7 coincides exactly with the axis of the suspension shaft 4. Therefore, during the deflection process of the reflector 7, the laser emitted by the laser emitter 8 always irradiates at the specified position on the surface of the reflector 7, that is, the position of the incident light remains unchanged all the time, and only the reflected light changes with the deflection of the reflector 7. The pinion 43 is horizontally fixedly installed on the top of the convex plate 42 by bolts and will not collide with the reflector 7. The pinion 43 is concentric with the suspension shaft 4 and can rotate synchronously with the suspension shaft 4, and its own position will not shift. Therefore, the pinion 43 can always remain meshed with the large gear 44. An annular boss 41 is fixedly sleeved in the middle of the suspension shaft 4, and the annular boss 41 is rotatably installed in the inner cavity of the connecting frame 5. The cooperation between the large gear 44 and the connecting frame 5 is mainly used to position the suspension shaft 4 to ensure that the suspension shaft 4 can only rotate and will not shift in position.

[0046] To avoid the influence of drilling fluid on the surface of the suspension shaft 4, the connecting frame 5 of the present invention includes an annular cover formed by fixedly connecting a lower collar 51 and an upper collar 511. The annular cover is rotatably sleeved on the outside of the annular boss 41 through a bearing 46, and a torsion spring 45 is fixedly installed between the two. Combining Figure 5 、 Figure 6 and Figure 7 shown, since the position of the connecting frame 5 itself is fixed and the suspension shaft 4 can rotate, the suspension shaft 4 can compress the torsion spring 45 when it rotates. It can be seen that the torque generated by the torsion spring 45 on the suspension shaft 4 after being compressed is exactly equal to the torque generated by the drilling fluid on the side wall of the rotating inner cylinder 3 due to viscosity. The degree of compression of the torsion spring 45 is proportional to its rotation angle, that is, T = F×r = k×θ×r, where T is the torque of the torsion spring, F is the spring restoring force, r is the radius of the torsion spring, θ is the deformation angle of the torsion spring (i.e., the deflection angle of the reflector 7 and the suspension shaft 4 in the present invention), and k is the elastic coefficient of the torsion spring. Thus, the magnitude of the torsion force generated by the drilling fluid on the side wall of the rotating inner cylinder 3 due to viscosity can be calculated, and then the viscosity of the drilling fluid can be calculated. A shaft sleeve 9 is fixedly arranged at the lower end of the annular cover, and the shaft sleeve 9 is movably sleeved on the outside of the suspension shaft 4. The shaft sleeve 9 is provided to shield the surface of the suspension shaft 4 to avoid the viscous effect of the drilling fluid on the surface of the suspension shaft 4. Therefore, the present invention only needs to calculate the interaction between the drilling fluid and the surface of the rotating inner cylinder 3.

[0047] To avoid the rotation of excess drilling fluid, the present invention further includes a plurality of annular partitions 52 fixedly installed at equal intervals in the vertical direction between the outer sidewall of the annular cover and the inner sidewall of the upper sealing shell 6, and a plurality of vertical baffles 53 distributed in an annular array. The annular partitions 52 and the vertical baffles 53 are perpendicular and intersect each other. Through holes 54 are formed through the surface of the annular partitions 52. The annular partitions 52 are provided to prevent the drilling fluid from splashing everywhere when rotating and flowing, and the vertical baffles 53 are provided to block the rotation of the drilling fluid around the connecting frame 5, ensuring that only the drilling fluid around the rotating outer cylinder 2 and the rotating inner cylinder 3 of the present invention can rotate.

[0048] To drive the rotation of the rotating outer cylinder 2, the present invention further includes a driving ring 11 rotatably installed on the outer side of the lower sealing shell 1. A first magnet 112 and a second magnet 21 are respectively fixedly installed on the inner wall of the driving ring 11 and the outer sidewall of the rotating outer cylinder 2, and the two attract each other. When the driving ring 11 rotates, it drives the rotating outer cylinder 2 to rotate in a non-contact manner. An annular tooth 111 is formed on the outer sidewall of the driving ring 11. The driving ring 11 is driven to rotate by an external motor. A main gear is provided at the output end of the motor and meshes with the annular tooth 111. Rolling bodies 113 are movably embedded on the upper and lower surfaces of the driving ring 11. Stopping rings are fixedly provided on the outer sidewall of the lower sealing shell 1 and located on the upper and lower sides of the driving ring 11 respectively. The stopping rings are provided to position the driving ring 11, ensuring that the driving ring 11 can only rotate and will not be separated from the lower sealing shell 1. The rolling bodies 113 are provided to reduce the friction generated between the driving ring 11 and the lower sealing shell 1 when the driving ring 11 rotates.

[0049] To quickly and evenly contaminate the drilling fluid with carbon dioxide gas, the present invention further includes a bottom plate 22 fixedly provided at the bottom of the rotating outer cylinder 2. A bottom cylinder 23 is fixed to the lower surface of the bottom plate 22, and a circulation groove hole 231 is formed on the surface of the bottom cylinder 23. A plurality of through grooves 221 distributed in an annular array are formed on the surface of the bottom plate 22. A movable baffle 222 that seals the through groove 221 is rotatably installed in the inner cavity of the through groove 221. The movable baffle 222 is inclined at thirty degrees, as Figure 10 and Figure 11As shown, when the outer rotating cylinder 2 rotates forward, the movable baffle 222 will be folded and stored in the inner cavity of the through groove 221 under the extrusion of the drilling fluid below. At this time, the lower end of the outer rotating cylinder 2 is sealed, and the inner rotating cylinder 3 in the inner cavity of the outer rotating cylinder 2 can rotate under the action of the viscosity of the drilling fluid. When it is necessary to introduce carbon dioxide gas into the inner cavity of the lower sealing shell 1 to contaminate the drilling fluid and increase the pressure in the inner cavity of the lower sealing shell 1, the outer rotating cylinder 2 of the present invention is rotated in the reverse direction. At this time, the movable baffle 222 rotates downward and unfolds by thirty degrees, so that during the rotation of the bottom plate 22, the drilling fluid can be driven to gradually flow upward in the inner cavity of the outer rotating cylinder 2. At this time, the drilling fluid rotates while circulating up and down, thus ensuring that the carbon dioxide gas can uniformly and quickly mix and contaminate the drilling fluid to quickly simulate the actual exploration environment.

[0050] In order to prevent the movable baffle 222 from shaking easily, the present invention also has a linkage rod 225 rotatably installed at the edge of the movable baffle 222. One end of the linkage rod 225 is rotatably connected to a piston rod 224. A receiving cavity 223 for the piston rod 224 to movably insert is provided on one inner wall of the through groove 221. A damping hole 226 is provided on the inner wall of the receiving cavity 223. The drilling fluid in the inner cavity of the lower sealing shell 1 enters the inner cavity of the receiving cavity 223 through the damping hole 226, as Figure 11 shown. During the rotation and unfolding process of the movable baffle 222, the piston rod 224 can be driven to slide in the inner cavity of the receiving cavity 223 through the connection of the linkage rod 225. Since the drilling fluid can enter the inner cavity of the receiving cavity 223 through the damping hole 226 and the inner diameter of the damping hole 226 is small, the viscosity of the drilling fluid itself and the small aperture of the damping hole 226 can produce a damping effect on the sliding of the piston rod 224, thereby producing a damping effect on the rotation of the movable baffle 222 to ensure the stable position of the movable baffle 222 after unfolding and prevent it from shaking easily. In addition, the cooperation of the piston rod 224 and the linkage rod 225 can also limit the rotation and unfolding angle of the movable baffle 222 to prevent its unfolding angle from being too large.

[0051] In order to rotatably install the outer rotating cylinder 2, the present invention also has a rotating shaft 24 fixed at the center of the lower surface of the bottom plate 22. The rotating shaft 24 is rotatably installed at the upper end of the pressure booster head 12. The cooperation between the rotating shaft 24 and the pressure booster head 12 is mainly used for rotatably installing the whole outer rotating cylinder 2.

[0052] The above are only some preferred embodiments of the present invention. Any person skilled in the art may modify the above-described technical solutions or modify them into equivalent technical solutions. Therefore, the corresponding simple modifications or equivalent transformations made according to the technical solutions of the present invention all fall within the scope of protection required by the present invention.

Claims

1. A device for measuring rheological properties of drilling fluid contaminated by acidic gas under ultra-high temperature and pressure conditions, comprising a lower sealing shell (1) and an upper sealing shell (6), wherein the inner cavity of the lower sealing shell (1) is filled with drilling fluid, and wherein: A rotating outer cylinder (2) is rotatably mounted in the inner cavity of the lower sealing shell (1), a rotating inner cylinder (3) is rotatably mounted in the inner cavity of the rotating outer cylinder (2), a suspension shaft (4) is fixedly mounted on the upper end of the rotating inner cylinder (3), and a vertically placed reflection plate (7) is fixedly mounted on the upper end of the suspension shaft (4); The upper sealing shell (6) is mounted at the upper end opening of the lower sealing shell (1); an outer wall of the upper sealing shell (6) is provided with an annular window (61) located at the same level as the reflector (7); a surface of the annular window (61) is provided with an annular scale (62); a laser emitter (8) is rotatably mounted on the outer side of the upper sealing shell (6); the laser emitter (8) faces the reflector (7); A small gear (43) fixed to the suspension shaft (4) is arranged above the reflector plate (7); a large gear (44) is arranged on the outer side of the small gear (43) in meshing engagement with the large gear (44); and the large gear (44) is rotatably mounted on the upper inner wall of the upper sealing shell (6); a circular window (65) corresponding to the large gear (44) is arranged on the upper end surface of the upper sealing shell (6); and an arc-shaped scale (66) is provided on the circular window (65).

2. The device for measuring rheological properties of drilling fluid contaminated by acidic gas under ultra-high temperature and pressure conditions according to claim 1 is characterized by: The annular window (61) and the circular window (65) are made of tempered glass. An annular groove (63) opened on the outer wall of the upper sealing shell (6) is provided on both upper and lower sides of the annular window (61). A rotating ring (631) is rotatably mounted in the inner cavity of the annular groove (63). A mounting frame (81) is fixedly mounted on the outer side of the laser emitter (8), and two ends of the mounting frame (81) are respectively fixedly connected to the two rotating rings (631).

3. The device for measuring rheological properties of drilling fluid contaminated by acidic gas under ultra-high temperature and pressure conditions according to claim 2 is characterized in that: The outer wall of the upper sealing shell (6) is provided with a plurality of positioning grooves (64) distributed in a ring array, a positioning protrusion (82) is fixedly provided on the outer side of the mounting frame (81), a positioning ball (83) is movably embedded on the side of the positioning protrusion (82), and a thrust spring (84) is provided between the positioning ball (83) and the positioning protrusion (82), and the thrust spring (84) pushes the positioning ball (83) to be stuck into the inner cavity of a positioning groove (64).

4. The device for measuring rheological properties of drilling fluid contaminated by acidic gas under ultra-high temperature and pressure conditions according to claim 3 is characterized by: A convex plate (42) is fixedly provided at the upper end of the suspension shaft (4), and the cross section of the convex plate (42) is semicircular. The reflector plate (7) is connected to the convex plate (42) by means of screws. The pinion gear (43) is horizontally mounted on the top of the convex plate (42) by means of bolts. An annular boss (41) is sleeved on the middle part of the suspension shaft (4), and the annular boss (41) is rotatably mounted in the inner cavity of the connecting frame (5).

5. The device for measuring rheological properties of drilling fluid contaminated by acidic gas under ultra-high temperature and pressure conditions according to claim 4 is characterized in that: The connecting frame (5) comprises an annular cover formed by connecting a lower sleeve ring (51) and an upper sleeve ring (511); the annular cover is rotatably sleeved on the outer side of the annular boss (41) via a bearing (46); a torsion spring (45) is fixedly installed between the two; a shaft sleeve (9) is fixedly provided at the lower end of the annular cover, and the shaft sleeve (9) is movably sleeved on the outer side of the suspension shaft (4).

6. The device for measuring rheological properties of drilling fluid contaminated by acidic gas under ultra-high temperature and pressure conditions according to claim 5 is characterized by: A plurality of annular baffles (52) vertically distributed at equal intervals and a plurality of vertical baffles (53) distributed in an annular array are fixedly mounted between the outer side wall of the annular cover and the inner side wall of the upper sealing shell (6); the annular baffles (52) and the vertical baffles (53) intersect each other perpendicularly, and a through hole (54) is formed through the surface of the annular baffle (52).

7. The device for measuring rheological properties of drilling fluid contaminated by acidic gas under ultra-high temperature and pressure conditions according to claim 6 is characterized by: A driving ring (11) is rotatably mounted on the outer side of the lower sealing shell (1), and magnet one (112) and magnet two (21) are fixedly mounted on the inner wall of the driving ring (11) and the outer wall of the rotating outer cylinder (2), respectively, and magnet one (112) and magnet two (21) attract each other; an annular tooth (111) is formed on the outer wall of the driving ring (11), and rolling bodies (113) are movably embedded on the upper and lower surfaces of the driving ring (11), and retaining rings are fixedly mounted on the upper and lower sides of the driving ring (11), respectively.

8. The device for measuring rheological properties of drilling fluid contaminated by acidic gas under ultra-high temperature and pressure conditions according to claim 7 is characterized by: A bottom plate (22) is fixedly arranged at the bottom of the rotating outer cylinder (2), a bottom cylinder (23) is fixed to the lower surface of the bottom plate (22), and a circulation slot hole (231) is provided on the surface of the bottom cylinder (23), a plurality of through slots (221) distributed in a circular array are provided on the surface of the bottom plate (22), and a movable baffle (222) is rotatably installed in the inner cavity of the through slot (221), and the movable baffle (222) is inclined at thirty degrees.

9. The device for measuring rheological properties of drilling fluid contaminated by acidic gas under ultra-high temperature and pressure conditions according to claim 8, characterized in that: A linkage rod (225) is rotatably mounted at the edge of the movable baffle (222), one end of the linkage rod (225) is rotatably connected to a piston rod (224), a receiving chamber (223) for movably inserting the piston rod (224) is provided on an inner wall of one side of the through groove (221), a damping hole (226) is provided on the inner wall of the receiving chamber (223), and drilling fluid in the inner cavity of the lower sealing shell (1) enters the inner cavity of the receiving chamber (223) through the damping hole (226).

10. The device for measuring rheological properties of drilling fluid contaminated by acidic gas under ultra-high temperature and pressure conditions according to claim 9, characterized in that: A rotating shaft (24) is fixed at the center of the lower surface of the bottom plate (22); a booster head (12) is fixed to the bottom of the lower sealed shell (1), and the lower end of the booster head (12) is connected to an air intake pipe (122); a one-way valve (121) is provided in the inner cavity of the booster head (12); a plurality of aeration holes (123) distributed in a ring array are provided through the inner cavity of the booster head (12), and the aeration holes (123) are connected to the inner cavity of the lower sealed shell (1); a bottom frame (13) is fixed to the bottom of the lower sealed shell (1), and a liquid exchange pipe (14) is connected to the bottom of the lower sealed shell (1).

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