Device for measuring rheological property of drilling fluid polluted by acid gas under ultra-high temperature pressure condition

Abstract

The invention relates to the technical field of drilling fluid measurement, and particularly discloses a device for measuring rheological property of drilling fluid polluted by acid gas under an ultra-high-temperature pressure condition, and the technical scheme is that the device comprises a lower sealing shell, the inner cavity of the lower sealing shell is filled with drilling fluid, and a rotary outer cylinder is rotatably mounted in the inner cavity of the lower sealing shell; the upper sealing shell is mounted at the upper end opening of the lower sealing shell, a sealing gasket is arranged between the upper sealing shell and the lower sealing shell, and the laser transmitter directly faces the reflecting plate; a large gear is arranged on the outer side of the small gear in an engaged mode and rotationally installed on the inner wall of the upper end of the upper sealing shell. The device has the beneficial effects that the reflecting plate is fixedly installed at the upper end of the suspension shaft, the laser transmitter located at the same horizontal position as the reflecting plate is arranged on the outer side of the upper sealing shell, and the deflection angle difference of the reflecting plate is large under different conditions for drilling fluid with different viscosities; according to the device, the mounting position of the laser transmitter can be adjusted by rotating the rotating ring, and it is ensured that drilling fluid viscosity data obtained after measurement and calculation are more accurate.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum drilling fluid measurement, and in particular to a device for measuring rheological properties of drilling fluid contaminated by acidic gas under ultra-high temperature and pressure conditions. Background Art

[0002] During the oil drilling process, various circulating fluids that meet the needs of drilling work with their multiple functions are called drilling fluids. According to the dispersed 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 publication number CN107860687B discloses a high-temperature and high-pressure and low-temperature and high-pressure rheometer, including an outer cylinder driven to rotate by a magnet, and an inner cylinder passively deflected by the viscosity of the drilling fluid, which solves the drilling fluid rheometer testing needs from -10°C to 320°C and normal pressure to 220Mpa.

[0004] However, at present, the measuring equipment of traditional rheometers is easily affected by other surrounding magnets (magnetic fields) when working, resulting in inaccurate measurement data of the inner cylinder deflection angle, which affects the measurement and calculation of the drilling fluid viscosity. In addition, since the viscosity of water-based drilling fluid itself is relatively small, when the deflection angle of the inner cylinder does not change significantly, the measuring equipment is difficult to respond in time, which further causes the measurement error of the drilling fluid viscosity to be amplified.

[0005] To this end, the present invention proposes a device for measuring the rheological properties of drilling fluid contaminated 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 in the prior art and provide a device for measuring the rheological properties of drilling fluid contaminated by acidic gas under ultra-high temperature and pressure conditions to solve the problem of large measurement and calculation errors of drilling fluid viscosity by traditional rheometers.

[0007] The present invention provides a device for measuring rheological properties of drilling fluid contaminated by acidic gas under ultra-high temperature and pressure conditions. The device comprises a lower sealing shell and an upper sealing shell. The inner cavity of the lower sealing shell is filled with drilling fluid. The inner cavity of the lower sealing shell is rotatably mounted with a rotating outer cylinder, the inner cavity of the rotating outer cylinder is rotatably mounted with a rotating inner cylinder, the upper end of the rotating inner cylinder is fixedly mounted with a suspension shaft, and the upper end of the suspension shaft is fixedly mounted with a vertically placed reflection plate; The upper sealing shell is installed at the upper end opening of the lower sealing shell, and the outer side wall of the upper sealing shell is provided with an annular window located at the same level as the reflector, and an annular scale is provided on the surface of the annular window. A laser emitter is rotatably installed on the outer side of the upper sealing shell, and the laser emitter faces the reflector; A small gear fixed to the suspension shaft is arranged above the reflector plate, a large gear is meshed with the outer side of the small gear, and the large gear is rotatably mounted on the upper inner wall of the upper sealing shell, a circular window corresponding to the large gear is arranged on the upper end surface of the upper sealing shell, and an arc-shaped scale is opened on the circular window.

[0008] Preferably, the annular window and the circular window are made of tempered glass, and the upper and lower sides of the annular window are provided with annular grooves opened on the outer wall of the upper sealing shell, and a rotating ring is rotatably installed in the inner cavity of the annular groove. A mounting frame is fixedly installed on the outside of the laser emitter, and both ends of the mounting frame are fixedly connected to the two rotating rings respectively.

[0009] Preferably, the outer wall of the upper sealing shell is provided with a plurality of positioning grooves distributed in a circular array, a positioning protrusion is fixedly provided on the outer side of the mounting frame, a positioning ball is movably embedded on the side of the positioning protrusion, and a thrust spring is provided between the positioning ball and the positioning protrusion, and the thrust spring pushes the positioning ball into an inner cavity of a positioning groove.

[0010] Preferably, a convex plate is fixedly provided on the upper end of the above-mentioned suspension shaft, and the cross-section of the convex plate is semicircular. The reflective plate is connected to the convex plate by screws, and the pinion is horizontally installed on the top of the convex plate by bolts. An annular boss is provided in the middle part of the suspension shaft, and the annular boss is rotatably installed in the inner cavity of the connecting frame.

[0011] Preferably, the above-mentioned connecting frame includes an annular cover composed of a lower ring and an upper ring, the annular cover is rotatably mounted on the outer side of the annular boss through a bearing, and a torsion spring is fixedly installed between the two, and a shaft sleeve is fixedly arranged at the lower end of the annular cover, and the shaft sleeve is movably mounted on the outer side of the suspension shaft.

[0012] Preferably, a plurality of annular partitions vertically distributed at equal intervals and a plurality of vertical baffles distributed in an annular array are fixedly installed between the outer wall of the annular cover and the inner wall of the upper sealing shell. The annular partitions and the vertical baffles are perpendicularly crossed to each other, and through holes are opened through the surface of the annular partitions.

[0013] Preferably, a driving ring is rotatably installed on the outer side of the above-mentioned lower sealing shell, and magnet one and magnet two are fixedly installed on the inner wall of the driving ring and the outer wall of the rotating outer cylinder respectively, and magnet one and magnet two attract each other; the outer wall of the driving ring is provided with annular teeth, and rolling bodies are movably embedded on the upper and lower surfaces of the driving ring, and the outer wall of the lower sealing shell is fixedly provided with retaining rings respectively located on the upper and lower sides of the driving ring.

[0014] Preferably, a bottom plate is fixedly provided at the bottom of the rotating outer cylinder, a bottom cylinder is fixed on the lower surface of the bottom plate, and a circulation slot hole is provided on the surface of the bottom cylinder. A plurality of through slots distributed in a circular array are provided on the surface of the bottom plate, and a movable baffle is rotatably installed in the inner cavity of the through slot, and the movable baffle is inclined at thirty degrees.

[0015] Preferably, a linkage rod is rotatably installed at the edge of the movable baffle, one end of the linkage rod is rotatably connected to a piston rod, a storage chamber for movably inserting the piston rod is provided on the inner wall of one side of the through groove, a damping hole is provided on the inner wall of the storage chamber, and the drilling fluid in the inner cavity of the lower sealing shell enters the inner cavity of the storage chamber through the damping hole.

[0016] Preferably, a rotating shaft is fixed at the center of the lower surface of the above-mentioned base plate, a boost head is fixed to the bottom of the lower sealing shell, and the lower end of the boost head is connected to an air intake pipe, a one-way valve is provided in the inner cavity of the boost head, and a plurality of aeration holes distributed in a circular array are opened through the inner cavity of the boost head, and the aeration holes are connected to the inner cavity of the lower sealing shell, a base frame is fixed to the bottom of the lower sealing shell, and the bottom of the lower sealing shell is connected to a liquid exchange pipe.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention has a reflector plate fixedly mounted on the upper end of the suspension shaft, a laser emitter located at the same horizontal position as the reflector plate is arranged on the outer side of the upper sealing shell, the laser emitter emits laser light which is reflected by the reflector plate and then irradiated on the annular scale, so that the deflection angle of the reflector plate can be measured contactlessly and the relative error caused by the measurement can be reduced; a rotating ring is rotatably mounted on the outer side wall of the upper sealing shell, the laser emitter is fixed on the rotating ring through a mounting frame, and the deflection angle of the reflector plate varies greatly for drilling fluids of different viscosities under different conditions, the present invention can adjust the installation position of the laser emitter by rotating the rotating ring, so that the deflection angle of the reflector plate can be accurately measured at any position, ensuring that the drilling fluid viscosity data obtained after measurement and calculation is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the overall structure of the present invention; Figure 3 This is an exploded schematic diagram of the rotating inner cylinder structure of the present invention; Figure 4 For the present invention Figure 3 A schematic diagram of the structure enlargement in the middle; Figure 5 It is an exploded schematic diagram of the reflector and suspension shaft structure of the present invention; Figure 6 This is a schematic diagram of the interior of the upper sealing shell structure of the present invention; Figure 7 This is an exploded schematic diagram of the connecting frame structure of the present invention; Figure 8 This is a schematic cross-sectional view of the upper sealing shell structure of the present invention; Fig. 9 It is a three-dimensional schematic diagram of the rotating ring structure of the present invention; Fig.10 This is an exploded schematic diagram of the rotating outer cylinder structure of the present invention; Fig.11 It is a partial cutaway schematic diagram of the bottom plate structure of the present invention; Fig.12 A half-section schematic diagram of the drive ring structure of the present invention; Fig.13 The figure is a graph showing the rheological measurement results of the drilling fluid according to the present invention.

[0019] In the figure above: 1. Lower sealing shell; 11. Driving ring; 111. Annular gear; 112. Magnet 1; 113. Rolling element; 12. Booster head; 121. One-way valve; 122. Inlet pipe; 123. Aeration hole; 13. Base frame; 14. Liquid exchange pipe; 2. Rotating outer cylinder; 21. Magnet 2; 22. Bottom plate; 221. Through groove; 222. Movable baffle; 223. Storage chamber; 224. Piston rod; 225. Linkage rod; 226. Damping hole; 23. Bottom cylinder; 231. Circulation slot hole; 24. Rotating shaft; 3. Rotating inner cylinder; 4. Suspension shaft; 41. Annular boss ; 42. convex plate; 43. small gear; 44. large gear; 45. torsion spring; 46. bearing; 5. connecting frame; 51. lower sleeve ring; 511. upper sleeve ring; 52. annular partition; 53. vertical baffle; 54. through hole; 6. upper sealing shell; 61. annular window; 62. annular scale; 63. annular groove; 631. rotating ring; 64. positioning groove; 65. circular window; 66. arc scale; 67. sealing gasket; 7. reflecting plate; 8. laser transmitter; 81. mounting frame; 82. positioning protrusion; 83. positioning ball; 84. thrust spring; 9. bushing. DETAILED DESCRIPTION

[0020] The preferred embodiments of the present invention are described below in conjunction with 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.

[0021] Example 1, reference Figures 1 to 13The present invention provides a rheological measurement device for drilling fluid contaminated by acidic gas under ultra-high temperature and pressure conditions, comprising: a lower sealed shell 1 and an upper sealed shell 6, the inner cavity of the lower sealed shell 1 is filled with drilling fluid, a bottom frame 13 is fixed to the bottom of the lower sealed shell 1, and a fluid exchange pipe 14 is connected to the bottom of the lower sealed shell 1, and the drilling fluid is injected into the inner cavity of the lower sealed shell 1 or discharged through the fluid exchange 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 sealed shell 1 through the fluid exchange pipe 14, and a rotating outer cylinder 2 is rotatably installed in the inner cavity of the lower sealed shell 1, and a rotating inner cylinder 2 is rotatably installed in the inner cavity of the rotating outer cylinder 2. 3. When the rotating outer cylinder 2 rotates, the viscosity of the drilling fluid can drive the rotating inner cylinder 3 to deflect. 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 arranged on the outer side of the lower sealing shell 1, which is used to cool down or heat up the drilling fluid in the inner cavity of the lower sealing shell 1, and measure and calculate the rheological properties of the drilling fluid under different temperature conditions. A suspension shaft 4 is fixedly arranged on the upper end of the rotating inner cylinder 3, and a vertically placed reflective plate 7 is fixedly installed on the upper end of the suspension shaft 4. The direction of the reflective plate 7 deflects with the deflection of the rotating inner cylinder 3; Furthermore, the upper sealing shell 6 is installed at the upper end opening of the lower sealing shell 1, and a sealing gasket 67 is arranged between the two. The upper sealing shell 6 is used to seal the upper end opening of the lower sealing shell 1 to ensure that the inner cavity of the lower sealing shell 1 is a sealed structure. The outer wall of the upper sealing shell 6 is provided with an annular window 61 at the same level as the reflector 7, and an annular scale 62 is provided on the surface of the annular window 61. A laser emitter 8 is rotatably installed on the outer side of the upper sealing shell 6. The laser emitter 8 is facing the reflector 7. The laser emitter 8 emits laser rays to irradiate the reflector 7. The surface of the reflector 7 is reflected by the reflector plate 7, and the reflected light is irradiated to the annular 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. In addition, the reflector plate 7 reflects the laser beam, and the deflection angle of the reflector plate 7 can be magnified twice, so as to reduce the relative error generated during measurement. Compared with the traditional measuring equipment using the magnetic angle sensor to measure the deflection angle, the present invention can avoid the interference of the magnetic field and improve the measurement accuracy under the premise of non-contact measurement. In addition, a small gear 43 fixed to the suspension shaft 4 is provided above the reflector 7, a large gear 44 is provided on the outer side of the small gear 43, and the large gear 44 is rotatably mounted on the upper inner wall of the upper sealing shell 6, and a circular window 65 corresponding to the large gear 44 is provided on the upper end surface of the upper sealing shell 6, and an arc-shaped scale 66 is provided on the circular 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, even exceeding one 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, which means that the angle data measured by the annular scale 62 at this time needs to be increased by 360 degrees. By analogy, the present invention can measure the angle of the reflector 7 after several circles of deflection, thereby 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; In addition, a booster head 12 is fixed at the bottom of the lower sealing shell 1, and the lower end of the booster head 12 is connected to an air inlet pipe 122. A one-way valve 121 is provided in the inner cavity of the 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 into strata containing carbon dioxide gas is increasing, and the drilling fluid is contaminated by carbon dioxide gas from time to time. After carbon dioxide gas enters the drilling fluid, H2CO3, HCO3 - and CO3 2- There are three forms in drilling fluid. When HCO3 - and CO3 2- As the concentration of carbon dioxide increases, 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 sealed shell 1 through the air inlet pipe 122. At the same time, since the inner cavity of the lower sealed shell 1 is sealed, the pressure in the inner cavity will increase after the carbon dioxide gas is introduced, so that the pressure of the drilling fluid can be simulated and adjusted. By controlling the variables, the present invention can measure the rheological properties of the drilling fluid under different temperatures, different pressures and conditions of carbon dioxide pollution of different concentrations. A plurality of aeration holes 123 distributed in an annular 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. The inner diameter of the aeration holes 123 is small, which can facilitate the rapid pollution of the drilling fluid by carbon dioxide gas. The present invention takes oil-based drilling fluid as an example, combined with Fig.13 As shown in the figure, the rheological curves of oil-based drilling fluids under constant pressure of 180MPa 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 value, the increasing trend of the shear pressure will slow down; secondly, when the temperature is 30℃, the shear rate is between 200-350s -1 In the range, the shear stress of drilling fluid will tend to decrease; When the present invention is in use, the temperature and pressure can be adjusted according to actual needs, and it can simulate a high-pressure environment of more than 200MPa and a high-temperature environment of more than 250°C. The water-based and oil-based drilling fluids can be tested separately under high-temperature and high-pressure environments, which can better fit the actual environment of underground drilling and ensure that the measurement results are authentic and valid.

[0022] In order to adjust the position of the laser emitter 8, the annular window 61 and the circular window 65 of the present invention are both made of tempered glass, which has higher strength and can withstand a greater pressure in the inner cavity of the lower sealed shell 1. An annular groove 63 opened on the outer wall of the upper sealed shell 6 is provided on both the upper and lower sides of the annular window 61. A rotating ring 631 is rotatably installed in the inner cavity of the annular groove 63. A mounting frame 81 is fixedly installed on the outer side of the laser emitter 8, and the two ends of the mounting frame 81 are respectively fixedly connected to the two rotating rings 631. Figure 8 and Fig. 9 As shown, the staff can drive the laser emitter 8 to rotate around the upper sealing shell 6 by pushing the mounting frame 81, thereby changing the position of the laser emitter 8 and the incident angle of the laser emitted by the laser emitter 8, and while the laser emitter 8 changes its position, the laser it emits always irradiates the center position of the reflector 7.

[0023] In order to prevent the position of the laser emitter 8 from being easily shifted, the present invention further has a plurality of positioning grooves 64 distributed in a ring array on the outer side wall of the upper sealing shell 6, 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, such as Fig. 9 As shown, the thrust spring 84 can be accommodated in the inner cavity of the positioning protrusion 82 and compress the thrust spring 84, so the thrust generated by the thrust spring 84 on the positioning ball 83 can clamp the positioning ball 83 into the inner cavity of the positioning groove 64. Therefore, after the present invention pushes the mounting frame 81 to change the position of the laser emitter 8, 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 easily shifting its position.

[0024] In order to install the reflector 7, the present invention further has a convex plate 42 fixedly arranged on the upper end of the suspension shaft 4. The cross section of the convex plate 42 is semicircular. The reflector 7 is fixedly connected to the convex plate 42 by screws. Figure 5As shown, after the reflector 7 and the convex plate 42 are fixedly installed, the symmetry line of the reflector 7 coincides with the axis of the suspension shaft 4. Therefore, during the deflection of the reflector 7, the laser emitted by the laser emitter 8 always irradiates the specified position on the surface of the reflector 7, that is, the position of the incident light remains unchanged, and only the reflected light changes with the deflection of the reflector 7. The pinion 43 is horizontally fixed on the top of the convex plate 42 by bolts and will not collide with the reflector 7. The pinion 43 remains 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 keep in mesh 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 without position shifting.

[0025] In order 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 composed of a lower ring 51 and an upper ring 511 fixedly connected, and the annular cover is rotatably sleeved on the outer side of the annular boss 41 through a bearing 46, and a torsion spring 45 is fixedly installed between the two. Figure 5 , Figure 6 and Figure 7 As shown in FIG. 1 , since the position of the connecting frame 5 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, and the compression degree 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, and θ is the deformation angle of the torsion spring (that is, the present In the present invention, the deflection angle of the reflective plate 7 and the suspension shaft 4), k is the elastic coefficient of the torsion spring, thereby the torque generated by the drilling fluid on the side wall of the rotating inner cylinder 3 due to its 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 setting of the shaft sleeve 9 is used to shield the surface of the suspension shaft 4 to prevent the viscosity of the drilling fluid from acting on the surface of the suspension shaft 4. Therefore, the present invention only needs to calculate the effect between the drilling fluid and the surface of the rotating inner cylinder 3.

[0026] In order to prevent the excess drilling fluid from rotating, the present invention also has a plurality of annular partitions 52 distributed vertically at equal intervals and a plurality of vertical baffles 53 distributed in an annular array fixedly installed between the outer wall of the annular cover and the inner wall of the upper sealing shell 6. The annular partitions 52 and the vertical baffles 53 are perpendicularly intersected with each other, and a through hole 54 is opened through the surface of the annular partition 52. The annular partition 52 is used to prevent the drilling fluid from splashing when it rotates and flows, and the vertical baffle 53 is used 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 can rotate in the present invention.

[0027] In order to drive the rotating outer cylinder 2 to rotate, the present invention also has a driving ring 11 rotatably installed on the outer side of the lower sealing shell 1, and the inner wall of the driving ring 11 and the outer wall of the rotating outer cylinder 2 are respectively fixedly installed with magnet 1 112 and magnet 2 21, and the two attract each other. When the driving ring 11 rotates, it drives the rotating outer cylinder 2 to rotate in a contactless manner. The outer wall of the driving ring 11 is provided with an annular tooth 111, and 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 maintains meshing transmission with the annular tooth 111. Rolling bodies 113 are movably embedded on the upper and lower side surfaces of the driving ring 11, and the outer wall of the lower sealing shell 1 is fixedly provided with retaining rings located on the upper and lower sides of the driving ring 11 respectively. The retaining ring is set to position the driving ring 11 to ensure that the driving ring 11 can only rotate without separating from the lower sealing shell 1. The setting of the rolling body 113 can reduce the friction generated between the driving ring 11 and the lower sealing shell 1 when it rotates.

[0028] In order to make the carbon dioxide gas quickly and evenly contaminate the drilling fluid, the present invention also has a bottom plate 22 fixedly arranged at the bottom of the rotating outer cylinder 2, a bottom cylinder 23 fixed to the lower surface of the bottom plate 22, and a circulation slot 231 is opened on the surface of the bottom cylinder 23, and a plurality of through grooves 221 distributed in an annular array are opened on the surface of the bottom plate 22, and a movable baffle 222 sealing the inner cavity of the through groove 221 is rotatably installed, and the movable baffle 222 is inclined at 30 degrees, such as Fig.10 and Fig.11As shown, when the rotating outer cylinder 2 rotates forward, the movable baffle 222 is squeezed by the drilling fluid on the lower side and will be folded and stored in the inner cavity of the through groove 221. At this time, the lower end of the rotating outer cylinder 2 is sealed, and the rotating inner cylinder 3 in the inner cavity of the rotating outer 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 rotating outer cylinder 2 of the present invention is rotated in the opposite direction. At this time, the movable baffle 222 is rotated downward and unfolded by thirty degrees, so that the drilling fluid can be driven to gradually flow upward in the inner cavity of the rotating outer cylinder 2 during the rotation of the bottom plate 22. At this time, the drilling fluid rotates and circulates up and down at the same time, thereby ensuring that the carbon dioxide gas can mix and contaminate the drilling fluid evenly and quickly, so as to quickly simulate the actual exploration environment.

[0029] 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 the piston rod 224, and a receiving chamber 223 for the piston rod 224 to be movably inserted is provided on the inner wall of one side of the through groove 221, and a damping hole 226 is provided on the inner wall of the receiving chamber 223, and the 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. Fig.11 As shown, during the rotation and expansion process, the movable baffle 222 can drive the piston rod 224 to slide in the inner cavity of the storage chamber 223 through the connecting action of the linkage rod 225. Since the drilling fluid can enter the inner cavity of the storage chamber 223 through the damping hole 226, and the inner diameter of the damping hole 226 is relatively small, the viscosity of the drilling fluid itself combined with 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, ensuring that the position of the movable baffle 222 after expansion is stable and will not shake easily. In addition, the cooperation between the piston rod 224 and the linkage rod 225 can also limit the rotation and expansion angle of the movable baffle 222 to prevent its expansion angle from being too large.

[0030] In order to rotatably install the rotating outer cylinder 2, the present invention also has a rotating shaft 24 fixed at the center of the lower surface of the base plate 22, and the rotating shaft 24 is rotatably installed on the upper end of the booster head 12. The cooperation between the rotating shaft 24 and the booster head 12 is mainly used for rotatably installing the rotating outer cylinder 2 as a whole.

[0031] The above are only some preferred embodiments of the present invention. Any person skilled in the art may modify the above 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 shall fall within the scope of protection claimed 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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