A device for testing the plugging performance of a drilling fluid

Abstract

The present application belongs to the technical field of drilling fluid sealing test, especially relates to a drilling fluid sealing performance testing device, which comprises a base and further comprises a weighing feedback mechanism, a soaking and flushing mechanism, a belt conveyor, a surface drying mechanism, a drying time control mechanism, a porosity tester, a rotary feeding mechanism, a size confirmation control mechanism and a PLC controller. The present application directly measures the porosity of the core before and after the sealing of the drilling fluid to evaluate the sealing performance of the drilling fluid. By directly testing the sample core, the porosity change of the sample core before and after being saturated by the drilling fluid is evaluated to evaluate the sealing performance of the drilling fluid on the sample core, so that the test of the sealing performance of the drilling fluid is more intuitive, the actual sealing effect of the drilling fluid on the core can be better measured and observed, and the effect of the drilling fluid on the core sealing can be directly reflected.

Description

Technical Field

[0001] This invention belongs to the field of drilling fluid plugging performance testing technology, and in particular relates to a drilling fluid plugging performance testing device. Background Technology

[0002] The sealing performance of drilling fluid refers to its ability to effectively seal formation pores, fractures, and other channels during the drilling process, preventing drilling fluid loss and formation fluid intrusion into the wellbore. Good sealing performance can reduce drilling fluid loss to the formation, ensure stable well pressure, avoid complex situations such as well collapse and well kick caused by leakage, and ensure drilling safety.

[0003] Existing methods for evaluating drilling fluid plugging performance mostly employ indirect means such as measuring drilling fluid API filtration loss and using PPA-type drilling fluid plugging performance evaluation instruments. These methods indirectly infer the plugging performance of drilling fluid by measuring the water loss of the drilling fluid through the use of filter media with different specifications of pore size. This approach lacks intuitiveness and cannot measure or observe the actual plugging effect of drilling fluid on rock cores. Summary of the Invention

[0004] The purpose of this invention is to address the above-mentioned problems by providing a drilling fluid plugging performance testing device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a drilling fluid plugging performance testing device, comprising a base, and further comprising: The weighing feedback mechanism is fixedly installed at the upper end of the base; The soaking and rinsing mechanism is fixedly installed at the upper end of the base; The belt conveyor is fixedly installed on the upper end of the base; A surface drying mechanism is fixedly installed on the upper end of the base and located on one side of the belt conveyor; The drying time control mechanism is fixedly installed at the lower end of the belt conveyor; A porosity tester is fixedly installed on the upper end of the base; A rotary feeding mechanism is fixedly installed on the upper end of the base and positioned between the weighing feedback mechanism and the belt conveyor. The size confirmation and adjustment mechanism is fixedly installed on the rotary feeding mechanism and electrically connected to the drying time control mechanism. The PLC controller is fixedly installed on the upper part of the base.

[0006] In the aforementioned drilling fluid plugging performance testing device, the weighing feedback mechanism includes multiple symmetrically fixed support slide rods mounted on the upper end of the base. A common weighing plate is slidably sleeved around each of the support slide rods. Multiple weighing springs, sleeved around the support slide rods, are fixedly mounted on the upper end of the base and the lower end of the weighing plate. A transmission rack is fixedly mounted on one side of the weighing plate. A speed-increasing gearbox is fixedly mounted on the upper end of the base. A transmission gear meshing with the transmission rack is fixedly connected to the input end of the speed-increasing gearbox. Two electric push rods are also symmetrically fixedly connected to the upper end of the base. The upper moving end of the rod is fixedly connected to the same feedback housing. A transmission screw is rotatably connected to the upper inner wall of the feedback housing. A driving gear is fixedly connected to the output end of the speed-increasing gearbox. A driven gear that meshes with the driving gear is fixedly connected to one end of the transmission screw. A transmission seat is threadedly sleeved on the rod wall of the transmission screw. A position switch is fixedly installed on the side wall of the transmission seat. A rotating screw parallel to the transmission screw is rotatably connected to the lower inner wall of the feedback housing. A drive motor for driving the rotating screw to rotate is fixedly installed on the outer wall of the feedback housing. A pressing plate is threadedly sleeved on the rod wall of the rotating screw.

[0007] In the aforementioned drilling fluid plugging performance testing device, the immersion flushing mechanism includes an immersion cylinder. A support frame is fixedly installed at the bottom of the inner wall of the immersion cylinder. A discharge pipe is fixedly connected to the lower end of the immersion cylinder wall. An on / off valve is installed on the discharge pipe. A vertically arranged electric slide rail is fixedly installed on the outer wall of the immersion cylinder. One end of the slider inside the electric slide rail is fixedly connected to an installation plate. A U-shaped push-pull tube is fixedly installed on the installation plate. One end of the push-pull tube extends into the immersion cylinder and is fixedly connected to an annular flushing tube. Multiple flushing heads are fixedly connected at equal intervals on the inner side of the annular flushing tube. A water supply pipe is fixedly connected to the end of the push-pull tube outside the immersion cylinder. A water supply pump is installed on the water supply pipe and is fixedly installed outside the installation plate.

[0008] In the aforementioned drilling fluid plugging performance testing device, the surface drying mechanism includes a drying frame fixedly installed on the upper end of the base, an electric roller fixedly installed on the bottom of the inner wall of the drying frame, a plurality of drying heads fixedly inserted into the upper end of the drying frame, the upper ends of the plurality of drying heads being fixedly connected to the same drying pipe, a blower hot air fan fixedly installed on the upper end of the drying frame, the air outlet of the blower hot air fan being fixedly connected to the upper end of the drying pipe through an air supply pipe, and a drain pipe fixedly connected to the lower end of the drying frame.

[0009] In the aforementioned drilling fluid plugging performance testing device, the drying time control mechanism includes a control housing fixedly installed at the lower end of a belt conveyor. An intermediate shaft is rotatably connected to the center of the inner wall of the control housing. A reduction motor for driving the intermediate shaft to rotate is fixedly installed on the outer wall of the control housing. A trigger switch is fixedly installed on one side of the inner wall of the control housing. An arc-shaped trigger block corresponding to the position of the trigger switch is fixedly connected to the shaft wall of the intermediate shaft. An alarm is fixedly installed at the lower end of the control housing.

[0010] In the aforementioned drilling fluid plugging performance testing device, the rotary feeding mechanism includes an electric telescopic rod fixedly installed on the upper end of the base. A U-shaped fixed plate is fixedly connected to the upper moving end of the electric telescopic rod. A deflection frame is rotatably connected inside the U-shaped fixed plate. A deflection motor for driving the deflection frame to rotate is fixedly installed on the outer wall of the U-shaped fixed plate. A hollow clamping cylinder is fixedly connected to the end of the deflection frame away from the U-shaped fixed plate. An elastic airbag is fixedly installed on the inner side of the hollow clamping cylinder. A plurality of air holes communicating with the elastic airbag are also opened on the inner wall of the hollow clamping cylinder. A pressure pipe is fixedly installed on the outer wall of the hollow clamping cylinder. A pressure pump is installed on the pressure pipe. The pressure pump is fixedly installed outside the deflection frame. A pressure switch is fixedly installed on the outer wall of the weighing plate. A tamping rod corresponding to the position of the pressure switch is fixedly installed on the side wall of the deflection frame.

[0011] In the aforementioned drilling fluid plugging performance testing device, the size confirmation and control mechanism includes a control shell fixedly installed on the outer wall of the deflection frame. An adjusting screw is rotatably connected inside the control shell. An adjusting motor for driving the adjusting screw to rotate is fixedly installed on the outer wall of the control shell. An adjusting seat is threaded onto the rod wall of the adjusting screw. An adjusting resistance rod parallel to the adjusting screw is also fixedly installed on the inner wall of the control shell. An adjusting conductive contact piece that is electrically in contact with the adjusting resistance rod is fixedly installed at one end of the adjusting seat.

[0012] In the above-mentioned drilling fluid plugging performance testing device, the ends of the transmission seat and the pressing plate are fixedly equipped with limiting sliders, and the inner wall of the feedback shell is provided with a limiting groove that matches and slides with the limiting slider.

[0013] In the aforementioned drilling fluid plugging performance testing device, the bottom of the inner wall of the drying frame is designed as an inverted cone shape, and the lowest point is connected to the upper end of the drain pipe.

[0014] In the aforementioned drilling fluid plugging performance testing device, a pressure relief cylinder is fixedly connected to the outer wall of the hollow clamping cylinder. A pressure relief piston is sealed inside the pressure relief cylinder. Multiple push rods are fixedly connected to the rear side of the pressure relief piston. The ends of the multiple push rods away from the pressure relief piston extend through the pressure relief cylinder and are fixedly connected to the same push plate. Multiple pressure springs sleeved on the push rods are fixedly installed on the opposite side of the pressure relief piston and the pressure relief cylinder. A confirmation switch is fixedly installed on the outer wall of the pressure relief cylinder, which is opposite to the push plate.

[0015] Compared with existing technologies, the advantages of this invention are as follows: 1. By using a porosity tester, soaking and rinsing mechanism, surface drying mechanism, and belt conveyor, the porosity of the rock core is directly measured before and after drilling fluid plugging to evaluate the plugging performance of the drilling fluid. By directly testing the sample rock core, the change in porosity (the ratio of the sum of the volumes of all pore spaces in the sample rock core to the volume of the rock sample) before and after the sample rock core is saturated with drilling fluid is evaluated to assess the plugging performance of the drilling fluid. This makes the testing of the drilling fluid plugging performance more intuitive, and can better realize the measurement and observation of the actual plugging effect of the drilling fluid on the rock core, directly reflecting the effect of the drilling fluid on the rock core plugging.

[0016] 2. Through the established weighing feedback mechanism and soaking and rinsing mechanism, the sample rock core can be automatically soaked in drilling fluid until it is saturated. It can also quickly rinse the soaked sample rock core and automatically adjust the soaking time based on the weight of the sample rock core. The heavier the sample rock core, the shorter the soaking time. This not only ensures that the sample rock core absorbs drilling fluid to a saturated state, but also avoids the problem of excessive soaking time affecting the testing efficiency. Because with the same volume, the greater the weight of the sample rock core, the greater the proportion of solid part of the rock, and the smaller the corresponding pore volume. That is, the sample rock core can absorb less drilling fluid, so a shorter time can ensure that the sample rock core reaches a saturated state.

[0017] 3. Through the established surface drying mechanism, drying time control mechanism, rotary feeding mechanism, and size confirmation and adjustment mechanism, the sample core can be automatically fed into the drying mechanism, avoiding the problem of manual handling of the sample core causing injury to workers due to the high temperature of the drying mechanism. It can quickly dry the moisture on the outer surface of the rinsed sample core, thereby ensuring the accuracy of porosity detection after the sample core reaches saturation. Furthermore, it can automatically adjust the drying time based on the outer surface area of ​​the sample core, ensuring that the moisture on the outer surface of the sample core is completely dried, and preventing the loss of drilling fluid absorbed inside the sample core due to excessive drying time, which would affect the accuracy of drilling fluid plugging performance testing. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a cross-sectional structural schematic diagram of the weighing feedback mechanism of the present invention; Figure 3 yes Figure 2 A cross-sectional view of the feedback shell. Figure 4 This is a cross-sectional structural schematic diagram of the soaking and rinsing mechanism of the present invention; Figure 5 This is a cross-sectional structural schematic diagram of the surface drying mechanism of the present invention; Figure 6 This is a cross-sectional view of the drying time control mechanism of the present invention; Figure 7 This is a schematic diagram of the rotary feeding mechanism of the present invention; Figure 8 yes Figure 7 Schematic diagram of the cross-sectional structure of the pressure relief cylinder; Figure 9 This is a cross-sectional structural schematic diagram of the size confirmation and control mechanism of the present invention; Figure 10 This is a schematic diagram of the state of the rotary feeding mechanism of the present invention after rotation; Figure 11 yes Figure 5 A three-dimensional structural diagram of the electric idler roller; Figure 12 This is a three-dimensional structural diagram of the belt conveyor of the present invention.

[0019] In the diagram: 1. Base; 2. Weighing feedback mechanism; 21. Support slide rod; 22. Weighing plate; 23. Weighing spring; 24. Transmission rack; 25. Speed-increasing gearbox; 26. Transmission gear; 27. Electric push rod; 28. Feedback housing; 29. ​​Transmission screw; 210. Driving gear; 211. Driven gear; 212. Transmission seat; 213. Position switch; 214. Rotating screw; 215. Drive motor; 216. Pressing plate; 3. Immersion and rinsing mechanism; 31. Immersion cylinder; 32. Support frame; 33. Discharge pipe; 34. Electric slide rail; 35. Mounting plate; 36. Push-pull pipe; 37. Annular rinsing pipe; 38. Rinsing head; 39. Water supply pipe; 310. Water supply pump; 4. Surface drying mechanism; 41. Drying frame; 42. Electric roller; 43. Drying head; 44. Drying pipe; 45. Blower / hot air blower; 46. Air supply pipe. 47. Drainage pipe; 5. Drying time control mechanism; 51. Control round shell; 52. Intermediate shaft; 53. Gear motor; 54. Trigger switch; 55. Arc-shaped trigger block; 56. Alarm; 6. Rotary feeding mechanism; 61. Electric telescopic rod; 62. U-shaped fixing plate; 63. Deflection frame; 64. Deflection motor; 65. Hollow clamping cylinder; 66. Elastic airbag; 67. Pressurization pipe; 68. Pressurization pump; 69. Pressure switch; 610. Tamping rod; 611. Pressure relief cylinder; 612. Pressure relief piston; 613. Extrusion rod; 614. Extrusion plate; 615. Pressure spring; 616. Confirmation switch; 7. Size confirmation and adjustment mechanism; 71. Adjustment shell; 72. Adjustment screw; 73. Adjustment motor; 74. Adjustment seat; 75. Adjustment resistor rod; 76. Adjustment conductive contact; 8. Belt conveyor; 9. Porosity tester; 10. PLC controller. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] like Figures 1-12 As shown, a drilling fluid plugging performance testing device includes a base 1, and further includes: The weighing feedback mechanism 2 is fixedly installed on the upper end of the base 1. The weighing feedback mechanism 2 includes multiple symmetrically fixed support slide rods 21 on the upper end of the base 1. The same weighing plate 22 is slidably sleeved on the outside of the multiple support slide rods 21. Multiple weighing springs 23 sleeved on the outside of the support slide rods 21 are fixedly installed on the upper end of the base 1 and the lower end of the weighing plate 22. A transmission rack 24 is fixedly installed on one side of the weighing plate 22. A speed-increasing gearbox 25 is fixedly installed on the upper end of the base 1. A transmission gear 26 that meshes with the transmission rack 24 is fixedly connected to the input end of the speed-increasing gearbox 25. Two electric push rods 27 are also symmetrically fixedly connected to the upper end of the base 1. The upper moving ends of the two electric push rods 27 are fixedly connected to the same feedback shell 28. The upper side of the inner wall of the feedback shell 28 is rotatably connected to... The system includes a transmission screw 29, a drive gear 210 fixedly connected to the output end of a speed-increasing gearbox 25, a driven gear 211 fixedly connected to one end of the transmission screw 29 and meshing with the drive gear 210, a transmission seat 212 threadedly fitted onto the rod wall of the transmission screw 29, a position switch 213 fixedly installed on the side wall of the transmission seat 212, a rotating screw 214 rotatably connected to the lower inner wall of the feedback housing 28 and arranged parallel to the transmission screw 29, a drive motor 215 fixedly installed on the outer wall of the feedback housing 28 for driving the rotating screw 214 to rotate, a pressing plate 216 threadedly fitted onto the rod wall of the rotating screw 214, a limiting slider fixedly installed at the ends of the transmission seat 212 and the pressing plate 216, and a limiting groove opened on the inner wall of the feedback housing 28 to slide and match the limiting slider.

[0022] The soaking and rinsing mechanism 3 is fixedly installed on the upper end of the base 1. The soaking and rinsing mechanism 3 includes a soaking cylinder 31. A support frame 32 is fixedly installed on the bottom of the inner wall of the soaking cylinder 31. A discharge pipe 33 is fixedly connected to the lower end of the soaking cylinder 31. An opening and closing valve is installed on the discharge pipe 33. A vertically arranged electric slide rail 34 is fixedly installed on the outer wall of the soaking cylinder 31. One end of the slider inside the electric slide rail 34 is fixedly connected to a mounting plate 35. A U-shaped push-pull tube 36 is fixedly installed on the mounting plate 35. One end of the push-pull tube 36 extends into the soaking cylinder 31 and is fixedly connected to an annular rinsing tube 37. Multiple rinsing heads 38 are fixedly connected at equal intervals on the inner side of the annular rinsing tube 37. A water supply pipe 39 is fixedly connected to the end of the push-pull tube 36 outside the soaking cylinder 31. A water supply pump 310 is installed on the water supply pipe 39 and is fixedly installed outside the mounting plate 35.

[0023] The belt conveyor 8 is fixedly installed on the upper end of the base 1; The surface drying mechanism 4 is fixedly installed on the upper end of the base 1 and located on one side of the belt conveyor 8. The surface drying mechanism 4 includes a drying frame 41 fixedly installed on the upper end of the base 1. An electric roller 42 is fixedly installed on the bottom of the inner wall of the drying frame 41. Multiple drying heads 43 are fixedly inserted into the upper end of the drying frame 41. The upper ends of the multiple drying heads 43 are fixedly connected to the same drying pipe 44. A blower hot air fan 45 is fixedly installed on the upper end of the drying frame 41. The air outlet of the blower hot air fan 45 is fixedly connected to the upper end of the drying pipe 44 through an air supply pipe 46. A drain pipe 47 is fixedly connected to the lower end of the drying frame 41. The bottom of the inner wall of the drying frame 41 is designed as an inverted cone shape, and the lowest point is connected to the upper end of the drain pipe 47.

[0024] The drying time control mechanism 5 is fixedly installed at the lower end of the belt conveyor 8. The drying time control mechanism 5 includes a control housing 51 fixedly installed at the lower end of the belt conveyor 8. An intermediate shaft 52 is rotatably connected to the center of the inner wall of the control housing 51. A reduction motor 53 for driving the intermediate shaft 52 to rotate is fixedly installed on the outer wall of the control housing 51. A trigger switch 54 is fixedly installed on one side of the inner wall of the control housing 51. An arc-shaped trigger block 55 corresponding to the position of the trigger switch 54 is fixedly connected to the shaft wall of the intermediate shaft 52. An alarm 56 is fixedly installed at the lower end of the control housing 51.

[0025] The porosity tester 9 is fixedly installed on the upper part of the base 1; A rotary feeding mechanism 6 is fixedly installed on the upper end of the base 1 and positioned between the weighing feedback mechanism 2 and the belt conveyor 8. The rotary feeding mechanism 6 includes an electric telescopic rod 61 fixedly installed on the upper end of the base 1. A U-shaped fixing plate 62 is fixedly connected to the upper moving end of the electric telescopic rod 61. A deflection frame 63 is rotatably connected inside the U-shaped fixing plate 62. A deflection motor 64 for driving the deflection frame 63 to rotate is fixedly installed on the outer wall of the U-shaped fixing plate 62. A hollow clamping cylinder 65 is fixedly connected to the end of the deflection frame 63 away from the U-shaped fixing plate 62. An elastic airbag 66 is fixedly installed on the inner side of the hollow clamping cylinder 65. Multiple air holes communicating with the elastic airbag 66 are also opened on the inner wall of the hollow clamping cylinder 65. A pressure pipe 67 is fixedly installed on the outer wall of the hollow clamping cylinder 65, and a pressure pump 6 is installed on the pressure pipe 67. 8. A pressure pump 68 is fixedly installed outside the deflection frame 63. A pressure switch 69 is fixedly installed on the outer wall of the weighing plate 22. A tamping rod 610 corresponding to the position of the pressure switch 69 is fixedly installed on the side wall of the deflection frame 63. A pressure relief cylinder 611 is fixedly connected to the outer wall of the hollow clamping cylinder 65. A pressure relief piston 612 is sealed inside the pressure relief cylinder 611. Multiple extrusion rods 613 are fixedly connected to the rear side of the pressure relief piston 612. The ends of the multiple extrusion rods 613 away from the pressure relief piston 612 extend through the pressure relief cylinder 611 and are fixedly connected to the same extrusion plate 614. Multiple pressure springs 615 sleeved on the extrusion rods 613 are fixedly installed on the opposite side of the pressure relief piston 612 and the pressure relief cylinder 611. A confirmation switch 616 corresponding to the extrusion plate 614 is fixedly installed on the outer wall of the pressure relief cylinder 611.

[0026] The size confirmation and control mechanism 7 is fixedly installed on the rotary feeding mechanism 6 and electrically connected to the drying time control mechanism 5. The size confirmation and control mechanism 7 includes a control shell 71 fixedly installed on the outer wall of the deflection frame 63. An adjusting screw 72 is rotatably connected inside the control shell 71. An adjusting motor 73 for driving the adjusting screw 72 to rotate is fixedly installed on the outer wall of the control shell 71. An adjusting seat 74 is threadedly sleeved on the rod wall of the adjusting screw 72. A regulating resistance rod 75 is also fixedly installed on the inner wall of the control shell 71, which is parallel to the adjusting screw 72. A regulating conductive contact 76 that is electrically in contact with the regulating resistance rod 75 is fixedly installed at one end of the adjusting seat 74.

[0027] The PLC controller 10 is fixedly installed on the upper part of the base 1.

[0028] The operating principle of this invention is described as follows: The PLC controller 10 first controls the electric push rod 27 to push the feedback shell 28 upward, so that the driven gear 211 meshes with the driving gear 210. Then, the sample rock core to be tested is placed on the weighing plate 22 [the sample rock core is a cylindrical structure]. Under the action of the gravity of the sample rock core, the weighing plate 22 moves downward along the support slide rod 21 against the elastic force of the weighing spring 23. The weighing plate 22 drives the transmission rack 24 to move downward synchronously. Through the meshing action of the transmission rack 24 and the transmission gear 26, the input end of the speed-increasing gearbox 25 is driven to rotate, which in turn drives the output end of the speed-increasing gearbox 25 to drive the driving gear 210 to rotate. Through the meshing action of the driving gear 210 and the driving gear 210, the speed-increasing gear 211 and the driving gear 210 rotate. The meshing action of the driven gear 211 drives the transmission screw 29 to rotate. Through the threaded connection between the transmission screw 29 and the transmission seat 212, the transmission seat 212 drives the position switch 213 to move toward the pressing plate 216. Specifically, the greater the weight of the sample rock core, the greater the distance the weighing plate 22 moves downward, resulting in more synchronous rotations of the transmission screw 29. This, in turn, causes the transmission seat 212 to move the position switch 213 a greater distance, making the distance between the position switch 213 and the pressing plate 216 smaller. After the weighing plate 22 stabilizes, the PLC controller 10 controls the electric push rod 27 to drive the feedback shell 28 to move downward again, causing the driven gear 211 to separate from the driving gear 210. The sample rock core was sent into the porosity tester 9 to test and record the porosity of the sample rock core before immersion. The sample core is then manually placed onto the support 32 inside the soaking cylinder 31, and drilling fluid is poured into the soaking cylinder 31 until the sample core is completely immersed in the drilling fluid. During soaking, the PLC controller 10 controls the drive motor 215 to rotate, which in turn drives the rotating screw 214 to rotate. The screw 214 and the pressing plate 216 are connected by a threaded connection, causing the pressing plate 216 to move within the feedback housing 28 until the pressing plate 216 presses against the position switch 213, indicating that the soaking has started. Once the soaking process is complete, specifically, the greater the weight of a sample core of the same volume, the smaller the porosity of the sample core, the less drilling fluid it can absorb, and the easier it is to reach absorption saturation. At this time, a shorter absorption time is required to reach saturation. Simultaneously, the distance between the positioning switch 213 and the pressing plate 216 is also smaller. The pressing plate 216 can act on the positioning switch 213 with a shorter movement distance, so that the soaking process of the sample core can be completed in a shorter time after the soaking process begins. After soaking is completed, the PLC controller 10 receives a signal from the position switch 213. The PLC controller 10 controls the opening and closing valve on the discharge pipe 33 to open, so that the drilling fluid in the soaking cylinder 31 is discharged. After the drilling fluid is completely discharged, the PLC controller 10 controls the electric slide rail 34 and the water supply pump 310 to start. The water supply pump 310, together with the water supply pipe 39, draws clean cleaning water from the external water storage tank and delivers it to the annular flushing pipe 37 through the push-pull pipe 36. Then, it is flushed on the outside of the sample core by multiple flushing heads 38 in the annular flushing pipe 37 to rinse the sample core. The electric slide rail 34 drives the annular flushing pipe 37 to move up and down through the push-pull pipe 36 to thoroughly rinse the sample core. The rinsed sample core is then placed on the weighing plate 22. During this process, the sample core is placed directly inside the hollow clamping cylinder 65. The PLC controller 10 controls the electric telescopic rod 61 to move the hollow clamping cylinder 65 and the tamping rod 610 downwards until the tamping rod 610 presses against the pressure switch 69 on the side wall of the weighing plate 22. At this time, the PLC controller 10 controls the electric telescopic rod 61 to stop moving, so that the hollow clamping cylinder 65 is positioned relatively below the sample core. The PLC controller 10 then controls the pressurizing pump 68 to work. The pressurizing pump 68, together with the pressurizing pipe 67, supplies air into the hollow clamping cylinder 65, and then delivers the air to the elastic airbag 66 through multiple air holes opened inside the hollow clamping cylinder 65, thereby inflating the elastic airbag 66. The process begins until the elastic airbag 66 completely wraps around the outside of the sample core. At this point, the elastic airbag 66 can no longer expand, causing the air pressure inside the hollow clamping cylinder 65 to gradually increase until it is high enough to drive the pressure relief piston 612 to overcome the elastic force of the pressure spring 615 and slide inside the pressure relief cylinder 611. The movement of the pressure relief piston 612 drives the push rod 613 and the push plate 614 to move synchronously, causing the push plate 614 to press on the confirmation switch 616. This indicates that the clamping force of the elastic airbag 66 on the sample core is sufficient. The PLC controller 10 controls the pressurizing pump 68 to stop operating. The pressurizing pump 68 has a self-sealing structure, which prevents the air filled into the hollow clamping cylinder 65 from flowing back, thus keeping the squeezing force of the elastic airbag 66 on the sample core constant. When air is supplied to the hollow clamping cylinder 65 by the pressurizing pump 68, the PLC controller 10 controls the regulating motor 73 to operate synchronously. The regulating motor 73 drives the regulating screw 72 to rotate. Through the threaded connection between the regulating screw 72 and the regulating seat 74, the regulating seat 74 drives the regulating conductive contact 76 to slide on the regulating resistor rod 75, thereby gradually reducing the resistance value of the regulating resistor rod 75 until the confirmation switch 616 is pressed and triggered. At this time, the regulating motor 73 stops operating synchronously. Specifically, when the size of the sample rock core is larger, the gap between the elastic air bag 66 and the sample rock core is smaller, and the pressurizing pump 68 supplies less air to make the elastic air bag 66 inflate and stably clamp and fix the sample rock core. That is, the confirmation switch 616 will be pressed and triggered faster, and the working time of the regulating motor 73 is shorter, so that the sliding distance of the regulating conductive contact 76 on the regulating resistor rod 75 is shorter, and the resistance value of the regulating resistor rod 75 is relatively larger. The PLC controller 10 then controls the deflection motor 64 to drive the deflection frame 63 to rotate 90 degrees, changing the vertically positioned sample core to a horizontally positioned state. The PLC controller 10 then controls the electric telescopic rod 61 to operate until the sample core contacts the upper surface of the belt conveyor 8. At this point, the PLC controller 10 controls the belt conveyor 8 to operate and simultaneously controls the pressure pump 68 to reverse the airflow, causing the elastic airbag 66 to release its compression limit on the sample core. Driven by the belt conveyor 8, the sample core is then moved to... The electric rollers 42 inside the drying frame 41 [here, the electric rollers 42 are two rotating rollers that rotate in the same direction to realize the rotation of the sample rock core] drive the sample rock core to rotate. The PLC controller 10 controls the blower hot air fan 45 to work. The blower hot air fan 45, together with the air supply pipe 46, delivers hot air to the drying pipe 44, and acts on the outside of the sample rock core through multiple drying heads 43 to quickly dry the moisture on the outer surface of the sample rock core. Since the sample rock core is rotating, the outer surface of the sample rock core is thoroughly dried. During drying, the PLC controller 10 controls the geared motor 53 to operate. The geared motor 53 drives the intermediate shaft 52 to move the arc-shaped trigger block 55 within the control housing 51 until the arc-shaped trigger block 55 presses against the trigger switch 54, indicating that drying is complete. At this time, the PLC controller 10 controls the blower 45 and the electric roller 42 to stop operating. The control conductive contact 76 and the control resistor 75 are connected in series in the power supply circuit of the geared motor 53. The geared motor 53 is a DC motor. When the size of the sample core is larger, the resistance of the control resistor 75 is relatively large, the power supply current of the geared motor 53 is smaller, the speed of the geared motor 53 is lower, and the interval between the arc-shaped trigger block 55 acting on the trigger switch 54 is longer, automatically increasing the drying time. For large-sized sample cores, a longer drying time is used to ensure that the moisture on the outer surface of the sample core is completely dried. The sample rock core was placed in the porosity tester 9 again to test the porosity of the sample rock core after soaking. The porosity changes before and after soaking were analyzed to obtain the test results.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A drilling fluid plugging performance testing device, comprising a base (1), characterized in that, Also includes: The weighing feedback mechanism (2) is fixedly installed on the upper end of the base (1); The soaking and rinsing mechanism (3) is fixedly installed on the upper end of the base (1); The belt conveyor (8) is fixedly installed on the upper end of the base (1); The surface drying mechanism (4) is fixedly installed on the upper end of the base (1) and located on one side of the belt conveyor (8); The drying time control mechanism (5) is fixedly installed at the lower end of the belt conveyor (8); A porosity tester (9) is fixedly installed on the upper end of the base (1); A rotary feeding mechanism (6) is fixedly installed on the upper end of the base (1) and is located between the weighing feedback mechanism (2) and the belt conveyor (8); Size confirmation and control mechanism (7) is fixedly installed on the rotary feeding mechanism (6) and electrically connected to the drying time control mechanism (5); The PLC controller (10) is fixedly installed on the upper end of the base (1).

2. The drilling fluid plugging performance testing device according to claim 1, characterized in that, The weighing feedback mechanism (2) includes multiple symmetrically fixed support slide rods (21) mounted on the upper end of the base (1). The same weighing plate (22) is slidably sleeved on the outside of the multiple support slide rods (21). Multiple weighing springs (23) sleeved on the outside of the support slide rods (21) are fixedly mounted on the upper end of the base (1) and the lower end of the weighing plate (22). A transmission rack (24) is fixedly mounted on one side of the weighing plate (22). A speed-increasing gearbox (25) is fixedly mounted on the upper end of the base (1). A transmission gear (26) meshing with the transmission rack (24) is fixedly connected to the input end of the speed-increasing gearbox (25). Two electric push rods (27) are also symmetrically fixedly connected to the upper end of the base (1). The same feedback shell is fixedly connected to the upper moving end of the two electric push rods (27). 28), a transmission screw (29) is rotatably connected to the upper inner wall of the feedback shell (28), a drive gear (210) is fixedly connected to the output end of the speed-increasing gearbox (25), a driven gear (211) meshing with the drive gear (210) is fixedly connected to one end of the transmission screw (29), a transmission seat (212) is threadedly sleeved on the rod wall of the transmission screw (29), a position switch (213) is fixedly installed on the side wall of the transmission seat (212), a rotating screw (214) parallel to the transmission screw (29) is rotatably connected to the lower inner wall of the feedback shell (28), a drive motor (215) for driving the rotating screw (214) to rotate is fixedly installed on the outer wall of the feedback shell (28), and a pressing plate (216) is threadedly sleeved on the rod wall of the rotating screw (214).

3. The drilling fluid plugging performance testing device according to claim 1, characterized in that, The soaking and rinsing mechanism (3) includes a soaking cylinder (31). A support frame (32) is fixedly installed at the bottom of the inner wall of the soaking cylinder (31). A discharge pipe (33) is fixedly connected to the lower end of the soaking cylinder (31). An on / off valve is installed on the discharge pipe (33). A vertically arranged electric slide rail (34) is fixedly installed on the outer wall of the soaking cylinder (31). One end of the slider inside the electric slide rail (34) is fixedly connected to a mounting plate (35). A mounting plate (35) is fixedly installed on the mounting plate (35). A push-pull tube (36) with a U-shaped structure is provided. One end of the push-pull tube (36) extends into the soaking tube (31) and is fixedly connected to an annular rinsing tube (37). Multiple rinsing heads (38) are fixedly connected at equal intervals on the inner side of the annular rinsing tube (37). One end of the push-pull tube (36) located outside the soaking tube (31) is fixedly connected to a water supply pipe (39). A water supply pump (310) is installed on the water supply pipe (39). The water supply pump (310) is fixedly installed outside the mounting plate (35).

4. The drilling fluid plugging performance testing device according to claim 1, characterized in that, The surface drying mechanism (4) includes a drying frame (41) fixedly installed on the upper end of the base (1). An electric roller (42) is fixedly installed on the bottom of the inner wall of the drying frame (41). Multiple drying heads (43) are fixedly inserted into the upper end of the drying frame (41). The upper ends of the multiple drying heads (43) are fixedly connected to the same drying pipe (44). A blower hot air fan (45) is fixedly installed on the upper end of the drying frame (41). The air outlet of the blower hot air fan (45) is fixedly connected to the upper end of the drying pipe (44) through an air supply pipe (46). A drain pipe (47) is fixedly connected to the lower end of the drying frame (41).

5. The drilling fluid plugging performance testing device according to claim 1, characterized in that, The drying time control mechanism (5) includes a control housing (51) fixedly installed at the lower end of the belt conveyor (8). An intermediate shaft (52) is rotatably connected to the center of the inner wall of the control housing (51). A geared motor (53) for driving the intermediate shaft (52) to rotate is fixedly installed on the outer wall of the control housing (51). A trigger switch (54) is fixedly installed on one side of the inner wall of the control housing (51). An arc-shaped trigger block (55) corresponding to the position of the trigger switch (54) is fixedly connected to the shaft wall of the intermediate shaft (52). An alarm (56) is fixedly installed at the lower end of the control housing (51).

6. The drilling fluid plugging performance testing device according to claim 2, characterized in that, The rotary feeding mechanism (6) includes an electric telescopic rod (61) fixedly mounted on the upper end of the base (1). A U-shaped fixing plate (62) is fixedly connected to the upper moving end of the electric telescopic rod (61). A deflection frame (63) is rotatably connected inside the U-shaped fixing plate (62). A deflection motor (64) for driving the deflection frame (63) to rotate is fixedly mounted on the outer wall of the U-shaped fixing plate (62). A hollow clamping cylinder (65) is fixedly connected to the end of the deflection frame (63) away from the U-shaped fixing plate (62). The inner side of the hollow clamping cylinder (65) An elastic airbag (66) is fixedly installed. The inner wall of the hollow clamping cylinder (65) is also provided with a plurality of air holes communicating with the elastic airbag (66). A pressure pipe (67) is fixedly installed on the outer wall of the hollow clamping cylinder (65). A pressure pump (68) is installed on the pressure pipe (67). The pressure pump (68) is fixedly installed outside the deflection frame (63). A pressure switch (69) is fixedly installed on the outer wall of the weighing plate (22). A tamping rod (610) corresponding to the position of the pressure switch (69) is fixedly installed on the side wall of the deflection frame (63).

7. The drilling fluid plugging performance testing device according to claim 6, characterized in that, The size confirmation and control mechanism (7) includes a control housing (71) fixedly installed on the outer wall of the deflection frame (63). An adjustment screw (72) is rotatably connected inside the control housing (71). An adjustment motor (73) for driving the adjustment screw (72) to rotate is fixedly installed on the outer wall of the control housing (71). An adjustment seat (74) is threaded onto the rod wall of the adjustment screw (72). An adjustment resistor (75) is also fixedly installed on the inner wall of the control housing (71) and is arranged parallel to the adjustment screw (72). An adjustment conductive contact (76) that is electrically in contact with the adjustment resistor (75) is fixedly installed at one end of the adjustment seat (74).

8. The drilling fluid plugging performance testing device according to claim 2, characterized in that, The transmission seat (212) and the pressing plate (216) are fixedly equipped with limiting sliders at their ends, and the inner wall of the feedback shell (28) is provided with a limiting groove that matches and slides with the limiting slider.

9. The drilling fluid plugging performance testing device according to claim 4, characterized in that, The bottom of the inner wall of the drying frame (41) is set as an inverted cone structure, and the lowest point is connected to the upper end of the drain pipe (47).

10. The drilling fluid plugging performance testing device according to claim 6, characterized in that, The outer wall of the hollow clamping cylinder (65) is fixedly connected to a pressure relief cylinder (611). A pressure relief piston (612) is sealed inside the pressure relief cylinder (611). Multiple push rods (613) are fixedly connected to the rear side of the pressure relief piston (612). One end of each push rod (613) extends out of the pressure relief cylinder (611) away from the pressure relief piston (612) and is fixedly connected to the same push plate (614). Multiple pressure springs (615) sleeved on the push rods (613) are fixedly installed on the opposite side of the pressure relief piston (612) and the pressure relief cylinder (611). A confirmation switch (616) is fixedly installed on the outer wall of the pressure relief cylinder (611) opposite to the push plate (614).

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