Drilling fluid lubrication performance testing device

Abstract

The invention provides a drilling fluid lubrication performance testing device, and belongs to the field of petroleum engineering, the drilling fluid lubrication performance testing device comprises a testing kettle, the testing kettle comprises a kettle body and a kettle cover; the rotating friction mechanism is arranged on the testing kettle and comprises a metal friction column capable of rotating; the slide block clamping device is arranged in the test kettle, a rock slide block is mounted on the slide block clamping device, and the rock slide block is in contact with the metal friction column and can apply a certain pressure on the metal friction column; wherein the testing kettle is filled with drilling fluid, and the metal friction column rotates to generate friction with the rock sliding block. The invention solves the limitation problems that the friction resistance coefficient of the drilling fluid can only be measured at room temperature and normal pressure in the existing drilling fluid lubrication performance evaluation, and an evaluation instrument capable of simulating high-temperature and high-pressure conditions is tedious in operation, complex in sample configuration and the like.

Description

Technical Field

[0001] The invention relates to a drilling fluid lubrication performance testing device and belongs to the field of petroleum engineering. Background Art

[0002] Accurate and effective evaluation of the lubricity of drilling fluids is one of the key factors in lubricant development and characterization of the lubricity of drilling fluids. The existing methods for evaluating the lubricity of drilling fluids mainly include extreme pressure lubricity meters, LEM series lubricity meters, mud cake viscosity coefficient meters, mud cake adhesion coefficient meters, etc.

[0003] Among them, the extreme pressure lubricity meter is the most commonly used instrument for evaluating the lubricity of drilling fluid abroad. The extreme pressure lubricity meter is a special lubricity analyzer that measures the lubricity performance of drilling fluid by simulating the rotation speed of the drill bit and the borehole pressure that the drill bit is subjected to. It is currently an analytical instrument with high reliability in evaluating the lubricity of drilling fluid and has been identified as a laboratory standard determination method by the API Petroleum Institute. However, the use of the extreme pressure lubricity meter to test the lubricity of drilling fluid measures the friction coefficient of relative motion between metals in the drilling fluid environment, and cannot truly simulate the friction between the drill bit and the rock surface of the well wall during the drilling process. In addition, the extreme pressure lubricity meter can only measure the friction coefficient of drilling fluid at room temperature and pressure, so it cannot simulate the friction in the underground high temperature and high pressure environment and the drilling fluid circulation state.

[0004] The LEM series lubrication tester was first designed by MI Mud Company in the United States. It is a special instrument for evaluating the lubricity of de-stuck agents, lubricants and drilling fluids under simulated drilling dynamic conditions. This instrument simulates the mutual friction relationship between downhole drill tools and rocks well, but the test results of this instrument cannot be compared with those of existing lubricity testing instruments. The instrument is complex to operate, the use steps are cumbersome, the test takes a long time, the volume is large and the weight is heavy, and a large amount of drilling fluid samples are required, and the operation is very cumbersome.

[0005] The mud cake viscosity coefficient tester is improved on the basis of the slide plate lubrication tester. The data obtained by this instrument is the lubricity of the mud cake, but the surface state of the mud cake is greatly affected by temperature, humidity, and the time it is placed in the air. Therefore, the repeatability and regularity of the measured data are poor. In addition, the manual operation has a large error in accurately grasping the rotation balance point, and the test conditions are not parallel, resulting in unsatisfactory test results. The mud cake adhesion coefficient tester simulates the experimental conditions of differential pressure drilling. By measuring the ratio of the force of the pressure plate rotating on the mud cake to the force of the pressure plate pressing on the object, the instrument can reflect the anti-stuck ability of the drilling fluid to a certain extent. However, in the process of pressing the adhesion plate and the mud cake, it is easy to squeeze the bubbles in the drilling fluid between the two. And due to the operator's own error, it cannot be guaranteed that the formed mud cake is completely uniform, resulting in poor data repeatability. The instrument can only measure the lubricity of the mud cake surface, but not the lubricity of the drilling fluid. Summary of the invention

[0006] In view of the above-mentioned technical problems existing in the prior art, the present invention proposes a drilling fluid lubrication performance testing device to solve the problems that the existing drilling fluid lubrication performance evaluation can only measure the friction coefficient of the drilling fluid at room temperature and normal pressure, and the evaluation instruments that can simulate high temperature and high pressure conditions have limitations such as cumbersome operation and complex sample configuration.

[0007] The present invention provides a drilling fluid lubrication performance testing device, comprising:

[0008] A test kettle, the test kettle comprising a kettle body and a kettle cover;

[0009] a rotational friction mechanism disposed on the test kettle, the rotational friction mechanism comprising a rotatable metal friction column; and

[0010] A slider clamping device is arranged inside the test kettle, and a rock slider is installed on the slider clamping device, and the rock slider contacts the metal friction column and can exert a certain pressure on the metal friction column;

[0011] The test kettle is filled with drilling fluid, and the metal friction column rotates to rub against the rock slider.

[0012] A further improvement of the present invention is that a detection system is provided on the test kettle, and the detection system detects data when the metal friction column and the rock slider are rubbed;

[0013] The test kettle is also connected to a control system, which is connected to the detection system and calculates the lubrication performance of the drilling fluid according to the detection system.

[0014] A further improvement of the present invention is that a pressurizing system is provided on the test kettle, and the pressurizing system includes a first pressurizing mechanism for pressurizing the interior of the test kettle, and a second pressurizing mechanism for pressurizing the slider clamping device;

[0015] The pressurizing system is connected to a control system, and the control system controls the pressure in the test kettle through the first pressurizing mechanism, and the control system controls the pressure between the rock slider and the metal friction column through the second pressurizing mechanism.

[0016] A further improvement of the present invention is that a heating device is provided on the test kettle, the heating device is connected to the control system, and the control system controls the temperature in the test kettle through the heating device.

[0017] A further improvement of the present invention is that the rotational friction mechanism includes a motor arranged outside the test kettle, the rotating shaft of the motor is connected to the metal friction column, and the end of the metal friction column is arranged inside the test kettle through a rotation connection port on the test kettle.

[0018] A further improvement of the present invention is that a plurality of bearings and a rotating sealing mechanism are provided on the rotating connection port.

[0019] A further improvement of the present invention is that the detection system includes a torque sensor arranged on the rotating friction mechanism, a first pressure indicator arranged on the first pressurizing mechanism, a second pressure indicator arranged on the second pressurizing mechanism, and a temperature sensor arranged in the test kettle.

[0020] A further improvement of the present invention is that the first pressurizing mechanism comprises a first gas source, the first gas source is connected to the test kettle via a first pipeline, and a first pressure indicator and a first regulating valve are arranged on the first pipeline;

[0021] In addition, a line pressure indicator and a first air release valve are also provided on the first pipeline.

[0022] A further improvement of the present invention is that a reversing valve is arranged on the first pipeline, and a branch pipeline is connected to the reversing valve; and a precise regulating valve and a precise display indicator are arranged on the branch pipeline.

[0023] A further improvement of the present invention is that the second pressurizing mechanism includes a second gas source, the second gas source is connected to the slider clamping device through a second pipeline, and the second pipeline is provided with a second pressure indicator, a second regulating valve and a second air release valve.

[0024] A further improvement of the present invention is that the control system further includes a host, the host is provided with a host casing, and a control panel is provided on the host casing.

[0025] A further improvement of the present invention is that a drain valve is provided at the lower part of the test kettle.

[0026] Compared with the prior art, the advantages of the present invention are:

[0027] The drilling fluid lubricity testing device of the present invention solves the limitation problems that the existing drilling fluid lubricity evaluation can only measure the friction coefficient of the drilling fluid at room temperature and pressure, and the evaluation instrument that can simulate high temperature and high pressure conditions is cumbersome to operate and the sample configuration is complex.

[0028] The drilling fluid lubrication performance test device of the present invention is a set of high temperature and high pressure lubrication evaluation equipment with a temperature resistance of 180°C and a pressure resistance of 7MPa, which can test the extreme pressure lubrication coefficient between metal and rock. It is simple to operate, takes a short time to test, and is convenient for sample configuration. It can break through the limitations of the existing technology and can test the lubrication coefficient between metal and rock under high temperature and high pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, in which:

[0030] Figure 1 It is a schematic diagram of a drilling fluid lubricity testing device according to one embodiment of the present invention;

[0031] Figure 2 Shown is a schematic diagram of a first pressurizing mechanism according to an embodiment of the present invention;

[0032] Figure 3 Shown is a schematic diagram of a control panel according to an embodiment of the present invention;

[0033] Figure 4 It is a schematic diagram showing the effect of temperature on the friction between shale and metal as tested by a drilling fluid lubricity testing device according to an embodiment of the present invention.

[0034] The drawings are not drawn to scale.

[0035] The meanings of the reference numerals in the accompanying drawings are as follows:

[0036] 1. Test kettle, 2. Rotating friction mechanism, 3. Slider clamping device, 4. First pressurizing mechanism, 5. Second pressurizing mechanism, 6. Control panel, 11. Kettle body, 12. Kettle cover, 13. Drain valve, 14. Rotating connection port, 15. Bearing, 21. Motor, 22. Metal friction column, 23. Torque sensor, 31. Rock slider, 40. First gas source, 41. First pipeline, 42. First pressure indicator, 43. First air release valve, 44. First regulating valve, 45. Line pressure indicator, 46. 6. Reversing valve, 47. Branch pipeline, 48. Precision regulating valve, 49. Precision display indicator, 51. Second gas source, 52. Second pipeline, 53. Second pressure indicator, 54. Second regulating valve, 55. Second air release valve, 61. Main power switch, 62. Pressure regulating valve in kettle, 63. Test slide pressure regulating valve, 64. Pressure relief valve in kettle, 65. Test slide pressure relief valve, 66. Heating jacket temperature control, 67. Test kettle temperature control, 68. Heating switch, 69. Data display table. DETAILED DESCRIPTION

[0037] In order to make the technical solutions and advantages of the present invention more clearly understood, the exemplary embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than an exhaustive list of all the embodiments. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0038] A drilling fluid lubricity testing device according to the present invention solves the limitation problems that the existing drilling fluid lubricity evaluation can only measure the friction coefficient of the drilling fluid at room temperature and normal pressure, and the evaluation instrument that can simulate high temperature and high pressure conditions is cumbersome to operate and the sample configuration is complex.

[0039] Figure 1 A drilling fluid lubricity testing device according to the present invention is schematically shown, comprising:

[0040] The test kettle 1 is a high temperature and high pressure resistant test container, the interior of which can be filled with drilling fluid to provide a test space and test environment for the test experiment. The test kettle 1 includes a kettle body 11 and a kettle cover 12, the kettle cover 12 is arranged on the kettle body 11 and connected in a way that can withstand high pressure.

[0041] The test kettle 1 is provided with a rotational friction mechanism 2, which can rotate and rub against the rock slider 31. In this embodiment, the rotational friction mechanism 2 includes a metal friction column 22, which can rotate at high speed to simulate a drilling tool. In this embodiment, the metal friction column 22 is arranged inside the test kettle 1.

[0042] The slider clamping device 3 disposed inside the test kettle 1 is used to hold the rock slider 31. The rock slider 31 is a cubic structure, one side of which is provided with an arc-shaped concave surface, which matches the side surface of the metal friction column 22. The rock slider 31 is used to simulate rock formations.

[0043] When using the drilling fluid lubrication performance testing device according to the present embodiment, the testing kettle 1 is first filled with drilling fluid, and then the rotating friction mechanism 2 is started, the metal friction column 22 rotates and rubs against the rock slider 31, and the lubrication performance of the drilling fluid is detected based on the friction force or information of the friction process.

[0044] In one embodiment, a detection system is provided on the test kettle 1, and the detection system includes a number of sensors with different functions. The detection system detects data when the metal friction column 22 rubs against the rock slider 31, for example, by detecting the torque force of the metal friction column 22, the friction force between the metal friction column 22 and the rock slider 31 is calculated.

[0045] The test kettle 1 is also connected to a control system, which is connected to the detection system and calculates the lubrication performance of the drilling fluid according to the detection system.

[0046] In one embodiment, a pressurizing system is provided on the test kettle 1, and the pressurizing system includes a first pressurizing mechanism 4 for pressurizing the interior of the test kettle 1, and a second pressurizing mechanism 5 for pressurizing the slider clamping device 3. The first pressurizing mechanism 4 is preferably pneumatic pressurization, and the second pressurizing mechanism 5 can be pneumatic pressurization or hydraulic pressurization. The first pressurizing mechanism 4 is used to fill the test kettle 1 with gas to increase the air pressure in the test kettle 1, thereby simulating the high-pressure state underground. The second pressurizing mechanism 5 is used to pressurize and maintain the slider clamping device 3, and is used to adjust the pressure between the rock slider 31 and the metal friction column 22.

[0047] In this embodiment, the control system is connected to the first pressurizing mechanism 4 and the second pressurizing mechanism 5, and can control the first pressurizing mechanism 4 and the second pressurizing mechanism 5 to pressurize or depressurize. In this way, the control system can control the pressure in the test kettle 1 through the first pressurizing mechanism 4, and control the pressure between the rock slider 31 and the metal friction column 22 through the second pressurizing mechanism 5.

[0048] In the drilling fluid lubrication performance testing device according to the present embodiment, the control system can control the first pressurizing mechanism 4 and the second pressurizing mechanism 5 to pressurize or depressurize according to the experimental requirements of the test, so that the pressure in the test kettle 1 is at the pressure required by the experiment, and adjust the pressure between the rock slider 31 and the metal friction column 22, and adjust it at any time according to the changes in the test during the test.

[0049] In one embodiment, the test kettle 1 is provided with a heating device, which can heat the test kettle 1 to raise the temperature in the test kettle 1 to the temperature required by the test experiment to simulate the high temperature environment underground. The heating device is connected to the control system, and the control system controls the temperature in the test kettle 1 through the heating device.

[0050] In the drilling fluid lubricity testing device according to this embodiment, the heating device is arranged on the side wall of the kettle body 11 of the test kettle 1. Preferably, the heating device is arranged around the test kettle 1 to facilitate uniform heating. The control system controls the heating device to turn on or off according to the set test temperature, so that the temperature in the test kettle 1 is raised to the required test temperature range. If the temperature changes during the test, the control system turns on or off the heating device at any time to adjust the temperature so that it remains within the set range.

[0051] In one embodiment, the rotation friction mechanism 2 includes a motor 21 disposed outside the test kettle 1, the rotating shaft of the motor 21 is connected to a metal friction column 22, and the end of the metal friction column 22 is disposed inside the test kettle 1. The test kettle 1 is provided with a rotation connection port 14, the metal friction column 22 is mounted on the rotation connection port 14, and the front end thereof extends into the interior of the test kettle 1, and the rear end thereof is connected to the external motor 21.

[0052] In such Figure 1 In the illustrated embodiment, the rotary connection port 14 is disposed at the bottom of the test kettle 1 , and may also be disposed at the side of the test kettle 1 according to actual needs.

[0053] When using the drilling fluid lubrication performance test device according to this embodiment, the drilling fluid to be tested is filled in the test kettle 1. The motor 21 is connected to the control system and is controlled by the control system. During the test, the control system controls the start of the motor 21, thereby controlling the rotation of the metal friction column 22, and the metal friction column 22 rubs against the rock slider 31 during the rotation process.

[0054] In one embodiment, a plurality of bearings 15 and a rotating sealing mechanism are provided on the rotating connection port 14. The rotating connection port 14 is a tubular structure, and a plurality of bearings 15 are arranged in the inner hole thereof to reduce the friction between the rotating connection port 14 and the metal friction column 22. A rotating sealing structure is also provided on the rotating connection port 14, which can maintain sealing during rotation and prevent the drilling fluid from flowing out or leaking the pressure inside the test kettle 1.

[0055] Preferably, the rotary sealing structure adopts high temperature and high pressure dynamic sealing and is connected in a three-layer dynamic sealing manner. A stainless steel support is used to support the non-metallic dynamic sealing part, and a high temperature sealing ring is embedded inside to ensure the sealing and safety of the test kettle 1.

[0056] In one embodiment, the detection system includes a torque sensor 23 arranged on the rotating friction mechanism 2, a first pressure indicator 42 arranged on the first pressurizing mechanism 4, a second pressure indicator 52 arranged on the second pressurizing mechanism 5, and a temperature sensor arranged in the test kettle 1.

[0057] The torque sensor 23 can measure the torque force of the rotating friction mechanism 2. The torque force detected by the torque sensor 23 can be used to calculate the friction force between the metal friction column 22 and the rock slider 31, thereby providing data for evaluating the lubrication performance of the drilling fluid.

[0058] The first pressure indicator 42 is arranged on the first pressurizing mechanism 4, and the pressure inside the test kettle 1 can be judged through the first pressure indicator 42. When simulating the downhole high-pressure environment, the test kettle 1 is pressurized through the first pressurizing mechanism 4. During the pressurizing process, the pressure information inside the test kettle 1 can be intuitively seen through the first pressure indicator 42, so that the high-pressure environment can be accurately simulated.

[0059] The second pressure indicator 52 is disposed on the second pressurizing mechanism 5 , and the pressure applied by the second pressurizing mechanism 5 to the slider clamping device 3 can be determined through the second pressure indicator 52 , thereby controlling the pressure between the rock slider 31 and the metal friction column 22 .

[0060] The temperature sensor can detect the temperature inside the test kettle 1. When simulating a high-temperature environment underground, the control system receives data from the temperature sensor and controls the heating device to be turned off or on based on the data according to the set temperature requirements. During the test, the temperature inside the kettle may increase due to friction between the metal friction column 22 and the rock slider 31. When the temperature is high, the control system controls the heating device to be turned off, thereby adjusting the temperature inside the test kettle 1 to keep it within the set temperature range.

[0061] In one embodiment, Figure 2 As shown, the first pressurizing mechanism 4 includes a first gas source 40, and the first gas source 40 is connected to the test kettle 1 through a first pipeline 41, and the first pressure indicator 42 is arranged on the first pipeline 41. In this embodiment, a first regulating valve 44 is also arranged on the first pipeline 41, which is used to adjust the flow rate of the gas input and output on the first pipeline 41, so as to adjust the pressure inside the test kettle 1. A line pressure indicator 45 for measuring the pipeline pressure is arranged on the first pipeline 41, and the line pressure indicator 45 is arranged at the front end of the pressure regulating valve close to the gas source.

[0062] The first pipeline 41 is also provided with a first deflation valve 43 , which is arranged at a side of the front part of the line pressure indicator 45 close to the gas source. The first deflation valve 43 can deflate and relieve the pressure of the first pipeline 41 .

[0063] In a preferred embodiment, a reversing valve 46 is further provided on the first pipeline 41, and a branch pipeline 47 is connected to the reversing valve 46, and a precise regulating valve 43 and a precise display indicator 49 are provided on the branch pipeline 47. The first pipeline 41 can be switched to the branch pipeline 47 through the reversing valve 46, and the pressure inside the test kettle 1 can be precisely adjusted through the precise regulating valve 43 and the precise display indicator 49 on the branch pipeline 47.

[0064] In one embodiment, the second pressurizing mechanism 5 includes an air source, and the air source is connected to the slider clamping device 3 through a second pipeline 52. The second pipeline 52 is provided with a second pressure indicator 52 and a second regulating valve 54. In this embodiment, the second pressurizing mechanism 5 can also be hydraulic, connected through a hydraulic source and a hydraulic pipeline.

[0065] In the drilling fluid lubrication performance testing device according to this embodiment, the components and connection mode of the second pressurizing mechanism 5 can be the same as or different from those of the first pressurizing mechanism 4. The second pressurizing device is mainly used to adjust the pressure between the metal friction column 22 and the rock slider 31.

[0066] In one embodiment, the control system further includes a host, the host is provided with a host housing, and the host housing is provided with a control panel 6. The control panel 6 is provided with a pressure gauge inside the kettle and a pressure indicator gauge for the test slide, wherein the pressure gauge inside the kettle is a display gauge of the first pressure indicator 42, and the pressure indicator gauge for the test slide is a display gauge of the second pressure indicator 52.

[0067] like Figure 3 As shown, a main power switch 61 is provided on the control panel 6, which can control the on or off of the power supply for the entire device.

[0068] The control panel 6 is provided with two pressure regulating valves, namely, a pressure regulating valve 62 in the kettle for regulating the first pressurizing component and a pressure regulating valve 63 for regulating the test slider for regulating the second pressurizing component. In this embodiment, the first regulating valve 44 in the first pressurizing mechanism 4 can be directly provided on the control panel 6 to form the pressure regulating valve 62 in the kettle, or it can be indirectly connected to the pressure regulating valve 62 in the kettle by electrical connection. Similarly, the second regulating valve 54 in the second pressure regulating mechanism can be the test slider pressure regulating valve 63 directly installed on the control panel 6, or it can be indirectly connected to the test slider pressure regulating valve 63.

[0069] The control panel 6 is also provided with a pressure relief valve 64 in the kettle and a pressure relief valve for a test slider. The pressure relief valve 64 in the kettle controls the pressure relief of the first pressurizing mechanism 4, and the pressure relief valve for a test slider controls the pressure relief of the second pressurizing mechanism 5. In this embodiment, the first pressure relief valve in the first pressurizing mechanism 4 can be directly installed on the control panel 6 to form the pressure relief valve 64 in the kettle, or it can be connected to the pressure relief valve 64 in the kettle by means of electrical connection, and the first pressure relief valve can be remotely controlled to be opened or closed by the switch of the pressure relief valve 64 in the kettle. Similarly, the second pressure relief valve in the second pressurizing mechanism 5 can be directly installed on the control panel 6 to form the pressure relief valve 65 for a test slider, or it can be connected to the pressure relief valve 65 for a test slider by means of electrical connection, and the second pressure relief valve can be remotely controlled to be opened or closed by the switch of the pressure relief valve 65 for a test slider.

[0070] The control panel 6 is also provided with a heating jacket temperature control 66 and a test kettle temperature control 67, on which a set temperature can be input and the temperature of the heating device detected by the temperature sensor and the temperature of the environment in the test kettle 1 can be displayed; the heating device is automatically controlled by the set temperature. The control panel 6 is also provided with a manual heating switch 68 for manually adjusting the heating device.

[0071] The control panel 6 is provided with a data display table 69, which may be a torque data table capable of displaying the reading of the torque sensor 23 on the metal friction column 22. In another embodiment, the data display table 69 may be data showing the lubricating properties of the drilling fluid calculated based on the torque data.

[0072] In one embodiment, a drain valve 13 is provided at the lower part of the test kettle 1. The drain valve 13 is used to discharge drilling fluid.

[0073] In a specific embodiment, the lubrication performance of the drilling fluid is tested by the drilling fluid lubrication performance testing device, and the test is performed by configuring different drilling fluids and setting different temperatures and pressures.

[0074] For example, the drilling fluid is selected to be 4% bentonite slurry, and the temperatures are set to 25° C., 50° C., 100° C., and 150° C., respectively, and the pressures are set to 5 MPa and 10 MPa, respectively.

[0075] Test Example 1: Prepare 4% bentonite slurry, add it into the instrument, set the temperature to 25°C and the pressure to 5MPa, and test the lubricity coefficient of the bentonite slurry.

[0076] Test Example 2: Prepare 4% bentonite slurry, add it into the instrument, set the temperature to 50°C and the pressure to 5MPa, and test the lubricity coefficient of the bentonite slurry.

[0077] Test Example 3: Prepare 4% bentonite slurry, add it into the instrument, set the temperature to 100°C and the pressure to 5MPa, and test the lubricity coefficient of the bentonite slurry.

[0078] Test Example 4: Prepare 4% bentonite slurry, add it into the instrument, set the temperature to 150°C and the pressure to 5MPa, and test the lubricity coefficient of the bentonite slurry.

[0079] Test Example 5: Prepare 4% bentonite slurry, add it into the instrument, set the temperature to 25°C and the pressure to 10 MPa, and test the lubricity coefficient of the bentonite slurry.

[0080] Test Example 6: Prepare 4% bentonite slurry, add it into the instrument, set the temperature to 50°C and the pressure to 10 MPa, and test the lubricity coefficient of the bentonite slurry.

[0081] Test Example 7: Prepare 4% bentonite slurry, add it into the instrument, set the temperature to 100°C and the pressure to 10 MPa, and test the lubricity coefficient of the bentonite slurry.

[0082] Test Example 8: Prepare 4% bentonite slurry, add it into the instrument, set the temperature to 150°C and the pressure to 10 MPa, and test the lubricity coefficient of the bentonite slurry.

[0083] The schematic diagram of the effect of temperature on the friction between shale and metal is obtained, as shown in Figure 4 shown.

[0084] Test Example 9: Prepare 4% bentonite slurry, add it into the instrument, set the temperature to 25°C and the pressure to 5MPa, and test the lubricity coefficient of the bentonite slurry at 1min, 10min, 20min, and 30min respectively.

[0085] Test Example 10: Prepare 4% bentonite slurry, add 1% lubricant, add to the instrument, set the temperature to 100°C and the pressure to 5MPa, and test the lubricity coefficient of the bentonite slurry at 1min, 10min, 20min, and 30min respectively.

[0086] Test Example 11: Prepare 4 portions of 4% bentonite slurry, add into the instrument, set the temperature to 25°C, normal pressure, and test the lubricity coefficient of the bentonite slurry at 1min, 10min, 20min, and 30min respectively.

[0087] It can be seen from Test Examples 9 to 11 that after long-term experimental tests, the state of the shale slider is stable; the lubrication coefficient does not change significantly with the extension of the experimental time.

[0088] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and / or modifications that fall within the scope of the present invention, and changes and / or modifications made according to the embodiments of the present invention should be included within the scope of protection of the present invention.

Claims

1. A drilling fluid lubrication performance testing device, characterized in that: include: A test kettle (1), the test kettle (1) comprising a kettle body (11) and a kettle cover (12); A rotational friction mechanism (2) disposed on the test kettle (1), the rotational friction mechanism (2) comprising a rotatable metal friction column (22); and a slider clamping device (3) disposed inside the test kettle (1), a rock slider (31) being mounted on the slider clamping device (3), the rock slider (31) being in contact with the metal friction column (22) and being capable of exerting a certain pressure on the metal friction column (22); The test kettle (1) is filled with drilling fluid, and the metal friction column (22) rotates to generate friction with the rock slider (31).

2. The drilling fluid lubrication performance testing device according to claim 1, characterized in that: The test kettle (1) is provided with a detection system, and the detection system detects data when the metal friction column (22) and the rock slider (31) rub against each other; The test kettle (1) is also connected to a control system, which is connected to the detection system and calculates the lubrication performance of the drilling fluid based on the detection system.

3. The drilling fluid lubrication performance testing device according to claim 2, characterized in that: The test kettle (1) is provided with a pressurizing system, the pressurizing system comprising a first pressurizing mechanism (4) for pressurizing the interior of the test kettle (1), and a second pressurizing mechanism (5) for pressurizing the slider clamping device (3); The pressurizing system is connected to a control system, and the control system controls the pressure in the test kettle (1) through the first pressurizing mechanism (4), and the control system controls the pressure between the rock slider (31) and the metal friction column (22) through the second pressurizing mechanism (5).

4. The drilling fluid lubrication performance testing device according to claim 3, characterized in that: The test kettle (1) is provided with a heating device, the heating device is connected to the control system, and the control system controls the temperature in the test kettle (1) through the heating device.

5. The drilling fluid lubrication performance testing device according to claim 4, characterized in that: The rotary friction mechanism (2) comprises a motor (21) arranged outside the test kettle (1), the rotating shaft of the motor (21) is connected to the metal friction column (22), and the end of the metal friction column (22) is arranged inside the test kettle (1) through a rotary connection port (14) on the test kettle (1).

6. The drilling fluid lubrication performance testing device according to claim 5, characterized in that: The rotary connection port (14) is provided with a plurality of bearings (15) and a rotary sealing mechanism.

7. The drilling fluid lubricity testing device according to any one of claims 3 to 6, characterized in that: The detection system comprises a torque sensor (23) arranged on the rotating friction mechanism (2), a first pressure indicator (42) arranged on the first pressurizing mechanism (4), a second pressure indicator (52) arranged on the second pressurizing mechanism (5), and a temperature sensor arranged in the test kettle (1).

8. The drilling fluid lubrication performance testing device according to claim 7, characterized in that: The first pressurizing mechanism (4) comprises a first gas source (40), the first gas source (40) is connected to the test kettle (1) via a first pipeline (41), and the first pipeline (41) is provided with a first pressure indicator (42) and a first regulating valve (44); Furthermore, a line pressure indicator (45) and a first air release valve (43) are provided on the first pipeline (41).

9. The drilling fluid lubrication performance testing device according to claim 8, characterized in that: The first pipeline (41) is provided with a reversing valve (46), and the reversing valve (46) is connected to a branch pipeline (47); the branch pipeline (47) is provided with a precision regulating valve (43) and a precision display indicator (49).

10. The drilling fluid lubrication performance testing device according to claim 9, characterized in that: The second pressurizing mechanism (5) comprises a second air source (51), the second air source (51) being connected to the slider clamping device (3) via a second pipeline (52), and the second pipeline (52) being provided with a second pressure indicator (52), a second regulating valve (54) and a second air release valve (55).

11. The drilling fluid lubricity testing device according to any one of claims 7 to 10, characterized in that: The control system further comprises a host, the host is provided with a host casing, and a control panel (6) is provided on the host casing.

12. The drilling fluid lubricity testing device according to claim 11, characterized in that: A liquid discharge valve (13) is provided at the lower part of the test kettle (1).

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