High-temperature and high-pressure lubricator with sample adding device and lubricating performance testing method

Abstract

The invention provides a high-temperature and high-pressure lubricator with a sample adding device and a lubricating performance testing method. A high-temperature and high-pressure lubricator with a sample adding device comprises a gland, a kettle body, a transverse pressurizing cover, a sliding block, a friction cylinder, a rotating mechanism, a pressurizing mechanism, a heating device and the sample adding device, the gland is installed on the top of the kettle body, the transverse pressurizing cover is installed on one side of the kettle body, and the sliding block is installed on the other side of the kettle body. The sliding block and the friction cylinder are both located in the kettle body, the transverse pressurizing cover is connected with the sliding block, the sliding block abuts against the friction cylinder, the rotating mechanism is connected with the friction cylinder, and the sample adding device, the pressurizing mechanism and the heating device are all connected with the kettle body.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling fluid lubricity determination, in particular to a high-temperature and high-pressure lubrication instrument with a sample adding device and a lubricity performance testing method. Background Art

[0002] With the expansion of oil exploration and development offshore and into deep formations, the acceleration of shale oil and gas exploration and development, and the increasing number and length of horizontal wells, drilling operations are placing increasingly stringent demands on the lubricity of drilling fluids. High-efficiency lubricants can effectively improve the lubricity of drilling fluids and are one of the key technologies for addressing frictional issues in horizontal wells. Lubricants play a crucial role in the drilling process, reducing friction between the drill bit and the wellbore wall, improving drilling efficiency, preventing sticking, extending drill bit life, and reducing drilling fluid viscosity, thereby increasing drilling efficiency. Lubricity meters, used to evaluate the lubricity of drilling fluids, measure the torque generated by the rotational friction between a slider and a ring fully immersed in the drilling fluid, thereby reflecting the lubricity of the drilling fluid. Current lubricity meters are generally operated at room temperature and pressure, which restricts their evaluation conditions. They use a torque wrench to manually apply pressure between the slider and ring, with a mechanical pointer indicating the reading. Long-term use can cause corrosion to the slider, ring, and shaft, leading to torque wrench accuracy errors and the need for regular replacement and maintenance. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a high-temperature and high-pressure lubrication instrument with a sample adding device and a lubrication performance testing method in view of the deficiencies in the prior art.

[0004] The technical solution of the present invention to solve the above technical problems is as follows: A high-temperature and high-pressure lubrication instrument with a sample adding device includes: a pressure cover, a kettle body, a transverse pressure cover, a slider, a friction cylinder, a rotating mechanism, a pressurizing mechanism, a heating device and a sample adding device, the pressure cover is installed on the top of the kettle body, the transverse pressure cover is installed on one side of the kettle body, the slider and the friction cylinder are both located in the kettle body, the transverse pressure cover is connected to the slider, the slider abuts against the friction cylinder, the rotating mechanism is connected to the friction cylinder, and the sample adding device, the pressurizing mechanism and the heating device are all connected to the kettle body.

[0005] The beneficial effects of the technical solution of the present invention are as follows: the slider and the friction cylinder are placed in the kettle, and the friction cylinder is fixed in the kettle by a dynamic seal, so that the lubricity of the drilling fluid can be evaluated under high temperature and high pressure conditions, which can better simulate the deep well environment and provide more reliable data. In addition, lubricant can be added during the experiment to simulate the effect of adding lubricant to release the drill when the drill is stuck underground, which can achieve a more accurate and reliable lubricity evaluation of the drilling fluid. The friction cylinder rotates under the drive of the rotating mechanism, and the slider approaches the friction cylinder under the push of the lateral pressure cover, and the friction cylinder and the slider will rub against each other. The friction cylinder encounters resistance during rotation. The friction coefficient can be calculated based on the rotational torque of the friction cylinder and the positive pressure on the slider. It can be used for the lubricity evaluation of various drilling fluids such as water-based, oil-based and mixed-based drilling fluids. Samples can be added during the test process, so the lubricating effect of the lubricant can be evaluated.

[0006] Furthermore, the gland is connected to the top of the kettle body through threads, a handle is installed on the top of the gland, and an inner cover is installed on the bottom of the gland; a fan is installed on the bottom of the kettle body; and a valve is installed on the bottom of the kettle body.

[0007] The beneficial effect of adopting the above further technical solution is that the gland can be unscrewed or tightened through the thread between the gland and the kettle body by a handle, and the valve can be opened to facilitate the discharge of mud from the instrument and the cleaning of the lubricating instrument.

[0008] Furthermore, the rotating mechanism includes: a motor and a shaft, the shaft is connected to the motor, the motor is mounted on a motor support, and the friction cylinder is sleeved on the shaft through a pin and a friction cylinder fixing nut.

[0009] The beneficial effect of adopting the above further technical solution is that the friction cylinder is installed on the shaft, and the friction cylinder fixing nut fixes the friction cylinder. The motor installed on the motor support seat drives the friction cylinder to rotate through the shaft.

[0010] Furthermore, the transverse pressure cover is slidably mounted on one side of the kettle body; a guide pin is installed in the kettle body, and the slider is slidably mounted in the kettle body through the guide pin.

[0011] The beneficial effect of adopting the above further technical solution is that the lateral pressure cover pushes the slider close to the friction cylinder, and the slider and the friction cylinder rub against each other.

[0012] Furthermore, it also includes: a chassis cover, a chassis and a chassis base, the chassis is installed on the chassis base, the kettle body is installed in the chassis, and the chassis cover is installed on the chassis.

[0013] The beneficial effect of adopting the above further technical solution is that the chassis cover, the chassis and the chassis base form the entire instrument shell, which completely seals the instrument in the shell to avoid accidents that affect the safety of experimenters.

[0014] Furthermore, the rotating mechanism is connected to a torque sensor, which is installed on a sensor support seat, and the kettle body is connected to a temperature sensor and a pulse generator; a pressure gauge is installed between the transverse pressure cover and the slider, and the torque sensor, the temperature sensor, the pressure gauge and the pulse generator are all connected to a computer.

[0015] The beneficial effects of this further technical solution include: using nitrogen to increase pressurization and control the pressure between the slider and the ring, digitally displaying various data, and providing clearer and more stable parameter conditions. The computer can display the parameter change curves, more directly reflecting the lubrication properties of the drilling fluid and simulating the performance of the drilling fluid under deep well conditions. This overcomes the shortcomings of similar instruments with single readings and limited testing conditions. The friction coefficient can be calculated directly from the torque sensor value, or compared with the lubrication coefficient of the base slurry without lubricant added, outputting a relative value.

[0016] Furthermore, the sample adding device includes: a fixed measuring cylinder, an inner cylinder, a knob, a first one-way valve, a second one-way valve, and a threaded interface. The fixed measuring cylinder is connected to the inner cylinder through the first one-way valve, the inner cylinder is connected to the threaded interface through the second one-way valve, the knob is connected to the inner cylinder, and the threaded interface is connected to the kettle body; the fixed measuring cylinder is provided with a scale, and a lubricant is provided in the fixed measuring cylinder.

[0017] The beneficial effects of adopting this further technical solution are: the lubricant sampling device has a fixed measuring cylinder to determine the sample dosage, and two one-way valves are designed to allow lubricant to be added to the lubrication instrument during high-temperature and high-pressure experiments. This device is used to add a fixed amount of lubricant under high-pressure conditions during lubricity testing to evaluate lubrication performance. It can also be used to simulate the drill-freeing effect of adding lubricant when the drill is stuck during downhole drilling.

[0018] Furthermore, the pressurizing mechanism is a nitrogen pressurizing mechanism, the heating device is a heating sleeve, and the heating sleeve is arranged on the outside of the kettle body; drilling fluid or water is arranged in the kettle body.

[0019] The beneficial effect of adopting the above further technical solution is that the kettle body is heated by the outer heating jacket and pressurized by nitrogen. The drilling fluid or water in the kettle body acts as a lubricant.

[0020] In addition, the present invention also provides a lubrication performance testing method, which is a high-temperature and high-pressure lubrication instrument with a sampling device based on any one of the above-mentioned items. The lubrication performance testing method includes: adding lubricant to the heating device and adding base slurry to the kettle body; controlling the rotating mechanism to drive the friction cylinder to rotate at a preset speed; adjusting the pressure in the kettle body to a preset pressure through the pressurizing mechanism, and adjusting the temperature in the kettle body to a preset temperature through the heating device; recording the base slurry lubrication index; adding lubricant to the kettle body through the sampling device and running it for a preset time; and recording the change in the base slurry lubrication index after the lubricant is added.

[0021] The beneficial effects of the technical solution of the present invention are as follows: the slider and the friction cylinder are placed in the kettle, and the friction cylinder is fixed in the kettle by a dynamic seal, so that the lubricity of the drilling fluid can be evaluated under high temperature and high pressure conditions, which can better simulate the deep well environment and provide more reliable data. In addition, lubricant can be added during the experiment to simulate the effect of adding lubricant to release the drill when the drill is stuck underground, which can achieve a more accurate and reliable lubricity evaluation of the drilling fluid. The friction cylinder rotates under the drive of the rotating mechanism, and the slider approaches the friction cylinder under the push of the lateral pressure cover, and the friction cylinder and the slider will rub against each other. The friction cylinder encounters resistance during rotation. The friction coefficient can be calculated based on the rotational torque of the friction cylinder and the positive pressure on the slider. It can be used for the lubricity evaluation of various drilling fluids such as water-based, oil-based and mixed-based drilling fluids. Samples can be added during the test process, so the lubricating effect of the lubricant can be evaluated.

[0022] Furthermore, after the step of recording the change in the base slurry lubrication index after the lubricant is added, the method further comprises: changing the preset temperature, adjusting the temperature inside the kettle body to the changed preset temperature through the heating device, and recording the base slurry lubrication index; or, keeping the temperature unchanged, adding lubricant to the kettle body through the sample adding device, and running for a preset time; and recording the base slurry lubrication index.

[0023] The beneficial effect of adopting the above further technical solution is that it is easy to implement lubrication performance test experiments under different conditions.

[0024] Advantages of additional aspects of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic structural diagram of a high-temperature and high-pressure lubrication instrument with a sample adding device provided in an embodiment of the present invention.

[0026] Figure 2 Schematic diagram of drilling fluid lubricity evaluation provided by an embodiment of the present invention.

[0027] Figure 3 A schematic structural diagram of a chassis provided in an embodiment of the present invention.

[0028] Figure 4 A schematic structural diagram of a sample adding device provided in an embodiment of the present invention.

[0029] Explanation of the accompanying figures: 1. Handle; 2. Pressure cover; 3. Inner cover; 4. Kettle body; 5. Pin; 6. Horizontal pressure cover; 7. Slider; 8. Friction cylinder; 9. Guide pin; 10. Fan; 11. Torque sensor; 12. Motor; 13. Chassis cover; 14. Chassis; 15. Chassis base; 16. Friction cylinder fixing nut; 17. Shaft; 18. Fixed measuring cylinder; 19. Inner cylinder; 20. Knob; 21. First one-way valve; 22. Second one-way valve; 23. Threaded interface. DETAILED DESCRIPTION

[0030] The principles and features of the present invention are described below with reference to the accompanying drawings. The embodiments given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0031] like Figures 1 to 4 As shown, an embodiment of the present invention provides a high-temperature and high-pressure lubrication instrument with a sample adding device, including: a pressure cover 2, a kettle body 4, a transverse pressure cover 6, a slider 7, a friction cylinder 8, a rotating mechanism, a pressurizing mechanism, a heating device and a sample adding device, wherein the pressure cover 2 is installed on the top of the kettle body 4, the transverse pressure cover 6 is installed on one side of the kettle body 4, the slider 7 and the friction cylinder 8 are both located in the kettle body 4, the transverse pressure cover 6 is connected to the slider 7, the slider 7 is in contact with the friction cylinder 8, the rotating mechanism is connected to the friction cylinder 8, and the sample adding device, the pressurizing mechanism and the heating device are all connected to the kettle body 4.

[0032] The beneficial effects of the technical solution of the present invention are as follows: the slider and the friction cylinder are placed in the kettle, and the friction cylinder is fixed in the kettle by a dynamic seal, so that the lubricity of the drilling fluid can be evaluated under high temperature and high pressure conditions, which can better simulate the deep well environment and provide more reliable data. In addition, lubricant can be added during the experiment to simulate the effect of adding lubricant to release the drill when the drill is stuck underground, which can achieve a more accurate and reliable lubricity evaluation of the drilling fluid. The friction cylinder rotates under the drive of the rotating mechanism, and the slider approaches the friction cylinder under the push of the lateral pressure cover, and the friction cylinder and the slider will rub against each other. The friction cylinder encounters resistance during rotation. The friction coefficient can be calculated based on the rotational torque of the friction cylinder and the positive pressure on the slider. It can be used for the lubricity evaluation of various drilling fluids such as water-based, oil-based and mixed-based drilling fluids. Samples can be added during the test process, so the lubricating effect of the lubricant can be evaluated.

[0033] Figure 2This diagram illustrates the lubricity evaluation of drilling fluids. A friction cylinder moves in a circular motion. A slider, driven by positive pressure, approaches the cylinder, hindering its rotation. The cylinder's rotational torque reflects the magnitude of the friction force. According to Newton's law of friction, the coefficient of friction can be calculated based on the cylinder's rotational torque and the positive pressure. Figure 2 The circular arrows in the figure represent the rotation direction, rotation trajectory and torque (NM) of the friction cylinder, and the arrows represent the sliding direction, sliding trajectory and normal pressure (N) of the slider.

[0034] The present invention provides an instrument for measuring and evaluating the lubricity of drilling fluids, specifically a high-temperature, high-pressure lubrication instrument with a sample addition device. The instrument can be used to measure and evaluate the lubricity of various drilling fluids, including water-based, oil-based, and mixed-base fluids. Samples (lubricants) can be added midway during the test, allowing evaluation of the lubricating effect of the lubricant.

[0035] This invention places the slider and shaft in a kettle (a kettle body) and secures the shaft in place via a dynamic seal. This allows for the lubricity of drilling fluids to be evaluated and measured under high-temperature and high-pressure conditions, better simulating deep-well environments and providing more reliable data. Nitrogen is also used to increase pressure and control the pressure between the slider and the ring (friction cylinder). Various data are digitally displayed (on a computer screen), making each parameter more clear and stable.

[0036] like Figure 3 As shown, the housing is composed of a chassis cover 13, a chassis 14, and a chassis base 15, forming the entire instrument housing, which completely encloses the instrument in the shell to prevent accidents from affecting the safety of experimenters.

[0037] The entire test kettle consists of a handle 1, a pressure cap 2, an inner cover 3, a kettle body 4, a pin 5, a transverse pressure cap 6, a slider 7, a friction cylinder 8, a guide pin 9, a friction cylinder fixing nut 16, and a shaft 17. The pressure cap 2 can be unscrewed or tightened using the threaded connection between the pressure cap 2 and the kettle body 4 using the handle 1. After removing the pressure cap 2, the slider 7 can be placed into the bracket. The friction cylinder 8 is mounted on the shaft 17, and the friction cylinder fixing nut 16 secures the friction cylinder 8. The motor 12, mounted on the motor support, rotates the friction cylinder 8 via the shaft 17. Simultaneously, the transverse pressure cap 6 pushes the slider 7 toward the friction cylinder 8, causing friction between the slider 7 and the friction cylinder 8. At this point, the drilling fluid or water in the kettle body 4 acts as a lubricant, and the magnitude of the friction force is read by the torque sensor 11 mounted on the sensor support.

[0038] like Figures 1 to 4 As shown, further, the pressure cover 2 is connected to the top of the kettle body 4 through threads, the top of the pressure cover 2 is installed with a handle 1, and the bottom of the pressure cover 2 is installed with an inner cover 3; the bottom of the kettle body 4 is installed with a fan 10; the bottom of the kettle body 4 is installed with a valve.

[0039] The beneficial effect of adopting the above further technical solution is that the gland can be unscrewed or tightened through the thread between the gland and the kettle body by a handle, and the valve can be opened to facilitate the discharge of mud from the instrument and the cleaning of the lubricating instrument.

[0040] like Figures 1 to 4 As shown, further, the rotating mechanism includes: a motor 12 and a shaft 17, the shaft 17 is connected to the motor 12, the motor 12 is installed on the motor support, and the friction cylinder 8 is sleeved on the shaft 17 through the pin 5 and the friction cylinder fixing nut 16.

[0041] The beneficial effect of adopting the above further technical solution is that the friction cylinder is installed on the shaft, and the friction cylinder fixing nut fixes the friction cylinder. The motor installed on the motor support seat drives the friction cylinder to rotate through the shaft.

[0042] like Figures 1 to 4 As shown, further, the transverse pressure cover 6 is slidably installed on one side of the kettle body 4; a guide pin 9 is installed in the kettle body 4, and the slider 7 is slidably installed in the kettle body 4 through the guide pin 9.

[0043] The beneficial effect of adopting the above further technical solution is that the lateral pressure cover pushes the slider close to the friction cylinder, and the slider and the friction cylinder rub against each other.

[0044] like Figures 1 to 4 As shown, it further includes: a chassis cover 13, a chassis 14 and a chassis base 15, the chassis 14 is installed on the chassis base 15, the kettle body 4 is installed in the chassis 14, and the chassis cover 13 is installed on the chassis 14.

[0045] The beneficial effect of adopting the above further technical solution is that the chassis cover, the chassis and the chassis base form the entire instrument shell, which completely seals the instrument in the shell to avoid accidents that affect the safety of experimenters.

[0046] like Figures 1 to 4 As shown, further, the rotating mechanism is connected to a torque sensor 11, the torque sensor 11 is installed on a sensor support seat, and the kettle body 4 is connected to a temperature sensor and a pulse generator; a pressure gauge is installed between the transverse pressure cover 6 and the slider 7, and the torque sensor 11, the temperature sensor, the pressure gauge and the pulse generator are all connected to a computer.

[0047] The beneficial effects of this further technical solution include: using nitrogen to increase pressurization and control the pressure between the slider and the ring, digitally displaying various data, and providing clearer and more stable parameter conditions. The computer can display the parameter change curves, more directly reflecting the lubrication properties of the drilling fluid and simulating the performance of the drilling fluid under deep well conditions. This overcomes the shortcomings of similar instruments with single readings and limited testing conditions. The friction coefficient can be calculated directly from the torque sensor value, or compared with the lubrication coefficient of the base slurry without lubricant added, outputting a relative value.

[0048] like Figure 4 As shown, further, the sample adding device includes: a fixed measuring cylinder 18, an inner cylinder 19, a knob 20, a first one-way valve 21, a second one-way valve 22, and a threaded interface 23. The fixed measuring cylinder 18 is connected to the inner cylinder 19 through the first one-way valve 21, the inner cylinder 19 is connected to the threaded interface 23 through the second one-way valve 22, the knob 20 is connected to the inner cylinder 19, and the threaded interface 23 is connected to the kettle body 4; the fixed measuring cylinder 18 is provided with a scale, and the fixed measuring cylinder 18 is provided with a lubricant.

[0049] The beneficial effects of adopting this further technical solution are: the lubricant sampling device has a fixed measuring cylinder to determine the sample dosage, and two one-way valves are designed to allow lubricant to be added to the lubrication instrument during high-temperature and high-pressure experiments. This device is used to add a fixed amount of lubricant under high-pressure conditions during lubricity testing to evaluate lubrication performance. It can also be used to simulate the drill-freeing effect of adding lubricant when the drill is stuck during downhole drilling.

[0050] A piston is slidably provided in the inner cylinder 19 , and the piston is connected to the knob 20 .

[0051] like Figure 4 As shown, the sampling device is used to add a certain amount of lubricant under high pressure conditions in a lubricity test experiment to evaluate the lubrication effect. The lubricant sampling device (sampling device) has a fixed measuring cylinder 18 to determine the sample dosage. The two one-way valves are designed to add lubricant to the lubrication instrument during the high temperature and high pressure experiment. When the knob 20 is rotated counterclockwise, the first one-way valve 21 opens and the second one-way valve 22 closes, and the lubricant sample in the measuring cylinder (fixed measuring cylinder 18) is sucked into the inner cylinder 19 of the sampling device. Then, the knob 20 is rotated clockwise, the first one-way valve 21 closes and the second one-way valve 22 opens, so that the lubricant can be added to the lubrication instrument under high temperature and high pressure conditions.

[0052] Furthermore, the pressurizing mechanism is a nitrogen pressurizing mechanism, the heating device is a heating sleeve, and the heating sleeve is arranged on the outside of the kettle body 4; drilling fluid or water is arranged in the kettle body 4.

[0053] The beneficial effect of adopting the above further technical solution is that the kettle body is heated by the outer heating jacket and pressurized by nitrogen. The drilling fluid or water in the kettle body acts as a lubricant.

[0054] By placing the slider and ring (friction cylinder) in a kettle using a dynamic seal, the lubricity of drilling fluids can be evaluated under high-temperature and high-pressure conditions, simulating the state and lubricity of drilling fluids under deep-well conditions. Lubricant can also be added midway through the experiment, simulating the effect of adding lubricant to release the drill when the drill is stuck, enabling more accurate and reliable lubricity evaluation of the drilling fluid.

[0055] The present invention provides a high-temperature, high-pressure lubrication instrument with a sample loading device. The instrument (the kettle) is heated using an external heating jacket and pressurized with nitrogen. It primarily includes a temperature controller, a temperature sensor, a pressure gauge, a torque sensor 11, and a pulse generator. A computer displays the changing curves of various parameters, more clearly reflecting the lubrication properties of the drilling fluid and simulating the performance of the drilling fluid under deep-well conditions. This overcomes the shortcomings of similar instruments with their single readings and single test conditions.

[0056] The torque sensor 11 has a measuring range of 0-70 Nm, a measuring accuracy of 0.1 Nm, a repeatability of 0.1 Nm, and a resolution of 0.1 Nm.

[0057] The temperature controller has a range of -20-260°C and a measurement accuracy of 0.1°C.

[0058] The pressure gauge range is 0-12MPa and the adjustment accuracy is 0.1MPa.

[0059] The speed is 60RPM and the control accuracy is 1RPM.

[0060] like Figure 1 As shown, the high-temperature and high-pressure lubricator (a high-temperature and high-pressure lubricator with a sampling device) is composed of a chassis 13 and a test kettle. The kettle body 4 is filled with drilling fluid or water, and the outside of the kettle body 4 is provided with a heating device, so the inside of the kettle body 4 is a high-temperature and high-pressure environment. The friction cylinder 8 and the slider 7 are inside the kettle body 4, immersed in the drilling fluid or water. The friction cylinder 8 rotates under the drive of the motor 12, and the slider 7 is pushed by the transverse pressure cover 6 to approach the friction cylinder 8, and the friction cylinder 8 and the slider 7 will rub against each other. The resistance to the rotation of the friction cylinder 8 can be read by the torque sensor 11. The friction coefficient can be calculated by the rotational torque of the friction cylinder 8 and the positive pressure on the slider 7.

[0061] like Figure 4As shown, the lubricant sampling device (sampling device) has a fixed measuring cylinder 18 to determine the sample dosage. The two one-way valves are designed to allow lubricant to be added to the lubricator during high-temperature and high-pressure experiments. When the knob 20 is rotated counterclockwise, the first one-way valve 21 opens and the second one-way valve 22 closes, and the lubricant sample in the measuring cylinder (fixed measuring cylinder 18) is sucked into the inner cylinder 19 of the sampling device. Then, the knob 20 is rotated clockwise, the first one-way valve 21 closes and the second one-way valve 22 opens, allowing the lubricant to be added to the lubricator under high-temperature and high-pressure conditions. It is used to add a fixed amount of lubricant under high-pressure conditions in lubricity testing experiments to evaluate the lubrication effect. It can also be used to simulate the drilling-release effect of adding lubricant when the drill is stuck during downhole drilling.

[0062] The lubricating effect of the lubricant can be evaluated by directly calculating the friction coefficient based on the value of the torque sensor 11. On the other hand, the lubricating coefficient can be compared with the base slurry lubrication coefficient without adding lubricant to output a relative value, also called the reduction rate.

[0063] The embodiment of the present invention provides a method for evaluating the performance of a lubricant by performing a sample addition test using the above-mentioned device (a high-temperature and high-pressure lubrication instrument with a sample addition device), comprising the following steps:

[0064] After assembling the lubricant dosing device (dosing device), add the required lubricant.

[0065] Install the lubricant dosing device on the lubricator (high-temperature and high-pressure lubricator with dosing device) and check whether the seal is intact to prevent air leakage during dosing.

[0066] When lubricant sample needs to be added during the experiment, the knob 20 on the lubricant adding device is rotated counterclockwise to suck the lubricant stored in the fixed measuring cylinder 18 into the lubricant adding device. The amount of the added sample can be accurately adjusted by the scale of the fixed measuring cylinder 18.

[0067] Turn knob 20 clockwise to pump lubricant into the lubricator.

[0068] (1) The present invention provides a lubricant sampling device for a high-temperature and high-pressure lubricator (a high-temperature and high-pressure lubricator with a sampling device), which can evaluate the lubricity of mud under high-temperature and high-pressure conditions and test the effect of the added lubricant during the experiment.

[0069] (2) The present invention can evaluate the lubricity of drilling fluids and the influence of lubricants under ultra-high temperature and high pressure, with the maximum temperature reaching 260°C and the maximum pressure reaching 12 MPa. In addition, the present invention is easy to operate and has no redundant operations.

[0070] (3) The present invention adopts dynamic sealing and transmission power, which enables the instrument to measure the lubricity of drilling fluid and the sampling operation of lubricant under high temperature and high pressure conditions.

[0071] (4) The present invention adopts an external computer display, which can indirectly and clearly reflect various data and their change curves, making the operation more convenient and labor-saving, and the data processing and recording more rapid and accurate.

[0072] (5) The present invention has good use effect, high economic benefit, simple and convenient operation; it realizes the lubricity of drilling fluid under simulated actual drilling conditions and the effect of post-addition lubricant.

[0073] In addition, the present invention also provides a lubrication performance testing method, which is a high-temperature and high-pressure lubrication instrument with a sampling device based on any one of the above-mentioned items. The lubrication performance testing method includes: adding lubricant to the heating device and adding base slurry to the kettle body; controlling the rotating mechanism to drive the friction cylinder to rotate at a preset speed; adjusting the pressure in the kettle body to a preset pressure through the pressurizing mechanism, and adjusting the temperature in the kettle body to a preset temperature through the heating device; recording the base slurry lubrication index; adding lubricant to the kettle body through the sampling device and running it for a preset time; and recording the change in the base slurry lubrication index after the lubricant is added.

[0074] The beneficial effects of the technical solution of the present invention are as follows: the slider and the friction cylinder are placed in the kettle, and the friction cylinder is fixed in the kettle by a dynamic seal, so that the lubricity of the drilling fluid can be evaluated under high temperature and high pressure conditions, which can better simulate the deep well environment and provide more reliable data. In addition, lubricant can be added during the experiment to simulate the drilling effect of adding lubricant when the drill is stuck downhole, which can achieve a more accurate and reliable lubricity evaluation of the drilling fluid. The friction cylinder rotates under the drive of the rotating mechanism, and the slider approaches the friction cylinder under the push of the lateral pressure cover, and the friction cylinder and the slider will rub against each other. The friction cylinder encounters resistance during rotation. The friction coefficient can be calculated based on the rotational torque of the friction cylinder and the positive pressure on the slider. It can be used for the lubricity evaluation of various drilling fluids such as water-based, oil-based and mixed-based. Samples can be added during the test process, so the lubricating effect of the lubricant can be evaluated.

[0075] Furthermore, after the step of recording the change in the base slurry lubrication index after the lubricant is added, the method further comprises: changing the preset temperature, adjusting the temperature inside the kettle body to the changed preset temperature through the heating device, and recording the base slurry lubrication index; or, keeping the temperature unchanged, adding lubricant to the kettle body through the sample adding device, and running for a preset time; and recording the base slurry lubrication index.

[0076] The beneficial effect of adopting the above further technical solution is that it is easy to implement lubrication performance test experiments under different conditions.

[0077] Example 1

[0078] Fill the lubricant injector (injector) with 10 ml of the prepared lubricant.

[0079] Add the pre-configured base slurry to the lubrication instrument test kettle, connect the pipeline, install the experimental equipment, and set the stirring speed in the test kettle to 60r / min.

[0080] Cover the test kettle lid (pressure cap) to ensure that the seal is intact, pressurize the pressure in the test kettle (kettle body) to 1MPa through the nitrogen bottle, set the required temperature for the experiment, turn on the heating switch to start heating.

[0081] When heated to the specified temperature and the pressure remains unchanged, record the base slurry lubricity index at this time, add 10ml of lubricant through the lubricant adding device, run for 5 minutes, observe and record the change in the base slurry lubricity index after adding the lubricant; then change the set temperature, and when the instrument reaches the set temperature again, observe and record the lubricity index at this time.

[0082] Turn off the heating switch, wait until the temperature cools down to below 60 degrees Celsius, slowly release the pressure to prevent mud from entering the pipeline, then open the valve stem on the side of the instrument to discharge the mud (base slurry) out of the instrument, open the test kettle cover and clean it.

[0083] Example 2

[0084] Fill the lubricant injector with 20 ml of the prepared lubricant.

[0085] Add pre-configured base slurry (drilling fluid or water) to the lubrication instrument test kettle, connect the pipeline, install the experimental equipment, and set the stirring speed in the test kettle to 60r / min.

[0086] Close the lid of the test kettle to ensure that it is sealed properly. Pressurize the pressure inside the test kettle to 1 MPa using a nitrogen bottle. Set the required temperature for the experiment and turn on the heating switch to start heating.

[0087] When heated to the specified temperature and the pressure remains unchanged, record the base slurry lubricity index at this time, add 10 ml of lubricant through the lubricant adding device, run for 5 minutes, observe and record the changes in the base slurry lubricity index after adding the lubricant; then keep the temperature unchanged, add the remaining 10 ml of lubricant in the lubricant adding device again, run for 5 minutes, observe and record the lubricity index at this time.

[0088] Turn off the heating switch, wait until the temperature cools down to below 60 degrees Celsius, slowly release the pressure to prevent mud from entering the pipeline, then open the valve stem on the side of the instrument (the valve stem set on the valve), discharge the mud from the instrument, open the test kettle cover and clean it.

[0089] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A high-temperature and high-pressure lubrication instrument with a sample adding device, characterized in that: include: A pressure cover, a kettle body, a transverse pressure cover, a slider, a friction cylinder, a rotating mechanism, a pressurizing mechanism, a heating device and a sample adding device. The pressure cover is installed on the top of the kettle body, the transverse pressure cover is installed on one side of the kettle body, the slider and the friction cylinder are both located in the kettle body, the transverse pressure cover is connected to the slider, the slider abuts against the friction cylinder, the rotating mechanism is connected to the friction cylinder, and the sample adding device, the pressurizing mechanism and the heating device are all connected to the kettle body.

2. A high-temperature and high-pressure lubrication instrument with a sample adding device according to claim 1, characterized in that: The gland is connected to the top of the kettle body through threads, a handle is installed on the top of the gland, and an inner cover is installed on the bottom of the gland; a fan is installed on the bottom of the kettle body; and a valve is installed on the bottom of the kettle body.

3. The high-temperature and high-pressure lubrication instrument with a sample adding device according to claim 1, characterized in that: The rotating mechanism includes: a motor and a shaft, the shaft is connected to the motor, the motor is installed on a motor support, and the friction cylinder is sleeved on the shaft through a pin and a friction cylinder fixing nut.

4. The high-temperature and high-pressure lubrication instrument with a sample adding device according to claim 1, characterized in that: The transverse pressure cover is slidably mounted on one side of the kettle body; a guide pin is mounted in the kettle body, and the slider is slidably mounted in the kettle body through the guide pin.

5. The high-temperature and high-pressure lubrication instrument with a sample adding device according to claim 1, characterized in that: Also includes: A chassis cover, a chassis and a chassis base, wherein the chassis is mounted on the chassis base, the kettle body is mounted in the chassis, and the chassis cover is mounted on the chassis.

6. The high-temperature and high-pressure lubrication instrument with a sample adding device according to claim 1, characterized in that: The rotating mechanism is connected to a torque sensor, which is installed on a sensor support seat. The kettle body is connected to a temperature sensor and a pulse generator. A pressure gauge is installed between the transverse pressure cover and the slider. The torque sensor, the temperature sensor, the pressure gauge and the pulse generator are all connected to a computer.

7. The high-temperature and high-pressure lubrication instrument with a sample adding device according to claim 1, characterized in that: The sample adding device includes: a fixed measuring cylinder, an inner cylinder, a knob, a first one-way valve, a second one-way valve, and a threaded interface. The fixed measuring cylinder is connected to the inner cylinder through the first one-way valve, the inner cylinder is connected to the threaded interface through the second one-way valve, the knob is connected to the inner cylinder, and the threaded interface is connected to the kettle body. The fixed measuring cylinder is provided with a scale, and a lubricant is provided in the fixed measuring cylinder.

8. The high-temperature and high-pressure lubrication instrument with a sample adding device according to claim 1, characterized in that: The pressurizing mechanism is a nitrogen pressurizing mechanism, the heating device is a heating sleeve, and the heating sleeve is arranged on the outside of the kettle body; drilling fluid or water is arranged in the kettle body.

9. A lubrication performance testing method, characterized in that: Based on the high-temperature and high-pressure lubrication instrument with a sample adding device according to any one of claims 1 to 8, the lubrication performance testing method includes: Add lubricant to the heating device and add base slurry to the kettle; Control the rotating mechanism to drive the friction cylinder to rotate according to the preset speed; The pressure in the kettle is adjusted to a preset pressure by the pressurizing mechanism, and the temperature in the kettle is adjusted to a preset temperature by the heating device; Record the base slurry lubricity index; Add lubricant to the kettle through the dosing device and run for a preset time; Record the changes in the base slurry lubrication index after adding lubricant.

10. A lubrication performance testing method according to claim 9, characterized in that: After the step of recording the change in the base slurry lubrication index after the lubricant is added, the method includes: The preset temperature is changed, and when the temperature in the kettle body is adjusted to the changed preset temperature by the heating device, the base slurry lubrication index is recorded; Alternatively, keep the temperature constant, add lubricant to the kettle through the dosing device, and run for a preset time; Record the base slurry lubricity index.

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