Experimental system for measuring dielectric constant of drilling fluids

Abstract

The present disclosure relates to the technical field of oil and gas well drilling, and particularly relates to an experimental system for measuring dielectric constant of drilling fluid, comprising a reaction kettle body, a pressure unit, a temperature unit and a dielectric constant sensor. In the process of oil and gas well drilling operation, whether overflow phenomenon occurs in the oil and gas well is determined by monitoring the fluctuation of the dielectric constant of the drilling fluid in real time. However, the change of physical conditions such as pressure and temperature of the drilling fluid will also cause the fluctuation of the dielectric constant. If the fluctuation of the dielectric constant caused by the change of the physical conditions is not excluded, the accuracy of the overflow monitoring will be affected. In the present application, the pressure unit and the temperature unit are used to change the pressure and temperature of the drilling fluid respectively, so as to obtain the change relationship between the pressure and temperature of the drilling fluid and the dielectric constant, and then determine whether the fluctuation of the dielectric constant of the drilling fluid in the oil and gas well is caused by the change of the physical conditions such as pressure and temperature according to the change relationship, thereby improving the accuracy of the overflow monitoring.

Description

Technical Field

[0001] This disclosure relates to the technical field of oil and gas well drilling, and more particularly to an experimental system for measuring the dielectric constant of drilling fluids. Background Technology

[0002] During oil and gas well drilling operations, complex factors such as narrow safety density windows and high-temperature, high-pressure formations can lead to frequent overflows. Failure to detect these overflows in a timely manner can easily trigger well blowouts. Therefore, timely monitoring of overflows is crucial for ensuring drilling safety. Real-time measurement of the dielectric constant of the drilling fluid in the oil and gas well is a highly effective method for monitoring overflows. Specifically, this involves comparing the measured dielectric constant value with a pre-defined threshold value.

[0003] However, different physical properties such as temperature and pressure can also cause changes in the dielectric constant of drilling fluid. In other words, this method is very likely to misjudge fluctuations in dielectric constant caused by changes in physical properties such as temperature and pressure as overflow. Therefore, in order to avoid the influence of physical properties such as temperature and pressure on overflow monitoring, it is necessary to clarify the effects of temperature changes, pressure changes, and other physical property changes on dielectric constant, that is, the relationship between each physical property and the change in dielectric constant, so as to eliminate the dielectric constant fluctuations caused by changes in physical properties and thus improve the accuracy of overflow monitoring. Summary of the Invention

[0004] One of the technical problems that this disclosure aims to solve is the inability to obtain the effect of changes in physical property conditions on the dielectric constant.

[0005] To address the aforementioned technical problems, this disclosure provides an experimental system for measuring the dielectric constant of drilling fluids, comprising:

[0006] The reaction vessel body forms a reaction chamber for containing drilling fluids;

[0007] A pressure unit is used to regulate the pressure of the drilling fluid within the reaction chamber;

[0008] A temperature unit is used to regulate the temperature of the drilling fluid within the reaction chamber;

[0009] The dielectric constant sensor comes into contact with the drilling fluid within the reaction chamber.

[0010] In some embodiments, the experimental system for measuring the dielectric constant of drilling fluids further includes:

[0011] A liquid injection unit, connected to the reaction chamber and including a liquid container and a liquid volume measuring device; and

[0012] A gas injection unit is connected to the reaction chamber and includes a gas container and a gas volume measuring device;

[0013] The fluid recovery unit is connected to the reaction chamber.

[0014] In some embodiments, there are multiple liquid containers and multiple liquid volume measuring devices, and the multiple liquid containers and multiple liquid volume measuring devices are arranged in a one-to-one correspondence, and the multiple liquid containers are arranged in parallel.

[0015] In some embodiments, the fluid recovery unit includes a condenser, a back pressure valve, a gas-liquid separator, and a gas measuring device connected in sequence, with the condenser arranged relatively close to the reactor body along the fluid flow direction.

[0016] In some embodiments, the experimental system for measuring the dielectric constant of drilling fluid further includes a data acquisition module that is communicatively connected to the dielectric constant sensor and is capable of adjusting the measurement frequency of the dielectric constant sensor.

[0017] In some implementations, the data acquisition module is communicatively connected to both the pressure unit and the temperature unit, and is configured as follows:

[0018] Obtain pressure, temperature, and dielectric constant;

[0019] The relationship between the pressure and the dielectric constant is obtained based on the pressure and the dielectric constant.

[0020] The relationship between temperature and dielectric constant is obtained based on the temperature and dielectric constant.

[0021] In some embodiments, the number of dielectric constant sensors is multiple, with at least one disposed at the bottom of the reactor body and at least one disposed on the side of the reactor body.

[0022] In some embodiments, the experimental system for measuring the dielectric constant of drilling fluids further includes:

[0023] The stirring mechanism includes a stirring element and a stirring drive element that is driven to connect with the stirring element, wherein the stirring element is located within the reaction chamber.

[0024] In some embodiments, the flipping mechanism includes a flipping rod and a flipping drive, with the two ends of the flipping rod connected to the reactor body and the flipping drive, respectively.

[0025] In some embodiments, the experimental system for measuring the dielectric constant of drilling fluids further includes a vacuum module connected to the reaction chamber.

[0026] In some embodiments, the experimental system for measuring the dielectric constant of drilling fluids further includes a cleaning module in communication with the reaction chamber.

[0027] Through the above technical solution, the experimental system for measuring the dielectric constant of drilling fluids provided in this disclosure has the following beneficial effects:

[0028] In the process of measuring the dielectric constant, the reaction chamber of the reactor vessel is filled with drilling fluid. The pressure of the drilling fluid is changed by a pressure unit, and the dielectric constant of the drilling fluid is measured in real time by a dielectric constant sensor to obtain the relationship between the pressure and the dielectric constant. Similarly, the pressure of the drilling fluid is changed by a temperature unit, and the dielectric constant of the drilling fluid is measured in real time by a dielectric constant sensor to obtain the relationship between the temperature and the dielectric constant. Furthermore, the pressure and temperature of the drilling fluid are changed separately by pressure and temperature units, and the dielectric constant of the drilling fluid is measured in real time by a dielectric constant sensor to obtain the relationship between the combined pressure and temperature conditions and the dielectric constant. In this application, the influence of changes in physical properties on the dielectric constant is obtained by acquiring the relationship between physical property conditions and dielectric constant changes, thereby eliminating dielectric constant fluctuations caused by changes in physical property conditions and improving the accuracy of overflow monitoring. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of the experimental system for measuring the dielectric constant of drilling fluids disclosed in this embodiment;

[0031] Figure 2 This is a schematic diagram of the structure of the reaction vessel, stirring mechanism, and tilting mechanism disclosed in the embodiments of this disclosure;

[0032] Figure 3 This is a schematic diagram of the structure of the liquid injection unit disclosed in this embodiment;

[0033] Figure 4 This is a schematic diagram of the gas injection unit disclosed in an embodiment of this disclosure;

[0034] Figure 5 This is a schematic diagram of the structure of the fluid recovery unit disclosed in this embodiment;

[0035] Figure 6This is a schematic diagram of the structure of the first vacuuming device disclosed in this embodiment;

[0036] Figure 7 This is a schematic diagram of the structure of the second vacuum device disclosed in this embodiment.

[0037] Explanation of reference numerals in the attached figures:

[0038] 100. Experimental System for Measuring the Dielectric Constant of Drilling Fluids; 1. Reactor Body; 2. Pressure Unit; 21. Pressure Controller; 22. Piston Pressurization Device; 23. Reactor Body Pressure Sensor; 3. Temperature Unit; 4. Stirring Mechanism; 41. Stirring Motor; 42. Magnetic Drive Component; 43. Stirring Paddle; 5. Tilting Mechanism; 51. Tilting Support; 52. Bearing Housing; 53. Tilting Rod; 54. Fuma Wheel; 55. Tilting Motor; 6. Liquid Injection Unit; 61. Liquid Container; 62. Liquid Loading Pump; 63. Piston; 64. Three-Way Shut-Off Valve; 65. Liquid Injection Check Valve; 66. Liquid Injection Pressure Sensor; 7. Gas Injection Unit; 71. Gas Container; 72. Pressure Regulating Valve; 73. Gas Injection 74. Pressure gauge; 75. Flow controller; 76. Gas injection check valve; 77. Gas injection pressure sensor; 88. Gas injection valve; 99. Fluid recovery unit; 10. Fluid recovery control valve; 11. Condenser; 20. Back pressure valve; 21. Back pressure buffer container; 22. Back pressure pump; 33. Gas-liquid separator; 44. Gas flow meter; 55. Trace gas monitoring device; 66. Fluid recovery pressure gauge; 77. Vacuum module; 88. First vacuum device; 99. Second vacuum device; 10. Vacuum pump; 11. Vacuum buffer container; 12. Negative pressure gauge; 13. Vacuum valve; 14. Vacuum control valve; 15. Cleaning module; 16. Data acquisition module; 17. Dielectric constant sensor. Detailed Implementation

[0039] The embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings and examples. The detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of this disclosure by way of example, but should not be used to limit the scope of this disclosure. This disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0040] like Figure 1 As shown in the figure, a specific embodiment of this application provides an experimental system 100 for measuring the dielectric constant of drilling fluid, including a reaction vessel 1, a pressure unit 2, a temperature unit 3, and a dielectric constant sensor 12. The reaction vessel 1 forms a reaction chamber for containing drilling fluid; the pressure unit 2 is used to adjust the pressure of the drilling fluid in the reaction chamber; the temperature unit 3 is used to adjust the temperature of the drilling fluid in the reaction chamber; and the dielectric constant sensor 12 is in contact with the drilling fluid in the reaction chamber.

[0041] During oil and gas well drilling operations, if the drilling fluid density cannot balance the formation fluid pressure, the formation fluid may be forced into the wellbore, a phenomenon known as a blowout. Blowouts are often a precursor to blowouts, which can easily lead to safety accidents. Therefore, early monitoring of blowouts is crucial. An effective method is to monitor the fluctuations in the dielectric constant of the drilling fluid in real time to determine if a blowout has occurred in the oil and gas well. However, the factors causing fluctuations in the dielectric constant are not limited to blowouts; the pressure, temperature, and other physical properties of the drilling fluid also contribute. In other words, changes in the pressure and temperature of the drilling fluid can also cause fluctuations in the dielectric constant. Since these physical properties change dynamically during drilling operations, it is essential to exclude fluctuations caused by changes in physical properties when using dielectric constant fluctuations to determine if a blowout has occurred in an oil and gas well. This will improve the accuracy of blowout monitoring.

[0042] Therefore, to eliminate the influence of changes in physical properties on the dielectric constant, it is necessary to obtain the relationship between the physical properties and the dielectric constant. In this application, the pressure and temperature of the drilling fluid are changed by the pressure unit 2 and the temperature unit 3, respectively, and the dielectric constant of the drilling fluid is measured in real time by the dielectric constant sensor 12 to obtain the relationship between the pressure and temperature of the drilling fluid and the dielectric constant. Based on this relationship, it can be determined whether the fluctuation of the dielectric constant of the drilling fluid in the oil and gas well is caused by changes in physical properties such as pressure and temperature, thereby improving the accuracy of overflow monitoring.

[0043] In some embodiments, the experimental system 100 for measuring the dielectric constant of drilling fluids further includes a liquid injection unit 6, a gas injection unit 7, and a fluid recovery unit 8. The liquid injection unit 6 is connected to the reaction chamber and includes a liquid container 61 and a liquid volume measuring device; the gas injection unit 7 is connected to the reaction chamber and includes a gas container 71 and a gas volume measuring device; and the fluid recovery unit 8 is connected to the reaction chamber.

[0044] Specifically, drilling fluids are generally mixtures of liquids and gases. The liquid injection unit 6 is used to inject drilling fluid, and the gas injection unit 7 is used to inject drilling gas. The drilling fluid and drilling gas mix in the reaction chamber to form a drilling fluid that conforms to actual working conditions. By changing the types of liquid and gas contained in the liquid container 61 and the gas container 71, different drilling fluids can be simulated, thereby enabling the experimental system 100 for measuring the dielectric constant of drilling fluids to simulate different drilling fluids, thus improving the practicality of the experimental system 100 for measuring the dielectric constant of drilling fluids.

[0045] It should be noted that, under special circumstances, the drilling fluid in actual working conditions may be either drilling liquid or drilling gas. This can be achieved by injecting drilling liquid into the reaction vessel 1 separately through the liquid injection unit 6 of this application or by injecting drilling gas into the reaction vessel 1 separately through the gas injection unit 7 of this application.

[0046] In fact, besides the temperature and pressure of the drilling fluid affecting its dielectric constant, the gas content of the drilling fluid also affects its dielectric constant, and the gas content of the drilling fluid in oil and gas wells changes constantly. In some embodiments, the fluid recovery unit 8 includes a gas-liquid separator 86 and a gas evolution measuring device, the gas evolution measuring device being disposed downstream of the gas-liquid separator 86.

[0047] In this application, a liquid volume measuring device can acquire the volume of drilling fluid injected into the reactor vessel 1, a gas volume measuring device can acquire the volume of drilling gas injected into the reactor vessel 1, a gas-liquid separator 86 can acquire the volume of recovered drilling fluid, and a gas evolution measuring device can acquire the volume of drilling gas evolved from the drilling fluid in the gas-liquid separator 86. The gas content of the drilling fluid is calculated based on the volume of drilling fluid injected into the reactor vessel 1, the volume of drilling gas injected into the reactor vessel 1, the volume of recovered drilling fluid, and the volume of drilling gas evolved from the drilling fluid in the gas-liquid separator 86. By repeatedly changing the gas content of the injected drilling fluid, the dielectric constant of the drilling fluid with different gas contents is measured to obtain the relationship between the gas content and the dielectric constant. Based on this relationship, the magnitude of the gas content of the drilling fluid during overflow is determined.

[0048] In some embodiments, there are multiple liquid containers 61 and multiple liquid volume measuring devices, and the multiple liquid containers 61 and multiple liquid volume measuring devices are arranged in a one-to-one correspondence, and the multiple liquid containers 61 are arranged in parallel.

[0049] Specifically, the drilling fluid can also be a mixture of different liquids. Different drilling fluids are filled in different liquid containers 61. The different drilling fluids are mixed in the reaction chamber to form a drilling fluid that conforms to the actual working conditions. By changing the type of drilling fluid filled in different liquid containers 61, different drilling fluids can be simulated. This allows the experimental system 100 for measuring the dielectric constant of drilling fluids to simulate drilling fluids composed of different drilling fluids, thereby improving the practicality of the experimental system 100 for measuring the dielectric constant of drilling fluids.

[0050] Similarly, the proportion of different liquid components in the drilling fluid also affects the dielectric constant of the drilling fluid. In this application, multiple liquid volume measuring devices can obtain the volume of different drilling fluids injected into the reactor body 1 to obtain the component proportion of the drilling fluid. By changing the component proportion of the injected drilling fluid multiple times, the dielectric constant of the drilling fluid with different component proportions is measured to obtain the relationship between the component proportion and the dielectric constant. Based on this relationship, the component proportion of the drilling fluid during overflow is determined.

[0051] In some embodiments, the experimental system 100 for measuring the dielectric constant of drilling fluids further includes a data acquisition module 11, which is communicatively connected to a dielectric constant sensor 12 and is capable of adjusting the measurement frequency of the dielectric constant sensor 12.

[0052] Specifically, the dielectric constant sensor 12 measures the dielectric constant of the drilling fluid inside the reactor vessel 1 in real time. The specific measurement frequency is set by the data acquisition module 11. The measurement frequency affects the relationship between various physical properties and the dielectric constant. Therefore, in this application, the dielectric constant of the drilling fluid at different measurement frequencies is measured by changing the measurement frequency multiple times to obtain the relationship between the measurement frequency and the dielectric constant. Based on this relationship, the measurement frequency of the drilling fluid during overflow is determined.

[0053] Furthermore, the data acquisition module 11 is communicatively connected to both the pressure unit 2 and the temperature unit 3 and is configured as follows:

[0054] Obtain pressure, temperature, and dielectric constant;

[0055] The relationship between pressure and dielectric constant is obtained based on pressure and dielectric constant.

[0056] The relationship between temperature and dielectric constant is obtained based on temperature and dielectric constant.

[0057] It is evident that the relationships between pressure and dielectric constant, as well as between temperature and dielectric constant, can be automatically acquired and generated into curves, thereby accelerating the experimental process and improving the accuracy of the results.

[0058] Furthermore, the data acquisition module 11 is communicatively connected to both the liquid volume measuring device and the gas volume measuring device. Through the data acquisition module 11, the component ratio of the drilling fluid can be automatically obtained, thereby automatically obtaining the relationship between the component ratio and the dielectric constant and forming a change curve, which accelerates the experimental process and improves the accuracy of the results.

[0059] In some embodiments, there are multiple dielectric constant sensors 12, with at least one disposed at the bottom of the reactor body 1 and at least one disposed on the side of the reactor body 1.

[0060] Drilling fluids are mixtures of drilling fluids and drilling gases, or a mixture of various drilling fluids. Inhomogeneous mixing can occur, leading to differences in dielectric constant at different locations. In this application, dielectric constant sensors 12 at different locations are used to measure the dielectric constant at each location. This allows for comparison of the dielectric constants at different locations and also enables the identification of malfunctions in each sensor 12, facilitating timely repair of any faulty sensors.

[0061] In some embodiments, the experimental system 100 for measuring the dielectric constant of drilling fluid further includes a stirring mechanism 4 and a tilting mechanism 5. The stirring mechanism 4 includes a stirring element and a stirring drive element connected to the stirring element, and the stirring element is located in the reaction chamber. The tilting mechanism 5 includes a tilting rod 53 and a tilting drive element, and the two ends of the tilting rod 53 are respectively connected to the reaction vessel body 1 and the tilting drive element.

[0062] Specifically, after the drilling fluid and drilling gas enter the reactor body 1, the drilling fluid is stirred by the stirring mechanism 4 and the reactor body 1 is flipped by the flipping mechanism 5, thereby improving the uniformity of the drilling fluid in the reactor body 1 and thus increasing the accuracy of the measured dielectric constant.

[0063] In some embodiments, the experimental system 100 for measuring the dielectric constant of drilling fluids also includes a vacuum module 9 connected to the reaction chamber. Before the experiment begins, the vacuum module 9 is used to remove interfering media from the reaction vessel 1 and pipelines to avoid the interfering media affecting the physical properties of the drilling fluid, thereby improving the reliability of the experimental system 100 for measuring the dielectric constant of drilling fluids.

[0064] In some embodiments, the experimental system 100 for measuring the dielectric constant of drilling fluid also includes a cleaning module 10 connected to the reaction chamber. After the experiment is completed, the drilling fluid in the reaction vessel 1 and pipeline is cleaned by the cleaning module 10 to avoid the drilling fluid used in this experiment affecting the physical properties of the drilling fluid used in the next experiment, thereby improving the reliability of the experimental system 100 for measuring the dielectric constant of drilling fluid.

[0065] Example

[0066] like Figure 1 As shown, the experimental system 100 for measuring the dielectric constant of drilling fluid in the exemplary embodiment of this application includes a reaction vessel 1, a stirring mechanism 4, a tilting mechanism 5, a pressure unit 2, a temperature unit 3, a dielectric constant sensor 12, a liquid injection unit 6, a gas injection unit 7, a fluid recovery unit 8, a data acquisition module 11, a vacuum module 9, a cleaning module 10, and pipelines connecting the various components.

[0067] like Figure 2As shown, the bottom of the reactor body 1 is provided with a gas inlet, a liquid inlet, a vacuum outlet, and a fluid outlet. These inlets are connected to the gas injection unit 7, the liquid injection unit 6, the vacuum module 9, and the fluid return unit pipelines, respectively. The reactor body 1 is heat-resistant up to 200°C. It has a pressure resistance of 80MPa, an inner diameter of 100mm, a height of 186mm, and a volume of approximately 1460ml.

[0068] The stirring mechanism 4 includes a stirring motor 41 as the stirring drive, a magnetic transmission component 42, and a stirring paddle 43 as the stirring component. The stirring paddle 43 is installed at the center of the bottom of the reactor body 1, and the maximum stirring speed is 300 r / min. To eliminate the influence of the magnetic field on the measurement accuracy of the dielectric sensor, the magnetic transmission component 42 is 500 mm away from the bottom of the reactor body 1.

[0069] The tilting mechanism 5 includes a tilting bracket 51, a bearing housing 52, a tilting rod 53, a rotary wheel 54, and a tilting motor 55 and a reducer as the tilting drive components. The rotary wheel 54 is installed at the bottom of the tilting bracket 51, and the bearing housing 52, the tilting motor 55, and the reducer are located at the top of the tilting bracket 51. One end of the tilting rod 53 passes through the bearing housing 52 and is driven by the reducer, and the other end of the tilting rod 53 is connected to the outer wall of the reactor body 1.

[0070] The pressure unit 2 includes a pressure controller 21, a piston pressurizing device 22, and a vessel pressure sensor 23. The piston pressurizing device 22 extends from the top of the reactor body 1 into the reaction chamber and divides the reaction chamber into a rod chamber and a rodless chamber. The rodless chamber is used to fill drilling fluid. The pressure controller 21 is used to control the piston pressurizing device 22 to pressurize the drilling fluid in the rodless chamber. The vessel pressure sensor 23 is communicatively connected to the data acquisition module 11 and monitors the pressure value of the drilling fluid in the reaction chamber.

[0071] Temperature unit 3 includes an electric heating tube, a temperature sensor, and a temperature controller. The electric heating tube is sleeved outside the reaction vessel body 1. The temperature controller is used to control the electric heating tube to heat the reaction vessel body 1. The temperature sensor is communicatively connected to the data acquisition module 11, and the temperature of the drilling fluid is transmitted to the data acquisition module 11.

[0072] Two dielectric constant sensors 12 are used, one installed at the bottom and the other on the right side of the reactor body 1. The center of the bottom dielectric constant sensor 12 is 16 mm from the inner left wall of the reactor body 1, while the center of the right-side dielectric constant sensor 12 is 50 mm from the bottom of the reactor body 1. The probe diameter of the dielectric constant sensor 12 is 22 mm, and it is heat resistant to 175°C. Withstanding a pressure of 100 MPa. An insulating layer is sprayed onto the inner wall of the reactor body 1 at the installation location of the dielectric constant sensor 12 to prevent the charge generated by the drilling fluid during stirring due to static electricity accumulation from interfering with the measurement accuracy of the dielectric constant sensor 12, thereby improving the reliability of the experimental system 100 for measuring the dielectric constant of drilling fluid.

[0073] like Figure 3 As shown, the liquid injection module includes a liquid loading pump 62, a first liquid container 61, a second liquid container 61, a piston 63, a first three-way shut-off valve 64, a second three-way shut-off valve 64, a third three-way shut-off valve 64, a fourth three-way shut-off valve 64, a liquid injection check valve 65, and a liquid injection pressure sensor 66. The liquid loading pump 62 is connected to the first liquid container 61 and the second liquid container 61, has a volume of 2000ml, and a pressure resistance of 60MPa. A first three-way shut-off valve 64 is installed between the liquid loading pump 62 and the first liquid container 61, and a second three-way shut-off valve 64 is installed between the liquid loading pump 62 and the second liquid container 61, to select the liquid container 61 to be pressurized. The piston 63 is disposed inside the liquid container 61 to separate the drilling fluid from the pressurized liquid. The liquid loading pump 62 hydraulically pushes the piston 63 upward to inject the drilling fluid in the liquid container 61 into the reactor body 1, and automatically collects the injected volume. A liquid injection check valve 65 is installed between the liquid container 61 and the reactor body 1 to prevent backflow of drilling fluid in the reactor body 1.

[0074] like Figure 4 As shown, the gas injection module includes a gas container 71, a pressure regulating valve 72, a gas injection pressure gauge 73, a flow controller 74 (as a gas volume measuring device), a gas injection check valve 75, a gas injection pressure sensor 76, and a gas injection valve 77, connected in sequence. The gas injection valve 77 is located on the side closest to the reactor body 1 along the gas injection direction. The drilling gas in the gas container 71 mainly consists of methane, carbon dioxide, and nitrogen. The pressure regulating valve 72 is connected to the outlet of the gas container 71 to control the outlet pressure of the gas container 71, and the pressure value is displayed on the reading of the gas injection pressure gauge 73. The flow controller 74 is used to control the flow rate of the drilling gas flowing out of the gas container 71 and to measure the volume of the drilling gas injected into the reactor body 1. The flow rate range is 0-3000 ml / min, and the pressure resistance is 10 MPa. A gas injection check valve 75 is installed at the front end of the flow controller 74 to prevent backflow of fluid in the reactor body 1.

[0075] like Figure 5As shown, the fluid recovery unit 8 includes a fluid recovery control valve 81, a condenser 82, a back pressure valve 83, a back pressure buffer container 84, a back pressure pump 85, a gas-liquid separator 86, a gas flow meter 87, a trace gas monitoring device 88, and a fluid recovery pressure gauge 89. A fluid recovery control valve 81 is installed between the reactor body 1 and the condenser 82 to prevent drilling fluid in the reactor body 1 from flowing out into the condenser 82 during pressurization. The condenser 82 is used to quickly cool the high-temperature drilling fluid discharged from the reactor body 1 to room temperature.

[0076] A back pressure control device is formed by a back pressure valve 83, a back pressure buffer container 84, a back pressure pump 85, and a fluid recovery pressure gauge 89, and is connected to the condenser 82 to regulate the pressure upstream of the back pressure valve 83, thereby controlling the flow rate and volume of drilling fluid flowing out of the reactor body 1. Back pressure control valves are provided between the back pressure valve 83 and the back pressure buffer container 84, and between the back pressure pump 85 and the fluid recovery pressure gauge 89. A gas content measurement device is formed by the condenser 82, the back pressure valve 83, the gas-liquid separator 86, the gas flow meter 87, and the trace gas monitoring device 88. The condenser 82 is arranged relatively close to the reactor body 1 along the fluid flow direction. The gas flow meter 87 and the trace gas monitoring device 88 are both used as measuring devices for evolved gas. When the volume of evolved gas is less than 5 ml, the volume of evolved gas is the reading of the trace gas monitoring device 88; otherwise, it is the reading of the gas flow meter 87. The drilling fluid flowing out of the reactor body 1 flows into the gas-liquid separator 86 after passing through the condenser 82 and the back pressure valve 83. If the discharged drilling fluid contains dissolved gas, the precipitated gas first flows through the gas flow meter 87 and the trace gas monitoring device 88 to measure the volume of the precipitated gas.

[0077] The vacuum module 9 includes a first vacuum pump 93, a second vacuum pump 93, a first vacuum buffer container 94, a second vacuum buffer container 94, a first negative pressure gauge 95, a second negative pressure gauge 95, a first vacuum valve 96, a second vacuum valve 96, a third vacuum valve 96, and a fourth vacuum valve 96.

[0078] like Figure 6 As shown, the first vacuum pump 93, the first vacuum buffer container 94, the first negative pressure gauge 95, the first vacuum valve 96, and the third vacuum valve 97 constitute the first vacuum device 91. The air inlet of the first vacuum device 91 is located between the condenser 82 and the back pressure valve 83, and the air inlet of the first vacuum device 91 is also equipped with a first vacuum control valve 97 to switch the connection and disconnection between the first vacuum device 91 and the fluid recovery unit 8. The first vacuum device 91 is mainly used to remove interfering media in the fluid recovery unit 8.

[0079] like Figure 7As shown, the second vacuum pump 93, the second vacuum buffer container 94, the second negative pressure gauge 95, the second vacuum valve 96, and the fourth vacuum valve 97 constitute the second vacuum device 92. The air inlet of the second vacuum device 92 is connected to the reaction chamber, and the air inlet of the second vacuum device 92 is also equipped with a second vacuum control valve 97 to switch the connection and disconnection between the second vacuum device 92 and the reaction chamber. The second vacuum device 92 is mainly used to remove interfering media in the reaction chamber.

[0080] The cleaning module 10 includes a cleaning fluid injection pipeline and a cleaning fluid injection valve. The cleaning fluid injection pipeline is connected to the reaction chamber. The liquid loading pump 62 can also be connected to the cleaning fluid injection pipeline to pressurize the cleaning fluid in the cleaning fluid injection pipeline.

[0081] The data acquisition module 11 integrates parameter control and data acquisition during the experiment. On the one hand, it can control the temperature and pressure inside the reactor 1, the measurement frequency of the dielectric constant sensor 12, the flow rate of drilling fluid and drilling gas, the opening and closing of various valves, the rotation speed of the agitator 43, the rotation rate of the reactor 1, and the opening degree of the back pressure valve 83 through a computer. On the other hand, it can collect data such as the temperature and pressure inside the reactor 1, the measurement frequency of the dielectric constant sensor 12, the volume of drilling fluid and drilling gas injected into the reactor 1, the volume of drilling fluid and gas discharged from the reactor 1, and the dielectric constant of the drilling fluid inside the reactor 1. The data acquired by the computer can be processed to generate raw data reports, analysis reports, and graphs, and can also generate database file formats for flexible use by users.

[0082] Specific embodiments of this application also provide experimental steps for measuring different drilling fluids using an experimental system 100 for measuring the dielectric constant of drilling fluids.

[0083] Example 1

[0084] Measure the dielectric constant of water-based or oil-based drilling fluids under different temperatures, pressures, and measurement frequencies (taking water-based drilling fluids as an example; the experimental procedure is the same for oil-based drilling fluids):

[0085] Step 1: Connect the experimental setup, close all valves, and check if the data acquisition and control system circuit is functioning correctly;

[0086] Step 2: Introduce water-based drilling fluid into the first liquid container 61; activate the tilting mechanism 5 to tilt the reactor body 1 180° so that the gas inlet, liquid inlet, vacuum outlet, and fluid outlet at the bottom of the reactor body 1 face upwards; open the first three-way shut-off valve 64 and the third three-way shut-off valve 64, and start the liquid loading pump 62 to inject the water-based drilling fluid into the reactor body 1; close the first three-way shut-off valve 64 and the third three-way shut-off valve 64.

[0087] Step 3: Open the second vacuum control valve 97, start the second vacuum pump 93 to remove the interfering medium in the reactor body 1, turn off the second vacuum pump 93, and close the second vacuum control valve 97;

[0088] Step 4: Activate the flipping mechanism 5 to flip the reactor body 1 180° to restore the reactor body 1 to its initial state; use the pressure unit 2 to pressurize the water-based drilling fluid to the target pressure, observe for 10 minutes, and observe whether the reading of the reactor body pressure sensor 23 is stable. If it is stable, it indicates that the device is well sealed. Otherwise, it is necessary to re-check all connections until the sealing is good.

[0089] Step 5: Use temperature unit 3 to heat the water-based drilling fluid to the target temperature. After the temperature sensor reading stabilizes, use pressure unit 2 to pressurize the water-based drilling fluid to the target pressure. After the pressure sensor 23 stabilizes, ensure that the measurement frequencies of the two dielectric sensors are the same. Use data acquisition module 11 to collect the corresponding temperature, pressure, and dielectric constant of the water-based drilling fluid at the measurement frequency.

[0090] Step 6: Change the target temperature, target pressure, and measurement frequency, and repeat step 5 multiple times to collect the dielectric constant of water-based drilling fluid under different combinations of temperature, pressure, and measurement frequency.

[0091] Step 7: Set the pressure reduction pressure, open the back pressure control valve, adjust the front pressure of the back pressure valve 83 to the pressure reduction pressure, open the fluid recovery control valve 81, and some of the water-based drilling fluid in the reactor body 1 flows into the gas-liquid separator 86 for centralized treatment. Close the fluid recovery control valve 81, set the cooling temperature, and use the temperature unit 3 to adjust the water-based drilling fluid in the reactor body 1 to the cooling temperature;

[0092] Step 8: Reduce the pressure and temperature in stages, repeat step 7 multiple times to completely drain the water-based drilling liquid in reactor 1, and close the back pressure control valve.

[0093] Step 9: Open the cleaning fluid injection valve, start the liquid loading pump 62 to pump the cleaning fluid into the reactor body 1, start the stirring mechanism 4 to stir the cleaning fluid, close the cleaning fluid injection valve, open the fluid recovery control valve 81, use the pressure unit 2 to squeeze the cleaning fluid to the gas-liquid separator 86 for centralized processing, and close the fluid recovery control valve 81.

[0094] Step 10: Repeat step 9 multiple times to complete the cleaning of reactor body 1 and pipelines;

[0095] Step 11: After standing for 1 hour, open the first vacuum control valve 97 and start the first vacuum pump 93 to remove the residual liquid in the reactor body 1. Then, close the first vacuum pump 93 and the first vacuum control valve 97. Open the second vacuum control valve 97 and start the second vacuum pump 93 to remove the residual liquid in the pipeline. Then, close the second vacuum pump 93 and the second vacuum control valve 97.

[0096] Step 12: Organize and analyze the experimental data to obtain the dynamic response characteristics of the dielectric constant of water-based drilling fluid under multiple conditions. This will provide basic guidance for existing early overflow monitoring methods based on dielectric constant, reduce false alarms and missed alarms caused by dynamic changes in temperature and pressure during drilling, and provide basic data and theoretical support for subsequent overflow fluid type identification and overflow volume inversion. This is of great significance for ensuring drilling safety and reducing drilling costs.

[0097] Example 2

[0098] Measure the dielectric constant of drilling gases such as methane and carbon dioxide at different temperatures, pressures, and measurement frequencies (taking carbon dioxide as an example; the experimental procedures are the same for other gases):

[0099] Step 1: Connect the experimental setup, close all valves, and check if the data acquisition and control system circuit is functioning correctly;

[0100] Step 2: Open the second vacuum control valve 97, start the second vacuum pump 93 to remove the interfering medium in the reactor body 1, turn off the second vacuum pump 93, and close the second vacuum control valve 97;

[0101] Step 3: Inject the target volume of carbon dioxide into reactor body 1 using a gas injection module;

[0102] Step 4: Pressurize the carbon dioxide to the target pressure using pressure unit 2, observe for 10 minutes, and check whether the reading of pressure sensor 23 in the vessel is stable. If it is stable, it indicates that the device is well sealed. Otherwise, all connections need to be rechecked until the sealing is good.

[0103] Step 5: Use temperature unit 3 to heat carbon dioxide to the target temperature. After the temperature sensor reading stabilizes, use pressure unit 2 to pressurize carbon dioxide to the target pressure. After the pressure sensor 23 of the vessel stabilizes, ensure that the measurement frequencies of the two dielectric sensors are the same. Collect the corresponding temperature, pressure, and dielectric constant of carbon dioxide at the measurement frequency through data acquisition module 11.

[0104] Step 6: Change the target temperature, target pressure, and measurement frequency, and repeat step 5 multiple times to collect the dielectric constant of carbon dioxide under different combinations of temperature, pressure, and measurement frequency.

[0105] Step 7: Set the pressure reduction pressure, open the back pressure control valve, adjust the front pressure of the back pressure valve 83 to the pressure reduction pressure, open the fluid recovery control valve 81, and some of the carbon dioxide in the reactor body 1 flows into the gas-liquid separator 86 for centralized treatment. Close the fluid recovery control valve 81, set the cooling temperature, and use the temperature unit 3 to adjust the carbon dioxide in the reactor body 1 to the cooling temperature;

[0106] Step 8: Reduce the pressure and temperature in stages, repeating step 7 multiple times to completely expel the carbon dioxide from reactor body 1, and then close the back pressure control valve.

[0107] Step 9: Use the first vacuum device 91 to remove the residual carbon dioxide inside the reactor body 1, and use the second vacuum device 92 to remove the residual carbon dioxide inside the pipeline.

[0108] Step 10: Organize and analyze the experimental data to obtain the dynamic response characteristics of the dielectric constant of carbon dioxide under multiple conditions. This will provide basic guidance for existing early overflow monitoring methods based on dielectric constant, reduce false alarms and missed alarms caused by dynamic changes in temperature and pressure during drilling, and provide basic data and theoretical support for subsequent overflow fluid type identification and overflow volume inversion. This is of great significance for ensuring drilling safety and reducing drilling costs.

[0109] Example 3

[0110] Measure the dielectric constant of drilling fluids formed by mixing water-based drilling fluids or oil-based drilling fluids with oil or brine in different component ratios (taking drilling fluids formed by mixing oil-based drilling fluids and brine as an example; the experimental procedures are the same for other drilling fluids):

[0111] Step 1: Connect the experimental setup, close all valves, and check if the data acquisition and control system circuit is functioning correctly;

[0112] Step 2: Introduce oil-based drilling fluid into the first liquid container 61 and brine into the second liquid container 61; activate the tilting mechanism 5 to tilt the reactor body 1 180° so that the gas inlet, liquid inlet, vacuum outlet, and fluid outlet at the bottom of the reactor body 1 face upwards; activate the hydraulic loading pump and open the first three-way shut-off valve 64, the second three-way shut-off valve 64, the third three-way shut-off valve 64, and the fourth three-way shut-off valve 64 to inject the oil-based drilling fluid and brine into the reactor body 1 according to the target ratio;

[0113] Step 3: Open the second vacuum control valve 97, start the second vacuum pump 93 to remove the interfering medium in the reactor body 1, turn off the second vacuum pump 93, and close the second vacuum control valve 97;

[0114] Step 4: Activate the flipping mechanism 5 to flip the reactor body 1 180° to restore the reactor body 1 to its initial state; use the pressure unit 2 to pressurize the drilling fluid to the target pressure, observe for 10 minutes, and observe whether the reading of the reactor body pressure sensor 23 is stable. If it is stable, it indicates that the device is well sealed. Otherwise, it is necessary to re-check all connections until the sealing is good.

[0115] Step 5: Use temperature unit 3 to heat the drilling fluid to the target temperature. After the temperature sensor reading stabilizes, use pressure unit 2 to pressurize the drilling fluid to the target pressure. After the pressure sensor 23 stabilizes, ensure that the measurement frequencies of the two dielectric sensors are the same. Use data acquisition module 11 to collect the corresponding temperature, pressure, and dielectric constant of the drilling fluid at the measurement frequency.

[0116] Step 6: Change the target temperature, target pressure, and measurement frequency, and repeat step 5 multiple times to collect the dielectric constant of the drilling fluid under different combinations of temperature, pressure, and measurement frequency.

[0117] Step 7: Set the pressure reduction pressure, open the back pressure control valve, adjust the front pressure of the back pressure valve 83 to the pressure reduction pressure, open the fluid recovery control valve 81, and part of the drilling fluid in the reactor body 1 flows into the gas-liquid separator 86 for centralized processing. Close the fluid recovery control valve 81, set the cooling temperature, and use the temperature unit 3 to adjust the drilling fluid in the reactor body 1 to the cooling temperature;

[0118] Step 8: Reduce the pressure and temperature in stages, repeating step 7 multiple times to completely drain the drilling fluid from reactor body 1, and close the back pressure control valve.

[0119] Step 9: Open the cleaning fluid injection valve, start the liquid loading pump 62 to pump the cleaning fluid into the reactor body 1, start the stirring mechanism 4 to stir the cleaning fluid, close the cleaning fluid injection valve, open the fluid recovery control valve 81, use the pressure unit 2 to squeeze the cleaning fluid to the gas-liquid separator 86 for centralized processing, and close the fluid recovery control valve 81.

[0120] Step 10: Repeat step 9 multiple times to complete the cleaning of reactor body 1 and pipelines;

[0121] Step 11: After standing for 1 hour, open the first vacuum control valve 97 and start the first vacuum pump 93 to remove the residual liquid in the reactor body 1. Then, close the first vacuum pump 93 and the first vacuum control valve 97. Open the second vacuum control valve 97 and start the second vacuum pump 93 to remove the residual liquid in the pipeline. Then, close the second vacuum pump 93 and the second vacuum control valve 97.

[0122] Step 12: Change the ratio of oil-based drilling fluid to brine injected into reactor 1, and repeat steps 2 to 11 to obtain the dielectric constant of drilling fluids with different ratios under different temperature, pressure, and measurement frequency combinations; wherein, the formula for calculating the ratio of oil-based drilling fluid to brine is:

[0123]

[0124] In the formula, The ratio of oil-based drilling fluid to brine; m is the volume of oil-based drilling fluid injected into reactor body 1. 3 ; m is the volume of brine injected into reactor body 1. 3 .

[0125] Step 13: Organize and analyze experimental data to obtain the dynamic response characteristics of the dielectric constant of drilling fluids formed by mixing oil-based drilling fluids and brine under multiple conditions. This will provide basic guidance for existing early overflow monitoring methods based on dielectric constant, reduce false alarms and missed alarms caused by dynamic changes in temperature and pressure during drilling, and provide basic data and theoretical support for subsequent overflow fluid type identification and overflow volume inversion. This is of great significance for ensuring drilling safety and reducing drilling costs.

[0126] Example 4

[0127] Measure the dielectric constant of drilling fluids formed by mixing water-based drilling fluids or oil-based drilling fluids with gas in different component ratios (taking drilling fluids formed by mixing oil-based drilling fluids and carbon dioxide as an example; the experimental procedures are the same for other drilling fluids):

[0128] Step 1: Connect the experimental setup, close all valves, and check if the data acquisition and control system circuit is functioning correctly;

[0129] Step 2: Introduce the oil-based drilling fluid into the first liquid container 61; activate the tilting mechanism 5 to tilt the reactor body 1 180° so that the gas inlet, liquid inlet, vacuum outlet and fluid outlet at the bottom of the reactor body 1 face upwards; open the first three-way shut-off valve 64 and the third three-way shut-off valve 64, start the liquid loading pump 62 to inject the oil-based drilling fluid into the reactor body 1, and close the first three-way shut-off valve 64 and the third three-way shut-off valve 64.

[0130] Step 3: Open the second vacuum control valve 97, start the second vacuum pump 93 to remove the interfering medium in the reactor body 1, turn off the second vacuum pump 93, and close the second vacuum control valve 97;

[0131] Step 4: Inject the target volume of carbon dioxide into reactor body 1 using a gas injection module;

[0132] Step 5: Activate the flipping mechanism 5 to flip the reactor body 1 180° to restore the reactor body 1 to its initial state; use the pressure unit 2 to pressurize the drilling fluid to the target pressure, observe for 10 minutes, and observe whether the reading of the reactor body pressure sensor 23 is stable. If it is stable, it indicates that the device is well sealed. Otherwise, it is necessary to re-check all connections until the sealing is good.

[0133] Step 6: Start the stirring mechanism 4 and the tilting mechanism 5. Use the temperature unit 3 to heat the drilling fluid to the target temperature. After the temperature sensor reading stabilizes, use the pressure unit 2 to pressurize the drilling fluid to the target pressure. After the pressure sensor 23 stabilizes, ensure that the measurement frequencies of the two dielectric sensors are the same. Use the data acquisition module 11 to collect the corresponding temperature, pressure, and dielectric constant of the drilling fluid at the measurement frequency.

[0134] Step 7: After the stirring and flipping time is reached and the reactor body 1 is aligned with the initial position, turn off the stirring mechanism 4 and the flipping mechanism 5, and let it stand for 3 hours. After the free gas in the reactor body 1 and the drilling fluid containing dissolved gas have fully separated, set the pressure reduction, open the back pressure control valve, adjust the front pressure of the back pressure valve 83 to the pressure reduction pressure, open the fluid recovery control valve 81, and part of the drilling fluid containing dissolved gas in the reactor body 1 flows into the gas-liquid separator 86. Close the fluid recovery control valve 81. At the same time, use a gas flow meter 87 and a trace gas monitoring device 88 to measure the volume of dissolved gas, and the gas-liquid separator 86 to measure the volume of the discharged oil-based drilling fluid. Based on the volume of the oil-based drilling fluid injected into the reactor body 1, the volume of carbon dioxide injected into the reactor body 1, the volume of the precipitated carbon dioxide, and the volume of the discharged oil-based drilling fluid, calculate the gas content of the drilling fluid at the target temperature and target pressure. The formula for calculating the gas content of the drilling fluid is:

[0135]

[0136] In the formula, Gas content; When pressure is p Temperature is T The volume of free gas inside reactor 1, m 3 ; The volume of oil-based drilling fluid injected into reactor body 1 is m 3 ;

[0137] The calculation method is as follows:

[0138]

[0139] In the formula, Standard atmospheric pressure, MPa; Indoor temperature, K; p The pressure inside reactor 1 is in MPa; T The temperature inside reactor body 1, in K; m is the volume of carbon dioxide injected into reactor body 1. 3 ; m is the volume of carbon dioxide released. 3 ; m is the volume of oil-based drilling fluid discharged. 3 ; When pressure is The temperature is The gas compressibility factor at that time; When pressure is The temperature is The gas compressibility factor at that time.

[0140] Step 8: Set the pressure reduction pressure, open the back pressure control valve, adjust the front pressure of the back pressure valve 83 to the pressure reduction pressure, open the fluid recovery control valve 81, and the drilling fluid in the reactor body 1 flows into the gas-liquid separator 86 for centralized processing. Close the fluid recovery control valve 81, set the cooling temperature, and use the temperature unit 3 to adjust the water-based drilling fluid in the reactor body 1 to the cooling temperature;

[0141] Step 9: Reduce the pressure and temperature in stages, repeating step 7 multiple times to completely drain the water-based drilling liquid in reactor 1, and close the back pressure control valve.

[0142] Step 10: Open the cleaning fluid injection valve, start the liquid loading pump 62 to pump the cleaning fluid into the reactor body 1, start the stirring mechanism 4 to stir the cleaning fluid, close the cleaning fluid injection valve, open the fluid recovery control valve 81, use the pressure unit 2 to squeeze the cleaning fluid to the gas-liquid separator 86 for centralized processing, and close the fluid recovery control valve 81.

[0143] Step 11: Repeat step 9 multiple times to complete the cleaning of reactor body 1 and pipelines;

[0144] Step 12: After standing for 1 hour, open the first vacuum control valve 97 and start the first vacuum pump 93 to remove the residual liquid in the reactor body 1. Then, close the first vacuum pump 93 and the first vacuum control valve 97. Open the second vacuum control valve 97 and start the second vacuum pump 93 to remove the residual liquid in the pipeline. Then, close the second vacuum pump 93 and the second vacuum control valve 97.

[0145] Step 12: Change the ratio of oil-based drilling fluid and carbon dioxide injected into reactor 1, and repeat steps 2 to 12 to obtain the dielectric constant of drilling fluids with different ratios under different temperature, pressure and measurement frequency combinations.

[0146] Step 14: Organize and analyze experimental data to obtain the dynamic response characteristics of the dielectric constant of drilling fluids formed by mixing oil-based drilling fluids and carbon dioxide under multiple conditions. This will provide basic guidance for existing early overflow monitoring methods based on dielectric constant, reduce false alarms and missed alarms caused by dynamic changes in temperature and pressure during drilling, and provide basic data and theoretical support for subsequent overflow fluid type identification and overflow volume inversion. This is of great significance for ensuring drilling safety and reducing drilling costs.

[0147] These embodiments are provided to make the disclosure thorough and complete, and to fully express the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​set forth in these embodiments should be interpreted as exemplary only and not as limiting.

[0148] It should be noted that, in the description of this disclosure, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationship, are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0149] Furthermore, the terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. "Vertical" is not strictly vertical, but within the permissible margin of error. "Parallel" is not strictly parallel, but within the permissible margin of error. Terms such as "including" or "contains" mean that the element preceding the word encompasses the element listed after the word, and do not exclude the possibility of encompassing other elements as well.

[0150] It should also be noted that, in the description of this disclosure, unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure depending on the specific circumstances. When a particular device is described as being located between a first device and a second device, an intermediary device may or may not be present between the particular device and the first or second device.

[0151] All terms used in this disclosure have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0152] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0153] The embodiments of this disclosure have now been described in detail. To avoid obscuring the concept of this disclosure, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0154] While specific embodiments of this disclosure have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this disclosure. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any manner.

Claims

1. An experimental system for measuring the dielectric constant of a drilling fluid, characterized by, The experimental system for measuring dielectric constant of drilling fluid (100) comprises: a reactor body (1) forming a reaction cavity for containing drilling fluid; a pressure unit (2) for adjusting the pressure of the drilling fluid in the reaction cavity; a temperature unit (3) for adjusting the temperature of the drilling fluid in the reaction cavity; a dielectric constant sensor (12) in contact with the drilling fluid in the reaction cavity; The experimental system for measuring dielectric constant of drilling fluid (100) further comprises: a liquid injection unit (6) in communication with the reaction cavity and comprising a liquid container (61) and a liquid volume measuring element; a gas injection unit (7) in communication with the reaction cavity and comprising a gas container (71) and a gas volume measuring element; a fluid recovery unit (8) in communication with the reaction cavity.

2. The experimental system for measuring the dielectric constant of a drilling fluid of claim 1, wherein, The number of the liquid containers (61) and the liquid volume measuring elements are both multiple, and the multiple liquid containers (61) and the multiple liquid volume measuring elements are arranged one-to-one.

3. The experimental system for measuring the dielectric constant of a drilling fluid of claim 1, wherein, The fluid recovery unit (8) comprises a condenser (82), a back pressure valve (83), a gas-liquid separator (86) and a gas measuring element connected in sequence, and the condenser (82) is arranged relatively close to the reactor body (1) along the fluid flow direction.

4. The experimental system for measuring the dielectric constant of a drilling fluid of claim 1, wherein, The experimental system for measuring dielectric constant of drilling fluid (100) further comprises a data acquisition module (11) in communication connection with the dielectric constant sensor (12), and the data acquisition module (11) can adjust the measurement frequency of the dielectric constant sensor (12).

5. The experimental system for measuring the dielectric constant of a drilling fluid of claim 4, wherein, The data acquisition module (11) is in communication connection with the pressure unit (2) and the temperature unit (3), and is configured to: obtain pressure, temperature and dielectric constant; obtain the change relationship between pressure and dielectric constant according to the pressure and the dielectric constant; obtain the change relationship between temperature and dielectric constant according to the temperature and the dielectric constant.

6. The experimental system for measuring the dielectric constant of a drilling fluid of claim 1, wherein, The number of the dielectric constant sensors (12) is multiple, and at least one of which is arranged at the bottom of the reactor body (1), and at least one of which is arranged at the side of the reactor body (1).

7. The experimental system for measuring the dielectric constant of a drilling fluid of claim 1 wherein, The experimental system for measuring dielectric constant of drilling fluid (100) further comprises: a stirring mechanism (4) comprising a stirring element and a stirring driving element in driving connection with the stirring element, and the stirring element is located in the reaction cavity; and / or a turnover mechanism (5) comprising a turnover rod and a turnover driving element, and two ends of the turnover rod are connected with the reactor body (1) and the turnover driving element respectively.

8. The experimental system for measuring the dielectric constant of a drilling fluid of claim 1, wherein, The experimental system for measuring dielectric constant of drilling fluid (100) further comprises a vacuum pumping module (9) in communication with the reaction cavity.

9. The experimental system for measuring the dielectric constant of a drilling fluid of claim 1, wherein, The experimental system for measuring dielectric constant of drilling fluid (100) further comprises a cleaning module (10) in communication with the reaction cavity.

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