Experimental system for measuring dielectric constant of drilling fluid

Abstract

The invention relates to the technical field of oil and gas well drilling, in particular to an experimental system for measuring the dielectric constant of drilling fluid, which comprises a reaction kettle body, a pressure unit, a temperature unit and a dielectric constant sensor. In the oil-gas well drilling operation process, whether the overflow phenomenon occurs in an oil-gas well or not is judged by monitoring the fluctuation of the dielectric constant of drilling fluid in real time, but the fluctuation of the dielectric constant can also be caused by changes of physical conditions such as pressure and temperature of the drilling fluid, and if the fluctuation of the dielectric constant caused by the changes of the physical conditions is not eliminated, the overflow phenomenon is judged. If so, the accuracy of overflow monitoring is influenced. In the application, the pressure unit and the temperature unit are used for respectively changing the pressure and the temperature of the drilling fluid so as to obtain the change relationship between the pressure and the temperature of the drilling fluid and the dielectric constant; therefore, whether the fluctuation of the dielectric constant of the drilling fluid in the oil and gas well is caused by the change of physical property conditions such as pressure and temperature or not is judged according to the change relation, and the accuracy of overflow monitoring is further improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of oil and gas well drilling, and in particular to an experimental system for measuring the dielectric constant of drilling fluid. Background Art

[0002] During the drilling of oil and gas wells, due to the influence of complex factors such as narrow safety density window, high temperature and high pressure formation, overflow complex conditions may occur frequently. Once the occurrence of overflow complex conditions cannot be monitored in time, it is very easy to cause oil and gas well blowout. Therefore, timely monitoring of overflow complex conditions is of great guiding significance for ensuring the safety of drilling operations. Real-time measurement of the dielectric constant of the drilling fluid in the oil and gas well to monitor the occurrence of overflow complex conditions is a very effective way. Specifically, the measured value of the dielectric constant is compared with the set dielectric constant threshold.

[0003] However, different physical conditions such as temperature and pressure will also cause the dielectric constant of the drilling fluid to change. In other words, this method can easily misjudge the dielectric constant fluctuations caused by changes in physical conditions such as temperature and pressure as overflow. It can be seen that in order to avoid the influence of physical conditions such as temperature and pressure on the monitoring of overflow, it is necessary to clarify the influence of temperature changes on the dielectric constant, the influence of pressure changes on the dielectric constant, and the influence of other physical conditions on the dielectric constant, that is, the relationship between each physical condition and the dielectric constant, so as to eliminate the dielectric constant fluctuations caused by changes in physical conditions, thereby improving the accuracy of overflow monitoring. Summary of the invention

[0004] One technical problem to be solved by the present disclosure is that it is impossible to obtain the effect of changes in physical properties on the dielectric constant.

[0005] In order to solve the above technical problems, the present disclosure provides an experimental system for measuring the dielectric constant of drilling fluid, including:

[0006] A reactor body, forming a reaction chamber for containing drilling fluid;

[0007] a pressure unit, used for adjusting the pressure of the drilling fluid in the reaction chamber;

[0008] a temperature unit, used to adjust the temperature of the drilling fluid in the reaction chamber;

[0009] A dielectric constant sensor is in contact with the drilling fluid in the reaction chamber.

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

[0011] a liquid injection unit, connected to the reaction chamber and comprising a liquid container and a liquid volume measuring member; and

[0012] A gas injection unit, connected to the reaction chamber and comprising a gas container and a gas volume measuring member;

[0013] A fluid recovery unit is communicated with the reaction chamber.

[0014] In some embodiments, the number of the liquid containers and the liquid volume measuring devices are both plural, the multiple liquid containers and the multiple liquid volume measuring devices are arranged in 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, and the condenser is 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, which is communicatively connected to the dielectric constant sensor and can adjust the measurement frequency of the dielectric constant sensor.

[0017] In some embodiments, the data acquisition module is in communication with both the pressure unit and the temperature unit, and is configured as follows:

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

[0019] Obtaining a changing relationship between pressure and dielectric constant according to the pressure and the dielectric constant;

[0020] A variation relationship between temperature and dielectric constant is obtained according to the temperature and the dielectric constant.

[0021] In some embodiments, there are multiple dielectric constant sensors, at least one of which is disposed at the bottom of the reaction vessel body, and at least one of which is disposed at the side of the reaction vessel body.

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

[0023] The stirring mechanism comprises a stirring member and a stirring driving member drivingly connected to the stirring member, and the stirring member is located in the reaction chamber.

[0024] In some embodiments, the flip mechanism includes a flip rod and a flip driving member, and two ends of the flip rod are respectively connected to the reactor body and the flip driving member.

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

[0026] In some embodiments, the experimental system for measuring the dielectric constant of drilling fluid further includes a cleaning module connected to the reaction chamber.

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

[0028] In the process of measuring the dielectric constant, the reaction chamber of the reactor body is filled with drilling fluid, the pressure of the drilling fluid is changed by the pressure unit, and the dielectric constant of the drilling fluid is measured in real time by the dielectric constant sensor to obtain the relationship between the pressure and dielectric constant of the drilling fluid; the pressure of the drilling fluid is changed by the temperature unit, and the dielectric constant of the drilling fluid is measured in real time by the dielectric constant sensor to obtain the relationship between the temperature and dielectric constant of the drilling fluid; the pressure and temperature of the drilling fluid are changed by the pressure unit and the temperature unit respectively, and the dielectric constant of the drilling fluid is measured in real time by the dielectric constant sensor to obtain the relationship between the combined conditions of the pressure and temperature of the drilling fluid and the change of the dielectric constant. In the present application, the influence of the change of the physical property conditions on the dielectric constant is obtained by obtaining the change relationship between the physical property conditions and the dielectric constant, thereby eliminating the fluctuation of the dielectric constant caused by the change of the physical property conditions, and thus improving the accuracy of overflow monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 is a schematic diagram of the structure of an experimental system for measuring the dielectric constant of a drilling fluid disclosed in an embodiment of the present disclosure;

[0031] Figure 2 It is a schematic structural diagram of a reaction kettle body, a stirring mechanism and a flipping mechanism disclosed in an embodiment of the present disclosure;

[0032] Figure 3 is a structural schematic diagram of a liquid injection unit disclosed in an embodiment of the present disclosure;

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

[0034] Figure 5 is a schematic structural diagram of a fluid recovery unit disclosed in an embodiment of the present disclosure;

[0035] Figure 6is a schematic structural diagram of a first vacuum pumping device disclosed in an embodiment of the present disclosure;

[0036] Figure 7 It is a schematic structural diagram of a second vacuum pumping device disclosed in an embodiment of the present disclosure.

[0037] Description of reference numerals:

[0038] 100. Experimental system for measuring the dielectric constant of drilling fluid; 1. Reactor body; 2. Pressure unit; 21. Pressure controller; 22. Piston pressurizing device; 23. Reactor body pressure sensor; 3. Temperature unit; 4. Stirring mechanism; 41. Stirring motor; 42. Magnetic transmission part; 43. Stirring paddle; 5. Turning mechanism; 51. Turning bracket; 52. Bearing seat; 53. Turning rod; 54. Fumar wheel; 55. Turning motor; 6. Liquid injection unit; 61. Liquid container; 62. Liquid loading pump; 63. Piston; 64. Three-way stop 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 Pressure gauge; 74, flow controller; 75, gas injection check valve; 76, gas injection pressure sensor; 77, gas injection valve; 8, fluid recovery unit; 81, fluid recovery control valve; 82, condenser; 83, back pressure valve; 84, back pressure buffer container; 85, back pressure pump; 86, gas-liquid separator; 87, gas flow meter; 88, trace gas monitoring device; 89, fluid recovery pressure gauge; 9, vacuum module; 91, first vacuum device; 92, second vacuum device; 93, vacuum pump, 94, vacuum buffer container; 95, negative pressure gauge; 96, vacuum valve; 97, vacuum control valve; 10, cleaning module; 11, data acquisition module; 12, dielectric constant sensor. DETAILED DESCRIPTION

[0039] The following is a further detailed description of the embodiments of the present disclosure in conjunction with the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to exemplarily illustrate the principles of the present disclosure, but cannot be used to limit the scope of the present disclosure. The present disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

[0040] like Figure 1 As shown, a specific embodiment of the present application provides an experimental system 100 for measuring the dielectric constant of a drilling fluid, comprising a reactor body 1, a pressure unit 2, a temperature unit 3 and a dielectric constant sensor 12, wherein the reactor body 1 forms a reaction chamber for accommodating the 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 the drilling operation of oil and gas wells, the density of drilling fluid cannot balance the pressure of formation fluid, resulting in the formation fluid being pressed into the wellbore. This phenomenon is overflow. Overflow is often a precursor to blowout, and blowout is very likely to cause safety accidents. Therefore, it is necessary to monitor the overflow phenomenon early. An effective way is to determine whether overflow occurs in the oil and gas well by real-time monitoring of the fluctuation of the dielectric constant of the drilling fluid. However, the factors that cause the fluctuation of the dielectric constant are not only the overflow phenomenon, but also the physical conditions such as pressure and temperature of the drilling fluid. In other words, changes in the physical conditions such as pressure and temperature of the drilling fluid will also cause fluctuations in the dielectric constant, and the physical conditions of the drilling fluid will change dynamically during the drilling operation. It can be seen that when using the fluctuation of the dielectric constant to determine whether overflow occurs in the oil and gas well, it is necessary to exclude the fluctuation of the dielectric constant caused by the change of physical conditions, thereby improving the accuracy of overflow monitoring.

[0042] Then, if you want to eliminate the influence of physical property changes on the dielectric constant, you need to obtain the change relationship between the physical property 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 change relationship between the pressure and temperature of the drilling fluid and the dielectric constant, so as to judge whether the fluctuation of the dielectric constant of the drilling fluid in the oil and gas well is caused by the change of physical property conditions such as pressure and temperature based on this change relationship, thereby improving the accuracy of overflow monitoring.

[0043] In some embodiments, the experimental system 100 for measuring the dielectric constant of drilling fluid also includes a liquid injection unit 6, a gas injection unit 7 and a fluid recovery unit 8, wherein 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; the fluid recovery unit 8 is connected to the reaction chamber.

[0044] Specifically, drilling fluid is generally a mixture of liquid and gas. The liquid injection unit 6 is used to inject drilling liquid, and the gas injection unit 7 is used to inject drilling gas. The drilling liquid and drilling gas are mixed in the reaction chamber to form a drilling fluid that meets the actual working conditions. Different drilling fluids are simulated by changing the types of liquid and gas loaded in the liquid container 61 and the gas container 71, so that the experimental system 100 for measuring the dielectric constant of the drilling fluid can simulate different drilling fluids, thereby improving the practicality of the experimental system 100 for measuring the dielectric constant of the drilling fluid.

[0045] It should be noted that the drilling fluid in actual working conditions may be only drilling liquid or drilling gas under special circumstances, which can be achieved by injecting drilling liquid into the reactor body 1 through the liquid injection unit 6 in the present application or by injecting drilling gas into the reactor body 1 through the gas injection unit 7 in the present application.

[0046] In fact, in addition to the temperature and pressure of the drilling fluid affecting the dielectric constant of the drilling fluid, the gas content of the drilling fluid also affects the dielectric constant of the drilling fluid, and the gas content of the drilling fluid in the oil and gas well may change at any time. In some embodiments, the fluid recovery unit 8 includes a gas-liquid separator 86 and a precipitated gas measuring device, and the precipitated gas measuring device is arranged on the downstream side of the gas-liquid separator 86.

[0047] In the present application, the liquid volume measuring device can obtain the volume of the drilling liquid injected into the reactor body 1, the gas volume measuring device can obtain the volume of the drilling gas injected into the reactor body 1, the gas-liquid separator 86 can obtain the volume of the recovered drilling liquid, and the precipitated gas measuring device can obtain the volume of the drilling gas precipitated from the drilling fluid in the gas-liquid separator 86. The gas content of the drilling fluid is calculated according to the volume of the drilling liquid injected into the reactor body 1, the volume of the drilling gas injected into the reactor body 1, the volume of the recovered drilling liquid, and the volume of the drilling gas precipitated from the drilling fluid in the gas-liquid separator 86. The dielectric constant of the drilling fluid with different gas contents is measured by changing the gas content of the injected drilling fluid multiple times to obtain the changing relationship between the gas content and the dielectric constant, so as to determine the gas content of the drilling fluid during overflow according to this changing relationship.

[0048] In some embodiments, the number of liquid containers 61 and the liquid volume measuring devices are both multiple, the multiple liquid containers 61 and the multiple liquid volume measuring devices are arranged in 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 liquid containers 61 are used to load different drilling liquid injection units 6. Different drilling liquids are mixed in the reaction chamber to form drilling fluids that meet actual working conditions. Different drilling fluids are simulated by changing the types of drilling fluids loaded in different liquid containers 61, so that the experimental system 100 for measuring the dielectric constant of drilling fluids can simulate drilling fluids composed of different drilling liquids, thereby improving the practicality of the experimental system 100 for measuring the dielectric constant of drilling fluids.

[0050] Similarly, the component ratio of different liquids contained in the drilling fluid will also affect the dielectric constant of the drilling fluid. In the present application, multiple liquid volume measuring devices can obtain the volumes of different drilling liquids injected into the reactor body 1 to obtain the component ratio of the drilling fluid. The dielectric constants of drilling fluids with different component ratios are measured by repeatedly changing the component ratio of the injected drilling fluid to obtain the changing relationship between the component ratio and the dielectric constant, so as to determine the component ratio of the drilling fluid during overflow based on this changing relationship.

[0051] In some embodiments, the experimental system 100 for measuring the dielectric constant of drilling fluid further includes a data acquisition module 11 , which is in communication with the dielectric constant sensor 12 , and the data acquisition module 11 can adjust the measurement frequency of the dielectric constant sensor 12 .

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

[0053] Furthermore, the data acquisition module 11 is in communication connection with both the pressure unit 2 and the temperature unit 3 and is configured as follows:

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

[0055] According to the pressure and the dielectric constant, the relationship between the pressure and the dielectric constant is obtained;

[0056] The relationship between the change of temperature and the dielectric constant is obtained according to the temperature and the dielectric constant.

[0057] It can be seen that the changing relationship between pressure and dielectric constant, and the changing relationship between temperature and dielectric constant can be automatically acquired and form a changing curve, thereby speeding up the experimental process and improving the accuracy of the results.

[0058] In addition, the data acquisition module 11 is communicatively connected with both the liquid volume measuring device and the gas volume measuring device. The data acquisition module 11 can also automatically obtain the component ratio of the drilling fluid, thereby automatically obtaining the changing relationship between the component ratio and the dielectric constant and forming a changing curve, thereby speeding up the experimental process and improving the accuracy of the results.

[0059] In some embodiments, there are multiple dielectric constant sensors 12 , at least one of which is disposed at the bottom of the reaction vessel body 1 , and at least one of which is disposed at the side of the reaction vessel body 1 .

[0060] The drilling fluid is a mixture of drilling liquid and drilling gas or a mixture of multiple drilling fluids, and there may be uneven mixing, resulting in different dielectric constants at different locations. In the present application, the dielectric constants at different locations are measured by dielectric constant sensors 12 at different locations, so that the dielectric constants at different locations can be compared with each other, and it can also be determined whether each other has a fault, so that the faulty dielectric constant sensor 12 can be repaired in time.

[0061] In some embodiments, the experimental system 100 for measuring the dielectric constant of drilling fluid also includes a stirring mechanism 4 and a flipping mechanism 5, wherein the stirring mechanism 4 includes a stirring member and a stirring driving member connected to the stirring member, and the stirring member is located in the reaction chamber; the flipping mechanism 5 includes a flipping rod 53 and a flipping driving member, and the two ends of the flipping rod 53 are respectively connected to the reactor body 1 and the flipping driving member.

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

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

[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 cleaning module 10 is used to clean the reactor body 1 and the drilling fluid in the pipeline to avoid the drilling fluid used in this experiment from 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 the present application includes a reactor body 1, a stirring mechanism 4, a flipping 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, a gas inlet, a liquid inlet, a vacuum outlet and a fluid outlet are provided at the bottom of the reactor body 1, and the gas inlet, the liquid inlet, the vacuum outlet and the fluid outlet are respectively connected to the gas injection unit 7, the liquid injection unit 6, the vacuum module 9 and the fluid reflux unit pipeline; the reactor body 1 has a temperature resistance of 200°C, a pressure resistance of 80MPa, an inner diameter of 100mm, a height of 186mm, and a volume of about 1460ml.

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

[0069] The flip mechanism 5 includes a flip bracket 51, a bearing seat 52, a flip rod 53, a Foma wheel 54, and a flip motor 55 and a reducer as a flip driving member. The Foma wheel 54 is installed at the bottom of the flip bracket 51, and the top of the flip bracket 51 is provided with a bearing seat 52, a flip motor 55 and a reducer. One end of the flip rod 53 passes through the bearing seat 52 and is connected to the reducer drive, and the other end of the flip 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 kettle 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 load 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 kettle pressure sensor 23 is communicated with the data acquisition module 11 and monitors the pressure value of the drilling fluid in the reaction chamber.

[0071] The temperature unit 3 includes an electric heating tube, a temperature sensor and a temperature controller. The electric heating tube is sleeved outside the reactor body 1. The temperature controller is used to control the electric heating tube to heat the reactor 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] There are two dielectric constant sensors 12, which are installed at the bottom and right side of the reactor body 1, respectively. The center of the dielectric constant sensor 12 at the bottom is 16 mm away from the left inner wall of the reactor body 1, and the center of the dielectric constant sensor 12 at the right side is 50 mm away from the bottom of the reactor body 1. The probe diameter of the dielectric constant sensor 12 is 22 mm, and the temperature resistance is 175°C and the pressure resistance is 100 MPa. An insulating layer is sprayed on the inner wall surface of the reactor body 1 where the dielectric constant sensor 12 is installed to prevent the charge generated by the static electricity accumulation and other reasons during the stirring process of the drilling fluid 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 the 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 stop valve 64, a second three-way stop valve 64, a third three-way stop valve 64, a fourth three-way stop 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, with a volume of 2000ml and a pressure resistance of 60MPa. A first three-way stop valve 64 is installed between the liquid loading pump 62 and the first liquid container 61, and a second three-way stop 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 arranged in the liquid container 61 to separate the drilling liquid from the pressurized liquid. The liquid loading pump 62 pushes the piston 63 upward in a hydraulic form to inject the drilling liquid 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 the drilling fluid in the reactor body 1 from flowing back.

[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 arranged on a side close to the reactor body 1 along the gas injection direction. The drilling gas in the gas container 71 mainly includes methane, carbon dioxide, nitrogen, etc. 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 measure the volume of the drilling gas injected into the reactor body 1. The flow range is 0-3000ml / min and the pressure resistance is 10MPa. A gas injection check valve 75 is installed at the front end of the flow controller 74 to prevent the fluid in the reactor body 1 from flowing back.

[0075] like Figure 5 As 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 the drilling fluid in the reactor body 1 from flowing out to the condenser 82 during the pressurization process. The condenser 82 is used to quickly cool the high-temperature drilling fluid discharged from the reactor body 1 to room temperature.

[0076] The back pressure valve 83, the back pressure buffer container 84, the back pressure pump 85 and the fluid recovery pressure gauge 89 constitute a back pressure control device, and are connected to the condenser 82 to adjust the pressure on the upstream side of the back pressure valve 83, so as to control the flow rate and volume of the 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. 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 constitute a gas content measuring device. The condenser 82 is arranged relatively close to the reactor body 1 along the fluid flow direction. Among them, the gas flow meter 87 and the trace gas monitoring device 88 are both used as the precipitated gas measuring parts. When the volume of the precipitated gas is less than 5 ml, the volume of the precipitated 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 in sequence. 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 96 constitute the first vacuum device 91. The air inlet end of the first vacuum device 91 is arranged between the condenser 82 and the back pressure valve 83, and the air inlet end of the first vacuum device 91 is also provided 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 the interfering medium 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 96 constitute the second vacuum device 92. The air inlet end of the second vacuum device 92 is connected to the reaction chamber, and the air inlet end of the second vacuum device 92 is also provided 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 the interfering medium in the reaction chamber.

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

[0081] The data acquisition module 11 integrates the parameter control and data acquisition during the experiment. On the one hand, it can control the temperature and pressure in the reactor body 1, the measurement frequency of the dielectric constant sensor 12, the drilling liquid flow rate, the drilling gas flow rate, the opening and closing of each valve, the rotation speed of the stirring paddle 43, the turnover rate of the reactor body 1, the opening of the back pressure valve 83, etc. through the computer. On the other hand, it can collect the temperature and pressure in the reactor body 1, the measurement frequency of the dielectric constant sensor 12, the volume of the drilling liquid and the volume of the drilling gas injected into the reactor body 1, the volume of the drilling liquid and the volume of the precipitated gas discharged from the reactor body 1, the dielectric constant of the drilling fluid in the reactor body 1, etc. during the experiment. The data collected by the computer can be processed to generate raw data reports, analysis reports and curves, and can also generate database file formats for users to use flexibly.

[0082] The specific embodiment of the present application also provides experimental steps for measuring different drilling fluids using the experimental system 100 for measuring the dielectric constant of drilling fluids.

[0083] Example 1

[0084] Measure the dielectric constant of water-based drilling fluid or oil-based drilling fluid at different temperatures, pressures, and measurement frequencies (taking water-based drilling fluid as an example, the experimental steps for oil-based drilling fluid are the same):

[0085] Step 1: Connect the experimental device, close all valves, and check whether the data acquisition and control system circuits are normal;

[0086] Step 2: introduce the water-based drilling liquid into the first liquid container 61; start the flip mechanism 4 to flip the reactor body 1 180 degrees, so that the gas inlet, liquid inlet, vacuum outlet and fluid outlet at the bottom of the reactor body 1 face upward; open the first three-way stop valve 64 and the third three-way stop valve 64, start the liquid loading pump 62 to inject the water-based drilling liquid into the reactor body 1; close the first three-way stop valve 64 and the third three-way stop 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, close the second vacuum pump 93, and close the second vacuum control valve 97;

[0088] Step 4: Start the flip mechanism 4 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 means that the device has good sealing performance. Otherwise, it is necessary to recheck each connection until the sealing performance is good.

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

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

[0091] Step 7: Set the depressurization pressure, open the back pressure control valve, adjust the front end pressure of the back pressure valve 83 to the depressurization pressure, open the fluid recovery control valve 81, and part of the water-based drilling liquid 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 liquid in the reactor body 1 to the cooling temperature;

[0092] Step 8: reducing the decompression pressure and cooling temperature in a stepwise manner, repeating step 7 multiple times to discharge all the water-based drilling fluid in the reactor body 1, and closing the back pressure control valve;

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

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

[0095] Step 11: Stand still for 1 hour, open the first vacuum control valve 97, start the first vacuum pump 93 to remove the residual liquid in the reactor body 1, close the first vacuum pump 93 and the first vacuum control valve 97, open the second vacuum control valve 97, start the second vacuum pump 93 to remove the residual liquid in the pipeline, 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, provide basic law guidance for the existing early overflow monitoring methods based on dielectric constants, 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, which 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 steps for other gases are the same):

[0099] Step 1: Connect the experimental device, close all valves, and check whether the data acquisition and control system circuits are normal;

[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, close the second vacuum pump 93, and close the second vacuum control valve 97;

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

[0102] Step 4: Use the pressure unit 2 to pressurize the carbon dioxide to the target pressure, observe it for 10 minutes, and observe whether the reading of the kettle pressure sensor 23 is stable. If it is stable, it means that the device has good sealing performance. Otherwise, it is necessary to recheck each connection until it is well sealed.

[0103] Step 5: Use the temperature unit 3 to heat the carbon dioxide to the target temperature. After the reading of the temperature sensor is stable, use the pressure unit 2 to pressurize the carbon dioxide to the target pressure. After the reading of the kettle pressure sensor 23 is stable, ensure that the measurement frequencies of the two dielectric sensors are the same, and collect the corresponding temperature, pressure, and dielectric constant of carbon dioxide at the measurement frequency through the 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 temperature, pressure and measurement frequency combinations;

[0105] Step 7: Set the depressurization pressure, open the back pressure control valve, adjust the front end pressure of the back pressure valve 83 to the depressurization pressure, open the fluid recovery control valve 81, and part 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: Stepwisely reduce the decompression pressure and cooling temperature, repeat step 7 multiple times to discharge all the carbon dioxide in the reactor body 1, and close the back pressure control valve;

[0107] Step 9: using the first vacuum pumping device 91 to remove the residual carbon dioxide in the reactor body 1, and using the second vacuum pumping device 92 to remove the residual carbon dioxide in 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, provide basic law guidance for the 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, which 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 the drilling fluid formed by mixing oil-based drilling fluids and brine as an example, the experimental steps for other drilling fluids are the same):

[0111] Step 1: Connect the experimental device, close all valves, and check whether the data acquisition and control system circuits are normal;

[0112] Step 2: introducing the oil-based drilling liquid into the first liquid container 61, and introducing the brine into the second liquid container 61; starting the flip mechanism 4 to flip the reactor body 1 180 degrees, so that the gas inlet, liquid inlet, vacuum outlet and fluid outlet at the bottom of the reactor body 1 face upward; starting the hydraulic loading pump and opening the first three-way stop valve 64, the second three-way stop valve 64, the third three-way stop valve 64, and the fourth three-way stop valve 64, so as to inject the oil-based drilling liquid and the 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, close the second vacuum pump 93, and close the second vacuum control valve 97;

[0114] Step 4: Start the flip mechanism 4 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, and observe for 10 minutes to see whether the reading of the reactor body pressure sensor 23 is stable. If it is stable, it means that the device has good sealing performance. Otherwise, it is necessary to recheck each connection until the sealing performance is good.

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

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

[0117] Step 7: Set the depressurization pressure, open the back pressure control valve, adjust the front end pressure of the back pressure valve 83 to the depressurization 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 treatment. 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: reducing the decompression pressure and cooling temperature in a stepwise manner, repeating step 7 multiple times to discharge all the drilling fluid in the reactor body 1, and closing the back pressure control valve;

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

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

[0121] Step 11: Stand still for 1 hour, open the first vacuum control valve 97, start the first vacuum pump 93 to remove the residual liquid in the reactor body 1, close the first vacuum pump 93 and the first vacuum control valve 97, open the second vacuum control valve 97, start the second vacuum pump 93 to remove the residual liquid in the pipeline, close the second vacuum pump 93 and the second vacuum control valve 97;

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

[0123]

[0124] Where, λ is the ratio of oil-based drilling fluid to brine; V1 is the volume of oil-based drilling fluid injected into the reactor body 1, m 3 ; V2 is the volume of the brine injected into the reactor body 1, m 3 .

[0125] Step 13: Organize and analyze the experimental data to obtain the dynamic response characteristics of the dielectric constant of the drilling fluid formed by the mixture of oil-based drilling fluid and brine under multiple conditions, provide basic law guidance for the existing early overflow monitoring method 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, which 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 gases in different component ratios (taking the drilling fluid formed by mixing oil-based drilling fluids and carbon dioxide as an example, the experimental steps for other drilling fluids are the same):

[0128] Step 1: Connect the experimental device, close all valves, and check whether the data acquisition and control system circuits are normal;

[0129] Step 2: Introduce the oil-based drilling liquid into the first liquid container 61; start the flip mechanism 4 to flip the reactor body 1 180 degrees, so that the gas inlet, liquid inlet, vacuum outlet and fluid outlet at the bottom of the reactor body 1 face upward; open the first three-way stop valve 64 and the third three-way stop valve 64, start the liquid loading pump 62 to inject the oil-based drilling liquid into the reactor body 1, and close the first three-way stop valve 64 and the third three-way stop 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, close the second vacuum pump 93, and close the second vacuum control valve 97;

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

[0132] Step 5: Start the flip mechanism 4 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, and observe for 10 minutes to see whether the reading of the reactor body pressure sensor 23 is stable. If it is stable, it means that the device has good sealing performance. Otherwise, it is necessary to recheck each connection until the sealing performance is good.

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

[0134] Step 7: After the stirring and flipping setting time is reached and the reactor body 1 coincides with the initial state position, the stirring mechanism 4 and the flipping mechanism 5 are closed, and the reactor body 1 is left to stand for 3 hours. After the free gas in the reactor body 1 and the drilling fluid containing dissolved gas are fully stratified, the pressure reduction pressure is set, the back pressure control valve is opened, and the front end pressure of the back pressure valve 83 is adjusted to the pressure reduction pressure. The fluid recovery control valve 81 is opened, and part of the drilling fluid containing dissolved gas in the reactor body 1 flows into the gas-liquid separator 86, and the fluid recovery control valve 81 is closed; at the same time, the volume of dissolved gas is measured by the gas flow meter 87 and the trace gas monitoring device 88, and the gas-liquid separator 86 measures the volume of the discharged oil-based drilling fluid, so as to calculate the gas content of the drilling fluid at the target temperature and target pressure according to 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 precipitated carbon dioxide and the volume of the discharged oil-based drilling fluid; wherein, the calculation formula of the gas content of the drilling fluid is:

[0135]

[0136] Where α is the gas content; V5(p,T) is the volume of free gas in the reactor body 1 when the pressure is p and the temperature is T, m 3 ; V6 is the volume of oil-based drilling fluid injected into the reactor body 1, m 3 ;

[0137] V5(p,T) is calculated as follows:

[0138]

[0139] Wherein, p0 is standard atmospheric pressure, MPa; T0 is room temperature, K; p is pressure in reactor 1, MPa; T is temperature in reactor 1, K; V3(p0,T0) is volume of carbon dioxide injected into reactor 1, m 3; V4(p0,T0) is the volume of carbon dioxide released, m 3 ; V7 is the volume of the discharged oil-based drilling fluid, m 3 ; Z(p0,T0) is the gas compression factor when the pressure is p0 and the temperature is T0; Z(p,T) is the gas compression factor when the pressure is p and the temperature is T.

[0140] Step 8: Set the depressurization pressure, open the back pressure control valve, adjust the front end pressure of the back pressure valve 83 to the depressurization 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 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;

[0141] Step 9: reducing the decompression pressure and cooling temperature in a stepwise manner, repeating step 7 multiple times to discharge all the water-based drilling fluid in the reactor body 1, and closing the back pressure control valve;

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

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

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

[0145] Step 12: changing the ratio of the oil-based drilling fluid and the carbon dioxide injected into the reactor body 1, and repeating steps 2 to 12, so as to obtain the dielectric constants of the drilling fluids with different ratios under different temperature, pressure and measurement frequency combinations;

[0146] Step 14: Organize and analyze the experimental data to obtain the dynamic response characteristics of the dielectric constant of the drilling fluid formed by the mixture of oil-based drilling fluid and carbon dioxide under multiple conditions, provide basic law guidance for the existing early overflow monitoring method 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, which is of great significance for ensuring drilling safety and reducing drilling costs.

[0147] The present disclosure provides these embodiments to make the present disclosure thorough and complete, and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, and not as limiting.

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

[0149] In addition, the words "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" does not mean vertical in the strict sense, but is within the tolerance range. "Parallel" does not mean parallel in the strict sense, but is within the tolerance range. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0150] It should also be noted that in the description of the present disclosure, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0151] All terms used in the present disclosure have the same meanings as those understood by those of ordinary skill in the art to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, for example, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined as such herein.

[0152] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0153] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0154] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. An experimental system for measuring the dielectric constant of drilling fluid, characterized in that: include: A reaction vessel body (1) forming a reaction chamber for containing drilling fluid; A pressure unit (2) for adjusting the pressure of the drilling fluid in the reaction chamber; A temperature unit (3) for adjusting the temperature of the drilling fluid in the reaction chamber; A dielectric constant sensor (12) is in contact with the drilling fluid in the reaction chamber.

2. The experimental system for measuring the dielectric constant of drilling fluid according to claim 1, characterized in that: The experimental system (100) for measuring the dielectric constant of drilling fluid also includes: A liquid injection unit (6), which is in communication with the reaction chamber and comprises a liquid container (61) and a liquid volume measuring member; A gas injection unit (7), which is in communication with the reaction chamber and comprises a gas container (71) and a gas volume measuring device; A fluid recovery unit (8) is communicated with the reaction chamber.

3. The experimental system for measuring the dielectric constant of drilling fluid according to claim 2, characterized in that: The number of the liquid containers (61) and the liquid volume measuring devices are both multiple, the multiple liquid containers (61) and the multiple liquid volume measuring devices are arranged in one-to-one correspondence, and the multiple liquid containers (61) are arranged in parallel.

4. The experimental system for measuring the dielectric constant of drilling fluid according to claim 2, characterized in that: The fluid recovery unit (8) comprises a condenser (82), a back pressure valve (83), a gas-liquid separator (86) and a gas measuring device which are connected in sequence. The condenser (82) is arranged relatively close to the reaction kettle body (1) along the fluid flow direction.

5. The experimental system for measuring the dielectric constant of drilling fluid according to claim 1, characterized in that: The experimental system (100) for measuring the dielectric constant of drilling fluid further comprises a data acquisition module (11), wherein the data acquisition module (11) is communicatively connected to the dielectric constant sensor (12), and the data acquisition module (11) is capable of adjusting the measurement frequency of the dielectric constant sensor (12).

6. The experimental system for measuring the dielectric constant of drilling fluid according to claim 5, characterized in that: The data acquisition module (11) is in communication connection with both the pressure unit (2) and the temperature unit (3), and is configured as follows: Obtain pressure, temperature, and dielectric constant; Obtaining a changing relationship between pressure and dielectric constant according to the pressure and the dielectric constant; A variation relationship between temperature and dielectric constant is obtained according to the temperature and the dielectric constant.

7. The experimental system for measuring the dielectric constant of drilling fluid according to claim 1, characterized in that: The number of the dielectric constant sensors (12) is plural, at least one of which is arranged at the bottom of the reaction vessel body (1), and at least one of which is arranged at the side of the reaction vessel body (1).

8. The experimental system for measuring the dielectric constant of drilling fluid according to claim 1, characterized in that: The experimental system (100) for measuring the dielectric constant of drilling fluid also includes: a stirring mechanism (4), comprising a stirring member and a stirring driving member drivingly connected to the stirring member, wherein the stirring member is located in the reaction chamber; and / or, The turning mechanism (5) comprises a turning rod and a turning driving member, wherein two ends of the turning rod are respectively connected to the reaction kettle body (1) and the turning driving member.

9. The experimental system for measuring the dielectric constant of drilling fluid according to claim 1, characterized in that: The experimental system (100) for measuring the dielectric constant of drilling fluid further comprises a vacuum pumping module (9) connected to the reaction chamber.

10. The experimental system for measuring the dielectric constant of drilling fluid according to claim 1, characterized in that: The experimental system (100) for measuring the dielectric constant of drilling fluid further comprises a cleaning module (10) connected to the reaction chamber.

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