Drilling fluid voltage measuring device

Abstract

The utility model provides a drilling fluid voltage measuring device which comprises a simulation unit used for simulating formation conditions for drilling fluid; the conventional unit is used for providing ground conventional conditions for the drilling fluid; the voltage tester is electrically connected with the simulation unit and can monitor the demulsification voltage of the drilling fluid under the simulated formation condition; and the voltage tester is electrically connected with the conventional unit and can monitor the demulsification voltage of the drilling fluid under the conventional ground condition. The device has the beneficial effects that the demulsification voltage of the drilling fluid under the simulated formation condition and the demulsification voltage of the drilling fluid under the ground conventional condition can be monitored at the same time, so that a contrast is formed, and the operation state of the voltage probe in the simulation unit can be monitored.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas drilling development, in particular to a drilling fluid voltage measuring device. Background Art

[0002] Drilling fluid is the fluid used for circulation during the drilling process. It can be divided into water-based drilling fluid and oil-based drilling fluid according to its type. Among them, oil-based drilling fluid is an emulsified mud composed of water, oil, clay and oil-soluble chemical treatment agents. During the operation, the emulsified mud may be affected by the formation and may have problems such as water invasion or overflow, causing the oil-water ratio of the drilling fluid to change, which is further reflected in the change of demulsification voltage.

[0003] The demulsification voltage is the voltage when the emulsified mud begins to break, also known as electrical stability. It is an important indicator of the stability of the performance of oil-based drilling fluids and needs to be accurately monitored during the construction process. At present, the common means of monitoring the demulsification voltage is to use corresponding equipment in the circulating mud pool on the surface to monitor the change of the demulsification voltage. In order to simulate the actual demulsification voltage of the emulsified mud under high temperature and high pressure conditions in the formation, the monitoring equipment can often provide heating and pressurization functions; and the current monitoring equipment mostly uses polytetrafluoroethylene materials as test probes. After long-term operation under high temperature and high pressure conditions, such materials may soften and deform, which will affect the accuracy of the results, making it difficult for existing monitoring equipment to obtain accurate demulsification voltage test results after long-term operation under high temperature and high pressure conditions.

[0004] Therefore, it is necessary to study a drilling fluid voltage measuring device to solve the above problems or alleviate the impact of the above problems. Utility Model Content

[0005] The utility model provides a drilling fluid voltage measuring device, which is connected to a simulation unit and a conventional unit respectively through a voltage tester, and can simultaneously monitor the demulsification voltage of the drilling fluid under simulated formation conditions and the demulsification voltage under conventional ground conditions, thereby forming a comparison, and further being able to monitor the operating state of the voltage probe in the simulation unit.

[0006] The drilling fluid voltage measuring device of the utility model may include:

[0007] a simulation unit for simulating formation conditions for the drilling fluid;

[0008] A conventional unit, which is used to provide conventional surface conditions for the drilling fluid;

[0009] A voltage tester, the voltage tester is electrically connected to the simulation unit and can monitor the demulsification voltage of the drilling fluid under simulated formation conditions; the voltage tester is electrically connected to the conventional unit and can monitor the demulsification voltage of the drilling fluid under conventional ground conditions.

[0010] In one embodiment, the simulation unit includes a first tube pump, a simulation tube and a first outlet valve connected in sequence, the simulation tube is a sealed hollow tube body, the first tube pump is used to inject drilling fluid into the simulation tube, and the first outlet valve can adjust the pressure in the simulation tube by controlling the valve opening.

[0011] In one embodiment, a temperature-raising layer is provided on the surface of the simulated tube, and the temperature-raising layer is used to heat the drilling fluid in the simulated tube.

[0012] In one embodiment, a first mounting groove is provided on the simulation tube, a first voltage probe is detachably provided in the first mounting groove, and the first voltage probe is electrically connected to the voltage tester to monitor the demulsification voltage of the drilling fluid in the simulation tube.

[0013] In one embodiment, the conventional unit includes a second tube pump, a conventional tube and a second outlet valve connected in sequence, the conventional tube is a sealed hollow tube body, the second tube pump is used to inject drilling fluid into the conventional tube, and the second outlet valve can adjust the pressure in the conventional tube by controlling the valve opening.

[0014] In one embodiment, a constant temperature layer is provided on the surface of the conventional pipe, and the constant temperature layer is used to maintain the drilling fluid in the conventional pipe at a constant temperature.

[0015] In one embodiment, a second mounting groove is provided on the conventional pipe, a second voltage probe is detachably provided in the second mounting groove, and the second voltage probe is electrically connected to the voltage tester to monitor the demulsification voltage of the drilling fluid in the conventional pipe.

[0016] In one embodiment, the measuring device further comprises a semiconductor temperature controller, which is respectively connected to the temperature rising layer of the simulation unit and the constant temperature layer of the conventional unit, and can control the temperature of the temperature rising layer and the constant temperature layer.

[0017] In one embodiment, the measuring device also includes a gas source, which is connected to the simulation tube of the simulation unit and the conventional tube of the conventional unit respectively using a multi-way valve. The gas source can respectively introduce gas into the simulation tube and the conventional tube to adjust the pressure in the tube.

[0018] In one embodiment, the measuring device is skid-mounted, and the simulation unit, the conventional unit and the voltage tester are integrally arranged on a skid-mounted base.

[0019] The drilling fluid voltage measuring device provided by the utility model has at least the following beneficial effects compared with the prior art:

[0020] The drilling fluid voltage measuring device of the utility model is electrically connected to the simulation unit through a voltage tester, and can monitor the demulsification voltage of the drilling fluid under simulated formation conditions. At the same time, it is electrically connected to the conventional unit through the voltage tester, and can monitor the demulsification voltage of the drilling fluid under conventional ground conditions. This forms a comparison, and then can monitor the operating status of the voltage probe in the simulation unit, which is convenient for timely detection of deformation of the voltage probe in the simulation unit and timely replacement to ensure the accuracy of the measurement result. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0022] Figure 1 The figure is a structural schematic diagram of a drilling fluid voltage measuring device according to an embodiment of the utility model.

[0023] In the drawings, the same reference numerals are used for the same components. The drawings are not drawn to scale.

[0024] Reference numerals:

[0025] 1-simulation tube, 2-temperature rising layer, 3-first installation slot, 4-first voltage probe, 5-first outlet valve, 6-first tube pump, 7-conventional tube, 8-constant temperature layer, 9-second installation slot, 10-second voltage probe, 11-second outlet valve, 12-second tube pump, 13-semiconductor temperature controller, 14-voltage tester, 15-skid-mounted base, 16-first pressure gauge, 17-second pressure gauge, 18-gas source. DETAILED DESCRIPTION

[0026] The utility model will be further described below in conjunction with the accompanying drawings.

[0027] Example 1

[0028] like Figure 1 As shown, the drilling fluid voltage measuring device of the utility model may include:

[0029] a simulation unit for simulating formation conditions for the drilling fluid;

[0030] A conventional unit, which is used to provide conventional surface conditions for the drilling fluid;

[0031] The voltage tester 14 is electrically connected to the simulation unit and can monitor the demulsification voltage of the drilling fluid under simulated formation conditions; the voltage tester 14 is electrically connected to the conventional unit and can monitor the demulsification voltage of the drilling fluid under conventional ground conditions.

[0032] Specifically, the simulation unit simulates a high temperature and high pressure formation environment, so that the drilling fluid is in a high temperature and high pressure state; the conventional unit provides a ground environment with constant temperature and pressure for the drilling fluid, so that the drilling fluid is in a constant state of normal temperature and pressure; the voltage tester 14 can be electrically connected to the voltage probes provided in the simulation unit and the conventional unit to measure the demulsification voltage of the drilling fluid. It should be noted that the drilling fluid is an oil-based drilling fluid.

[0033] In this way, the drilling fluid voltage measuring device is electrically connected to the simulation unit through the voltage tester 14, and can monitor the demulsification voltage of the drilling fluid under simulated formation conditions. At the same time, it is electrically connected to the conventional unit through the voltage tester 14, and can monitor the demulsification voltage of the drilling fluid under conventional ground conditions. This forms a comparison, and then the operating status of the voltage probe in the simulation unit can be monitored, which is convenient for timely detection of deformation of the voltage probe in the simulation unit and timely replacement to ensure the accuracy of the measurement results.

[0034] like Figure 1 As shown, in one example, the simulation unit includes a first tube pump 6, a simulation tube 1 and a first outlet valve 5 connected in sequence, the simulation tube 1 is a sealed hollow tube body, the first tube pump 6 is used to inject drilling fluid into the simulation tube 1, and the first outlet valve 5 can adjust the pressure in the simulation tube 1 by controlling the valve opening.

[0035] Specifically, the simulation tube 1 is a closed hollow tube body, which is used to accommodate the drilling fluid returned to the ground. The simulation tube 1 is connected to the front and rear of the first outlet valve 5 and the first tube pump 6 connected to the inside thereof. The inlet of the first tube pump 6 can be connected to the drilling fluid pipeline. When in use, the inlet of the first tube pump 6 is connected to the source of the drilling fluid (such as a mud pool) through the drilling fluid pipeline, and the outlet of the first tube pump 6 is connected to the inlet end of the simulation tube 1, so as to inject drilling fluid into the simulation tube 1. The first outlet valve 5 is connected to the outlet end of the simulation tube 1. The first outlet valve 5 can adjust the internal pressure of the simulation tube 1 by controlling the valve opening, so that the drilling fluid inside the simulation tube 1 can be in a high-pressure state to simulate the pressure conditions of the formation environment.

[0036] Furthermore, a first pressure gauge 16 is provided on the pipeline between the simulation tube 1 and the first outlet valve 5 to reflect the pressure condition of the simulation unit, so as to facilitate controlling the pressure in the simulation tube 1 to be maintained within a desired pressure range.

[0037] In one example, a temperature-raising layer 2 is provided on the surface of the simulated pipe 1 , and the temperature-raising layer 2 is used to heat the drilling fluid in the simulated pipe 1 .

[0038] Specifically, the heating layer 2 is wrapped around the outer surface of the simulated tube 1, and can heat the simulated tube 1. The simulated tube 1 heats the drilling fluid in the tube through heat transfer, so that the drilling fluid inside the simulated tube 1 is in a high temperature state to simulate the temperature conditions of the formation environment.

[0039] In this way, the simulation unit can simulate the high-pressure state of the formation environment in the simulation tube 1 through the cooperation of the first outlet valve 5 and the first tube pump 6, and can simulate the high-temperature state of the formation environment in the simulation tube 1 through the heating layer 2. Since the drilling fluid is under high-temperature and high-pressure conditions in the formation, such high-temperature and high-pressure conditions are simulated by the simulation unit, and then the voltage data of the drilling fluid in the simulation tube 1 is measured using a voltage probe. This voltage data is more accurate than the data obtained by directly measuring the drilling fluid using ground conditions.

[0040] In one example, a first mounting groove 3 is provided on the simulation pipe 1 , a first voltage probe 4 is detachably provided in the first mounting groove 3 , and the first voltage probe 4 is electrically connected to a voltage tester 14 to monitor the demulsification voltage of the drilling fluid in the simulation pipe 1 .

[0041] Specifically, one end of the first voltage probe 4 is electrically connected to the voltage tester 14 , and the other end extends into the simulation tube 1 to contact the drilling fluid, so as to measure the demulsification voltage of the drilling fluid.

[0042] Furthermore, the connection between the first voltage probe 4 and the first mounting groove 3 can be a threaded connection, and the outer side of the first voltage probe 4 and the inner side of the first mounting groove 3 are provided with mutually matching threads. When the first voltage probe 4 needs to be replaced, the old probe can be directly screwed out and the new probe can be screwed in. The replacement operation is simple and quick. In this way, the first voltage probe 4 of the simulation tube 1 is detachably arranged in the first mounting groove 3, which is convenient for replacement, thereby effectively ensuring the long-term testing effect of the first voltage probe 4 for drilling fluid (emulsified mud) under high temperature and high pressure conditions.

[0043] like Figure 1 As shown, in one example, the conventional unit includes a second tube pump 12, a conventional tube 7 and a second outlet valve 11 connected in sequence, the conventional tube 7 is a sealed hollow tube body, the second tube pump 12 is used to inject drilling fluid into the conventional tube 7, and the second outlet valve 11 can adjust the pressure in the conventional tube 7 by controlling the valve opening.

[0044] Specifically, the conventional pipe 7 is also a closed hollow pipe body, which is used to accommodate the drilling fluid returned to the ground. The conventional pipe 7 is connected to the front and rear of the second outlet valve 11 and the second pipe pump 12. The inlet of the second pipe pump 12 can be connected to the drilling fluid pipeline. When in use, the inlet of the second pipe pump 12 is connected to the source of the drilling fluid (such as a mud pool) through the drilling fluid pipeline, and the outlet of the second pipe pump 12 is connected to the inlet end of the conventional pipe 7, so as to inject drilling fluid into the conventional pipe 7. The second outlet valve 11 is connected to the outlet end of the conventional pipe 7. The second outlet valve 11 can control the pressure in the conventional pipe 7 by controlling the valve opening, so that the drilling fluid inside the conventional pipe 7 can be maintained at a normal pressure state.

[0045] Furthermore, a second pressure gauge 17 is provided on the pipeline between the conventional pipe 7 and the second outlet valve 11 to reflect the pressure condition of the conventional unit, so as to control the pressure in the conventional pipe 7 to be within a desired pressure range.

[0046] In one example, a constant temperature layer 8 is provided on the surface of the conventional pipe 7, and the constant temperature layer 8 is used to maintain the drilling fluid in the conventional pipe 7 at a constant temperature.

[0047] Specifically, the isothermal layer 8 is wrapped around the outer surface of the conventional pipe 7 and can transfer heat with the conventional pipe 7, and the conventional pipe 7 can transfer heat with the drilling fluid inside the pipe, so that the drilling fluid inside the conventional pipe 7 can be maintained at room temperature.

[0048] In this way, the conventional unit can maintain the conventional pipe 7 at a normal pressure state through the cooperation of the second outlet valve 11 and the second pipe pump 12, and can maintain the conventional pipe 7 at a normal temperature state through the constant temperature layer 8. The drilling fluid is kept at a constant normal temperature and pressure condition through the conventional unit, and then the voltage probe is used to measure the voltage data of the drilling fluid in the conventional pipe 7 as a control group for comparison with the voltage data measured by the simulation unit, thereby determining the operating status of the voltage probe in the simulation unit, so that the simulation unit can replace the voltage probe in time to ensure the accuracy of the measurement result.

[0049] In one example, a second mounting groove 9 is provided on the conventional pipe 7 , a second voltage probe 10 is detachably provided in the second mounting groove 9 , and the second voltage probe 10 is electrically connected to a voltage tester 14 to monitor the demulsification voltage of the drilling fluid in the conventional pipe 7 .

[0050] Specifically, one end of the second voltage probe 10 is electrically connected to the voltage tester 14 , and the other end extends into the conventional pipe 7 to contact the drilling fluid, so as to measure the demulsification voltage of the drilling fluid.

[0051] Furthermore, the second voltage probe 10 and the second mounting groove 9 can also be connected in a threaded manner, and the outer side of the second voltage probe 10 and the inner side of the second mounting groove 9 are provided with mutually matching threads. When the second voltage probe 10 needs to be replaced, the old probe can be directly screwed out and the new probe can be screwed in, and the replacement operation is simple and quick.

[0052] It should be noted that the difference between the conventional unit and the simulation unit is that the conventional unit measures the pressure and temperature conditions of the drilling fluid at room temperature and pressure. Since the drilling fluid still has a certain temperature after being extracted from the ground, the constant temperature layer 8 can adjust its temperature to a constant room temperature. At room temperature, the second voltage probe 10 will not be deformed by heat, and the change in the measured voltage value is only affected by the change in the drilling fluid itself, that is, it can correctly reflect the electrical stability of the drilling fluid. Based on this, the measurement device sets the conventional unit and the simulation unit together, that is, the drilling fluid is injected into the conventional pipe 7 and the simulation pipe 1 at the same time, so that the drilling fluid is kept at room temperature and pressure conditions and high temperature and high pressure conditions for voltage measurement, respectively, to form a comparison. In this way, when the voltage value measured in the conventional tube 7 is stable and the voltage value in the analog tube 1 changes significantly, it can be considered that the high temperature and high pressure conditions cause the first voltage probe 4 in the analog tube 1 to deform and cause data distortion, that is, it can remind the construction personnel to replace the new first voltage probe 4 in time; and when the voltage value measured in the conventional tube 7 and the voltage value in the analog tube 1 change at the same time and the change trends are similar, it can be considered that the demulsification voltage of the drilling fluid itself has changed. At this time, the voltage value in the analog tube 1 can be determined to be the accurate demulsification voltage value, and the data at this time can be recorded to guide the subsequent disposal of the drilling fluid.

[0053] In an example, Figure 1 As shown, the measuring device further includes a semiconductor temperature controller 13 , which is respectively connected to the temperature rising layer 2 of the simulation unit and the constant temperature layer 8 of the conventional unit. The semiconductor temperature controller 13 can control the temperatures of the temperature rising layer 2 and the constant temperature layer 8 .

[0054] Specifically, the semiconductor temperature controller 13 is arranged outside the simulation tube 1 and the conventional tube 7, and is electrically connected to the temperature-raising layer 2 and the constant temperature layer 8, respectively, and can control the temperature change of the temperature-raising layer 2 and the constant temperature layer 8. The semiconductor temperature controller 13 can quickly control the temperature increase and decrease to meet the temperature increase and / or temperature decrease conditions required by the simulation unit and the conventional unit. The temperature control method of the semiconductor temperature controller 13 is to arrange the heating or cooling plate on the inner surface of the temperature-raising layer 2 and the constant temperature layer 8 composed of the heat insulation material.

[0055] It should be noted that the voltage tester 14 is also arranged outside the analog tube 1 and the conventional tube 7, and is electrically connected to the first voltage probe 4 and the second voltage probe 10, respectively, and can obtain the voltage signals inside the analog tube 1 and the conventional tube 7 by controlling the first voltage probe 4 and the second voltage probe 10, respectively. When the probe needs to be replaced, the original probe on the first installation slot 3 or the second installation slot 9 can be replaced by a brand new first voltage probe 4 or a brand new second voltage probe 10 connected to the voltage tester 14. In addition, the voltage tester 14 can introduce the continuous automatic measurement control system used in the prior art, so as to perform continuous intermittent measurement on the analog tube 1 and the conventional tube 7, that is, automatically collect the voltage signal inside the tube once every period of time.

[0056] In an example, Figure 1 As shown, the measuring device also includes a gas source 18, which is connected to the simulation tube 1 of the simulation unit and the conventional tube 7 of the conventional unit respectively using a multi-way valve (not shown in the drawings). The gas source 18 can respectively introduce gas into the simulation tube 1 and the conventional tube 7 to adjust the pressure inside the tube.

[0057] Specifically, the simulated tube 1 and the conventional tube 7 are provided with gas sources 18 connected to the pipelines of the two tubes respectively. The gas source 18 can be connected to the two tubes respectively by means of a multi-way valve, and the flow rate is controlled by a switch with a pressure gauge, so as to inject inert gas (such as nitrogen) into the simulated tube 1 and the conventional tube 7 to change the pressure inside the simulated tube 1 and the conventional tube 7, and cooperate with the first outlet valve 5 and the second outlet valve 11 to ensure the pressure conditions required by the simulated unit and the conventional unit. In this way, in conjunction with the temperature control of the semiconductor temperature controller 13, the pressure and temperature inside the simulated tube 1 and the conventional tube 7 can be adjusted, so that the measuring device can be used to measure the demulsification voltage under different conditions, expanding the application range of the measuring device. Based on this, the drilling fluid voltage measuring device can be used to measure the demulsification voltage of the drilling fluid under different high temperature and high pressure conditions, and can also realize the monitoring and early warning of the change of the drilling fluid performance.

[0058] In one example, the measuring device is skid-mounted, and the analog unit, the conventional unit, and the voltage tester 14 are integrated on a skid-mounted base 15 .

[0059] Specifically, the simulation tube 1, the conventional tube 7, the semiconductor temperature controller 13, the voltage tester 14, and the gas source 18 can be integrated on the skid-mounted base 15. The skid-mounted base 15 is provided with a convenient transport device, and the skid-mounted base 15 can also adopt a structure with wheels to further facilitate transport.

[0060] In one example, the simulated tube 1 is detachably connected to the pipeline, and the first mounting groove 3 is detachably arranged on the simulated tube 1; the conventional tube 7 is detachably connected to the pipeline, and the second mounting groove 9 is detachably arranged on the conventional tube 7. In this way, the pipelines connected to the simulated tube 1 and the conventional tube 7 can be removed, and the first mounting groove 3 and the second mounting groove 9 can also be removed. At the same time, the simulated tube 1 and the conventional tube 7 themselves can also be designed as a detachable structure with a movable cover. Since the oil-based drilling fluid often exists in the form of mud and has the problem of viscosity, it is necessary to clean and maintain the devices that are in contact with it for a long time. The use of a detachable structure can effectively ensure the cleaning effect of the simulated tube 1 and the conventional tube 7.

[0061] Example 2

[0062] The drilling fluid voltage measurement method of the utility model can be operated using the drilling fluid voltage measurement device in Example 1, and can simultaneously monitor the demulsification voltage of the drilling fluid under simulated formation conditions and the demulsification voltage under conventional ground conditions, thereby forming a comparison, and further being able to monitor the operating status of the first voltage probe in the simulation unit.

[0063] Specifically, the drilling fluid voltage measurement method uses a drilling fluid voltage measuring device to simultaneously monitor the demulsification voltage of the drilling fluid under high temperature and high pressure conditions in the simulation unit and the drilling fluid under normal temperature and pressure conditions in the conventional unit, so that the voltage data monitored by the two form a control group, thereby being able to monitor the operating status of the voltage probe under high temperature and high pressure conditions, making it easy to promptly detect deformation of the voltage probe under high temperature and high pressure conditions and to replace it in time, thereby ensuring the accuracy of the results of long-term measurement of the demulsification voltage of the drilling fluid.

[0064] In one example, a drilling fluid voltage measurement method includes determining an operating state of a first voltage probe in a monitoring simulation unit;

[0065] When the voltage value in the conventional unit and the voltage value in the analog unit change simultaneously and the change trends are similar, it is determined that the operation state of the first voltage probe in the analog unit is good;

[0066] When the voltage value in the conventional unit is stable and the voltage value in the analog unit changes significantly, it is determined that the first voltage probe in the analog unit is deformed.

[0067] Specifically, when the voltage values ​​measured by the conventional unit and the voltage values ​​measured by the analog unit change at the same time and the change trends are similar, it can be determined that the demulsification voltage of the drilling fluid itself has changed. At this time, the voltage value measured by the analog unit can be used as the accurate demulsification voltage value, and the data at this time can be recorded to guide the subsequent disposal of the drilling fluid. When the voltage value measured by the conventional unit is stable and the voltage value measured by the analog unit changes significantly, it can be considered that the first voltage probe of the analog unit is deformed due to high temperature and high pressure conditions, resulting in data distortion, that is, it can remind construction personnel to replace the new first voltage probe in time to ensure the accuracy of the measurement structure.

[0068] In order to better understand the above embodiment, the method of using the drilling fluid voltage measuring device for measurement will be further described below in conjunction with the accompanying drawings.

[0069] When in use, the measuring device is moved as a whole to the vicinity of the drilling fluid source (such as a mud pool) that is returned to the ground, and the inlets of the first tube pump 6 and the second tube pump 12 are immersed in the drilling fluid respectively, and the first outlet valve 5 and the second outlet valve 11 are connected to the circulation pipeline; then the simulated tube 1 is heated and pressurized to the same as the formation conditions, and the temperature and pressure of the conventional tube 7 are adjusted and controlled to the same as the conventional conditions on the ground at normal temperature and pressure. At the same time, a voltage tester 14 measures the voltage change of the drilling fluid in the two pipelines through a voltage probe until it is stable, and reads the voltage data in the simulated tube 1 as the demulsification voltage data. After recording the data for a period of time, observe the voltage change trend of the two pipelines. If the voltages in the simulated tube 1 and the conventional tube 7 change at the same time and the degree of change is similar, the voltage data in the simulated tube 1 is recorded as the reading; if only the voltage data in the simulated tube 1 changes, while the voltage data in the conventional tube 7 remains unchanged, it is considered that the voltage data in the simulated tube 1 is distorted due to the deformation of the voltage probe. At this time, the voltage probe in the simulated tube 1 needs to be replaced before continuing the measurement.

[0070] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. 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. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A drilling fluid voltage measuring device, characterized in that: The measuring device comprises: a simulation unit for simulating formation conditions for the drilling fluid; A conventional unit, which is used to provide conventional surface conditions for the drilling fluid; A voltage tester, the voltage tester is electrically connected to the simulation unit and can monitor the demulsification voltage of the drilling fluid under simulated formation conditions; the voltage tester is electrically connected to the conventional unit and can monitor the demulsification voltage of the drilling fluid under conventional ground conditions.

2. The drilling fluid voltage measuring device according to claim 1, characterized in that: The simulation unit includes a first tube pump, a simulation tube and a first outlet valve connected in sequence. The simulation tube is a sealed hollow tube body. The first tube pump is used to inject drilling fluid into the simulation tube. The first outlet valve can adjust the pressure in the simulation tube by controlling the valve opening.

3. The drilling fluid voltage measuring device according to claim 2, characterized in that: A temperature-raising layer is provided on the surface of the simulation tube, and the temperature-raising layer is used to heat the drilling fluid in the simulation tube.

4. The drilling fluid voltage measuring device according to claim 2, characterized in that: The simulation tube is provided with a first installation groove, in which a first voltage probe is detachably provided, and the first voltage probe is electrically connected to the voltage tester to monitor the demulsification voltage of the drilling fluid in the simulation tube.

5. The drilling fluid voltage measuring device according to claim 1, characterized in that: The conventional unit comprises a second tube pump, a conventional tube and a second outlet valve which are connected in sequence. The conventional tube is a sealed hollow tube body. The second tube pump is used to inject drilling fluid into the conventional tube. The second outlet valve can adjust the pressure in the conventional tube by controlling the valve opening.

6. The drilling fluid voltage measuring device according to claim 5, characterized in that: The surface of the conventional pipe is sheathed with a constant temperature layer, and the constant temperature layer is used to maintain the drilling fluid in the conventional pipe at a constant temperature.

7. The drilling fluid voltage measuring device according to claim 5, characterized in that: The conventional pipe is provided with a second mounting groove, in which a second voltage probe is detachably provided, and the second voltage probe is electrically connected to the voltage tester to monitor the demulsification voltage of the drilling fluid in the conventional pipe.

8. The drilling fluid voltage measuring device according to claim 1, characterized in that: The measuring device further comprises a semiconductor temperature controller, which is respectively connected to the temperature rising layer of the simulation unit and the constant temperature layer of the conventional unit, and the semiconductor temperature controller can control the temperature of the temperature rising layer and the constant temperature layer.

9. The drilling fluid voltage measuring device according to claim 1, characterized in that: The measuring device also includes a gas source, which is connected to the simulation tube of the simulation unit and the conventional tube of the conventional unit respectively through a multi-way valve. The gas source can respectively introduce gas into the simulation tube and the conventional tube to adjust the pressure in the tube.

10. The drilling fluid voltage measuring device according to claim 1, characterized in that: The measuring device is skid-mounted, and the simulation unit, the conventional unit and the voltage tester are integrated on a skid-mounted base.

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