Oil-water mixed solution treatment method and device and computer equipment

Abstract

The invention relates to the technical field of oil-gas exploration, in particular to an oil-water mixed liquid treatment method and device and computer equipment. The method comprises the following steps: obtaining a first oil-water mixed solution according to in-situ crude oil and first formation water; detecting first interfacial tension between oil and water in the first oil-water mixed liquid; electrolyzing the first oil-water mixed solution by utilizing a direct-current electric field; detecting a second interfacial tension between oil and water in the electrolyzed first oil-water mixed solution; and analyzing the influence of electrolysis on the interfacial tension between oil and water according to the first interfacial tension and the second interfacial tension. The embodiment of the invention can analyze the influence of the direct-current electric field on the oil-water interfacial tension.

Description

Technical Field

[0001] The present invention relates to the field of oil and gas exploration technology, and in particular to a method, device and computer equipment for processing oil-water mixture. Background Art

[0002] In recent years, the development of oil and gas resources has gradually moved towards unconventional energy, especially in the field of tight oil development. However, the development of unconventional energy such as tight oil is very different from conventional energy development. Tight oil is characterized by rapid decline in single well production, difficulty in stabilizing production, and low recovery rate, and has been in an inefficient state for a long time. At present, the method of exploitation for tight oil needs to rely on well network densification and repeated fracturing, and the investment cost is too high. Improving the economic benefits of tight oil resources requires the development and breakthrough of methods and theories to improve recovery. In other words, how to improve recovery is one of the main problems currently faced.

[0003] In recent years, electric flooding technology has been successfully deployed and implemented in oil fields as a new type of enhanced oil recovery technology. The characteristics demonstrated by field applications are enhanced oil flow, enhanced water injection capacity, unblocked formations, and increased oil production rates. However, the current understanding of electric flooding technology is still unclear. Therefore, it is necessary to study the effect of electric field on oil-water mixture. Summary of the invention

[0004] The embodiments of this specification provide a method, device and computer equipment for processing an oil-water mixture, which are used to analyze the influence of a direct current electric field on the oil-water interfacial tension.

[0005] The embodiment of this specification provides a method for treating an oil-water mixture, comprising:

[0006] Obtaining a first oil-water mixed liquid based on the formation crude oil and the first formation water;

[0007] detecting a first interfacial tension between oil and water in a first oil-water mixture;

[0008] electrolyzing the first oil-water mixture by using a direct current electric field;

[0009] detecting a second interfacial tension between oil and water in the first oil-water mixture after electrolysis;

[0010] Based on the first interfacial tension and the second interfacial tension, the effect of electrolysis on the interfacial tension between oil and water is analyzed.

[0011] The embodiment of this specification also provides an oil-water mixed liquid processing device, comprising:

[0012] An acquisition unit, used for acquiring a first oil-water mixed liquid according to the formation crude oil and the first formation water;

[0013] A first detection unit, used to detect a first interfacial tension between oil and water in a first oil-water mixture;

[0014] An electrolysis unit, used for electrolyzing the first oil-water mixture by using a direct current electric field;

[0015] A second detection unit, used for detecting a second interfacial tension between oil and water in the first oil-water mixture after electrolysis;

[0016] The risk unit is used to analyze the effect of electrolysis on the interfacial tension between oil and water based on the first interfacial tension and the second interfacial tension.

[0017] The embodiments of the present specification also provide a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned oil-water mixture processing method when executing the computer program.

[0018] The embodiments of the present specification also provide a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the above-mentioned oil-water mixture treatment method is implemented.

[0019] The embodiments of the present specification also provide a computer program product, which includes a computer program. When the computer program is executed by a processor, the above-mentioned oil-water mixture treatment method is implemented.

[0020] The technical scheme of the embodiment of this specification can obtain a first oil-water mixture according to the formation crude oil and the first formation water; can detect the first interfacial tension between oil and water in the first oil-water mixture; can use a direct current electric field to electrolyze the first oil-water mixture; can detect the second interfacial tension between oil and water in the first oil-water mixture after electrolysis; can analyze the effect of electrolysis on the interfacial tension between oil and water according to the first interfacial tension and the second interfacial tension. The embodiment of this specification can analyze the effect of the direct current electric field on the oil-water interfacial tension. The direct current electric field can reduce the interfacial tension between crude oil and formation water. In addition, the formation crude oil is treated by applying a direct current electric field and by means of the conductive properties of the formation water, and the formation water is electrolyzed by a direct current electric field to increase the pH value of the solution, react with the acidic substances in the crude oil, promote the increase of the carboxylate component, and promote the adsorption of carboxylates and natural active substances at the interface, thereby reducing the oil-water interfacial tension. The method of this specification is simple, low-cost, less damaging to the formation, and the screening time of indoor experimental schemes and experimental conditions is greatly reduced, which can better reduce the interfacial tension between crude oil and formation water. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of this specification 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. The drawings described below are only some embodiments recorded in this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 This is a schematic diagram of the structure of the electrolysis device in the embodiment of this specification;

[0023] Figure 2 This is a schematic diagram of the structure of a closed reaction container in the embodiments of this specification;

[0024] Figure 3 This is a schematic diagram of the process of treating an oil-water mixture in an embodiment of this specification;

[0025] Figure 4 This is a schematic diagram of the process of treating an oil-water mixture in an embodiment of this specification;

[0026] Figure 5 This is a schematic diagram of the structure of the oil-water mixture treatment device in the embodiment of this specification;

[0027] Figure 6a This is a schematic diagram of the change curve of interfacial tension and pH value in the embodiments of this specification;

[0028] Figure 6b This is a schematic diagram of the change curve of interfacial tension and pH value in the embodiments of this specification;

[0029] Figure 6c This is a schematic diagram of the change curve of interfacial tension and pH value in the embodiments of this specification;

[0030] Figure 6d This is a schematic diagram of the change curve of interfacial tension and pH value in the embodiments of this specification;

[0031] Figure 7 A comparative schematic diagram of natural active substances in the examples of this specification;

[0032] Figure 8 Schematic diagram of comparison of carboxylate functional groups in the examples of this specification. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, rather than all of the embodiments. The specific embodiments described herein are only used to explain the present disclosure, rather than to limit the present disclosure. Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art are within the scope of protection of the present disclosure. In addition, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0034] See also Figure 1 and Figure 2 . An embodiment of the present specification provides an electrolysis device. The electrolysis device is used to analyze the influence of a direct current electric field on oil-water properties, such as the influence on oil-water interfacial tension, the influence on crude oil components, the influence on formation water pH, the influence on formation water salinity, etc. The electrolysis device may include any number of a crude oil container 11, a water container 12, a closed reaction container 13, a first electrode 14, a second electrode 15, a pump 16, a first multi-way valve 17, a second multi-way valve 18, a power supply 19, a bellows, a gas container 21, a temperature sensor 22, a pressure sensor 23, a third electrode 24, and a computer device 20.

[0035] In some embodiments, the crude oil container 11 is used to contain formation crude oil. The water container 12 is used to contain formation water. The crude oil in the crude oil container 11 can be injected into the closed reaction container 13. The formation water in the water container 12 can also be injected into the closed reaction container 13.

[0036] The injected formation crude oil and formation water can form an oil-water mixture in the closed reaction container 13 .

[0037] In some embodiments, the closed reaction container 13 is used to contain an oil-water mixture. The first electrode 14 and the second electrode 15 may be disposed on the closed reaction container 13. The first electrode 14 and the second electrode 15 are used to pass direct current into the oil-water mixture in the closed reaction container 13, so as to electrolyze the oil-water mixture using a direct current electric field formed by the direct current.

[0038] The closed reaction container 13 can ensure the airtightness of the oil-water mixture during the electrochemical reaction, and prevent the crude oil components and the generated gas from volatilizing during the electrolysis process, thereby affecting the test results. In addition, the closed reaction container 13 can better ensure that the gasified components are cooled to room temperature after the electrolysis is completed, and liquefied into the oil phase under room temperature conditions, thereby minimizing component losses.

[0039] In some embodiments, the pump 16 can pump the formation crude oil in the crude oil container 11 and the formation water in the water container 12 into the closed reaction container 13. Specifically, the pump 16 can be connected to the first multi-way valve 17 through a pipeline. The first multi-way valve 17 can be connected to the crude oil container 11 and the water container 12 through a pipeline. The crude oil container 11 and the water container 12 can be connected to the second multi-way valve 18 through a pipeline. The second multi-way valve 18 can be connected to the closed reaction container 13 through a pipeline.

[0040] The computer device 20 can control the first multi-way valve 17 to open the connection channel between the pump 16 and the crude oil container 11; can control the first multi-way valve 17 to close the connection channel between the pump 16 and the water container 12; can control the second multi-way valve 18 to open the connection channel between the crude oil container 11 and the closed reaction container 13; can control the second multi-way valve 18 to close the connection channel between the water container 12 and the closed reaction container 13. In this way, the pump 16 can drive the formation crude oil in the crude oil container 11 to enter the closed reaction container 13 through the pipeline and the second multi-way valve 18.

[0041] For example, a piston may be provided at the bottom of the crude oil container 11. Formation crude oil may be filled between the top of the crude oil container 11 and the piston. The pump 16 may drive the piston in the crude oil container 11 to move toward the top, thereby pumping the formation crude oil into the closed reaction container 13.

[0042] The computer device 20 can control the first multi-way valve 17 to open the connection channel between the pump 16 and the water container 12; the first multi-way valve 17 can be controlled to close the connection channel between the pump 16 and the crude oil container 11; the second multi-way valve 18 can be controlled to open the connection channel between the water container 12 and the closed reaction container 13; the second multi-way valve 18 can be controlled to close the connection channel between the crude oil container 11 and the closed reaction container 13. In this way, the pump 16 can drive the formation water in the water container 12 to enter the closed reaction container 13 through the pipeline and the second multi-way valve 18.

[0043] For example, a piston may be provided at the bottom of the water container 12. Formation water may be filled between the top of the water container 12 and the piston. The pump 16 may drive the piston in the water container 12 to move toward the top, thereby pumping the formation water into the closed reaction container 13.

[0044] In some embodiments, the closed reaction vessel 13 may be located inside a bellows. The bellows is used to heat the oil-water mixture in the closed reaction vessel 13. The gas container 21 is used to contain an inert gas. The inert gas in the gas container 21 may be injected into the closed reaction vessel 13. Through the bellows and the gas container 21, the oil-water mixture in the closed reaction vessel 13 can reach a set temperature and a set pressure, so that electrolysis can be performed at the set temperature and the set pressure. In this way, the high temperature and high pressure of the actual formation conditions can be truly simulated. The set temperature is used to simulate the formation temperature. The set pressure is used to simulate the formation pressure.

[0045] For example, the bellows can first heat the oil-water mixture in the closed reaction container 13 to heat the oil-water mixture to a set temperature. Then the gas container 21 can inject an inert gas into the closed reaction container to make the pressure of the oil-water mixture reach the set pressure. Then the first electrode 14 and the second electrode 15 can pass direct current into the oil-water mixture in the closed reaction container 13. In this way, the oil-water mixture can be electrolyzed using a direct current electric field under real formation conditions. Improve the accuracy of the test results.

[0046] In some embodiments, the first multi-way valve 17 can also be connected to the gas container 21 through a pipeline. The gas container 21 can be connected to the second multi-way valve 18 through a pipeline. The computer device 20 can control the first multi-way valve 17 to open the connection channel between the pump 16 and the gas container 21; the first multi-way valve 17 can be controlled to close the connection channel between the pump 16 and the water container 12, and the connection channel between the pump 16 and the crude oil container 11; the second multi-way valve 18 can be controlled to open the connection channel between the gas container 21 and the closed reaction container 13; the second multi-way valve 18 can be controlled to close the connection channel between the water container 12 and the closed reaction container 13, and the connection channel between the crude oil container 11 and the closed reaction container 13. In this way, the pump 16 can drive the inert gas in the gas container 21 to enter the closed reaction container 13 through the second multi-way valve 18.

[0047] For example, a piston may be provided at the bottom of the gas container 21. An inert gas may be filled between the top of the gas container 21 and the piston. The pump 16 may drive the piston in the gas container 21 to move toward the top, thereby pumping the inert gas into the closed reaction container 13.

[0048] In some embodiments, power source 19 may include a DC power source.

[0049] The power source 19 is electrically connected to the first electrode 14 and the second electrode 15 to supply direct current to the first electrode 14 and the second electrode 15 .

[0050] In some embodiments, the temperature sensor 22 may be disposed on the sealed reaction vessel 13. The pressure sensor 23 may be disposed on a pipeline connected to the sealed reaction vessel 13.

[0051] During the electrolysis of the oil-water mixture, under the action of the DC electric field, the alkaline substances in the formation water react with the acidic substances in the formation crude oil, generating Joule heat, causing the temperature to rise. The temperature rise causes the components with lower boiling points in the formation crude oil to vaporize, thereby causing the pressure to change. The temperature sensor 22 is used to measure the temperature of the oil-water mixture in the closed reaction container 13. The pressure sensor 23 is used to measure the pressure of the oil-water mixture in the closed reaction container 13.

[0052] In some embodiments, the third electrode 24 can be disposed on the sealed reaction vessel 13. The third electrode 24 can be used as a reference electrode to achieve online detection of the redox potential. The reference electrode is an electrode used as a reference to measure the potential difference relative to the research electrode. Under the action of the DC electric field, the ions in the oil-water mixture undergo redox reactions and electrolysis reactions, thereby causing the conductivity of the oil-water mixture to change. The third electrode 24 is used to detect the redox potential during the electrolysis process.

[0053] In some embodiments, a piston 134 is provided inside the closed reaction container 13. The piston 134 is used to discharge the oil-water mixture after electrolysis. For example, the first multi-way valve 17 can also be connected to the closed reaction container 13 through a pipeline. The computer device 20 can control the first multi-way valve 17 to open the connection channel between the pump 16 and the closed reaction container 13; the first multi-way valve 17 can be controlled to close the connection channel between the pump 16 and the water container 12, the connection channel between the pump 16 and the crude oil container 11, and the connection channel between the pump 16 and the gas container 21. The bottom of the closed reaction container 13 can be provided with a piston 134. The oil-water mixture can be filled between the top of the closed reaction container 13 and the piston 134. The pump 16 can drive the piston 134 in the closed reaction container 13 to move toward the top to discharge the oil-water mixture after electrolysis.

[0054] In some embodiments, the computer device 20 may include a desktop computer, a portable computer, etc. The computer device 20 may receive user instructions. According to the received user instructions, the computer device 20 may control the pump 16, the first multi-way valve 17, and the second multi-way valve 18 to input formation crude oil, formation water, and inert gas into the closed reaction container 13 and discharge the electrolyzed oil-water mixture in the closed reaction container.

[0055] In some embodiments, the computer device 20 may also be connected to a temperature sensor 22 and a pressure sensor 23 .

[0056] The computer device 20 may acquire the temperature detected by the temperature sensor 22 and the pressure detected by the pressure sensor 23 .

[0057] In some embodiments, the computer device 20 may also be connected to the third electrode 24 .

[0058] The computer device 20 can obtain the redox potential detected by the third electrode 24 .

[0059] In some embodiments, under the action of the DC electric field, the ions in the oil-water mixture undergo oxidation-reduction reaction and electrolysis reaction, thereby changing the conductivity of the oil-water mixture. The computer device 20 can also obtain the voltage and current between the first electrode 14 and the second electrode 15.

[0060] In some embodiments, the computer device 20 can also obtain the first interfacial tension between oil and water in the oil-water mixture before electrolysis, the first component of formation oil in the oil-water mixture before electrolysis, the first pH of formation water in the oil-water mixture before electrolysis, the second interfacial tension between oil and water in the oil-water mixture after electrolysis, the second component of the oil sample in the oil-water mixture after electrolysis, and the second pH of the water sample in the oil-water mixture after electrolysis; and can analyze the influence of the DC electric field on the properties of oil and water based on the first interfacial tension, the first component, the first pH, the second interfacial tension, the second component, and the second pH.

[0061] In some embodiments, the closed reaction container 13 includes a cylinder 131, an upper end cover 132, a lower end cover 133, a piston 134, a bracket 135, etc. The upper end cover 132, the cylinder 131 and the lower end cover 133 can form a closed cavity. The upper end cover 132 is provided with a first hole 1321, a second hole 1322, a third hole 1323, a fourth hole 1324 and a fifth hole 1325. The first hole 1321 is used for a pipeline to pass through. The pressure sensor 23 can be located on the pipeline. The pipeline can be connected to the second multi-way valve 18. Formation crude oil, formation water and inert gas can be input into the closed reaction container through the pipeline. The pipeline can also be connected to other containers. The oil-water mixture after electrolysis can also be discharged to other containers through the pipeline. The second hole 1322 is used for the temperature sensor 22 to pass through. The third hole 1323 is used for the first electrode 14 to pass through. The fifth hole 1325 is used for the second electrode 14 to pass through. The fourth hole 1324 is used for the third electrode 24 to pass through. Of course, holes for other pipelines to pass through may also be provided on the lower end cover 133. The other pipelines may be connected to the first multi-way valve 17. The electrolyzed oil-water mixture may be discharged through the other pipelines.

[0062] The electrolysis device of the embodiment of this specification can ensure the airtightness of the overall reaction, thereby realizing the analysis and research of oil-water properties under the action of a direct current electric field at high temperature and high pressure, and can also realize online monitoring of the dynamic changes of interfacial tension.

[0063] The electrolysis device of the embodiment of this specification can achieve insulation under high temperature and high pressure conditions, thereby ensuring experimental safety.

[0064] The electrolysis device of the embodiment of this specification can detect the changes of voltage, current, pressure and temperature during the electrolysis process in real time.

[0065] The electrolysis device of the embodiment of this specification can realize a sealed, high-voltage, insulated, and high-temperature experimental environment, and can detect changes in temperature, pressure, current, and voltage in real time, thereby better analyzing changes in oil and water properties under a DC electric field.

[0066] See also Figure 3 The embodiments of this specification also provide a method for treating an oil-water mixture.

[0067] The method may include the following steps.

[0068] Step 31: Inject the formation crude oil in the crude oil container into the closed reaction container.

[0069] Step 32: Inject the formation water in the water container into the closed reaction container.

[0070] Step 33: Direct current is supplied to the oil-water mixture formed by the formation crude oil and formation water in the closed reaction container through the first electrode and the second electrode arranged on the closed reaction container, so as to electrolyze the oil-water mixture by utilizing the direct current electric field formed by the direct current.

[0071] In some embodiments, formation crude oil can be collected; the collected formation crude oil can be pre-treated by dehydration, degassing, impurity removal, etc.; the pre-treated formation crude oil can be loaded into a crude oil container. The formation crude oil in the crude oil container can include dense crude oil, etc. A certain concentration of salt water can be prepared to simulate formation water; the prepared salt water can be loaded into a water container.

[0072] In some embodiments, the closed reaction vessel may be cleaned.

[0073] The formation crude oil in the crude oil container and the formation water in the water container can be injected into the closed reaction container according to a set ratio. The set ratio can be the ratio between the formation crude oil and the formation water, for example, 1:1, 1:2, etc.

[0074] In some embodiments, the formation crude oil in the crude oil container may be pumped into the closed reaction vessel by a pump.

[0075] For example, the computer device can control the first multi-way valve to open the connection channel between the pump and the crude oil container; the first multi-way valve can be controlled to close the connection channel between the pump and the water container, the connection channel between the pump and the gas container, and the connection channel between the pump and the closed reaction container; the second multi-way valve can be controlled to open the connection channel between the crude oil container and the closed reaction container; the second multi-way valve can be controlled to close the connection channel between the water container and the closed reaction container, and the connection channel between the gas container and the closed reaction container. The computer device can control the pump to pump the formation crude oil in the crude oil container into the closed reaction container.

[0076] In some embodiments, formation water in a water container may be pumped into a closed reaction vessel by a pump.

[0077] For example, the computer device can control the first multi-way valve to open the connection channel between the pump and the water container; the first multi-way valve can be controlled to close the connection channel between the pump and the crude oil container, the connection channel between the pump and the gas container, and the connection channel between the pump and the closed reaction container; the second multi-way valve can be controlled to open the connection channel between the water container and the closed reaction container; the second multi-way valve can be controlled to close the connection channel between the crude oil container and the closed reaction container, and the connection channel between the gas container and the closed reaction container. The computer device can control the pump to pump the formation water in the water container into the closed reaction container.

[0078] In some embodiments, the temperature and pressure can be set as required. The set temperature is used to simulate the formation temperature. The set pressure is used to simulate the formation pressure. The oil-water mixture in the closed reaction container can be heated by a bellows to heat the oil-water mixture in the closed reaction container to the set temperature. The inert gas in the gas container can be injected into the closed reaction container to make the pressure of the oil-water mixture reach the set pressure. Under the set temperature and the set pressure, direct current can be passed into the oil-water mixture formed by the formation crude oil and formation water in the closed reaction container through the first electrode and the second electrode arranged on the closed reaction container, so as to electrolyze the oil-water mixture by using the direct current electric field formed by the direct current.

[0079] For example, the computer device can control the bellows to heat the oil-water mixture in the closed reaction vessel.

[0080] The inert gas in the gas container can be pumped into the closed reaction vessel by a pump.

[0081] For example, the computer device can control the first multi-way valve to open the connection channel between the pump and the gas container; the first multi-way valve can be controlled to close the connection channel between the pump and the water container, the connection channel between the pump and the crude oil container, and the connection channel between the pump and the closed reaction container; the second multi-way valve can be controlled to open the connection channel between the gas container and the closed reaction container; the second multi-way valve can be controlled to close the connection channel between the water container and the closed reaction container, and the connection channel between the crude oil container and the closed reaction container. The computer device can control the pump to pump the inert gas in the gas container into the closed reaction container.

[0082] The computer device can pre-set the voltage of the power supply; the power supply can be turned on to provide direct current to the first electrode and the second electrode. Direct current can be passed into the oil-water mixture formed by the formation crude oil and formation water in the closed reaction container through the first electrode and the second electrode arranged on the closed reaction container, so as to electrolyze the oil-water mixture by utilizing the direct current electric field formed by the direct current.

[0083] In some embodiments, under the action of the DC electric field, ions in the oil-water mixture undergo redox reactions and electrolysis reactions, thereby changing the conductivity of the oil-water mixture. The computer device can obtain the voltage and current during the electrolysis process, for example, the voltage and current between the first electrode 14 and the second electrode 15.

[0084] In some embodiments, under the action of the DC electric field, alkaline substances in the formation water react with acidic substances in the formation crude oil, generating Joule heat, causing the temperature to rise. The increase in temperature causes the components with lower boiling points in the formation crude oil to vaporize, thereby causing the pressure to change. The computer device can obtain the temperature and pressure of the oil-water mixture during the electrolysis process.

[0085] For example, the computer device may obtain the temperature detected by a temperature sensor and the pressure detected by a pressure sensor.

[0086] In some embodiments, under the action of the DC electric field, ions in the oil-water mixture undergo redox reactions and electrolysis reactions, thereby changing the conductivity of the oil-water mixture. The computer device can obtain the redox potential during the electrolysis process. For example, the computer device can obtain the redox potential during the electrolysis process through the third electrode.

[0087] In some embodiments, the computer device can determine whether the oil-water mixture meets the electrolysis termination condition; if so, the power supply can be turned off to terminate the electrolysis process. The electrolysis termination condition may include at least one of the following: the electrolysis time reaches a set time (e.g., 5 hours, 8 hours, etc.), and the reduction in the redox potential is less than or equal to a set threshold.

[0088] The reduction range may include the difference between two adjacent redox potentials obtained, for example, the difference between the last redox potential and the current redox potential. Alternatively, the reduction range may also include the difference between the initial redox potential at the beginning of electrolysis and the current redox potential.

[0089] In some embodiments, the temperature may rise during the experiment due to Joule heat, causing the components with lower boiling points in the crude oil to vaporize. The closed reaction vessel can better ensure that the vaporized components are cooled to room temperature after the electrolysis is completed, and liquefied into the oil phase under room temperature conditions, thereby minimizing component losses. For this reason, after the electrolysis process is completed, the computer device can continue to obtain the temperature and pressure of the oil-water mixture until the temperature of the oil-water mixture is less than or equal to the set room temperature. After the temperature of the oil-water mixture is less than or equal to the set room temperature, the computer device can discharge the electrolyzed oil-water mixture. For example, the closed reaction vessel can be depressurized, and then the electrolyzed oil-water mixture can be discharged through a piston.

[0090] During the electrolysis process, Joule heat will cause the temperature to rise, resulting in the vaporization of components with lower boiling points in crude oil. The closed reaction vessel can better ensure that the vaporized components are cooled to room temperature after the electrolysis is completed. After the temperature of the oil-water mixture is less than or equal to the set room temperature, the electrolyzed oil-water mixture is discharged, so that the vaporized components can be liquefied into the oil phase. Minimize component loss. Thereby improving the accuracy of the test results.

[0091] In some embodiments, the computer device can obtain the first interfacial tension between oil and water in the oil-water mixture before electrolysis, the first component of the formation oil in the oil-water mixture before electrolysis, and the first pH of the formation water in the oil-water mixture before electrolysis.

[0092] For example, the first interfacial tension between oil and water in the oil-water mixture before electrolysis can be measured by the spinning drop method.

[0093] For example, the formation oil can be analyzed by gas chromatography to obtain the first component of the formation oil. The first component may include saturates, aromatics, resins, asphaltene, etc. By analyzing the formation oil, the content of each of the above components can also be obtained.

[0094] For example, ion content and pH value of formation water can be measured by ion chromatography. Acidity and alkalinity include pH value.

[0095] In some embodiments, the computer device can obtain the second interfacial tension between oil and water in the oil-water mixture after electrolysis, the second component of the oil sample in the oil-water mixture after electrolysis, and the second pH of the water sample in the oil-water mixture after electrolysis.

[0096] For example, the second interfacial tension between oil and water in the oil-water mixture after electrolysis can be measured by the spinning drop method.

[0097] For example, the oil sample can be analyzed by gas chromatography to obtain the second component of the oil sample. The second component may include saturates, aromatics, resins, asphaltene, etc. By analyzing the oil sample, the content of each second component can also be obtained.

[0098] For example, ion chromatograph can be used to measure the ion content and pH value of water samples. The pH value includes the pH value.

[0099] In some embodiments, the computer device can analyze the effect of electrolysis on the properties of oil and water based on the first interfacial tension, the first component, the first pH, the second interfacial tension, the second component, and the second pH.

[0100] The computer device can analyze the effect of electrolysis on the oil-water interfacial tension based on the first interfacial tension and the second interfacial tension. For example, the computer device can compare the first interfacial tension with the second interfacial tension to obtain a comparison result. The comparison result indicates that the second interfacial tension is less than the first interfacial tension. Thus, it can be shown that the DC electric field is beneficial to reducing the oil-water interfacial tension.

[0101] The computer device can calculate the first interfacial tension and the second interfacial tension to obtain an index for indicating the change of the interfacial tension. For example, the computer device can calculate the difference or quotient between the first interfacial tension and the second interfacial tension to obtain an index for indicating the change of the interfacial tension. The index can indicate that the second interfacial tension is less than the first interfacial tension.

[0102] The computer device can analyze the effect of electrolysis on the pH of formation water based on the first pH and the second pH. For example, the computer device can compare the first pH with the second pH to obtain a comparison result. The comparison result indicates that the second pH is greater than the first pH. This can indicate that under the action of a DC electric field, the pH value of formation water will increase, presenting an alkaline environment. The increase in the pH of formation water may be caused by the reaction of alkaline substances in formation water with acidic substances in crude oil to generate carboxylate-type surfactants. The increase in the pH of formation water is beneficial to reducing the oil-water interfacial tension.

[0103] The computer device can calculate the first pH and the second pH to obtain an indicator for indicating the change in pH. For example, the computer device can calculate the difference or quotient between the first pH and the second pH to obtain an indicator for indicating the change in pH. The indicator can indicate that the second pH is greater than the first pH.

[0104] The computer device can analyze the effect of electrolysis on the crude oil composition based on the first component and the second component. For example, the computer device can compare the first component with the second component to obtain a comparison result. The comparison result shows that the composition of the crude oil has changed under the action of the DC electric field. For example, under the influence of the DC electric field, the hydrocarbon composition in the crude oil will become simplified.

[0105] For each component (such as saturated fraction, aromatic fraction, colloid, asphaltene, etc.), the computer device can compare the content of the component before electrolysis with the content after electrolysis to obtain a comparison result of the component. The comparison result indicates the change in the content of the component. The computer device can calculate the content of the component before electrolysis and the content after electrolysis to obtain an index for indicating the change in the content of the component. For example, the computer device can calculate the difference or quotient between the content of the component before electrolysis and the content after electrolysis to obtain an index for indicating the change in the content of the component.

[0106] In some embodiments, the computer device may also obtain a first difference between an initial redox potential at the beginning of electrolysis and a final redox potential at the end of electrolysis; may obtain a second difference between a first interfacial tension and a second interfacial tension; may calculate the first difference and the second difference to obtain a calculation result. The calculation result may, for example, include a quotient between the first difference and the second difference. The calculation result can indicate the degree of influence of the DC electric field on the interfacial tension.

[0107] The method for treating the oil-water mixture in the embodiment of this specification can inject the formation crude oil in the crude oil container into the closed reaction container; the formation water in the water container can be injected into the closed reaction container; the direct current can be passed into the oil-water mixture formed by the formation crude oil and formation water in the closed reaction container through the first electrode and the second electrode arranged on the closed reaction container, so as to electrolyze the oil-water mixture by using the direct current electric field formed by the direct current. The embodiment of this specification can analyze the influence of the direct current electric field on the oil-water interfacial tension. In addition, the embodiment of this specification can also analyze the influence of electrolysis on the pH of formation water and the components of crude oil, so as to facilitate the explanation of the change of the oil-water interfacial tension. In addition, the embodiment of this specification can also analyze the influence of the direct current electric field on the interfacial tension by detecting the redox potential. Thus, the mechanism of improving the recovery rate of electric flooding technology is understood.

[0108] For example, the application of a DC electric field will change the pH and redox environment of the crude oil formation conditions. Under the action of a DC electric field, the pH value of the formation water increases, presenting an alkaline environment. The alkaline substances in the formation water react with the acidic substances in the crude oil to generate carboxylate surfactants, which are beneficial to reducing the oil-water interfacial tension. In addition, under the influence of a DC electric field, the DC electric field is also beneficial to simplifying the hydrocarbon composition in the oil phase. The increase in recovery can be attributed to the increase in permeability, the change in wettability, and the reduction in interfacial tension. The reasons for the increase in heavy oil recovery are mainly concentrated on the change in crude oil components and the reduction of viscosity by electric heating.

[0109] See also Figure 4 The embodiments of this specification also provide another method for treating an oil-water mixture.

[0110] The method may include the following steps.

[0111] Step 41: Obtain a first oil-water mixture based on the formation crude oil and the first formation water.

[0112] Step 42: Detect the first interfacial tension between oil and water in the first oil-water mixture.

[0113] Step 43: electrolyze the first oil-water mixture using a direct current electric field.

[0114] Step 44: Detect the second interfacial tension between oil and water in the first oil-water mixture after electrolysis.

[0115] Step 45: Analyze the effect of electrolysis on the interfacial tension between oil and water based on the first interfacial tension and the second interfacial tension.

[0116] In some embodiments, formation crude oil can be collected; the collected formation crude oil can be pretreated by dehydration, degassing, impurity removal, etc.; brine of a certain concentration can be prepared to simulate a first formation water; and an oil-water mixture can be prepared as a first oil-water mixture according to a set ratio based on the pretreated formation crude oil and the first formation water.

[0117] In some embodiments, the formation crude oil and the first formation water can be injected into a closed reaction container according to a preset ratio; direct current can be passed through the first oil-water mixture in the closed reaction container to electrolyze the first oil-water mixture; after the electrolysis is completed, the electrolyzed first oil-water mixture is discharged from the closed reaction container. The specific process can be referred to the above embodiments.

[0118] In some embodiments, the first interfacial tension between oil and water in the first oil-water mixture before electrolysis can be detected. For example, the first interfacial tension between oil and water in the first oil-water mixture can be detected by using a spinning drop method.

[0119] The second interfacial tension between the oil and water in the first oil-water mixture after electrolysis can be detected. For example, the second interfacial tension between the oil and water in the first oil-water mixture after electrolysis can be detected by using a spinning drop method.

[0120] The effect of electrolysis on the interfacial tension between oil and water can be analyzed based on the first interfacial tension and the second interfacial tension. For example, the first interfacial tension and the second interfacial tension can be compared to obtain a first comparison result. The first comparison result indicates that the second interfacial tension is less than the first interfacial tension. Thus, it can be shown that the DC electric field is beneficial to reducing the oil-water interfacial tension.

[0121] For example, the computer device can calculate the first interfacial tension and the second interfacial tension to obtain an index for indicating the change of the interfacial tension. For example, the computer device can calculate the difference or quotient between the first interfacial tension and the second interfacial tension to obtain an index for indicating the change of the interfacial tension. The index can indicate that the second interfacial tension is less than the first interfacial tension.

[0122] In some embodiments, the formation crude oil before electrolysis can be subjected to component analysis to obtain a first component analysis result. For example, the formation crude oil can be subjected to component analysis by gas chromatography to obtain a first component analysis result. The first component analysis result includes the components in the formation crude oil and the content of each component.

[0123] The oil sample in the first oil-water mixture after electrolysis can be subjected to component analysis to obtain a second component analysis result. For example, the oil sample in the first oil-water mixture after electrolysis can be subjected to component analysis by gas chromatography to obtain a second component analysis result. The second component analysis result includes the components in the oil sample and the content of each component.

[0124] The effect of electrolysis on the crude oil components can be analyzed based on the first component analysis result and the second component analysis result. For example, the first component analysis result and the second component analysis result can be compared to obtain a second comparison result. The second comparison result shows that the components of the crude oil have changed under the action of the DC electric field. For example, under the influence of the DC electric field, the hydrocarbon composition in the crude oil will become simplified.

[0125] For example, for each component (such as saturates, aromatics, colloids, asphaltene, etc.), the computer device can compare the content of the component in the first component analysis result with the content in the second component analysis result to obtain a comparison result of the component. The comparison result indicates the change in the content of the component. The computer device can calculate the content of the component in the first component analysis result and the content in the second component analysis result to obtain an index for indicating the change in the content of the component. For example, the computer device can calculate the difference or quotient between the content of the component in the first component analysis result and the content in the second component analysis result to obtain an index for indicating the change in the content of the component.

[0126] In some embodiments, the first pH value of the first formation water before electrolysis may be detected, for example, by using a pH meter.

[0127] The second pH value of the water sample in the first oil-water mixture after electrolysis can be detected. For example, the second pH value of the water sample in the first oil-water mixture after electrolysis can be measured using a pH meter.

[0128] The effect of electrolysis on the pH of the formation water can be analyzed based on the first pH and the second pH. For example, the first pH and the second pH can be compared to obtain a third comparison result. The third comparison result indicates that the pH value of the formation water will increase.

[0129] For example, the computer device may calculate the first pH and the second pH to obtain an indicator for indicating the change in pH. For example, the computer device may calculate the difference or quotient between the first pH and the second pH to obtain an indicator for indicating the change in pH. The indicator may indicate that the second pH is greater than the first pH.

[0130] In some embodiments, a first salt content of the first formation water before electrolysis and a second salt content of the water sample in the first oil-water mixture after electrolysis can be detected. The effect of electrolysis on the salt content of the formation water can be analyzed based on the first salt content and the second salt content. For example, the first salt content and the second salt content can be compared to obtain a fourth comparison result. The fourth comparison result shows that the salt content of the formation water has changed under the action of the DC electric field.

[0131] For example, the computer device may calculate the first salt content and the second salt content to obtain an index for indicating the change in the salt content. For example, the computer device may calculate the difference or quotient of the first salt content and the second salt content to obtain an index for indicating the change in the salt content.

[0132] In some embodiments, multiple identical first oil-water mixtures can be obtained based on formation crude oil and first formation water; the multiple first oil-water mixtures can be electrolyzed using direct current electric fields with different voltages; the influence of the voltage of the direct current electric field on the interfacial tension between oil and water during electrolysis can be analyzed based on the first interfacial tension, the second interfacial tension and the corresponding voltage of the multiple first oil-water mixtures. For example, for each first oil-water mixture, the first interfacial tension before electrolysis, the second interfacial tension after electrolysis and the voltage corresponding to the first oil-water mixture can be obtained; the first interfacial tension difference between the first interfacial tension and the second interfacial tension can be calculated; and the corresponding relationship between the voltage and the first interfacial tension difference can be established. The corresponding relationship between the voltage and the first interfacial tension difference can be obtained for each first oil-water mixture. From the multiple first oil-water mixtures, the corresponding relationship between multiple voltages and the first interfacial tension difference can be obtained. Thus, the influence of the voltage on the oil-water interfacial tension can be analyzed based on multiple voltages and the first interfacial tension differences corresponding to the multiple voltages.

[0133] For example, a plurality of voltages and the first interfacial tension differences corresponding to the plurality of voltages may be fitted to obtain a function, wherein the function represents the influence of the magnitude of the DC electric field voltage on the oil-water interfacial tension.

[0134] In some embodiments, a second oil-water mixture can be obtained based on the formation crude oil and the second formation water; the third interfacial tension between oil and water in the second oil-water mixture before electrolysis can be detected; the second oil-water mixture can be electrolyzed using a direct current electric field; the fourth interfacial tension between oil and water in the second oil-water mixture after electrolysis can be detected; and the effect of the mineralization of the formation water on the interfacial tension between oil and water during electrolysis can be analyzed based on the first interfacial tension, the second interfacial tension, the third interfacial tension and the fourth interfacial tension.

[0135] For example, the first formation water and the second formation water may be sodium chloride aqueous solutions of different concentrations. The concentration of sodium chloride is used to simulate the mineralization of formation water. The voltage of the DC electric field for electrolyzing the first oil-water mixture may be the same as the voltage of the DC electric field for electrolyzing the second oil-water mixture. Then, the first interfacial tension difference between the first interfacial tension and the second interfacial tension may be calculated; the corresponding relationship between the sodium chloride concentration of the first formation water and the first interfacial tension difference may be established; the second interfacial tension difference between the third interfacial tension and the fourth interfacial tension may be calculated; and the corresponding relationship between the sodium chloride concentration of the second formation water and the second interfacial tension difference may be established. Based on the established corresponding relationship, the influence of different sodium chloride concentrations on the oil-water interfacial tension during electrolysis may be analyzed.

[0136] The technical scheme of the embodiment of this specification can obtain a first oil-water mixture according to the formation crude oil and the first formation water; can detect the first interfacial tension between oil and water in the first oil-water mixture; can use a direct current electric field to electrolyze the first oil-water mixture; can detect the second interfacial tension between oil and water in the first oil-water mixture after electrolysis; can analyze the effect of electrolysis on the interfacial tension between oil and water according to the first interfacial tension and the second interfacial tension. The embodiment of this specification can analyze the effect of the direct current electric field on the oil-water interfacial tension. The direct current electric field can reduce the interfacial tension between crude oil and formation water. In addition, the formation crude oil is treated by applying a direct current electric field and by means of the conductive properties of the formation water, and the formation water is electrolyzed by a direct current electric field to increase the pH value of the solution, react with the acidic substances in the crude oil, promote the increase of the carboxylate component, and promote the adsorption of carboxylates and natural active substances at the interface, thereby reducing the oil-water interfacial tension. The method of this specification is simple, low-cost, less damaging to the formation, and the screening time of indoor experimental schemes and experimental conditions is greatly reduced, which can better reduce the interfacial tension between crude oil and formation water.

[0137] See also Figure 5 The embodiments of this specification also provide a device for treating an oil-water mixture.

[0138] The apparatus may include the following units.

[0139] An acquisition unit 51 is used to acquire a first oil-water mixture according to the formation crude oil and the first formation water;

[0140] A first detection unit 52, used to detect a first interfacial tension between oil and water in a first oil-water mixture;

[0141] The electrolysis unit 53 is used to electrolyze the first oil-water mixture by using a DC electric field;

[0142] A second detection unit 54 is used to detect a second interfacial tension between oil and water in the first oil-water mixture after electrolysis;

[0143] The analyzing unit 55 is used to analyze the effect of electrolysis on the interfacial tension between oil and water according to the first interfacial tension and the second interfacial tension.

[0144] The following introduces a scenario example of an embodiment of this specification.

[0145] Taking the tight oil of a certain oil field as an example, the crude oil used was dehydrated, degassed, and solid impurities were removed before the experiment. The oil sample is a tight crude oil with a viscosity of about 8 mPas at room temperature. The four-component analysis of the oil sample showed that the mass fraction of saturated hydrocarbons was 78.27% and the mass fraction of asphaltene was 3.66%. Taking sodium chloride brine as an example, four different concentrations of sodium chloride aqueous solutions can be prepared, corresponding to formation water with different mineralization (M), which are 0.02 mol / L (1 <M<3g / L)、0.1mol / L(3<M<10g / L)、0.5mol / L(10<M<50g / L)、1mol / L(M> 50g / L). The effect of electrolysis on the oil-water interfacial tension can be analyzed based on the above oil samples and the above four concentrations of sodium chloride brine. The above four concentrations of sodium chloride brine correspond to four different degrees of mineralization, namely: 0.02mol / L, 0.10mol / L, 0.50mol / L, and 1.00mol / L.

[0146] The voltage of the DC electric field can also be set to 4 types, including 5 V, 10 V, 15 V, and 20 V. Please refer to Table 1 for the electrolysis process.

[0147] Table 1

[0148]

[0149] The interfacial tension was measured using the spinning drop method. The rotation speed was set to 6000 r / s, the temperature was set to 25°C, and the droplet capture photography time was set to 1 min. Each sample was measured 3 times to reduce the error, and the average of the 3 measured interfacial tensions was taken.

[0150] After the electrolysis, the pH value of the water in each oil-water mixture can be measured. It is found that the water in the oil-water mixture is alkaline after electrolysis, and the pH value is maintained at about 12.5. The interfacial tension is also analyzed. The results are shown in Figure 6a , Figure 6b , Figure 6c and Figure 6d . Figure 6a The curves showing the changes among interfacial tension, voltage of DC electric field and pH value of water. Figure 6a The corresponding sodium chloride concentration is 0.02 mol / L. Figure 6b The curves showing the changes among interfacial tension, voltage of DC electric field and pH value of water. Figure 6b The corresponding sodium chloride concentration is 0.1 mol / L. Figure 6c The curves showing the changes among interfacial tension, voltage of DC electric field and pH value of water. Figure 6c The corresponding sodium chloride concentration is 0.5 mol / L. Figure 6dThe curves showing the changes among interfacial tension, voltage of DC electric field and pH value of water. Figure 6d The corresponding sodium chloride concentration is 1 mol / L.

[0151] The decrease in interfacial tension of different oil-water mixtures is accompanied by an increase in the pH value of water in the oil-water mixture. It can also be understood that the increase in pH value leads to a decrease in interfacial tension. For the decrease in interfacial tension caused by alkaline solutions, the specific reasons may include: the alkaline substances in the water react with the acidic components in the crude oil to generate surfactants, thereby reducing the interfacial activation energy, which in turn leads to a decrease in interfacial tension.

[0152] See also Figure 7 . Asphaltene and resin molecules are special natural materials with activity in the oil phase, and their hydrophilicity will change with the changes in the acidity and salinity of the solution. After the action of the DC electric field, the pH value of the sodium chloride aqueous solution increases, showing an alkaline solution. Asphaltene and resin will combine with polar compounds containing oxygen, nitrogen, sulfur and other elements in crude oil, and their distribution at the interface will be affected by the strength of the alkalinity. In addition, in an alkaline environment, a certain amount of acidic functional groups will be ionized, which will cause the ionized molecular groups to adsorb at the oil-water interface, thereby causing a decrease in interfacial tension.

[0153] See also Figure 8 . The alkaline aqueous solution reacts with the acidic substances in the oil to produce surfactants, thereby reducing the interfacial tension. The surfactant generated can specifically be carboxylates (see the formula below), which are key substances for reducing interfacial tension. Carboxylates are a type of anionic surfactants, one end of which is connected to a macromolecular group (R), as the lipophilic end, and the other end is a carboxylate group (COO-), as the hydrophilic end. The two ends of the carboxylate act on the interface between the two phases and can play a good connecting role, thereby achieving the effect of reducing surface tension.

[0154] 2NaCl+2H2O=2NaON+H2+Cl2;

[0155] NaOH+R-COOH=R-COONa+H2O.

[0156] The embodiments of the present specification also provide a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above method when executing the computer program.

[0157] The embodiments of the present specification also provide a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program implements the above method when executed by a processor.

[0158] The embodiments of this specification also provide a computer program product, which includes a computer program. When the computer program is executed by a processor, the above method is implemented.

[0159] Those skilled in the art will appreciate that this specification may be provided as a method, system, or computer program product. Therefore, this specification may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, this specification may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0160] This specification is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products of the embodiments of this specification. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. The computer can be a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0161] The various functional units in the embodiments of this specification may be integrated into one processing unit, or each functional unit may exist physically separately, or two or more functional units may be integrated into one processing unit.

[0162] Those skilled in the art will understand that the description of each embodiment in this specification has its own emphasis. For parts not described in detail in a certain embodiment, reference can be made to the relevant description of other embodiments. In addition, it is understood that after reading this specification, those skilled in the art can think of any combination of some or all of the embodiments listed in this specification without creative work, and these combinations are also within the scope of disclosure and protection of this specification.

[0163] Although the present specification is described by way of examples, it is known to those skilled in the art that the above examples are only used to help understand the core idea of ​​the present specification. It is understood by those skilled in the art that there are many variations and changes in the present specification. It is hoped that the appended claims include these variations and changes without departing from the spirit of the present specification.

Claims

1. A method for treating an oil-water mixture, characterized in that: include: Obtaining a first oil-water mixed liquid based on the formation crude oil and the first formation water; detecting a first interfacial tension between oil and water in a first oil-water mixture; electrolyzing the first oil-water mixture by using a direct current electric field; detecting a second interfacial tension between oil and water in the first oil-water mixture after electrolysis; Based on the first interfacial tension and the second interfacial tension, the effect of electrolysis on the interfacial tension between oil and water is analyzed.

2. The method according to claim 1, characterized in that The method further comprises: Performing component analysis on the formation crude oil to obtain a first component analysis result; Performing component analysis on the oil sample in the first oil-water mixed liquid after electrolysis to obtain a second component analysis result; Based on the analysis results of the first component and the second component, the effect of electrolysis on the crude oil composition is analyzed.

3. The method according to claim 1, characterized in that The method further comprises: detecting a first pH value of the first formation water and a second pH value of the water sample in the first oil-water mixture after electrolysis; Based on the first pH and the second pH, the effect of electrolysis on the pH of formation water is analyzed.

4. The method according to claim 1, characterized in that: The method further comprises: detecting a first salt content of the first formation water and a second salt content of the water sample in the first oil-water mixture after electrolysis; The effect of electrolysis on the salt content of formation water is analyzed based on the first salt content and the second salt content.

5. The method according to claim 1, characterized in that: The step of obtaining the first oil-water mixture comprises: Obtaining a plurality of identical first oil-water mixed liquids according to the formation crude oil and the first formation water; The method of electrolyzing the first oil-water mixture by using a direct current electric field comprises: Electrolyzing the plurality of first oil-water mixed liquids using direct current electric fields of different voltages; The analysis of the effect of electrolysis on the interfacial tension between oil and water includes: According to the first interfacial tension, the second interfacial tension and the corresponding voltage of the plurality of first oil-water mixed liquids, the influence of the voltage of the direct current electric field on the interfacial tension between oil and water during electrolysis is analyzed.

6. The method according to claim 1, characterized in that The method further comprises: Obtaining a second oil-water mixed liquid based on the formation crude oil and the second formation water; detecting a third interfacial tension between oil and water in the second oil-water mixture; electrolyzing the second oil-water mixture by using a direct current electric field; detecting a fourth interfacial tension between oil and water in the second oil-water mixed liquid after electrolysis; The analysis of the effect of electrolysis on the interfacial tension between oil and water includes: According to the first interfacial tension, the second interfacial tension, the third interfacial tension and the fourth interfacial tension, the influence of the mineralization of the formation water on the interfacial tension between oil and water during electrolysis is analyzed.

7. The method according to claim 1, characterized in that The step of obtaining the first oil-water mixture comprises: Injecting formation crude oil and first formation water into a closed reaction container according to a preset ratio; The method of electrolyzing the first oil-water mixture by using a direct current electric field comprises: Passing direct current into the first oil-water mixture in the sealed reaction container to electrolyze the first oil-water mixture; After the electrolysis is completed, the first oil-water mixed liquid after the electrolysis is discharged using a closed reaction container.

8. The method according to claim 1, characterized in that The detecting of the first interfacial tension between oil and water in the first oil-water mixture comprises: Using a spinning drop method to detect a first interfacial tension between oil and water in a first oil-water mixture; The detecting of the second interfacial tension between oil and water in the first oil-water mixture after electrolysis comprises: The second interfacial tension between oil and water in the first oil-water mixture after electrolysis is detected by the spinning drop method.

9. An oil-water mixture treatment device, characterized in that: include: An acquisition unit, used for acquiring a first oil-water mixed liquid according to the formation crude oil and the first formation water; A first detection unit, used to detect a first interfacial tension between oil and water in a first oil-water mixture; An electrolysis unit, used for electrolyzing the first oil-water mixture by using a direct current electric field; A second detection unit, used for detecting a second interfacial tension between oil and water in the first oil-water mixture after electrolysis; The risk unit is used to analyze the effect of electrolysis on the interfacial tension between oil and water based on the first interfacial tension and the second interfacial tension.

10. A computer device, characterized in that: include: a memory having a computer program stored thereon; A processor, configured to implement the method according to any one of claims 1 to 8 when executing the computer program.

Images