Method, device, equipment and storage medium for determining emulsification parameters of oil displacement system

Abstract

The present application provides a method, device, equipment and storage medium for determining the emulsification parameters of an oil displacement system, belonging to the technical field of oil production. The method includes: determining the saturated oil volume of a core to be tested, and based on the saturated oil volume, determining the oil displacement volume of the oil displacement system of the core; determining the water cut of the first produced fluid of the core, and if the water cut reaches a preset water cut, determining the first volume of the crude oil in the second produced fluid of the core, and determining the second produced fluid collected under the condition of injecting the oil displacement volume of the oil displacement system into the core, and determining the second volume of the emulsified crude oil in the second produced fluid; based on the first volume, the second volume and the oil displacement volume, determining the emulsification parameters of the oil displacement system in the core. Since it can not only quantitatively determine the emulsification parameters of the oil displacement system, but also simulate the real process of chemical oil displacement of the core by injecting the oil displacement volume of the oil displacement system into the core, the accuracy of the determined emulsification parameters of the oil displacement system is improved.

Description

Technical Field

[0001] The present application relates to the technical field of oil production, and particularly relates to a method, device, equipment and storage medium for determining the emulsification parameters of a flooding system. Background Art

[0002] At present, chemical flooding is one of the important technologies for improving the oil recovery rate. During the process of chemical flooding, the emulsion formed by the flooding system and crude oil is a key factor for improving the oil recovery rate. Since the emulsification parameters of different flooding systems are different, the degree of emulsion formed with crude oil is different, and the degree of improving the oil recovery rate is also different, it is crucial to select a flooding system with appropriate emulsification parameters for improving the oil recovery rate. Therefore, in order to select a flooding system with appropriate emulsification parameters, it is necessary to determine the emulsification parameters of the flooding system before chemical flooding.

[0003] In the related art, different flooding systems are respectively mixed and stirred with crude oil to obtain emulsions of different colors, and testers determine the emulsification parameters of the flooding system according to the colors of the emulsions. However, since the determination of the emulsification parameters of the flooding system by testers is affected by human factors, the accuracy of the emulsification parameters of the flooding system obtained by this determination method is low. Summary of the Invention

[0004] Embodiments of the present application provide a method, device, equipment and storage medium for determining the emulsification parameters of a flooding system, which can improve the accuracy of determining the emulsification parameters of the flooding system. The technical solution is as follows:

[0005] Embodiments of the present application provide a method for determining the emulsification parameters of a flooding system, the method comprising:

[0006] Determine the pore volume of the core to be tested, and based on the pore volume, determine the flooding volume of the flooding system for the core, the flooding volume being positively correlated with the pore volume;

[0007] Determine the water cut of the first produced fluid of the core in a saturated oil state, the first produced fluid being the produced fluid flowing out of the other end of the core collected under the condition of injecting formation water into one end of the core;

[0008] If the water cut reaches a preset water cut, determine the first volume of crude oil in the second produced fluid of the core, and determine the second volume of emulsified crude oil in the second produced fluid, the second produced fluid being the produced fluid flowing out of the other end of the core collected under the condition of injecting the flooding volume of the flooding system into one end of the core;

[0009] Determine the emulsification parameter of the oil displacement system in the core based on the first volume, the second volume, and the oil displacement volume, where the emulsification parameter is used to represent the emulsification ability of the oil displacement system.

[0010] In one possible implementation, determining the water cut of the first produced fluid of the core in the saturated oil state includes:

[0011] Determine the volume of the first produced fluid of the core in the saturated oil state and the volume of formation water in the first produced fluid;

[0012] Determine the ratio of the volume of formation water in the first produced fluid to the volume of the first produced fluid as the water cut of the first produced fluid of the core.

[0013] In another possible implementation, before determining the water cut of the first produced fluid of the core in the saturated oil state, the method further includes:

[0014] Determine the oil production volume of the core. When the oil production volume reaches a preset volume, determine that the core is in the saturated oil state; the oil production volume is the amount of oil flowing out measured under the condition of injecting crude oil into one end of the core in the saturated formation water state until crude oil flows out from the other end of the core.

[0015] In another possible implementation, determining the second volume of the emulsified crude oil in the second produced fluid includes:

[0016] Determine the third volume of crude oil in the third produced fluid, where the third produced fluid is obtained by stirring the second produced fluid added with a demulsifier by a centrifuge;

[0017] Determine the difference between the third volume and the first volume as the second volume of the emulsified crude oil in the second produced fluid.

[0018] In another possible implementation, based on the first volume, the second volume, and the oil displacement volume, determining the emulsification parameter of the oil displacement system in the core includes:

[0019] Based on the first volume, the second volume, and the oil displacement volume, determine the emulsification parameter of the oil displacement system in the core through the following formula (1);

[0020] Formula (1): F e =(V eo / V o ) / V c ×100%

[0021] where F e represents the emulsification parameter of the oil displacement system in the core, and Vo represents the first volume, V eo represents the second volume, V c represents the oil displacement volume.

[0022] In another possible implementation, determining the oil displacement volume of the oil displacement system of the core based on the pore volume includes:

[0023] Determining the pore volume as the oil displacement volume of the oil displacement system of the core.

[0024] On the other hand, an embodiment of the present application provides an emulsification parameter determination device for an oil displacement system, and the device includes:

[0025] A first determination module, configured to determine the pore volume of the core to be tested, and based on the pore volume, determine the oil displacement volume of the oil displacement system of the core, and the oil displacement volume is positively correlated with the pore volume;

[0026] A second determination module, configured to determine the water cut of the first produced fluid of the core in a saturated oil state, and the first produced fluid is the produced fluid flowing out of the other end of the core collected under the condition of injecting formation water into one end of the core;

[0027] A third determination module, configured to, if the water cut reaches a preset water cut, determine the first volume of crude oil in the second produced fluid of the core, and determine the second volume of emulsified crude oil in the second produced fluid, and the second produced fluid is the produced fluid flowing out of the other end of the core collected under the condition of injecting the oil displacement volume of the oil displacement system into one end of the core;

[0028] A fourth determination module, configured to determine the emulsification parameter of the oil displacement system in the core based on the first volume, the second volume, and the oil displacement volume, and the emulsification parameter is used to represent the emulsification parameter of the oil displacement system.

[0029] In a possible implementation, the second determination module is configured to determine the volume of the first produced fluid of the core in a saturated oil state and the volume of formation water in the first produced fluid; determine the ratio of the volume of formation water in the first produced fluid to the volume of the first produced fluid as the water cut of the first produced fluid of the core.

[0030] In another possible implementation, the device further includes: a fifth determination module, configured to determine the oil output of the core, and when the oil output reaches a preset volume, determine that the core is in a saturated oil state; the oil output is the amount of crude oil flowing out measured under the condition of injecting crude oil into one end of the core in a saturated formation water state until crude oil flows out of the other end of the core.

[0031] In another possible implementation, the second determination module is configured to determine the volume of the first produced fluid of the core and the volume of formation water in the first produced fluid; and determine that the ratio of the volume of formation water in the first produced fluid to the volume of the first produced fluid is the water cut of the first produced fluid of the core.

[0032] In another possible implementation, the third determination module is configured to determine the third volume of crude oil in the third produced fluid, where the third produced fluid is obtained by stirring the second produced fluid added with a demulsifier through a centrifuge; and determine that the difference between the third volume and the first volume is the second volume of emulsified crude oil in the second produced fluid.

[0033] In another possible implementation, the fourth determination module is configured to determine the emulsification parameter of the oil displacement system in the core based on the first volume, the second volume, and the oil displacement volume through the following formula (1):

[0034] Formula (1): F e =(V eo / V o ) / V c ×100%

[0035] where F e represents the emulsification parameter of the oil displacement system in the core, V o represents the first volume, V eo represents the second volume, and V c represents the oil displacement volume.

[0036] On the other hand, an embodiment of the present application provides a computer device, which includes: a processor and a memory. At least one program code is stored in the memory, and the at least one program code is loaded and executed by the processor to implement the operations performed in the method for determining the emulsification parameter of the oil displacement system according to any of the above possible implementations.

[0037] On the other hand, an embodiment of the present application provides a computer-readable storage medium, in which at least one program code is stored, and the at least one program code is loaded and executed by a processor to implement the operations performed in the method for determining the emulsification parameter of the oil displacement system according to any of the above possible implementations.

[0038] The beneficial effects of the technical solution provided by the embodiment of the present application at least include:

[0039] The embodiment of the present application provides a method for determining the emulsification parameters of a flooding system. On the one hand, since the first volume of crude oil in the produced fluid, the second volume of emulsified crude oil in the produced fluid, and the flooding volume of the flooding system can be used to quantitatively determine the emulsification parameters of the flooding system, interference from human factors is avoided, and the accuracy of the determined emulsification parameters of the flooding system is improved. On the other hand, since the actual process of chemical flooding of the core is simulated by injecting the flooding volume of the flooding system into the core, the obtained emulsification parameters of the flooding system are more in line with the actual situation, so the accuracy of the determined emulsification parameters of the flooding system is further improved. It can be seen that by determining the emulsification parameters of the flooding system through the present application, both the interference of human factors can be overcome and the actual process of chemical flooding of the core can be simulated, so the accuracy of the determined emulsification parameters of the flooding system is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0041] Figure 1 is a flowchart of a method for determining the emulsification parameters of a flooding system provided by an embodiment of the present application;

[0042] Figure 2 is a schematic structural diagram of a test device for the emulsification parameters of a flooding system provided by an embodiment of the present application;

[0043] Figure 3 is a curve graph showing the variation of the comprehensive oil production rate and the water cut of the produced fluid with the flooding volume provided by an embodiment of the present application;

[0044] Figure 4 is a block diagram of a device for determining the emulsification parameters of a flooding system provided by an embodiment of the present application;

[0045] Figure 5 is a block diagram of a computer device provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0046] To make the objectives, technical solutions, and advantages of the present application clearer, the following will further describe the embodiments of the present application in detail with reference to the drawings.

[0047] Figure 1 is a method for determining the emulsification parameters of a flooding system provided by an embodiment of the present application. Refer to Figure 1 , the method includes:

[0048] 101. The computer device determines the pore volume of the core to be tested, and based on the pore volume, determines the oil displacement volume of the oil displacement system of the core. The oil displacement volume is positively correlated with the pore volume.

[0049] The core to be tested can be an artificial core or a natural core. The length of the core can be any value between 30 cm and 60 cm, for example, 30 cm, 45 cm, 60 cm, etc.; the diameter of the core can be any value between 1 cm and 5 cm, for example, 2 cm, 3 cm, 4 cm, etc.; in the embodiments of the present application, the values of the length and diameter of the core are not specifically limited and can be set and modified as needed.

[0050] For example, the core is a cylindrical Berea core, the diameter of the cylindrical Berea core is 2.5 cm, the length is 30 cm, the permeability is 262 mD, and the porosity is 26.7%.

[0051] It should be noted that before injecting the oil displacement system into one end of the core, the computer device needs to determine the oil displacement volume of the oil displacement system and preset the volume of the oil displacement system injected into the core as the oil displacement volume.

[0052] In a possible implementation manner, the computer device determines the oil displacement volume of the oil displacement system according to the pore volume of the core. Among them, the oil displacement volume is positively correlated with the pore volume of the core. Optionally, the oil displacement volume is the same as the pore volume of the core. Correspondingly, the steps for the computer device to determine the oil displacement volume of the oil displacement system based on the pore volume are: the computer device determines the pore volume of the core and determines that the pore volume of the core is the oil displacement volume of the oil displacement system.

[0053] In another possible implementation manner, the oil displacement volume is any value between 1 times and 5 times the pore volume of the core; for example, 1 time, 2 times, 3 times, etc.; in the embodiments of the present application, the value of the oil displacement volume is not specifically limited and can be set and modified as needed. In the embodiments of the present application, for the sake of easy expression, 1 time the pore volume of the core is expressed as 1PV, and 5 times the pore volume of the core is expressed as 5PV; correspondingly, the oil displacement volume can be any value between 1PV and 5PV.

[0054] In the embodiments of the present application, since the oil displacement volume is not less than the pore volume of the core, it is ensured that the emulsified crude oil can all flow out from the pores of the core. In this way, the emulsified crude oil in the second produced liquid flowing out from the other end of the core is the actually emulsified crude oil in the core, so the accuracy of determining the volume of the emulsified crude oil is improved.

[0055] 102. The computer device determines the water cut of the first produced fluid of the core in the saturated oil volume state, where the first produced fluid is the produced fluid flowing out from the other end of the core collected under the condition of injecting formation water into one end of the core.

[0056] In a possible implementation, the steps for the computer device to determine the water cut of the first produced fluid of the core in the saturated oil volume state are as follows: The computer device determines the volume of the first produced fluid of the core in the saturated oil volume state and the volume of formation water in the first produced fluid; it determines that the ratio of the volume of formation water in the first produced fluid to the volume of the first produced fluid is the water cut of the first produced fluid of the core.

[0057] In a possible implementation, referring to Figure 2 , the test device for the emulsification parameters of the oil displacement system includes a constant-speed pump, a first container, a second container, a third container, a test tube, a graduated cylinder, a constant-temperature box, a pressure sensor, and a computer device; among them, the test tube is used to hold the core to be tested; the first container, the second container, the third container, the test tube, and the pressure sensor are arranged in the constant-temperature box, and the constant-speed pump, the graduated cylinder, and the computer device are arranged outside the constant-temperature box. The constant-speed pump is respectively connected to one end of the first container, one end of the second container, and one end of the third container; the other ends of the first container, the second container, and the third container are respectively connected to the inlet of the test tube, and the outlet of the test tube is connected to the graduated cylinder.

[0058] In a possible implementation, the computer device obtains the total volume of the liquid in the graduated cylinder and the volume of formation water in the graduated cylinder, determines that the total volume of the liquid in the graduated cylinder is the volume of the first produced fluid, and determines that the volume of formation water in the graduated cylinder is the volume of formation water in the first produced fluid.

[0059] Optionally, the test device further includes a liquid level detection device, which can detect the boundary line between different liquids, for example, the boundary line between water and oil; it can also detect the boundary line between a liquid and a gas, for example, the boundary line between oil and air.

[0060] The computer device determines the first height of the liquid in the graduated cylinder and the second height of the formation water in the graduated cylinder through the liquid level detection device; through the first height and the type of the graduated cylinder, it determines the volume of the first produced fluid flowing out from the core from the stored corresponding relationship between the graduated cylinder type, the liquid level height, and the volume; through the second height and the type of the graduated cylinder, it determines the volume of formation water in the first produced fluid from the stored corresponding relationship between the graduated cylinder type, the liquid level height, and the volume.

[0061] In a possible implementation, the computer device is communicatively connected to a constant-speed pump, and the computer device can inject formation water into the core through the constant-speed pump. The specific steps are as follows: The computer device sends an opening signal to the constant-speed pump, the constant-speed pump receives the opening signal, the constant-speed pump starts, provides pressure to the first container, and the first container injects formation water into the core. Optionally, the first container is filled with formation water.

[0062] It should be noted that before the computer device determines the water cut of the first produced fluid of the core in the saturated oil volume state, it is necessary to determine that the core is in the saturated oil volume state. Among them, the steps for the computer device to determine that the core is in the saturated oil volume state are as follows: The computer device determines the oil production volume of the core. When the oil production volume reaches the preset volume, it is determined that the core is in the saturated oil volume state; the oil production volume is the amount of the produced crude oil measured under the condition of injecting crude oil into one end of the core in the saturated formation water state until the crude oil flows out from the other end of the core. Among them, the preset volume can be any value between 30 ml and 50 ml. For example, 30 ml, 40 ml, 50 ml, etc.; in the embodiments of the present application, the value of the preset volume is not specifically limited and can be set and modified according to needs.

[0063] Among them, the core in the saturated formation water state is the core filled with formation water under vacuum conditions. By evacuating the core to be tested, the gas in the gaps of the core can be extracted, so that the formation water can enter the gaps of the core. Among them, the steps of evacuating the core and injecting formation water into the core can be carried out synchronously, that is, when the gas in the gaps of the core is evacuated, the formation water enters the gaps of the core.

[0064] In a possible implementation, the computer device is communicatively connected to a constant-speed pump. The computer device sends an opening signal to the constant-speed pump, the constant-speed pump receives the opening signal, and the constant-speed pump starts to provide pressure to the second container, and the second container injects crude oil into one end of the core. Optionally, the second container is filled with crude oil.

[0065] 103. If the water cut reaches the preset water cut, the computer device determines the first volume of the crude oil in the second produced fluid of the core and determines the second volume of the emulsified crude oil in the second produced fluid. The second produced fluid is the produced fluid collected from the other end of the core under the condition of injecting a displacement volume of the displacement system into one end of the core.

[0066] In a possible implementation, the displacement system is a displacing agent. Among them, the displacing agent is an emulsifier or a polymer or a mixture of an emulsifier and a polymer.

[0067] In a possible implementation, the displacing agent is a polymer, and the molecular weight of the polymer is any value between 19 million and 25 million, for example, 19 million, 22 million, 25 million, etc.; the concentration of the polymer is any value between 1500 mg / L and 2000 mg / L, for example, 1500 mg / L, 1800 mg / L, 2000 mg / L, etc.; in the embodiments of the present application, the values of the molecular weight and concentration of the polymer are not specifically limited and can be modified and set as needed. Optionally, the polymer can be polyacrylamide, the molecular weight of the polyacrylamide is 25 million, and the concentration of the polyacrylamide is 1500 mg / L.

[0068] In another possible implementation, the displacing agent is an emulsifier, and the concentration of the emulsifier is any value between 0.1% and 1.0%, for example, 0.1%, 0.5%, 1.0%, etc.; in the embodiments of the present application, the value of the concentration of the emulsifier is not specifically limited and can be modified and set as needed. Optionally, the emulsifier can be petroleum sulfonate, and the concentration of the petroleum sulfonate is 0.5%.

[0069] In a possible implementation, continue to refer to Figure 2 , the computer device is communicatively connected to the constant-speed pump, and the computer device can inject the oil displacement system into the core through the constant-speed pump. Correspondingly, the steps for the computer device to inject the oil displacement system with an oil displacement volume into the core are as follows: the computer device sends an opening signal to the constant-speed pump, the constant-speed pump receives the opening signal, the constant-speed pump is opened, provides pressure to the third container, and the third container injects the oil displacement system into the core. Optionally, the third container is filled with the oil displacement system.

[0070] In a possible implementation, the computer device determines the emulsified crude oil in the second produced fluid by centrifugation, and obtains the third produced fluid by stirring the second produced fluid with a demulsifier added through a centrifuge. Correspondingly, the steps for the computer device to determine the second volume of the emulsified crude oil in the second produced fluid are as follows: the computer device determines the third volume of the crude oil in the third produced fluid; determines the difference between the third volume and the first volume as the second volume of the emulsified crude oil in the second produced fluid.

[0071] 104. The computer device determines the emulsification parameter of the oil displacement system in the core based on the first volume, the second volume, and the oil displacement volume, and the emulsification parameter is used to represent the emulsification ability of the oil displacement system.

[0072] In a possible implementation, the computer device determines the emulsification parameter of the oil displacement system in the core based on the first volume, the second volume, and the oil displacement volume through the following formula (1);

[0073] Formula (1): F e =(V eo / Vo ) / V c × 100%

[0074] Wherein, F e represents the emulsification parameter of the oil displacement system in the core, V o represents the first volume of crude oil in the second produced fluid of the core, V eo represents the second volume of the emulsified crude oil in the second produced fluid, V c represents the oil displacement volume.

[0075] It should be noted that the emulsification parameters corresponding to different oil displacement systems are different. Here, three different oil displacement systems in Oilfield A are taken as examples for illustration.

[0076] In a possible implementation, the core is a cylindrical Berea core with a diameter of 2.5 cm, a length of 30 cm, a permeability of 262 mD, and a porosity of 26.7%. The oil displacement system is a mixture of an emulsifier and a polymer; wherein, the polymer is polyacrylamide with a molecular weight of 25 million and a concentration of 1500 mg / L; the emulsifier is petroleum sulfonate with a concentration of 0.5%. The crude oil is taken from Oilfield A, and the reservoir temperature of Oilfield A is 53°C, and the viscosity of the crude oil in Oilfield A at 53°C is 51 mPa·s.

[0077] Step 1: The computer device determines the pore volume of the cylindrical Berea core, that is, 1 PV.

[0078] Step 2: The computer device determines the water cut of the first produced fluid of the core; if the water cut reaches 95%, it determines the first volume of crude oil in the second produced fluid of the core and determines the second volume of the emulsified crude oil in the second produced fluid. The second produced fluid is the produced fluid flowing out of the core collected under the condition of injecting 1 PV of the oil displacement system into the core.

[0079] Step 3: The computer device determines the emulsification parameter of the oil displacement system in the core based on the first volume, the second volume, and the oil displacement volume.

[0080] In a possible implementation, the three different oil displacement systems include #1 petroleum sulfonate, #2 petroleum sulfonate, and #3 petroleum sulfonate, and the concentrations of petroleum sulfonate in the three petroleum sulfonates are different. The emulsification parameters of the three petroleum sulfonates and polyacrylamide are 17.7%, 23.1%, and 26.9% respectively.

[0081] Among them, the recovery rate of the No. 1 petroleum sulfonate is 57.5%, which is 29.1% higher than that in the water flooding stage; the lowest water cut of the No. 1 petroleum sulfonate is 45.8%, which is 40.9% lower than that in the water flooding stage. The recovery rate of the No. 2 petroleum sulfonate is 62.8%, which is 31.6% higher than that in the water flooding stage; the lowest water cut of the No. 2 petroleum sulfonate is 40.5%, which is 48.1% lower than that in the water flooding stage. The recovery rate of the No. 3 petroleum sulfonate is 55.8%, which is 25.8% higher than that in the water flooding stage; the lowest water cut of the No. 3 petroleum sulfonate is 37.0%, which is 51.4% lower than that in the water flooding stage.

[0082] Another point to be noted is that the oil displacement system plugs the cores with high permeability through adsorption and bridging effects, causing the oil to flow to the cores with low permeability, improving the overall oil recovery rate of the oilfield, and playing a role in reducing water production and increasing oil production. The following takes increasing the overall recovery rate of cores with different permeabilities in Oilfield B by the oil displacement system as an example for illustration.

[0083] In a possible implementation, the oil displacement system is a mixture of an emulsifier and a polymer; among them, the polymer is polyacrylamide, the molecular weight of the polyacrylamide is 19 million, the concentration of the polyacrylamide is 1500 mg / L; the emulsifier is petroleum sulfonate, and the concentration of the petroleum sulfonate is 0.5%. The crude oil is taken from Oilfield B, the reservoir temperature of Oilfield B is 43 °C, and the viscosity of the crude oil in Oilfield B at 43 °C is 18 mPa·s.

[0084] In the embodiment of the present application, cores with different permeabilities in the reservoir formation are simulated by the method of parallel connection of two cores. The physical parameters of Core A and Core B are shown in Table 1.

[0085] Table 1

[0086] Core number Permeability ratio Permeability Size / cm Porosity / % Core A 6 218 4.5×4.5×30 23.54 Core B 6 1314 4.5×4.5×30 28.35

[0087] Step 1: The computer device determines the pore volume of Core A and Core B, that is, 1 PV.

[0088] Step 2: The computer device determines the water cut of the first produced fluid of Core A and Core B; when the water cut reaches 95%, it determines the first volume of crude oil in the second produced fluid flowing out of Core A and Core B, and determines the second volume of emulsified crude oil in the second produced fluid. The second produced fluid is the produced fluid flowing out of Core A and Core B collected under the condition of injecting 1.5 PV of the oil displacement system into Core A and Core B.

[0089] Step 3: The computer device determines the emulsification parameters of the oil displacement system in Core A and Core B based on the first volume, the second volume, and the oil displacement volume.

[0090] It should be noted that during the process of injecting 1.5 PV of the oil displacement system into Core A and Core B respectively, the emulsification parameters of the oil displacement system in Core A and Core B change dynamically. The oil displacement process of the core includes three stages, namely: the water flooding stage, the oil displacement system flooding stage, and the subsequent water flooding stage. Correspondingly, the comprehensive oil recovery rates of Core A and Core B and the water cut of the produced fluids corresponding to Core A and Core B also change dynamically. For example, refer to Figure 3 the curve graphs showing the changes of the comprehensive oil recovery rates of Core A and Core B and the water cut of the produced fluids corresponding to Core A and Core B with the increase of the oil displacement volume.

[0091] Among them, compared with the water flooding stage, the comprehensive oil recovery rate of Core A in the oil displacement system flooding stage increased by 22.1%; the minimum value of the water cut curve of the produced fluid of Core A was 32.1%. Compared with the water flooding stage, the comprehensive oil recovery rate of Core B in the oil displacement system flooding stage increased by 31.9%, and the minimum value of the water cut curve of the produced fluid of Core B was 34.4%.

[0092] The embodiment of the present application provides a method for determining the emulsification parameters of an oil displacement system. On the one hand, since the first volume of crude oil in the produced fluid, the second volume of emulsified crude oil in the produced fluid, and the oil displacement volume of the oil displacement system can be used to quantitatively determine the emulsification parameters of the oil displacement system, it avoids the interference of human factors and improves the accuracy of the determined emulsification parameters of the oil displacement system; on the other hand, since the real process of chemical oil displacement of the core is simulated by injecting the oil displacement volume of the oil displacement system into the core, the obtained emulsification parameters of the oil displacement system are more in line with the actual situation, so the accuracy of the determined emulsification parameters of the oil displacement system is further improved. It can be seen that by determining the emulsification parameters of the oil displacement system through the present application, it can not only overcome the interference of human factors, but also simulate the real process of chemical oil displacement of the core, so the accuracy of the determined emulsification parameters of the oil displacement system is improved.

[0093] Figure 4 is a block diagram of a device for determining the emulsification parameters of an oil displacement system provided by the embodiment of the present application. Refer to Figure 4 The device includes:

[0094] The first determination module 401 is configured to determine the pore volume of the core to be tested, and based on the pore volume, determine the oil displacement volume of the oil displacement system of the core, and the oil displacement volume is positively correlated with the pore volume;

[0095] The second determination module 402 is configured to determine the water cut of the first produced fluid of the core in the saturated oil state, and the first produced fluid is the produced fluid flowing out of the other end of the core collected under the condition of injecting formation water into one end of the core;

[0096] A third determination module 403, configured to, if the water content reaches a preset water content, determine a first volume of crude oil in the second produced fluid of the core and determine a second volume of emulsified crude oil in the second produced fluid, where the second produced fluid is the produced fluid flowing out of the other end of the core collected under the condition that a displacement fluid volume of a displacement fluid system is injected into one end of the core;

[0097] A fourth determination module 404, configured to determine an emulsification parameter of the displacement fluid system in the core based on the first volume, the second volume, and the displacement fluid volume, where the emulsification parameter is used to represent the emulsification parameter of the displacement fluid system.

[0098] In a possible implementation manner, the second determination module 402 is configured to determine a volume of the first produced fluid of the core in a saturated oil volume state and a volume of formation water in the first produced fluid; determine a ratio of the volume of formation water in the first produced fluid to the volume of the first produced fluid as the water content of the first produced fluid of the core.

[0099] In another possible implementation manner, the apparatus further includes: a fifth determination module, configured to determine an oil production volume of the core, and if the oil production volume reaches a preset volume, determine that the core is in a saturated oil volume state; the oil production volume is the amount of produced crude oil measured under the condition that crude oil is injected into one end of the core in a saturated formation water state until crude oil flows out of the other end of the core.

[0100] In another possible implementation manner, the second determination module 402 is configured to determine a volume of the first produced fluid of the core and a volume of formation water in the first produced fluid; determine a ratio of the volume of formation water in the first produced fluid to the volume of the first produced fluid as the water content of the first produced fluid of the core.

[0101] In another possible implementation manner, the third determination module 403 is configured to determine a third volume of crude oil in the third produced fluid, where the third produced fluid is obtained by stirring the second produced fluid added with a demulsifier by a centrifuge; determine a difference between the third volume and the first volume as the second volume of emulsified crude oil in the second produced fluid.

[0102] In another possible implementation manner, the fourth determination module 404 is configured to determine an emulsification parameter of the displacement fluid system in the core based on the first volume, the second volume, and the displacement fluid volume through the following formula (1);

[0103] Formula (1): F e =(V eo / V o ) / V c ×100%

[0104] where F e represents the emulsification parameter of the displacement fluid system in the core, V o represents the first volume, V eoRepresents the second volume, V c Represents the oil displacement volume.

[0105] The embodiment of the present application provides a device for determining the emulsification parameters of an oil displacement system. On the one hand, since the emulsification parameters of the oil displacement system can be quantitatively determined by the first volume of crude oil in the produced fluid, the second volume of emulsified crude oil in the produced fluid, and the oil displacement volume of the oil displacement system, interference from human factors is avoided, and the accuracy of the determined emulsification parameters of the oil displacement system is improved. On the other hand, since the actual process of chemical oil displacement of the core is simulated by injecting the oil displacement volume of the oil displacement system into the core, the emulsification parameters of the obtained oil displacement system are more in line with the actual situation, so the accuracy of the determined emulsification parameters of the oil displacement system is further improved. It can be seen that by determining the emulsification parameters of the oil displacement system in the present application, both the interference of human factors can be overcome and the actual process of chemical oil displacement of the core can be simulated, so the accuracy of the determined emulsification parameters of the oil displacement system is improved.

[0106] Figure 5 The block diagram of the terminal 500 provided by an exemplary embodiment of the present invention is shown. The terminal 500 may be: a smart phone, a tablet computer, an MP3 player (Moving Picture Experts Group Audio Layer III), an MP4 (Moving Picture Experts Group Audio Layer IV) player, a notebook computer or a desktop computer. The terminal 500 may also be referred to by other names such as user equipment, portable terminal, laptop terminal, desktop terminal, etc.

[0107] Generally, the terminal 500 includes: a processor 501 and a memory 502.

[0108] The processor 501 may include one or more processing cores, such as a quad-core processor, an octa-core processor, etc. The processor 501 may be implemented in at least one hardware form of DSP (Digital Signal Processing), FPGA (Field-Programmable Gate Array), or PLA (Programmable Logic Array). The processor 501 may also include a main processor and a coprocessor. The main processor is a processor used to process data in the wake state, also known as the CPU (Central Processing Unit); the coprocessor is a low-power processor used to process data in the standby state. In some embodiments, the processor 501 may be integrated with a GPU (Graphics Processing Unit), and the GPU is responsible for rendering and drawing the content to be displayed on the display screen. In some embodiments, the processor 501 may further include an AI (Artificial Intelligence) processor, and the AI processor is used to process computational operations related to machine learning.

[0109] The memory 502 may include one or more computer-readable storage media, and the computer-readable storage media may be non-transitory. The memory 502 may further include high-speed random access memory and non-volatile memory, such as one or more disk storage devices and flash storage devices. In some embodiments, the non-transitory computer-readable storage media in the memory 502 is used to store at least one instruction, and the at least one instruction is used to be executed by the processor 501 to implement the method for determining the emulsification parameters of the oil displacement system provided in the method embodiments of the present application.

[0110] In some embodiments, the terminal 500 may further optionally include: a peripheral device interface 503 and at least one peripheral device. The processor 501, the memory 502, and the peripheral device interface 503 may be connected through a bus or signal lines. Each peripheral device may be connected to the peripheral device interface 503 through a bus, signal lines, or a circuit board. Specifically, the peripheral devices include at least one of a radio frequency circuit 504, a display screen 505, a camera 506, an audio circuit 507, a positioning component 508, and a power supply 509.

[0111] The peripheral device interface 503 can be used to connect at least one I / O (Input / Output) related peripheral device to the processor 501 and the memory 502. In some embodiments, the processor 501, the memory 502, and the peripheral device interface 503 are integrated on the same chip or circuit board; in some other embodiments, any one or two of the processor 501, the memory 502, and the peripheral device interface 503 can be implemented on a separate chip or circuit board, and this embodiment does not limit this.

[0112] The radio frequency circuit 504 is used to receive and transmit RF (Radio Frequency) signals, also known as electromagnetic signals. The radio frequency circuit 504 communicates with the communication network and other communication devices through electromagnetic signals. The radio frequency circuit 504 converts an electrical signal into an electromagnetic signal for transmission, or converts the received electromagnetic signal into an electrical signal. Optionally, the radio frequency circuit 504 includes: an antenna system, an RF transceiver, one or more amplifiers, a tuner, an oscillator, a digital signal processor, a codec chipset, a subscriber identity module card, and so on. The radio frequency circuit 504 can communicate with other terminals through at least one wireless communication protocol. The wireless communication protocol includes but is not limited to: metropolitan area network, each generation of mobile communication network (2G, 3G, 4G, and 5G), wireless local area network, and / or WiFi (Wireless Fidelity) network. In some embodiments, the radio frequency circuit 504 may further include a circuit related to NFC (Near Field Communication), and this application does not limit this.

[0113] The display screen 505 is used to display the UI (User Interface). The UI may include graphics, text, icons, videos, and any combination thereof. When the display screen 505 is a touch display screen, the display screen 505 also has the ability to collect touch signals on or above the surface of the display screen 505. The touch signal can be input to the processor 501 as a control signal for processing. At this time, the display screen 505 can also be used to provide virtual buttons and / or a virtual keyboard, also known as soft buttons and / or a soft keyboard. In some embodiments, there may be one display screen 505, which is disposed on the front panel of the terminal 500; in other embodiments, there may be at least two display screens 505, which are respectively disposed on different surfaces of the terminal 500 or are in a folding design; in still other embodiments, the display screen 505 may be a flexible display screen, which is disposed on a curved surface or a folding surface of the terminal 500. Even further, the display screen 505 can also be set to an irregular non-rectangular shape, that is, a special-shaped screen. The display screen 505 can be prepared using materials such as LCD (Liquid Crystal Display) and OLED (Organic Light-Emitting Diode).

[0114] The camera module 506 is used to capture images or videos. Optionally, the camera module 506 includes a front camera and a rear camera. Generally, the front camera is disposed on the front panel of the terminal, and the rear camera is disposed on the back of the terminal. In some embodiments, there are at least two rear cameras, which are respectively any one of a main camera, a depth-of-field camera, a wide-angle camera, and a telephoto camera, so as to implement the function of background blurring by fusing the main camera and the depth-of-field camera, the function of panoramic shooting by fusing the main camera and the wide-angle camera, and the VR (Virtual Reality) shooting function or other fused shooting functions. In some embodiments, the camera module 506 may further include a flash. The flash can be a single-color-temperature flash or a two-color-temperature flash. A two-color-temperature flash refers to a combination of a warm-light flash and a cold-light flash, which can be used for light compensation under different color temperatures.

[0115] The audio circuit 507 may include a microphone and a speaker. The microphone is used to collect sound waves of the user and the environment, and convert the sound waves into electrical signals for input to the processor 501 for processing, or input to the radio frequency circuit 504 to achieve voice communication. For the purpose of stereo collection or noise reduction, there may be multiple microphones, which are respectively arranged at different parts of the terminal 500. The microphone may also be an array microphone or an omnidirectional collection microphone. The speaker is used to convert the electrical signal from the processor 501 or the radio frequency circuit 504 into sound waves. The speaker may be a traditional thin film speaker or a piezoelectric ceramic speaker. When the speaker is a piezoelectric ceramic speaker, it can not only convert the electrical signal into sound waves audible to humans, but also convert the electrical signal into sound waves inaudible to humans for uses such as ranging. In some embodiments, the audio circuit 507 may also include a headphone jack.

[0116] The positioning component 508 is used to locate the current geographical location of the terminal 500 to achieve navigation or LBS (Location Based Service). The positioning component 508 may be a positioning component based on the GPS (Global Positioning System) of the United States, the Beidou system of China, the GLONASS system of Russia, or the Galileo system of the European Union.

[0117] The power supply 509 is used to supply power to each component in the terminal 500. The power supply 509 may be alternating current, direct current, a disposable battery, or a rechargeable battery. When the power supply 509 includes a rechargeable battery, the rechargeable battery may support wired charging or wireless charging. The rechargeable battery may also be used to support fast charging technology.

[0118] In some embodiments, the terminal 500 further includes one or more sensors 510. The one or more sensors 510 include but are not limited to: an acceleration sensor 511, a gyroscope sensor 512, a pressure sensor 513, a fingerprint sensor 514, an optical sensor 515, and a proximity sensor 516.

[0119] The acceleration sensor 511 can detect the magnitude of acceleration on the three coordinate axes of the coordinate system established with the terminal 500. For example, the acceleration sensor 511 can be used to detect the components of the gravitational acceleration on the three coordinate axes. The processor 501 can control the display screen 505 to display the user interface in a landscape view or a portrait view according to the gravitational acceleration signal collected by the acceleration sensor 511. The acceleration sensor 511 can also be used for collecting game or user's motion data.

[0120] The gyroscope sensor 512 can detect the body orientation and rotation angle of the terminal 500. The gyroscope sensor 512 can cooperate with the acceleration sensor 511 to collect the 3D actions of the user on the terminal 500. Based on the data collected by the gyroscope sensor 512, the processor 501 can implement the following functions: motion sensing (such as changing the UI according to the user's tilting operation), image stabilization during shooting, game control, and inertial navigation.

[0121] The pressure sensor 513 can be disposed on the side frame of the terminal 500 and / or the lower layer of the display screen 505. When the pressure sensor 513 is disposed on the side frame of the terminal 500, it can detect the holding signal of the user on the terminal 500, and the processor 501 can perform left / right hand recognition or quick operation according to the holding signal collected by the pressure sensor 513. When the pressure sensor 513 is disposed on the lower layer of the display screen 505, the processor 501 can control the operable controls on the UI interface according to the pressure operation of the user on the display screen 505. The operable controls include at least one of button controls, scroll bar controls, icon controls, and menu controls.

[0122] The fingerprint sensor 514 is used to collect the fingerprints of the user. The processor 501 can identify the user's identity according to the fingerprints collected by the fingerprint sensor 514, or the fingerprint sensor 514 can identify the user's identity according to the collected fingerprints. When the identified user identity is a trusted identity, the processor 501 authorizes the user to perform relevant sensitive operations, and the sensitive operations include unlocking the screen, viewing encrypted information, downloading software, making payments, and changing settings, etc. The fingerprint sensor 514 can be disposed on the front, back, or side of the terminal 500. When there are physical buttons or manufacturer Logos on the terminal 500, the fingerprint sensor 514 can be integrated with the physical buttons or manufacturer Logos.

[0123] The optical sensor 515 is used to collect the ambient light intensity. In one embodiment, the processor 501 can control the display brightness of the display screen 505 according to the ambient light intensity collected by the optical sensor 515. Specifically, when the ambient light intensity is high, the display brightness of the display screen 505 is increased; when the ambient light intensity is low, the display brightness of the display screen 505 is decreased. In another embodiment, the processor 501 can also dynamically adjust the shooting parameters of the camera module 506 according to the ambient light intensity collected by the optical sensor 515.

[0124] The proximity sensor 516, also known as a distance sensor, is typically disposed on the front panel of the terminal 500. The proximity sensor 516 is used to collect the distance between the user and the front of the terminal 500. In one embodiment, when the proximity sensor 516 detects that the distance between the user and the front of the terminal 500 is gradually decreasing, the processor 501 controls the display screen 505 to switch from the lit state to the off state; when the proximity sensor 516 detects that the distance between the user and the front of the terminal 500 is gradually increasing, the processor 501 controls the display screen 505 to switch from the off state to the lit state.

[0125] Those skilled in the art can understand that Figure 5 the structure shown in does not constitute a limitation on the terminal 500, and may include more or fewer components than shown in the figure, or combine some components, or adopt a different component arrangement.

[0126] The embodiment of the present application also provides a computer-readable storage medium, in which at least one program code is stored, and the at least one program code is loaded and executed by a processor to implement the operations performed by the method for determining the emulsification parameters of the oil displacement system in any of the above possible implementation manners.

[0127] The above are only optional embodiments of the present application, and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for determining the emulsification parameters of an oil displacement system, characterized in that, the method comprises: determining the pore volume of a core to be tested, and based on the pore volume, determining the oil displacement volume of the oil displacement system of the core, wherein the oil displacement volume is positively correlated with the pore volume; determining the water cut of the first produced fluid of the core in a saturated oil state, where the first produced fluid is the produced fluid flowing out of the other end of the core collected under the condition of injecting formation water into one end of the core; if the water cut reaches a preset water cut, determining the first volume of crude oil in the second produced fluid of the core, where the second produced fluid is the produced fluid flowing out of the other end of the core collected under the condition of injecting the oil displacement volume of the oil displacement system into one end of the core; determining the third volume of crude oil in the third produced fluid, where the third produced fluid is obtained by stirring the second produced fluid added with a demulsifier by a centrifuge; determining the difference between the third volume and the first volume as the second volume of the emulsified crude oil in the second produced fluid; based on the first volume, the second volume and the oil displacement volume, determining the emulsification parameters of the oil displacement system in the core through the following formula (1); Formula 1: F e = (V eo / V o ) / V c × 100%; Among them, F e represents the emulsification parameter of the oil displacement system in the core, V o represents the first volume, V eo represents the second volume, V c represents the oil displacement volume, and the emulsification parameter is used to represent the emulsification ability of the oil displacement system.

2. The determination method according to claim 1, characterized in that, the determination of the water cut of the first produced fluid of the core in a saturated oil state includes: determining the volume of the first produced fluid of the core in a saturated oil state and the volume of formation water in the first produced fluid; determining the ratio of the volume of formation water in the first produced fluid to the volume of the first produced fluid as the water cut of the first produced fluid of the core.

3. The determination method according to claim 1, characterized in that, before the determination of the water cut of the first produced fluid of the core in a saturated oil state, the method further includes: determining the oil production volume of the core, and when the oil production volume reaches a preset volume, determining that the core is in a saturated oil state; the oil production volume is the amount of crude oil flowing out measured under the condition of injecting crude oil into one end of the core in a saturated formation water state until crude oil flows out of the other end of the core.

4. An apparatus for determining the emulsification parameters of an oil displacement system, characterized in that, the apparatus includes: a first determination module, configured to determine the pore volume of a core to be tested, and based on the pore volume, determine the oil displacement volume of the oil displacement system of the core, wherein the oil displacement volume is positively correlated with the pore volume; a second determination module, configured to determine the water cut of the first produced fluid of the core in a saturated oil state, where the first produced fluid is the produced fluid flowing out of the other end of the core collected under the condition of injecting formation water into one end of the core; A third determination module, configured to, if the water content reaches a preset water content, determine a first volume of crude oil in a second produced fluid of the core, where the second produced fluid is the produced fluid flowing out of the other end of the core collected under the condition that a displacement fluid volume of a displacement fluid system is injected into one end of the core; determine a third volume of crude oil in a third produced fluid, where the third produced fluid is obtained by stirring the second produced fluid added with a demulsifier by a centrifuge; and determine a difference between the third volume and the first volume as a second volume of the emulsified crude oil in the second produced fluid. The fourth determination module is configured to determine the emulsification parameter of the oil displacement system in the core based on the first volume, the second volume, and the oil displacement volume through the following formula (1); Formula (1): F e = (V eo / V o ) / V c × 100%; where F e represents the emulsification parameter of the oil displacement system in the core, V o represents the first volume, V eo represents the second volume, and V c represents the oil displacement volume, and the emulsification parameter is used to represent the emulsification ability of the oil displacement system.

5. The determination device according to claim 4, wherein the second determination module is configured to determine a volume of a first produced fluid of the core in a saturated oil state and a volume of formation water in the first produced fluid; and determine a ratio of the volume of the formation water in the first produced fluid to the volume of the first produced fluid as the water content of the first produced fluid of the core.

6. A computer device, wherein the computer device includes: a processor and a memory, where at least one program code is stored in the memory, and the at least one program code is loaded and executed by the processor to implement the operations performed in the method for determining the emulsification parameters of the displacement fluid system according to any one of claims 1 to 3.

7. A computer-readable storage medium, wherein at least one program code is stored in the computer-readable storage medium, and the at least one program code is loaded and executed by a processor to implement the operations performed in the method for determining the emulsification parameters of the displacement fluid system according to any one of claims 1 to 3.

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