CN111650090B - Polymer meter residual quantity determination method and device for compound flooding produced water - Google Patents
Polymer meter residual quantity determination method and device for compound flooding produced water Download PDFInfo
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Abstract
The application provides a polymer table residual quantity determination method and a device for compound flooding produced water, wherein the method comprises the following steps: obtaining standard interface tension, standard interface shear viscosity and injection concentration of polymer and surfactant in on-site compound flooding; determining a plurality of reference polymer concentrations and a plurality of reference surfactant concentrations from the injected concentrations of the polymer and the surfactant; acquiring the interfacial tension and interfacial shear viscosity of a simulated oil-water interface system formed by each simulated produced water and the crude oil produced on site in the various simulated produced water; and screening target simulated produced water from the various simulated produced water based on the standard interfacial tension, the standard interfacial shear viscosity and the interfacial tension and the interfacial shear viscosity corresponding to each simulated produced water, and taking the reference polymer concentration and the reference surfactant concentration of the target simulated produced water as the polymer concentration and the surfactant concentration of the field produced water. The scheme provides a simple, convenient and accurate prediction method of the concentration of the polymer surface with low cost.
Description
Technical Field
The application relates to the technical field of compound flooding water produced liquid treatment, in particular to a method and a device for determining polymer surface residual quantity of compound flooding produced water.
Background
With the gradual maturity of tertiary oil recovery technology, the combination flooding oil recovery technology is increasingly applied to the work of improving the recovery ratio of each large oil field. At present, the combined flooding oil recovery technology can provide more than 20% of oil field production increasing benefits. Although the use of the composite flooding obtains considerable yield-increasing benefit, due to the components such as polymer, surfactant, alkali and the like contained in the flooding system, on one hand, the viscosity of the crude oil produced liquid is increased, on the other hand, the crude oil and the produced water are seriously emulsified, the stability of the crude oil emulsion is greatly increased, the emulsion system is complicated, and the research on the emulsion denaturation of the crude oil is also an important content in the emulsion gathering and transportation process.
However, due to different detection conditions for the composite flooding produced fluid on site, part of stations lack accurate produced fluid component detection and analysis means, so that the stations have insufficient knowledge on the polymer surface content of the produced fluid, and adverse effects are caused on subsequent analysis of the physical properties of the produced fluid and formulation of a produced fluid treatment process.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The embodiment of the application provides a polymer meter residual quantity determining method and device for composite flooding produced water, and aims to solve the problem that a part of stations lack a produced water polymer meter residual quantity detecting means in the prior art.
The embodiment of the application provides a polymer table residual quantity determination method for composite flooding produced water, which comprises the following steps: acquiring standard interface tension, standard interface shear viscosity and injection concentration of a polymer and a surfactant used in on-site compound flooding, wherein the standard interface tension and the standard interface shear viscosity are respectively the interface tension and the interface shear viscosity of a standard oil-water interface system formed by on-site produced crude oil and on-site produced water; determining a plurality of reference polymer concentrations and a plurality of reference surfactant concentrations according to injection concentrations of a polymer and a surfactant used in the onsite compound flooding; acquiring the interfacial tension and interfacial shear viscosity of a simulated oil-water interface system formed by each simulated produced water and crude oil produced on site in a plurality of simulated produced water, and acquiring the interfacial tension and interfacial shear viscosity corresponding to each simulated produced water, wherein each simulated produced water is the simulated produced water configured according to each reference polymer concentration in a plurality of reference polymer concentrations and each reference surfactant concentration in a plurality of reference surfactant concentrations; and screening target simulated produced water from the various simulated produced water based on the standard interfacial tension, the standard interfacial shear viscosity and the interfacial tension and the interfacial shear viscosity corresponding to each simulated produced water, and taking the reference polymer concentration and the reference surfactant concentration corresponding to the target simulated produced water as the polymer concentration and the surfactant concentration of the field produced water.
In one embodiment, determining a plurality of reference polymer concentrations and a plurality of reference surfactant concentrations from injection concentrations of polymer and surfactant used in an in situ compound flood comprises: taking the injection concentration of the polymer used in the on-site compound flooding as the maximum reference polymer concentration, and taking the injection concentration of the surfactant used in the on-site compound flooding as the maximum reference surfactant concentration; determining a minimum reference polymer concentration and a minimum reference surfactant concentration to be zero; the maximum reference polymer concentration, the minimum reference polymer concentration, and several polymer concentrations between the maximum reference polymer concentration and the minimum reference polymer concentration are taken as a plurality of reference polymer concentrations, and the maximum reference surfactant concentration, the minimum reference surfactant concentration, and several surfactant concentrations between the maximum reference surfactant concentration and the minimum reference surfactant concentration are taken as a plurality of reference surfactant concentrations.
In one embodiment, screening a target simulated produced water from a plurality of simulated produced waters based on a standard interfacial tension, a standard interfacial shear viscosity, and an interfacial tension and an interfacial shear viscosity corresponding to each simulated produced water comprises: calculating tension difference values between the interface tension corresponding to each simulated produced water and the standard interface tension to obtain a plurality of tension difference values; determining the simulated produced water corresponding to a first preset number of tension difference values with the smallest absolute value in the tension difference values as first simulated produced water to obtain first simulated produced water with a first preset number; calculating viscosity difference values between the interface shear viscosity and the standard interface shear viscosity corresponding to each simulated produced water in the first simulated produced water of the first preset number to obtain viscosity difference values of the first preset number; and determining the simulated produced water corresponding to the viscosity difference value with the minimum absolute value in the first preset number of viscosity difference values as target simulated produced water.
In one embodiment, the determining the simulated produced water corresponding to the first preset number of tension difference values with the smallest absolute value in the plurality of tension difference values as the first simulated produced water comprises: judging whether the absolute value of the tension difference values of a first preset number with the minimum absolute value in the tension difference values is smaller than a first preset threshold value or not; and under the condition that the absolute value of the tension difference values of the first preset number with the smallest absolute value in the tension difference values is judged to be smaller than a first preset threshold value, determining the simulated produced water corresponding to the tension difference values of the first preset number as first simulated produced water.
In one embodiment, determining the simulated produced water corresponding to the viscosity difference value with the smallest absolute value in the first preset number of viscosity difference values as the target simulated produced water comprises: judging whether the absolute value of the viscosity difference value with the minimum absolute value in the viscosity difference values of the first preset number is smaller than a second preset threshold value or not; and under the condition that the absolute value of the viscosity difference value with the minimum absolute value in the first preset number of viscosity difference values is judged to be smaller than a second preset threshold value, determining the simulated produced water corresponding to the viscosity difference value with the minimum absolute value in the first preset number of viscosity difference values as target simulated produced water.
In one embodiment, screening a target simulated produced water from a plurality of simulated produced waters based on a standard interfacial tension, a standard interfacial shear viscosity, and an interfacial tension and an interfacial shear viscosity corresponding to each simulated produced water comprises: calculating viscosity difference values between the interface shear viscosity corresponding to each simulated produced water and the standard interface shear viscosity to obtain a plurality of viscosity difference values; determining the simulated produced water corresponding to a second preset number of viscosity difference values with the smallest absolute value in the plurality of viscosity difference values as second simulated produced water to obtain second simulated produced water with a second preset number; calculating a tension difference value between the interface tension corresponding to each simulated produced water in a second preset number of second simulated produced water and the standard interface tension to obtain a tension difference value of a second preset number; and determining the simulated produced water corresponding to the tension difference value with the minimum absolute value in the tension difference values of the second preset number as the target simulated produced water.
In one embodiment, screening a target simulated produced water from a plurality of simulated produced waters based on a standard interfacial tension, a standard interfacial shear viscosity, and an interfacial tension and an interfacial shear viscosity corresponding to each simulated produced water comprises: calculating a tension relative difference value between the interface tension corresponding to each simulated produced water and the standard interface tension and a viscosity relative difference value between the interface shear viscosity corresponding to each simulated produced water and the standard interface shear viscosity to obtain a tension relative difference value and a viscosity relative difference value corresponding to each simulated produced water; acquiring a preset total relative difference model, and obtaining a total relative difference corresponding to each simulated produced water based on the preset total relative difference model and the corresponding tension relative difference and viscosity relative difference of each simulated produced water, wherein the total relative difference model comprises a functional relation between the total relative difference and the corresponding tension relative difference and viscosity relative difference; and determining the simulated produced water corresponding to the minimum total relative difference value in the total relative difference values corresponding to the simulated produced water as the target simulated produced water.
The embodiment of the application also provides a polymer table residual quantity determining device of the compound flooding produced water, which comprises: the system comprises a first acquisition module, a second acquisition module and a third acquisition module, wherein the first acquisition module is used for acquiring standard interface tension, standard interface shear viscosity and injection concentration of a polymer and a surfactant used in on-site compound flooding, and the standard interface tension and the standard interface shear viscosity are respectively the interface tension and the interface shear viscosity of a standard oil-water interface system formed by on-site produced crude oil and on-site produced water; the determining module is used for determining a plurality of reference polymer concentrations and a plurality of reference surfactant concentrations according to the injection concentrations of the polymer and the surfactant used in the on-site compound flooding; the second acquisition module is used for acquiring the interfacial tension and the interfacial shear viscosity of a simulated oil-water interface system formed by each simulated produced water and the crude oil produced on site in the various simulated produced water to obtain the interfacial tension and the interfacial shear viscosity corresponding to each simulated produced water, wherein each simulated produced water is the simulated produced water configured according to each reference polymer concentration in the reference polymer concentrations and each reference surfactant concentration in the reference surfactant concentrations; and the screening module is used for screening target simulated produced water from the various simulated produced water based on the standard interfacial tension, the standard interfacial shear viscosity and the interfacial tension and the interfacial shear viscosity corresponding to each simulated produced water, and taking the reference polymer concentration and the reference surfactant concentration corresponding to the target simulated produced water as the polymer concentration and the surfactant concentration of the field produced water.
The embodiment of the application further provides computer equipment, which comprises a processor and a memory for storing processor executable instructions, wherein the processor executes the instructions to realize the step of the polymer table residual quantity determination method of the composite flooding produced water in any embodiment.
Embodiments of the present application also provide a computer-readable storage medium, on which computer instructions are stored, and the instructions, when executed, implement the steps of the method for determining the polymer table residual quantity of the produced water of compound flooding described in any of the above embodiments.
In the embodiment of the application, a polymer surface residual quantity determining method of the compound flooding produced water is provided, interface tension and interface shear viscosity of an oil-water interface system formed by site produced crude oil and site produced water are used as standard interface tension and standard interface shear viscosity, injection concentrations of a polymer and a surfactant used in the site compound flooding are obtained, a plurality of reference polymer concentrations and a plurality of reference surfactant concentrations are determined according to the injection concentrations of the polymer and the surfactant, interface tension and interface shear viscosity of a simulated oil-water interface system formed by each simulated produced water in a plurality of simulated produced water and the site produced crude oil configured according to the plurality of reference polymer concentrations and the plurality of reference surfactant concentrations are obtained, and then target simulated produced water is screened from the plurality of simulated produced water based on the standard interface tension, the standard interface shear viscosity and the interface tension and the interface shear viscosity corresponding to each simulated produced water, and taking the reference polymer concentration and the reference surfactant concentration of the target simulated produced water as the polymer concentration and the surfactant concentration of the on-site produced water. According to the characteristics of different interfacial activities of the polymer and the surfactant, the target simulated produced water with the minimum difference is screened out by comparing the difference between the relevant interface parameters (reference interface tension and reference interface shear viscosity) of the simulated oil-water interface system consisting of the simulated produced water and the field produced oil with the relevant interface parameters (standard interface tension and standard interface shear viscosity) of the oil-water interface system consisting of the field produced water and the field produced oil according to the characteristics of different interfacial activities of the polymer and the surfactant, and the polymer concentration and the surfactant concentration of the target simulated produced water are used as the estimated value of the polymer concentration and the surfactant concentration of the field produced water. Compared with other methods for determining the poly-surface residual content, the scheme provides a lower-cost and simpler poly-surface residual quantity estimation method, and has important significance for field engineering application. By the scheme, a convenient and feasible estimation method for the content of the residual polymer and the surfactant in the produced water is provided for field engineering application lacking a physical property measurement means of the produced water.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application, are incorporated in and constitute a part of this application, and are not intended to limit the application. In the drawings:
FIG. 1 shows a flow chart of a method for determining the polymer table residual amount of a produced water of a combination flooding in an embodiment of the present application;
FIG. 2 shows a flow chart of a method for determining the polymer table residual amount of a produced water of a combination flooding in an embodiment of the present application;
FIG. 3 shows a schematic diagram of a polymer meter residual quantity determination apparatus for produced water of compound flooding in an embodiment of the present application;
fig. 4 shows a schematic diagram of a computer device in an embodiment of the application.
Detailed Description
The principles and spirit of the present application will be described with reference to a number of exemplary embodiments. It should be understood that these embodiments are given solely for the purpose of enabling those skilled in the art to better understand and to practice the present application, and are not intended to limit the scope of the present application in any way. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
As will be appreciated by one skilled in the art, embodiments of the present application may be embodied as a system, apparatus, device, method or computer program product. Accordingly, the present disclosure may be embodied in the form of: entirely hardware, entirely software (including firmware, resident software, micro-code, etc.), or a combination of hardware and software.
In consideration of the fact that the existing station lacks a relatively accurate detection and analysis means for the components of the produced liquid, the station has insufficient knowledge on the polymer surface content of the produced liquid, and thus adverse effects on subsequent analysis of the physical properties of the produced liquid and formulation of a treatment process of the produced liquid are caused, the inventor finds through research that the concentrations of the polymer and the surfactant remained in the produced water on site can be estimated according to the characteristics of different interfacial activities of the polymer and the surfactant.
Specifically, the interfacial tension is the sum of the excess free energy of two molecules per unit area of the two substances relative to the same number of molecules in the phase at different liquid interfaces in contact with each other, and is greatly influenced by the surfactant substance. The interfacial shear viscosity is also called interfacial viscosity, which refers to the ability of different liquid interfaces to resist deformation and even damage caused by tangential force, and is greatly influenced by macromolecular substances such as polymers. Studies have shown that salt ions have a significantly lower effect on interfacial tension than surfactants. Therefore, the polymer surface residual quantity in the on-site produced water can be estimated by comparing the change levels of the interfacial tension and the interfacial shear viscosity of the oil-water interface system formed by the composite flooding on-site produced oil and the on-site produced water relative to the oil-water interface system formed by the simulated produced water and the on-site produced oil with the known polymer surface concentration.
Based on the method, the embodiment of the application provides a polymer table residual quantity determination method for the composite flooding produced water. Fig. 1 shows a flow chart of a method for determining the polymer table residual quantity of the produced water of the compound flooding in one embodiment of the present application. Although the present application provides method operational steps or apparatus configurations as illustrated in the following examples or figures, more or fewer operational steps or modular units may be included in the methods or apparatus based on conventional or non-inventive efforts. In the case of steps or structures which do not logically have the necessary cause and effect relationship, the execution sequence of the steps or the module structure of the apparatus is not limited to the execution sequence or the module structure described in the embodiments and shown in the drawings of the present application. When the described method or module structure is applied in an actual device or end product, the method or module structure according to the embodiments or shown in the drawings can be executed sequentially or executed in parallel (for example, in a parallel processor or multi-thread processing environment, or even in a distributed processing environment).
Specifically, as shown in fig. 1, a method for determining a polymer table residual amount of produced water of a compound flooding provided by an embodiment of the present application may include the following steps.
And step S101, acquiring standard interfacial tension, standard interfacial shear viscosity and injection concentration of a polymer and a surfactant used in the on-site compound flooding.
Compound flooding may include binary compound flooding and ternary compound flooding. Wherein, the binary combination flooding refers to a technology for improving the oil recovery rate by adopting polymers and surfactants. Ternary complex flooding refers to a technique for increasing oil recovery using polymers, surfactants, and alkali. The injection concentrations of polymer and surfactant used in the in situ composite flooding refer to the concentration of polymer and surfactant injected into the reservoir when binary or ternary composite flooding oil recovery techniques are employed in the field. For example, the injection concentrations of the polymer and surfactant used in the in situ composite flood may be stored in a server, from which the injection concentrations of the polymer and surfactant used in the in situ composite flood may be obtained.
The standard interfacial tension is the interfacial tension of a standard oil-water interface system formed by the on-site produced crude oil and the on-site produced water. The interfacial tension is the sum of the excess free energy of two substance molecules per unit area relative to the same number of molecules in the phase on different liquid interfaces in contact with each other. The interfacial tension reflects the magnitude of the Gibbs free energy of the interface, which is energy in nature. The standard interface shear viscosity is the interface shear viscosity of a standard oil-water interface system formed by the on-site produced crude oil and the on-site produced water. The interfacial shear viscosity is also called interfacial viscosity, and refers to the ability of different liquid interfaces to resist deformation and even damage caused by tangential force. The interface shear viscosity is the ability of the oil-water interface to resist the deformation of the interface when the interface is subjected to shear, and is essentially the resistance. The crude oil produced on site refers to crude oil produced by the composite flooding oil production technology on site. The on-site produced water refers to water produced by an on-site compound flooding oil production technology. Polymers and surfactants remain in the field produced water.
For example, the on-site produced crude oil and the on-site produced water may be configured as an oil-water interface system. By measuring the interfacial tension and the interfacial shear viscosity of the oil-water interface system, the standard interfacial tension and the standard interfacial viscosity can be obtained. The measured standard interface tension and the standard interface shear viscosity may be stored in a server, and the standard interface shear viscosity and the standard interface tension may be acquired from the server.
Step S102, determining a plurality of reference polymer concentrations and a plurality of reference surfactant concentrations according to the injection concentrations of the polymer and the surfactant used in the on-site compound flooding.
After the injection concentrations of the polymer and the surfactant used in the in-situ composite flooding are obtained, a plurality of reference polymer concentrations can be determined according to the injection concentrations of the polymer and a plurality of reference surfactant concentrations can be determined according to the injection concentrations of the surfactant. The apparent concentration of the produced water in the field is less than the surface concentration of the injected water. For example, a plurality of reference polymer concentrations equal to or less than the polymer injection concentration may be set, and a plurality of reference surfactant concentrations equal to or less than the surfactant injection concentration may be set. The number of reference polymer concentrations and the number of reference surfactant concentrations may be the same or different.
Step S103, obtaining the interfacial tension and interfacial shear viscosity of a simulated oil-water interface system formed by each simulated produced water in the various simulated produced water and the crude oil produced on site, and obtaining the interfacial tension and interfacial shear viscosity corresponding to each simulated produced water.
Wherein each simulated produced water in the plurality of simulated produced waters is a simulated produced water configured according to each reference polymer concentration in the plurality of reference polymer concentrations and each reference surfactant concentration in the plurality of reference surfactant concentrations. The number of types of simulated produced water is the product of the number of reference surfactant concentrations and the number of reference polymer concentrations. The polymer and the surfactant in each simulated produced water in the various simulated produced water are the polymer and the surfactant adopted in the field composite flooding oil extraction technology.
Exemplary, the plurality of reference polymer concentrations includes: a first reference polymer concentration, a second reference polymer concentration, and a third reference polymer concentration, the plurality of reference surfactant concentrations comprising: a first reference surfactant concentration and a second reference surfactant concentration. Accordingly, the plurality of simulated produced waters comprises: simulated produced water a (where the polymer concentration is a first reference polymer concentration and the surfactant concentration is a first reference surfactant concentration), simulated produced water B (where the polymer concentration is a first reference polymer concentration and the surfactant concentration is a second reference surfactant concentration), simulated produced water C (where the polymer concentration is a second reference polymer concentration and the surfactant concentration is a first reference surfactant concentration), simulated produced water D (where the polymer concentration is a second reference polymer concentration and the surfactant concentration is a second reference surfactant concentration), simulated produced water E (where the polymer concentration is a third reference polymer concentration and the surfactant concentration is a first reference surfactant concentration), and simulated produced water F (where the polymer concentration is a third reference polymer concentration, the surfactant concentration is a second reference surfactant concentration).
The interface tension and the interface shear viscosity of a simulated oil-water interface system formed by each simulated produced water in various simulated produced water and the crude oil produced on site can be obtained, and the interface tension and the interface shear viscosity corresponding to each simulated produced water are obtained. For the binary combination flooding technology, the simulated oil-water interface system is a simulated oil-water interface system formed by various simulated produced water in the simulated produced water and the crude oil produced on site. For the ASP flooding technology, because the simulated oil-water interface system contains alkali, the alkali needs to be added into the simulated oil-water interface system formed by the simulated produced water and the field produced crude oil in various simulated produced water, so as to adjust the pH value of the simulated oil-water interface system to be consistent with the pH value of the field ASP flooding produced liquid, and obtain the simulated oil-water interface system after the pH value is adjusted. For example, the interfacial tension and the interfacial shear viscosity of various simulated oil-water interface systems can be measured, the measured interfacial tension and interfacial shear viscosity are stored in the server, and the interfacial tension and the interfacial shear viscosity corresponding to each simulated produced water can be obtained from the server.
And S104, screening target simulated produced water from the various simulated produced water based on the standard interfacial tension, the standard interfacial shear viscosity and the interfacial tension and the interfacial shear viscosity corresponding to each simulated produced water, and taking the reference polymer concentration and the reference surfactant concentration corresponding to the target simulated produced water as the polymer concentration and the surfactant concentration of the field produced water.
After the standard interfacial tension, the standard interfacial shear viscosity and the interfacial tension and the interfacial shear viscosity corresponding to each simulated produced water are obtained, the target simulated produced water can be screened from the various simulated produced water based on the standard interfacial tension, the standard interfacial shear viscosity and the interfacial tension and the interfacial shear viscosity corresponding to each simulated produced water. Wherein, the screened target simulated produced water is closest to the site simulated produced water. For example, the interface tension corresponding to each simulated produced water may be compared with a standard interface tension, the interface shear viscosity corresponding to each simulated produced water may be compared with a standard interface shear viscosity, a simulated oil-water interface system having an interface characteristic closest to that of an oil-water interface system formed by the field produced water and the field produced oil may be obtained, and the simulated produced water corresponding to the simulated oil-water interface system may be determined as the target simulated produced water. Then, the reference polymer concentration and the reference surfactant concentration corresponding to the target simulated produced water, that is, the polymer concentration and the surfactant concentration of the target simulated produced water, may be used as the polymer concentration and the surfactant concentration of the produced water on site.
In the above embodiment, according to the characteristics of different interfacial activities of the polymer and the surfactant, by comparing the difference between the relevant interface parameters (reference interfacial tension and reference interfacial shear viscosity) of the simulated produced water and the simulated oil-water interface system composed of the field produced oil and the simulated produced water with different polymer surface concentrations and the relevant interface parameters (standard interfacial tension and standard interfacial shear viscosity) of the oil-water interface system composed of the field produced oil and the simulated produced water with different polymer surface concentrations, the target simulated produced water with the smallest difference is screened, and the polymer concentration and the surfactant concentration of the target simulated produced water are used as the estimated value of the polymer surface concentration of the field produced water. Compared with other methods for determining the poly-surface residual content, the scheme provides a lower-cost and simpler poly-surface residual quantity estimation method, and has important significance for field engineering application.
In some embodiments of the present application, for binary combination flooding, obtaining the interfacial tension and the interfacial shear viscosity of a simulated oil-water interface system formed by each simulated produced water in the plurality of simulated produced waters and the in-situ produced crude oil to obtain the interfacial tension and the interfacial shear viscosity corresponding to each simulated produced water may include: configuring polymers, surfactants and deionized water used in the on-site compound flooding into a plurality of simulated produced water according to each reference polymer concentration in the plurality of reference polymer concentrations and each surfactant concentration in the plurality of reference surfactant concentrations, wherein the number of the simulated produced water is the product of the number of the plurality of reference polymer concentrations and the number of the plurality of reference surfactant concentrations; preparing various simulated produced water in the various simulated produced water and the on-site produced crude oil into a simulated oil-water interface system to obtain various simulated oil-water interface systems corresponding to the various simulated produced water; and measuring the interfacial tension and the interfacial shear viscosity of each simulated oil-water interface system in the various simulated oil-water interface systems to obtain the interfacial tension and the interfacial shear viscosity corresponding to each simulated produced water in the various simulated produced water.
In some embodiments of the present application, for triple-displacement, obtaining the interfacial tension and the interfacial shear viscosity of a simulated oil-water interface system formed by each simulated produced water in the plurality of simulated produced waters and the in-situ produced crude oil to obtain the interfacial tension and the interfacial shear viscosity corresponding to each simulated produced water may include: acquiring the pH value of the on-site ASP flooding produced liquid; configuring polymers, surfactants and deionized water used in the on-site compound flooding into a plurality of simulated produced water according to each reference polymer concentration in the plurality of reference polymer concentrations and each surfactant concentration in the plurality of reference surfactant concentrations, wherein the number of the simulated produced water is the product of the number of the plurality of reference polymer concentrations and the number of the plurality of reference surfactant concentrations; preparing various simulated produced water in the various simulated produced water and site produced crude oil into a simulated oil-water interface system, and adding alkali (such as sodium hydroxide or sodium bicarbonate and the like) into the various simulated oil-water interface systems according to the pH value of the site ASP flooding produced liquid so as to adjust the pH value of the simulated oil-water interface system to be consistent with the pH value of the site produced liquid, thereby obtaining various simulated oil-water interface systems corresponding to the various simulated produced water; and measuring the interfacial tension and the interfacial shear viscosity of each simulated oil-water interface system in the various simulated oil-water interface systems to obtain the interfacial tension and the interfacial shear viscosity corresponding to each simulated produced water in the various simulated produced water.
In some embodiments of the present application, measuring the interfacial tension and the interfacial shear viscosity of each of the plurality of simulated oil-water interface systems may include: measuring the interfacial tension of each simulated oil-water interface system in a plurality of simulated oil-water interface systems by adopting a rotary liquid drop method, wherein the measurement temperature is 40 ℃; and/or measuring the interfacial shear viscosity of each simulated oil-water interface system in a plurality of simulated oil-water interface systems by adopting an interfacial shear rheometer, wherein the measurement temperature is 40 ℃.
In some embodiments of the present application, determining a plurality of reference polymer concentrations and a plurality of reference surfactant concentrations from injection concentrations of polymer and surfactant used in an in situ composite flooding may include: taking the injection concentration of the polymer used in the on-site compound flooding as the maximum reference polymer concentration, and taking the injection concentration of the surfactant used in the on-site compound flooding as the maximum reference surfactant concentration; determining a minimum reference polymer concentration and a minimum reference surfactant concentration to be zero; the maximum reference polymer concentration, the minimum reference polymer concentration, and several polymer concentrations between the maximum reference polymer concentration and the minimum reference polymer concentration are taken as a plurality of reference polymer concentrations, and the maximum reference surfactant concentration, the minimum reference surfactant concentration, and several surfactant concentrations between the maximum reference surfactant concentration and the minimum reference surfactant concentration are taken as a plurality of reference surfactant concentrations.
Specifically, the injection concentration of the polymer may be set as a maximum reference polymer concentration, and the injection concentration of the surfactant may be set as a maximum reference surfactant concentration. The minimum polymer concentration and the minimum reference surfactant concentration may be set to 0. The maximum reference polymer concentration, the minimum polymer concentration, and several polymer concentrations between the maximum and minimum reference polymer concentrations are taken as the plurality of reference polymer concentrations. For example, where the infusion concentration of the polymer used in the field is 1000mg/L, then a plurality of reference polymer concentrations can be set as: 0mg/L, 1mg/L, 10mg/L, 100mg/L and 1000 mg/L. For example, where the injection concentration of the surfactant used in the field is 100mg/L, then a plurality of reference surfactant concentrations can be set as: 0mg/L, 0.1mg/L, 0.4mg/L, 1mg/L, 4mg/L, 10mg/L, 40mg/L and 100 mg/L.
The method of determining the plurality of reference polymer concentrations and the plurality of reference surfactant concentrations in the above embodiments is merely exemplary, and the present application is not limited thereto. In other embodiments, for example, the maximum reference polymer concentration may be set to 70%, 80%, or 90% of the polymer injection concentration, etc., and the minimum reference polymer concentration may be set to 1%, 2%, or 5% of the polymer injection concentration, etc. Thereafter, the maximum polymer concentration, the minimum polymer concentration, and a number of polymer concentrations between the maximum reference polymer concentration and the minimum reference polymer concentration may be taken as the plurality of reference polymer concentrations. For example, the maximum reference surfactant concentration may be set to 70%, 80%, or 90% of the surfactant injection concentration, etc., and the minimum reference surfactant concentration may be set to 1%, 2%, or 5% of the surfactant injection concentration, etc. Thereafter, the maximum surfactant concentration, the minimum surfactant concentration, and a number of surfactant concentrations between the maximum reference surfactant concentration and the minimum reference surfactant concentration may be used as the plurality of reference surfactant concentrations.
In some embodiments of the present application, screening a target simulated produced water from a plurality of simulated produced waters based on a standard interfacial tension, a standard interfacial shear viscosity, and an interfacial tension and an interfacial shear viscosity corresponding to each simulated produced water may include: calculating tension difference values between the interface tension corresponding to each simulated produced water and the standard interface tension to obtain a plurality of tension difference values; determining the simulated produced water corresponding to a first preset number of tension difference values with the smallest absolute value in the tension difference values as first simulated produced water to obtain first simulated produced water with a first preset number; calculating viscosity difference values between the interface shear viscosity and the standard interface shear viscosity corresponding to each simulated produced water in the first simulated produced water of the first preset number to obtain viscosity difference values of the first preset number; and determining the simulated produced water corresponding to the viscosity difference value with the minimum absolute value in the first preset number of viscosity difference values as target simulated produced water.
The tension difference between the interfacial tension corresponding to each simulated produced water and the standard interfacial tension can be calculated to obtain a plurality of tension differences. The simulated produced water corresponding to the tension difference value of the first preset number with the smallest absolute value among the tension difference values can be determined as the first simulated produced water, and the first simulated produced water of the first preset number is obtained. Wherein, the first preset number can be preset. For example, 3, 4, or 5, etc. may be provided. The first preset number can also be set according to the number of the simulated produced water. For example, it may be set to simulate 10%, 15% or 20% of the produced water count. Then, the viscosity difference value between the interface shear viscosity corresponding to each simulated produced water in the first simulated produced water of the first preset number and the standard interface shear viscosity can be calculated to obtain the viscosity difference value of the first preset number. And determining the simulated produced water corresponding to the viscosity difference value with the minimum absolute value in the first preset number of viscosity difference values as target simulated produced water. Namely, in the above scheme, several groups of simulated produced water with the smallest difference are selected according to the difference between the reference interfacial tension and the standard interfacial tension, and then the differences between the interfacial shear viscosities corresponding to the screened groups of simulated produced water and the standard shear viscosities are compared, and the simulated produced water with the smallest difference is determined as the target simulated produced water. The interface tension reflects the magnitude of Gibbs free energy of the interface, and the essence is energy, and can represent the integral property of an oil-water interface system, while the interface shear viscosity reflects the capability of resisting the deformation of the interface when the oil-water interface is subjected to the shear action, and the essence is resistance, and represents the local property of the oil-water interface system. Therefore, comparing the difference between interfacial tensions and then the difference between shear viscosities can improve the accuracy of the determined polymer concentration and can effectively reduce errors.
In some embodiments of the present application, determining the simulated produced water corresponding to a first preset number of tension difference values with a smallest absolute value among the plurality of tension difference values as the first simulated produced water may include: judging whether the absolute value of the tension difference values of a first preset number with the minimum absolute value in the tension difference values is smaller than a first preset threshold value or not; and under the condition that the absolute value of the tension difference values of the first preset number with the smallest absolute value in the tension difference values is judged to be smaller than a first preset threshold value, determining the simulated produced water corresponding to the tension difference values of the first preset number as first simulated produced water.
Specifically, before the simulated produced water corresponding to the first preset number of tension difference values with the smallest absolute value among the plurality of tension difference values is determined as the first simulated produced water, it may be determined whether the absolute value of the first preset number of tension difference values with the smallest absolute value among the plurality of tension difference values is smaller than a first preset threshold value. The first preset threshold value can be set according to actual conditions. And determining the simulated produced water corresponding to the tension difference values of the first preset number as first simulated produced water under the condition that the absolute values of the tension difference values of the first preset number are all smaller than a first preset threshold value. By means of the method, the first simulated produced water screened out can be ensured to be closer to the field produced water, so that the surface concentration of the target produced water screened out from the first simulated produced water is closer to the surface concentration of the field produced water, and the accuracy of the determined surface concentration can be improved.
In some embodiments of the present application, in a case where it is determined that one of the absolute values of the tension difference values of the first preset number is not less than the first preset threshold, which indicates that the error of the interfacial tension is large, since the interfacial tension is greatly affected by the surfactant substance, the plurality of reference surfactant concentrations may be re-determined. Thereafter, the plurality of simulated produced waters may be reconfigured according to the plurality of reference polymer concentrations and the plurality of reference surfactant concentrations that are re-determined, and interfacial tension and interfacial shear viscosity corresponding to the reconfigured plurality of simulated produced waters may be obtained. And based on the standard interfacial tension, the standard interfacial shear viscosity and the interfacial tension and the interfacial shear viscosity corresponding to the reconfigured various simulated produced water, re-screening the target simulated produced water from the reconfigured various simulated produced water, and determining the polymer concentration and the surfactant concentration corresponding to the re-screened target simulated produced water as the polymer concentration and the surfactant concentration of the field produced water. In some embodiments, the maximum reference surfactant concentration and the minimum reference surfactant concentration may be re-determined according to the positive and negative and the change law of the plurality of tension difference values, thereby re-determining the plurality of reference surfactant concentrations.
Through the mode, under the condition that the interface tension error is large through analysis, the concentrations of the multiple reference surfactants are determined again, the multiple simulated produced water is reconfigured, the interface tension and the interface shear viscosity of the reconfigured multiple simulated produced water are obtained, and the target simulated produced water is screened out again from the reconfigured multiple simulated produced water based on the standard interface tension, the standard interface shear viscosity and the interface tension and the interface shear viscosity corresponding to the reconfigured multiple simulated produced water, so that the more accurate surface concentration of the field produced water is determined, and the accuracy of surface concentration estimation can be effectively improved. It is understood that the reference surfactant concentration may be refined stepwise based on the above manner to improve the accuracy of the estimation stepwise.
In some embodiments of the present application, determining the simulated produced water corresponding to the viscosity difference value with the smallest absolute value among the first preset number of viscosity difference values as the target simulated produced water may include: judging whether the absolute value of the viscosity difference value with the minimum absolute value in the viscosity difference values of the first preset number is smaller than a second preset threshold value or not; and under the condition that the absolute value of the viscosity difference value with the minimum absolute value in the first preset number of viscosity difference values is judged to be smaller than a second preset threshold value, determining the simulated produced water corresponding to the viscosity difference value with the minimum absolute value in the first preset number of viscosity difference values as target simulated produced water.
Specifically, before the simulated produced water corresponding to the viscosity difference value with the smallest absolute value among the first preset number of viscosity difference values is determined as the target simulated produced water, it may be determined whether the absolute value of the viscosity difference value with the smallest absolute value among the first preset number of viscosity difference values is smaller than a second preset threshold value. Wherein, the second preset threshold value can be set according to the actual situation. And under the condition that the absolute value of the viscosity difference value with the minimum absolute value in the first preset number of viscosity difference values is judged to be smaller than a second preset threshold value, determining the simulated produced water corresponding to the viscosity difference value with the minimum absolute value in the first preset number of viscosity difference values as target simulated produced water. By the mode, the screened target simulated produced water is closer to the field produced water, so that the surface concentration of the target simulated produced water is closer to the surface concentration of the field produced water, and the accuracy of the determined surface concentration can be improved.
In some embodiments of the present application, when it is determined that the absolute value of the viscosity difference value with the smallest absolute value among the first preset number of viscosity difference values is smaller than the second preset threshold, it indicates that the error of the interface shear viscosity is large, and since the interface shear viscosity is greatly influenced by the polymer substance, the concentrations of the plurality of reference polymers may be determined again. Thereafter, the plurality of simulated produced waters may be reconfigured according to the plurality of reference surfactant concentrations and the plurality of reference polymer concentrations that are re-determined, and interfacial tension and interfacial shear viscosity corresponding to the reconfigured plurality of simulated produced waters may be obtained. And based on the standard interfacial tension, the standard interfacial shear viscosity and the interfacial tension and the interfacial shear viscosity corresponding to the reconfigured various simulated produced water, re-screening the target simulated produced water from the reconfigured various simulated produced water, and determining the polymer concentration and the surfactant concentration corresponding to the re-screened target simulated produced water as the polymer concentration and the surfactant concentration of the field produced water. In some embodiments, the maximum reference polymer concentration and the minimum reference polymer concentration may be re-determined based on the positive and negative and the variation law of the plurality of viscosity differences, thereby re-determining the plurality of reference polymer concentrations.
Through the mode, under the condition that the shear viscosity error obtained through analysis is large, the multiple kinds of simulated produced water are reconfigured by re-determining the concentrations of the multiple reference polymers, the interface tension and the interface shear viscosity of the reconfigured multiple kinds of simulated produced water are obtained again, and the target simulated produced water is screened out again from the reconfigured multiple kinds of simulated produced water based on the standard interface tension, the standard interface shear viscosity and the interface tension and the interface shear viscosity corresponding to the reconfigured multiple kinds of simulated produced water, so that the more accurate surface concentration of the field produced water is determined, and the accuracy of surface concentration estimation can be effectively improved. It is understood that the reference polymer concentration may be refined stepwise based on the above manner to improve the accuracy of the estimation stepwise.
By the method in the embodiment, the reference surfactant concentration and the reference polymer concentration can be gradually refined, so that the interface characteristic of the screened target simulated produced water is closer to the interface characteristic of the field produced water, and the determined polymer concentration and surfactant concentration of the field produced water are more accurate.
In some embodiments of the present application, screening a target simulated produced water from a plurality of simulated produced waters based on a standard interfacial tension, a standard interfacial shear viscosity, and an interfacial tension and an interfacial shear viscosity corresponding to each simulated produced water may include: calculating viscosity difference values between the interface shear viscosity corresponding to each simulated produced water and the standard interface shear viscosity to obtain a plurality of viscosity difference values; determining the simulated produced water corresponding to a second preset number of viscosity difference values with the smallest absolute value in the plurality of viscosity difference values as second simulated produced water to obtain second simulated produced water with a second preset number; calculating a tension difference value between the interface tension corresponding to each simulated produced water in a second preset number of second simulated produced water and the standard interface tension to obtain a tension difference value of a second preset number; and determining the simulated produced water corresponding to the tension difference value with the minimum absolute value in the tension difference values of the second preset number as the target simulated produced water.
Specifically, the viscosity difference between the interface shear viscosity corresponding to each simulated produced water and the standard interface shear viscosity can be calculated to obtain a plurality of viscosity differences. The simulated produced water corresponding to the second preset number of viscosity difference values with the smallest absolute value among the plurality of viscosity difference values can be determined as second simulated produced water, and the second simulated produced water with the second preset number is obtained. Wherein the second preset number may be preset. For example, 8, 9, 10, etc. may be provided. The first preset number can also be set according to the number of the simulated produced water. For example, it may be set to simulate 20%, 25% or 30% of the number of produced waters. Then, a tension difference value between the standard interface tension and the interface tension corresponding to each of the second simulated produced water of the second preset number can be calculated to obtain a tension difference value of the second preset number. And determining the simulated produced water corresponding to the tension difference value with the minimum absolute value in the tension difference values of the second preset number as the target simulated produced water. Namely, in the above scheme, several groups of simulated produced water with the smallest difference are selected according to the difference between the reference interfacial shear viscosity and the standard interfacial shear viscosity, and then the differences between the interfacial tensions corresponding to the screened groups of simulated produced water and the standard interfacial tension are compared, and the simulated produced water with the smallest difference is determined as the target simulated produced water. By the method, the target simulation produced water close to the field produced water can be screened out, so that the surface concentration of polymer in the field produced water can be estimated.
In some embodiments of the present application, screening a target simulated produced water from a plurality of simulated produced waters based on a standard interfacial tension, a standard interfacial shear viscosity, and an interfacial tension and an interfacial shear viscosity corresponding to each simulated produced water may include: calculating a tension relative difference value between the interface tension corresponding to each simulated produced water and the standard interface tension and a viscosity relative difference value between the interface shear viscosity corresponding to each simulated produced water and the standard interface shear viscosity to obtain a tension relative difference value and a viscosity relative difference value corresponding to each simulated produced water; acquiring a preset total relative difference model, and obtaining a total relative difference corresponding to each simulated produced water based on the preset total relative difference model, and the corresponding tension relative difference and viscosity relative difference of each simulated produced water; and determining the simulated produced water corresponding to the minimum total relative difference value in the total relative difference values corresponding to the simulated produced water as the target simulated produced water.
Specifically, the tension relative difference between the interfacial tension and the standard interfacial tension corresponding to each simulated produced water and the viscosity relative difference between the interfacial shear viscosity and the standard interfacial shear viscosity corresponding to each simulated produced water can be calculated to obtain the tension relative difference and the viscosity relative difference corresponding to each simulated produced water. Wherein, the tension relative difference value can be obtained by dividing the absolute value of the difference between the interface tension corresponding to each simulated produced water and the standard interface tension by the standard interface tension. Wherein, the relative viscosity difference value can be obtained by dividing the absolute value of the difference between the interface shear viscosity corresponding to each simulated produced water and the standard interface shear viscosity by the standard interface shear viscosity. A preset total relative difference model may be obtained. Wherein, the total relative difference model comprises the functional relationship between the total relative difference and the tension relative difference and the viscosity relative difference. The total relative difference model may be pre-established based on actual data. For example, the total relative difference model may be of the form: e ═ aE1+ bE2, where E is the total relative difference, E1 is the tension relative difference, E2 is the viscosity relative difference, and a and b are constants. The form of the above-described total relative difference model is merely exemplary, and the present application is not limited thereto.
The total relative difference value corresponding to each simulated produced water can be obtained based on a preset total relative difference value model, and the tension relative difference value and the viscosity relative difference value corresponding to each simulated produced water. Then, the simulated produced water corresponding to the minimum total relative difference value among the total relative difference values corresponding to the simulated produced water can be determined as the target simulated produced water. Through the mode, the target simulated produced water can be screened from various simulated produced water based on the preset total relative difference value model, the standard interfacial tension, the standard interfacial shear viscosity and the interfacial tension and the interfacial shear viscosity corresponding to each simulated produced water.
The above method is described below with reference to a specific example, however, it should be noted that the specific example is only for better describing the present application and is not to be construed as limiting the present application.
In this embodiment, a binary combination flooding is taken as an example to illustrate the method for determining the polymer table residual amount of the combination flooding produced water. Referring to fig. 2, a flow chart of a method for determining the polymer table residual amount of produced water of binary combination flooding in the present embodiment is shown. As shown in fig. 2, the method for determining the polymer table residual amount of the produced water of the binary combination flooding in this embodiment may include the following steps.
Step 1, taking 1 part of produced water and 1 part of crude oil which adopt on-site binary combination flooding, and configuring the produced water and the crude oil into an oil-water interface system; measuring the interfacial tension of an oil-water interface system by adopting a rotary liquid drop method, injecting 1.5ml of produced water into a sample loading pipe to be used as external phase liquid, and injecting 1.5 mu L of crude oil into the sample loading pipe to be used as internal phase liquid; and sealing the sample containing tube, placing the sample containing tube in a measuring chamber of an interfacial tension meter, adjusting the temperature in the measuring chamber to 40 ℃, and increasing the rotating speed of a motor of the interfacial tension meter to 7000 r/min. Observing the change of the interfacial tension of the display window, if the interfacial tension is not obviously changed after being kept for 30 minutes, considering that the interfacial tension is the stable value of the oil-water interface tension, which is recorded as 23.2mN/m in the embodiment, and taking gamma as0And the standard value of the oil-water interfacial tension of the residual binary composite flooding produced fluid on the evaluation site is used.
Step 2, preparing 1 part of produced water and 1 part of crude oil which adopt the on-site binary combined flooding into an oil-water interface system, measuring the interface shear viscosity of the oil-water interface system by adopting a DWR interface rheometer, and sequentially adding 18.8mL of produced water and 10mL of crude oil into a copper bath; the test temperature was preset at 40 ℃ for 15 minutes. Measuring the shear viscosity of the oil-water interface, recording as the value in the embodiment of 2.931mN · s/cm, and taking the value as the standard value of the shear viscosity of the oil-water interface of the residual binary composite flooding produced fluid on the evaluation site.
And 3, taking 28 parts of deionized water and 28 parts of field dehydrated crude oil respectively, dividing the deionized water into 4 groups, adding 7 parts of each group, adding polymers HPAM with different concentrations into different groups, adding betaine surfactants with different concentrations into each group to prepare simulated produced water, wherein the serial number of each simulated produced water is set as M (i, j), and the prepared concentration is shown in Table 1.
TABLE 1
Step 4, respectively mixing the 28 parts of simulated produced water withPreparing 28 parts of simulated oil-water interface system from the crude oil subjected to field dehydration; the interfacial tension of the 28 parts simulated oil-water interfacial system was measured by a rotary drop interfacial tension method, the oil-water interfacial tension under the produced water conditions of different polymer surface concentrations is shown in table 2, and the unit of the interfacial tension data is mN/m. The interfacial tension measurement is recorded as γ1(i, j), wherein i is the polymer concentration number (1. ltoreq. i.ltoreq.4), and j is the surfactant concentration number (1. ltoreq. j.ltoreq.4).
TABLE 2
Step 5, taking 28 parts of the simulated produced water prepared in the step 3, and combining each part of the simulated produced water and the in-situ dehydrated crude oil to form a simulated oil-water interface system to obtain 28 parts of the simulated oil-water interface system; the interface shear viscosity of the oil-water 28 parts interface system is measured by a DWR interface rheometer, the oil-water interface shear viscosity under the conditions of the produced water with different polymer surface concentrations is shown in table 3, and the interface shear viscosity data unit is mN · s/cm. The measured interfacial shear viscosity is recorded as eta1(i, j), wherein i is the polymer concentration number (1. ltoreq. i.ltoreq.4), and j is the surfactant concentration number (1. ltoreq. j.ltoreq.4).
TABLE 3
Step 6, subjecting the interface tension standard value gamma of the binary composite flooding produced liquid0And the measured value gamma of the oil-water interfacial tension under different concentration1(i, j) calculating the error respectively, wherein the error calculation formula is | gamma1(i，j)＝γ0I, screening out 3 simulated produced water with the minimum error, and obtaining gamma according to the step 10The numbers of the screened simulated produced water are M (1,2), M (2,2) and M (3,2), and are shown in the bold part in Table 2.
Step 7, subjecting the interface shear viscosity standard value eta of the binary composite flooding produced liquid0Corresponding to the 3 simulated produced water screened in the step 10Measured value of shear viscosity η1(i, j) calculating the error by the equation of | η |, respectively1(i，j)-η0I, screening out 1 simulated produced water with the minimum error, and obtaining eta according to the step 20The screened simulated produced water is assigned the serial number M (1,2), as shown in the bold portion of table 3.
And 8, taking the apparent concentration of the simulated produced water screened in the step 7 as a predicted value of the apparent concentration of the produced water in the binary composite flooding field, namely, the polymer residual concentration is about 0.4mg/L and the surfactant residual concentration is about 10 mg/L.
In the above specific embodiment, the error of the estimated polymer concentration is 0.5%, and the error of the surfactant concentration is 2.5%, so that the accuracy of the method for estimating the residual polymer surface concentration of the produced water in this embodiment is high. According to the determination method in the embodiment, according to the characteristics of different interfacial activities of the polymer and the surfactant, by comparing the difference between the relevant interface parameters (reference interface tension and reference interface shear viscosity) of the simulated produced water and the simulated oil-water interface system consisting of the field produced oil, which contain different polymer surface concentrations, and the relevant interface parameters (standard interface tension and standard interface shear viscosity) of the oil-water interface system consisting of the field produced oil and the field produced water, the target simulated produced water with the minimum difference is screened, and the polymer concentration and the surfactant concentration of the target simulated produced water are used as the pre-estimated value of the polymer surface concentration of the field produced water. Compared with other methods for determining the poly-surface residual content, the scheme provides a lower-cost and simpler poly-surface residual quantity estimation method, and has important significance for field engineering application. By the scheme, a convenient and feasible estimation method for the content of the residual polymer and the surfactant in the produced water is provided for field engineering application lacking a physical property measurement means of the produced water.
Based on the same inventive concept, the embodiment of the application also provides a polymer table residual quantity determination device of the composite flooding produced water, which is described in the following embodiment. The principle of solving the problems of the polymer table residual quantity determining device of the composite flooding produced water is similar to the polymer table residual quantity determining method of the composite flooding produced water, so the implementation of the polymer table residual quantity determining device of the composite flooding produced water can refer to the implementation of the polymer table residual quantity determining method of the composite flooding produced water, and repeated parts are not repeated. As used hereinafter, the term "unit" or "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated. Fig. 3 is a block diagram of a configuration of an apparatus for determining a polymer table residual amount of produced water from a compound flooding system according to an embodiment of the present application, as shown in fig. 3, including: a first obtaining module 301, a determining module 302, a second obtaining module 303, and a screening module 304, which are described below.
The first obtaining module 301 is configured to obtain a standard interfacial tension, a standard interfacial shear viscosity, and injection concentrations of a polymer and a surfactant used in the field combination flooding, where the standard interfacial tension and the standard interfacial shear viscosity are an interfacial tension and an interfacial shear viscosity of a standard oil-water interface system formed by the field produced crude oil and the field produced water, respectively.
The determination module 302 is configured to determine a plurality of reference polymer concentrations and a plurality of reference surfactant concentrations based on the injection concentrations of the polymer and the surfactant used in the in situ composite flooding.
The second obtaining module 303 is configured to obtain an interfacial tension and an interfacial shear viscosity of a simulated oil-water interface system formed by each simulated produced water in the plurality of simulated produced waters and the in-situ produced crude oil, and obtain an interfacial tension and an interfacial shear viscosity corresponding to each simulated produced water, where each simulated produced water is a simulated produced water configured according to each reference polymer concentration in the plurality of reference polymer concentrations and each reference surfactant concentration in the plurality of reference surfactant concentrations.
The screening module 304 is configured to screen out target simulated produced water from the plurality of simulated produced water based on the standard interfacial tension, the standard interfacial shear viscosity, and the interfacial tension and the interfacial shear viscosity corresponding to each simulated produced water, and use a reference polymer concentration and a reference surfactant concentration corresponding to the target simulated produced water as a polymer concentration and a surfactant concentration of the field produced water.
In some embodiments of the present application, the determining module may be specifically configured to: taking the injection concentration of the polymer used in the on-site compound flooding as the maximum reference polymer concentration, and taking the injection concentration of the surfactant used in the on-site compound flooding as the maximum reference surfactant concentration; determining a minimum reference polymer concentration and a minimum reference surfactant concentration to be zero; the maximum reference polymer concentration, the minimum reference polymer concentration, and several polymer concentrations between the maximum reference polymer concentration and the minimum reference polymer concentration are taken as a plurality of reference polymer concentrations, and the maximum reference surfactant concentration, the minimum reference surfactant concentration, and several surfactant concentrations between the maximum reference surfactant concentration and the minimum reference surfactant concentration are taken as a plurality of reference surfactant concentrations.
In some embodiments of the present application, the screening module may be specifically configured to: calculating tension difference values between the interface tension corresponding to each simulated produced water and the standard interface tension to obtain a plurality of tension difference values; determining the simulated produced water corresponding to a first preset number of tension difference values with the smallest absolute value in the tension difference values as first simulated produced water to obtain first simulated produced water with a first preset number; calculating viscosity difference values between the interface shear viscosity and the standard interface shear viscosity corresponding to each simulated produced water in the first simulated produced water of the first preset number to obtain viscosity difference values of the first preset number; and determining the simulated produced water corresponding to the viscosity difference value with the minimum absolute value in the first preset number of viscosity difference values as target simulated produced water.
In some embodiments of the present application, determining the simulated produced water corresponding to a first preset number of tension difference values with a smallest absolute value among the plurality of tension difference values as the first simulated produced water may include: judging whether the absolute value of the tension difference values of a first preset number with the minimum absolute value in the tension difference values is smaller than a first preset threshold value or not; and under the condition that the absolute value of the tension difference values of the first preset number with the smallest absolute value in the tension difference values is judged to be smaller than a first preset threshold value, determining the simulated produced water corresponding to the tension difference values of the first preset number as first simulated produced water.
In some embodiments of the present application, determining, as the target simulated produced water, the simulated produced water corresponding to the viscosity difference value with the smallest absolute value among the first preset number of viscosity difference values may include: judging whether the absolute value of the viscosity difference value with the minimum absolute value in the viscosity difference values of the first preset number is smaller than a second preset threshold value or not; and under the condition that the absolute value of the viscosity difference value with the minimum absolute value in the first preset number of viscosity difference values is judged to be smaller than a second preset threshold value, determining the simulated produced water corresponding to the viscosity difference value with the minimum absolute value in the first preset number of viscosity difference values as target simulated produced water.
In some embodiments of the present application, the screening module may be specifically configured to: calculating viscosity difference values between the interface shear viscosity corresponding to each simulated produced water and the standard interface shear viscosity to obtain a plurality of viscosity difference values; determining the simulated produced water corresponding to a second preset number of viscosity difference values with the smallest absolute value in the plurality of viscosity difference values as second simulated produced water to obtain second simulated produced water with a second preset number; calculating a tension difference value between the interface tension corresponding to each simulated produced water in a second preset number of second simulated produced water and the standard interface tension to obtain a tension difference value of a second preset number; and determining the simulated produced water corresponding to the tension difference value with the minimum absolute value in the tension difference values of the second preset number as the target simulated produced water.
In some embodiments of the present application, the screening module may be specifically configured to: calculating a tension relative difference value between the interface tension corresponding to each simulated produced water and the standard interface tension and a viscosity relative difference value between the interface shear viscosity corresponding to each simulated produced water and the standard interface shear viscosity to obtain a tension relative difference value and a viscosity relative difference value corresponding to each simulated produced water; acquiring a preset total relative difference model, and obtaining a total relative difference corresponding to each simulated produced water based on the preset total relative difference model and the corresponding tension relative difference and viscosity relative difference of each simulated produced water, wherein the total relative difference model comprises a functional relation between the total relative difference and the corresponding tension relative difference and viscosity relative difference; and determining the simulated produced water corresponding to the minimum total relative difference value in the total relative difference values corresponding to the simulated produced water as the target simulated produced water.
From the above description, it can be seen that the embodiments of the present application achieve the following technical effects: according to the characteristics of different interfacial activities of the polymer and the surfactant, the target simulated produced water with the minimum difference is screened out by comparing the difference between the relevant interface parameters (reference interface tension and reference interface shear viscosity) of a simulated oil-water interface system consisting of the simulated produced water and the field produced oil with different polymer surface concentrations and the relevant interface parameters (standard interface tension and standard interface shear viscosity) of the oil-water interface system consisting of the field produced water and the field produced oil, and the polymer concentration and the surfactant concentration of the target simulated produced water are used as the estimated value of the polymer surface concentration of the field produced water. Compared with other methods for determining the poly-surface residual content, the scheme provides a lower-cost and simpler poly-surface residual quantity estimation method, and has important significance for field engineering application. By the scheme, a convenient and feasible estimation method for the content of the residual polymer and the surfactant in the produced water is provided for field engineering application lacking a physical property measurement means of the produced water.
The embodiment of the present application further provides a computer device, which may specifically refer to a schematic structural diagram of a computer device shown in fig. 4 based on the method for determining the polymer table residual amount of the compound flooding produced water provided by the embodiment of the present application, where the computer device may specifically include an input device 41, a processor 42, and a memory 43. Wherein the memory 43 is for storing processor executable instructions. The processor 42, when executing the instructions, implements the steps of the method for determining the polymer table residual amount of the produced water of the compound flooding described in any of the embodiments above.
In this embodiment, the input device may be one of the main apparatuses for information exchange between a user and a computer system. The input device may include a keyboard, a mouse, a camera, a scanner, a light pen, a handwriting input board, a voice input device, etc.; the input device is used to input raw data and a program for processing the data into the computer. The input device can also acquire and receive data transmitted by other modules, units and devices. The processor may be implemented in any suitable way. For example, the processor may take the form of, for example, a microprocessor or processor and a computer-readable medium that stores computer-readable program code (e.g., software or firmware) executable by the (micro) processor, logic gates, switches, an Application Specific Integrated Circuit (ASIC), a programmable logic controller, an embedded microcontroller, and so forth. The memory may in particular be a memory device used in modern information technology for storing information. The memory may include multiple levels, and in a digital system, the memory may be any memory as long as it can store binary data; in an integrated circuit, a circuit without a physical form and with a storage function is also called a memory, such as a RAM, a FIFO and the like; in the system, the storage device in physical form is also called a memory, such as a memory bank, a TF card and the like.
In this embodiment, the functions and effects of the specific implementation of the computer device can be explained in comparison with other embodiments, and are not described herein again.
The embodiment of the application also provides a computer storage medium based on the polymer table residual quantity determination method of the compound flooding produced water, wherein the computer storage medium stores computer program instructions, and the computer program instructions realize the steps of the polymer table residual quantity determination method of the compound flooding produced water in any embodiment when being executed.
In this embodiment, the storage medium includes, but is not limited to, a Random Access Memory (RAM), a Read-Only Memory (ROM), a Cache (Cache), a Hard Disk Drive (HDD), or a Memory Card (Memory Card). The memory may be used to store computer program instructions. The network communication unit may be an interface for performing network connection communication, which is set in accordance with a standard prescribed by a communication protocol.
In this embodiment, the functions and effects specifically realized by the program instructions stored in the computer storage medium can be explained by comparing with other embodiments, and are not described herein again.
It will be apparent to those skilled in the art that the modules or steps of the embodiments of the present application described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different from that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, embodiments of the present application are not limited to any specific combination of hardware and software.
It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the application should, therefore, be determined not with reference to the above description, but instead should be determined with reference to the pending claims along with the full scope of equivalents to which such claims are entitled.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and it will be apparent to those skilled in the art that various modifications and variations can be made in the embodiment of the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A polymer table residual quantity determination method of compound flooding produced water is characterized by comprising the following steps:
acquiring standard interface tension, standard interface shear viscosity and injection concentration of a polymer and a surfactant used in on-site compound flooding, wherein the standard interface tension and the standard interface shear viscosity are respectively the interface tension and the interface shear viscosity of a standard oil-water interface system formed by on-site produced crude oil and on-site produced water;
determining a plurality of reference polymer concentrations and a plurality of reference surfactant concentrations from the injected concentrations of polymer and surfactant used in the in situ composite flooding;
obtaining the interfacial tension and interfacial shear viscosity of a simulated oil-water interface system formed by each simulated produced water and the on-site produced crude oil in the plurality of simulated produced water to obtain the interfacial tension and interfacial shear viscosity corresponding to each simulated produced water, wherein each simulated produced water is the simulated produced water configured according to each reference polymer concentration in the plurality of reference polymer concentrations and each reference surfactant concentration in the plurality of reference surfactant concentrations;
and screening target simulated produced water from the various simulated produced water based on the standard interfacial tension, the standard interfacial shear viscosity and the interfacial tension and the interfacial shear viscosity corresponding to each simulated produced water, and taking the reference polymer concentration and the reference surfactant concentration corresponding to the target simulated produced water as the polymer concentration and the surfactant concentration of the on-site produced water, wherein the target simulated produced water is the simulated produced water with the smallest difference between the various simulated produced water and the on-site produced water.
2. The method of claim 1, wherein determining a plurality of reference polymer concentrations and a plurality of reference surfactant concentrations from the injected concentrations of polymer and surfactant used in the in situ compounding drive comprises:
taking the injection concentration of the polymer used in the in-situ compound flooding as a maximum reference polymer concentration and taking the injection concentration of the surfactant used in the in-situ compound flooding as a maximum reference surfactant concentration;
determining a minimum reference polymer concentration and a minimum reference surfactant concentration to be zero;
taking the maximum reference polymer concentration, the minimum reference polymer concentration, and a number of polymer concentrations between the maximum reference polymer concentration and the minimum reference polymer concentration as the plurality of reference polymer concentrations, and taking the maximum reference surfactant concentration, the minimum reference surfactant concentration, and a number of surfactant concentrations between the maximum reference surfactant concentration and the minimum reference surfactant concentration as the plurality of reference surfactant concentrations.
3. The method of claim 1, wherein screening the plurality of simulated produced waters for a target simulated produced water based on the standard interfacial tension, the standard interfacial shear viscosity, and the interfacial tension and interfacial shear viscosity corresponding to each simulated produced water comprises:
calculating tension difference values between the interface tension corresponding to each simulated produced water and the standard interface tension to obtain a plurality of tension difference values;
determining the simulated produced water corresponding to a first preset number of tension difference values with the smallest absolute value in the plurality of tension difference values as first simulated produced water to obtain first simulated produced water with a first preset number;
calculating the viscosity difference value between the interface shear viscosity corresponding to each simulated produced water in the first preset number of first simulated produced water and the standard interface shear viscosity to obtain the viscosity difference value of the first preset number;
and determining the simulated produced water corresponding to the viscosity difference value with the minimum absolute value in the first preset number of viscosity difference values as target simulated produced water.
4. The method of claim 3, wherein determining the simulated produced water corresponding to the first preset number of tension difference values with the smallest absolute value among the plurality of tension difference values as the first simulated produced water comprises:
judging whether the absolute value of the tension difference values of a first preset number with the minimum absolute value in the tension difference values is smaller than a first preset threshold value or not;
and under the condition that the absolute value of the tension difference value of the first preset number with the smallest absolute value in the tension difference values is judged to be smaller than a first preset threshold value, determining the simulated produced water corresponding to the tension difference value of the first preset number as first simulated produced water.
5. The method according to claim 3 or 4, wherein determining the simulated produced water corresponding to the viscosity difference value with the smallest absolute value in the first preset number of viscosity difference values as the target simulated produced water comprises:
judging whether the absolute value of the viscosity difference value with the minimum absolute value in the viscosity difference values of the first preset number is smaller than a second preset threshold value or not;
and under the condition that the absolute value of the viscosity difference value with the minimum absolute value in the first preset number of viscosity difference values is judged to be smaller than a second preset threshold value, determining the simulated produced water corresponding to the viscosity difference value with the minimum absolute value in the first preset number of viscosity difference values as target simulated produced water.
6. The method of claim 1, wherein screening the plurality of simulated produced waters for a target simulated produced water based on the standard interfacial tension, the standard interfacial shear viscosity, and the interfacial tension and interfacial shear viscosity corresponding to each simulated produced water comprises:
calculating viscosity difference values between the interface shear viscosity corresponding to each simulated produced water and the standard interface shear viscosity to obtain a plurality of viscosity difference values;
determining the simulated produced water corresponding to a second preset number of viscosity difference values with the smallest absolute value in the plurality of viscosity difference values as second simulated produced water to obtain second simulated produced water with a second preset number;
calculating a tension difference value between the interface tension corresponding to each simulated produced water in the second simulated produced water of the second preset number and the standard interface tension to obtain a tension difference value of the second preset number;
and determining the simulated produced water corresponding to the tension difference value with the minimum absolute value in the tension difference values of the second preset number as target simulated produced water.
7. The method of claim 1, wherein screening the plurality of simulated produced waters for a target simulated produced water based on the standard interfacial tension, the standard interfacial shear viscosity, and the interfacial tension and interfacial shear viscosity corresponding to each simulated produced water comprises:
calculating a tension relative difference value between the interface tension corresponding to each simulated produced water and the standard interface tension and a viscosity relative difference value between the interface shear viscosity corresponding to each simulated produced water and the standard interface shear viscosity to obtain a tension relative difference value and a viscosity relative difference value corresponding to each simulated produced water;
obtaining a preset total relative difference model, and obtaining a total relative difference corresponding to each simulated produced water based on the preset total relative difference model and the corresponding tension relative difference and viscosity relative difference of each simulated produced water, wherein the total relative difference model comprises a functional relation between the total relative difference and the corresponding tension relative difference and viscosity relative difference;
and determining the simulated produced water corresponding to the minimum total relative difference value in the total relative difference values corresponding to the simulated produced water as the target simulated produced water.
8. A polymer table residual quantity determination device of compound flooding produced water is characterized by comprising:
the system comprises a first acquisition module, a second acquisition module and a third acquisition module, wherein the first acquisition module is used for acquiring standard interfacial tension, standard interfacial shear viscosity and injection concentration of a polymer and a surfactant used in on-site compound flooding, and the standard interfacial tension and the standard interfacial shear viscosity are respectively the interfacial tension and the interfacial shear viscosity of a standard oil-water interface system formed by on-site produced crude oil and on-site produced water;
a determination module for determining a plurality of reference polymer concentrations and a plurality of reference surfactant concentrations from injection concentrations of polymer and surfactant used in the in situ composite flooding;
the second obtaining module is used for obtaining the interfacial tension and the interfacial shear viscosity of a simulated oil-water interface system formed by each simulated produced water and the on-site produced crude oil in various simulated produced water to obtain the interfacial tension and the interfacial shear viscosity corresponding to each simulated produced water, wherein each simulated produced water is the simulated produced water configured according to each reference polymer concentration in the reference polymer concentrations and each reference surfactant concentration in the reference surfactant concentrations;
and the screening module is used for screening target simulated produced water from the various simulated produced water based on the standard interfacial tension, the standard interfacial shear viscosity and the interfacial tension and the interfacial shear viscosity corresponding to each simulated produced water, and taking the reference polymer concentration and the reference surfactant concentration corresponding to the target simulated produced water as the polymer concentration and the surfactant concentration of the on-site produced water, wherein the target simulated produced water is the simulated produced water with the smallest difference between the various simulated produced water and the on-site produced water.
9. A computer device comprising a processor and a memory for storing processor-executable instructions which, when executed by the processor, implement the steps of the method of any one of claims 1 to 7.
10. A computer-readable storage medium having computer instructions stored thereon which, when executed, implement the steps of the method of any one of claims 1 to 7.
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