CN111581846A

CN111581846A - Device and method for determining residual water content and stability of composite flooding produced liquid

Info

Publication number: CN111581846A
Application number: CN202010446402.XA
Authority: CN
Inventors: 白剑锋; 王智; 朱国承; 张平; 王振威; 王玮; 田鹏; 张园
Original assignee: China National Petroleum Corp; Xian Changqing Technology Engineering Co Ltd
Current assignee: China National Petroleum Corp; Xian Changqing Technology Engineering Co Ltd
Priority date: 2020-05-25
Filing date: 2020-05-25
Publication date: 2020-08-25
Anticipated expiration: 2040-05-25
Also published as: CN111581846B

Abstract

The invention discloses a device and a method for determining residual water content and stability of a composite flooding produced fluid, which comprises the following steps of 1) obtaining a target polymer surface concentration and a target residual water content model of a target produced fluid, wherein the target polymer surface concentration comprises the concentration of a target polymer and the concentration of a target surfactant, and the target residual water content model comprises the functional relation between the residual water content and the polymer surface concentration of the produced fluid; and 2) determining the residual water content of the target produced liquid according to the target surface concentration and the target residual water content model in the step 1). The method provided by the invention is simple and convenient to operate, can provide theoretical guidance for further treatment and gathering of the produced liquid, solves the technical problem that the dehydration rate of the target produced liquid is lack in prediction in the prior art, and achieves the technical problem of simply and conveniently predicting the dehydration rate of the target produced liquid.

Description

Device and method for determining residual water content and stability of composite flooding produced liquid

Technical Field

The invention belongs to the technical field of treatment and gathering of compound flooding produced liquid, and particularly relates to a device and a method for determining residual water content and stability of compound flooding produced liquid.

Background

With the aging of tertiary oil recovery technology, the compound flooding oil recovery technology is increasingly applied to the recovery efficiency increasing work of each large oil field. The compound flooding is rapidly developed in the eight and ninety years of the last century, the recovery ratio of the current compound flooding is averagely improved by 20 percent compared with that of water flooding, and the recovery increasing capability of the compound flooding is further improved along with the research and development of a novel polymer and surfactant flooding system.

Although the use of the compound flooding obtains considerable yield increase benefits, due to the components such as polymers, surfactants, 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 liquid system is complicated, the dehydration difficulty of the crude oil emulsion is remarkably improved, and the compound flooding also brings challenges to the gathering and transportation process of the produced liquid. Higher viscosity and greater emulsion stability will increase the energy consumption of the gathering and transportation and place higher demands on the life of the field device. Therefore, the research on the water content and the stability of the produced liquid is an important content in the process of treating and gathering the produced liquid; because the produced fluids at different positions have different water contents, and the produced fluids are applied to different polymers and surfactants or alkalis during production, the water contents are different, the accuracy of the produced fluids is poor through single measurement, and the resource waste is caused; however, there are currently no devices and methods to predict water content of produced fluids. In view of the above problems, no effective solution has been proposed.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, provides a device and a method for determining the residual water content and the stability degree of a composite flooding produced fluid, and overcomes the defects of the prior art that 1: there have been no devices and methods to predict water content of produced fluids; 2: the water content of the produced liquid is not predicted, so that the collection and transportation process of the produced liquid is difficult, the energy consumption is increased, and the service life of field equipment is shortened; 3: the produced liquid in different positions has different water content, and the produced liquid is applied to different polymers and surfactants during the production, so that the produced liquid has different water content, the accuracy is poor through single measurement, and the problems of resource waste and the like are caused.

In order to solve the technical problem, the technical scheme of the invention is as follows: the method for determining the residual water content of the compound flooding produced liquid comprises the following steps:

step 1) obtaining a target polymer surface concentration and a target residual water content model of a target produced fluid, wherein the target polymer surface concentration comprises the concentration of a target polymer and the concentration of a target surfactant, and the target residual water content model comprises a functional relation between the residual water content and the polymer surface concentration of the produced fluid;

and 2) determining the residual water content of the target produced liquid according to the target surface concentration and the target residual water content model in the step 1).

Preferably, the method for establishing the target residual moisture content model comprises the following steps: the method comprises the steps of obtaining interface characteristic data and residual water content data of various simulated oil-water interfaces formed by various simulated produced water and composite flooding produced crude oil corresponding to various preset polymer table concentrations, obtaining interface characteristic data and residual water content data corresponding to the various preset polymer table concentrations, and establishing a target residual water content model based on the various preset polymer table concentrations and the interface characteristic data and residual water content data corresponding to the various preset polymer table concentrations, wherein a polymer and a surfactant selected according to the preset polymer table concentrations are respectively the same as those of a polymer and a surfactant selected according to the target polymer table concentrations, the polymer is selected from polyacrylamide, and the surfactant is selected from betaine surfactants.

Preferably, the interface characteristic data includes interface tension data and interface shear viscosity data, and the target residual water content model is established based on the multiple preset concentration tables and the interface characteristic data and residual water content data corresponding to the multiple preset concentration tables, specifically including:

establishing a first correlation model according to the interfacial tension data corresponding to the various preset concentration table concentrations; establishing a second correlation model according to interface shear viscosity data corresponding to the various preset polymer table concentrations; establishing a third correlation model according to the interfacial tension data, the interfacial shear viscosity data and the residual water content data corresponding to the various preset concentration table concentrations, and determining a target residual water content model based on the first correlation model, the second correlation model and the third correlation model; the first correlation model comprises a functional relation between the interfacial tension change rate and the poly-meter concentration, the second correlation model comprises a functional relation between the interfacial shear viscosity change rate and the poly-meter concentration, and the third correlation model comprises a functional relation between the residual water content and the interfacial tension change rate and the interfacial shear viscosity change rate.

Preferably, the first correlation model is:

in the formula:

Δ γ represents a rate of change in interfacial tension, and is a dimensionless number;

C_p、C_Srespectively representing the concentration of the polymer and the concentration of the surfactant, and the unit is mg/L;

A₁、A₂、A₃、A₄is a constant.

Preferably, the second correlation model is:

in the formula:

Δ η represents the interfacial shear viscosity change rate, and is a dimensionless number;

B₁、B₂、B₃、B₄is a constant.

Preferably, the third correlation model includes:

in the formula:

φ₂the residual water content is expressed as a dimensionless number;

C₁、C₂、C₃、C₄、C₅、C₆is a constant.

Preferably, the target residual water content model is:

in the formula:

φ₂the residual water content is expressed as a dimensionless number;

A₁、A₂、A₃、A₄、B₁、B₂、B₃、B₄、C₁、C₂、C₃、C₄、C₅、C₆are all constants.

Preferably, after the residual water content of the target produced fluid is determined based on the target polymer table concentration and the target residual water content model, a target stability model is obtained, wherein the target stability model comprises a corresponding relation between the produced fluid stability degree and the residual water content of the produced fluid, and the stability degree of the target produced fluid is determined based on the residual water content of the target produced fluid and the target stability model.

Preferably, the target stability model is:

when the residual water content is less than 10%, the stability of the produced liquid is unstable;

when the residual water content is between 10% and 40%, the stability of the produced liquid is metastable;

and when the residual water content is more than 40%, the stability of the produced liquid is stable.

Preferably, the device for determining the residual water content and the stability of the compound drive produced fluid comprises an interface rheometer, an interface tensiometer and a processing unit, wherein the interface rheometer and the interface tensiometer are respectively connected with the processing unit, the processing unit comprises a software system and a hardware system, the software system comprises a database, a configuration module and a calculation module, the database is connected with the configuration module, the configuration module is connected with the calculation module, the configuration module is used for transmitting parameters to the calculation module, the database is used for storing the calculation results of the calculation module, the configuration module can call out the calculation results from the database, the configuration module is used for acquiring the target polymer concentration and the target residual water content model of the target produced fluid, and the calculation module is used for calculating the residual water content and the target residual water content model based on the target polymer concentration and the target residual water content model, the method comprises the steps of determining the residual water content of the target produced fluid, wherein a database is used for storing and calculating various related parameters, the hardware system comprises an input device, a communication server, a processor and a memory, the input device, the communication server and the memory are respectively connected with the processor, a configuration module and a calculation module are installed in the processor, the database is installed in the memory, an interface rheometer and an interface tensiometer are respectively connected with the communication server, the interface rheometer and the interface tensiometer are respectively used for measuring interface viscosity and tension parameters, the measured interface viscosity and tension parameters are input into the configuration module through the communication server, and the input device comprises a human-computer interaction interface.

Compared with the prior art, the invention has the advantages that:

(1) the invention discloses a method for determining the residual water content of a composite flooding produced fluid, which can obtain a target residual water content model suitable for a target oil reservoir, wherein the model comprises a functional relation between the residual water content and the polymer surface concentration of the produced fluid produced from the target oil reservoir through composite flooding, the polymer concentration and the surfactant concentration in the target produced fluid of the target oil reservoir are obtained, and then the residual water content of the target produced fluid is determined based on the target residual water content model, the polymer concentration and the surfactant concentration in the target produced fluid; after a target polymer surface concentration and a target residual water content model which are residual in the target produced liquid are obtained, the residual water content of the target produced liquid can be obtained based on the target polymer surface concentration and the target residual water content model of the target produced liquid, the residual water content refers to the percentage of the water content of the target produced liquid after dehydration to the water content before dehydration, and the higher the residual water content is, the lower the dehydration rate is;

(2) the invention can predict the dehydration rate of the target produced liquid based on the polymer surface concentration of the target produced liquid and the target residual water content model, because the dehydration rate of the produced liquid is related to the interfacial property of the produced liquid, and the target residual water content model is established based on the interfacial property data and the residual water content data under various polymer surface concentrations, therefore, the relation between the residual water content and the polymer surface concentration can be accurately reflected, so that the residual water content of the target produced fluid can be accurately and effectively predicted based on the polymer surface concentration of the target produced fluid and the target residual water content model, the method is simple and convenient to operate, theoretical guidance can be provided for further treatment and gathering and transportation of the produced liquid, the technical problem that the dehydration rate of the target produced liquid is not predicted in the prior art is solved, and the technical problem that the dehydration rate of the target produced liquid is predicted simply and conveniently is achieved;

(3) the polymer and the surfactant selected by the preset surface concentration in the target residual water content model established by the invention are respectively the same as the polymer and the surfactant of the target surface concentration, and different positions, different polymers, different surfactants and PH are considered, so that the obtained water content has higher precision, multiple measurements are avoided, the energy consumption is reduced, and the service life of field equipment is prolonged;

(4) the invention discloses a device for determining the residual water content of a compound flooding produced liquid, which comprises an interface rheometer, an interface tensiometer and a processing unit, wherein the interface viscosity and tension parameters are measured by using the interface rheometer and the interface tensiometer, and the measured interface viscosity and tension parameters are input into a configuration module and a calculation module for calculation through a communication server.

Drawings

FIG. 1 is a flow chart of a method for determining residual water content of a composite flooding produced fluid according to the present invention;

FIG. 2 is a graph comparing a fitting value and an experimental value of a third correlation model of the residual water content with respect to changes in interfacial tension and interfacial shear viscosity in example 8 of the present invention;

FIG. 3 is a graph comparing the fitting value of the residual water content model with respect to the concentration of the polymer table in example 8 of the present invention with the experimental value;

FIG. 4 is a schematic structural diagram of a device for determining the residual water content and the stability of the composite flooding produced fluid.

Description of reference numerals:

1-interface rheometer, 2-interface tension meter, 3-input device, 4-communication server, 5-processor and 6-memory.

Detailed Description

The following describes embodiments of the present invention with reference to examples:

it should be noted that the structures, proportions, sizes, and other embodiments disclosed herein are illustrative only and are not intended to limit the scope of the invention, which is defined by the claims, since the scope of the invention is not limited by the specific structures, proportions, and dimensions, or otherwise, unless otherwise specified, since various modifications, changes in the proportions and variations thereof, can be made by those skilled in the art without departing from the spirit and scope of the invention.

The principles and spirit of the present invention will be described with reference to a number of exemplary embodiments. It is understood that these embodiments are given solely for the purpose of enabling those skilled in the art to better understand and to practice the invention, and are not intended to limit the scope of the invention 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 invention may be embodied as a system, apparatus, 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.

The present invention provides a method for determining the residual water content of a combined flooding produced fluid, and although the present invention provides the method operation steps or the device structure shown in the following examples or figures, more or less operation steps or module units can be included in the method or the device based on the conventional or non-creative labor. In the case of steps or structures which are logically not related in a necessary cause and effect, the execution sequence of the steps or the block structure of the apparatus is not limited to the execution sequence or the block structure described in the embodiment of the present invention and shown in the drawings. 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).

Example 1

As shown in figure 1, the invention discloses a method for determining the residual water content of a composite flooding produced fluid, which comprises the following steps:

Example 2

Preferably, after determining the residual water content of the target produced fluid based on the target polymer table concentration and the target residual water content model, the method further comprises obtaining a target stability model, wherein the target stability model comprises a corresponding relation between the produced fluid stability degree and the residual water content of the produced fluid, and determining the stability degree of the target produced fluid based on the residual water content of the target produced fluid and the target stability model.

Example 3

Example 4

Example 5

Preferably, the first correlation model is:

in the formula:

A₁、A₂、A₃、A₄is a constant.

Preferably, the second correlation model is:

in the formula:

B₁、B₂、B₃、B₄is a constant.

Preferably, the third correlation model includes:

in the formula:

φ₂the residual water content is expressed as a dimensionless number;

C₁、C₂、C₃、C₄、C₅、C₆is a constant.

Preferably, the target residual water content model is:

in the formula:

φ₂the residual water content is expressed as a dimensionless number;

Example 6

Preferably, the first correlation model is:

in the formula:

A₁、A₂、A₃、A₄is a constant.

Preferably, the second correlation model is:

in the formula:

C_p、C_Srespectively representing polymer concentration and surface activityThe concentration of the preparation is mg/L;

B₁、B₂、B₃、B₄is a constant.

Preferably, the third correlation model includes:

in the formula:

φ₂the residual water content is expressed as a dimensionless number;

C₁、C₂、C₃、C₄、C₅、C₆is a constant.

Preferably, the target residual water content model is:

in the formula:

φ₂the residual water content is expressed as a dimensionless number;

Preferably, the target stability model is:

Example 7

Preferably, the first correlation model is:

in the formula:

A₁、A₂、A₃、A₄is a constant.

Preferably, the second correlation model is:

in the formula:

C_p、C_Seach represents a polymerConcentration and surfactant concentration in mg/L;

B₁、B₂、B₃、B₄is a constant.

Preferably, the third correlation model includes:

in the formula:

φ₂the residual water content is expressed as a dimensionless number;

C₁、C₂、C₃、C₄、C₅、C₆is a constant.

Preferably, the target residual water content model is:

in the formula:

φ₂the residual water content is expressed as a dimensionless number;

Preferably, the target stability model is:

As shown in fig. 4, preferably, the device for determining the residual water content and the stability of the composite flooding produced fluid comprises an interfacial rheometer 1, an interfacial tensiometer 2 and a processing unit, wherein the interfacial rheometer 1 and the interfacial tensiometer 2 are respectively connected to the processing unit, the processing unit comprises a software system and a hardware system, the software system comprises a database, a configuration module and a calculation module, the database is connected to the configuration module, the configuration module is connected to the calculation module, the calculation module is connected to the database, the configuration module is used for performing parameter transmission to the calculation module, the database is used for storing the calculation results of the calculation module, the configuration module can call out the calculation results from the database, the configuration module is used for obtaining the target polymer concentration and the target residual water content model of the target produced fluid, the calculation module is used for determining the residual water content of the target produced liquid based on the target polymer table concentration and the target residual water content model, wherein the database is used for storing various parameters related to the calculation, the hardware system comprises an input device 3, a communication server 4, a processor 5 and a memory 6, wherein the input device 3, the communication server 4 and the memory 6 are respectively connected with the processor 5, wherein the configuration module and the calculation module are installed in the processor 5, wherein the database is arranged in the memory 6, the interface rheometer 1 and the interface tensiometer 2 are respectively connected with the communication server 4, the interface rheometer 1 and the interface tensiometer 2 are respectively used for measuring interface viscosity and tension parameters, the measured interface viscosity and tension parameters are input into the configuration module through the communication server 4, and the input equipment comprises a human-computer interaction interface.

The database is created through SQL server 2008, the configuration module is Forcecontrol 7.0, the calculation module is the existing software selected according to the calculation method and can be installed on a microcomputer, the input device is a keyboard and a mouse, the communication server is an industrial rack type 16-way serial server, and the processor and the memory are microcomputers, and all belong to the prior art.

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 target produced fluid is produced fluid produced by adopting a binary combination flooding or ternary combination flooding technology in a target oil reservoir. The target reservoir is the reservoir to be studied. The target polymer concentration of the target production fluid may include a concentration of a target polymer remaining in the target production fluid and a concentration of a target surfactant. Wherein, the target polymer and the target surfactant respectively refer to the polymer and the surfactant used in the binary combination flooding or ternary combination flooding technology adopted on site. For example, the concentration of the polymer in the target production fluid may be directly detected on site, and the detected concentration of the polymer may be stored in a database, from which the target concentration of the target production fluid may be obtained.

The target residual water content model can comprise a functional relation between the residual water content of the produced liquid and the polymer surface concentration. The target residual water content model can be suitable for determining the residual water content of the produced liquid produced from the target oil reservoir by the same composite flooding technology. Wherein, the residual water content is the percentage of the water content of the extracted liquid after dehydration to the water content before dehydration. The higher the residual water content of the produced liquid is, the lower the dehydration rate is, and the higher the stability is. The lower the residual water content of the produced liquid is, the higher the dehydration rate is and the lower the stability is. The target residual moisture content model may be pre-established based on experimental data. For example, the target residual water content model may be established based on the interface characteristic data and the residual water content data at a plurality of concentration levels. Because the residual water content or the dehydration rate of the target produced liquid is very related to the interface characteristic, the target residual water content model established based on the interface characteristic data can accurately reflect the relation between the concentration of the polymer table and the residual water content. Furthermore, given that reservoir properties may vary with production, the target residual water cut model may be updated periodically (e.g., every half year or year) to ensure accuracy of the model. The pre-established target residual moisture content model may be stored in the processor, and the target residual moisture content model may be obtained from the processor.

After the target surface concentration and target residual water content model of the target produced fluid is obtained, the residual water content of the target produced fluid can be determined based on the target surface concentration and target residual water content model. For example, the target polymer concentration may be input into the target residual water content model to obtain the residual water content of the target production fluid. In some embodiments of the invention, after the residual water content of the target produced fluid is obtained, the dehydration rate of the target produced fluid can be determined according to the residual water content of the target produced fluid. For example, the dehydration rate of the target production fluid may be 1 minus the residual water content of the target production fluid.

Specifically, the residual water content is the percentage of the water content of the produced fluid after dehydration to the water content before dehydration, and the higher the residual water content is, the more difficult the dehydration is, that is, the higher the stability of the produced fluid is. Therefore, after the residual water content of the target produced fluid is determined according to the target surface concentration and the target residual water content model, the target stability model can be obtained. The target stability model may include a corresponding relationship between a stability of the produced fluid and a residual water content of the produced fluid. The target stability model can be used for evaluating the stability degree of target produced liquid produced by a target oil reservoir. After determining the residual water content of the produced fluid and obtaining the target stability model, the stability of the target produced fluid may be determined based on the residual water content of the target produced fluid and the target stability model. By the above mode, after the residual water content of the target produced liquid is determined based on the target residual water content model and the target surface concentration of the target produced liquid, the stability degree of the target produced liquid can be evaluated based on the residual water content of the target produced liquid and the target stability model.

Further, the target stability model includes: when the residual water content is within 10%, the stability of the produced liquid is unstable; when the residual water content is between 10% and 40%, the stability of the produced liquid is metastable; when the residual quantity is more than 40%, the stability degree of the produced liquid is stable.

Specifically, the degree of stability can be divided into three types: stable, metastable, and unstable. The corresponding relationship between the residual water content and the stability of the produced liquid can be set based on actual conditions. For example, the stability of the produced fluid with a residual water content of less than 10% may be determined as unstable, i.e., the stability is low and the produced fluid is easily dehydrated. The stability of the produced liquid with the residual water content between 10% and 40% can be judged as metastable, namely, the stability is higher, and the produced liquid is difficult to dehydrate. The stability of the produced liquid with the residual water content of more than 40 percent can be judged as stable, namely, the stability is high, and the produced liquid is difficult to dehydrate. By the mode, the stability of the produced liquid can be determined qualitatively based on the residual water content of the produced liquid.

It will be appreciated that the target stability model in the above embodiments is merely exemplary. In other embodiments, three or more stability levels may be set, and three or more residual water content intervals corresponding to the three or more stability levels may be set relatively, so as to more accurately evaluate the stability level of the produced fluid.

The interface property data may include data characterizing oil and water interface properties. The plurality of predetermined polyepitometer concentrations may include a combination of a plurality of polymer concentrations and a plurality of surfactant concentrations. The number of species of polyepitometer concentration is the product of the number of polymer concentrations and the number of surfactant concentrations. For example, 5 polymer concentrations and 5 surfactant concentrations can be set, and combined to give 25 polyepitometer concentrations.

Under the condition that the composite flooding is binary composite flooding, various simulated produced water can be prepared according to various polymer surface concentrations. And then, preparing the prepared various simulated produced water and the on-site binary composite flooding produced crude oil into various simulated oil-water interface systems. And obtaining interface characteristic data and residual water content data corresponding to various preset concentration of polymer by measuring the interface characteristic data and the residual water content data of various simulated oil-water interface systems.

Under the condition that the combination flooding is the ternary combination flooding, various simulated produced water can be prepared according to various polymer surface concentrations. And then, preparing the prepared various simulated produced water and the on-site binary composite flooding produced crude oil into various simulated oil-water interface systems. And finally, adding alkali (such as sodium hydroxide or sodium carbonate) into the prepared multiple simulated oil-water interface systems according to the pH value of the on-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 on-site ASP flooding produced liquid, thereby obtaining the simulated oil-water interface system with the adjusted pH value. And obtaining interface characteristic data and residual water content data corresponding to various preset concentration of the polymer by measuring the interface characteristic data and the residual water content data of the simulated oil-water interface system after the PH values are adjusted.

The interface property data may include interface tension data and interface shear viscosity data; correspondingly, establishing a target residual water content model based on the multiple preset concentration of the aggregation table and the interface characteristic data and residual water content data corresponding to the multiple preset concentration of the aggregation table, which may include: establishing a first correlation model according to interface tension data corresponding to various preset concentration table concentrations; establishing a second correlation model according to interface shear viscosity data corresponding to various preset polymer table concentrations; establishing a third correlation model according to interfacial tension data, interfacial shear viscosity data and residual water content data corresponding to various preset polymer table concentrations; the first correlation model comprises a functional relation between the change rate of interfacial tension and the concentration of the poly-meter, the second correlation model comprises a functional relation between the change rate of interfacial shear viscosity and the concentration of the poly-meter, and the third correlation model comprises a functional relation between the residual water content and the change rate of interfacial tension and the change rate of interfacial shear viscosity; and determining a target residual water content model based on the first correlation model, the second correlation model and the third correlation model.

The interface property data may include, among other things, interface tension data and interface shear viscosity data. The interfacial tension data may include interfacial tensions of a plurality of simulated oil-water interface systems, and the interfacial shear viscosity data may include interfacial shear viscosities of a plurality of simulated oil-water interface systems. 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. Interfacial tension reflects the magnitude of the interfacial gibbs free energy per unit area. Interfacial shear viscosity refers to the ability of different liquid interfaces to deform or even break down against tangential forces. The interfacial shear viscosity is the stress at which the oil-water interface resists interfacial deformation when subjected to shear. Wherein, the residual water content data can comprise the water content of various simulated oil-water interface systems before dehydration, the water content after dehydration and the percentage of the water content after dehydration to the water content before dehydration.

The first correlation model may be established based on the plurality of preset tabulation concentrations and interfacial tension data corresponding to the plurality of preset tabulation concentrations. Wherein, the first correlation model can include the function relationship between the interfacial tension change rate and the concentration of the poly-meter. Wherein the rate of change of interfacial tension may be a rate of change of interfacial tension of a simulated oil-water interface system compared to an oil-water interface system that does not include a polymer and a surfactant. For example, the interfacial tension change rate data corresponding to the various preset concentration levels may be determined based on the interfacial tension data corresponding to the various preset concentration levels. And then, fitting can be carried out based on the multiple poly-table concentrations and the interfacial tension change rate data corresponding to the multiple poly-table concentrations to obtain a functional relation between the interfacial tension change rate and the poly-table concentrations, namely a first correlation model.

The second correlation model may be established based on the plurality of preset epi-concentration and interface shear viscosity data corresponding to the plurality of preset epi-concentration. Wherein the second correlation model may include a functional relationship between the rate of change of the interfacial shear viscosity data and the concentration of the polymer. Wherein the rate of change of the interfacial shear viscosity data can be a rate of change of the interfacial shear viscosity data of the simulated oil-water interface system compared to the interfacial shear viscosity data of an oil-water interface system that does not include the polymer and the surfactant. For example, the interface shear viscosity change rate data corresponding to the various preset concentration concentrations may be determined based on the interface shear viscosity data corresponding to the various preset concentration concentrations. And then, fitting can be performed based on the multiple poly-meter concentrations and the interface shear viscosity change rate data corresponding to the multiple poly-meter concentrations to obtain a functional relation between the interface shear viscosity change rate and the poly-meter concentrations, namely a second correlation model.

And establishing a third correlation model based on the interfacial tension data, the interfacial shear viscosity data and the residual water content data corresponding to various preset polymer table concentrations. The third correlation model may include a functional relationship between the residual water content and a change rate of the interfacial tension and a change rate of the interfacial shear viscosity. For example, a third correlation model, which is a functional relationship between the residual water content and the interfacial tension change rate and the interfacial shear viscosity change rate, may be obtained based on the interfacial tension change rate data, the interfacial shear viscosity change rate data, and the residual water content data corresponding to the plurality of predetermined polymer concentrations.

After the first, second, and third correlation models are established, the target residual moisture content model may be determined based on the first, second, and third correlation models. That is, the functional relationship between the residual water content and the poly-surface concentration is determined based on the functional relationship between the interfacial tension change rate and the poly-surface concentration, the functional relationship between the interfacial shear viscosity change rate and the poly-surface concentration, and the functional relationship between the residual water content and the interfacial tension change rate and the interfacial shear viscosity change rate. In the above manner, based on the interface characteristic data and the residual water content data measured under a plurality of types of concentration table, the functional relationship between the residual water content and the concentration table is established, and the target residual water content model is obtained.

Further, the first correlation model may include:

wherein, Δ γ represents the interfacial tension change rate, and is a dimensionless number; c_P、C_SRespectively representing the concentration of the polymer and the concentration of the surfactant, and the unit is mg/L; a. the₁、A₂、A₃、A₄Is a constant. The interfacial tension change rate may be calculated by Δ γ ═ γ (C)_P，C_S) - γ (0, 0) |/γ (0, 0). Wherein, gamma (C)_P，C_S) Is a polymer concentration of C_PAnd the surfactant concentration is C_SAnd correspondingly simulating the interfacial tension of an oil-water interface system. γ (0, 0) is the interfacial tension of the corresponding oil-water interface system at a polymer concentration of 0 and a surfactant concentration of 0. Wherein A is₁、A₂、A₃、A₄Can be obtained by fitting.

Further, the second correlation model may include:

wherein Δ η represents the interface shear viscosity change rate as a dimensionless number, C_P、C_SRespectively representing the concentration of the polymer and the concentration of the surfactant, and the unit is mg/L; b is₁、B₂、B₃、B₄Is constant, wherein the interfacial shear viscosity change rate can be calculated by a method of Δ η ═ η (C)_P，C_S) - η (0, 0) |/η (0, 0) |, where, η (C)_P，C_S) Is a polymer concentration of C_PAnd the surfactant concentration is C_Sη (0, 0) is the interfacial shear viscosity of the corresponding oil-water interface system when the polymer concentration is 0 and the surfactant concentration is 0, wherein B₁、B₂、B₃、B₄Can be obtained by fitting.

Further, the third correlation model may include:

wherein phi is₂The residual water content is expressed as a dimensionless number; c_P、C_SRespectively representing the concentration of the polymer and the concentration of the surfactant, and the unit is mg/L; c₁、C₂、C₃、C₄、C₅、C₆Is a constant. A. the₁、A₂、A₃、A₄Is A in the first correlation model₁、A₂、A₃、A₄A constant. B is₁、B₂、B₃、B₄Is B in the second correlation model₁、B₂、B₃、B₄A constant. Wherein phi is₂＝φ₂(C_P，C_S) Is a polymer concentration of C_PAnd the surfactant concentration is C_SAnd simulating the residual water content of the corresponding oil-water interface system. Wherein, the calculation method of the residual water content may be phi₂(C_P，C_S)＝φ₁(C_P，C_S)/φ₀(C_P，C_S). Wherein phi is₁(C_P，C_S) Is a polymer concentration of C_PAnd the surfactant concentration is C_SWater content of the corresponding simulated oil-water interface system after dehydration, phi₀(C_P，C_S) Is a polymer concentration of C_PAnd the surfactant concentration is C_SAnd the water content of the corresponding simulated oil-water interface system before dehydration. Wherein, C₁、C₂、C₃、C₄、C₅、C₆Can be obtained by fitting.

The above method is described with reference to a specific embodiment, however, it should be noted that the specific embodiment is only for better illustration of the present invention and should not be construed as a limitation of the present invention.

Example 8

The method in this embodiment is explained by taking binary compound flooding as an example. Under the condition that the composite flooding is the ternary composite flooding, only alkali needs to be added into a prepared oil-water interface system to adjust the pH value of the oil-water interface system to be consistent with the pH value of produced liquid of the on-site ternary composite flooding. In this embodiment, the method for determining the residual water content of the binary combination flooding produced fluid may include the following steps.

Step 1, taking 25 parts of deionized water and 25 parts of oil, wherein the oil viscosity is about 20 mPas, optionally, the specification of the deionized water is ultrapure water with the resistivity of 18 MOmega/cm, and the oil is solvent oil with the viscosity of about 20 mPas.

Step 2, dividing 25 parts of deionized water into 5 groups, wherein each group corresponds to a polymer concentration, and each of 5 samples in each group corresponds to a surfactant concentration, namely adding the polymers and the surfactants with different concentrations into 25 parts of deionized water; alternatively, the concentration gradient of the polymer is 0mg/L, 1mg/L, 10mg/L, 100mg/L, 1000mg/L, and the concentration gradient of the surfactant is 0mg/L, 0.1mg/L, 1mg/L, 10mg/L, 100 mg/L; alternatively, the polymer used in this example is polyacrylamide and the surfactant is a betaine surfactant.

And 3, respectively preparing 25 parts of deionized water and 25 parts of oil into which the polymer and the surfactant are added in the step 2 to obtain 25 parts of an oil-water interface system.

Step 4, taking the oil-water interface system containing the polymers with different concentrations and the surfactant prepared in the step 3; measuring the interfacial tension of each oil-water interface system and marking as gamma (i, j), wherein i is the polymer concentration number (i is more than or equal to 0 and less than or equal to 4), and j is the surfactant concentration number (j is more than or equal to 0 and less than or equal to 7); alternatively, the measurement temperature of the interfacial tension is 40 ℃.

Step 5, taking the oil-water interface system containing the polymers with different concentrations and the surfactant prepared in the step 3; optionally, an interfacial shear viscosity of the oil-water interface system can be measured by using an interfacial rheometer and is recorded as η (i, j); alternatively, the temperature range for measuring the interfacial shear viscosity may be 40 ℃.

And 6, calculating a change rule of the change rate of the interfacial tension along with the polymer concentration and the surfactant concentration according to the measurement result gamma (i, j) of the interfacial tension under different polymer table concentrations, so as to judge the correlation between the polymer concentration and the surfactant concentration on the interfacial tension, and further obtain the correlation between the polymer concentration and the surfactant concentration on the dehydration rate of the oil-water interface, wherein optionally, the calculation method of the change rate of the interfacial tension (i.e. the reduction rate of the interfacial tension) is delta gamma (i, j) ═ gamma (i, j) -gamma (0, 0) |/gamma (0, 0), and the calculation result is shown in table 1, wherein the unit of the change rate is%.

TABLE 1

Step 7, calculating the change rule of the interface shear viscosity change rate along with the polymer concentration and the surfactant concentration according to the interface shear viscosity measurement result eta (i, j) under different polymer surface concentrations, so as to judge the correlation between the polymer concentration and the surfactant concentration to the interface shear viscosity, and further obtain the correlation between the polymer concentration and the surfactant concentration to the oil-water interface dehydration rate; alternatively, the interfacial shear viscosity change rate (i.e., the interfacial shear viscosity increase rate) may be calculated by Δ η (i, j) ═ η (i, j) - η (0, 0) |/η (0, 0), and the calculation results are shown in table 2, in which the change rate unit is%.

TABLE 2

Step 8, mixing the deionized water containing different polymer surface concentrations prepared in the step 2 and the oil with the same parts, placing the mixture in a water bath, and keeping the temperature for 15 minutes; optionally, the volume ratio of the mixture of the water phase and the oil phase is 4:1, and the water bath temperature is 50 ℃. Stirring the oil-water mixed solution for 20 minutes by using a stirring paddle, wherein the rotating speed of the stirring paddle is 1000 revolutions per minute. The oil-water mixed solution after stirring is placed in another constant temperature water bath, the temperature of the water bath is the dehydration temperature, and the temperature is 40 ℃. When the oil-water mixture is just placed in a dewatering water bath, taking an upper oil sample to measure the initial oil phase water content, and recording the initial oil phase water content of each sample as phi₀(i, j). When the dehydration was carried out for 30 minutes, the upper layer oil sample was taken, the water content of the oil phase was measured, and the water content of each sample after the dehydration was recorded as φ₁(i, j). According to the initial water content phi₀(i, j) and the water content after dehydration [ phi ]₁(i, j), calculating the residual water content rate phi₂(i, j) by the calculation method of phi₂(i，j)＝φ₁(i，j)/φ₀(i, j) the residual water content of each sample is shown in Table 3, in which the unit of residual water content is%.

TABLE 3

Step 9, setting the concentration of the polymer as C_PWith a surfactant concentration of C_SFor the interfacial tension reduction ratio Deltagamma and the polymer concentration C_PAnd surfactant concentration C_SThe following expression is obtained by fitting the relationship therebetween, wherein the degree of fitting R square is 0.9909.

In the formula, the unit of [ Delta ] gamma is% C_P、C_SThe unit of (b) is mg/L.

Step 10, the interface shear viscosity growth rate delta η and the polymer concentration C_PAnd surfactant concentration C_SThe following expression is obtained by fitting the relationship therebetween, wherein the degree of fitting R square is 0.9857.

Wherein the unit of Δ η is%, C_P、C_SThe unit of (b) is mg/L.

Step 11, regarding the residual water content phi₂Fitting with the relationship between the interfacial tension reduction rate Deltay and the interfacial shear viscosity increase rate Delta η to obtain the following expression, wherein the fitting degree R is 0.9653.

In the formula, phi₂The unit of Δ γ, Δ η is%. fig. 3 shows a comparison of the fitting value of the residual water content with respect to the change rate of the interfacial tension and the change rate of the interfacial shear viscosity in this embodiment with the experimental value, as can be seen from fig. 3, the experimental value and the fitting value are in agreement, which shows that the fitted expression can well show the correlation between the residual water content and the reduction rate of the interfacial tension and the increase rate of the interfacial shear viscosity.

Step 12, combining the formulas (1), (2) and (3) to obtain the residual water content phi₂With polymer concentration C_PAnd surfactant concentration C_SThe expression of (1), namely the target residual water content model described in the above embodiment.

And step 13, the average value of the relative errors of the model predicted value and the experimental test value predicted according to the target residual water content model is 3.46%. As shown in FIG. 4, FIG. 4 is a graph showing the comparison of the fitting value of the residual water content model with respect to the concentration of the aggregation table in the present embodiment with the experimental value. As can be seen from fig. 4, the experimental values are in agreement with the fitted values, indicating that the fitted expression can well indicate the correlation between the residual water content and the polymer concentration and the surfactant concentration.

Step 14, a target stability model may be set, i.e., consider φ₂The emulsion is unstable within 10 percent, is metastable between 10 percent and 40 percent, is stable above 40 percent, and can obtain the stability division of the oil-water emulsion under different reduction amplitudes of interfacial tension and increase amplitudes of interfacial shear viscosity.

Step 15, after the target residual water content model and the target stability model are established, the target polymer concentration and the target surfactant concentration in the target produced fluid produced by the target oil reservoirs adopting the binary combination flooding technology, which are suitable for the two models, can be obtained, then the residual water content of the target produced fluid can be determined according to the target polymer concentration and the target residual water content model, and after the residual water content of the target produced fluid is determined, the stability degree of the target produced fluid can be determined according to the residual water content of the target produced fluid and the target stability model.

According to the method in the embodiment, the oil-water interfacial tension between the polymer-containing water and the oil phase is reduced along with the increase of the concentration of the surfactant and the concentration of the polymer, the change along with the concentration of the surfactant is obvious, and the influence along with the change of the concentration of the polymer is weak; the shear viscosity of the oil-water interface rises along with the rise of the concentration of the surfactant and the polymer, is weaker along with the change of the concentration of the surfactant, and has more obvious influence along with the change of the concentration of the polymer; the residual water content of the oil-water interface system rises along with the rise of the concentration of the surfactant and the concentration of the polymer, the residual water content changes obviously along with the change of the concentration of the surfactant and has weaker influence along with the change of the concentration of the polymer; the dehydration rate of the oil-water interface system is reduced along with the increase of the concentration of the surfactant and the concentration of the polymer; the stability of the oil-water interface system increases with the increase in the surfactant concentration and the polymer concentration. Based on the method in the embodiment, the method shows that negative correlation exists between the oil-water interfacial tension and the poly-surface concentration, positive correlation exists between the oil-water interfacial shear viscosity and the poly-surface concentration, and negative correlation exists between the dehydration efficiency and the poly-surface concentration. Thus, it can be seen that there is a positive correlation between the dewatering efficiency and the interfacial tension and a negative correlation between the dewatering efficiency and the interfacial shear viscosity. And then, fitting can be carried out based on experimental data, the change rule of the change rate of the interfacial tension along with the concentration of the polymer surface, the change rule of the interfacial shear viscosity along with the concentration of the polymer surface and the change rule of the residual water content along with the concentration of the polymer surface can be quantitatively described, and finally the change rule of the dehydration rate of the produced liquid along with the concentration of the polymer surface can be obtained. In the above embodiment, after the target residual water content model and the target stability model are established, the residual water content of the target produced fluid can be accurately predicted based on the target residual water content model and the target polymer surface concentration of the target produced fluid, so as to accurately predict the dehydration rate of the target produced fluid, and then the stability degree of the target produced fluid is determined based on the residual water content of the target produced fluid and the target stability model. The method in the embodiment can effectively predict the dehydration rate and the stability of the produced liquid, is simple and convenient to operate, and can provide theoretical guidance for further treatment and gathering of the produced liquid.

Example 9

The method comprises the steps of measuring a target produced liquid to obtain a polymer concentration of 200mg/L and a surfactant concentration of 15mg/L, wherein the reduction rate delta gamma of the interfacial tension is 97.18% and the increase rate delta eta of the interfacial shear viscosity is 24.87%, and calculating to obtain a residual water content of 48.83% according to a target residual water content model obtained in an embodiment 8 (the polymer and the surfactant of the produced liquid in an embodiment 9 are the same as those of the produced liquid in an embodiment 8), namely the produced liquid is stable.

The invention realizes the following technical effects: after the target polymer surface concentration and the target residual water content model which are remained in the target produced liquid are obtained, the residual water content of the target produced liquid can be obtained based on the target polymer surface concentration and the target residual water content model of the target produced liquid, the residual water content refers to the percentage of the water content of the target produced liquid after dehydration to the water content before dehydration, and the higher the residual water content is, the lower the dehydration rate is. The method can predict the dehydration rate of the target produced fluid based on the polymer surface concentration of the target produced fluid and the target residual water content model, and can accurately reflect the relation between the residual water content and the polymer surface concentration because the dehydration rate of the produced fluid is related to the interface property of the produced fluid and the target residual water content model is established based on the interface characteristic data and the residual water content data under various polymer surface concentrations.

The input device may particularly be one of the main means 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, a 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 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. 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 invention also provides a computer storage medium based on the method for determining the residual water content of the compound flooding produced fluid, wherein the computer storage medium stores computer program instructions, and the computer program instructions realize the steps of the method for determining the residual water content of the compound flooding produced fluid in any embodiment when being executed.

In the present 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 (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 invention 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 than 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 invention are not limited to any specific combination of hardware and software.

The invention discloses a method for determining the residual water content of a composite flooding produced fluid, which can obtain a target residual water content model suitable for a target oil reservoir, wherein the model comprises a functional relation between the residual water content and the polymer surface concentration of the produced fluid produced from the target oil reservoir through composite flooding, the polymer concentration and the surfactant concentration in the target produced fluid of the target oil reservoir are obtained, and then the residual water content of the target produced fluid is determined based on the target residual water content model, the polymer concentration and the surfactant concentration in the target produced fluid; after the target polymer surface concentration and the target residual water content model which are remained in the target produced liquid are obtained, the residual water content of the target produced liquid can be obtained based on the target polymer surface concentration and the target residual water content model of the target produced liquid, the residual water content refers to the percentage of the water content of the target produced liquid after dehydration to the water content before dehydration, and the higher the residual water content is, the lower the dehydration rate is.

The invention can predict the dehydration rate of the target produced liquid based on the polymer surface concentration of the target produced liquid and the target residual water content model, because the dehydration rate of the produced liquid is related to the interfacial property of the produced liquid, and the target residual water content model is established based on the interfacial property data and the residual water content data under various polymer surface concentrations, therefore, the relation between the residual water content and the polymer surface concentration can be accurately reflected, so that the residual water content of the target produced fluid can be accurately and effectively predicted based on the polymer surface concentration of the target produced fluid and the target residual water content model, the method is simple and convenient to operate, theoretical guidance can be provided for further treatment and gathering and transportation of the produced liquid, the technical problem that the dehydration rate of the target produced liquid is not predicted in the prior art is solved, and the technical problem that the dehydration rate of the target produced liquid is predicted simply and conveniently is achieved.

The polymer and the surfactant selected by the preset surface concentration in the target residual water content model established by the invention are respectively the same as the polymer and the surfactant of the target surface concentration, and different positions, different polymers, different surfactants and PH are considered, so that the obtained water content has higher precision, multiple measurements are avoided, the energy consumption is reduced, and the service life of field equipment is prolonged.

The invention discloses a device for determining the residual water content of a compound flooding produced liquid, which comprises an interface rheometer, an interface tensiometer and a processing unit, wherein the interface viscosity and tension parameters are measured by using the interface rheometer and the interface tensiometer, and the measured interface viscosity and tension parameters are input into a configuration module and a calculation module for calculation through a communication server.

While the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

Many other changes and modifications can be made without departing from the spirit and scope of the invention. It is to be understood that the invention is not to be limited to the specific embodiments, but only by the scope of the appended claims. The components and structures of the present embodiments that are not described in detail are well known in the art and do not constitute essential structural elements or elements.

Claims

1. The method for determining the residual water content of the compound flooding produced liquid is characterized by comprising the following steps of:

2. The method for determining the residual water content of the composite flooding produced fluid according to claim 1, wherein the method for establishing the target residual water content model comprises the following steps: the method comprises the steps of obtaining interface characteristic data and residual water content data of various simulated oil-water interfaces formed by various simulated produced water and composite flooding produced crude oil corresponding to various preset polymer table concentrations, obtaining interface characteristic data and residual water content data corresponding to the various preset polymer table concentrations, and establishing a target residual water content model based on the various preset polymer table concentrations and the interface characteristic data and residual water content data corresponding to the various preset polymer table concentrations, wherein a polymer and a surfactant selected according to the preset polymer table concentrations are respectively the same as those of a polymer and a surfactant selected according to the target polymer table concentrations, the polymer is selected from polyacrylamide, and the surfactant is selected from betaine surfactants.

3. The method for determining the residual water content of the composite flooding produced fluid according to claim 2, wherein the interface characteristic data comprises interface tension data and interface shear viscosity data, and a target residual water content model is established based on the multiple preset polymer table concentrations and the interface characteristic data and the residual water content data corresponding to the multiple preset polymer table concentrations, and specifically comprises the following steps:

4. The method for determining the residual water content of the composite flooding produced fluid according to claim 3, wherein the first correlation model is:

in the formula:

A₁，A₂，A₃，A₄is a constant.

5. The method for determining the residual water content of the combined flooding produced fluid according to claim 4, wherein the second correlation model is as follows:

in the formula:

B₁，B₂，B₃，B₄is a constant.

6. The method of determining the residual water content of the combined flooding produced fluid according to claim 5, wherein the third correlation model comprises:

in the formula:

φ₂the residual water content is expressed as a dimensionless number;

C₁，C₂，C₃，C₄、C₅，C₆is a constant.

7. The method for determining the residual water content of the composite flooding produced fluid according to claim 6, wherein the target residual water content model is as follows:

in the formula:

φ₂the residual water content is expressed as a dimensionless number;

8. The method for determining the stability of the compound flooding produced liquid is characterized by comprising the following steps: the method comprises the steps of obtaining a target stability model after determining the residual water content of the target produced fluid based on the target polymer surface concentration and the target residual water content model of any one of claims 1-7, wherein the target stability model comprises a corresponding relation between the produced fluid stability degree and the residual water content of the produced fluid, and determining the stability degree of the target produced fluid based on the residual water content of the target produced fluid and the target stability model.

9. The method of determining the stability of a combination flooding production fluid of claim 8, wherein the target stability model is:

10. The device for determining the residual water content and the stability degree of the composite flooding produced fluid according to any one of claims 1 to 9, characterized in that: the device comprises an interface rheometer, an interface tensiometer and a processing unit, wherein the interface rheometer and the interface tensiometer are respectively connected with the processing unit, the processing unit comprises a software system and a hardware system, the software system comprises a database, a configuration module and a calculation module, the database is connected with the configuration module, the configuration module is connected with the calculation module, the calculation module is connected with the database, the configuration module is used for transmitting parameters to the calculation module, the database is used for storing calculation results of the calculation module, the configuration module can call out the calculation results from the database, the configuration module is used for acquiring target polymer table concentration and a target residual water content model of target produced liquid, the calculation module is used for determining the residual water content of the target produced liquid based on the target polymer table concentration and the target residual water content model, the system comprises a hardware system, a configuration module, a calculation module, a database, an interface rheometer and an interface tensiometer, wherein the hardware system comprises an input device, a communication server, a processor and a memory, the input device, the communication server and the memory are respectively connected with the processor, the configuration module and the calculation module are installed in the processor, the database is installed in the memory, the interface rheometer and the interface tensiometer are respectively connected with the communication server, the interface rheometer and the interface tensiometer are respectively used for measuring interface viscosity and tension parameters, the measured interface viscosity and tension parameters are input into the configuration module through the communication server, and the input device comprises a human-computer interaction interface.