CN110598340B - Method and device for determining gas injection oil displacement experiment fluid - Google Patents
Method and device for determining gas injection oil displacement experiment fluid Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
- E21B43/168—Injecting a gaseous medium
Abstract
The invention provides a method and a device for determining a gas injection oil displacement experiment fluid, wherein the method comprises the following steps: establishing a PVT model according to actual oil reservoir fluid physical property parameters; formation pressure P according to actual reservoir conditionsOil reservoirAnd minimum miscible pressure P of the injected gas and the formation crude oilMMP-oil poolAnd calculating the oil-gas miscible degree index lambda of the actual oil reservoir conditionOil reservoirCalculating the gas injection gravity standard number η of the actual oil reservoir condition according to the density difference and viscosity difference of the formation crude oil and the injected gas of the actual oil reservoir conditionOil reservoir(ii) a According to the components and compositions of the stratum crude oil and the injected gas of the actual oil reservoir conditions and a PVT model, taking lambda asOil reservoirAnd ηOil reservoirOil-gas miscible degree index lambda with experimental conditionsExperiment ofAnd gas injection gravity norm ηExperiment ofThe components and compositions of simulated oil and injected gas in the experiment are adjusted to be the same as the target; and preparing the experimental fluid according to the components and compositions of the adjusted simulated oil and the injected gas. The invention can improve the reliability and accuracy of the experiment.
Description
Technical Field
The invention relates to the field of oil and gas field development, in particular to a method and a device for determining a gas injection oil displacement experiment fluid.
Background
Gas flooding, an important enhanced oil recovery technology, has been widely used worldwideIn general, therefore, it is necessary to achieve simulated gas flooding in a laboratory environment. Gas injection pressure is an important factor influencing the gas injection oil displacement effect, however, because the condition of actual gas injection is harsh, the laboratory is difficult to reach, and the main manifestation is: 1. the oil field and mine field generally begin gas injection under the condition of formation pressure, while the formation pressure of some oil fields can reach 60MPa, and the harsh high-pressure condition causes great difficulty and challenge to the indoor experimental physical simulation; 2. different from water injection oil displacement, mutual solubility and mass transfer between oil and gas exist in the process of gas injection oil displacement, miscible phase can be achieved under certain pressure, and therefore the recovery rate of crude oil is improved, miscible phase pressure is closely related to the composition of crude oil, but crude oil in an oil reservoir is often rich in H2Toxic gases such as S and CH4And flammable and explosive gases bring great threat to the safety of laboratory experimenters.
In the existing experimental method, a steel model is commonly used for simulating a stratum, but the temperature resistance and pressure resistance of the steel model are difficult to meet the conditions of certain actual oil reservoir conditions, and the experimental result of the steel model cannot guide the development and production of the high-temperature and high-pressure stratum. In addition, in the current gas injection oil displacement experiment operation, the commonly used simulated oil does not contain H2S and CH4And the actual stratum crude oil components are changed in such a way, so that the process and effect of gas displacement oil are changed, and the reliability of the indoor experimental simulation result is low. Therefore, how to reasonably change the compositions of the simulation oil and the injected gas in the gas injection oil displacement experiment, reduce the experimental working pressure to a controllable range, and ensure the reliability and the accuracy of the experimental simulation result at the same time becomes a problem which needs to be researched urgently.
Disclosure of Invention
The invention provides a method and a device for determining a gas injection oil displacement experiment fluid, which aim to overcome the defects of insufficient pressure resistance of the existing gas injection oil displacement experiment equipment and inaccurate test result of the gas injection oil displacement experiment caused by the fact that actual simulation oil does not contain dangerous gas.
The first aspect of the invention provides a method for determining a gas injection flooding experiment fluid, which comprises the following steps:
establishing a PVT model according to actual oil reservoir fluid physical property parameters;
according to the actual oil reservoir conditionsPressure P of the formationOil reservoirAnd minimum miscible pressure P of the injected gas and the formation crude oilMMP-oil poolAnd calculating the oil-gas miscible degree index lambda of the actual oil reservoir conditionOil reservoir；
According to the density difference and viscosity difference of the formation crude oil and the injected gas under the actual oil reservoir condition, the gas injection gravity standard η under the actual oil reservoir condition is calculatedOil reservoir；
According to the components and the compositions of the stratum crude oil and the injected gas under the actual oil reservoir condition and a PVT model, the oil-gas miscible degree index lambda under the actual oil reservoir condition is usedOil reservoirAnd gas injection gravity norm ηOil reservoirOil-gas miscible degree index lambda of experimental conditions respectivelyExperiment ofAnd gas injection gravity norm ηExperiment ofThe components and compositions of simulated oil and injected gas in the experiment are adjusted to be the same as the target;
and preparing the experimental fluid according to the components and the compositions of the adjusted simulated oil and the injected gas.
The second aspect of the present invention provides a device for determining a gas injection flooding experiment fluid, including:
the modeling module is used for establishing a PVT model according to the physical property parameters of the actual oil reservoir fluid;
a first calculation module for calculating the formation pressure P according to the actual reservoir conditionsOil reservoirAnd minimum miscible pressure P of the injected gas and the formation crude oilMMP-oil poolAnd calculating the oil-gas miscible degree index lambda of the actual oil reservoir conditionOil reservoir；
The second calculation module is used for calculating the gas injection gravity standard η under the actual oil deposit condition according to the density difference and the viscosity difference of the formation crude oil and the injected gas under the actual oil deposit conditionOil reservoir；
An adjusting module for adjusting the oil-gas miscible degree index lambda of the actual oil reservoir condition according to the components and the compositions of the stratum crude oil and the injected gas of the actual oil reservoir condition and the PVT modelOil reservoirAnd gas injection gravity norm ηOil reservoirOil-gas miscible degree index lambda of experimental conditions respectivelyExperiment ofAnd gas injection gravity norm ηExperiment ofThe components and compositions of simulated oil and injected gas in the experiment are adjusted to be the same as the target;
and the configuration module is used for configuring the experimental fluid according to the components and the compositions of the adjusted simulation oil and the injected gas.
A third aspect of the present invention provides a computer apparatus, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor, when executing the computer program, implements the steps of the method for determining a gas injection flooding experimental fluid.
A fourth aspect of the present invention provides a computer readable storage medium storing a computer program for execution, which when executed by a processor, performs the steps of the method for determining a gas injection flooding experimental fluid.
The method comprises the steps of establishing a PVT model according to physical property parameters of actual oil reservoir fluid; formation pressure P according to actual reservoir conditionsOil reservoirAnd minimum miscible pressure P of the injected gas and the formation crude oilMMP-oil poolAnd calculating the oil-gas miscible degree index lambda of the actual oil reservoir conditionOil reservoirCalculating the gas injection gravity standard number η of the actual oil reservoir condition according to the density difference and viscosity difference of the formation crude oil and the injected gas of the actual oil reservoir conditionOil reservoir(ii) a According to the components and the compositions of the stratum crude oil and the injected gas under the actual oil reservoir condition and a PVT model, the oil-gas miscible degree index lambda under the actual oil reservoir condition is usedOil reservoirAnd gas injection gravity norm ηOil reservoirOil-gas miscible degree index lambda of experimental conditions respectivelyExperiment ofAnd gas injection gravity norm ηExperiment ofThe components and compositions of simulated oil and injected gas in the experiment are adjusted to be the same as the target; the experimental fluid is configured according to the components and the compositions of the adjusted simulated oil and the injected gas, so that the compositions of the experimental fluid (namely the simulated oil and the injected gas) can be changed, the experimental working pressure is reduced, and the reliability and the accuracy of the gas injection and oil displacement experiment are improved.
In order to make the aforementioned and other objects, features and advantages of the invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 illustrates a flow chart of a method of determination of a gas injection flooding experimental fluid of an embodiment of the present invention;
FIG. 2 shows a flow chart of simulated oil and injected gas composition and composition processes in a tuning test according to an embodiment of the present invention;
FIG. 3 shows a flow chart of a process of calculating experimental operating pressure in accordance with an embodiment of the present invention;
FIG. 4 shows a flow chart of a gas injection gravity calibration process for calculating experimental conditions according to an embodiment of the present invention;
fig. 5 is a view showing the configuration of a gas injection flooding experiment fluid determination apparatus according to an embodiment of the present invention;
fig. 6 shows a configuration diagram of an adjustment module of the embodiment of the present invention.
Detailed Description
In order to make the technical features and effects of the invention more obvious, the technical solution of the invention is further described below with reference to the accompanying drawings, the invention can also be described or implemented by other different specific examples, and any equivalent changes made by those skilled in the art within the scope of the claims are within the scope of the invention.
In the description herein, references to the description of "an embodiment," "a specific embodiment," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. The sequence of steps involved in the various embodiments is provided to schematically illustrate the practice of the invention, and the sequence of steps is not limited and can be suitably adjusted as desired.
In consideration of the defects that the pressure resistance of experimental equipment is insufficient and the test result of the gas injection oil displacement experiment is inaccurate due to the fact that actual simulation oil does not contain dangerous gas in the existing gas injection oil displacement experiment, the embodiment of the invention provides the determination method of the gas injection oil displacement experiment fluid. Specifically, as shown in fig. 1, the method for determining the gas injection flooding experiment fluid includes:
and step 110, establishing a PVT model according to the physical property parameters of the actual reservoir fluid.
In detail, the actual reservoir fluid physical parameters at least include: the formation pressure, the composition and composition of the formation crude oil and the injected gas, the density and viscosity of the formation crude oil, the density and viscosity of the injected gas, and the minimum miscible pressure of the injected gas and the formation crude oil.
By using the PVT model, the density and viscosity of the simulated oil and the injected gas of the fluid with any number of components combined in any proportion under different formation pressures and the minimum miscible pressure of the injected oil and the simulated oil can be calculated.
In specific implementation, the PVT model can be established by fitting the physical property parameters of the actual reservoir fluid by using reservoir numerical simulation software, and the specific establishment mode of the PVT model is not limited by the invention.
In specific implementation, the oil-gas miscible degree index lambda of the actual oil reservoir condition is calculated by the following formulaOil reservoir
λOil reservoir＝POil reservoir/PMMP-oil pool。
In specific implementation, the gas injection gravity standard η for actual reservoir conditions is calculated by the following formulaOil reservoir
Wherein the content of the first and second substances,
the density difference between the crude oil in the stratum and the injected gas represents the influence of gravity overburden, and the longitudinal nonuniformity of a gas injection section is represented;
the difference between the viscosity of the crude oil in the stratum and the viscosity of the injected gas represents the influence of viscous fingering, and the gas injection section plane nonuniformity is represented.
And 150, preparing an experimental fluid for a gas injection and oil displacement physical simulation experiment according to the components and the compositions of the adjusted simulated oil and the injected gas.
The oil-gas miscible degree index of the experimental condition and the actual oil reservoir condition is the same by adjusting the components and the compositions of the simulated oil and the injected gas of the experimental condition, namely: ratio lambda of experimental working pressure to minimum miscible phase pressure of injected gas and simulated oil under experimental conditionsExperiment of＝PExperiment of/PMMP-assayAnd the ratio lambda of the formation pressure to the minimum miscible pressure of the injected gas and the crude oil in the formation under actual reservoir conditionsOil reservoir＝POil reservoir/PMMP-oil poolThe same is true. Therefore, the interaction degree of the injected gas and the simulated oil under the experimental condition and the interaction degree of the injected gas and the crude oil of the stratum under the actual oil reservoir condition can be representedThe action degrees are similar.
The components and the compositions of the simulated oil and the injected gas under the experimental conditions are adjusted, and simultaneously the gas injection gravity standard numbers under the experimental conditions and the actual oil reservoir conditions are ensured to be the same, namely, the ratio η of the density difference and the viscosity difference of the simulated oil and the injected gas under the experimental conditionsExperiment ofη ratio of density difference to viscosity difference between crude oil and injected gas in actual reservoir conditionsOil reservoirThe same is true. Therefore, the relativity of longitudinal and transverse migration of injected gas under experimental conditions can be kept consistent with that under actual oil reservoir conditions, so that the phenomena of gravity override (gravity override is caused by density difference of crude oil and injected gas and represents longitudinal nonuniformity of a gas injection section) and viscous fingering (viscous fingering is caused by viscosity difference of crude oil and injected gas and represents plane nonuniformity of the gas injection section) in the gas injection process of an actual oil reservoir can be better simulated.
Compared with the existing research method and evaluation index, the oil-gas miscible degree index and the gas injection gravity standard realize that the gas injection oil displacement process under the experimental condition is similar to the actual oil reservoir condition, and the experimental result has more convincing power and reliability and has more guidance value for the oil field site.
In an embodiment of the present invention, as shown in fig. 2, the step 140 of adjusting the components and compositions of the simulated oil and the injected gas in the experiment includes:
220, according to the components and the compositions of the simulated oil and the injected gas in the adjusted experiment, the oil-gas miscible degree index lambda of the PVT model and the actual oil reservoir conditionOil reservoirCalculating the experimental working pressure PExperiment of。
In detail, as shown in fig. 3, the oil-gas miscibility degree index λ is obtained according to the composition and composition of the simulated oil and injected gas, the PVT model and the actual reservoir conditions in the adjusted experimentOil reservoirCalculating the experimental working pressure PExperiment ofThe process comprises the following steps:
PExperiment of＝PMMP-assayλExperiment of，λExperiment of＝λOil reservoir。
In detail, as shown in fig. 4, the working pressure P is determined according to the experimentExperiment ofAnd PVT model, calculation of gas injection G-standard η for experimental conditionsExperiment ofThe process comprises the following steps:
231, at the experimental working pressure PExperiment ofNext, using a PVT model, the density and viscosity of the simulated oil and injected gas were calculated.
Step 232 calculates the gas injection weight standard η for the experimental conditions based on the density and viscosity of the simulated oil and injected gas by the following equationExperiment of：
Wherein the content of the first and second substances,
is to simulate the density difference between the oil and the injected gas,
is the difference in viscosity between the simulated oil and the injected gas.
Based on the same inventive concept, the embodiment of the invention also provides a device for determining the gas injection flooding experimental fluid, which is described in the following embodiment. Because the principle of solving the problems of the device is similar to the determination method of the gas injection flooding experimental fluid, the implementation of the device can refer to the implementation of the determination method of the gas injection flooding experimental fluid, and repeated parts are not repeated.
As shown in fig. 5, the apparatus for determining a gas injection flooding experimental fluid includes:
and the modeling module 510 is used for establishing a PVT model according to the actual reservoir fluid physical property parameters. In detail, the actual reservoir fluid physical parameters at least include: the formation pressure, the composition and composition of the formation crude oil and the injected gas, the density and viscosity of the formation crude oil, the density and viscosity of the injected gas, and the minimum miscible pressure of the injected gas and the formation crude oil.
A first calculation module 520 for calculating the formation pressure P based on actual reservoir conditionsOil reservoirAnd minimum miscible pressure P of the injected gas and the formation crude oilMMP-oil poolAnd calculating the oil-gas miscible degree index lambda of the actual oil reservoir conditionOil reservoir. In specific implementation, the first calculation module calculates the oil-gas miscible degree index lambda of the actual oil reservoir condition through the following formulaOil reservoir：λOil reservoir＝POil reservoir/PMMP-oil pool。
A second calculating module 530, configured to calculate a gas injection gravity norm η of the actual reservoir condition according to a density difference and a viscosity difference between the formation crude oil and the injected gas of the actual reservoir conditionOil reservoirIn particular implementation, the second calculation module calculates the gas injection gravity level η for the actual reservoir conditions by the following equationOil reservoir：
Wherein the content of the first and second substances,
is the density difference between the crude oil in the stratum and the injected gas,
is the difference in viscosity between the formation crude oil and the injected gas.
An adjusting module 540, configured to use the oil-gas miscible degree index λ of the actual reservoir condition according to the components and compositions of the formation crude oil and the injected gas of the actual reservoir condition and the PVT modelOil reservoirAnd gas injection gravity norm ηOil reservoirOil-gas miscible degree index lambda of experimental conditions respectivelyExperiment ofAnd gas injection gravity norm ηExperiment ofThe components and compositions of simulated oil and injected gas in the experiment are adjusted to be the same as the target;
and a configuration module 550 configured to configure the experimental fluid according to the adjusted components and compositions of the simulated oil and the injected gas.
In the embodiment, the components and the compositions of the simulated oil and the injected gas under the experimental condition are adjusted, so that the oil-gas miscible degree indexes under the experimental condition and the actual oil reservoir condition are the same, and the interaction degree of the injected gas and the simulated oil under the experimental condition is similar to the interaction degree of the injected gas and the formation crude oil under the actual oil reservoir condition. The gas injection gravity accuracy of the experimental condition and the actual oil reservoir condition is the same, the relativity of longitudinal and transverse migration of injected gas under the experimental condition can be kept consistent with that under the actual oil reservoir condition, and therefore the gravity override and viscous finger advance phenomena in the actual oil reservoir gas injection process can be better simulated.
In an embodiment of the present invention, as shown in fig. 6, the adjusting module 540 includes:
the trial adjustment unit 610 is used for adjusting the components and the compositions of the simulated oil and the injected gas in the experiment according to the components and the compositions of the formation crude oil and the injected gas under the actual oil reservoir conditions;
a pressure calculating unit 620 for calculating the oil-gas miscible degree index lambda according to the components and compositions of the simulated oil and the injected gas, the PVT model and the actual reservoir conditions in the adjusted experimentOil reservoirCalculating the experimental working pressure PExperiment of；
A gas injection gravity standard number calculation unit 630 for calculating the gas injection gravity standard number according to the experimental working pressure PExperiment ofAnd PVT model, calculation of gas injection G-standard η for experimental conditionsExperiment of；
A judging unit 640 for judging the gas injection gravity standard η of the experimental conditionsExperiment ofGas injection gravity norm η corresponding to actual reservoir conditionsOil reservoirAnd if the difference is within the preset range, preparing the experimental fluid according to the components and the compositions of the simulated oil and the injected gas in the adjusted experiment, and otherwise, returning to readjust the components and the compositions of the simulated oil and the injected gas in the experiment.
In specific implementation, the pressure calculation unit 620 calculates the oil-gas miscible degree index λ according to the components and compositions of the simulated oil and the injected gas in the adjusted experiment, the PVT model and the actual reservoir conditionsOil reservoirCalculating the experimental working pressure PExperiment ofThe process comprises the following steps:
calculating the minimum miscible pressure P of the injected gas and the simulated oil by using a PVT model according to the components and the compositions of the simulated oil and the injected gas in the adjusted experimentMMP-assay；
According to the minimum miscible pressure P of injected gas and simulated oilMMP-assayOil-gas miscible degree index lambda with actual reservoir conditionsOil reservoirCalculating the experimental working pressure PExperiment of。
The gas injection gravity standard number calculation unit 630 calculates the working pressure P according to the experimentExperiment ofAnd PVT model, calculation of gas injection G-standard η for experimental conditionsExperiment ofThe process comprises the following steps:
at experimental working pressure PExperiment ofCalculating the density and viscosity of the simulated oil and the injected gas by using a PVT model;
the gas injection gravity standard η for the experimental conditions was calculated from the density and viscosity of the simulated oil and injected gasExperiment of。
In order to more clearly illustrate the technical solution of the present invention, the present invention is further explained by a specific example. According to the actual situation of the target reservoir, determining the parameter values as follows:
oil reservoir temperature: at 84 ℃;
formation pressure: pOil reservoir＝63.439MPa；
Minimum miscible pressure of injected gas with formation crude oil: pMMP-oil pool＝52MPa；
Formation crude oil saturation pressure: psat-reservoir＝51MPa；
The formation crude oil densities and viscosities at different pressures are shown in table 1.
TABLE 1 crude oil Density and viscosity for different pressure formations
| P/MPa | μo-reservoir/mPa·s | ρo-Res/g·cm-3 |
| 66.327 | 0.516 | 0.727 |
| 63.439 | 0.502 | 0.723 |
| 60.204 | 0.487 | 0.719 |
| 57.143 | 0.473 | 0.714 |
| 54.082 | 0.458 | 0.709 |
| 51.235 | 0.449 | 0.705 |
The composition and composition of the crude oil and the injected gas in the formation are shown in table 2.
TABLE 2 composition and composition of formation crude oil and injection gas
Specifically, the method for determining the gas injection flooding experimental fluid specifically comprises the following steps:
and a, performing saturation pressure calculation, multiple contact calculation and flash calculation by using a WinProp module of oil reservoir numerical simulation software CMG, comparing with experimental data, correcting, and constructing a PVT model. The fitting results are shown in table 3.
TABLE 3 comparison of the physical parameters of the crude oil in the stratum with the actual results
| P/MPa | μo-computation/mPa·s | μo-reservoir/mPa·s | ρo-computation/g·cm-3 | ρo-reservoir/g·cm-3 |
| 66.327 | 0.511 | 0.516 | 0.730 | 0.727 |
| 63.439 | 0.500 | 0.501 | 0.725 | 0.725 |
| 60.204 | 0.490 | 0.487 | 0.720 | 0.719 |
| 57.143 | 0.479 | 0.473 | 0.714 | 0.714 |
| 54.082 | 0.468 | 0.458 | 0.708 | 0.709 |
| 51.235 | 0.458 | 0.449 | 0.702 | 0.705 |
| Temperature/. degree.C | PMMP-calculation/MPa | PMMP-oil pool/MPa | Psat-calculation/MPa | Psat-reservoir/MPa |
| 84 | 52.3 | 52 | 50.21 | 51 |
B, according to the formation pressure P of the target oil reservoirOil reservoirAnd minimum miscible pressure P of injected gas and crude oil in formationMMP-oil poolAnd calculating the oil-gas miscible degree index lambda of the actual oil reservoir conditionOil reservoir。
λOil reservoir＝POil reservoir/PMMP-oil pool＝63.439MPa/52MPa＝1.220。
And c, calculating the density and viscosity of the injected gas under the actual oil reservoir conditions by using the PVT model established in the step a, and referring to a table 4.
TABLE 4 results of injected gas density and viscosity calculations at formation pressure
| POil reservoir/MPa | μg-reservoir/mPa·s | ρg-reservoir/g·cm-3 |
| 63.439 | 0.078 | 0.602 |
Calculating the gas injection gravity standard η of the actual oil reservoir condition by combining the density and viscosity of the formation crude oil under the actual oil reservoir conditionOil reservoir：
ηOil reservoir＝Δρo-g/Δμo-g＝(0.725-0.602)/(0.501-0.078)＝0.291。
Step d, adjusting the components and the compositions of the simulated oil and the injected gas in the experiment according to the components and the compositions of the crude oil and the injected gas in the stratum in the table 2, and calculating the minimum miscible pressure P of the injected gas and the simulated oil under the experiment conditions by utilizing the PVT model established in the step aMMP-assay(ii) a Combining the oil-gas miscible degree index lambda of the actual reservoir conditions calculated in the step bOil reservoirThe experimental working pressure P can be obtainedExperiment of。
Step e, utilizing the PVT model established in the step a to test the working pressure PExperiment ofThen, the density and viscosity of the simulated oil and the injected gas under the experimental conditions are calculated, and the ratio η of the density difference and the viscosity difference of the simulated oil and the injected gas is further calculatedExperiment ofIf ηExperiment of-ηOil reservoirThe | is less than or equal to 0.001, and the calculation is finished; if not, returning to the step d, and readjusting the components and the compositions of the simulated oil and the injected gas in the indoor experiment. The results of the fluid-related parameters for the experimental conditions obtained by the final calculations are as follows.
(1) The adjusted experimental simulated oil and injected gas compositions and compositions are shown in table 5.
Table 5 components and compositions of experimental simulated oils and injected gases
| Composition (I) | Crude oil/mol% | Injection gas/mol% |
| CO2 | 63.17 | 90.91 |
| N2 | 6.32 | 9.09 |
| C3 | 0.13 | 0 |
| IC4 | 0.07 | 0 |
| NC4 | 0.26 | 0 |
| IC5 | 0.21 | 0 |
| NC5 | 0.41 | 0 |
| C6 | 0.95 | 0 |
| C7 | 1.88 | 0 |
| C8 | 2.46 | 0 |
| C9 | 2.03 | 0 |
| C10 | 1.66 | 0 |
| C11 | 1.44 | 0 |
| C12 | 1.30 | 0 |
| C13 | 1.36 | 0 |
| C14 | 1.10 | 0 |
| C15 | 1.03 | 0 |
| C16 | 0.83 | 0 |
| C17 | 0.70 | 0 |
| C18 | 0.75 | 0 |
| C19 | 0.67 | 0 |
| C20 + | 11.26 | 0 |
(2) Minimum miscible pressure of injected gas and simulated oil for experimental conditions: pMMP-assay＝21MPa；
(3) Experimental working pressure: pExperiment of＝PMMP-assay×λExperiment of＝PMMP-assay×λOil reservoir＝21MPa×1.220＝25.62MPa；
(4) The simulated oil and injected gas densities and viscosities at the experimental operating pressures are shown in table 6.
Table 6 results of calculation of density and viscosity of simulated oil and injected gas at experimental operating pressure
| P/MPa | μo-experiment/mPa·s | μg-experiment/mPa·s | ρo-experiment/g·cm-3 | ρg-experiment/g·cm-3 |
| 25.62 | 1.079 | 0.044 | 0.847 | 0.545 |
(5) According to Table 5, the experimental conditions gas injection weight standard η was calculatedExperiment of(0.847-0.545)/(1.079-0.044) 0.292, η as measured by the actual reservoir condition gas injection weight calculated in step bOil reservoirDifference | η betweenExperiment of-ηOil reservoirAnd the | < 0.001, which shows that the debugging results of the components and the compositions of the experimental simulation oil and the injected gas in the table 6 meet the pressure similarity criterion, and can be used for carrying out gas injection oil displacement physical simulation experiments.
And f, preparing experimental fluid according to the components and the compositions (shown in table 5) of the simulated oil and the injected gas meeting the requirements, and using the experimental fluid for a gas injection oil displacement physical simulation experiment. Wherein, the composition of the experimental simulation oil and the injected gas does not contain CH in the stratum crude oil and the injected gas under the actual oil reservoir condition4The components (see table 2), and the experimental working pressure is reduced to 25.62MPa from 63.439MPa of the actual reservoir formation pressure, so that the safety risk of experimental operation is effectively reduced, and the guidance value of the experimental result is ensured.
In some embodiments of the present invention, there is also provided a computer apparatus, including a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor, when executing the computer program, implements the method for determining a gas injection flooding experimental fluid according to any of the foregoing embodiments.
In some embodiments of the present invention, a computer-readable storage medium is further provided, where the computer-readable storage medium stores a computer program for execution, and when the computer program is executed by a processor, the method for determining a gas injection flooding experimental fluid according to any one of the foregoing embodiments is implemented.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only for the purpose of illustrating the present invention, and any person skilled in the art can modify and change the above embodiments without departing from the spirit and scope of the present invention. Therefore, the scope of the claims should be accorded the full scope of the claims.
Claims (8)
1. A method for determining a gas injection oil displacement experiment fluid is characterized by comprising the following steps:
establishing a PVT model according to actual oil reservoir fluid physical property parameters;
formation pressure P according to actual reservoir conditionsOil reservoirAnd minimum miscible pressure P of the injected gas and the formation crude oilMMP-oil poolBy the formula λOil reservoir＝POil reservoir/PMMP-oil poolAnd calculating to obtain the oil-gas miscible degree index lambda of the actual oil reservoir conditionOil reservoir；
According to the density difference and viscosity difference of the formation crude oil and the injected gas under the actual oil reservoir conditions, the formula η is usedOil reservoir＝Δρo-g reservoir/Δμo-g reservoirAnd calculating to obtain the gas injection gravity standard η of the actual oil reservoir conditionOil reservoirWhere Δ ρo-g reservoirIs the density difference, Δ μ, between the crude oil in the formation and the injected gaso-g reservoirIs the viscosity difference between the crude oil in the stratum and the injected gas;
according to the components and the compositions of the stratum crude oil and the injected gas under the actual oil reservoir condition and a PVT model, the oil-gas miscible degree index lambda under the actual oil reservoir condition is usedOil reservoirAnd gas injection gravity norm ηOil reservoirOil-gas miscible degree index lambda of experimental conditions respectivelyExperiment ofAnd gas injection gravity norm ηExperiment ofThe components and compositions of simulated oil and injected gas in the experiment are adjusted to be the same as the target;
and preparing the experimental fluid according to the components and the compositions of the adjusted simulated oil and the injected gas.
2. The method of claim 1, wherein the actual reservoir fluid property parameters comprise at least: formation pressure POil reservoirThe components and the compositions of the formation crude oil and the injected gas, the density and the viscosity of the formation crude oil, the density and the viscosity of the injected gas, and the minimum miscible pressure P of the injected gas and the formation crude oilMMP-oil pool。
3. The method of claim 1, wherein adjusting the composition and composition of the simulated oil and injected gas in the experiment comprises:
adjusting the components and compositions of simulated oil and injected gas in the experiment according to the components and compositions of the crude oil and the injected gas in the stratum under the actual oil reservoir conditions;
according to the components and compositions of simulated oil and injected gas in the adjusted experiment, the oil-gas miscible degree index lambda of the PVT model and the actual oil reservoir conditionsOil reservoirCalculating the experimental working pressure PExperiment of；
According to experimental working pressure PExperiment ofAnd PVT model, calculation of gas injection G-standard η for experimental conditionsExperiment of；
Determination of gas injection gravity norm η for Experimental conditionsExperiment ofGas injection gravity norm η corresponding to actual reservoir conditionsOil reservoirAnd if the difference is within the preset range, finishing the adjustment of the components and the compositions of the simulated oil and the injected gas in the experiment, and otherwise, returning to readjust the components and the compositions of the simulated oil and the injected gas in the experiment.
4. The method of claim 3, wherein the oil-gas miscibility index λ is based on the composition and composition of the simulated oil and injected gas, the PVT model, and the actual reservoir conditions in the adjusted experimentOil reservoirCalculating the experimental working pressure PExperiment ofThe process comprises the following steps:
calculating the minimum miscible pressure P of the injected gas and the simulated oil by using a PVT model according to the components and the compositions of the simulated oil and the injected gas in the adjusted experimentMMP-assay；
According to injected gas and simulated oilMinimum miscible pressure PMMP-assayOil-gas miscible degree index lambda with actual reservoir conditionsOil reservoirBy the formula PExperiment of＝PMMP-assayλExperiment of，λExperiment of＝λOil reservoirCalculating the experimental working pressure PExperiment of。
5. A method according to claim 3, characterised in that the experimental working pressure P is based onExperiment ofAnd PVT model, calculation of gas injection G-standard η for experimental conditionsExperiment ofThe process comprises the following steps:
at experimental working pressure PExperiment ofCalculating the density and viscosity of the simulated oil and the injected gas by using a PVT model;
density and viscosity of the simulated oil and injected gas, via equation ηExperiment of＝Δρo-g experiment/Δμo-g experimentCalculating the gas injection gravity standard η of the experimental conditionsExperiment ofWhere Δ ρo-g experimentIs the density difference, Δ μ, between the simulated oil and the injected gaso-g experimentIs the difference in viscosity between the simulated oil and the injected gas.
6. A gas injection displacement of reservoir oil experiment fluidic definitional device which characterized in that includes:
the modeling module is used for establishing a PVT model according to the physical property parameters of the actual oil reservoir fluid;
a first calculation module for calculating the formation pressure P according to the actual reservoir conditionsOil reservoirAnd minimum miscible pressure P of the injected gas and the formation crude oilMMP-oil poolBy the formula λOil reservoir＝POil reservoir/PMMP-oil poolAnd calculating to obtain the oil-gas miscible degree index lambda of the actual oil reservoir conditionOil reservoir；
A second calculation module for calculating the density difference and viscosity difference of the crude oil and the injected gas according to the actual oil reservoir conditions by using a formula ηOil reservoir＝Δρo-g reservoir/Δμo-g reservoirAnd calculating to obtain the gas injection gravity standard η of the actual oil reservoir conditionOil reservoirWhere Δ ρo-g reservoirIs the density difference between the crude oil in the stratum and the injected gas，Δμo-g reservoirIs the viscosity difference between the crude oil in the stratum and the injected gas;
an adjusting module for adjusting the oil-gas miscible degree index lambda of the actual oil reservoir condition according to the components and the compositions of the stratum crude oil and the injected gas of the actual oil reservoir condition and the PVT modelOil reservoirAnd gas injection gravity norm ηOil reservoirOil-gas miscible degree index lambda of experimental conditions respectivelyExperiment ofAnd gas injection gravity norm ηExperiment ofThe components and compositions of simulated oil and injected gas in the experiment are adjusted to be the same as the target;
and the configuration module is used for configuring the experimental fluid according to the components and the compositions of the adjusted simulation oil and the injected gas.
7. A computer apparatus comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor when executing the computer program implements the method of determining a gas injection flooding experimental fluid of any one of claims 1 to 5.
8. A computer readable storage medium, characterized in that the computer readable storage medium stores an executable computer program, which when executed by a processor, implements the method of determining a gas injection flooding experimental fluid of any one of claims 1 to 5.
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