CN113552036A - Method and device for determining oil-water relative permeability of medium-low pore permeability reservoir - Google Patents
Method and device for determining oil-water relative permeability of medium-low pore permeability reservoir Download PDFInfo
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Abstract
The invention provides a method and a device for determining the relative oil-water permeability of a medium-low pore-permeability reservoir, wherein the method comprises the following steps: obtaining the oil phase permeability and the water phase permeability of the rock core sample of the medium-low pore permeability reservoir; determining the steady-state oil-water relative permeability of the core sample according to the oil phase permeability and the water phase permeability of the core sample; performing characteristic analysis on the steady-state oil-water relative permeability of the core sample to obtain the following components of the core sample: a relationship between oil phase permeability and oil saturation, a relationship between water phase permeability and water saturation; according to the core sample: and determining the relative oil-water permeability of the medium-low pore-permeability reservoir to be detected according to the relationship between the oil phase permeability and the oil saturation and the relationship between the water phase permeability and the water saturation. The method can obtain the medium-low pore permeability reservoir oil-water relative permeability with higher calculation precision.
Description
Technical Field
The invention relates to the technical field of logging evaluation of petroleum exploration, in particular to a method and a device for determining the relative oil-water permeability of a medium-low pore permeability reservoir.
Background
The oil-water relative permeability is an important parameter for describing the seepage characteristics of a reservoir of an oil-gas reservoir, a curve of the oil-water relative permeability is a basis for researching oil-water two-phase seepage, and the curve form reflects the pore structure of the reservoir, the oil-water distribution state, the oil-water movement rule and the like. The oil-water relative permeability under the experimental condition is generally given in a table form of discrete data, and a large amount of continuous phase permeability data is needed in actual work, so that researchers at home and abroad obtain numerous mathematical models of oil-water relative permeability in a driving and discharging process and an imbibition process according to a large amount of oil-water relative permeability experimental data and an oil-water flowing process. In the models, the displacement process reflects the change of oil-water relative permeability in the formation process of an oil reservoir, the imbibition process reflects the change of oil-water relative permeability in the development process of an oil field, and the imbibition model is mainly applied to the development of the oil field.
At present, a Willhite model is mostly adopted in an oil field, and the Willhite model has the advantage of well solving the problem that the oil and water phase permeability of a residual oil end and a bound water end is 0 respectively, so that the Willhite model is very convenient and fast to compare the permeability change characteristics of different reservoirs or oil reservoirs.
In oil field production, because the low-saturation oil layer is difficult to identify and evaluate in medium-low pore permeability, the low-saturation oil layer is generally identified and evaluated by means of a water content parameter. However, in the steady-state phase permeability experimental study of the rock of the medium-low permeability reservoir, it is found that when the Willhite model is used for data fitting, a large calculation precision error occurs in most cases, and the oil-water relative permeability with high calculation precision cannot be obtained.
Disclosure of Invention
The embodiment of the invention provides a method for determining the relative oil-water permeability of a medium-low pore permeability reservoir, which is used for obtaining the relative oil-water permeability of the medium-low pore permeability reservoir with higher calculation precision, and comprises the following steps:
obtaining the oil phase permeability and the water phase permeability of the rock core sample of the medium-low pore permeability reservoir;
determining the steady-state oil-water relative permeability of the core sample according to the oil phase permeability and the water phase permeability of the core sample;
performing characteristic analysis on the steady-state oil-water relative permeability of the core sample to obtain the following components of the core sample: a relationship between oil phase permeability and oil saturation, a relationship between water phase permeability and water saturation;
according to the core sample: and determining the relative oil-water permeability of the medium-low pore-permeability reservoir to be detected according to the relationship between the oil phase permeability and the oil saturation and the relationship between the water phase permeability and the water saturation.
The embodiment of the invention also provides a device for determining the relative oil-water permeability of the medium-low pore permeability reservoir, which is used for obtaining the relative oil-water permeability of the medium-low pore permeability reservoir with higher calculation precision, and comprises the following components:
the data acquisition module is used for acquiring the oil phase permeability and the water phase permeability of the rock core sample of the medium-low pore permeability reservoir;
the steady-state oil-water relative permeability determining module is used for determining the steady-state oil-water relative permeability of the core sample according to the oil phase permeability and the water phase permeability of the core sample;
and the permeability relation determining module is used for performing characteristic analysis on the steady-state oil-water relative permeability of the core sample to obtain the following components of the core sample: a relationship between oil phase permeability and oil saturation, a relationship between water phase permeability and water saturation;
the oil-water relative permeability determining module is used for determining the relative permeability of the oil and water according to the core sample: and determining the relative oil-water permeability of the medium-low pore-permeability reservoir to be detected according to the relationship between the oil phase permeability and the oil saturation and the relationship between the water phase permeability and the water saturation.
According to the embodiment of the invention, the oil phase permeability and the water phase permeability of the rock core sample of the medium-low pore permeability reservoir are obtained; determining the steady-state oil-water relative permeability of the core sample according to the oil phase permeability and the water phase permeability of the core sample; performing characteristic analysis on the steady-state oil-water relative permeability of the core sample to obtain the following components of the core sample: a relationship between oil phase permeability and oil saturation, a relationship between water phase permeability and water saturation; through the core sample: and determining the relative oil-water permeability of the medium-low pore-permeability reservoir to be detected according to the relationship between the oil phase permeability and the oil saturation and the relationship between the water phase permeability and the water saturation. The calculation precision of the oil-water relative permeability of the medium-low pore permeability reservoir is improved, and further technical support is provided for the exploration and development of low-saturation oil and gas reservoirs.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts. In the drawings:
FIG. 1 is a flow chart of a method for determining relative oil-water permeability of a low-porosity reservoir in an embodiment of the invention;
FIG. 2 is a graph of a steady-state oil-water relative permeability experiment plotted according to Table 1 in an example of the present invention;
FIG. 3 is a graph comparing results of Willhite model calculation with experimental results in an embodiment of the present invention;
FIG. 4 is a graph comparing the oil-water relative permeability calculated by the method of the embodiment of the invention with the experimental results;
FIG. 5 is a diagram illustrating an example of a comparison between a calculated reservoir water content and an actual test oil water yield based on the calculated oil-water phase permeability by the method according to the embodiment of the present invention;
FIG. 6 is a block diagram of an apparatus for determining the relative oil-water permeability of a low porosity reservoir according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a method for determining the relative oil-water permeability of a medium-low pore permeability reservoir, which can obtain the relative oil-water permeability of the medium-low pore permeability reservoir with higher calculation precision. FIG. 1 is a flow chart of a method for determining the relative oil-water permeability of a low-porosity reservoir in an embodiment of the invention. As shown in fig. 1, the method for determining the relative oil-water permeability of a medium-low porosity reservoir in the embodiment of the present invention may include:
102, determining the steady-state oil-water relative permeability of the core sample according to the oil phase permeability and the water phase permeability of the core sample;
As can be seen from the flow chart shown in FIG. 1, the oil phase permeability and the water phase permeability of the core sample of the medium-low porosity and permeability reservoir are obtained in the embodiment of the invention; determining the steady-state oil-water relative permeability of the core sample according to the oil phase permeability and the water phase permeability of the core sample; performing characteristic analysis on the steady-state oil-water relative permeability of the core sample to obtain the following components of the core sample: a relationship between oil phase permeability and oil saturation, a relationship between water phase permeability and water saturation; through the core sample: and determining the relative oil-water permeability of the medium-low pore-permeability reservoir to be detected according to the relationship between the oil phase permeability and the oil saturation and the relationship between the water phase permeability and the water saturation. The calculation precision of the oil-water relative permeability of the medium-low pore permeability reservoir is improved, and further technical support is provided for the exploration and development of low-saturation oil and gas reservoirs.
In specific implementation, the oil phase permeability and the water phase permeability of the core sample of the medium-low pore permeability reservoir are obtained first, and in an embodiment, the method may include: obtaining logging response characteristics of the medium-low pore permeability reservoir core, wherein the logging response characteristics comprise: permeability and porosity; selecting a core sample of the medium-low pore permeability reservoir according to lithological description and logging response characteristics of the core of the medium-low pore permeability reservoir; and obtaining the oil phase permeability and the water phase permeability of the core sample measured based on the relative permeability and resistivity joint measurement experiment.
In an embodiment, a plunger core sample can be drilled according to the lithology description of the core for drilling and coring and the corresponding logging response characteristics such as resistivity, porosity and the like, wherein the diameter of the plunger core sample is required to be 2.5cm, and the length of the plunger core sample is more than 5 cm. In addition, the permeability of the core sample is required to be greater than 1.0mD, 3-5 core samples are guaranteed in the interval of 1-10 mD, 10-50 mD, >50mD and the like, and the universality of the experimental rule is guaranteed.
In the embodiment, the steady-state relative permeability experiment and the resistivity experiment are combined together to perform the relative permeability and resistivity joint measurement experiment, so that the resistivity of the core sample under different saturation degrees can be obtained while the data of the oil phase permeability and the water phase permeability of the core sample are obtained, and the uniformity of data sources of the two experiments is ensured.
As shown in table 1, table 1 is a set of oil phase and water phase permeability discrete data based on water saturation change obtained by a relative permeability and resistivity joint measurement experiment in the examples of the present invention.
TABLE 1
In specific implementation, after the oil phase permeability and the water phase permeability of the core sample of the medium-low pore permeability reservoir are obtained, the steady-state oil-water relative permeability of the core sample is determined according to the oil phase permeability and the water phase permeability of the core sample. In an embodiment, a steady-state oil-water relative permeability curve may be drawn based on the oil phase permeability and the water phase permeability of the core sample.
As shown in FIG. 2, FIG. 2 is a graph of the steady state oil-water relative permeability experiment according to Table 1 in the example of the present invention. In the figure, KroAs oil phase permeability, KrwIs the water phase permeability, SwThe water saturation.
In specific implementation, after determining the steady-state oil-water relative permeability of the core sample, performing characteristic analysis on the steady-state oil-water relative permeability of the core sample to obtain the following characteristics of the core sample: the relationship between oil phase permeability and oil saturation, and the relationship between water phase permeability and water saturation.
In an embodiment, the characteristic analysis may be performed on the steady-state oil-water relative permeability of the core sample, and based on a binary log linear regression method, the following of the core sample are obtained: the relationship between oil phase permeability and oil saturation, and the relationship between water phase permeability and water saturation. In the embodiment, the change rule of the oil-water phase permeability can be obtained by analyzing the characteristic of the steady-state oil-water relative permeability curve; and determining the change rule of the oil-water phase permeability in a stable state in the core physical property change distribution range, and establishing a relational expression between the oil-water phase permeability by a mathematical modeling means based on a binary logarithm linear regression method.
Of the core samples obtained: the relationship between oil phase permeability and oil saturation, and the relationship between water phase permeability and water saturation are as follows:
oil phase permeability: log (K)ro/Kro(Swi))＝Ao(log(SoD))2+Bolog(SoD)；
Water phase permeability: log (K)rw/Krw(Sor))＝Aw(log(SwD))2+Bwlog(SwD)；
Wherein: kroAs oil phase permeability, KrwAs water phase permeability, Kro(Swi) Oil phase permeability in a water-bound state; krw(Sor) Water phase permeability in the residual oil state, SwiFor rock irreducible water saturation, SorAs rock residual oil saturation, SoDTo normalize oil saturation, SwDTo normalize the water saturation, SoD＝1-SwD，Ao、Aw、Bo、BwIs an index of the pore structure of rock
The relevant coefficients, K is the permeability and φ is the porosity.
Wherein A iso、Aw、Bo、BwThe expression (c) is specifically as follows:
in the examples, the steady state relative permeability experimental data of each core sample was verified by using Willhite empirical formula model. The results are shown in fig. 3, and fig. 3 is a comparison graph of the wilhite model calculation results and the experimental results in the example of the present invention. In the figure, KroAs oil phase permeability, KrwAs water phase permeability, Kro(Swi) Oil phase permeability in a water-bound state; krw(Sor) Water phase permeability in the residual oil state, SwiFor rock irreducible water saturation, SorAs rock residual oil saturation, SoDTo normalize oil saturation, SwDTo normalize the water saturation, SoD＝1-SwD. As can be seen, the Willhite model has a large error near one end point of the calculated saturation. By the core sample obtained: the relationship between oil phase permeability and oil saturation, and the relationship between water phase permeability and water saturation, verified the experimental data and compared with the experimental results, as shown in fig. 4. FIG. 4 is a graph comparing the oil-water relative permeability calculated by the method of the embodiment of the invention with the experimental results. As can be seen from the figure, the difference between the calculation result and the experimental result is distributed within an acceptable error range, and the requirement of calculation accuracy is met. The core samples obtained in the examples of the invention were thus considered to be: the relation between the oil phase permeability and the oil saturation is suitable for the requirement of calculating the relative oil-water permeability of the medium-low pore permeability reservoir.
In particular implementation, in obtaining a core sample: after the relationship between the oil phase permeability and the oil saturation and the relationship between the water phase permeability and the water saturation, according to the core sample: and determining the relative oil-water permeability of the medium-low pore-permeability reservoir to be detected according to the relationship between the oil phase permeability and the oil saturation and the relationship between the water phase permeability and the water saturation.
In the embodiment, the pore structure index of the medium-low pore permeability reservoir to be detected can be determined according to the porosity and the permeability of the medium-low pore permeability reservoir to be detected; determining the water saturation of the medium-low pore permeability reservoir to be detected according to the resistivity, the cementation index and the saturation index of the medium-low pore permeability reservoir to be detected; according to the pore structure index and the water saturation of the medium-low pore-permeability reservoir to be detected and the core sample: and determining the relative oil-water permeability of the medium-low pore-permeability reservoir to be detected according to the relationship between the oil phase permeability and the oil saturation and the relationship between the water phase permeability and the water saturation.
In the embodiment, a batch of medium-low pore permeability and low saturation oil layer wells to be detected are selected, the parameters of the reservoir to be detected are calculated by a conventional method, and the physical properties of the reservoir to be detected are obtained and comprise: the permeability and the porosity are used for calculating the index of the pore structure of the reservoir to be detected; calculating the water saturation of the reservoir to be measured by adopting an Archie formula; according to the core sample: and calculating the relative permeability of the oil and water to be measured according to the relationship between the oil phase permeability and the oil saturation and the relationship between the water phase permeability and the water saturation.
Wherein, the Archie formula is shown as the following formula:
in the formula: swAs the degree of water saturation, RtFor formation resistivity, φ is porosity, m is the cementation exponent, n is the saturation exponent, and a, b are constants, typically 1.0.
In specific implementation, after the oil-water relative permeability of the medium-low pore permeability reservoir to be detected is determined, the water content of the medium-low pore permeability reservoir to be detected can be determined according to the oil-water relative permeability of the medium-low pore permeability reservoir to be detected.
In the embodiment, the water content of the medium and low pore permeability reservoir to be detected can be determined according to the oil-water relative permeability, the oil viscosity and the water viscosity of the medium and low pore permeability reservoir to be detected. And judging the output state of the reservoir fluid to be detected through the calculated water content.
Wherein, the water content of the medium and low pore permeability reservoir to be detected can be determined according to the following formula:
in the formula: f. ofwThe water content of the medium and low pore permeability reservoir to be detected is determined; mu.swIs the oil viscosity mu of the reservoir with medium and low pore permeability to be measuredoThe water viscosity of the medium-low pore permeability reservoir to be detected is obtained; the oil-water relative permeability of the medium-low pore permeability reservoir to be detected comprises the following steps: measuring the oil phase permeability and the water phase permeability of the medium-low pore permeability reservoir, wherein K isroThe oil phase permeability K of the reservoir with medium and low pore permeability to be measuredrwThe water phase permeability of the medium and low pore permeability reservoir to be measured.
As shown in fig. 5, fig. 5 is an example graph comparing the water content of the reservoir calculated based on the oil-water phase permeability calculated by the method of the embodiment of the present invention with the actual water yield of the test oil in the embodiment of the present invention, in which in layer 58, the test oil result is a pure oil layer, and the calculated water content is 3%, which is very consistent with the actual result. The method provided by the embodiment of the invention can accurately calculate the relative oil-water permeability of the medium-low pore reservoir, further accurately calculate the water content, and use the water content for evaluating the low-saturation oil layer to provide technical support for the exploration and development of the low-saturation oil-gas reservoir.
Based on the same inventive concept, the embodiment of the invention also provides a device for determining the relative oil-water permeability of the medium-low pore-permeability reservoir, which is described in the following embodiment. Because the principle of solving the problem of the device for determining the relative oil-water permeability of the medium-low pore permeability reservoir is similar to the method for determining the relative oil-water permeability of the medium-low pore permeability reservoir, the implementation of the device for determining the relative oil-water permeability of the medium-low pore permeability reservoir can be referred to the implementation of the method for determining the relative oil-water permeability of the medium-low pore permeability reservoir, and repeated parts are not described again.
FIG. 6 is a block diagram of an apparatus for determining the relative oil-water permeability of a low porosity reservoir according to an embodiment of the present invention. As shown in fig. 6, in an embodiment of the present invention, the apparatus for determining the relative oil-water permeability of a hypotonic reservoir may include:
the data acquisition module 601 is used for acquiring the oil phase permeability and the water phase permeability of the core sample of the medium-low pore permeability reservoir;
the steady-state oil-water relative permeability determining module 602 is configured to determine the steady-state oil-water relative permeability of the core sample according to the oil phase permeability and the water phase permeability of the core sample;
a permeability relation determining module 603, configured to perform characteristic analysis on the steady-state oil-water relative permeability of the core sample, to obtain: a relationship between oil phase permeability and oil saturation, a relationship between water phase permeability and water saturation;
an oil-water relative permeability determining module 604, configured to determine, based on the core sample: and determining the relative oil-water permeability of the medium-low pore-permeability reservoir to be detected according to the relationship between the oil phase permeability and the oil saturation and the relationship between the water phase permeability and the water saturation.
In an embodiment, the data obtaining module may be specifically configured to:
obtaining logging response characteristics of the medium-low porosity permeability reservoir core, wherein the logging response characteristics comprise: permeability and porosity; selecting a core sample of the medium-low pore permeability reservoir according to the lithological description of the core of the medium-low pore permeability reservoir and the logging response characteristics; and obtaining the oil phase permeability and the water phase permeability of the core sample measured based on the relative permeability and resistivity joint measurement experiment.
In an embodiment, the permeability relationship determining module may be specifically configured to: performing characteristic analysis on the steady-state oil-water relative permeability of the core sample, and obtaining the following components of the core sample based on a binary logarithm linear regression method: the relationship between oil phase permeability and oil saturation, and the relationship between water phase permeability and water saturation.
In an embodiment, the permeability relationship determining module may be further specifically configured to:
obtaining a core sample: the relationship between oil phase permeability and oil saturation, and the relationship between water phase permeability and water saturation are as follows:
oil phase permeability: log (K)ro/Kro(Swi))＝Ao(log(SoD))2+Bolog(SoD)；
Water phase permeability: log (K)rw/Krw(Sor))＝Aw(log(SwD))2+Bwlog(SwD)；
Wherein: kroAs oil phase permeability, KrwAs water phase permeability, Kro(Swi) Oil phase permeability in a water-bound state; krw(Sor) Water phase permeability in the residual oil state, SwiFor rock irreducible water saturation, SorAs rock residual oil saturation, SoDTo normalize oil saturation, SwDTo normalize the water saturation, SoD＝1-SwD，Ao、Aw、Bo、BwIs an index of the pore structure of rock
The relevant coefficients, K is the permeability and φ is the porosity.
In an embodiment, the oil-water relative permeability module may be specifically configured to:
determining the pore structure index of the medium and low pore permeability reservoir to be detected according to the porosity and the permeability of the medium and low pore permeability reservoir to be detected; determining the water saturation of the medium-low pore permeability reservoir to be detected according to the resistivity, the cementation index and the saturation index of the medium-low pore permeability reservoir to be detected; according to the pore structure index and the water saturation of the medium-low pore-permeability reservoir to be detected and the core sample: and determining the relative oil-water permeability of the medium-low pore-permeability reservoir to be detected according to the relationship between the oil phase permeability and the oil saturation and the relationship between the water phase permeability and the water saturation.
In an embodiment, the determining device for the relative oil-water permeability of the medium-low pore permeability reservoir may further include:
and the water content determination module is used for determining the water content of the medium-low pore permeability reservoir to be detected according to the relative oil-water permeability of the medium-low pore permeability reservoir to be detected.
In an embodiment, the water content module may be specifically configured to determine the water content of the to-be-detected medium-low pore permeability reservoir according to the oil-water relative permeability, the oil viscosity, and the water viscosity of the to-be-detected medium-low pore permeability reservoir.
In an embodiment, the water cut module may be further specifically configured to:
determining the water content of the medium-low pore permeability reservoir to be detected according to the following formula:
in the formula: f. ofwThe water content of the medium and low pore permeability reservoir to be detected is determined; mu.swIs the oil viscosity mu of the reservoir with medium and low pore permeability to be measuredoThe water viscosity of the medium-low pore permeability reservoir to be detected is obtained; the oil-water relative permeability of the medium-low pore permeability reservoir to be detected comprises the following steps: measuring the oil phase permeability and the water phase permeability of the medium-low pore permeability reservoir, wherein K isroThe oil phase permeability K of the reservoir with medium and low pore permeability to be measuredrwThe water phase permeability of the medium and low pore permeability reservoir to be measured.
In summary, in the embodiment of the invention, the oil phase permeability and the water phase permeability of the core sample of the medium-low pore permeability reservoir are obtained; determining the steady-state oil-water relative permeability of the core sample according to the oil phase permeability and the water phase permeability of the core sample; performing characteristic analysis on the steady-state oil-water relative permeability of the core sample to obtain the following components of the core sample: a relationship between oil phase permeability and oil saturation, a relationship between water phase permeability and water saturation; through the core sample: and determining the relative oil-water permeability of the medium-low pore-permeability reservoir to be detected according to the relationship between the oil phase permeability and the oil saturation and the relationship between the water phase permeability and the water saturation. The calculation precision of the oil-water relative permeability of the medium-low pore permeability reservoir is improved, and further technical support is provided for the exploration and development of low-saturation oil and gas reservoirs.
It should be apparent to those skilled in the art that embodiments of the present invention may be provided as a method, or computer program product. Accordingly, the present invention may take the form of an entirely software embodiment. 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 has been described with reference to flowchart illustrations and/or block diagrams of methods, 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-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (18)
1. A method for determining the relative oil-water permeability of a medium-low pore-permeability reservoir is characterized by comprising the following steps:
obtaining the oil phase permeability and the water phase permeability of the rock core sample of the medium-low pore permeability reservoir;
determining the steady-state oil-water relative permeability of the core sample according to the oil phase permeability and the water phase permeability of the core sample;
performing characteristic analysis on the steady-state oil-water relative permeability of the core sample to obtain the following components of the core sample: a relationship between oil phase permeability and oil saturation, a relationship between water phase permeability and water saturation;
according to the core sample: and determining the relative oil-water permeability of the medium-low pore-permeability reservoir to be detected according to the relationship between the oil phase permeability and the oil saturation and the relationship between the water phase permeability and the water saturation.
2. The method of claim 1, wherein obtaining the oil phase permeability and the water phase permeability of the medium-low porosity reservoir core sample comprises:
obtaining logging response characteristics of the medium-low porosity permeability reservoir core, wherein the logging response characteristics comprise: permeability and porosity;
selecting a core sample of the medium-low pore permeability reservoir according to the lithological description of the core of the medium-low pore permeability reservoir and the logging response characteristics;
and obtaining the oil phase permeability and the water phase permeability of the core sample measured based on the relative permeability and resistivity joint measurement experiment.
3. The method of claim 1, wherein the steady state oil water relative permeability of the core sample is characterized to obtain, for the core sample: a relationship between oil phase permeability and oil saturation, and a relationship between water phase permeability and water saturation, comprising:
performing characteristic analysis on the steady-state oil-water relative permeability of the core sample, and obtaining the following components of the core sample based on a binary logarithm linear regression method: the relationship between oil phase permeability and oil saturation, and the relationship between water phase permeability and water saturation.
4. The method of claim 1, wherein the core sample has: the relation between the oil phase permeability and the oil saturation and the relation between the water phase permeability and the water saturation are as follows:
oil phase permeability: log (K)ro/Kro(Swi))＝Ao(log(SoD))2+Bo log(SoD)；
Water phase permeability: log (K)rw/Krw(Sor))＝Aw(log(SwD))2+Bw log(SwD)；
Wherein: kroAs oil phase permeability, KrwAs water phase permeability, Kro(Swi) Oil phase permeability in a water-bound state; krw(Sor) Water phase permeability in the residual oil state, SwiFor rock irreducible water saturation, SorAs rock residual oil saturation, SoDTo normalize oil saturation, SwDTo normalize the water saturation, SoD＝1-SwD，Ao、Aw、Bo、BwIs an index of the pore structure of rock
The relevant coefficients, K is the permeability and φ is the porosity.
5. The method of claim 1, wherein, based on the core sample: determining the oil-water relative permeability of the medium-low pore permeability reservoir to be detected according to the relationship between the oil phase permeability and the oil saturation and the relationship between the water phase permeability and the water saturation, and the method comprises the following steps:
determining the pore structure index of the medium and low pore permeability reservoir to be detected according to the porosity and the permeability of the medium and low pore permeability reservoir to be detected;
determining the water saturation of the medium-low pore permeability reservoir to be detected according to the resistivity, the cementation index and the saturation index of the medium-low pore permeability reservoir to be detected;
according to the pore structure index and the water saturation of the medium-low pore-permeability reservoir to be detected and the core sample: and determining the relative oil-water permeability of the medium-low pore-permeability reservoir to be detected according to the relationship between the oil phase permeability and the oil saturation and the relationship between the water phase permeability and the water saturation.
6. The method of claim 1, further comprising:
and determining the water content of the medium-low pore permeability reservoir to be detected according to the relative oil-water permeability of the medium-low pore permeability reservoir to be detected.
7. The method of claim 6, wherein determining the water content of the to-be-tested mesopore and vugular permeability reservoir according to the relative oil-water permeability of the to-be-tested mesopore and vugular permeability reservoir comprises:
and determining the water content of the medium-low pore permeability reservoir to be detected according to the oil-water relative permeability, the oil viscosity and the water viscosity of the medium-low pore permeability reservoir to be detected.
8. The method of claim 7, wherein the water content of the to-be-tested mesopore and mesopore reservoir is determined according to the following formula:
in the formula: f. ofwThe water content of the medium and low pore permeability reservoir to be detected is determined; mu.swIs the oil viscosity mu of the reservoir with medium and low pore permeability to be measuredoThe water viscosity of the medium-low pore permeability reservoir to be detected is obtained; the oil-water relative permeability of the medium-low pore permeability reservoir to be detected comprises the following steps: measuring the oil phase permeability and the water phase permeability of the medium-low pore permeability reservoir, wherein K isroThe oil phase permeability K of the reservoir with medium and low pore permeability to be measuredrwThe water phase permeability of the medium and low pore permeability reservoir to be measured.
9. The utility model provides a device for confirming relative permeability of well hypotonic reservoir profit which characterized in that includes:
the data acquisition module is used for acquiring the oil phase permeability and the water phase permeability of the rock core sample of the medium-low pore permeability reservoir;
the steady-state oil-water relative permeability determining module is used for determining the steady-state oil-water relative permeability of the core sample according to the oil phase permeability and the water phase permeability of the core sample;
and the permeability relation determining module is used for performing characteristic analysis on the steady-state oil-water relative permeability of the core sample to obtain the following components of the core sample: a relationship between oil phase permeability and oil saturation, a relationship between water phase permeability and water saturation;
the oil-water relative permeability determining module is used for determining the relative permeability of the oil and water according to the core sample: and determining the relative oil-water permeability of the medium-low pore-permeability reservoir to be detected according to the relationship between the oil phase permeability and the oil saturation and the relationship between the water phase permeability and the water saturation.
10. The apparatus of claim 9, wherein the data acquisition module is specifically configured to:
obtaining logging response characteristics of the medium-low porosity permeability reservoir core, wherein the logging response characteristics comprise: permeability and porosity;
selecting a core sample of the medium-low pore permeability reservoir according to the lithological description of the core of the medium-low pore permeability reservoir and the logging response characteristics;
and obtaining the oil phase permeability and the water phase permeability of the core sample measured based on the relative permeability and resistivity joint measurement experiment.
11. The apparatus of claim 9, wherein the permeability relationship determination module is specifically configured to:
performing characteristic analysis on the steady-state oil-water relative permeability of the core sample, and obtaining the following components of the core sample based on a binary logarithm linear regression method: the relationship between oil phase permeability and oil saturation, and the relationship between water phase permeability and water saturation.
12. The apparatus of claim 9, wherein the core sample has: the relation between the oil phase permeability and the oil saturation and the relation between the water phase permeability and the water saturation are as follows:
oil phase permeability: log (K)ro/Kro(Swi))＝Ao(log(SoD))2+Bo log(SoD)；
Water phase permeability: log (K)rw/Krw(Sor))＝Aw(log(SwD))2+Bw log(SwD)；
Wherein: kroAs oil phase permeability, KrwAs water phase permeability, Kro(Swi) Oil phase permeability in a water-bound state; krw(Sor) Water phase permeability in the residual oil state, SwiFor rock irreducible water saturation, SorAs rock residual oil saturation, SoDTo normalize oil saturation, SwDTo normalize the water saturation, SoD＝1-SwD，Ao、Aw、Bo、BwIs an index of the pore structure of rock
The relevant coefficients, K is the permeability and φ is the porosity.
13. The apparatus of claim 9, wherein the relative oil-water permeability determination module is specifically configured to:
determining the pore structure index of the medium and low pore permeability reservoir to be detected according to the porosity and the permeability of the medium and low pore permeability reservoir to be detected;
determining the water saturation of the medium-low pore permeability reservoir to be detected according to the resistivity, the cementation index and the saturation index of the medium-low pore permeability reservoir to be detected;
according to the pore structure index and the water saturation of the medium-low pore-permeability reservoir to be detected and the core sample: and determining the relative oil-water permeability of the medium-low pore-permeability reservoir to be detected according to the relationship between the oil phase permeability and the oil saturation and the relationship between the water phase permeability and the water saturation.
14. The apparatus of claim 9, further comprising:
and the water content determination module is used for determining the water content of the medium-low pore permeability reservoir to be detected according to the relative oil-water permeability of the medium-low pore permeability reservoir to be detected.
15. The apparatus of claim 14, wherein the water cut determination module is specifically configured to:
and determining the water content of the medium-low pore permeability reservoir to be detected according to the oil-water relative permeability, the oil viscosity and the water viscosity of the medium-low pore permeability reservoir to be detected.
16. The apparatus of claim 15, wherein the moisture content determination module is further specifically configured to:
determining the water content of the medium-low pore permeability reservoir to be detected according to the following formula:
in the formula: f. ofwThe water content of the medium and low pore permeability reservoir to be detected is determined; mu.swIs the oil viscosity mu of the reservoir with medium and low pore permeability to be measuredoThe water viscosity of the medium-low pore permeability reservoir to be detected is obtained; the oil-water relative permeability of the medium-low pore permeability reservoir to be detected comprises the following steps: measuring the oil phase permeability and the water phase permeability of the medium-low pore permeability reservoir, wherein K isroThe oil phase permeability K of the reservoir with medium and low pore permeability to be measuredrwThe water phase permeability of the medium and low pore permeability reservoir to be measured.
17. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the method of any of claims 1 to 8 when executing the computer program.
18. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for executing the method of any one of claims 1 to 8.
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| CN116072232A (en) * | 2021-12-29 | 2023-05-05 | 中国石油天然气集团有限公司 | Method, device, equipment and storage medium for determining relative permeability curve |
| CN117664804A (en) * | 2024-02-01 | 2024-03-08 | 中国地质大学（北京） | Relative permeability curve correction method considering end face effect and application thereof |
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