CN111208049A - Method and device for evaluating tight sandstone imbibition effect - Google Patents
Method and device for evaluating tight sandstone imbibition effect Download PDFInfo
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Abstract
The invention provides a method and a device for evaluating the imbibition effect of tight sandstone, wherein the method comprises the following steps: measuring core parameter information; carrying out three-dimensional scanning on the compact sandstone core to obtain a core three-dimensional model; determining the porosity value and the porosity distribution curve of each scanning slice of the rock core along the axial direction of the rock core according to the three-dimensional model of the rock core; determining the porosity variation coefficient of the rock core according to the porosity value of each scanning slice of the rock core; determining the imbibition efficiency of the rock core through an imbibition experiment according to the parameter information of the rock core; and analyzing the relation between the imbibition efficiency and the three-dimensional model of the rock core, the axial distribution curve of the porosity along the rock core and the variation coefficient of the porosity. The method can evaluate the relationship between the tight rock core imbibition efficiency and the internal pore structure of the rock core from a microscale, and has more guiding significance for identifying tight sandstone imbibition rules and influencing factors.
Description
Technical Field
The invention relates to the field of oil and gas field development, in particular to a method and a device for evaluating the imbibition effect of tight sandstone.
Background
The development of compact oil is increasingly prominent in the world's energy structure. For low-permeability or compact sandstone oil reservoirs, imbibition and oil displacement are important mining mechanisms, and remarkable effects are achieved in development of oil field mines in recent years. Imbibition refers to the action of a wetting phase displacing a non-wetting phase in a porous medium under the force of a capillary. Currently, for evaluation and research of imbibition effect, the relationship between imbibition efficiency and macroscopic properties of rocks or fluids is mostly analyzed, for example, Raney et al (2019) research the relationship between imbibition oil production efficiency and parameters such as crude oil viscosity, injection water mineralization degree, temperature and permeability. However, the relationship between imbibition efficiency and rock micro-pore structure has been less studied. In the imbibition process, the capillary force plays a crucial role, and the high capillary pressure exists at the micro pore throat, so that water can enter the micro pores to expel and drive oil, and therefore, the evaluation of the imbibition effect of the tight sandstone on the micro pore scale is an important research direction. Person ya\38932et al (2019) analyzed the influence of pore structure characteristics on the imbibition oil displacement effect, but the research mainly emphasizes analysis of local characteristics of rocks by means of cast body slices, scanning electron microscopes and the like, so that uncertainty exists in the representativeness and reliability of experimental results.
Disclosure of Invention
The method is used for solving the defects of inaccuracy and incompleteness in the evaluation method of the imbibition effect of the compact sandstone in the prior art. In order to solve the above technical problems, a first aspect of the present invention provides a method for evaluating an imbibition effect of tight sandstone, comprising: measuring core parameter information;
carrying out three-dimensional scanning on the compact sandstone core to obtain a core three-dimensional model;
determining the porosity value and the porosity distribution curve of each scanning slice of the rock core along the axial direction of the rock core according to the three-dimensional model of the rock core;
determining the porosity variation coefficient of the rock core according to the porosity value of each scanning slice of the rock core;
determining the imbibition efficiency of the rock core through an imbibition experiment according to the parameter information of the rock core;
and analyzing the relation between the imbibition efficiency and the three-dimensional model of the rock core, the axial distribution curve of the porosity along the rock core and the variation coefficient of the porosity.
In a further embodiment, the core parameter information includes: mass, porosity, permeability, and pore volume.
In a further embodiment, determining the porosity value and the porosity distribution curve of each scanned slice of the core along the axial direction of the core according to the three-dimensional model of the core comprises:
obtaining the porosity value of each scanning slice of the rock core by using a data processing method according to the three-dimensional model of the rock core;
and obtaining a porosity distribution curve along the axial direction of the core according to the porosity value of each scanning slice of the core.
In a further embodiment, determining the porosity coefficient of variation of the core based on the porosity values of the core scan slices comprises calculating the porosity coefficient of variation using the following formula:
wherein phi is the porosity of each scan slice, unit%;
is the average value of the porosity of different scan slices, in%; and N is the number of core scanning slices.
In a further embodiment, determining the imbibition efficiency of the core through an imbibition experiment according to the core parameter information comprises:
soaking the core in distilled water, carrying out a spontaneous imbibition experiment, and calculating the imbibition amount according to the core mass and the core initial mass when the core mass change range is smaller than a preset value;
and calculating the imbibition efficiency of the rock core according to the imbibition amount by using the following formula:
r ═ imbibition ÷ (density of distilled water × pore volume of core).
The second aspect of the present invention provides a tight sandstone imbibition effect evaluation device, including: the parameter determining module is used for measuring the parameter information of the rock core;
the modeling module is used for carrying out three-dimensional scanning on the compact sandstone core to obtain a core three-dimensional model;
the porosity calculation module is used for determining the porosity value and the porosity distribution curve of each scanning slice of the rock core along the axial direction of the rock core according to the three-dimensional model of the rock core;
the porosity variation coefficient calculation module is used for determining the porosity variation coefficient of the rock core according to the porosity value of each scanning slice of the rock core;
the imbibition module is used for determining the imbibition efficiency of the rock core through an imbibition experiment according to the parameter information of the rock core;
and the analysis module is used for analyzing the relationship between the imbibition efficiency and the three-dimensional model of the rock core, the axial distribution curve of the porosity along the rock core and the variation coefficient of the porosity.
In a further embodiment, the core parameter information includes: mass, porosity, permeability, and pore volume.
In a further embodiment, the determining, by the porosity calculation module, the porosity value and the porosity distribution curve of each scan slice of the core along the axial direction of the core according to the three-dimensional model of the core includes:
obtaining the porosity value of each scanning slice of the rock core by using a data processing method according to the three-dimensional model of the rock core;
and obtaining a porosity distribution curve along the axial direction of the core according to the porosity value of each scanning slice of the core.
In a further embodiment, the porosity variation coefficient calculation module determines the porosity variation coefficient of the core according to the porosity value of each scanned slice of the core, and includes calculating the porosity variation coefficient by using the following formula:
wherein phi is the porosity of each scan slice, unit%;
is the average value of the porosity of different scan slices, in%; and N is the number of core scanning slices.
In a further embodiment, the imbibition module determines the imbibition efficiency of the core through an imbibition experiment according to the core parameter information, and the determining step includes:
soaking the core in distilled water, carrying out a spontaneous imbibition experiment, and calculating the imbibition amount according to the core mass and the core initial mass when the core mass change range is smaller than a preset value;
and calculating the imbibition efficiency of the rock core according to the imbibition amount by using the following formula:
r ═ imbibition ÷ (density of distilled water × pore volume of core).
A third aspect of the present invention provides a computer device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method for evaluating tight sandstone imbibition effect as described in any one of the preceding claims when executing the computer program.
A fourth aspect of the present invention provides a computer-readable storage medium storing a computer program for execution by a processor to implement the tight sandstone imbibition effect evaluation method of any of the preceding claims.
The invention provides a method and a device for evaluating the imbibition effect of tight sandstone, which are characterized in that the parameter information of a rock core is measured; carrying out three-dimensional scanning on the compact sandstone core to obtain a core three-dimensional model; determining the porosity value and the porosity distribution curve of each scanning slice of the rock core along the axial direction of the rock core according to the three-dimensional model of the rock core; determining the porosity variation coefficient of the rock core according to the porosity value of each scanning slice of the rock core; determining the imbibition efficiency of the rock core through an imbibition experiment according to the parameter information of the rock core; the relation between the imbibition efficiency and the three-dimensional model of the rock core, the relation between the porosity and the variation coefficient of the porosity along the axial distribution curve of the rock core can be evaluated from a microscale, and the method has more guiding significance for identifying the imbibition rule and the influencing factors of the tight sandstone.
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 in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be 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 shows a flow chart of a tight sandstone imbibition effect evaluation method according to an embodiment of the invention;
fig. 2 is a view showing the structure of a tight sandstone imbibition effect evaluation apparatus according to an embodiment of the present invention;
FIG. 3 shows a CT scan three-dimensional modeling diagram of core # 1 according to an embodiment of the invention;
FIG. 4 shows a CT scan three-dimensional modeling diagram of # 2 core according to an embodiment of the present invention;
FIG. 5 shows the porosity profile along the axial direction of the core for core # 1 of an example of the present invention;
fig. 6 shows the porosity profile along the axial direction of the core for # 2 core of an example 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, reference to the description of the terms "one embodiment," "a particular embodiment," "some embodiments," "for example," "an example," "a particular example," or "some examples," etc., means 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 view of the defects of inaccuracy and incompleteness of the evaluation method for the imbibition effect of the tight sandstone in the prior art, in an embodiment of the present invention, in order to solve the defects, an evaluation method for the imbibition effect of the tight sandstone is provided, as shown in fig. 1, including:
In detail, the core parameter information includes: mass, porosity, permeability, and pore volume. In specific implementation, the mass of the core is measured by an electronic balance, the porosity is measured by a porosity tester, the permeability is measured by a PDP-200 permeability tester, and the apparent size (including the diameter and the length of the core) of the core is measured by a vernier caliper to obtain the pore volume.
And 120, performing three-dimensional scanning on the compact sandstone core to obtain a core three-dimensional model.
In detail, CT scanning is utilized to realize three-dimensional scanning of the compact sandstone core, and a continuous scanning mode is adopted. And obtaining a rock core three-dimensional model based on CT three-dimensional scanning and by utilizing an image analysis technology.
In specific implementation, a GE Brivo CT385 type CT scanner is adopted to perform three-dimensional scanning on the compact sandstone core.
And step 130, determining the porosity value and the porosity distribution curve of each scanning slice of the rock core along the axial direction of the rock core according to the three-dimensional model of the rock core.
In specific implementation, step 130 includes: obtaining porosity values of different scanning slices of the rock core by using a data processing method according to the three-dimensional model of the rock core; and obtaining a porosity distribution curve along the axial direction of the rock core according to the porosity values of different scanning slices of the rock core. In detail, the axial direction of the core refers to the central axis direction of the length direction of the core, namely the scanning direction of a core scanning slice; and the porosity is distributed along the axial direction of the core by taking the serial number of the scanning slice as an abscissa, and the porosity value corresponding to each serial number of the scanning slice is an ordinate.
And 140, determining the porosity variation coefficient of the rock core according to the porosity value of each scanning slice of the rock core.
In detail, the porosity variation coefficient refers to a ratio of a standard deviation of the measured porosity of each scanned slice of a certain core to a porosity average value, and is a scalar quantity used for representing the strength of the porosity heterogeneity of each scanned slice along the axial direction of the core.
Determining the porosity variation coefficient of the core according to the axial pore distribution characteristics of the core, wherein the porosity variation coefficient is calculated by using the following formula:
wherein the content of the first and second substances,
the standard deviation of the porosity of each scanning section of the rock core is shown, and phi is the porosity of each scanning section and unit percent;
is the average value of the porosity of different scan slices, in%; n is core scanning and cuttingNumber of sheets.
And 150, determining the imbibition efficiency of the rock core through an imbibition experiment according to the parameter information of the rock core.
In detail, when the step 150 is specifically implemented, the core is soaked in distilled water to perform a spontaneous imbibition experiment, the mass of the core at different moments is measured by using an electronic balance in the imbibition process, when the change range of the mass of the core is smaller than a predetermined value (for example, 1%), imbibition is considered to be balanced, the difference between the mass of the core and the initial mass of the core at the moment is the imbibition amount, and then the imbibition efficiency R of the core is calculated by the following formula:
r ═ imbibition ÷ (density of distilled water × pore volume of core).
And 160, analyzing the relationship between the imbibition efficiency and the three-dimensional model of the rock core, the distribution curve of the porosity along the axial direction of the rock core and the variation coefficient of the porosity.
① the pore connectivity along the axial direction of the core can be obtained by using the three-dimensional model of the core, and the relation between the pore connectivity and the core imbibition efficiency is analyzed.
②, analyzing the size and the distribution uniformity of the porosity value by utilizing the porosity along the axial distribution curve of the core, wherein the porosity value of the core scanning slice is less than 5%, the core is considered to be mainly developed by a small pore and a medium pore, and the porosity value of the core scanning slice is more than 5%, the core is considered to be mainly developed by a large pore;
③ coefficient of variation of porosity σφThe smaller the pore size, the less heterogeneous the pore distribution. And then the relationship between the absorption efficiency and the absorption efficiency is analyzed.
Compared with the prior art, the invention has the following advantages:
the method is based on the CT scanning technology, and on the basis of analyzing the micro-pore distribution characteristics of the rock core, the relation between the tight rock core imbibition efficiency and the internal pore structure of the rock core is evaluated from a micro scale, so that the method has more guiding significance for identifying the tight sandstone imbibition rule and influencing factors.
Based on the same inventive concept, the embodiment of the invention also provides a tight sandstone imbibition effect evaluation device, which is described in the following embodiment. Because the principle of the device for solving the problems is similar to the tight sandstone imbibition effect evaluation method, the implementation of the device can refer to the implementation of the tight sandstone imbibition effect evaluation method, and repeated parts are not repeated.
Specifically, as shown in fig. 2, the tight sandstone imbibition effect evaluation device includes:
and the parameter determining module 210 is used for measuring the core parameter information. In detail, the core parameter information includes: mass, porosity, permeability, and pore volume.
The modeling module 220 is used for performing three-dimensional scanning on the tight sandstone core to obtain a core three-dimensional model;
the porosity calculation module 230 is used for determining the porosity value and the porosity distribution curve of each scanning slice of the rock core along the axial direction of the rock core according to the three-dimensional model of the rock core;
a porosity coefficient of variation calculation module 240, configured to determine a porosity coefficient of variation of the core according to a porosity value of each scanned slice of the core;
the imbibition module 250 is used for determining the imbibition efficiency of the rock core through an imbibition experiment according to the rock core parameter information;
and the analysis module 260 is used for analyzing the relationship between the imbibition efficiency and the three-dimensional model of the core, the axial distribution curve of the porosity along the core and the variation coefficient of the porosity.
In an embodiment of the present invention, the determining, by the porosity calculating module 230, the porosity value and the porosity distribution curve along the axial direction of the core of each scan slice of the core according to the three-dimensional model of the core includes:
obtaining the porosity value of each scanning slice of the rock core by using a data processing method according to the three-dimensional model of the rock core;
and obtaining a porosity distribution curve along the axial direction of the core according to the porosity value of each scanning slice of the core.
In an embodiment of the present invention, the porosity variation coefficient calculating module 240 determines the porosity variation coefficient of the core according to the porosity value of each scanned slice of the core, and includes calculating the porosity variation coefficient by using the following formula:
wherein phi is the porosity of each scan slice, unit%;
is the average value of the porosity of different scan slices, in%; and N is the number of core scanning slices.
In an embodiment of the present invention, the determining, by the imbibition experiment, the imbibition efficiency of the core by the imbibition module 250 according to the core parameter information includes:
soaking the core in distilled water, carrying out a spontaneous imbibition experiment, and calculating the imbibition amount according to the core mass and the core initial mass when the core mass change range is smaller than a preset value;
and calculating the imbibition efficiency of the rock core according to the imbibition amount by using the following formula:
r ═ imbibition ÷ (density of distilled water × pore volume of core).
In some embodiments of the present invention, there is further provided a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor executes the computer program to implement the method for evaluating tight sandstone imbibition effect as described in 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 evaluating tight sandstone imbibition effect according to any of the foregoing embodiments is implemented.
In order to more clearly illustrate the technical scheme of the invention, a specific embodiment is described in detail below, specifically, taking a certain oil reservoir as an example, two cores of different horizons and different wells are taken to perform related tests and analyses.
Step a, measuring parameter information of the two rock cores, wherein the measuring results are shown in the following table 1.
Table 1:
| core numbering | Diameter/cm | Length/cm | Core mass/g | Porosity/%) | Permeability/md | Pore volume/ml |
| 1# | 2.526 | 3.185 | 85.828 | 3.8316 | 0.0078206 | 0.611259962 |
| 2# | 2.532 | 3.133 | 49.6051 | 9.7264 | 0.0488824 | 1.533591103 |
And b, performing three-dimensional scanning on the compact sandstone core by adopting a GE Brivo CT385 type CT scanner to obtain a core three-dimensional model.
The main implementation parameters set for the CT scanner model GE Brivo CT385 are:
the scanning voltage is 120 kV;
scanning current 180 mA;
the resolution of the pixel point is 180 mu m.
After scanning, processing the experimental data by using software, performing three-dimensional modeling on the internal pore structure of the rock core, and obtaining a corresponding three-dimensional model image (as shown in fig. 3 and 4), so that the following results can be obtained:
① the gray area of the core No. 1 in FIG. 3 is the part with more developed pores, the transparent part is the skeleton of the rock, the darker the gray is, the smaller the CT value is, i.e. the area with concentrated pores.
② the gray area of the core 2# in fig. 4 is the part with more developed pores, the transparent part is the skeleton of the rock, the darker the gray is, the smaller the CT value is, i.e. the area with concentrated pores, the lighter color is the transition area.
And c, processing the data by software to obtain porosity values of different core scanning slices, wherein the 1# core obtains the porosity values of 160 scanning slices, and the 2# core obtains the porosity values of 160 scanning slices, and the porosity values are respectively drawn into a porosity distribution curve along the axial direction of the core (as shown in fig. 5 and 6). It can be seen that:
① 1 in the distribution curve of the core axial direction, the porosity of the core # 1 is distributed more evenly along the core axial direction, the difference between the wave crest and the wave trough is smaller, which indicates that the porosity of the core # 1 is better, in addition, the porosity value of each scanning slice of the core is less than 5%, which indicates that the core # 1 mainly develops medium and small pores.
② 2# core porosity along the axial distribution curve of the core, the curve is obviously saw-toothed, i.e. the valley point is a part of scanning slice with less pore distribution or interrupted pore communication, which indicates that the pore communication of the # 2 core is poor, in addition, the porosity value of each scanning slice of the core is generally more than 5%, which indicates that the # 2 core is mainly developed by macropores.
And d, calculating the porosity variation coefficients of the two rock cores. And (4) selecting the porosity values of 160 core scanning slices for the two cores to calculate the porosity variation coefficient. Calculating standard deviation and porosity average value of multiple scanning slices according to given formula to obtain variation coefficient sigmaφ：
Core # 1φ1＝0.03407；
Core # 2φ2＝0.23175；
σφ1<σφ2The heterogeneity of pore distribution was significantly stronger for the 2# core than for the 1# core.
And e, calculating the imbibition efficiency of the two rock cores.
And (3) carrying out a imbibition experiment, and measuring the dynamic change of the core quality in the imbibition experiment process, so that the final imbibition amount can be obtained, and the imbibition efficiency of the two cores can be obtained according to a formula, as shown in table 2.
Table 2:
| core numbering | Porosity/%) | Permeability/md | Pore volume/ml | Imbibition efficiency/%) |
| 1# | 3.8316 | 0.0078206 | 0.611259962 | 92.39931202 |
| 2# | 9.7264 | 0.0488824 | 1.533591103 | 62.46775937 |
And f, respectively analyzing the relationship between the imbibition efficiency of each core and the three-dimensional model, the distribution curve of the porosity along the axial direction of the core and the variation coefficient of the porosity of each core.
The porosity and permeability k of the 1# core are known to be low, and the imbibition efficiency of the core reaches about 92.4%, and the corresponding three experimental results are as follows:
① it can be known from the core three-dimensional model (fig. 3) that the pore distribution is relatively uniform and the connectivity is relatively good;
②, it is known from the axial distribution curve (fig. 5) of the porosity along the core that the variability of the core porosity distribution is small and the medium and small pore development is the main factor;
③, the calculated coefficient of variation is small (0.03407), and the corresponding pore distribution uniformity is good.
It is known that the porosity of the core 2# is high, the imbibition efficiency is only about 62.5%, and the result is lower compared with the result of the core 1# and the corresponding three experimental results are as follows:
①, obtaining the local development of the core pore from the core three-dimensional model (figure 4), and the connectivity is poor;
② it is known from the axial distribution curve of the porosity along the core (fig. 6) and the distribution of the core porosity with many pore connection interruptions, mainly the large pore development.
③, the coefficient of variation obtained by calculation is large (0.23175), and the pore distribution heterogeneity of the corresponding core is strong.
The analysis shows that the micro pore distribution characteristics of the rock core have great influence on the infiltration and absorption effect of the tight sandstone. When the rock core mainly develops medium and small holes, the pore distribution along the axial direction of the rock core is uniform, the porosity variation coefficient is small, and the connectivity is good, the tight sandstone imbibition efficiency is high. When the core is mainly developed by macropores, and the pore distribution heterogeneity along the axial direction of the core is strong, the porosity variation coefficient is large, and the connectivity is poor, the infiltration and absorption efficiency of the tight sandstone is low. The method and the device for evaluating the imbibition effect of the tight sandstone have more guiding significance for identifying the imbibition rule and the influencing factors of the tight sandstone.
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 (12)
1. A tight sandstone imbibition effect evaluation method is characterized by comprising the following steps:
measuring core parameter information;
carrying out three-dimensional scanning on the compact sandstone core to obtain a core three-dimensional model;
determining the porosity value and the porosity distribution curve of each scanning slice of the rock core along the axial direction of the rock core according to the three-dimensional model of the rock core;
determining the porosity variation coefficient of the rock core according to the porosity value of each scanning slice of the rock core;
determining the imbibition efficiency of the rock core through an imbibition experiment according to the parameter information of the rock core;
and analyzing the relation between the imbibition efficiency and the three-dimensional model of the rock core, the axial distribution curve of the porosity along the rock core and the variation coefficient of the porosity.
2. The method of claim 1, wherein the core parameter information comprises: mass, porosity, permeability, and pore volume.
3. The method of claim 1, wherein determining the porosity value and the porosity distribution curve along the axial direction of the core for each scan slice of the core based on the three-dimensional model of the core comprises:
obtaining the porosity value of each scanning slice of the rock core by using a data processing method according to the three-dimensional model of the rock core;
and obtaining a porosity distribution curve along the axial direction of the core according to the porosity value of each scanning slice of the core.
4. The method of claim 1, wherein determining the porosity coefficient of variation for the core based on the porosity values for each scan slice of the core comprises calculating the porosity coefficient of variation using the following equation:
wherein phi is the porosity of each scan slice, unit%;
is the average value of the porosity of different scan slices, in%; and N is the number of core scanning slices.
5. The method of claim 1, wherein determining the imbibition efficiency of the core by an imbibition experiment based on the core parameter information comprises:
soaking the core in distilled water, carrying out a spontaneous imbibition experiment, and calculating the imbibition amount according to the core mass and the core initial mass when the core mass change range is smaller than a preset value;
and calculating the imbibition efficiency of the rock core according to the imbibition amount by using the following formula:
r ═ imbibition ÷ (density of distilled water × pore volume of core).
6. The utility model provides a tight sandstone imbibition effect evaluation device which characterized in that includes:
the parameter determining module is used for measuring the parameter information of the rock core;
the modeling module is used for carrying out three-dimensional scanning on the compact sandstone core to obtain a core three-dimensional model;
the porosity calculation module is used for determining the porosity value and the porosity distribution curve of each scanning slice of the rock core along the axial direction of the rock core according to the three-dimensional model of the rock core;
the porosity variation coefficient calculation module is used for determining the porosity variation coefficient of the rock core according to the porosity value of each scanning slice of the rock core;
the imbibition module is used for determining the imbibition efficiency of the rock core through an imbibition experiment according to the parameter information of the rock core;
and the analysis module is used for analyzing the relationship between the imbibition efficiency and the three-dimensional model of the rock core, the axial distribution curve of the porosity along the rock core and the variation coefficient of the porosity.
7. The apparatus of claim 6, wherein the core parameter information comprises: mass, porosity, permeability, and pore volume.
8. The apparatus of claim 6, wherein the porosity calculation module determines the porosity value and the porosity distribution curve along the axial direction of the core for each scan slice of the core according to the three-dimensional model of the core, and comprises:
obtaining the porosity value of each scanning slice of the rock core by using a data processing method according to the three-dimensional model of the rock core;
and obtaining a porosity distribution curve along the axial direction of the core according to the porosity value of each scanning slice of the core.
9. The apparatus of claim 6, wherein the porosity coefficient of variation calculation module determines the porosity coefficient of variation of the core based on the porosity values of the core for each scan slice, comprising calculating the porosity coefficient of variation using the following equation:
where φ is the porosity of each scan sliceIn units%;
is the average value of the porosity of different scan slices, in%; and N is the number of core scanning slices.
10. The apparatus as claimed in claim 6, wherein the imbibition module determines the imbibition efficiency of the core through an imbibition experiment according to the core parameter information, comprising:
soaking the core in distilled water, carrying out a spontaneous imbibition experiment, and calculating the imbibition amount according to the core mass and the core initial mass when the core mass change range is smaller than a preset value;
and calculating the imbibition efficiency of the rock core according to the imbibition amount by using the following formula:
r ═ imbibition ÷ (density of distilled water × pore volume of core).
11. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method for evaluating tight sandstone imbibition effect of any of claims 1-5 when executing the computer program.
12. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for execution, which when executed by a processor, implements the tight sandstone imbibition effect evaluation method of any one of claims 1 to 5.
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