Water flooding sweep degree evaluation method and device based on longitudinal reservoir heterogeneity

Abstract

The invention discloses a water flooding sweep degree evaluation method and equipment based on longitudinal reservoir heterogeneity. The method comprises the following steps: determining heterogeneity geological parameters of a reservoir to be evaluated according to a development layer series design scheme of the reservoir to be evaluated; and determining the water flooding sweep degree of the reservoir to be evaluated according to the heterogeneity geological parameters of the reservoir to be evaluated and a pre-established comprehensive relationship expression between the heterogeneity geological parameters and the water flooding sweep degree. An establishment process of comprehensive relationship expression: selecting multiple groups of different heterogeneity geological parameters of the reference development layer series, and correspondingly establishing multiple geological models with different heterogeneity degrees of the reference development layer series; the selected oil and gas reservoir analysis method is adopted, and the water flooding sweep degree corresponding to the multiple geological models is determined; and according to the water flooding sweep degrees corresponding to the plurality of geological models, establishing a comprehensive relationship expression between the heterogeneous geological parameters and the water flooding sweep degrees. According to the method, the water flooding sweep degree can be accurately evaluated, and the actual requirement of a project is met.

Description

Technical Field

[0001] This invention relates to the field of enhanced oil recovery technology in petroleum development, and particularly to a method and apparatus for evaluating the degree of water drive sweep efficiency based on the heterogeneity of vertical reservoirs. Background Technology

[0002] Oilfield development is a process of continuously characterizing and overcoming reservoir heterogeneity. Actual oilfield development experience shows that the stronger the reservoir heterogeneity, the worse the waterflooding effect. The fundamental reason is that the reservoir heterogeneity determines the degree of waterflooding utilization; the stronger the reservoir heterogeneity, the smaller the waterflooding sweep volume, and the worse the development effect. In reservoirs dominated by continental sedimentary deposits, where fluvial and deltaic facies sediments predominate, strong heterogeneity is present. Waterflooding in such reservoirs is ineffective, making it difficult to establish effective displacement. During the medium to high water-cut period, waterflooding breakthroughs are rapid, but production declines are significant. For reservoirs entering the later stages of development, optimizing well pattern design and development layer division to establish effective displacement and deeply tap the remaining oil potential of older oilfields will be a crucial direction for increasing and stabilizing oil production. The degree of waterflooding utilization in an oilfield is an important basis for well pattern design and development layer division in reservoir development. Currently, the degree of waterflooding utilization is mostly determined statistically based on the water intake profile of injection wells and the production profile of production wells.

[0003] In order to optimize well pattern design and development layer division, industry scholars have conducted some experiments and studies on the water drive efficiency. For example: (1) In the 2009 master's thesis of China University of Petroleum (East China) entitled "Study on Water Drive Efficiency and Sweep Law of Medium-High Permeability Sandstone Reservoirs", a two-dimensional physical model was established for medium-high permeability reservoirs, and the sweep law of water drive under step-by-step fluid lifting was studied. (2) In the article entitled "Indoor Experimental Study on Water Drive Sweep Coefficient of Large Planar Model with Interlayer Heterogeneity" published in Petroleum Experimental Geology, 2013, 35(6), the influence of interlayer heterogeneity on the changes in oil saturation and sweep rate under different displacement pressure differentials was proposed. (3) In the article entitled "Evaluation of Residual Oil Distribution in Water Drive Based on Nuclear Magnetic Resonance Technology" published in Laboratory Research and Exploration, 2017, 36(9), conventional water drive experiments on displacement ratio and rate of medium-permeability loose sandstone were published. (4) In the article titled “Quantitative Characterization of Water Drive Sweep Coefficient of Horizontal Wells in Marine Bottom Water Reservoirs” published in the 2020, 32(6) issue of Lithological Oil and Gas Reservoirs, a fine numerical model of bottom water reservoirs was established based on the one-dimensional long core water drive experiment of Bohai heavy oil, and the variation law of water drive sweep rate and horizontal well water drive efficiency after water drive and the variation law of water drive sweep rate between horizontal wells was simulated. Summary of the Invention

[0004] Existing experiments and studies on the extent of water-driven flooding, whether through modeling or laboratory experiments, are primarily qualitative studies of the influence of different factors on the degree of water-driven flooding. They lack quantitative characterization and therefore cannot provide accurate and effective data support for reservoir development, offering limited guidance for increasing reservoir production. Furthermore, there is a lack of research on the relationship between reservoir heterogeneity, which plays a decisive role in the extent of water-driven flooding, and the degree of water-driven flooding. This prevents a quantitative characterization of the relationship between the two and the development stratigraphic sequence and the vertical heterogeneity of the reservoir. In other words, there is a theoretical gap in the current technology for quantitatively characterizing the extent of water-driven flooding in reservoirs through reservoir heterogeneity, and a lack of research methods and tools.

[0005] Since reservoir heterogeneity can be quantitatively described by parameters such as permeability variation coefficient, surge coefficient, and homogeneity coefficient, the inventors of this application have studied the relationship between geological parameters of vertical reservoir heterogeneity and the degree of water-driven utilization. They found that, based on the mechanism by which reservoir heterogeneity affects the degree of water-driven utilization in oil reservoirs, a theoretical chart of the relationship between reservoir heterogeneity and the degree of water-driven utilization can be established, realizing a quantitative expression of the relationship between the two. This quantitatively characterizes the degree of water-driven utilization in oil reservoirs, thereby providing more accurate data support for optimizing well pattern design and development layer division, and improving oil reservoir production.

[0006] In view of the above problems, the present invention is proposed to provide a method and apparatus for evaluating the water drive sweep rate based on the vertical reservoir heterogeneity in order to overcome or at least partially solve the above problems.

[0007] This invention provides a method for evaluating the water drive sweep rate based on vertical reservoir heterogeneity, comprising:

[0008] Based on the development stratigraphic design scheme of the reservoir to be evaluated, the heterogeneous geological parameters of the reservoir to be evaluated are determined; the heterogeneous geological parameters include permeability gradient, coefficient of variation, and burst coefficient;

[0009] The water drive sweep extent of the reservoir to be evaluated is determined based on the heterogeneous geological parameters of the reservoir to be evaluated and the pre-established comprehensive relationship between the heterogeneous geological parameters and the water drive sweep extent.

[0010] The process of establishing the comprehensive relation expression includes:

[0011] Multiple sets of different heterogeneous geological parameters of the reference development strata are selected, and corresponding geological models of different degrees of heterogeneity of the reference development strata are established.

[0012] The selected hydrocarbon reservoir analysis methods were used to determine the water drive sweep extent for each of the geological models.

[0013] Based on the water drive sweep extent corresponding to multiple geological models, a comprehensive relationship expression between heterogeneous geological parameters and water drive sweep extent is established.

[0014] A further optional implementation involves determining the heterogeneity geological parameters of the reservoir to be evaluated based on the development stratigraphic design scheme, including:

[0015] Based on the number of development layers and permeability data of each layer in the development layer design scheme of the reservoir to be evaluated, the permeability gradient, coefficient of variation, and breakthrough coefficient of the development layer system are determined.

[0016] A further optional implementation method is to select multiple sets of different heterogeneous geological parameters of the reference development strata and establish multiple geological models of different degrees of heterogeneity of the development strata accordingly.

[0017] Within the preset range of heterogeneous geological parameters, select multiple sets of heterogeneous geological parameters of the reference development strata;

[0018] For each set of heterogeneous geological parameters, based on the heterogeneous geological parameters and the preset average permeability, the permeability data of each layer in the reference development system is determined, and a geological model of the development system is established based on the permeability data.

[0019] In a further optional implementation, the permeability gradient ranges from 1 to 10,000, the coefficient of variation ranges from 0 to 1.76, and the breakthrough coefficient ranges from 1.0 to 4.5.

[0020] A further optional implementation involves establishing a comprehensive relationship between heterogeneous geological parameters and water drive sweep radii based on the water drive sweep radii corresponding to multiple geological models, including:

[0021] Based on the water drive sweep extent corresponding to multiple geological models, unidirectional relationships between permeability gradient and water drive sweep extent, unidirectional relationships between coefficient of variation and water drive sweep extent, and unidirectional relationships between advance coefficient and water drive sweep extent are established respectively.

[0022] By using optimal mathematical algorithms to process the one-way relationship between water drive sweepability, the one-way relationship between coefficient of variation and water drive sweepability, and the one-way relationship between surge coefficient and water drive sweepability, a comprehensive relationship expression between permeability gradient, coefficient of variation, surge coefficient and water drive sweepability is established.

[0023] Further optional implementation methods,

[0024] The unidirectional relationship between permeability gradients and water drive sweepability is expressed as follows:

[0025] y = x -0.117 ;

[0026] Where y represents the water drive sweep rate and x represents the permeability difference;

[0027] The unidirectional relationship between the coefficient of variation and the extent of water drive sweep is expressed as follows:

[0028] y = -0.1195x 2 -0.1641x+1.0;

[0029] Where y represents the water drive sweep extent and x represents the coefficient of variation;

[0030] The unidirectional relationship between the surge coefficient and the water drive sweep rate is expressed as follows:

[0031] y = -0.0206x 2 -0.0731x+1.0937;

[0032] Where y is the water drive sweep rate and x is the surge coefficient;

[0033] The comprehensive relationship between permeability gradient, coefficient of variation, surge coefficient, and water drive sweepability is expressed by the following formula:

[0034]

[0035] Among them, E w J represents the extent of water drive impact. k V represents the permeability gradient. k T is the coefficient of variation. k This is the surge coefficient.

[0036] A further optional implementation, after establishing a comprehensive expression of the relationship between heterogeneous geological parameters and water drive sweep radii based on the water drive sweep radii corresponding to multiple geological models, further includes:

[0037] Within the preset range of oil-water viscosity ratio, different oil-water viscosity ratios are taken as the oil-water viscosity ratios of each geological model with different degrees of heterogeneity. Using the selected oil and gas reservoir analysis method, the water drive sweep degree corresponding to the multiple geological models with different degrees of heterogeneity under different oil-water viscosity ratios is determined.

[0038] Based on the water drive sweep extent corresponding to different oil-water viscosity ratios under multiple geological models with different degrees of heterogeneity, a one-way relationship between oil-water viscosity ratio and water drive sweep extent is established.

[0039] By utilizing the optimal algorithm to process the unidirectional relationship between oil-water viscosity ratio and water drive sweepability, as well as the comprehensive relationship between heterogeneous geological parameters and water drive sweepability, a theoretical relationship expression for water drive sweepability coefficient is established.

[0040] In a further optional embodiment, the oil-water viscosity ratio ranges from 1 to 50.

[0041] Further optional implementation methods,

[0042] The unidirectional relationship between the oil-water viscosity ratio and the water drive sweepability is expressed as follows, with different specified permeability gradients:

[0043] y=-0.126ln(x)+0.9971, y=-0.122ln(x)+0.8454, y=-0.11ln(x)+0.631;

[0044] Where y is the water drive sweep rate and x is the oil-water viscosity ratio;

[0045] The theoretical relationship of the water drive sweep efficiency is expressed by the following formula:

[0046] E w =0.6979+0.3333J k -0.117 -0.0398V k 2 -0.0069T k 2 -0.0547V k -0.0244T k -0.12lnU OW ;

[0047] Among them, E w J represents the extent of water drive impact. k V represents the permeability gradient. k T is the coefficient of variation. k U is the surge coefficient. OW This refers to the oil-water viscosity ratio.

[0048] A further optional implementation, after establishing the theoretical relationship expression for the water drive sweep efficiency, also includes:

[0049] Based on the development stratigraphic design scheme of the reservoir to be evaluated, determine the heterogeneous geological parameters and oil-water viscosity ratio of the reservoir to be evaluated;

[0050] The degree of water drive sweep efficiency of the reservoir under evaluation is determined based on the theoretical relationship between the heterogeneous geological parameters, oil-water viscosity ratio, and water drive sweep efficiency of the reservoir under evaluation.

[0051] This invention provides a waterflood sweep efficiency evaluation device based on vertical reservoir heterogeneity, characterized in that it includes:

[0052] The parameter acquisition module is used to determine the heterogeneous geological parameters of the reservoir to be evaluated based on the development stratigraphic design scheme of the reservoir to be evaluated; the heterogeneous geological parameters include permeability gradient, coefficient of variation and surge coefficient;

[0053] The evaluation module is used to determine the water drive sweep rate of the reservoir to be evaluated based on the heterogeneous geological parameters of the reservoir to be evaluated and the pre-established comprehensive relationship between the heterogeneous geological parameters and the water drive sweep rate.

[0054] A pre-built module is used to select multiple sets of different heterogeneous geological parameters of the reference development strata and establish multiple geological models with different degrees of heterogeneity of the reference development strata accordingly. The selected oil and gas reservoir analysis method is used to determine the water drive sweep degree corresponding to the multiple geological models. Based on the water drive sweep degree corresponding to the multiple geological models, a comprehensive relationship expression between the heterogeneous geological parameters and the water drive sweep degree is established.

[0055] This invention provides a computer storage medium storing computer-executable instructions. When these computer-executable instructions are executed by a processor, they implement the water drive sweep efficiency evaluation method based on vertical reservoir heterogeneity as described above.

[0056] This invention provides a water drive sweepability assessment device based on vertical reservoir heterogeneity, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the water drive sweepability assessment method based on vertical reservoir heterogeneity as described above.

[0057] The beneficial effects of the above-described technical solutions provided in the embodiments of the present invention include at least the following:

[0058] This invention selects multiple sets of different heterogeneous geological parameters of the reference development strata and establishes corresponding geological models with different degrees of heterogeneity for the reference development strata, providing multiple geological models with different degrees of heterogeneity for subsequent research. Using selected reservoir analysis methods, the water drive sweep radii corresponding to the multiple geological models are determined, providing different heterogeneous geological parameters and corresponding water drive sweep radii for subsequent research. Based on the water drive sweep radii corresponding to the multiple geological models, a comprehensive relationship expression between heterogeneous geological parameters and water drive sweep radii is established. Through rigorous mathematical calculations using discrete numerical heterogeneous geological parameters and their corresponding water drive sweep radii, an accurate relationship expression between heterogeneous geological parameters and water drive sweep radii is obtained. By using the accurate relationship expression between heterogeneous geological parameters and water drive sweep radii for the reservoir to be evaluated, an accurate water drive sweep radii for the reservoir to be evaluated is obtained, meeting the actual needs of the project.

[0059] Furthermore, within a preset range for the oil-water viscosity ratio, different oil-water viscosity ratios were selected as the oil-water viscosity ratios for each geological model with varying degrees of heterogeneity. Using chosen reservoir analysis methods, the water drive sweep efficiency corresponding to different oil-water viscosity ratios for multiple geological models with varying degrees of heterogeneity was determined. This provides different oil-water viscosity ratios and their corresponding values, offering data support for subsequent research. Based on the water drive sweep efficiency corresponding to different oil-water viscosity ratios for multiple geological models with varying degrees of heterogeneity, a one-way relationship between the oil-water viscosity ratio and the water drive sweep efficiency was established. Using an optimal algorithm, the one-way relationship between the oil-water viscosity ratio and the water drive sweep efficiency, as well as the comprehensive relationship between heterogeneous geological parameters and the water drive sweep efficiency, were processed to establish a theoretical relationship for the water drive sweep efficiency coefficient. Based on the development stratigraphic design scheme of the reservoir to be evaluated, the heterogeneous geological parameters and oil-water viscosity ratio of the reservoir to be evaluated were determined. Based on the theoretical relationship between the heterogeneous geological parameters, oil-water viscosity ratio, and water drive sweep efficiency coefficient of the reservoir to be evaluated, the accurate water drive sweep efficiency of the reservoir to be evaluated was obtained.

[0060] Furthermore, the water drive sweep extent predicted by this invention guides the re-division of existing oil extraction schemes. The water drive sweep extent of the re-divisiond extraction schemes meets the extraction requirements, thereby increasing the amount of oil and gas extracted.

[0061] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings.

[0062] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0063] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0064] Figure 1 This is a flowchart illustrating the establishment of the comprehensive relationship expression in Embodiment 1 of the present invention;

[0065] Figure 2 This is a flowchart of the water drive sweep effect evaluation process in Embodiment 1 of the present invention;

[0066] Figure 3 This is a flowchart illustrating the establishment of the comprehensive relationship expression in Embodiment 2 of the present invention;

[0067] Figure 4 This is a flowchart illustrating the water drive sweep extent evaluation in Embodiment 2 of the present invention.

[0068] Figure 5 This is a schematic diagram of heterogeneous geological parameters in Embodiment 2 of the present invention;

[0069] Figure 6 This is an example diagram of heterogeneous geological parameters and water drive sweep extent in Embodiment 2 of the present invention;

[0070] Figure 7 This is an example diagram illustrating the correlation between permeability gradient and water drive sweep extent in Embodiment 2 of the present invention;

[0071] Figure 8 This is an example diagram illustrating the correlation between the coefficient of variation and the degree of water drive sweep in Embodiment 2 of the present invention;

[0072] Figure 9 This is an example diagram illustrating the correlation between the surge coefficient and the water drive sweep rate in Embodiment 2 of the present invention;

[0073] Figure 10 This is a schematic diagram of the oil-water viscosity ratio and water drive sweep efficiency parameters in Embodiment 2 of the present invention;

[0074] Figure 11 This is a schematic diagram illustrating the correlation between the oil-water viscosity ratio and the degree of water-driven sweep efficiency in Embodiment 2 of the present invention.

[0075] Figure 12 This is a schematic diagram of the water drive sweep rate evaluation device based on vertical reservoir heterogeneity in an embodiment of the present invention. Detailed Implementation

[0076] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0077] To address the problems existing in the prior art, embodiments of the present invention provide a method and apparatus for evaluating the water drive sweep rate based on the vertical reservoir heterogeneity.

[0078] Example 1

[0079] Embodiment 1 of the present invention provides a method for evaluating the water drive sweepability based on the vertical reservoir heterogeneity. The process includes a process for establishing a comprehensive relational expression and a process for evaluating the water drive sweepability. The process for establishing the comprehensive relational expression is as follows: Figure 1 As shown, the water drive sweep impact assessment process is as follows: Figure 2 As shown.

[0080] The process of establishing a comprehensive relational expression includes the following steps:

[0081] Step S101: Select multiple sets of different heterogeneous geological parameters of the reference development strata, and establish multiple geological models of different degrees of heterogeneity of the reference development strata accordingly.

[0082] In this embodiment, a range of heterogeneous geological parameters is determined, and within this range, multiple sets of heterogeneous geological parameters are selected for the reference development strata. For each set of heterogeneous geological parameters, based on the heterogeneous geological parameters and a preset average permeability, permeability data for each layer in the reference development strata is determined, and a geological model of the development strata is established based on this permeability data.

[0083] Step S102: Using the selected oil and gas reservoir analysis method, determine the water drive sweep extent corresponding to multiple geological models respectively.

[0084] In this embodiment, reservoir analysis methods are used to determine the water drive sweep rate corresponding to multiple geological models. For example, reservoir numerical simulation is preferably used to determine the water drive sweep rate corresponding to multiple geological models. Alternatively, methods such as the water drive characteristic curve method and the decreasing curve method can also be used to determine the water drive sweep rate corresponding to multiple geological models.

[0085] Step S103: Based on the water drive sweep extent corresponding to multiple geological models, establish a comprehensive relationship expression between heterogeneous geological parameters and water drive sweep extent.

[0086] In this embodiment, based on the water drive sweepability corresponding to multiple obtained geological models, one-way relationships are established between permeability gradient and water drive sweepability, coefficient of variation and water drive sweepability, and advance coefficient and water drive sweepability. An optimal mathematical algorithm is used to process these one-way relationships, establishing a comprehensive relationship expression between permeability gradient, coefficient of variation, advance coefficient, and water drive sweepability. For example, the optimal mathematical algorithm uses the least squares method; however, other specific algorithms can also be used.

[0087] The process for assessing the extent of water-driven impact includes the following steps:

[0088] Step S111: Based on the development stratigraphic design scheme of the reservoir to be evaluated, determine the heterogeneous geological parameters of the reservoir to be evaluated; the heterogeneous geological parameters include permeability gradient, coefficient of variation and outburst coefficient.

[0089] In this embodiment, the reservoir to be evaluated is determined, and based on the number of development layers and permeability data of each layer in the development layer design scheme of the reservoir to be evaluated, the permeability difference, coefficient of variation and breakthrough coefficient of the development layer system are determined.

[0090] Step S112: Determine the water drive sweep rate of the reservoir to be evaluated based on the heterogeneous geological parameters of the reservoir to be evaluated and the pre-established comprehensive relationship between the heterogeneous geological parameters and the water drive sweep rate.

[0091] In this embodiment, the heterogeneous geological parameters of the reservoir to be evaluated are processed using a pre-established comprehensive relationship between heterogeneous geological parameters and water drive sweep rate, thereby obtaining the water drive sweep rate of the reservoir to be evaluated.

[0092] In this embodiment, multiple sets of different heterogeneous geological parameters of the reference development strata are selected, and corresponding geological models with different degrees of heterogeneity are established for the reference development strata, providing multiple geological models with different degrees of heterogeneity for subsequent research. Using the selected reservoir analysis method, the water drive sweep radii corresponding to the multiple geological models are determined, providing different heterogeneous geological parameters and corresponding water drive sweep radii for subsequent research. Based on the water drive sweep radii corresponding to the multiple geological models, a comprehensive relationship expression between heterogeneous geological parameters and water drive sweep radii is established. Through rigorous mathematical calculations, an accurate relationship expression between heterogeneous geological parameters and water drive sweep radii is obtained from the discrete numerical heterogeneous geological parameters and their corresponding water drive sweep radii. Using the accurate relationship expression between heterogeneous geological parameters and water drive sweep radii for the reservoir to be evaluated, an accurate water drive sweep radii for the reservoir to be evaluated is obtained, meeting the actual needs of the project.

[0093] Embodiment 2 of the present invention provides a method for evaluating the water drive sweepability based on the vertical reservoir heterogeneity. The specific process includes a detailed process for establishing a comprehensive relational expression and a detailed process for evaluating the water drive sweepability. The detailed process for establishing the comprehensive relational expression is as follows: Figure 3 As shown, the specific process for evaluating the extent of water drive sweep hazard is as follows: Figure 4 As shown.

[0094] The specific process for establishing a comprehensive relation expression includes the following steps:

[0095] Step S201: Within the preset range of heterogeneous geological parameters, select multiple sets of heterogeneous geological parameters for the reference development strata.

[0096] In this embodiment, a range of heterogeneous geological parameters is determined, and within this range, multiple sets of heterogeneous geological parameters of the reference development strata are selected. The range and number of sets of heterogeneous geological parameters can be determined as needed. Specifically, the range of permeability gradients is, for example, but not limited to, 1 to 10000; the range of the coefficient of variation is, for example, but not limited to, 0 to 1.76; and the range of the bursting coefficient is, for example, but not limited to, 1.0 to 4.5.

[0097] Step S202: For each set of heterogeneous geological parameters, determine the permeability data of each layer in the reference development system based on the heterogeneous geological parameters and the preset average permeability, and establish a geological model of the development system based on the permeability data.

[0098] In this embodiment, for example, Figure 5 The diagram shows 23 sets of heterogeneous geological parameters from left to right. Each set contains 5 small reservoir permeabilities, with an average permeability of 10 for each set. Based on these 23 sets of heterogeneous geological parameters, 23 geological models representing different degrees of heterogeneity are established. The first, second, third, fourth, and fifth small reservoirs in each heterogeneous geological model correspond to... Figure 5 In the model, 1, 2, 3, 4, and 5 represent reservoirs with a thickness of 5 meters. The average reservoir permeability of the 23 heterogeneous geological models is 10. For the first heterogeneous geological model, the permeability of the first, second, third, fourth, and fifth sub-reservoirs is 10, with a permeability increment of 1, a coefficient of variation of 0, and a surge coefficient of 1. This pattern continues for the second, third, and so on. In this embodiment, 10, 20, 30, or other numbers of heterogeneous geological models can be established. The average permeability of each model can be 5, 15, 20, or other values. The heterogeneous geological parameter set can also be... Figure 5 Other parameter groups besides those.

[0099] Step S203: Using the selected oil and gas reservoir analysis method, determine the water drive sweep rate corresponding to multiple geological models respectively.

[0100] In this embodiment, for example, reservoir numerical simulation is used to calculate the water drive sweep rate corresponding to 23 geological models with varying degrees of heterogeneity, such as... Figure 6 As shown, the permeability gradient of the first heterogeneous geological model from left to right is 1, the coefficient of variation is 0, and the surge coefficient is 1. The water drive sweep rate is 100%. Similarly, the water drive sweep rate of the second heterogeneous geological model is 95.3%...

[0101] Step S203: Based on the water drive sweep extent corresponding to multiple geological models, establish unidirectional relationships between permeability gradient and water drive sweep extent, unidirectional relationships between coefficient of variation and water drive sweep extent, and unidirectional relationships between advance coefficient and water drive sweep extent.

[0102] In this embodiment, for example, according to Figure 6 Based on the data of permeability gradients and water drive sweep extent, establish as follows Figure 7The curves showing the permeability gradient and water drive sweep power, and the unidirectional relationship between permeability gradient and water drive sweep power, are illustrated. Figure 7 The horizontal axis represents the permeability gradient, and the vertical axis represents the water drive sweep rate. The unidirectional relationship between the permeability gradient and the water drive sweep rate is expressed by the formula y = x -0.117 y represents the water drive sweep extent, and x represents the permeability gradient. From Figure 7 It can be seen that when the permeability difference is less than 100, the water drive sweep power decreases rapidly with the increase of the permeability difference, where R 2 This indicates the precision of the curve; the closer it is to 1, the higher the precision.

[0103] In this embodiment, for example, according to Figure 6 Based on the heterogeneity coefficient and water drive sweep extent data, establish as follows Figure 8 The curves showing the coefficient of variation and water drive sweep efficiency, and the unidirectional relationship between the coefficient of variation and water drive sweep efficiency, are illustrated. Figure 8 The horizontal axis represents the coefficient of variation, and the vertical axis represents the extent of water drive sweep. The unidirectional relationship between the coefficient of variation and the extent of water drive sweep is expressed by the formula: y = -0.1195x 2 -0.1641x+1.0, where y is the water drive sweep extent and x is the coefficient of variation. From Figure 8 It can be seen that the larger the coefficient of variation, the smaller the water drive sweep rate. When the coefficient of variation is greater than 1.3, the water drive sweep rate is less than 60%. Among them, R... 2 This indicates the precision of the curve; the closer it is to 1, the higher the precision.

[0104] In this embodiment, according to Figure 6 Based on the heterogeneity coefficient and water drive sweep extent data, establish as follows Figure 9 The curves showing the advance coefficient and water drive sweep efficiency, and the unidirectional relationship between the advance coefficient and water drive sweep efficiency, are illustrated. Figure 9 The horizontal axis represents the surge coefficient, and the vertical axis represents the water drive sweep rate. The unidirectional relationship between the surge coefficient and the water drive sweep rate is expressed by the formula: y = -0.0206x 2 -0.0731x+1.0937, where y is the water drive sweep rate and x is the surge coefficient, where R 2 This indicates the precision of the curve; the closer it is to 1, the higher the precision.

[0105] according to Figure 6 , Figure 7 , Figure 8 , Figure 9 As can be seen, to achieve a water drive reach of over 80%, the reservoir permeability difference should be less than 10, the coefficient of variation should be less than 0.8, and the breakthrough coefficient should be less than 2.5; while to achieve a water drive reach of over 60%, the reservoir permeability difference should be less than 100, the coefficient of variation should be less than 1.3, and the breakthrough coefficient should be less than 3.5.

[0106] Step S204: Using the optimal mathematical algorithm, process the one-way relationship expression of water drive sweepability, the one-way relationship expression of coefficient of variation and water drive sweepability, and the one-way relationship expression of advance coefficient and water drive sweepability to establish a comprehensive relationship expression of permeability difference, coefficient of variation, advance coefficient and water drive sweepability.

[0107] In this embodiment, for example, the least squares method is used to process the one-way relationships between water drive sweepability, coefficient of variation and water drive sweepability, and surge coefficient and water drive sweepability, establishing a comprehensive relationship expression between permeability gradient, coefficient of variation, surge coefficient and water drive sweepability. The formula for the comprehensive relationship expression between permeability gradient, coefficient of variation, surge coefficient and water drive sweepability is as follows: E w J represents the extent of water drive impact. k V represents the permeability gradient. k T is the coefficient of variation. k This is the surge coefficient.

[0108] Step S205: Within the preset range of oil-water viscosity ratio, take different oil-water viscosity ratios as the oil-water viscosity ratios for each geological model with different degrees of heterogeneity, and use the selected oil and gas reservoir analysis method to determine the water drive sweep rate corresponding to multiple geological models with different degrees of heterogeneity under different oil-water viscosity ratios.

[0109] In this embodiment, for example, the oil-water viscosity ratio ranges from 1 to 50. Different oil-water viscosity ratios within this range are used as the oil-water viscosity ratios for geological models with heterogeneity levels of 10, 100, and 1000, representing permeability increments. The reservoir numerical simulation method is employed; alternatively, the water drive characteristic curve method or other methods can be used to determine the water drive sweep efficiency corresponding to different oil-water viscosity ratios for geological models with permeability increments of 10, 100, and 1000. Figure 10 As shown, the first horizontal row represents the geological models with heterogeneity levels of permeability differences of 10, 100, and 1000, and the first column represents different oil-water viscosity ratios. The first data row corresponds to the geological models with heterogeneity levels of permeability differences of 10, 100, and 1000, with water drive sweep power of 0.966, 0.840, and 0.633 respectively when the oil-water viscosity ratio is 1, and so on for the second data row, the third data row, and so on.

[0110] Step S206: Based on the water drive sweep extent corresponding to different oil-water viscosity ratios under different heterogeneity levels of multiple geological models, establish a one-way relationship expression between oil-water viscosity ratio and water drive sweep extent.

[0111] In this embodiment, for example, according to Figure 10The geological models shown, with permeability increments of 10, 100, and 1000, represent heterogeneity levels corresponding to water drive sweep efficiency at oil-water viscosity ratios of 1, 2, 5, 10, 20, and 50, respectively. These models are used to establish... Figure 11 The curves showing the oil-water viscosity ratio and water drive sweep efficiency, along with their unidirectional relationship, are illustrated. The horizontal axis represents the oil-water viscosity ratio, and the vertical axis represents the water drive sweep efficiency. Specifically, for permeability increments of 10, 100, and 1000, the unidirectional relationship between the oil-water viscosity ratio and the water drive sweep efficiency is expressed as y = -0.126ln(x) + 0.9971, y = -0.122ln(x) + 0.8454, and y = -0.11ln(x) + 0.631, respectively. Here, y represents the water drive sweep efficiency, and x represents the oil-water viscosity ratio. R... 2 This indicates the precision of the curve; the closer it is to 1, the higher the precision.

[0112] Step S207: Using the optimal algorithm, the unidirectional relationship between oil-water viscosity ratio and water drive sweepability and the comprehensive relationship between heterogeneous geological parameters and water drive sweepability are processed to establish the theoretical relationship expression of water drive sweepability coefficient.

[0113] In this embodiment, for example, the least squares method is used to process the unidirectional relationship between the oil-water viscosity ratio and the water drive sweep rate, as well as the comprehensive relationship between heterogeneous geological parameters and the water drive sweep rate, to establish a theoretical relationship for the water drive sweep rate coefficient. The formula for the theoretical relationship of the water drive sweep rate coefficient is E. w =0.6979+0.3333J k -0.117 -0.0398V k 2 -0.0069T k 2 -0.0547V k -0.0244T k -0.12lnU OW E w J represents the extent of water drive impact. k V represents the permeability gradient. k T is the coefficient of variation. k U is the surge coefficient. OW This refers to the oil-water viscosity ratio.

[0114] Steps S205-S207 establish the theoretical relationship expression of the water drive sweep efficiency. Steps S205-S207 can be executed or not.

[0115] The specific process for assessing the extent of water drive sweepstake includes the following steps:

[0116] Step S211: Based on the number of development layers and permeability data of each layer in the development layer design scheme of the reservoir to be evaluated, determine the permeability gradient, coefficient of variation and breakthrough coefficient of the development layer system.

[0117] In this implementation, for example, the reservoir to be evaluated is a reservoir in a certain oilfield, and the reservoir development system of that oilfield is the South II section, which is mainly composed of sandstone and conglomerate. Vertically, the South II section is divided into two oil groups, I and II. Oil group I is further subdivided into 10 small reservoirs, and oil group II is subdivided into 12 small reservoirs, for a total of 22 small reservoirs in the South II section. The existing development system design scheme for oil groups I and II adopts a single development scheme. The well pattern of this development scheme is a square inverse nine-point well pattern, with an injection-production well spacing of 200 to 250 meters. The permeability gradient of this development system design scheme is 10.0, the average breakthrough coefficient is 2.5, and the coefficient of variation is 0.98.

[0118] Step S212: Determine the water drive sweep rate of the reservoir to be evaluated based on the heterogeneous geological parameters of the reservoir to be evaluated and the pre-established comprehensive relationship between the heterogeneous geological parameters and the water drive sweep rate.

[0119] In this embodiment, the heterogeneous geological parameters of the reservoir to be evaluated are processed using a pre-established comprehensive relationship between heterogeneous geological parameters and water drive sweep susceptibility to obtain the water drive sweep susceptibility of the reservoir. For example, using... Calculations were performed with a permeability gradient of 10.0, an average breakthrough coefficient of 2.5, and a coefficient of variation of 0.98, yielding a water drive sweep rate of 76% for a development layer design scheme.

[0120] In this embodiment, for example, the stratigraphic division of the development stratigraphic design scheme for the South II section is adjusted. Different development stratigraphic design schemes are adopted for oil groups I and II, with oil group I being the first development stratigraphic design scheme and oil group II being the second development stratigraphic design scheme. Based on the first and second development stratigraphic design schemes, the permeability difference, breakthrough coefficient, and coefficient of variation for oil groups I and II are determined respectively. The permeability difference for oil group I is found to be 7.5, the breakthrough coefficient to be 1.5, and the coefficient of variation to be 0.57. Calculations were performed using parameters with a permeability gradient of 7.5, a breakthrough coefficient of 1.5, and a coefficient of variation of 0.57. The water drive sweep efficiency for oil group I was found to be 86%; the permeability gradient for oil group II was found to be 6.4, a breakthrough coefficient of 1.5, and a coefficient of variation of 0.47. Calculations were performed using parameters with a permeability gradient of 6.4, a breakthrough coefficient of 1.5, and a coefficient of variation of 0.47, yielding a water drive sweep efficiency of 85% for Oil Group II. Based on the calculation results for the water drive sweep efficiency of Oil Groups I and II, it is evident that the water drive sweep efficiency of the reclassified development layer design schemes for both Oil Groups I and II exceeds 85%, representing an 11.5% improvement compared to the water drive sweep efficiency achieved by using a single development layer design scheme for both Oil Groups I and II.

[0121] Step S213: Based on the development stratigraphic design scheme of the reservoir to be evaluated, determine the heterogeneous geological parameters and oil-water viscosity ratio of the reservoir to be evaluated.

[0122] In this embodiment, for example, based on the development layer design scheme for the South III section, the permeability difference, breakthrough coefficient, coefficient of variation, and oil-water viscosity ratio of the South III section are determined.

[0123] Step S214: Determine the water drive sweep rate of the reservoir to be evaluated based on the heterogeneous geological parameters, oil-water viscosity ratio, and theoretical relationship between the water drive sweep rate and the reservoir to be evaluated.

[0124] In this embodiment, the water drive sweep efficiency is expressed using the theoretical relationship of the water drive sweep efficiency. This is achieved by processing the heterogeneous geological parameters and oil-water viscosity ratio of the reservoir to be evaluated, thus obtaining the water drive sweep efficiency of the reservoir. For example, using E... w =0.6979+0.3333J k -0.117 -0.0398V k 2 -0.0069T k 2 -0.0547V k -0.0244T k -0.12lnU OW The permeability gradient, breakthrough coefficient, coefficient of variation, and oil-water viscosity ratio parameters of the South III section were calculated to obtain the water drive sweep extent of the South III section.

[0125] Steps S213 to S214 are processes that use the theoretical relationship of water drive sweep efficiency to process the heterogeneous geological parameters and oil-water viscosity ratio of the reservoir to be evaluated, and obtain the water drive sweep efficiency of the reservoir to be evaluated. Steps S213 to S214 can be selected to be executed.

[0126] As can be seen from the above embodiments, heterogeneous parameters within a reservoir development system, such as permeability gradient, coefficient of variation, and surge coefficient, are not fixed. Generally, the more sub-layers within a development system, the greater the differences in physical properties between them, and the larger the permeability gradient, coefficient of variation, and surge coefficient of the development system. Adjusting the sub-layer division within a development system can group sub-layers with similar physical properties into one system, significantly reducing the heterogeneity of the system and thereby improving waterflood sweepability and recovery rate.

[0127] Based on the same inventive concept, embodiments of the present invention provide a water drive sweep rate evaluation device based on vertical reservoir heterogeneity, the structure of which is as follows: Figure 12 As shown, it includes: parameter acquisition module 201, evaluation module 202, and pre-construction module 203.

[0128] The parameter acquisition module is used to determine the heterogeneous geological parameters of the reservoir to be evaluated based on the development stratigraphic design scheme of the reservoir to be evaluated; the heterogeneous geological parameters include permeability gradient, coefficient of variation and surge coefficient;

[0129] The evaluation module is used to determine the water drive sweep rate of the reservoir to be evaluated based on the heterogeneous geological parameters of the reservoir to be evaluated and the pre-established comprehensive relationship between the heterogeneous geological parameters and the water drive sweep rate.

[0130] A pre-built module is used to select multiple sets of different heterogeneous geological parameters of the reference development strata and establish multiple geological models with different degrees of heterogeneity of the reference development strata accordingly. The selected oil and gas reservoir analysis method is used to determine the water drive sweep degree corresponding to the multiple geological models. Based on the water drive sweep degree corresponding to the multiple geological models, a comprehensive relationship expression between the heterogeneous geological parameters and the water drive sweep degree is established.

[0131] Based on the same inventive concept, embodiments of the present invention provide a computer storage medium storing computer-executable instructions, which, when executed by a processor, implement the water drive sweep efficiency evaluation method based on vertical reservoir heterogeneity as described above.

[0132] Based on the same inventive concept, embodiments of the present invention provide a water drive sweep efficiency evaluation device based on vertical reservoir heterogeneity, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the water drive sweep efficiency evaluation method based on vertical reservoir heterogeneity as described above.

[0133] This invention selects multiple sets of different heterogeneous geological parameters of the reference development strata and establishes corresponding geological models with different degrees of heterogeneity for the reference development strata, providing multiple geological models with different degrees of heterogeneity for subsequent research. Using selected reservoir analysis methods, the water drive sweep radii corresponding to the multiple geological models are determined, providing different heterogeneous geological parameters and corresponding water drive sweep radii for subsequent research. Based on the water drive sweep radii corresponding to the multiple geological models, a comprehensive relationship expression between heterogeneous geological parameters and water drive sweep radii is established. Through rigorous mathematical calculations using discrete numerical heterogeneous geological parameters and their corresponding water drive sweep radii, an accurate relationship expression between heterogeneous geological parameters and water drive sweep radii is obtained. By using the accurate relationship expression between heterogeneous geological parameters and water drive sweep radii for the reservoir to be evaluated, an accurate water drive sweep radii for the reservoir to be evaluated is obtained, meeting the actual needs of the project.

[0134] Furthermore, within a preset range of oil-water viscosity ratios, different oil-water viscosity ratios are taken as the oil-water viscosity ratios for each geological model with varying degrees of heterogeneity. Using selected reservoir analysis methods, the water drive sweep efficiency corresponding to these geological models with different degrees of heterogeneity at different oil-water viscosity ratios is determined. This provides different oil-water viscosity ratios and their corresponding values, offering data support for subsequent research. Based on the water drive sweep efficiency corresponding to these geological models with varying degrees of heterogeneity at different oil-water viscosity ratios, a one-way relationship between oil-water viscosity ratio and water drive sweep efficiency is established. Using an optimal algorithm, the one-way relationship between oil-water viscosity ratio and water drive sweep efficiency, as well as the comprehensive relationship between heterogeneous geological parameters and water drive sweep efficiency, is processed to establish a theoretical relationship for the water drive sweep efficiency coefficient. Based on the development stratigraphic design scheme of the reservoir to be evaluated, the heterogeneous geological parameters and oil-water viscosity ratio of the reservoir to be evaluated are determined. Based on the theoretical relationship between the heterogeneous geological parameters, oil-water viscosity ratio, and water drive sweep efficiency coefficient of the reservoir to be evaluated, the accurate water drive sweep efficiency of the reservoir to be evaluated is obtained.

[0135] Furthermore, the water drive sweep extent predicted by this invention guides the re-division of existing oil extraction schemes. The water drive sweep extent of the re-divisiond extraction schemes meets the extraction requirements, thereby increasing the amount of oil and gas extracted.

[0136] Unless otherwise specifically stated, terms such as processing, calculation, operation, determination, display, etc., may refer to the actions and / or processes of one or more processing or computing systems or similar devices that represent the manipulation and conversion of data representing physical (e.g., electronic) quantities within the registers or memory of the processing system into other data similarly representing physical quantities within the memory, registers, or other such information storage, transmission, or display devices of the processing system. Information and signals can be represented using any of a variety of different techniques and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips mentioned throughout the above description can be represented by voltage, current, electromagnetic waves, magnetic fields or particles, light fields or particles, or any combination thereof.

[0137] It should be understood that the specific order or hierarchy of steps in the disclosed process is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process may be rearranged without departing from the scope of this disclosure. The appended method claims provide elements of various steps in an exemplary order and are not intended to limit the scope to the specific order or hierarchy described.

[0138] In the detailed description above, various features are combined together in a single embodiment to simplify this disclosure. This approach to disclosure should not be construed as reflecting an intention that embodiments of the claimed subject matter require more features than are explicitly stated in each claim. Rather, as reflected in the appended claims, the invention is presented with fewer features than all of the features in a single disclosed embodiment. Therefore, the appended claims are hereby explicitly incorporated into the detailed description, with each claim representing a separate preferred embodiment of the invention.

[0139] Those skilled in the art will also understand that the various illustrative logic blocks, modules, circuits, and algorithm steps described in conjunction with the embodiments herein can be implemented as electronic hardware, computer software, or a combination thereof. To clearly illustrate the interchangeability between hardware and software, the various illustrative components, blocks, modules, circuits, and steps described above are generally described in terms of their functionality. Whether such functionality is implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system. Those skilled in the art can implement the described functionality in alternative ways for each specific application; however, such implementation decisions should not be construed as departing from the scope of this disclosure.

[0140] The steps of the methods or algorithms described in conjunction with the embodiments herein can be directly embodied in hardware, software modules executed by a processor, or a combination thereof. The software modules can reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disks, removable disks, CD-ROMs, or any other form of storage medium well known in the art. An exemplary storage medium is connected to the processor, enabling the processor to read information from and write information to the storage medium. Of course, the storage medium can also be a component of the processor. The processor and storage medium can reside in an ASIC. The ASIC can reside in a user terminal. Alternatively, the processor and storage medium can exist as discrete components in the user terminal.

[0141] For software implementation, the techniques described in this application can be implemented using modules (e.g., procedures, functions, etc.) that perform the functions described in this application. This software code can be stored in memory units and executed by a processor. The memory units can be implemented within the processor or outside the processor; in the latter case, they are communicatively coupled to the processor via various means, as is well known in the art.

[0142] The foregoing description includes examples of one or more embodiments. It is certainly impossible to describe all possible combinations of components or methods in order to describe the above embodiments, but those skilled in the art will recognize that further combinations and arrangements of the various embodiments are possible. Therefore, the embodiments described herein are intended to cover all such changes, modifications, and variations that fall within the scope of the appended claims. Furthermore, the term "comprising" as used in the specification or claims is interpreted in a manner similar to the term "including," as interpreted when used as a conjunction in the claims. Additionally, the use of any term "or" in the specification of the claims is intended to mean "non-exclusive or."

Claims

1. A method for evaluating the water drive sweep rate based on the vertical reservoir heterogeneity, characterized in that, include: Based on the development stratigraphic design scheme of the reservoir to be evaluated, determine the heterogeneous geological parameters of the reservoir to be evaluated; The heterogeneous geological parameters include permeability gradient, coefficient of variation, and burst coefficient; The water drive sweep extent of the reservoir to be evaluated is determined based on the heterogeneous geological parameters of the reservoir to be evaluated and the pre-established comprehensive relationship between the heterogeneous geological parameters and the water drive sweep extent. The process of establishing the comprehensive relation expression includes: Multiple sets of different heterogeneous geological parameters of the reference development strata are selected, and corresponding geological models of different degrees of heterogeneity of the reference development strata are established. The selected hydrocarbon reservoir analysis methods were used to determine the water drive sweep extent for each of the geological models. Based on the water drive sweep extent corresponding to multiple geological models, a comprehensive relationship expression between heterogeneous geological parameters and water drive sweep extent is established.

2. The method as described in claim 1, characterized in that, Based on the development stratigraphic design scheme of the reservoir to be evaluated, the heterogeneous geological parameters of the reservoir to be evaluated are determined, including: Based on the number of development layers and permeability data of each layer in the development layer design scheme of the reservoir to be evaluated, the permeability gradient, coefficient of variation, and breakthrough coefficient of the development layer system are determined.

3. The method as described in claim 1, characterized in that, Multiple sets of different heterogeneous geological parameters of the reference development strata were selected, and corresponding geological models of different degrees of heterogeneity of the development strata were established. Within the preset range of heterogeneous geological parameters, select multiple sets of heterogeneous geological parameters of the reference development strata; For each set of heterogeneous geological parameters, based on the heterogeneous geological parameters and the preset average permeability, the permeability data of each layer in the reference development system is determined, and a geological model of the development system is established based on the permeability data.

4. The method as described in claim 3, characterized in that, The permeability gradient ranges from 1 to 10,000, the coefficient of variation ranges from 0 to 1.76, and the breakthrough coefficient ranges from 1.0 to 4.

5.

5. The method as described in claim 1, characterized in that, Based on the water drive sweep extent corresponding to multiple geological models, a comprehensive relationship expression between heterogeneous geological parameters and water drive sweep extent is established, including: Based on the water drive sweep extent corresponding to multiple geological models, unidirectional relationships between permeability gradient and water drive sweep extent, unidirectional relationships between coefficient of variation and water drive sweep extent, and unidirectional relationships between advance coefficient and water drive sweep extent are established respectively. By using optimal mathematical algorithms to process the one-way relationship between water drive sweepability, the one-way relationship between coefficient of variation and water drive sweepability, and the one-way relationship between surge coefficient and water drive sweepability, a comprehensive relationship expression between permeability gradient, coefficient of variation, surge coefficient and water drive sweepability is established.

6. The method as described in claim 5, characterized in that, The unidirectional relationship between permeability gradients and water drive sweepability is expressed as follows: y=x -0.117 ; Where y represents the water drive sweep rate and x represents the permeability difference; The unidirectional relationship between the coefficient of variation and the extent of water drive sweep is expressed as follows: y=-0.1195x 2 -0.1641x+1.0; Where y represents the water drive sweep extent and x represents the coefficient of variation; The unidirectional relationship between the surge coefficient and the water drive sweep rate is expressed as follows: y=-0.0206x 2 -0.0731x+1.0937; Where y is the water drive sweep rate and x is the surge coefficient; The comprehensive relationship between permeability gradient, coefficient of variation, surge coefficient, and water drive sweepability is expressed as follows: Among them, E w J represents the extent of water drive impact. k V represents the permeability gradient. k T is the coefficient of variation. k This is the surge coefficient.

7. The method as described in claim 1, characterized in that, Based on the water drive sweep radii corresponding to multiple geological models, after establishing a comprehensive expression of the relationship between heterogeneous geological parameters and water drive sweep radii, the following is also included: Within the preset range of oil-water viscosity ratio, different oil-water viscosity ratios are taken as the oil-water viscosity ratios of each geological model with different degrees of heterogeneity. Using the selected oil and gas reservoir analysis method, the water drive sweep degree corresponding to the multiple geological models with different degrees of heterogeneity under different oil-water viscosity ratios is determined. Based on the water drive sweep extent corresponding to different oil-water viscosity ratios under multiple geological models with different degrees of heterogeneity, a one-way relationship between oil-water viscosity ratio and water drive sweep extent is established. By utilizing the optimal algorithm to process the unidirectional relationship between oil-water viscosity ratio and water drive sweepability, as well as the comprehensive relationship between heterogeneous geological parameters and water drive sweepability, a theoretical relationship expression for water drive sweepability coefficient is established.

8. The method as described in claim 7, characterized in that, The oil-water viscosity ratio ranges from 1 to 50.

9. The method as described in claim 7, characterized in that, The unidirectional relationship between the oil-water viscosity ratio and the water drive sweepability is expressed as follows, with different specified permeability gradients: y=-0.126ln(x)+0.9971, y=-0.122ln(x)+0.8454, y=-0.11ln(x)+0.631; Where y is the water drive sweep rate and x is the oil-water viscosity ratio; The theoretical relationship of the water drive sweep efficiency is expressed as follows: E w =0.6979+0.3333J k -0.117 -0.0398V k 2 -0.0069T k 2 -0.0547V k -0.0244T k -0.12lnU OW ; Among them, E w J represents the extent of water drive impact. k V represents the permeability gradient. k T is the coefficient of variation. k U is the surge coefficient. OW This refers to the oil-water viscosity ratio.

10. The method as described in claim 7, characterized in that, After establishing the theoretical relationship for the water drive sweep efficiency, the following is also included: Based on the development stratigraphic design scheme of the reservoir to be evaluated, determine the heterogeneous geological parameters and oil-water viscosity ratio of the reservoir to be evaluated; The degree of water drive sweep efficiency of the reservoir under evaluation is determined based on the theoretical relationship between the heterogeneous geological parameters, oil-water viscosity ratio, and water drive sweep efficiency of the reservoir under evaluation.

11. A waterflood sweep efficiency evaluation device based on vertical reservoir heterogeneity, characterized in that, include: The parameter acquisition module is used to determine the heterogeneity geological parameters of the reservoir to be evaluated based on the development stratigraphic design scheme of the reservoir to be evaluated. The heterogeneous geological parameters include permeability gradient, coefficient of variation, and burst coefficient; The evaluation module is used to determine the water drive sweep rate of the reservoir to be evaluated based on the heterogeneous geological parameters of the reservoir to be evaluated and the pre-established comprehensive relationship between the heterogeneous geological parameters and the water drive sweep rate. A pre-built module is used to select multiple sets of different heterogeneous geological parameters of the reference development strata and establish multiple geological models with different degrees of heterogeneity of the reference development strata accordingly. The selected oil and gas reservoir analysis method is used to determine the water drive sweep degree corresponding to the multiple geological models. Based on the water drive sweep degree corresponding to the multiple geological models, a comprehensive relationship expression between the heterogeneous geological parameters and the water drive sweep degree is established.

12. A computer storage medium, characterized in that, The computer storage medium stores computer-executable instructions, which, when executed by a processor, implement the water drive sweep efficiency evaluation method based on longitudinal reservoir heterogeneity as described in any one of claims 1-10.

13. A waterflood sweep efficiency evaluation device based on vertical reservoir heterogeneity, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the program, implements the water drive sweep efficiency evaluation method based on longitudinal reservoir heterogeneity as described in any one of claims 1-10.

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