Method for evaluating underground injectable capacity of high-salinity mine water

Abstract

The invention relates to a method for evaluating underground injectable capacity of high-salinity mine water. The method comprises the following steps: collecting geological data of an evaluation area; the geological data comprises a plurality of geological parameters; dividing the evaluation area into a plurality of sub-areas according to the geological data; calculating a weighting coefficient corresponding to each geological parameter in each sub-region; calculating an injectable index of each sub-region according to the weighting coefficient; calculating the actual reinjection quantity and the limit reinjection quantity of the single well corresponding to each sub-region; and determining a first injectable ability evaluation result of each sub-region according to the injectable index, determining a second injectable ability evaluation result of each sub-region according to the actual reinjection amount and the limit reinjection amount, and determining a final injectable ability evaluation result of each sub-region according to the first injectable ability evaluation result and the second injectable ability evaluation result. The deep well reinjection storage capacity problem of the hypersalinity mine water is solved, and the technical effect of providing a scientific basis for hypersalinity mine water storage and decision making is achieved.

Description

Technical Field

[0001] This application relates to the field of mine ecological protection and environmental governance. Specifically, it relates to a method for evaluating the underground injectability of high-salinity mine water. Background Art

[0002] Due to its characteristics such as high salt content and high hardness, the direct discharge of high-salinity mine water will have a serious impact on the environment. Therefore, it is of great significance to explore its underground storage and reuse ways. Adopting the deep well reinjection technology is a practical method to alleviate high-salinity mine water. This technology can greatly reduce the treatment cost. In the future, with the continuous development of technology and the expansion of application, the underground storage technology of high-salinity mine water is expected to become one of the important means for in-situ protection and utilization of coal mine water. However, there is less research on the evaluation method of underground injectability in the existing technology. Summary of the Invention

[0003] In order to overcome at least one deficiency in the existing technology, this application provides a method for evaluating the underground injectability of high-salinity mine water.

[0004] In the first aspect, a method for evaluating the underground injectability of high-salinity mine water is provided, including:

[0005] Collecting geological data of the evaluation area; the geological data includes multiple geological parameters; the geological parameters include reservoir thickness, hydraulic conductivity, burial depth, and stability;

[0006] Dividing the evaluation area into multiple sub-areas according to the geological data;

[0007] Calculating the weighted coefficients corresponding to each geological parameter in each sub-area;

[0008] Calculating the injectability index of each sub-area according to the weighted coefficients;

[0009] Calculating the actual injection volume and the limit injection volume of single-well reinjection for each sub-area;

[0010] Determining the first injectability evaluation result of each sub-area according to the injectability index, determining the second injectability evaluation result of each sub-area according to the actual injection volume and the limit injection volume, and determining the final injectability evaluation result of each sub-area according to the first injectability evaluation result and the second injectability evaluation result.

[0011] In one embodiment, when calculating the injectability index of each sub-area according to the weighted coefficients, the following formula is used:

[0012]

[0013] where Ei is the injectability index of the i-th sub-area, and Hi is the average value of the reservoir thickness in the i-th sub-area, The weighted coefficient corresponding to the reservoir thickness of the i-th sub-region, Mi is the average value of the hydraulic conductivity in the i-th sub-region, βi is the weighted coefficient corresponding to the hydraulic conductivity of the i-th sub-region, hi is the average value of the buried depth in the i-th sub-region, δi is the weighted coefficient corresponding to the buried depth of the i-th sub-region, Wi is the average value of the stability in the i-th sub-region, and λi is the weighted coefficient corresponding to the stability of the i-th sub-region.

[0014] In one embodiment, the actual reinjection volume and the limit reinjection volume corresponding to each sub-region are calculated using the following formula:

[0015]

[0016] P = ∑L i X i

[0017] Q max = P × S × h × V × (1 - C) × (1 + F)

[0018] Where Q is the actual reinjection volume, P is the storage coefficient of the evaluation area, S is the fluid saturation, h is the reservoir thickness of the sub-region, R is the well control radius, r is the drilling radius of a single well, F is the fluid compressibility, C is the reservoir compressibility, and L i is the fracture rate of the i-th sub-region, X i is the effective water injection layer thickness of the i-th sub-region; V is the strike area of the sub-region, and Q max is the limit reinjection volume.

[0019] In one embodiment, the first injectability evaluation result of each sub-region is determined according to the injectability index, including:

[0020] If the injectability index > E1, the first injectability evaluation result is excellent;

[0021] If E2 ≤ injectability index ≤ E1, the first injectability evaluation result is ordinary;

[0022] If the injectability index < E2, the first injectability evaluation result is poor;

[0023] Where E2 < E1, and E1 and E2 are set values.

[0024] In one embodiment, the second injectability evaluation result of each sub-region is determined according to the actual reinjection volume and the limit reinjection volume, including:

[0025] If the ratio of the actual reinjection volume to the limit reinjection volume > a%, the second injectability evaluation result is excellent;

[0026] If b% ≤ the ratio of the actual reinjection volume to the limit reinjection volume ≤ a%, then the evaluation result of the second injectability is ordinary;

[0027] If the ratio of the actual reinjection volume to the limit reinjection volume < b%, then the evaluation result of the second injectability is poor;

[0028] Among them, b < a, and a and b are set values.

[0029] In one embodiment, according to the first injectability evaluation result and the second injectability evaluation result, the final injectability evaluation result of each sub-region is determined, including:

[0030] If both the first injectability evaluation result and the second injectability evaluation result are excellent, then the final injectability evaluation result is excellent;

[0031] If both the first injectability evaluation result and the second injectability evaluation result are ordinary, then the final injectability evaluation result is ordinary;

[0032] If there are excellent and ordinary in the first injectability evaluation result and the second injectability evaluation result, then the final injectability evaluation result is ordinary;

[0033] If there is a poor in the first injectability evaluation result and the second injectability evaluation result, then the final injectability evaluation result is poor.

[0034] In a second aspect, a device for evaluating the underground injectability of high salinity mine water is provided, including:

[0035] A data collection module for collecting geological data of the evaluation area; the geological data includes multiple geological parameters; the geological parameters include reservoir thickness, hydraulic conductivity, burial depth, and stability;

[0036] A sub-region division module for dividing the evaluation area into multiple sub-regions according to the geological data;

[0037] A weighted coefficient calculation module for calculating the weighted coefficients corresponding to each geological parameter in each sub-region;

[0038] An injectability index calculation module for calculating the injectability index of each sub-region according to the weighted coefficients;

[0039] A reinjection volume calculation module for calculating the actual reinjection volume and the limit reinjection volume of a single well corresponding to each sub-region;

[0040] An evaluation result determination module is configured to determine the first injectability evaluation result of each sub-region according to the injectability index, determine the second injectability evaluation result of each sub-region according to the actual reinjection volume and the limit reinjection volume, and determine the final injectability evaluation result of each sub-region according to the first injectability evaluation result and the second injectability evaluation result.

[0041] In a third aspect, a computer-readable storage medium is provided. The computer-readable storage medium stores a computer program, which when executed by a processor, implements the above-mentioned method for evaluating the underground injectability of high-salinity mine water.

[0042] In a fourth aspect, a computer program product is provided, including a computer program / instructions, which when executed by a processor, implements the above-mentioned method for evaluating the underground injectability of high-salinity mine water.

[0043] Compared with the prior art, the present application has the following beneficial effects: The method for evaluating the underground injectability of high-salinity mine water in the present application divides the evaluation area into multiple sub-regions, calculates the corresponding injectability index, the actual reinjection volume of a single well, and the limit reinjection volume of each sub-region, and comprehensively judges to determine the underground injectability of each sub-region. This method solves the problem of the deep well reinjection storage capacity of high-salinity mine water, and achieves the technical effect of providing a scientific basis for the storage and decision-making of high-salinity mine water. Description of the Drawings

[0044] The present application can be better understood by referring to the descriptions given below in conjunction with the accompanying drawings. The drawings, together with the following detailed description, are included in this specification and form a part of this specification. In the drawings:

[0045] Figure 1 A flowchart showing the method for evaluating the underground injectability of high-salinity mine water is shown;

[0046] Figure 2 A structural block diagram showing the device for evaluating the underground injectability of high-salinity mine water is shown. Detailed Embodiments

[0047] Hereinafter, exemplary embodiments of the present application will be described in conjunction with the accompanying drawings. For the sake of clarity and conciseness, not all features of the actual embodiments are described in the specification. However, it should be understood that many specific decisions specific to the embodiments can be made during the development of any such actual embodiment in order to achieve the specific goals of the developer, and these decisions may vary with different embodiments.

[0048] Here, it should also be noted that in order to avoid obscuring the present application due to unnecessary details, only the device structures closely related to the solution according to the present application are shown in the drawings, while other details less relevant to the present application are omitted.

[0049] It should be understood that the present application is not limited to the described embodiments only due to the following description with reference to the drawings. In this document, where feasible, embodiments can be combined with each other, features can be replaced or borrowed between different embodiments, and one or more features can be omitted in one embodiment.

[0050] An embodiment of the present application provides a method for evaluating the underground injectability of high-salinity mine water. Figure 1 The flowchart of the method for evaluating the underground injectability of high-salinity mine water is shown. Refer to Figure 1 , and the method mainly includes the following steps:

[0051] Step S1, collect geological data of the evaluation area; the geological data includes multiple geological parameters; the geological parameters include reservoir thickness, hydraulic conductivity, burial depth, and stability.

[0052] Step S2, divide the evaluation area into multiple sub-areas according to the geological data.

[0053] Here, when dividing the sub-areas, important parameters can be selected according to the importance of the parameters, such as the reservoir thickness, and the evaluation area can be divided into multiple sub-areas, and the areas with the reservoir thickness in the same interval can be divided into the same sub-area.

[0054] Step S3, calculate the weighted coefficients corresponding to each geological parameter in each sub-area.

[0055] Here, methods such as the multi-criteria decision-making model method and the Monte Carlo method can be used to calculate the weighted coefficients corresponding to each geological parameter.

[0056] Step S4, calculate the injectability index of each sub-area according to the weighted coefficients.

[0057] Specifically, the following formula is used:

[0058]

[0059] Among them, Ei is the injectability index of the i-th sub-area, and Hi is the average value of the reservoir thickness in the i-th sub-area. is the weighting coefficient corresponding to the reservoir thickness of the i-th sub-region, Mi is the average value of the hydraulic conductivity in the i-th sub-region, βi is the weighting coefficient corresponding to the hydraulic conductivity of the i-th sub-region, hi is the average value of the buried depth in the i-th sub-region, δi is the weighting coefficient corresponding to the buried depth of the i-th sub-region, Wi is the average value of the stability in the i-th sub-region, and λi is the weighting coefficient corresponding to the stability of the i-th sub-region.

[0060] Step S5, calculate the actual injection volume and the limit injection volume of each single well for reinjection in each sub-region.

[0061] Specifically, the following formula is used:

[0062]

[0063] P = ΣL i X i

[0064] Q max = P × S × h × V × (1 - C) × (1 + F)

[0065] where Q is the actual injection volume, P is the storage coefficient of the evaluation area, S is the fluid saturation, h is the reservoir thickness of the sub-region, R is the well control radius, r is the drilling radius of a single well, F is the fluid compressibility, C is the reservoir compressibility, L i is the fracture rate of the i-th sub-region, X i is the effective water injection layer thickness of the i-th sub-region; V is the strike area of the sub-region, Q max is the limit injection volume.

[0066] Step S6, determine the first injectability evaluation result of each sub-region according to the injectability index, determine the second injectability evaluation result of each sub-region according to the actual injection volume and the limit injection volume, and determine the final injectability evaluation result of each sub-region according to the first injectability evaluation result and the second injectability evaluation result.

[0067] Specifically, determining the first injectability evaluation result of each sub-region according to the injectability index includes:

[0068] If the injectability index > E1, the first injectability evaluation result is excellent;

[0069] If E2 ≤ the injectability index ≤ E1, the first injectability evaluation result is ordinary;

[0070] If the injectability index < E2, the first injectability evaluation result is poor;

[0071] where E2 < E1, and E1 and E2 are set values. For example, E1 = 8 and E2 = 6.

[0072] Specifically, the second injectability evaluation results of each sub-region are determined according to the actual reinjection volume and the limit reinjection volume, including:

[0073] If the ratio of the actual reinjection volume to the limit reinjection volume > a%, the second injectability evaluation result is excellent;

[0074] If b% ≤ the ratio of the actual reinjection volume to the limit reinjection volume ≤ a%, the second injectability evaluation result is ordinary;

[0075] If the ratio of the actual reinjection volume to the limit reinjection volume < b%, the second injectability evaluation result is poor;

[0076] Wherein, b < a, and a and b are set values. For example, a = 8 and b = 6.

[0077] Specifically, according to the first injectability evaluation result and the second injectability evaluation result, the final injectability evaluation result of each sub-region is determined, including:

[0078] If both the first injectability evaluation result and the second injectability evaluation result are excellent, the final injectability evaluation result is excellent;

[0079] If both the first injectability evaluation result and the second injectability evaluation result are ordinary, the final injectability evaluation result is ordinary;

[0080] If there are excellent and ordinary results among the first injectability evaluation result and the second injectability evaluation result, the final injectability evaluation result is ordinary;

[0081] If there is a poor result among the first injectability evaluation result and the second injectability evaluation result, the final injectability evaluation result is poor.

[0082] In the above embodiments, by dividing the evaluation area into multiple sub-regions, calculating the injectability index, the actual reinjection volume of each single well and the limit reinjection volume corresponding to each sub-region, and comprehensively judging to determine the underground injectability of each sub-region. This method solves the problem of the deep well reinjection storage capacity of high salinity mine water, and realizes the technical effect of providing a scientific basis for the storage and decision-making of high salinity mine water.

[0083] Based on the same inventive concept as the evaluation method for the underground injectability of high salinity mine water, this embodiment also provides a corresponding evaluation device for the underground injectability of high salinity mine water. Figure 2 The structural block diagram of the evaluation device for the underground injectability of high salinity mine water is shown, including:

[0084] A data collection module 21 for collecting geological data of the evaluation area; the geological data includes multiple geological parameters; the geological parameters include reservoir thickness, hydraulic conductivity, burial depth, and stability;

[0085] A sub - area division module 22 for dividing the evaluation area into multiple sub - areas according to the geological data;

[0086] A weighted coefficient calculation module 23 for calculating the weighted coefficients corresponding to each geological parameter in each sub - area;

[0087] An injectability index calculation module 24 for calculating the injectability index of each sub - area according to the weighted coefficients;

[0088] A reinjection volume calculation module 25 for calculating the actual reinjection volume and the limit reinjection volume of a single well corresponding to each sub - area;

[0089] An evaluation result determination module 26 for determining the first injectability evaluation result of each sub - area according to the injectability index, determining the second injectability evaluation result of each sub - area according to the actual reinjection volume and the limit reinjection volume, and determining the final injectability evaluation result of each sub - area according to the first injectability evaluation result and the second injectability evaluation result.

[0090] The high - salinity mine water underground injectability evaluation device of this embodiment has the same inventive concept as the high - salinity mine water underground injectability evaluation method above. Therefore, the specific implementation manner of this device can be seen in the embodiment part of the high - salinity mine water underground injectability evaluation method in the previous text, and its technical effects correspond to those of the above - mentioned method, which will not be elaborated here.

[0091] This application embodiment provides a computer - readable storage medium. The computer - readable storage medium stores a computer program. When the computer program is executed by a processor, it realizes the above - mentioned high - salinity mine water underground injectability evaluation method.

[0092] This application embodiment provides a computer program product, including a computer program / instructions. When the computer program / instructions are executed by a processor, they realize the above - mentioned high - salinity mine water underground injectability evaluation method.

[0093] The above are only various implementation manners of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art within the technical scope disclosed by this application can easily think of changes or substitutions, which should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claimed rights.

Claims

1. A method for evaluating the underground injectability of high salinity mine water, characterized in that, Including: Collecting geological data of the evaluation area; the geological data includes multiple geological parameters; the geological parameters include reservoir thickness, hydraulic conductivity, burial depth, and stability; Dividing the evaluation area into multiple sub-areas according to the geological data; Calculating the weighting coefficients corresponding to each geological parameter in each sub-area; Calculating the injectability index of each sub-area according to the weighting coefficients; Calculating the actual reinjection volume and the limit reinjection volume of a single well for reinjection in each sub-area; Determining the first injectability evaluation result of each sub-area according to the injectability index, determining the second injectability evaluation result of each sub-area according to the actual reinjection volume and the limit reinjection volume, and determining the final injectability evaluation result of each sub-area according to the first injectability evaluation result and the second injectability evaluation result.

2. The method according to claim 1, characterized in that Wherein, Calculating the injectability index of each sub-area according to the weighting coefficients, using the following formula: Among them, Ei is the injectivity index of the i-th sub-region, and Hi is the average value of the reservoir thickness in the i-th sub-region. is the weighting coefficient corresponding to the reservoir thickness of the i-th sub-region, Mi is the average value of the hydraulic conductivity in the i-th sub-region, βi is the weighting coefficient corresponding to the hydraulic conductivity of the i-th sub-region, hi is the average value of the burial depth in the i-th sub-region, δi is the weighting coefficient corresponding to the burial depth of the i-th sub-region, Wi is the average value of the stability in the i-th sub-region, and λi is the weighting coefficient corresponding to the stability of the i-th sub-region.

3. The method according to claim 1, wherein Wherein, Calculating the actual reinjection volume and the limit reinjection volume of a single well for reinjection in each sub-area, using the following formula: P = ∑L i X i Q max = P × S × h × V × (1 - C) × (1 + F) Among them, Q is the actual reinjection volume, P is the storage coefficient of the evaluation area, S is the fluid saturation, h is the reservoir thickness of the sub-area, R is the well control radius, r is the drilling radius of a single well, F is the fluid compressibility, C is the reservoir compressibility, L i is the fracture rate of the i-th sub-area, X i is the effective water injection layer thickness of the i-th sub-area; V is the strike area of the sub-area, Q max is the limit reinjection volume.

4. The method according to claim 1, characterized in that, Wherein, Determining the first injectability evaluation result of each sub-area according to the injectability index, including: If the injectability index > E1, the first injectability evaluation result is excellent; If E2 ≤ injectability index ≤ E1, the first injectability evaluation result is ordinary; If the injectability index < E2, the first injectability evaluation result is poor; Wherein, E2 < E1, and E1 and E2 are set values.

5. The method according to claim 1, wherein Wherein, Determining the second injectability evaluation result of each sub-area according to the actual reinjection volume and the limit reinjection volume, including: If the ratio of the actual reinjection volume to the limit reinjection volume > a%, the second injectability evaluation result is excellent; If b% ≤ ratio of the actual reinjection volume to the limit reinjection volume ≤ a%, the second injectability evaluation result is ordinary; If the ratio of the actual reinjection volume to the limit reinjection volume < b%, the second injectability evaluation result is poor; Wherein, b < a, and a and b are set values.

6. The method according to claim 1, wherein Wherein, Determining the final injectability evaluation result of each sub-area according to the first injectability evaluation result and the second injectability evaluation result, including: If both the first injectability evaluation result and the second injectability evaluation result are excellent, the final injectability evaluation result is excellent; If both the first injectability evaluation result and the second injectability evaluation result are ordinary, the final injectability evaluation result is ordinary; If there is an excellent and an ordinary among the first injectability evaluation result and the second injectability evaluation result, the final injectability evaluation result is ordinary; If there is a poor among the first injectability evaluation result and the second injectability evaluation result, the final injectability evaluation result is poor.

7. An evaluation device for the underground injectability of high salinity mine water, characterized in that, Including: A data collection module for collecting geological data of the evaluation area; the geological data includes multiple geological parameters; the geological parameters include reservoir thickness, hydraulic conductivity, burial depth, and stability; A sub-area division module for dividing the evaluation area into multiple sub-areas according to the geological data; A weighting coefficient calculation module for calculating the weighting coefficients corresponding to each geological parameter in each sub-area; An injectability index calculation module, configured to calculate the injectability index of each sub-region according to the weighting coefficient; A reinjection volume calculation module, configured to calculate the actual reinjection volume and the limit reinjection volume of a single well corresponding to each sub-region; An evaluation result determination module, configured to determine the first injectability capacity evaluation result of each sub-region according to the injectability index, determine the second injectability capacity evaluation result of each sub-region according to the actual reinjection volume and the limit reinjection volume, and determine the final injectability capacity evaluation result of each sub-region according to the first injectability capacity evaluation result and the second injectability capacity evaluation result.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, which, when executed by a processor, implements the method for evaluating the underground injectability capacity of high-salinity mine water according to any one of claims 1-6.

9. A computer program product, characterized in that, It includes a computer program / instructions, which, when executed by a processor, implement the method for evaluating the underground injectability capacity of high-salinity mine water according to any one of claims 1-6.

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