Thick-layer heat storage highly-deviated well taking and irrigation development method and system

Abstract

The invention discloses a thick-layer heat storage highly-deviated well taking and irrigation development method and system, and relates to the technical field of geothermal development, the method comprises the following steps: step S101, carrying out thick-layer heat storage and heterogeneity evaluation research, and determining a heat storage distribution rule; step S102, according to a heat storage distribution rule, designing a highly-deviated well taking and filling well pattern; and S103, optimizing the spatial position of the well pattern for taking and irrigating the highly-deviated well. By establishing a thick-layer heat storage highly-deviated well taking and filling development mode, the thick-layer heat storage taking and filling effect can be greatly improved, and the problems that a conventional vertical well is low in water taking strength and refilling strength are solved; and geothermal wells can be saved, the purpose of improving the heat utilization rate is achieved, and therefore a new large-scale taking and filling mode is established.

Description

Technical Field

[0001] The present invention relates to the field of geothermal development technology, and in particular to a method and system for extracting and injecting geothermal energy from a thick-layer heat storage well with a high deviation. Background Art

[0002] In 2021, the Shuguang Base Geothermal Utilization Project was demonstrated to achieve geothermal substitution in the Shuguang area, which is expected to save a total of 186.6×10 4 m 3 / a, reducing emissions by 5.75×10 4 t / a, the geothermal development of the third section of Shahejie in the F well area in the east of the base has entered the stage of plan preparation. The early pilot test confirmed that the water extraction and reinjection intensity of conventional vertical wells are limited. The dynamic evaluation of Huan Sanlian on-site extraction and reinjection showed that the maximum capacity of the water extraction well is 0.17-0.19m 3 / hm(4.0~4.5m 3 / dm); the maximum capacity of the reinjection well is 0.06~0.1m 3 / hm(1.4~2.4m 3 / dm). The edge of the oil zone in the F well area has developed thermal reservoirs, with a thickness of up to 250-400m, belonging to the thick-layer thermal reservoir type. Few wells have been drilled and some have been abandoned. Based on the previous research, it is believed that the high-angle wells have a large contact area with the thermal reservoir section. As injection wells, they can greatly improve the injection effect. Therefore, it is urgent to provide a development method for injection of high-angle wells in thick-layer thermal reservoirs. Summary of the invention

[0003] The purpose of the present invention is to provide a method and system for the development of thick-layer heat reservoir and high-angle well extraction and injection. The present invention relies on the detailed heat reservoir description research to achieve the purpose of greatly improving the extraction and injection effect. To achieve the above purpose, the present invention provides the following technical solutions:

[0004] The present invention provides a method for developing a thick-layer thermal reservoir with a high-angle well, the method comprising the following steps:

[0005] Step S101, conducting thick-layer heat storage and heterogeneity evaluation research to determine the heat storage distribution law;

[0006] Step S102, designing a high-angle well extraction and injection well network according to the heat reservoir distribution law;

[0007] Step S103, optimizing the spatial position of the high-angle well extraction and irrigation network.

[0008] Furthermore, the step S101, conducting thick-layer heat storage and heterogeneity evaluation research to determine the heat storage distribution law, specifically includes:

[0009] The stratigraphic framework and fault characteristics of the regional heat reservoir section are obtained by combining well data and seismic data. The thickness of the heat reservoir at the completed drilling position is obtained through well data, and the occurrence of heat reservoirs between wells is obtained by combining seismic data. The distribution law of heat reservoirs is described by the change law of seismic waveforms. Based on the well logging and mud recording data, the heterogeneity of the reservoir section is described, and the differences between heat reservoir sections at different positions in the section are characterized.

[0010] Furthermore, the heterogeneity description includes:

[0011] A comprehensive analysis of the reservoir properties of the proposed thermal reservoir section is conducted, core calibration logging is performed, permeability bar graphs at different locations are drawn, and the thermal reservoir is classified and segmented using the heterogeneity description method to determine the permeability difference level of different thermal reservoir sections.

[0012] Furthermore, the heat reservoir distribution law includes the characterization of heat reservoir thickness: for completed wells, the heat reservoir thickness is divided by the logging curve characteristics, and the rhythmic type of the heat reservoir section is obtained in combination with the curve morphology; for heat reservoirs between wells, the waveform characteristic changes of three-dimensional seismic data are used for comparative prediction.

[0013] Furthermore, the rhythm types include positive rhythm, negative rhythm and compound rhythm.

[0014] Furthermore, the heat reservoir distribution law also includes a description of the heterogeneity of the heat reservoir section. Combined with the rhythmic characteristics of the heat reservoir section, core calibration logging is performed to obtain the law of physical property changes of the heat reservoir section from shallow to deep.

[0015] Furthermore, the step S102, designing the injection and extraction well pattern of the high-angle wells according to the heat reservoir distribution law, specifically includes:

[0016] According to the influence of reservoir heterogeneity in the heat reservoir section and the difference in permeability between the upper and lower parts of the main heat reservoir on the injection of high-angle wells, combined with the difference in permeability between the upper and lower parts of the heat reservoir, the differential well spacing for achieving uniform injection is obtained.

[0017] Furthermore, in the differential well spacing, the injection well spacing in the upper high permeability section is 350 to 380 m, and the injection well spacing in the lower low permeability section is 250 to 280 m.

[0018] Furthermore, the step S103, optimizing the spatial position of the high-angle well extraction and injection well network, specifically includes:

[0019] According to the mutual influence of the spacing of water wells with different high deviation angles, the analytical formula of the spacing of high deviation wells is obtained.

[0020] Furthermore, the analytical formula for the well spacing of the highly deviated well is:

[0021]

[0022] Where f is the well pattern density, wells / km 2 ; N represents the geological reserves of thermal energy, 10 4 t; a is the coefficient related to the physical properties of formation water and thermal storage, 0.153; b is the average total investment per well, 10 4 Yuan / mouth; B is the economic calculation of geothermal development, Yuan / cubic meter; A is the thermal storage area, km 2 ; E D For oil recovery efficiency.

[0023] Furthermore, it also includes establishing geological models with different horizontal and vertical well spacings, applying numerical simulation methods to predict, and selecting the best design parameters.

[0024] The present invention also provides a thick-layer heat storage high-angle well extraction and injection development system, the system comprising: a determination unit, a design unit and an optimization unit; wherein,

[0025] Determine the units for conducting thick-layer heat storage and heterogeneity evaluation research and determining the distribution law of heat storage;

[0026] Design unit, used to design the well network for high-angle wells according to the distribution law of heat reservoir;

[0027] The optimization unit is used to optimize the spatial position of the high-angle well extraction and injection well network.

[0028] Furthermore, the determining unit is specifically configured to:

[0029] The stratigraphic framework and fault characteristics of the regional heat reservoir section are obtained by combining well data and seismic data. The thickness of the heat reservoir at the completed drilling position is obtained through well data, and the occurrence of heat reservoirs between wells is obtained by combining seismic data. The distribution law of heat reservoirs is described by the change law of seismic waveforms. Based on the well logging and mud recording data, the heterogeneity of the reservoir section is described, and the differences between heat reservoir sections at different positions in the section are characterized.

[0030] Furthermore, the design unit is specifically used for:

[0031] According to the influence of reservoir heterogeneity in the heat reservoir section and the difference in permeability between the upper and lower parts of the main heat reservoir on the injection of high-angle wells, combined with the difference in permeability between the upper and lower parts of the heat reservoir, differential well spacing is adopted to obtain differential well spacing that can achieve uniform injection.

[0032] Furthermore, the optimization unit is specifically used for:

[0033] According to the mutual influence of the spacing of water wells with different high deviation angles, the analytical formula of the spacing of high deviation wells is optimized. At the same time, by establishing geological models of different well spacings in the plane and vertical direction, numerical simulation methods are used to predict and select the best design parameters.

[0034] In addition, the present invention also relates to a computer-readable storage medium, which stores computer instructions, and the computer instructions are used to implement the above-mentioned thick-layer thermal storage high-angle well extraction and injection development method when executed by a processor.

[0035] The present invention also relates to an electronic device, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned method for extracting and injecting a thick-layer thermal reservoir with a high-angle well when executing the computer program.

[0036] Technical effects and advantages of the present invention:

[0037] This method is used to develop the thick-layer heat reservoir in the third section of the Shahejie Formation in the Shuguang Base. The high-angle wells are used as injection wells because of their large contact area with the heat reservoir section. By establishing a thick-layer heat reservoir high-angle well injection development model, the injection effect of the thick-layer heat reservoir can be greatly improved, and the problem of low water extraction intensity and re-injection intensity of conventional vertical wells can be solved; it can also save geothermal wells and achieve the purpose of improving heat utilization, thereby establishing a new large-scale injection model.

[0038] Other features and advantages of the present invention will be described in the following description, and partly become obvious from the description, or be understood by implementing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A flow chart of a method for extracting and injecting a thick-layer thermal reservoir with a high-angle well according to an exemplary embodiment of the present invention;

[0040] Figure 2 It is a contour map of heat reservoir thickness of the third segment of the Shahejie Formation in the deployment area of ​​the F fault block according to an exemplary embodiment of the present invention;

[0041] Figure 3 It is a cross-sectional view of the heat storage of the third segment of the Shahejie Formation in the deployment area of ​​the F fault block according to an exemplary embodiment of the present invention;

[0042] Figure 4 It is a bar graph of the permeability of layer 5 of a typical well in block F according to an exemplary embodiment of the present invention;

[0043] Figure 5 This is a relatively homogeneous inter-segment rhythm diagram of the No. 5 layer in a typical well of the F fault block according to an exemplary embodiment of the present invention;

[0044] Figure 6 A schematic cross-sectional view of a design of a high-angle well extraction and irrigation network for a fault block F according to an exemplary embodiment of the present invention;

[0045] Figure 7 It is a schematic plan view of a design of a well network for high-angle wells in the F fault block according to an exemplary embodiment of the present invention;

[0046] Figure 8 It is a schematic diagram of the spatial position optimization of the F-block high-angle well extraction and injection well network according to an exemplary embodiment of the present invention;

[0047] Fig. 9 A schematic diagram of a thick-layer thermal reservoir high-angle well extraction and injection development system for an exemplary embodiment of the present invention. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] In order to solve the shortcomings of the prior art, the present invention specifically proposes a new means of geothermal development of the thick-layer heat reservoir in the third section of the Shahejie Formation in the Shuguang Base. High-angle wells are used as injection wells, which can greatly improve the injection effect. Three specific steps are adopted to complete the injection and development of geothermal high-angle wells. Figure 1 The flowchart of a method for extracting and injecting a thick-layer thermal reservoir with a high-angle well is shown in the following example. Figure 1 As shown, the method comprises the following steps:

[0050] Step S101, conducting thick-layer heat storage and heterogeneity evaluation research to determine the heat storage distribution law;

[0051] Step S102, designing a high-angle well extraction and injection well network according to the heat reservoir distribution law;

[0052] Step S103, optimizing the spatial position of the high-angle well extraction and irrigation network.

[0053] In step S101 of the present invention, the thick-layer heat storage and heterogeneity evaluation research is carried out to determine the heat storage distribution law, which specifically includes:

[0054] Through the combination of well and seismic data, the stratigraphic framework and fault characteristics of the regional thermal reservoir section are determined, the thermal reservoir thickness at the completed drilling position is determined through well data, the inter-well thermal reservoir occurrence is determined in combination with seismic data, and the thermal reservoir distribution law is described through the change law of seismic waveforms and the research method of deducing the unknown from the known; at the same time, relying on well logging and mud recording data, the heterogeneity of the reservoir section is described, the differences between thermal reservoir sections at different positions in the section are characterized, and the static foundation for geothermal development design is laid.

[0055] Specifically, the heterogeneity description includes: comprehensive analysis of reservoir properties of the thermal reservoir section to be developed, core calibration logging, drawing of permeability bar graphs at different locations, and on this basis, using the heterogeneity description method to classify and segment the thermal reservoirs, determine the permeability difference levels of different thermal reservoir sections, and lay the foundation for the next step of well network and well spacing design.

[0056] In step S102 of the present invention, the design of the injection and extraction well network of the highly deviated wells according to the heat reservoir distribution law specifically includes:

[0057] According to the influence of reservoir heterogeneity in the heat reservoir section and the difference in permeability between the upper and lower parts of the main heat reservoir on the injection of high-angle wells, compared with conventional vertical wells, injection of high-angle wells increases the contact area between the well and the heat reservoir section, which is conducive to more fluids entering the wellbore from the heat reservoir section and increasing the water extraction of a single well; when the difference in reinjection intensity is not large, it is conducive to the reinjection water entering the formation. To offset the influence of heat reservoir heterogeneity, due to the compaction of the formation, the permeability of the upper part is usually better than that of the lower part. Therefore, in the well spacing design, combined with the difference between the upper and lower parts of the heat reservoir section, differential well spacing is adopted to achieve the purpose of as uniform injection as possible. The well spacing is increased in the upper high permeability section, and the injection well spacing is 350-380m, and the well spacing is reduced in the lower low permeability section, and the injection well spacing is 250-280m.

[0058] In step S103 of the present invention, the spatial position of the high-angle well extraction and injection well network is optimized, specifically:

[0059] According to the mutual influence of the spacing of water wells with different high deviation angles, the analytical formula of the spacing of high deviation wells is optimized. At the same time, by establishing geological models of different well spacings in the plane and vertical direction, numerical simulation methods are used to predict and select the best design parameters.

[0060] Example:

[0061] Taking the F fault block geothermal development area as an example, it is adjacent to the S plant joint station and is structurally located on the western slope of the western depression of the Liaohe fault depression. The target layer of this geothermal study is the third section of the Shahe formation. After 20 years of development, the lower oil layer of this block has been exhausted and is in a state of being scrapped. The wells that have been completed in the early stage have confirmed that the upper Dalinghe oil layer has rich thermal storage resources and has development potential.

[0062] The present invention specifically proposes a new means for geothermal development of thick-layer heat reservoirs in the third section of the Shahejie Formation in the F fault block area. High-angle wells are used as injection wells, which can greatly improve the injection effect and achieve the purpose of improving heat utilization rate.

[0063] Step S101: Conduct thick-layer heat storage and heterogeneity evaluation research to determine the heat storage distribution pattern.

[0064] Conduct comprehensive geological research combining well and seismic data around the eastern part of the heating station to implement the distribution rules of heat reserves.

[0065] Figure 2 : is a thickness contour map of the heat reservoir in the third segment of the Shahejie Formation in the F block deployment area according to an exemplary embodiment of the present invention; Figure 2 As shown in Figure 2, the thickness of the regional available heat reservoir changes, so we try to deploy wells in the thick value area as much as possible during the deployment of wells. Figure 2 It can be seen that the regional thickness is thick in the south and thin in the north. The thinning in the north is due to the combined influence of sedimentation and large faults. Combined with the available platform location on the ground, the deployment position is optimized.

[0066] Figure 3 The heat storage cross section of the third segment of the Shahejie Formation in the F block deployment area of ​​the exemplary embodiment of the present invention is shown in FIG. Figure 3 As shown in Figure 1, from the well sections of the hot reservoir section in the drilling area, it can be seen that the variation pattern of the hot reservoir thickness and interlayer on the section. Figure 3 It can be seen that a complete set of thick blocky heat reservoirs are developed in the region. From the overall shape of the logging curve of the complete well 306, the heterogeneity is moderate, showing an approximate box-shaped feature. The total thickness of the heat reservoir is 500m, and the main layer No. 5 is above 220. From this reservoir thickness condition, it can be seen that the deployment of high-angle injection wells in the region has a good guarantee for the thickness of the heat reservoir encountered.

[0067] Reservoir heterogeneity refers to the uneven changes in the spatial distribution and various internal properties of the reservoir under the combined influence of sedimentation, diagenesis and later tectonic action. This uneven change is specifically manifested in the heterogeneity of internal attribute characteristics such as reservoir lithology, physical properties and microscopic pore structure and the spatial distribution of the reservoir. The heterogeneity of thermal reservoirs has a great influence on geothermal injection and seepage. Heterogeneity affects the underground seepage law of reinjection water and the thermal utilization rate. Thick-layer thermal reservoirs are not a homogeneous body. There may be several sedimentary periods inside them, and the permeability of each period is different. At the same time, due to different burial depths, differential compaction will occur.

[0068] Figure 4 : is a bar graph of the permeability of layer 5 in a typical well of block F according to an exemplary embodiment of the present invention; Figure 4 As shown in the figure, this figure is the permeability distribution of the layer calculated by the secondary interpretation of well logging. Figure 4 It can be seen from the figure that the entire thick layer has a certain degree of heterogeneity and presents multiple rhythms. On the whole, the permeability is high in the upper part of the thick layer, and the permeability is low in the lower part of the thick layer. This distribution characteristic will lead to better production in the upper part of the layer and poor production in the lower part during conventional vertical well production. Therefore, this figure also illustrates the necessity of deploying high-angle injection wells.

[0069] Figure 5 This is a relatively homogeneous inter-segment rhythm diagram of the No. 5 layer in a typical well of the F fault block according to an exemplary embodiment of the present invention. Figure 5 As shown, the figure is Figure 4 The rhythmic segment statistics are combined to make statistics of the layers with relatively consistent permeability. Figure 4 and Figure 5 According to the analysis conclusion, the permeability of the upper thick layer is about 270mD, and the permeability of the lower thick layer is about 90mD. The permeability range of the entire thick layer is 2-3. That is to say, if conventional vertical well injection is carried out, the injection capacity of the upper section is expected to be twice that of the lower section. Therefore, it is necessary to optimize the injection well spacing to achieve uniform vertical utilization of the heat reservoir.

[0070] The thickness of the sandstone in the No. 5 layer of Well 306 is 226m. Five relatively homogeneous rhythmic segments can be seen in the layer. The rhythmic characteristics are obvious in each rhythmic segment, mainly showing an inverse composite rhythmic feature with the permeability increasing from small to large and then to small from bottom to top, or an upper and lower combination of inverse composite rhythm and positive rhythm.

[0071] Step S102: designing a high-angle well extraction and injection network according to the heat reservoir distribution law.

[0072] Figure 6 FIG. 1 is a schematic cross-sectional view of a design of a high-angle well extraction and irrigation network for a fault block F according to an exemplary embodiment of the present invention. Figure 6 As shown in the figure, in the process of geothermal development of a thick thermal reservoir, if a high-angle well is deployed, the drilling engineering design optimization of the two wells at different depths can be fully utilized to expand the well spacing in the area with relatively high permeability and reduce the well spacing in the area with relatively low permeability, thereby compensating for the impact of the heterogeneity of the thermal reservoir. At the same time, the method of top injection and bottom extraction is adopted to make full use of gravity to improve the reinjection effect.

[0073] Figure 7 FIG. 1 is a schematic plan view of a design of a high-angle well extraction and injection well network for a fault block F according to an exemplary embodiment of the present invention. Figure 7 As shown in the figure, the geothermal resources in the thick-layer heat reservoir development area are rich. It is necessary to deploy multiple groups of wells for extraction and injection. In the process of high-angle extraction and injection deployment, the ground platform position is optimized. While ensuring the extraction and injection development effect of a single well group, it is ensured that the well groups do not affect each other. The distance design between the well groups is fully combined with the existing numerical simulation results. The distance between the well groups in the figure is more than 500m.

[0074] Consider the impact of reservoir heterogeneity in the heat reservoir section and the difference in permeability between the upper and lower parts of the main heat reservoir on the extraction and injection of high-angle wells. The overall well network for extraction and injection of high-angle wells adopts the method of upper injection and lower extraction. The high-angle wells for reinjection are deployed as far as possible in the high parts of the structure, which is conducive to the migration of reinjection water to the lower high-angle wells for water extraction under the action of gravity. At the same time, the well spacing in the upper high-permeability section is increased, and the well spacing for extraction and injection is 350-380m, while the well spacing in the lower low-permeability section is reduced, and the well spacing for extraction and injection is 250-280m, so as to achieve uniform utilization of different permeability layers in the upper and lower parts of the heat reservoir.

[0075] Step S103, optimizing the spatial position of the high-angle well extraction and irrigation network.

[0076] The inclination angle of geothermal high-angle wells is mainly affected by the platform location, process and geological conditions. Combined with the sand body distribution characteristics and platform location in the example area, it is calculated that the implementable high-angle section angle is 60-70°, and the heat reservoir thickness encountered by high-angle wells is 900-1100m.

[0077] Figure 8 FIG. 1 is a schematic diagram of the spatial position optimization of the F-block high-angle well extraction and injection well network according to an exemplary embodiment of the present invention. Figure 8 As shown, it is Figure 7 On this basis, the design schematic diagram of optimizing the platform position is carried out. The construction of a large irrigation platform can greatly reduce ground investment and save development and construction costs.

[0078] Taking into account the mutual influence of the well spacing of different highly deviated water wells, the present invention optimizes the analytical formula of the well spacing of highly deviated wells, and obtains the following formula after transforming the Shelkachev formula:

[0079]

[0080] Where f represents the well pattern density, wells / km 2 N represents the geological reserves of thermal energy, 10 4 t; a is related to the physical properties of formation water and thermal storage, 0.153; b represents the average total investment per well, 10 4 Yuan / mouth; B represents geothermal development economic calculation, Yuan / cubic meter; A represents thermal storage area, km 2 ; E D Indicates oil displacement efficiency.

[0081] At the same time, by establishing geological models with different well spacings in the plane and vertical direction, numerical simulation methods are used to predict, mainly looking at the well spacing and the temperature changes of thermal reservoir development, and selecting the best design parameters. The numerical simulation results show that when the vertical horizontal section distance is greater than 300m, there is no obvious interference between wells.

[0082] In addition, the present invention also provides a thick-layer heat storage high-angle well extraction and injection development system. Fig. 9 FIG. 1 is a schematic diagram of a thick-layer heat storage high-angle well extraction and injection development system according to an exemplary embodiment of the present invention. Fig. 9 As shown, the system includes: a determination unit 11, a design unit 12 and an optimization unit 13; wherein the determination unit 11 is used to carry out thick-layer heat storage and heterogeneity evaluation research and determine the heat storage distribution law; the design unit 12 is used to design a high-angle well extraction and injection well network according to the heat storage distribution law; the optimization unit 13 is used to optimize the spatial position of the high-angle well extraction and injection well network.

[0083] Furthermore, the determination unit 11 is specifically used for: obtaining the stratigraphic framework and fault characteristics of the regional heat reservoir section by combining well data and seismic data, obtaining the heat reservoir thickness at the completed drilling position by combining well data, obtaining the inter-well heat reservoir occurrence by combining seismic data, and describing the heat reservoir distribution law by the change law of seismic waveform; carrying out the description of reservoir section heterogeneity according to the well logging and mud recording data, and describing the differences of heat reservoir sections at different positions in the section.

[0084] Furthermore, the design unit 12 is specifically used to: according to the influence of reservoir heterogeneity of the heat reservoir section and the difference in permeability between the upper and lower parts of the main heat reservoir on the injection of high-angle wells, combined with the difference in permeability between the upper and lower parts of the heat reservoir, adopt differential well spacing to obtain differential well spacing that can achieve uniform injection.

[0085] Furthermore, the optimization unit 13 is specifically used to optimize the analytical formula for the spacing of highly inclined wells according to the mutual influence of the spacing of different highly inclined water wells, and at the same time, by establishing geological models of different well spacings in the plane and vertical direction, applying numerical simulation methods to predict and select the best design parameters.

[0086] The present invention also provides a computer-readable storage medium, which stores computer instructions, and the computer instructions are used to enable a processor to implement the above-mentioned method for extracting and injecting thick-layer thermal energy storage and highly deviated wells when executed.

[0087] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the method for extracting and injecting a thick-layer thermal reservoir with a high-angle well as described above is implemented.

[0088] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for extracting and developing thick-layer heat storage with high-angle wells, characterized in that: The method comprises the following steps: Step S101, conducting thick-layer heat storage and heterogeneity evaluation research to determine the heat storage distribution law; Step S102, designing a high-angle well extraction and injection well network according to the heat reservoir distribution law; Step S103, optimizing the spatial position of the high-angle well extraction and irrigation network.

2. A method for extracting and developing thick-layer heat storage with high-angle wells according to claim 1, characterized in that: The step S101, conducting thick-layer heat storage and heterogeneity evaluation research to determine the heat storage distribution law, specifically includes: The stratigraphic framework and fault characteristics of the regional heat reservoir section are obtained by combining well data and seismic data. The thickness of the heat reservoir at the completed drilling position is obtained through well data, and the occurrence of heat reservoirs between wells is obtained by combining seismic data. The distribution law of heat reservoirs is described by the change law of seismic waveforms. Based on the well logging and mud recording data, the heterogeneity of the reservoir section is described, and the differences between heat reservoir sections at different positions in the section are characterized.

3. A method for extracting and developing thick-layer heat storage with high-angle wells according to claim 2, characterized in that: The heterogeneity description includes: A comprehensive analysis of the reservoir properties of the proposed thermal reservoir section is conducted, core calibration logging is performed, permeability bar graphs at different locations are drawn, and the thermal reservoir is classified and segmented using the heterogeneity description method to determine the permeability difference level of different thermal reservoir sections.

4. A method for extracting and developing thick-layer heat storage with high-angle wells according to any one of claims 1 to 3, characterized in that: The heat reservoir distribution law includes the characterization of heat reservoir thickness: for completed wells, the heat reservoir thickness is divided by the logging curve characteristics, and the rhythm type of the heat reservoir section is obtained in combination with the curve shape; for heat reservoirs between wells, the waveform characteristic changes of three-dimensional seismic data are used for comparative prediction.

5. A method for extracting and developing thick-layer heat storage with high-angle wells according to claim 4, characterized in that: The rhythm types include positive rhythm, negative rhythm and compound rhythm.

6. A method for extracting and developing thick-layer heat storage with high-angle wells according to any one of claims 1 to 3, characterized in that: The heat reservoir distribution law also includes the description of the heterogeneity of the heat reservoir section. In combination with the rhythmic characteristics of the heat reservoir section, core calibration logging is performed to obtain the law of physical property changes of the heat reservoir section from shallow to deep.

7. The method for extracting and developing thick-layer heat storage with high-angle wells according to claim 1 is characterized in that: The step S102, designing a well network for high-angle well extraction and injection according to the heat reservoir distribution law, specifically includes: According to the influence of reservoir heterogeneity in the heat reservoir section and the difference in permeability between the upper and lower parts of the main heat reservoir on the injection of high-angle wells, combined with the difference in permeability between the upper and lower parts of the heat reservoir, the differential well spacing for achieving uniform injection is obtained.

8. A method for extracting and developing thick-layer heat storage with high-angle wells according to claim 7, characterized in that: Among the differential well spacings, the well spacing for injection in the upper high permeability section is 350 to 380 m, and the well spacing for injection in the lower low permeability section is 250 to 280 m.

9. The method for extracting and developing thick-layer heat storage with high-angle wells according to claim 1 is characterized in that: The step S103, optimizing the spatial position of the high-angle well extraction and injection well network, specifically includes: According to the mutual influence of the spacing of water wells with different high deviation angles, the analytical formula of the spacing of high deviation wells is obtained.

10. A method for extracting and developing thick-layer heat storage with high-angle wells according to claim 9, characterized in that: The analytical formula for the well spacing of the highly deviated well is: Where f is the well pattern density, wells / km 2 ; N represents the geological reserves of thermal energy, 10 4 t; a is the coefficient related to the physical properties of formation water and thermal storage, 0.153; b is the average total investment per well, 10 4 Yuan / mouth; B is the economic calculation of geothermal development, Yuan / cubic meter; A is the thermal storage area, km 2 ; E D For oil recovery efficiency.

11. A method for extracting and developing thick-layer heat storage with high-angle wells according to claim 9, characterized in that: It also includes establishing geological models with different horizontal and vertical well spacings, applying numerical simulation methods to predict, and selecting the best design parameters.

12. A thick-layer heat storage high-angle well extraction and injection development system, characterized in that: The system comprises: a determination unit, a design unit and an optimization unit; wherein, Determine the units for conducting thick-layer heat storage and heterogeneity evaluation research and determining the distribution law of heat storage; Design unit, used to design the well network for high-angle wells according to the distribution law of heat reservoir; The optimization unit is used to optimize the spatial position of the high-angle well extraction and injection well network.

13. A thick-layer heat storage high-angle well extraction and irrigation development system according to claim 12, characterized in that: The determining unit is specifically used for: The stratigraphic framework and fault characteristics of the regional heat reservoir section are obtained by combining well data and seismic data. The thickness of the heat reservoir at the completed drilling position is obtained through well data, and the occurrence of heat reservoirs between wells is obtained by combining seismic data. The distribution law of heat reservoirs is described by the change law of seismic waveforms. Based on the well logging and mud recording data, the heterogeneity of the reservoir section is described, and the differences between heat reservoir sections at different positions in the section are characterized.

14. A thick-layer heat storage high-angle well extraction and irrigation development system according to claim 12, characterized in that: The design unit is specifically used for: According to the influence of reservoir heterogeneity in the heat reservoir section and the difference in permeability between the upper and lower parts of the main heat reservoir on the injection of high-angle wells, combined with the difference in permeability between the upper and lower parts of the heat reservoir, differential well spacing is adopted to obtain differential well spacing that can achieve uniform injection.

15. A thick-layer heat storage high-angle well extraction and irrigation development system according to claim 12, characterized in that: The optimization unit is specifically used for: According to the mutual influence of the spacing of water wells with different high deviation angles, the analytical formula of the spacing of high deviation wells is optimized. At the same time, by establishing geological models of different well spacings in the plane and vertical direction, numerical simulation methods are used to predict and select the best design parameters.

16. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement a method for extracting and injecting thick-layer thermal energy storage and highly deviated wells as described in any one of claims 1 to 11 when executed.

17. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, a method for extracting and injecting a thick-layer thermal reservoir with a high-angle well as described in any one of claims 1 to 11 is implemented.

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