A method and system for thick layer hot reservoir large inclination well injection development

Abstract

This invention discloses a method and system for developing thick geothermal reservoirs with highly deviated wells, relating to the field of geothermal development technology. The method includes: step S101, conducting evaluation studies on thick geothermal reservoirs and heterogeneity to determine the reservoir distribution pattern; step S102, designing a highly deviated well network for water extraction and reinjection based on the reservoir distribution pattern; and step S103, optimizing the spatial location of the highly deviated well network. This invention, by establishing a development model for thick geothermal reservoirs with highly deviated wells, can significantly improve the water extraction and reinjection effect of thick geothermal reservoirs, solving the problems of low water extraction and reinjection intensity in conventional vertical wells; it can also save geothermal well resources, achieving the goal of improving heat utilization, thereby establishing a new model for large-scale water extraction and reinjection.

Description

Technical Field

[0001] This invention relates to the field of geothermal development technology, and in particular to a method and system for the extraction and irrigation development of thick geothermal reservoirs with large deviated wells. Background Technology

[0002] In 2021, the "Shuguang Base Geothermal Utilization Project" passed the feasibility study, realizing geothermal substitution in the Shuguang area, and is planned to save a total of 186.6 × 10⁻⁶ natural gas. 4 m 3 / a, emission reduction of 5.75×10 4 At t / a, the geothermal development of the Sha-3 section in the F well area in the eastern part of the base has entered the planning stage. Preliminary pilot tests have confirmed the limited water extraction and reinjection capacity of conventional vertical wells. Dynamic evaluation of water extraction and reinjection at the Huansanlian site indicates that the maximum capacity of the extraction wells is 0.17–0.19 m³. 3 / hm(4.0~4.5m 3 / dm); the maximum capacity of the recharge well is 0.06~0.1m. 3 / hm(1.4~2.4m 3 / dm). The F well area has well-developed thermal reservoirs at the edge of the oilfield, with a thickness of 250-400m, which belongs to the thick thermal reservoir type. There are few completed wells in the well area and they have been abandoned. Based on previous studies, it is believed that the contact area between the high-angle well and the thermal reservoir section is large. As a well for extraction and injection, it can greatly improve the extraction and injection effect. Therefore, there is an urgent need to provide a development method for extraction and injection of high-angle wells in thick thermal reservoirs. Summary of the Invention

[0003] The purpose of this invention is to provide a method and system for the extraction and development of highly deviated wells in thick thermal reservoirs. This invention relies on detailed reservoir characterization research to significantly improve extraction and development efficiency. To achieve the above objective, this invention provides the following technical solution:

[0004] This invention provides a method for the extraction and development of highly deviated wells in thick thermal reservoirs, the method comprising the following steps:

[0005] Step S101: Conduct evaluation studies on thick thermal reservoirs and heterogeneity to determine the distribution patterns of thermal reservoirs;

[0006] Step S102: Design the injection and drainage well pattern for highly deviated wells based on the distribution pattern of the thermal reservoir;

[0007] Step S103: Optimize the spatial location of the irrigation well network for highly deviated wells.

[0008] Further, step S101, conducting evaluation studies on thick-layer thermal reservoirs and heterogeneity to determine the distribution patterns of thermal reservoirs, specifically includes:

[0009] By combining well and seismic data, the stratigraphic framework and fault characteristics of the regional geothermal reservoir are obtained. The thickness of the geothermal reservoir at the completed drilling location is obtained through well data. The occurrence of the geothermal reservoir between wells is obtained by combining seismic data. The distribution pattern of the geothermal reservoir is described by the variation pattern of the seismic waveform. Based on well logging and well logging data, the heterogeneity of the reservoir section is described, and the differences of geothermal reservoir sections at different locations within the section are characterized.

[0010] Furthermore, the description of heterogeneity includes:

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

[0012] Furthermore, the distribution pattern of the thermal reservoir includes the characterization of the reservoir thickness: for completed wells, the reservoir thickness is divided by the characteristics of the logging curves, and the rhythm type of the reservoir section is obtained by combining the curve morphology; for inter-well thermal reservoirs, the waveform characteristics of the three-dimensional seismic data are used for comparative prediction.

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

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

[0015] Furthermore, step S102, designing the injection and drainage well pattern for highly deviated wells based on the distribution pattern of the thermal reservoir, specifically includes:

[0016] Based on the impact of reservoir heterogeneity and the permeability difference between the upper and lower parts of the main thermal reservoir on well extraction and injection at high deviated angles, and combined with the permeability difference between the upper and lower parts of the thermal reservoir, a differential well spacing that can achieve uniform extraction and injection is obtained.

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

[0018] Furthermore, step S103, optimizing the spatial location of the irrigation well network for highly deviated wells, specifically includes:

[0019] Based on the mutual influence of well spacing for water intake with different steep inclinations, an analytical formula for well spacing for steep inclinations is obtained.

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

[0021]

[0022] In the formula, f is the well network density, in wells per km. 2 N represents the geological reserves of the geothermal reservoir, 10 4 t; a is the correlation coefficient with formation water properties and thermal reservoir properties, 0.153; b is the average total investment per well, 10 4 Yuan / unit; B represents the economic calculation for geothermal development, Yuan / cubic meter; A represents the geothermal storage area, km². 2 E D For oil displacement efficiency.

[0023] Furthermore, it also includes establishing geological models with different well spacings in the plane and vertical direction, applying numerical simulation methods to predict and select the optimal design parameters.

[0024] This invention also provides a development system for highly deviated wells in thick thermal reservoirs, the system comprising: a determination unit, a design unit, and an optimization unit; wherein,

[0025] The unit is defined to conduct evaluation studies on thick thermal reservoirs and heterogeneity, and to determine the distribution pattern of thermal reservoirs;

[0026] The design unit is used to design the injection and drainage well pattern of highly deviated wells based on the distribution pattern of thermal reservoirs.

[0027] The optimization unit is used to optimize the spatial location of the injection and drainage well network for highly deviated wells.

[0028] Furthermore, the determining unit is specifically used for:

[0029] By combining well and seismic data, the stratigraphic framework and fault characteristics of the regional geothermal reservoir are obtained. The thickness of the geothermal reservoir at the completed drilling location is obtained through well data. The occurrence of the geothermal reservoir between wells is obtained by combining seismic data. The distribution pattern of the geothermal reservoir is described by the variation pattern of the seismic waveform. Based on well logging and well logging data, the heterogeneity of the reservoir section is described, and the differences of geothermal reservoir sections at different locations within the section are characterized.

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

[0031] Based on the impact of reservoir heterogeneity and the difference in permeability between the upper and lower parts of the main reservoir on well extraction and injection at high angles, and taking into account the difference in permeability between the upper and lower parts of the reservoir, a differential well spacing is adopted to obtain a differential well spacing that can achieve uniform extraction and injection.

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

[0033] Based on the mutual influence of well spacing for water intake with different steep inclinations, the analytical formula for well spacing for steep inclinations is optimized. At the same time, by establishing geological models with different well spacings in the plane and vertical direction, numerical simulation methods are applied to predict and select the optimal design parameters.

[0034] In addition, the present invention also relates to a computer-readable storage medium storing computer instructions for causing a processor to execute the above-described method for the extraction and injection development of a thick thermal reservoir with a high deviation.

[0035] The present invention also relates to an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the above-described method for extraction and irrigation development of a thick thermal reservoir with a high deviation.

[0036] The technical effects and advantages of this invention are as follows:

[0037] This method is used for the geothermal development of the thick geothermal reservoir in the Sha-3 section of the Shuguang base. Due to the large contact area with the reservoir, the high-angle wells can be used as injection and extraction wells. By establishing a high-angle well injection and extraction development model for thick geothermal reservoirs, the injection and extraction effect of thick geothermal reservoirs can be greatly improved, solving the problem of low water extraction intensity and reinjection intensity of conventional vertical wells. It can also save geothermal well materials and improve the heat utilization rate, thereby establishing a new model for large-scale injection and extraction.

[0038] 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 pointed out in the description and the drawings. Attached Figure Description

[0039] Figure 1 A flowchart illustrating a method for extraction and irrigation development of a thick thermal reservoir with a high deviation, as an exemplary embodiment of the present invention;

[0040] Figure 2 An isometric map of the thickness of the three-section thermal reservoir in the F-block deployment area of ​​the present invention, which is an exemplary embodiment of the present invention.

[0041] Figure 3 A cross-sectional view of the Sha-3 section geothermal reservoir in the F-block deployment area, which is an exemplary embodiment of the present invention;

[0042] Figure 4 A bar chart of permeability of layer 5 in a typical well of the F-block as an exemplary embodiment of the present invention;

[0043] Figure 5 A rhythm diagram of relatively homogeneous segments within layer 5 of a typical well in the F-block, which is an exemplary embodiment of the present invention;

[0044] Figure 6 A schematic cross-sectional view of the well network design for high-angle wells in the F-block, which is an exemplary embodiment of the present invention;

[0045] Figure 7 A schematic diagram of the design plan of the injection and drainage well network for the F-block with high deflection, which is an exemplary embodiment of the present invention;

[0046] Figure 8 A schematic diagram illustrating the spatial location optimization of the irrigation and drainage network for high-angle wells in the F-block, which is an exemplary embodiment of the present invention;

[0047] Figure 9 This is a schematic diagram of a thick thermal reservoir high-angle well extraction and irrigation development system, which is an exemplary embodiment of the present invention. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] To address the shortcomings of existing technologies, this invention proposes a new method for developing thick geothermal reservoirs in the Sha-3 section of the Shuguang base. Using highly deviated wells as extraction and irrigation wells can significantly improve the extraction and irrigation effect. Three specific steps are used to complete the extraction and irrigation development of geothermal wells with high deviation. Figure 1 A flowchart illustrating a method for developing a thick thermal reservoir with a high deviated well, as an exemplary embodiment of the present invention, is shown below. Figure 1 As shown, the method includes the following steps:

[0050] Step S101: Conduct evaluation studies on thick thermal reservoirs and heterogeneity to determine the distribution patterns of thermal reservoirs;

[0051] Step S102: Design the injection and drainage well pattern for highly deviated wells based on the distribution pattern of the thermal reservoir;

[0052] Step S103: Optimize the spatial location of the irrigation well network for highly deviated wells.

[0053] In step S101 of this invention, the step of conducting evaluation studies on thick thermal reservoirs and heterogeneity to determine the distribution patterns of thermal reservoirs specifically includes:

[0054] By combining well and seismic methods, the stratigraphic framework and fault characteristics of regional geothermal reservoirs are determined. Well data is used to determine the thickness of geothermal reservoirs at completed drilling locations, and seismic data is used to determine the geothermal reservoir occurrence between wells. Furthermore, by studying the variation patterns of seismic waveforms and using known data to extrapolate the unknown, the distribution patterns of geothermal reservoirs are described. At the same time, based on well logging and well logging data, the heterogeneity of reservoir sections is described, the differences between geothermal reservoir sections at different locations within the section are depicted, and a static foundation for geothermal development design is laid.

[0055] Specifically, the heterogeneity description includes: a comprehensive analysis of the reservoir properties of the proposed geothermal reservoir section, core calibration logging, drawing permeability bar charts at different locations, and on this basis, using heterogeneity description methods to classify and segment the geothermal reservoir, determine the permeability difference level of different geothermal reservoir sections, and lay the foundation for the next step of well pattern and well spacing design.

[0056] In step S102 of the present invention, the design of the injection and drainage well network for highly deviated wells based on the distribution law of thermal reservoirs specifically includes:

[0057] Based on the impact of reservoir heterogeneity and permeability differences between the upper and lower parts of the main reservoir on water extraction and injection in highly deviated wells, water extraction and injection in highly deviated wells, compared to conventional vertical wells, increases the contact area between the well and the reservoir, facilitating more fluid entry from the reservoir into the wellbore and increasing water production per well. When the difference in reinjection intensity is not significant, it also facilitates the entry of reinjection water into the formation. To offset the effects of reservoir heterogeneity, due to formation compaction, permeability is generally better in the upper part than in the lower part. Therefore, in well spacing design, a differential well spacing is adopted, taking into account the differences between the upper and lower parts of the reservoir, to achieve the goal of as uniformly as possible water extraction and injection. The well spacing is increased in the upper high-permeability section, with a water extraction and injection well spacing of 350–380 m, while the well spacing is reduced in the lower low-permeability section, with a water extraction and injection well spacing of 250–280 m.

[0058] In step S103 of the present invention, the optimization of the spatial location of the irrigation network for highly deviated wells specifically includes:

[0059] Based on the mutual influence of well spacing for water intake with different steep inclinations, the analytical formula for well spacing for steep inclinations is optimized. At the same time, by establishing geological models with different well spacings in the plane and vertical direction, numerical simulation methods are applied to predict and select the optimal 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 structurally located on the western slope of the western depression of the Liaohe fault depression. The target layer for this geothermal study is the Sha-3 Member stratum. The lower oil layer of this block has been depleted after 20 years of development and is in a state of waiting to be abandoned. Previous drilling has confirmed that the upper Dalinghe oil layer has abundant geothermal resources and development potential.

[0062] This invention proposes a new method for geothermal development of thick geothermal reservoirs in the Sha-3 section of the F fault block area. Using highly deviated wells as extraction and injection wells can significantly improve the extraction and injection effect and achieve the goal of improving heat utilization.

[0063] Step S101: Conduct research on thick thermal reservoirs and heterogeneity evaluation to determine the distribution pattern of thermal reservoirs.

[0064] Conduct comprehensive geological research combining well and seismic studies in the eastern part of the heating station to determine the distribution patterns of the thermal reservoir.

[0065] Figure 2 An isometric map of the thickness of the Sha-3 section thermal reservoir in the F-block deployment area, as an exemplary embodiment of the present invention; as shown. Figure 2 As shown, the thickness variation of the available thermal reservoir in the region is observed. Therefore, during the deployment of injection and extraction wells, we try to deploy wells in areas with high thickness values. Furthermore, from... Figure 2 It can be seen that the thickness of the region is thicker in the south and thinner in the north. The thinning in the north is due to the combined effects of sedimentation and major faults. Based on the location of available platforms on the ground, the deployment location should be optimized.

[0066] Figure 3 A cross-sectional view of the Sha-3 section geothermal reservoir in the F-block deployment area, which is an exemplary embodiment of the present invention, is shown below. Figure 3 As shown, the variation patterns of reservoir thickness and interlayers can be observed in the completed well profiles of the drilled sections within the geothermal reservoir area. Furthermore, from... Figure 3 It can be seen that the region has developed a complete set of thick blocky thermal reservoirs. Judging from the overall shape of the logging curve of the 306 well, the heterogeneity is moderate, and it presents an approximately box-shaped feature. The total thickness of the thermal reservoir is 500m, and the main layer No. 5 is above 220m. Based on this reservoir thickness condition, it can be seen that the deployment of large-angle injection and extraction wells in the region has a good guarantee of the thickness of the thermal reservoir encountered during drilling.

[0067] Reservoir heterogeneity refers to the uneven spatial distribution and internal properties of a geothermal reservoir under the combined influence of sedimentation, diagenesis, and subsequent tectonic activity. This unevenness manifests specifically in the inhomogeneity of internal properties such as lithology, physical properties, and microstructure, as well as the spatial distribution of the reservoir. Geothermal reservoir heterogeneity significantly impacts geothermal extraction and recharge flow, affecting the groundwater seepage patterns and heat utilization efficiency of recharge water. Thick geothermal reservoirs are not homogeneous; they may contain several depositional phases, each with varying permeability. Furthermore, differences in burial depth lead to differential compaction.

[0068] Figure 4 A bar chart of permeability in layer 5 of a typical well in the F-block as an exemplary embodiment of the present invention; as shown. Figure 4 As shown, this figure illustrates the rod-shaped distribution of permeability in the formation calculated through secondary interpretation of well logging data. Furthermore, from... Figure 4 As can be seen from the figure, the entire thick layer exhibits a certain degree of heterogeneity, displaying multiple rhythms. Overall, the permeability is high in the upper part of the thick layer and relatively low in the lower part. This distribution characteristic leads to better utilization in the upper part of the layer and poorer utilization in the lower part during conventional vertical well drilling. Therefore, this figure also illustrates the necessity of deploying wells with high deviated angles for injection and drainage.

[0069] Figure 5 A rhythmic diagram of relatively homogeneous segments within layer 5 of a typical well in the F-block, as an exemplary embodiment of the present invention, is shown below. Figure 5 As shown, this figure is Figure 4 The statistics of rhythmic segments were analyzed, and segments with relatively consistent penetration rates were grouped together for statistical analysis. Furthermore, combined with... Figure 4 and Figure 5 Based on the analysis, the permeability of the upper part of the thick layer is about 270 mD, and the permeability of the lower part of the thick layer is about 90 mD. The permeability difference of the entire thick layer is 2 to 3. In other words, if conventional vertical well extraction and injection are carried out, the extraction and injection capacity of the upper section is expected to be twice that of the lower section. Therefore, it is necessary to optimize the well spacing to achieve uniform vertical utilization of the thermal reservoir.

[0070] The No. 5 sandstone layer in Well 306 is 226m thick. Five relatively homogeneous rhythmic segments can be seen within the layer. Each rhythmic segment has obvious rhythmic characteristics. It mainly presents a reverse composite rhythmic characteristic with permeability increasing and decreasing from bottom to top, or a combination of reverse composite rhythm and positive rhythm.

[0071] Step S102: Design the injection well pattern for highly deviated wells based on the distribution pattern of the thermal reservoir.

[0072] Figure 6 A schematic cross-sectional view of the well irrigation network design for the F-block with high deviation, as an exemplary embodiment of the present invention, is shown below. Figure 6 As shown, in the geothermal development of a thick geothermal reservoir, if a highly deviated well deployment is adopted, the drilling engineering design optimization of the two wells at different depths can be fully utilized to increase the well spacing in areas with relatively high permeability and decrease the well spacing in areas with relatively low permeability, thereby compensating for the impact of differences in reservoir heterogeneity. Simultaneously, the top-injection and bottom-extraction method can be adopted to fully utilize gravity and improve reinjection efficiency.

[0073] Figure 7 A schematic diagram of the well network design for high-angle wells in the F-block of the present invention is shown below, as an exemplary embodiment of the present invention. Figure 7 As shown, the region has abundant geothermal resources in its thick geothermal reservoir development area. Multiple well groups need to be deployed, and the deployment process at steep angles requires optimized design based on the location of the surface platform. This ensures the effectiveness of individual well groups while preventing interference between them. The spacing between well groups is designed based on existing numerical simulation results, with a spacing of over 500m as shown in the figure.

[0074] The heterogeneity of the geothermal reservoir and the permeability differences between the upper and lower parts of the main geothermal reservoir affect the injection and extraction of highly deviated wells. The overall injection and extraction well network for highly deviated wells adopts an upper injection and lower extraction approach. Reinjection wells are deployed as much as possible in structurally high locations to facilitate the migration of reinjection water to the lower extraction wells under gravity. Simultaneously, the well spacing is increased in the upper high-permeability section (350–380 m), while the well spacing is reduced in the lower low-permeability section (250–280 m), thus achieving uniform utilization of different permeability sections within the geothermal reservoir.

[0075] Step S103: Optimize the spatial location of the irrigation well network for highly deviated wells.

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

[0077] Figure 8 This is a schematic diagram illustrating the spatial location optimization of the irrigation network for highly deviated wells in the F-block, an exemplary embodiment of the present invention. Figure 8 As shown, it is Figure 7 Based on this, the design diagram optimizes the platform location, and the construction of the large irrigation platform can significantly reduce ground investment and save development and construction costs.

[0078] Taking into account the mutual influence of well spacing for water intakes with different steep inclinations, this invention optimizes the analytical formula for well spacing for steep inclinations. The following formula is derived by transforming the Serkachev formula:

[0079]

[0080] In the formula, f represents the well network density, in wells per km. 2 N represents the geological reserves of the geothermal reservoir, 10 4 t; a is the correlation coefficient with formation water properties and thermal reservoir properties, 0.153; b represents the average total investment per well, 10 4 Yuan / cubic meter; B represents the economic calculation of geothermal development, Yuan / cubic meter; A represents the geothermal storage area, km². 2 E D Indicates oil displacement efficiency.

[0081] Simultaneously, by establishing geological models with different well spacings in both horizontal and vertical directions, numerical simulation methods were applied to predict and select optimal design parameters, primarily focusing on the relationship between well spacing and geothermal reservoir development temperature. The simulation results show that once the horizontal distance in the vertical section exceeds 300m, there is no significant interference between wells.

[0082] In addition, the present invention also provides a development system for highly deviated wells in thick thermal reservoirs. Figure 9 A schematic diagram of a thick thermal reservoir high-angle well extraction and irrigation development system, as an exemplary embodiment of the present invention, is shown below. Figure 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 conduct research on thick thermal reservoirs and heterogeneity evaluation, and determine the distribution law of thermal reservoirs; the design unit 12 is used to design the well pattern for injection and extraction of highly deviated wells according to the distribution law of thermal reservoirs; and the optimization unit 13 is used to optimize the spatial location of the well pattern for injection and extraction of highly deviated wells.

[0083] Furthermore, the determining unit 11 is specifically used for: obtaining the stratigraphic framework and fracture characteristics of the regional geothermal reservoir through well-seismic combination; obtaining the geothermal reservoir thickness at the completed drilling location through well data; obtaining the geothermal reservoir occurrence between wells by combining seismic data; describing the geothermal reservoir distribution pattern through the variation law of seismic waveforms; and carrying out the description of reservoir heterogeneity based on well logging and well logging data to characterize the differences of geothermal reservoirs at different locations within the formation.

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

[0085] Furthermore, the optimization unit 13 is specifically used to: optimize the analytical formula for well spacing of large-angle wells based on the mutual influence caused by the well spacing of different large-angle wells, and at the same time, by establishing geological models of different well spacings in the plane and longitudinal direction, apply numerical simulation methods to predict and select the best design parameters.

[0086] The present invention also provides a computer-readable storage medium storing computer instructions for causing a processor to execute and implement the above-described method for the extraction and injection development of a thick thermal reservoir with a high deviated well.

[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 the processor executes the computer program to implement the above-described method for the extraction and irrigation development of a thick thermal reservoir with a high deviation.

[0088] Finally, it should be noted that the above description 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 foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for developing and extracting water from a highly deviated well in a thick thermal reservoir, characterized in that, The method includes the following steps: Step S101: Conduct evaluation studies on thick thermal reservoirs and heterogeneity to determine the distribution patterns of thermal reservoirs; Step S102: Design the injection and drainage well pattern for highly deviated wells based on the distribution pattern of the thermal reservoir; Step S103: Optimize the spatial location of the injection well network for highly deviated wells; Step S102, designing the injection well pattern for highly deviated wells based on the distribution pattern of thermal reservoirs, specifically includes: Based on the heterogeneity of the reservoir and the impact of the permeability difference between the upper and lower parts of the main reservoir on the extraction and injection of highly deviated wells, and combined with the permeability difference between the upper and lower parts of the reservoir, the differential well spacing that can achieve uniform extraction and injection is obtained. In areas with relatively high permeability, the well spacing is increased, while in areas with relatively low permeability, the well spacing is decreased, thereby compensating for the impact of differences in the heterogeneity of the thermal reservoir. Step S103, optimizing the spatial location of the injection network for highly deviated wells, specifically includes: Based on the mutual influence of well spacing for water intake with different steep inclinations, an analytical formula for well spacing for steep inclinations is obtained. The analytical formula for the well spacing of highly deviated wells is: ； In the formula, Well density, in wells per km 2 ; Indicates the geological reserves of the thermal reservoir, 10 4 t; The correlation coefficient with formation water properties and thermal reservoir properties is 0.153; The average total investment per well, 10 4 Yuan / kou; For economic calculations of geothermal development, the figure is yuan per cubic meter. For the thermal storage area, km² 2 E D For oil displacement efficiency.

2. The method for developing and extracting water from a highly deviated well in a thick thermal reservoir according to claim 1, characterized in that, Step S101, conducting evaluation studies on thick-layer geothermal reservoirs and heterogeneity to determine the distribution patterns of geothermal reservoirs, specifically includes: By combining well and seismic data, the stratigraphic framework and fault characteristics of the regional geothermal reservoir are obtained. The thickness of the geothermal reservoir at the completed drilling location is obtained through well data. The occurrence of the geothermal reservoir between wells is obtained by combining seismic data. The distribution pattern of the geothermal reservoir is described by the variation pattern of the seismic waveform. Based on well logging and well logging data, the heterogeneity of the reservoir section is described, and the differences of geothermal reservoir sections at different locations within the section are characterized.

3. The method for developing and extracting water from a highly deviated well in a thick thermal reservoir according to claim 2, characterized in that, The description of heterogeneity includes: A comprehensive analysis of the reservoir properties of the proposed geothermal reservoir section was conducted, core calibration logging was performed, permeability bar charts were drawn at different locations, and the geothermal reservoir was classified and segmented using a heterogeneity description method to determine the permeability difference level of different geothermal reservoir sections.

4. A method for developing and extracting water from a highly deviated well in a thick thermal reservoir according to any one of claims 1-3, characterized in that, The distribution pattern of the thermal reservoir includes the characterization of the reservoir thickness: for completed wells, the reservoir thickness is divided by the characteristics of the logging curves, and the rhythm type of the reservoir section is obtained by combining the curve morphology; for inter-well thermal reservoirs, the waveform characteristics of the three-dimensional seismic data are used for comparative prediction.

5. The method for developing and extracting water from a highly deviated well in a thick thermal reservoir according to claim 4, characterized in that, The rhythm types include positive rhythm, negative rhythm, and compound rhythm.

6. A method for developing and extracting water from a highly deviated well in a thick thermal reservoir according to any one of claims 1-3, characterized in that, The distribution pattern of the thermal reservoir also includes the description of the heterogeneity of the thermal reservoir section. Combined with the rhythmic characteristics of the thermal reservoir section, core calibration logging is performed to obtain the physical property change pattern of the thermal reservoir section from shallow to deep.

7. The method for developing and extracting water from a highly deviated well in a thick thermal reservoir according to claim 1, characterized in that, In the aforementioned differential well spacing, the well spacing for irrigation in the upper high-permeability section is 350-380 m, and the well spacing for irrigation in the lower low-permeability section is 250-280 m.

8. The method for developing and extracting water from a highly deviated well in a thick thermal reservoir according to claim 1, characterized in that, It also includes establishing geological models with different well spacings in the plane and vertical direction, applying numerical simulation methods to predict and select the optimal design parameters.

9. A development system for thick-layered, highly deviated wells, characterized in that: The system includes: a determination unit, a design unit, and an optimization unit; wherein... The unit is defined to conduct evaluation studies on thick thermal reservoirs and heterogeneity, and to determine the distribution pattern of thermal reservoirs; The design unit is used to design the injection and drainage well pattern of highly deviated wells based on the distribution pattern of thermal reservoirs. The optimization unit is used to optimize the spatial location of the injection and drainage well network for highly deviated wells; The design unit is specifically used for: Based on the heterogeneity of the reservoir and the impact of the difference in permeability between the upper and lower parts of the main reservoir on the extraction and injection of highly deviated wells, and combined with the difference in permeability between the upper and lower parts of the reservoir, a differential well spacing is adopted to obtain a differential well spacing that can achieve uniform extraction and injection. In areas with relatively high permeability, the well spacing is increased, while in areas with relatively low permeability, the well spacing is decreased, thereby compensating for the impact of differences in the heterogeneity of the thermal reservoir. The optimization unit is specifically used for: Based on the mutual influence of well spacing for water intake with different large inclinations, the analytical formula for well spacing for large inclinations is optimized. At the same time, by establishing geological models with different well spacings in the plane and vertical direction, numerical simulation methods are applied to predict and select the optimal design parameters. The analytical formula for the well spacing of highly deviated wells is: ； In the formula, Well density, in wells per km 2 ; Indicates the geological reserves of the thermal reservoir, 10 4 t; The correlation coefficient with formation water properties and thermal reservoir properties is 0.153; The average total investment per well, 10 4 Yuan / kou; For economic calculations of geothermal development, the figure is yuan per cubic meter. For the thermal storage area, km² 2 E D For oil displacement efficiency.

10. A thick-layer thermal reservoir high-angle well extraction and irrigation development system according to claim 9, characterized in that, The determining unit is specifically used for: By combining well and seismic data, the stratigraphic framework and fault characteristics of the regional geothermal reservoir are obtained. The thickness of the geothermal reservoir at the completed drilling location is obtained through well data. The occurrence of the geothermal reservoir between wells is obtained by combining seismic data. The distribution pattern of the geothermal reservoir is described by the variation pattern of the seismic waveform. Based on well logging and well logging data, the heterogeneity of the reservoir section is described, and the differences of geothermal reservoir sections at different locations within the section are characterized.

11. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that cause a processor to execute and implement the extraction and irrigation development method for a thick thermal reservoir with a high deviation well as described in any one of claims 1-8.

12. 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, it implements a method for extraction and irrigation development of a thick thermal reservoir with a high deviation well as described in any one of claims 1-8.

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