Design method and device for thick-layer heat storage, taking and irrigation well pattern, electronic equipment and storage medium

Abstract

The invention discloses a design method and device for a thick-layer heat storage taking and irrigation well pattern, electronic equipment and a storage medium, and the method comprises the steps: analyzing thick-layer heat storage and interlayer distribution characteristics; according to the thick-layer heat storage and interlayer distribution characteristics, a double-horizontal-well taking and irrigation well pattern is designed; and optimizing the length and the spatial position of the horizontal section of the double-horizontal-well taking and filling well pattern. According to the method, a thick-layer heat storage double-horizontal-well taking and filling development mode is established for thick-layer heat storage geothermal energy development, the taking and filling effect of the thick-layer heat storage geothermal energy can be greatly improved, and the purpose of improving the heat utilization rate can be achieved.

Description

Technical Field

[0001] The present invention belongs to the field of geothermal development, and in particular relates to a design method, device, electronic equipment and storage medium for a thick-layer heat storage and extraction well network. Background Art

[0002] Geothermal development is the development of renewable heat energy stored in the earth's interior to achieve the purpose of utilization. Geothermal energy is a special resource. First of all, it can be developed and utilized by people like other resources to benefit mankind. At the same time, it is very different from other resources. In the process of its development and utilization, it does not destroy the ecological environment like some resources. On the contrary, the rational use of geothermal resources can effectively maintain the ecological environment.

[0003] The conventional method of developing geothermal energy is to pump water into the ground through a vertical well. After the water permeates through the ground, it exchanges underground heat and then retrieves the injected water through another vertical well. The disadvantage of this method is that for some thick-layer heat reservoirs, the water extraction and re-injection intensity of conventional vertical wells are limited. Summary of the invention

[0004] In order to overcome the defects of the above-mentioned prior art, the purpose of the present invention is to improve the extraction and injection effect of geothermal heat storage in high-thick layers. To achieve the above-mentioned purpose, the present invention provides the following technical solutions:

[0005] A design method for a thick-layer heat storage and extraction well network, the method comprising:

[0006] Analyze the distribution characteristics of thick-layer heat storage and interlayers;

[0007] According to the distribution characteristics of thick-layer heat storage and interlayer, a double horizontal well extraction and injection well network is designed;

[0008] Optimization of horizontal section length and spatial position of double horizontal well filling and drainage network.

[0009] Further, the analysis of the distribution characteristics of thick-layer heat reservoirs includes:

[0010] Based on the combined well-seismic geological interpretation, the heat reservoir distribution law and thick-layer heat reservoir distribution characteristics are determined.

[0011] Further, the analysis of the interlayer distribution characteristics includes:

[0012] Based on the combined geological interpretation of well and seismic data, the intercalation method is used to draw the well interval interlayers and analyze the distribution characteristics of the interlayers.

[0013] Furthermore, when drawing well interlayers, relatively low permeability layers or impermeable layers are considered as interlayers.

[0014] Furthermore, when designing the double horizontal well filling and extraction network, an upper filling and lower extraction method is adopted.

[0015] Furthermore, when designing the double horizontal well extraction and injection well network, the injection well network avoids the interlayer.

[0016] Furthermore, when designing a dual-horizontal well injection and recharging network, injection wells are deployed in high parts of the geological structure, and water intake wells are deployed in low parts of the geological structure.

[0017] Furthermore, the design of the double horizontal well extraction and injection well network includes:

[0018] According to the basic data of the interlayer, a double horizontal well extraction and injection network is set up;

[0019] The basic data of the interlayer include the length, width and thickness of the interlayer as well as the continuous heat storage section.

[0020] Furthermore, the optimization of the horizontal length of the double horizontal well network includes:

[0021] Obtain various optimization factors required for optimizing the horizontal segment length;

[0022] Calculate the optimal length of the horizontal section based on the length optimization formula and various optimization factors.

[0023] Further, optimization factors include:

[0024] Permeability Kh, thickness h, production pressure difference ΔP, volume coefficient Bo, viscosity μo, horizontal well length L, reservoir anisotropy coefficient β, wellbore radius rw, single well control radius re, single well control coefficient a.

[0025] Furthermore, the formula for calculating the optimal length of the horizontal segment is:

[0026]

[0027] Among them, Q is the production capacity of the dual horizontal well network.

[0028] Furthermore, the spatial location optimization of the dual horizontal well extraction and injection well network includes:

[0029] Combined with the thermal cycle numerical simulation, the designed dual horizontal well extraction and injection network is run;

[0030] According to the simulation results, the spatial position of the designed dual horizontal well extraction and injection well network is optimized to obtain a new dual horizontal well extraction and injection well network.

[0031] Furthermore, when the spatial location of the double horizontal wells is combined with the thermal cycle numerical simulation, the following data are recorded:

[0032] During the seepage process of the reinjection water of the horizontal well, the temperature change value caused by the reinjection, the temperature change increase and decrease amplitude, and the length affected by the maximum change amplitude.

[0033] A design device for a thick-layer heat storage and extraction well network, characterized in that the device comprises:

[0034] Analysis module, used to analyze the distribution characteristics of thick-layer heat storage and interlayers;

[0035] Well pattern design module, used to design double horizontal well extraction and injection patterns according to the distribution characteristics of thick-layer heat storage and interlayers;

[0036] The optimization module is used to optimize the horizontal section length and the spatial position of the double horizontal well injection and injection.

[0037] Furthermore, the device also includes: a data acquisition module for acquiring data for analyzing the distribution characteristics of thick-layer heat storage and interlayers.

[0038] Furthermore, the analysis module has at least a well-seismic combined geological interpretation function, a single well identification function, and a spread drawing function.

[0039] Furthermore, the well pattern design module can set up a double horizontal well extraction and injection pattern according to the basic data of the interlayer.

[0040] Furthermore, the optimization module can calculate the optimized length of the horizontal segment according to the optimization factors.

[0041] Furthermore, the optimization module can run the designed dual horizontal well extraction and injection network in combination with the thermal cycle numerical simulation, and can optimize the spatial position of the designed dual horizontal well extraction and injection network according to the simulation results to obtain a new dual horizontal well extraction and injection network.

[0042] An electronic device, characterized in that it comprises a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus;

[0043] Memory, used to store computer programs;

[0044] The processor is used to implement the above method when executing the program stored in the memory.

[0045] A computer-readable storage medium stores a computer program thereon, wherein the computer program implements the method described above when executed by a processor.

[0046] Technical effects and advantages of the present invention:

[0047] In the present invention, for the development of thick-layer heat reservoir geothermal energy, a thick-layer heat reservoir double-horizontal well extraction and injection development mode is established, which can greatly improve the extraction and injection effect of thick-layer heat reservoir geothermal energy and achieve the purpose of improving heat utilization rate.

[0048] 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

[0049] Figure 1 This is a flow chart of a design method for a thick-layer heat storage and extraction well network of the present invention;

[0050] Figure 2 is a seismic profile of a thick-layer thermal reservoir according to an embodiment of the present invention;

[0051] Figure 3 is a cross-sectional view of a thick-layer heat storage according to an embodiment of the present invention;

[0052] Figure 4 is a thickness contour map of thick-layer heat reservoir according to an embodiment of the present invention;

[0053] Figure 5 is a partial enlarged diagram of a thickness contour map of a thick-layer heat reservoir according to an embodiment of the present invention;

[0054] Figure 6 is a well logging diagram for identifying interlayers according to an embodiment of the present invention;

[0055] Figure 7 is a cross-sectional view of a thick-layer heat storage section interlayer according to an embodiment of the present invention;

[0056] Figure 8 is a cross-sectional schematic diagram of a dual horizontal well extraction and injection well network design according to an embodiment of the present invention;

[0057] Fig. 9 2. It is a schematic plan view of a dual horizontal well extraction and injection well network design according to an embodiment of the present invention;

[0058] Fig.10 is a curve showing the relationship between the horizontal section length and the production capacity according to an embodiment of the present invention. DETAILED DESCRIPTION

[0059] 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.

[0060] In addition, in the invention, the terms "first", "second" and other similar words are not intended to imply any order, quantity and importance, but are merely used to distinguish different elements, and the terms "upper", "lower", "left", "right" and other similar words are merely positional relationships in the drawings.

[0061] In the present invention, for the development of thick-layer heat reservoir geothermal, a thick-layer heat reservoir double horizontal well extraction and injection development mode is established, which can greatly improve the extraction and injection effect of thick-layer heat reservoir geothermal and achieve the purpose of improving heat utilization rate. The following is an illustration through specific embodiments.

[0062] In order to solve the deficiencies of the prior art, the present invention discloses a design method for a thick-layer heat storage and extraction well network, the method comprising:

[0063] Analyze the distribution characteristics of thick-layer heat storage and interlayers;

[0064] According to the distribution characteristics of thick-layer heat storage and interlayer, a double horizontal well extraction and injection well network is designed;

[0065] Optimization of horizontal section length and spatial position of double horizontal well filling and drainage network.

[0066] Specific:

[0067] Analysis of thick-layer heat reservoir distribution characteristics includes:

[0068] Based on the combined well-seismic geological interpretation, the heat reservoir distribution law and thick-layer heat reservoir distribution characteristics are determined.

[0069] like Figure 2 As shown, Figure 2 The heat reservoir seismic profile provided by the embodiment of the present invention can analyze the seismic reflection characteristics based on the well-seismic combined geological interpretation and the data provided by the completed wells in the area, so as to judge the distribution characteristics of the thick-layer heat reservoir;

[0070] like Figure 3 , Figure 4 , Figure 5 As shown, Figure 3 , Figure 4 , Figure 5 In the embodiment of the present invention, according to Figure 2 The provided heat reservoir seismic profile is combined with the completed wellbore data to provide thick-layer heat reservoir distribution characteristics.

[0071] Analysis of interlayer distribution features includes:

[0072] Based on the combined geological interpretation of well and seismic data, the intercalation method is used to draw the well interval interlayers and analyze the distribution characteristics of the interlayers.

[0073] like Figure 6 As shown, Figure 6This is the well logging diagram for interlayer identification. The thick horizontal line in the figure reflects the seismic characteristics of typical interlayers. Based on the well-seismic combined geological interpretation and combined with the data provided by the completed wells in the area, the well interlayers are drawn using the interpolation method and the distribution characteristics of the interlayers are analyzed. The results are shown in the figure below. Figure 7 shown.

[0074] It should be noted that when drawing well interlayers, relatively low permeability layers or impermeable layers are regarded as interlayers.

[0075] As a seepage barrier, the distribution of interlayers has a great influence on vertical permeability. Interlayers are mainly formed under weak hydrodynamic conditions, and are often formed in abandoned river channels after river migration and diversion. The lithology is mainly mudstone, silty mudstone, muddy siltstone, siltstone and gravel-bearing mudstone. This type of interlayer has obvious logging curve characteristics, mainly manifested in low deep lateral resistivity, small and significantly low amplitude difference of microelectrode curve, high acoustic time difference, natural potential return and other characteristics.

[0076] Furthermore, in one embodiment of the present invention, a double horizontal well extraction and injection well pattern is designed according to the distribution characteristics of thick-layer heat storage and interlayer, specifically:

[0077] When designing a double horizontal well filling and drainage network, the following three points need to be considered:

[0078] Adopt the method of filling from top to bottom;

[0079] The well filling network avoids the interlayer;

[0080] Recharge wells are deployed in high parts of geological structures, and water extraction wells are deployed in low parts of geological structures.

[0081] The above three conditions are conducive to the migration of recharge water to the lower water intake horizontal well under the action of gravity. Figure 8 and Fig. 9 As shown, Figure 8 A schematic cross-sectional view of a dual horizontal well filling and drainage network design according to an embodiment of the present invention. Fig. 9 A schematic plan view of a dual horizontal well extraction and injection well network design provided in an embodiment of the present invention.

[0082] Further, in one embodiment of the present invention, when designing a double horizontal well extraction and injection well network, the double horizontal well extraction and injection well network is set according to the basic data of the interlayer;

[0083] The basic data of the interlayer include the length, width and thickness of the interlayer as well as the continuous heat storage section.

[0084] Further, in one embodiment of the present invention, the optimization of the horizontal section length of the dual horizontal well extraction and injection well network includes:

[0085] Obtain various optimization factors required for optimizing the horizontal segment length;

[0086] Calculate the optimal length of the horizontal section based on the length optimization formula and various optimization factors.

[0087] Optimization factors include:

[0088] Permeability K h , thickness h, production pressure difference ΔP, volume coefficient B o , viscosity μ o , horizontal well length L, reservoir anisotropy coefficient β, wellbore radius r w , single well control radius r e , single well control coefficient a.

[0089] The formula for calculating the optimal length of the horizontal segment is:

[0090]

[0091] Among them, Q is the production capacity of the dual horizontal well network.

[0092] like Fig.10 As shown, Fig.10 It is the relationship curve between horizontal section length and production capacity. According to the curve, the required length of the horizontal well under the condition of a given production capacity can be calculated.

[0093] Further, in one embodiment of the present invention, the spatial position optimization of the dual horizontal well extraction and injection well network includes:

[0094] Combined with the thermal cycle numerical simulation, the designed dual horizontal well extraction and injection network is run;

[0095] According to the simulation results, the spatial position of the designed dual horizontal well extraction and injection well network is optimized to obtain a new dual horizontal well extraction and injection well network.

[0096] When the spatial location of the double horizontal wells is combined with the thermal cycle numerical simulation, the following data are recorded:

[0097] During the seepage process of the reinjection water of the horizontal well, the temperature change value caused by the reinjection, the temperature change increase and decrease amplitude, and the length affected by the maximum change amplitude.

[0098] Another embodiment of the present invention provides a design device for a thick-layer heat storage and extraction well network, the device comprising:

[0099] Analysis module, used to analyze the distribution characteristics of thick-layer heat storage and interlayers;

[0100] Well pattern design module, used to design double horizontal well extraction and injection patterns according to the distribution characteristics of thick-layer heat storage and interlayers;

[0101] The optimization module is used to optimize the horizontal section length and the spatial position of the double horizontal well injection and injection.

[0102] The device also includes: a data acquisition module, which is used to acquire data for analyzing the distribution characteristics of thick-layer heat storage and interlayers.

[0103] According to the above method embodiment, the specific functions of the device embodiment can be analyzed as follows:

[0104] The analysis module has at least a well-seismic combined geological interpretation function, a single well identification function, and a spread drawing function.

[0105] The well pattern design module can set up a double horizontal well extraction and injection well pattern according to the basic data of the interlayer.

[0106] The optimization module can calculate the optimized length of the horizontal segment according to the optimization factors.

[0107] The optimization module can run the designed dual horizontal well extraction and injection network in combination with the thermal cycle numerical simulation, and can optimize the spatial position of the designed dual horizontal well extraction and injection network according to the simulation results to obtain a new dual horizontal well extraction and injection network.

[0108] Another embodiment of the present invention provides an electronic device, characterized in that it includes a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other through the communication bus;

[0109] Memory, used to store computer programs;

[0110] The processor is used to implement the method in the above method embodiment when executing the program stored in the memory.

[0111] Another embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program implements the method in the above method embodiment when executed by a processor.

[0112] The computer-readable storage medium may be included in the device / apparatus described in the above embodiment; or it may exist independently without being assembled into the device / apparatus. The above computer-readable storage medium carries one or more programs, and when the above one or more programs are executed, the method according to the embodiment of the present disclosure is implemented.

[0113] The computer-readable storage medium may be a non-volatile computer-readable storage medium, for example, may include but is not limited to: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In the present disclosure, a computer-readable storage medium may be any tangible medium containing or storing a program that may be used by or in conjunction with an instruction execution system, apparatus, or device.

[0114] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0115] 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 design method for a thick-layer heat storage and extraction well network, wherein: The method comprises: Analyze the distribution characteristics of thick-layer heat storage and interlayers; According to the distribution characteristics of thick-layer heat storage and interlayer, a double horizontal well extraction and injection well network is designed; Optimization of horizontal section length and spatial position of double horizontal well filling and drainage network.

2. The design method of a thick-layer heat storage and extraction well network according to claim 1 is characterized in that: Analysis of thick-layer heat reservoir distribution characteristics includes: Based on the combined well-seismic geological interpretation, the heat reservoir distribution law and thick-layer heat reservoir distribution characteristics are determined.

3. The design method of a thick-layer heat storage and extraction well network according to claim 1 is characterized in that: Analysis of interlayer distribution features includes: Based on the combined geological interpretation of well and seismic data, the intercalation method is used to draw the well interval interlayers and analyze the distribution characteristics of the interlayers.

4. The design method of a thick-layer heat storage and extraction well network according to claim 3 is characterized in that: When drawing well intercalation, relatively low permeability layers or impermeable layers are considered as intercalation.

5. The design method of a thick-layer heat storage and extraction well network according to claim 1 is characterized in that: When designing the double horizontal well filling and extraction network, the upper filling and lower extraction method is adopted.

6. The design method of a thick-layer heat storage and extraction well network according to claim 1 is characterized in that: When designing the double horizontal well extraction and injection well network, the injection well network should avoid the interlayer.

7. The design method of a thick-layer heat storage and extraction well network according to claim 1 is characterized in that: When designing a dual-horizontal well injection and recharging network, recharge wells are deployed in high parts of the geological structure, and water intake wells are deployed in low parts of the geological structure.

8. The design method of a thick-layer heat storage and extraction well network according to claim 1 is characterized in that: The design of double horizontal well extraction and filling network includes: According to the basic data of the interlayer, a double horizontal well extraction and injection network is set up; The basic data of the interlayer include the length, width and thickness of the interlayer as well as the continuous heat storage section.

9. The design method of a thick-layer heat storage and extraction well network according to claim 1 is characterized in that: The optimization of the horizontal length of the double horizontal well network includes: Obtain various optimization factors required for optimizing the horizontal segment length; Calculate the optimal length of the horizontal section based on the length optimization formula and various optimization factors.

10. A design method for a thick-layer heat storage and extraction well network according to claim 9, characterized in that: Optimization factors include: Permeability K h , thickness h, production pressure difference ΔP, volume coefficient B o , viscosity μ o , horizontal well length L, reservoir anisotropy coefficient β, wellbore radius r w , single well control radius r e , single well control coefficient a.

11. A method for designing a thick-layer heat storage and extraction well network according to claim 10, characterized in that: The formula for calculating the optimal length of the horizontal segment is: Among them, Q is the production capacity of the dual horizontal well network.

12. The design method of a thick-layer heat storage and extraction well network according to claim 1, characterized in that: The spatial location optimization of the dual horizontal well extraction and injection well network includes: Combined with the thermal cycle numerical simulation, the designed dual horizontal well extraction and injection network is run; According to the simulation results, the spatial position of the designed dual horizontal well extraction and injection well network is optimized to obtain a new dual horizontal well extraction and injection well network.

13. A method for designing a thick-layer heat storage and extraction well network according to claim 12, characterized in that: When the spatial location of the double horizontal wells is combined with the thermal cycle numerical simulation, the following data are recorded: During the seepage process of the reinjection water of the horizontal well, the temperature change value caused by the reinjection, the temperature change increase and decrease amplitude, and the length affected by the maximum change amplitude.

14. A design device for a thick-layer heat storage and extraction well network, characterized in that: The device comprises: Analysis module, used to analyze the distribution characteristics of thick-layer heat storage and interlayers; Well pattern design module, used to design double horizontal well extraction and injection patterns according to the distribution characteristics of thick-layer heat storage and interlayers; The optimization module is used to optimize the horizontal section length and the spatial position of the double horizontal well injection and injection.

15. A design device for a thick-layer heat storage and extraction well network according to claim 14, characterized in that: The device also includes: a data acquisition module, which is used to acquire data for analyzing the distribution characteristics of thick-layer heat storage and interlayers.

16. A design device for a thick-layer heat storage and extraction well network according to claim 14, characterized in that: The analysis module has at least a well-seismic combined geological interpretation function, a single well identification function, and a spread drawing function.

17. A design device for a thick-layer heat storage and extraction well network according to claim 14, characterized in that: The well pattern design module can set up a double horizontal well extraction and injection well pattern according to the basic data of the interlayer.

18. The design device for thick-layer heat storage and extraction well network according to claim 14, characterized in that: The optimization module can calculate the optimized length of the horizontal segment according to the optimization factors.

19. The design device for thick-layer heat storage and extraction well network according to claim 14, characterized in that: The optimization module can run the designed dual horizontal well extraction and injection network in combination with the thermal cycle numerical simulation, and can optimize the spatial position of the designed dual horizontal well extraction and injection network according to the simulation results to obtain a new dual horizontal well extraction and injection network.

20. An electronic device, characterized in that: It includes a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other through the communication bus; Memory, used to store computer programs; A processor, for implementing the method according to any one of claims 1 to 13 when executing a program stored in a memory.

21. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 13 is implemented.

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