Brine mining well structure
By using the combination technology of main extraction wells, auxiliary extraction wells and crack structures in the salt lake brine brine wells, the problem of difficulty in extraction of deep brine resources is solved, and the recovery rate of brine resources is significantly improved.
Patent Information
- Application Number
- CN202421710191.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-18
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-07-18
AI Technical Summary
The existing salt lake brine brine harvesting technology is difficult to effectively extract deep brine resources, resulting in a low recovery rate of brine resources.
A halogen well structure including a main pumping well, an auxiliary pumping well and a crack structure is adopted. The first end of the auxiliary pumping well is connected to the external environment and the second end is connected to the main pumping well. Partly located in the target salt layer, the crack structure is connected to the auxiliary pumping well, increasing the permeability of the target salt layer.
By increasing the permeability of the salt layer, the contact between the solvent and the salt layer is improved, the mineral resources are dissolved and replaced more efficiently, and the recovery rate of brine resources is improved.
Smart Images
Figure CN222909999U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of salt lake brine extraction, and particularly to a brine extraction well structure. Background Art
[0002] For a long time, brine extraction in Qinghai Salt Lake has mainly been carried out in the shallow layer. The brine extraction methods are canal extraction + well extraction, with canal extraction as the main method and well extraction as the auxiliary method. After decades of brine extraction, the canal extraction experience has been quite mature, but it can only extract shallow brine with shallow burial depth, good water-richness, and good recharge conditions. Due to factors such as the small permeability coefficient and poor fluidity of the deep brine layer, the time required for the brine far from the brine extraction well to replenish into the well is relatively long, resulting in insufficient water inflow in the brine extraction well, and the brine extraction capacity of the brine extraction well does not match the brine extraction capacity of the brine extraction pump. The brine extraction pump needs to extract intermittently, and the brine extraction work load is relatively large. The deep brine resources cannot be effectively extracted, and the recovery rate of brine resources is relatively low. Content of the Utility Model
[0003] The main purpose of the utility model is to provide a brine extraction well structure, which can effectively extract deep brine resources, and has a relatively high recovery rate of brine resources.
[0004] To achieve the above purpose, the utility model provides a brine extraction well structure, including: a main extraction well, which extends along the vertical direction and is configured to communicate with the target salt layer; an auxiliary extraction well, which is arranged on the outer periphery of the main extraction well. The first end of the auxiliary extraction well communicates with the external environment, the second end of the auxiliary extraction well communicates with the main extraction well, and a part of the auxiliary extraction well is located in the target salt layer; and a fracture structure, which is located in the target salt layer and is connected to the part of the auxiliary extraction well located in the target salt layer.
[0005] Further, the auxiliary extraction well includes a first extraction section and a second extraction section. The first extraction section extends from the outside to the inside of the target salt layer, and the second extraction section extends from the end of the first extraction section to the part of the main extraction well located in the target salt layer.
[0006] Further, the second extraction section is located at the bottom of the target salt layer; and / or, the first extraction section and the second extraction section are arranged at a first preset angle, and the value range of the first preset angle is 90° - 120°.
[0007] Further, there are multiple fracture structures, and the multiple fracture structures are arranged at intervals along the circumferential direction and / or the length extension direction of the second extraction section.
[0008] Further, the fracture structure includes a main fracture and multiple branch fractures connected to the main fracture, and the main fracture is connected to the second extraction section.
[0009] Further, there are at least two auxiliary extraction wells, and the at least two auxiliary extraction wells are arranged at intervals along the circumferential direction of the main extraction well. A second preset angle is provided between two adjacent auxiliary extraction wells, and the value range of the second preset angle is 90° to 120°.
[0010] Further, along the vertical direction, the main extraction well penetrates through the target salt layer.
[0011] Further, there are multiple main extraction wells and multiple auxiliary extraction wells. A plurality of auxiliary extraction wells are arranged on the outer periphery of each main extraction well, and the multiple auxiliary extraction wells are all communicated with the corresponding main extraction well.
[0012] Further, the brine extraction well structure further includes a conveying device, and one end of the conveying device extends into the main extraction well.
[0013] Further, the brine extraction well structure further includes a fracturing device, and the fracturing device is arranged at the first end of the auxiliary extraction well.
[0014] Applying the technical solution of the present utility model, the brine extraction well structure includes a main extraction well, an auxiliary extraction well and a fracture structure. The first end of the auxiliary extraction well is communicated with the external environment, the second end of the auxiliary extraction well is communicated with the main extraction well, a part of the auxiliary extraction well is located in the target salt layer, the fracture structure is located in the target salt layer and is connected with the part of the auxiliary extraction well located in the target salt layer. The fracture structure can increase the permeability of the target salt layer, so that the solvent can fully contact the target salt layer, and further can dissolve and displace more mineral resources, improving the recovery rate of brine resources. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] The specification drawings constituting a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:
[0016] Figure 1 A structural schematic diagram of the brine extraction well structure according to an embodiment of the present utility model is shown from one angle;
[0017] Figure 2 A structural schematic diagram of the brine extraction well structure according to an embodiment of the present utility model is shown from another angle.
[0018] Among them, the above-mentioned drawings include the following reference numerals:
[0019] 10. Main extraction well; 20. Target salt layer; 30. Auxiliary extraction well; 31. First extraction section; 32. Second extraction section; 40. Fracture structure; 41. Main fracture; 42. Branch fracture; 50. Conveying device; 60. Fracturing device. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0020] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other. The following will describe the present utility model in detail with reference to the drawings and in conjunction with the embodiments.
[0021] Referring to Figure 1 and Figure 2 As shown, the present utility model provides a brine extraction well structure, which includes: a main extraction well 10, the main extraction well 10 extends in the vertical direction and is configured to communicate with the target salt layer 20; an auxiliary extraction well 30, the auxiliary extraction well 30 is arranged on the outer periphery of the main extraction well 10, the first end of the auxiliary extraction well 30 communicates with the external environment, the second end of the auxiliary extraction well 30 communicates with the main extraction well 10, and a part of the auxiliary extraction well 30 is located in the target salt layer 20; and a fracture structure 40, the fracture structure 40 is located in the target salt layer 20 and communicates with the part of the auxiliary extraction well 30 located in the target salt layer 20.
[0022] In this embodiment, one end of the main extraction well 10 communicates with the outside, the other end of the main extraction well 10 extends vertically to the target salt layer 20, and the auxiliary extraction well 30 is arranged on the outer periphery of the main extraction well 10. Since the first end of the auxiliary extraction well 30 communicates with the external environment, the high-temperature and high-pressure gas generated by the high-energy gas fracturing device enters the auxiliary extraction well 30. The high-temperature and high-pressure gas exerts pressure on the well wall of the auxiliary extraction well 30 to form a fracture structure 40. The fracture structure 40 communicates with the part of the auxiliary extraction well 30 located in the target salt layer 20. The fracture structure 40 can increase the permeability of the target salt layer 20, enabling the solvent to fully contact the target salt layer 20, and thus being able to dissolve and displace more mineral resources. The brine in the auxiliary extraction well 30 converges into the main extraction well 10, and finally the brine is pumped out of the main extraction well 10 through a conveying device 50 (such as a pump) of the existing technology. Through the above settings, the deep brine resources can be effectively extracted, and the recovery rate and exploitation rate of the brine resources can be improved.
[0023] Referring to Figure 1 and Figure 2 As shown in an embodiment of the present utility model, the auxiliary extraction well 30 includes a first extraction section 31 and a second extraction section 32. The first extraction section 31 extends from the outside to the inside of the target salt layer 20, and the second extraction section 32 extends from the end of the first extraction section 31 to the part of the main extraction well 10 located in the target salt layer 20.
[0024] In this embodiment, the second extraction section 32 communicates with the first extraction section 31. Since the first extraction section 31 communicates with the outside, the high-temperature and high-pressure gas generated by the high-energy gas fracturing device can enter the second extraction section 32 through the first extraction section 31 and exert pressure on the inner wall of the second extraction section 32, so that a fracture structure 40 communicating with the second extraction section 32 can be generated in the target salt layer 20.
[0025] As Figure 2 shown, in an embodiment of the present utility model, the second extraction section 32 is located at the bottom of the target salt layer 20.
[0026] In this embodiment, the second extraction section 32 is located at the bottom of the target salt layer 20, which can provide a larger accommodation space for the fracture structure 40 and further improve the permeability of the target salt layer 20.
[0027] In an embodiment of the present utility model, the first extraction section 31 and the second extraction section 32 are arranged at a first preset angle, and the value range of the first preset angle is 90° to 120°.
[0028] Through the above settings, on the one hand, it can reach the target salt layer 20 more directly, reducing energy consumption. On the other hand, it can effectively cover the target salt layer 20, reducing the unextracted area and improving the recovery rate of brine resources.
[0029] It should be noted that the first extraction section 31 is inclined relative to the horizontal plane, which can increase the extraction range of the first extraction section 31 to a certain extent, solving the problem of insufficient water inflow in a single brine extraction well. Compared with canal extraction, the brine extraction structure of the present application does not need to carry out large-scale mining on the target salt layer 20, causing less disturbance to the mining area geology, reducing the deep brine extraction cost, and realizing the safe and efficient development and utilization of salt lake brine.
[0030] Combined with reference to Figure 1 and Figure 2 shown, in an embodiment of the present utility model, there are multiple fracture structures 40, and the multiple fracture structures 40 are arranged at intervals along the circumferential direction and / or the length extension direction of the second extraction section 32.
[0031] Through the above settings, the permeability of the target salt layer 20 can be further increased, enabling the solvent to fully contact the target salt layer 20, and thus being able to dissolve and displace more mineral resources.
[0032] As Figure 2 shown, in an embodiment of the present utility model, the fracture structure 40 includes a main fracture 41 and a plurality of branch fractures 42 connected to the main fracture 41, and the main fracture 41 is connected to the second extraction section 32.
[0033] In this embodiment, the setting of the plurality of branch fractures 42 increases the complexity of the fracture structure 40, can greatly improve the permeability of the target salt layer 20, and at the same time, can also increase the contact area between the solvent and the target salt layer 20, thereby improving the recovery rate of brine resources.
[0034] Combined with reference to Figure 1 and Figure 2As shown in the figure, in one embodiment of the present utility model, there are at least two auxiliary extraction wells 30. The at least two auxiliary extraction wells 30 are arranged at intervals along the circumferential direction of the main extraction well 10, and a second preset angle is provided between two adjacent auxiliary extraction wells 30. The value range of the second preset angle is 90° to 120°.
[0035] Through the above settings, it is possible to ensure the area of the target salt layer 20 covered by the auxiliary extraction wells 30 and improve the recovery rate of brine resources.
[0036] As Figure 1 shown, in one embodiment of the present utility model, along the vertical direction, the main extraction well 10 penetrates through the target salt layer 20.
[0037] In this embodiment, the main extraction well 10 penetrates through the target salt layer 20. On the one hand, it can ensure the brine capacity of the main extraction well 10. On the other hand, the connection position between the auxiliary extraction well 30 and the main extraction well 10 can be set closer to the bottom of the target salt layer 20. Thus, it can be ensured that, along the length extension direction of the auxiliary extraction well 30, the part of the auxiliary extraction well 30 located within the target salt layer 20 is closer to the target salt layer 20, and further, a larger accommodation space can be provided for the fracture structure 40, further improving the permeability of the target salt layer 20.
[0038] Combined with reference to Figure 1 and Figure 2 shown, in one embodiment of the present utility model, there are multiple main extraction wells 10 and multiple auxiliary extraction wells 30. A plurality of auxiliary extraction wells 30 are arranged on the outer periphery of each main extraction well 10, and the multiple auxiliary extraction wells 30 are all connected to the corresponding main extraction well 10.
[0039] Through the above settings, the recovery efficiency of brine resources can be further improved.
[0040] Combined with reference to Figure 1 and Figure 2 shown, in one embodiment of the present utility model, the brine extraction well structure further includes a conveying device 50, and one end of the conveying device 50 extends into the main extraction well 10.
[0041] In this embodiment, the conveying device 50 includes a conveying pipeline and a pump body. The pump body is arranged on the conveying pipeline. One end of the conveying pipeline extends into the main extraction well 10. The brine collected in the main extraction well 10 can be pumped out through the conveying pump, realizing the green and low-carbon extraction of deep brine in the salt lake.
[0042] As Figure 1 shown, in one embodiment of the present utility model, the brine extraction well structure further includes a fracturing device 60, and the fracturing device 60 is arranged at the first end of the auxiliary extraction well 30.
[0043] In this embodiment, the fracturing device 60 is arranged at the first end of the auxiliary extraction well 30. The high-temperature and high-pressure gas generated by the fracturing device 60 enters the auxiliary extraction well 30 and applies pressure to the well wall of the auxiliary extraction well 30, finally forming a fracture structure 40. The fracture structure 40 can increase the permeability of the target salt layer 20, enabling the solvent to come into full contact with the target salt layer 20, and thus being able to dissolve and displace more mineral resources.
[0044] It should be noted that the fracturing device 60 is a high-energy gas fracturing device of the prior art, and its specific structure will not be elaborated here. Compared with hydraulic fracturing, after high-energy gas fracturing, due to the action of residual stress, the fractures can maintain a certain aperture, without the need to add proppants, and the main components of the gas generated by gunpowder combustion are carbon dioxide, carbon monoxide and water, which cause little pollution to the target salt layer 20 and raw brine, and have the advantages of environmental protection, energy conservation, low damage to the target salt layer 20, and good production increase effect.
[0045] The construction process of the brine extraction well structure of this application is as follows: According to the mineral resource reserves and regional area in the target salt layer 20, drill vertically towards the location of the target salt layer 20 to form the main extraction well 10. Use directional horizontal drilling technology to construct the auxiliary extraction well 30 on the outer periphery of the main extraction well 10, and then use the fracturing device 60 to fracture a fracture structure 40 in the target salt layer 20 that is connected to the part of the auxiliary extraction well located in the target salt layer 20. The brine extraction well structure of this application can solve the problem that low-permeability and dense salt bodies cannot effectively extract mineral resources, and at the same time can increase production and ensure the service life of the brine extraction well structure.
[0046] In one embodiment, there is one main extraction well 10 and four auxiliary extraction wells 30. The four auxiliary extraction wells 30 are arranged at equal intervals along the circumferential direction of the main extraction well 10. At this time, the extraction area covered by the brine extraction well structure is a square area (such as Figure 2 the square area shown is the extraction area).
[0047] From the above description, it can be seen that the above embodiments of the present utility model achieve the following technical effects: The brine extraction well structure includes a main extraction well, an auxiliary extraction well and a fracture structure. The first end of the auxiliary extraction well is communicated with the external environment, the second end of the auxiliary extraction well is communicated with the main extraction well, a part of the auxiliary extraction well is located in the target salt layer, the fracture structure is located in the target salt layer and is connected to the part of the auxiliary extraction well located in the target salt layer. The fracture structure can increase the permeability of the target salt layer, enabling the solvent to come into full contact with the target salt layer, and thus being able to dissolve and displace more mineral resources, improving the recovery rate of brine resources.
[0048] Obviously, the embodiments described above are only a part of the embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0049] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0050] The above description is only the preferred embodiment of the present utility model and is not intended to limit the present utility model. For those skilled in the art, the present utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.
Claims
1. A brine mining well structure, characterized in that: include: A main extraction well (10), the main extraction well (10) extending in a vertical direction and configured to communicate with a target salt layer (20); an auxiliary extraction well (30), wherein the auxiliary extraction well (30) is arranged at the periphery of the main extraction well (10), a first end of the auxiliary extraction well (30) is connected to the external environment, a second end of the auxiliary extraction well (30) is connected to the main extraction well (10), and a part of the auxiliary extraction well (30) is located in the target salt layer (20); and A fracture structure (40), wherein the fracture structure (40) is located in the target salt layer (20) and is connected to a portion of the auxiliary extraction well (30) located in the target salt layer (20).
2. The brine mining well structure according to claim 1, characterized in that: The auxiliary extraction well (30) comprises a first extraction section (31) and a second extraction section (32), wherein the first extraction section (31) extends from the outside to the target salt layer (20), and the second extraction section (32) extends from the end of the first extraction section (31) to the portion of the main extraction well (10) located in the target salt layer (20).
3. The brine mining well structure according to claim 2 is characterized in that: The second extraction section (32) is located at the bottom of the target salt layer (20); and / or the first extraction section (31) and the second extraction section (32) are arranged at a first preset angle, and the value range of the first preset angle is 90° to 120°.
4. The brine mining well structure according to claim 2 is characterized in that: There are a plurality of the fracture structures (40), and the plurality of the fracture structures (40) are arranged at intervals along the circumferential direction and / or the length extension direction of the second extraction section (32).
5. The brine mining well structure according to claim 2, characterized in that: The fracture structure (40) comprises a main fracture (41) and a plurality of branch fractures (42) connected to the main fracture (41), and the main fracture (41) is connected to the second extraction section (32).
6. The brine extraction well structure according to any one of claims 1 to 5, characterized in that: There are at least two auxiliary extraction wells (30), and at least two of the auxiliary extraction wells (30) are arranged at intervals along the circumference of the main extraction well (10). Two adjacent auxiliary extraction wells (30) are arranged at a second preset angle, and the value range of the second preset angle is 90° to 120°.
7. The brine extraction well structure according to any one of claims 1 to 5, characterized in that: Along the vertical direction, the main extraction well (10) penetrates the target salt layer (20).
8. The brine extraction well structure according to any one of claims 1 to 5, characterized in that: There are multiple main extraction wells (10) and multiple auxiliary extraction wells (30), and multiple auxiliary extraction wells (30) are arranged on the periphery of each main extraction well (10), and the multiple auxiliary extraction wells (30) are connected to the corresponding main extraction well (10).
9. The brine extraction well structure according to any one of claims 1 to 5, characterized in that: The brine extraction well structure further comprises a conveying device (50), one end of which extends into the main extraction well (10).
10. The brine extraction well structure according to any one of claims 1 to 5, characterized in that: The brine extraction well structure further comprises a fracturing device (60), and the fracturing device (60) is arranged at the first end of the auxiliary extraction well (30).