CN111287703A - Closed underground brine mining system and construction method thereof - Google Patents
Closed underground brine mining system and construction method thereof Download PDFInfo
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- CN111287703A CN111287703A CN202010247797.0A CN202010247797A CN111287703A CN 111287703 A CN111287703 A CN 111287703A CN 202010247797 A CN202010247797 A CN 202010247797A CN 111287703 A CN111287703 A CN 111287703A
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- 239000012267 brine Substances 0.000 title claims abstract description 385
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 title claims abstract description 385
- 238000005065 mining Methods 0.000 title claims abstract description 76
- 238000010276 construction Methods 0.000 title claims abstract description 15
- 238000003860 storage Methods 0.000 claims abstract description 86
- 150000003839 salts Chemical class 0.000 claims abstract description 59
- 229910052736 halogen Inorganic materials 0.000 claims abstract description 28
- 150000002367 halogens Chemical class 0.000 claims abstract description 28
- 238000005192 partition Methods 0.000 claims abstract description 27
- 239000004576 sand Substances 0.000 claims abstract description 10
- 230000006835 compression Effects 0.000 claims description 55
- 238000007906 compression Methods 0.000 claims description 55
- 238000005553 drilling Methods 0.000 claims description 32
- 239000011435 rock Substances 0.000 claims description 32
- 238000000605 extraction Methods 0.000 claims description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 229910001868 water Inorganic materials 0.000 claims description 25
- 230000004888 barrier function Effects 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 230000015572 biosynthetic process Effects 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 239000011148 porous material Substances 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- 238000009412 basement excavation Methods 0.000 claims description 3
- 239000004568 cement Substances 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims 1
- 238000011084 recovery Methods 0.000 abstract description 14
- 239000010410 layer Substances 0.000 description 147
- 235000002639 sodium chloride Nutrition 0.000 description 93
- 238000004519 manufacturing process Methods 0.000 description 16
- 238000000926 separation method Methods 0.000 description 10
- 238000007599 discharging Methods 0.000 description 9
- 239000002344 surface layer Substances 0.000 description 9
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 description 7
- 239000011440 grout Substances 0.000 description 6
- 241001131796 Botaurus stellaris Species 0.000 description 5
- 230000035699 permeability Effects 0.000 description 5
- 238000003825 pressing Methods 0.000 description 5
- 239000002352 surface water Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000003337 fertilizer Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 241000722949 Apocynum Species 0.000 description 3
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 3
- 239000000872 buffer Substances 0.000 description 3
- 239000012141 concentrate Substances 0.000 description 3
- 238000011049 filling Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 239000011591 potassium Substances 0.000 description 3
- 229910052700 potassium Inorganic materials 0.000 description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 2
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 1
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000012271 agricultural production Methods 0.000 description 1
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 1
- 229910052794 bromium Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011033 desalting Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229940072033 potash Drugs 0.000 description 1
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 1
- 235000015320 potassium carbonate Nutrition 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000007569 slipcasting Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- XZPVPNZTYPUODG-UHFFFAOYSA-M sodium;chloride;dihydrate Chemical compound O.O.[Na+].[Cl-] XZPVPNZTYPUODG-UHFFFAOYSA-M 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/138—Plastering the borehole wall; Injecting into the formation
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The invention relates to the technical field of underground brine mining, and particularly provides a closed type underground brine mining system and a construction method thereof. The invention provides a closed underground brine mining system which comprises a gas compressing device, a first water-resisting layer, a second water-resisting layer, a brine storage layer, a partition wall, a brine discharge well and a water-resisting dam, wherein the brine storage layer is positioned between the first water-resisting layer and the second water-resisting layer. The upper end of the partition wall extends to the first waterproof layer, the lower end of the partition wall extends to the second waterproof layer, and the partition wall, the first waterproof layer, the second waterproof layer and the water-separating dam divide the brine storage layer into a plurality of closed spaces. The closed space is a halogen collecting block. The brine recovery device is characterized in that a pressure gas well is arranged in each brine recovery block and close to the center of a lake, brine discharge wells are arranged in the brine recovery blocks and close to the edges of the lake, brine discharge pipes are arranged in the brine discharge wells, and brine can be directly conveyed to a salt field or a sand basin after being discharged through the brine discharge pipes. The invention can reduce the brine mining cost, greatly improve the brine mining amount, improve the mining efficiency and improve the recovery ratio.
Description
Technical Field
The invention relates to the technical field of underground brine mining, in particular to a closed type underground brine mining system and a construction method thereof.
Background
The potassium salt is mainly divided into two types, one type is solid potassium salt which is mainly distributed in Canada, Russia, white Russia, Thailand, Laos and other countries, and China only has a small amount of distribution in the Yunnan river city; the other type of liquid brine mine is mainly distributed in salt lakes in arid and semi-arid regions, and China is mainly distributed in salt lakes in Qinghai, Xinjiang, Tibet and other regions in the west; the potassium salt resource is a strategic resource in China, and the potassium salt is mainly used for producing potash fertilizers and is used for agricultural production and is grain of grains.
China is the biggest potassium fertilizer consuming country in the world, and potassium salt is one of seven major and scarce mineral products in China and becomes an important strategic resource for guaranteeing national food safety. The KCl geological reserve of China is about 9.9 hundred million tons, mainly liquid brine mine is used, potassium fertilizer is produced mainly by collecting underground brine of a salt lake, the exploitation amount of most of brine of the salt lake surface salt rock stratum is seriously insufficient along with the continuation of the development period of the salt lake, the development strength is increased and the production amount is increased, the brine of the salt lake surface salt rock stratum cannot be normally produced, the service life of salt lake resources is continuously shortened, and the service life of the salt lake resources in China is less than 30 years.
The potassium salt resource amount of China only accounts for 2% of the globally proven reserves, but the production amount accounts for 15% of the global yield, and the potassium fertilizer consumption amount of China accounts for 25% of the global consumption amount; moreover, 97% of the amount of potassium salt resources in China is brine type salt lake deposit resources in Qinghai and Xinjiang, and by continuous high-intensity mining for decades, a part of salt lakes have no brine to be mined, most of salt lake salt rock layer surface submerged brine ores are exhausted, particularly underground brine at the lower part of a salt rock layer is mined by the salt lakes in the basin of the Chadada, the brine mining dilemma is temporarily relieved by water replenishing and solid-liquid conversion of a few salt lakes, and most of salt lake brine mining amount cannot meet the production requirement. The salt lake region of the Chaihu basin has a large amount of deep brine below a surface salt rock stratum, the deep brine is limited by the conditions of large buried depth of the stratum, relatively early formation time, low porosity and the like, and the brine storage layer mainly comprises salt fine sand layers, silt layers and rock salt layers with low porosity, so that the permeability is low, the water supply degree is low, the construction difficulty of brine extraction engineering is large, the excavation cost of a brine channel is high, but the brine extraction amount still cannot meet the production requirement, and as time goes on, the contradiction is more prominent, so that the simple, quick and efficient scientific brine extraction technology is urgently sought.
At present, the salt lake brine-mining engineering in China has three forms: the brine extraction method is a brine extraction method aiming at the salt lake surface layer salt rock stratum latent brine, and is quick, simple, efficient, low in cost, small in difficulty and easy to construct for the salt lake surface layer salt rock stratum brine; but for deep brine mine below the salt rock layer of the salt lake surface layer, the channel mining form has high engineering cost and poor effect; particularly for loose sediments such as salt-containing fine sand layers, silt layers and the like in brine storage layers, the brine extraction effect is worse because the brine extraction channel is easy to collapse, the depth of the channel is insufficient, the brine outflow speed is slow or the brine cannot flow out at all. Secondly, well mining, wherein the well mining technology of the brine is mainly aimed at deep bittern layers below deep bittern or salt lake surface salt rock layers, and the method is widely applied to the underground deep brine mining of developed areas of the bromine extraction and salt production industry in coastal areas due to simple, convenient and quick construction; however, the method has relatively small brine collection amount and channel brine collection, and is only limited to be used in a well-collected form in individual enterprises such as the Apocynum pool salt lake in a salt lake region, which is related to the special salt lake deposition of the Apocynum pool (because the deep brine storage layer of the Apocynum pool salt lake has the characteristics of high porosity, strong permeability and large water supply degree, the method is more suitable for utilizing a well-collected technology). Thirdly, a well-channel combined brine extracting mode, which is a brine extracting mode for extracting brine of a deep brine storage layer below a salt rock layer on the surface layer of a salt lake from most of the salt lakes at present, is not the best and most economical mode because the actual production requirements cannot be met only by adopting a single channel or well extraction; because the deep brine storage layer below the salt rock layer on the surface layer of the salt lake has low porosity, low flow rate and small brine extraction range, and the brine extraction channel has extremely high excavation cost, the brine extraction well with relatively simple arrangement construction can be arranged in an area where the brine extraction channel is difficult to extend, so that the defect of brine extraction can be overcome; however, for the deep halogen-storing layer below the salt rock layer on the surface layer of the salt lake with low porosity, low permeability and low water supply degree, the problems of small halogen production amount and difficulty in meeting the actual production requirements still exist.
From the prior art of mining brine in a deep brine storage layer below a salt lake surface salt rock layer, brine is mined mainly in a well and canal combination mode, and because the porosity, permeability and water supply degree of most of the brine in the deep brine in the salt lake are relatively low, open brine mining channels and brine mining wells are utilized, and brine is collected and mined in a manual or natural brine water level difference mode, so that the flow rate of the brine is low, the flow is small, the brine mining efficiency is low, the brine mining amount is small, the construction cost is high, the actual production requirement is difficult to meet, and for the salt lake with a large amount of lake surface water on the lake surface, the deep underground brine is more difficult to collect. As the brine collecting channel and the brine conveying channel do not need to be excavated, and the brine collecting pump station does not need to be arranged, the influence on the natural geographical and topographic environment of the salt lake is small, and the original natural ecological environment of the salt lake can be reserved to the maximum extent.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to provide a closed underground brine mining system and a construction method thereof, which can reduce the brine mining cost, greatly improve the brine mining amount, improve the mining efficiency and improve the recovery ratio, particularly for salt lakes with lake surface water, can avoid the engineering of excavating brine mining channels, and simultaneously avoid the direct mixing of surface layer lake water into a brine layer, and desalting and damaging the brine composition.
In order to solve the problems, the invention provides a closed underground brine mining system which comprises a gas compressing device, a first water-resisting layer, a second water-resisting layer, a brine storage layer, a partition wall, a brine discharge well and a water-resisting dam, wherein the brine storage layer is positioned between the first water-resisting layer and the second water-resisting layer; the dividing wall is a continuous curtain wall formed by drilling and grouting, the upper end of the dividing wall extends to the first waterproof layer, the lower end of the dividing wall extends to the second waterproof layer, and the dividing wall, the first waterproof layer, the second waterproof layer and the water-proof dam divide the halogen storage layer into a plurality of closed spaces; the closed space is provided with a pressure gas well close to the center of the lake, and the closed space is provided with a brine discharge well close to the edge of the lake, and the closed space is a brine extraction block.
Preferably, the gas compression device consists of an air compressor, gas compression wells and gas compression pipes, a plurality of gas compression wells are arranged in the brine extraction block, the air compressor conveys high-pressure gas to the gas compression wells through the gas compression pipes, and the gas compression wells are connected with the air compressor after being connected with each other through the gas compression pipes.
Preferably, the gas compression well is arranged at a position, close to the center of the lake, of the brine production block, the gas compression well vertically penetrates through the whole brine storage layer, a gas compression well casing is arranged at the mouth of the gas compression well, and the gas compression well casing extends from the ground surface to the upper surface of the brine storage layer.
Preferably, a gas compressing pipe is placed in the gas compressing well, the gas compressing pipe extends into the bottom of the gas compressing well, an air injection hole is formed in the lower pipe wall of the gas compressing pipe, a screen is wound on the pipe wall of the air injection hole to form a gas compressing screen pipe, and the gas compressing pipe is fixedly connected with the gas compressing well casing pipe and then connected with an air compressor on the ground.
Preferably, the dividing wall is a continuous curtain wall formed by drilling and grouting, the upper end of the continuous curtain wall extends to the first waterproof layer, and the lower end of the continuous curtain wall extends to the second waterproof layer.
Preferably, the dividing wall comprises a plurality of columnar bodies which are sequentially arranged side by side and connected with one another, and the dividing wall is a water-stop wall formed by combining 1-3 rows of the columnar bodies and/or formed by rotary drilling and/or rotary spraying.
Preferably, the dividing wall, the first water-resisting layer, the second water-resisting layer and the water-resisting dam divide the brine storage layer into a plurality of closed spaces, the closed spaces are provided with pressure gas wells near the center of the lake, brine discharge wells near the edge of the lake, and the closed spaces are brine extraction blocks.
Preferably, the dividing wall is in an H shape or a straight shape, the halogen storage layer is divided into more than two halogen collecting blocks, two adjacent halogen collecting blocks share one side wall, all the gas compression wells are arranged in the central area of the lake, and all the halogen discharge wells are arranged in the edge area of the lake.
According to another aspect of the present invention, there is provided a construction method of the above-mentioned closed underground brine mining system, including: forming a partition wall between the first waterproof layer and the second waterproof layer, wherein the partition wall, the first waterproof layer, the second waterproof layer and the waterproof dam are combined to form separation and trap of the brine storage layer, and the brine storage layer is divided into more than two brine mining blocks; all the gas injection wells of the brine collection block are arranged in the central area of the lake, and all the brine discharge wells are arranged in the edge area of the lake.
Preferably, the step of forming the partition wall between the first and second water barriers comprises: drilling through the salt formation and the first water barrier using a drilling rig to form a grouting orifice; placing a grouting hole sleeve in the grouting hole, and solidifying the grouting hole sleeve by using cement to tightly connect the grouting hole sleeve and the salt rock layer; drilling in the grouting hole casing until the grouting hole reaches a second water-resisting layer to form a grouting hole; drilling a grout outlet on the grouting pipe, and winding a screen on the pipe wall of the grout outlet to form a grouting screen pipe; placing a grouting pipe in the grouting hole, so that the grouting pipe is connected with a ground grouting pump after being fixed with the grouting hole sleeve; injecting a cementing material into the grouting pipe, so that the cementing material fills the pores of the halogen storage layer and forms a columnar body; determining the distance between the next grouting holes according to the sectional area of the formed columnar body; and (5) constructing the next grouting hole, and repeating the steps until a continuous closed partition wall is formed.
Preferably, the step of constructing the water-insulation dam outside the brine discharge well of the brine extraction block close to the edge of the lake comprises the following steps: and excavating a salt lake surface salt rock layer on the periphery of the brine discharge well positioned in the brine extraction block, vertically excavating through the first water-resisting layer and the brine storage layer, removing salt rock and sand in the foundation trench, filling clay, connecting the top of the base trench with the salt rock layer, and connecting the lower part of the base trench with the second water-resisting layer.
This closed underground brine mining system utilizes the divider wall, first water barrier, second water barrier and water proof dam combination have formed and have separated and trap to storing the halitum, thereby in carrying out the brine mining process, can extrude and the mode of replacement to brine through the air-compressing well air-injection, and utilize and seal the halitum and prevent that gas and brine from leaking, make gas can concentrate the halitum that is located to adopt the halitum, the brine extrusion in storing the halitum in adopting the halitum in the halitum is discharged to the halitum well of discharging, then carry the bittern mining system in salt pan or grit chamber, because gas pressure concentrates, the flow direction is concentrated, consequently, can make the brine flow direction concentrate, not only can improve the brine velocity of flow, and can increase the brine flow, reduce the brine mining degree of difficulty.
Drawings
FIG. 1 is a schematic plan view of a in-line and H-type brine recovery block in a closed underground brine recovery system in accordance with an embodiment of the present invention;
FIG. 2 is a schematic longitudinal cross-sectional view of a closed underground brine mining system for salt lakes in accordance with an embodiment of the present invention, taken along line A-A' of the linear and brine mining block shown in FIG. 1;
FIG. 3 is a schematic longitudinal cross-sectional view of a salt lake enclosed underground brine mining system of an embodiment of the present invention taken along line B-B' of the H-type brine mining block shown in FIG. 1;
FIG. 4 is a schematic cross-sectional view of a continuous divider wall formed by drilling grouting in a closed underground brine mining system in accordance with an embodiment of the present invention.
The reference numerals are represented as:
1. a first water-barrier layer; 2. a halogen storage layer; 3. a second water-barrier layer; 4. a salt rock formation; 5. grouting pump; 6. pressing a gas well; 61. a gas compressing wellhead; 62. a gas well casing; 63. pressing the air pipe; 631. an air compressing sieve tube; 7. an air compressor; 8. a dividing wall; 9. grouting holes; 91. an orifice; 92. grouting a hole sleeve; 93. a grouting pipe; 931. grouting a sieve tube; 10. discharging the brine well; 101. discharging brine from the wellhead; 102. discharging a brine well casing; 103. a brine discharge pipe; 1031. a brine discharge sieve tube; 11. a water-proof dam.
Detailed Description
Referring to fig. 1 to 4, the enclosed underground brine mining system for salt lake according to the embodiment of the present invention is shown in overall schematic view.
Referring to fig. 1, schematic plan views of in-line and H-type brine mining blocks in a closed underground brine mining system according to an embodiment of the present invention are shown. The system separates and encloses the brine storage layer between a first water-resisting layer and a second water-resisting layer by utilizing a separation wall 8 formed by a manual drilling curtain, a rotary drilling and a rotary spraying and a water-resisting dam 11 filled with a groove on the brine storage layer between two or more than two naturally deposited water-resisting layers in a salt lake, gas compression wells 6 are arranged at the positions, close to the center of the lake, of the enclosed spaces, and brine discharge wells 10 are arranged at the positions, close to the edge of the lake; meanwhile, a manual partition wall 8 is implemented at the central position of the lake in the opposite direction of the brine discharge well 10, a gas compression well 6 is constructed at a proper position of the partition wall 8 towards the periphery of the lake, high-pressure gas is pressed into a brine storage layer, so that brine in the brine storage layer is extruded by air and fills pores, the brine contained in the brine storage layer is discharged from the brine discharge well 10, and then the brine is conveyed to a salt field.
The dividing wall 8 is a continuous curtain wall formed by drilling and grouting, the dividing wall 8 is H-shaped or straight, a halogen storage layer is divided into more than two halogen collecting blocks, two adjacent halogen collecting blocks share one side wall, all the gas injection wells 6 are arranged in the central area of the lake, and all the halogen discharge wells 9 are arranged in the edge area of the lake.
Referring to fig. 2, a schematic longitudinal section along line a-a' of the linear and halogen recovery block shown in fig. 1 is shown for a closed underground brine recovery system for a salt lake according to an embodiment of the present invention. The closed underground brine mining system comprises a brine storage layer 2, a separation wall 8 and a water-stop dam 11, wherein the brine storage layer 2 is positioned between two or more than two naturally deposited water- stop layers 1 and 3 in a salt lake, the separation wall 8 is formed by utilizing a manual drilling curtain, a rotary drilling and a rotary spraying, the water-stop dam 11 is filled in a groove, the brine storage layer 2 between the first water-stop layer 1 and the second water-stop layer 3 is separated and enclosed, gas compression wells 6 are arranged in the enclosed spaces close to the center of the lake, and brine discharge wells 10 are arranged in the positions close to the edges of the lake; meanwhile, a manual partition wall 8 is implemented at the central position of the lake in the opposite direction of the brine discharge well 10, a pressure gas well 6 is constructed at a proper position of the partition wall 8 towards the periphery of the lake, a pressure gas pipe 63 is placed in the pressure gas well 6, the pressure gas pipe 63 is connected with an air compressor 7 on the ground, the brine discharge well 10 is constructed at the inner side of a water-stop dam 11 at the edge of the lake, and a brine discharge pipe 103 is arranged in the brine discharge well 10; the high-pressure gas is pressed into the brine storage layer 2 through the air pressing pipe 63, so that the brine in the brine storage layer 2 is extruded by the air and fills the pores, the brine contained in the brine storage layer 2 is discharged from the brine discharge pipe 103 of the brine discharge well 10, and then the brine is conveyed to the salt field.
Specifically, according to the embodiment of the invention and fig. 2, the closed underground brine mining system comprises a gas compressing device, a first water-resisting layer 1, a second water-resisting layer 3, a brine storage layer 2 positioned between the first water-resisting layer 1 and the second water-resisting layer 3, a partition wall 8, a brine discharge well 10 and a water-resisting dam 11.
Wherein, the air compressing device consists of an air compressor 7, an air compressing well 6 and an air compressing pipe 63.
Referring to fig. 3, a schematic longitudinal section along line B-B' of the H-type bittern collection block shown in fig. 1 is shown in the enclosed underground bittern collection system of salt lake according to the embodiment of the present application. The utility model provides a closed underground brine mining system utilizes division wall 8 to cut apart and enclose into the enclosure space with storing steamed layer 2 through water barrier 1, water barrier 3 and water proof dam 11, division wall 8 be the continuous curtain wall that drilling slip casting formed, the upper end extends to first water barrier 1, the lower extreme extends to second water barrier 3. The dividing wall 8 is combined with the first water-resisting layer 1, the second water-resisting layer 3 and the water-resisting dam 11 to divide the brine storage layer 2 into a plurality of closed spaces.
The closed space is a halogen extracting block, a pressure gas well 6 is arranged close to the center of the lake, a halogen discharging well 10 is arranged close to the edge of the lake.
As shown in fig. 1, a pressure gas well 6 is arranged in each brine production block, and a brine discharge well 10 is arranged near the lake edge of the brine production block. The gas compression well 6 is connected with an air compressor 7, high-pressure gas is input from the gas compression well, the gas passes through the brine storage layer 2, brine in the brine storage layer 2 is extruded and flows to the brine discharge well 10 to be discharged, a water separation dam 11 is filled at the periphery of the brine discharge well 10, and the brine is output to a salt field or a sand basin through a brine discharge pipeline.
As shown in figures 1, 2 and 3, the invention is characterized in that the separation walls 8 formed by a water-proof layer formed by natural deposition and a manual drilling curtain are connected with each other, and the separation walls can be a combination of 1-3 rows of a plurality of columnar bodies and/or a separation wall formed by rotary digging and/or rotary spraying. The cross-sectional shape of the partition wall 8 may be rectangular, oval, preferably curved, in-line, or other shapes, and in this embodiment, the cross-sectional shape of the partition wall 8 is rectangular or semi-curved.
In the present invention, the partition wall 8 includes a plurality of columnar bodies which are arranged side by side in sequence and connected to each other, thereby forming a continuous partition wall 8. The division wall can be a combination of 1-3 rows of a plurality of columnar bodies, and/or a water-stop wall formed by rotary drilling and/or rotary spraying.
The filling material adopted by the columnar body is a cementing material, so that the effects of effectively sealing pores and cementing sand grains can be achieved, brine is effectively prevented from flowing outwards under the action of pressure, and the brine collection efficiency is improved. The cementing material comprises magnesium oxide, magnesium chloride and water, and the composition of the cementing material comprises but is not limited to magnesium hydroxide, magnesium sulfate and brine which are mixed in different proportions.
Referring to fig. 3, in the present embodiment, the dividing wall 8, the first water-resisting layer 1, the second water-resisting layer 3 and the water-resisting dam 11 divide the brine storage layer 2 into a plurality of closed spaces, the closed spaces are provided with a pressure gas well 6 near the center of the lake, and a brine discharge well 10 near the edge of the lake, and the closed spaces form brine production blocks.
The plurality of dividing walls 8 are continuously arranged, the brine storage layer is divided into more than two brine collection blocks, and two adjacent brine collection blocks share one side wall, so that the work amount of the dividing walls 8 can be reduced, and the construction cost can be reduced.
Referring to fig. 2, the gas compressing well 6 and the brine discharging well 10 are both positioned in the brine storage layer 2, the gas compressing pipe 63 vertically extends into the brine storage layer 2, and the brine discharging pipe 103 also extends into the brine storage layer 2, and the two are communicated through the brine storage layer 2.
Thus, the closed underground brine mining system of the invention utilizes the partition wall 8, the brine discharge well 10, the first water-resisting layer 1, the second water-resisting layer 3 and the water-resisting dam 11 to form the closing and the separation of the brine storage layer, so that in the brine mining process, the brine is extruded and replaced by injecting air into the air injection well 6, and the gas is prevented from leaking out by utilizing the closed brine storage layer, so that the gas can intensively act on the brine storage layer 2 in the brine mining block, the brine in the brine storage layer 2 in the brine mining block is extruded and discharged to the brine discharge well 10, the brine is discharged through the brine discharge pipe 103 and then is conveyed to the brine mining system of the brine field, because the brine mining block is closed, the gas pressure in the brine mining block is concentrated, the flow direction is concentrated, the brine flow direction of the brine in the brine storage layer 2 can be the same, the brine flow rate can be improved, the brine flow can be increased, and the brine mining difficulty can be reduced, particularly for salt lakes with lake surface water, the dilemma that the brine extraction channel is difficult to excavate and the brine in the deep part is difficult to extract is solved.
As shown in fig. 2 and 3, the dividing wall 8 divides and traps the brine storage layer 2 below the surface salt rock layer 4 of the salt lake to be mined, and squeezes and replaces the brine by filling air into the air compressing well 6, so that the brine is squeezed into the brine discharge well 10, discharged to the ground through the brine discharge pipe 103, and then conveyed to a brine mining system of the salt lake.
Referring to fig. 2, the brine discharge well 10 is arranged at the edge of a lake of a brine mining block, the brine discharge well 10 vertically penetrates through the first water-resisting layer 1 and the brine storage layer 2 and extends to the second water-resisting layer 3, a brine discharge pipe 103 is arranged in the brine discharge well 10, and the brine discharge pipe 103 extends to the bottom of the brine discharge well 10, so that brine is discharged conveniently. The brine discharge well 10 should be spaced from the dividing wall 8 by a suitable distance that is the maximum distance that air can force the discharged brine to flow quickly to the brine discharge well 10.
As shown in fig. 2, the compressor device includes an air compressor 7, a gas well 6 and a gas compressing pipe 63. The plurality of gas compression wells 6 are arranged in the brine extraction block, the air compressor 7 conveys high-pressure gas to the plurality of gas compression wells 6 through the gas compression pipes 63, and the plurality of gas compression wells 6 are connected with the air compressor 7 after being connected with each other through the gas compression pipes 63.
The gas compression well 6 is arranged at a position, close to the center of a lake, of the brine production block, the gas compression well 6 vertically penetrates through the whole brine storage layer 2, a gas compression well head 61 of the gas compression well 6 is provided with a gas compression well casing 62, and the gas compression well casing 62 extends from the ground surface to the upper surface of the brine storage layer 2.
The brine discharge well 10 is arranged in the area of the lake edge, when gas enters the bottom of the brine storage layer 2, the gas flows from bottom to top and from the center of the lake to the lake edge under the pressure, brine is squeezed from the area far away from the center of the lake to the area close to the lake edge in the gas flowing process, and therefore the brine in the brine collection area of the brine storage layer 2 is squeezed by the gas to the brine discharge pipe 103 of the brine discharge well 10 to be discharged to brine conveying equipment to be conveyed to a brine field.
The compressed air pipe 63 is placed in the compressed air well 6, the compressed air pipe 63 extends into the bottom of the compressed air well 6, the lower pipe wall of the compressed air pipe 63 is provided with an air injection hole, the pipe wall of the air injection hole is wound with a screen to form a compressed air screen pipe 631, and the compressed air pipe 63 is fixedly connected with the compressed air well casing pipe 62 and then is connected with the air compressor 7 on the ground.
The gas compression well 6 conveys high-pressure gas to the bottom of the brine storage layer 2 through a gas compression pipe 63, the gas compression pipe 63 vertically extends into the brine storage layer 2 of the brine production block, as shown in fig. 2, the gas compression well 6 extends to the bottom of the brine storage layer 2, the gas compression pipe 63 extends into the bottom of the gas compression well 6, the brine discharge well 10 is positioned at the edge of the lake, the brine discharge well 10 extends to the bottom of the brine storage layer 2, the brine discharge well 10 is positioned in the brine discharge well 10 and extends to the bottom of the well, the brine storage layer 2 in which the brine discharge well 10 is positioned is buried shallowest and thinnest, so that the brine storage layer 2 which is gradually increased from the center to the edge and gradually becomes thinner is formed, the gas flows from the high-pressure area to the low-pressure area and from the low position to the high position, therefore, the gas compression pipe 63 can release gas pressure from the bottom of the brine storage layer 2, so that brine in the brine storage layer 2 can flow from the center to the periphery upwards under the gas pressure and then is discharged to the brine discharge pipe or the brine production zone through the gas discharge pipe 103 of the, thereby further improving brine extrusion efficiency and brine collection efficiency and improving brine collection quantity.
The system can be suitable for salt lakes with the surface salt rock layer brine being exploited completely or the surface layer having a large amount of lake surface water, and is especially suitable for exploiting the brine of the loose and easily collapsed brine storage layer below the salt rock layer 4 of the salt lake surface with low porosity, low permeability and low water supply rate, the salt-containing fine sand layer, the silt sand layer and the like, so that the brine exploiting cost can be reduced, the brine exploiting amount can be greatly improved, the mining efficiency is improved, and the recovery ratio is improved.
Preferably, as shown in fig. 1, in order to further improve the brine recovery effect, a plurality of pressure gas wells 6 may be disposed in the brine recovery block near the central area of the lake, and a plurality of brine discharge wells 10 may be disposed in the peripheral area of the lake, so that the brine in the area can be wholly squeezed from the center to the edge and from the deep part to the shallow part, thereby further improving the brine collection efficiency and increasing the brine recovery amount.
As shown in fig. 2, a gas well head 61 of a gas well 6 is provided with a gas well casing 62, the gas well casing 62 extends from the ground surface to the upper surface of the halogen storage layer 2 and is solidified in the salt rock layer by using a magnesium-based cementing material, a gas compression pipe 63 is placed in the gas well casing 62, the lower section pipe wall of the gas compression pipe 63 is provided with gas injection holes, and the pipe wall with the holes is wound with a screen, so that a screen pipe structure is formed, and the pipeline is prevented from being blocked by sand. The gas compression pipe 63 can be connected and reinforced by the gas compression well casing pipe 62, the salt rock stratum 4 is arranged at the position where the gas compression well casing pipe 62 is arranged, the salt rock stratum 4 is stable and high in strength, and the gas compression well casing pipe 62 is tightly connected with the salt rock on the outer peripheral side to play a role in protecting the well wall and fixing the gas compression pipe 63, so that the reliability and the stability of the structural integrity of the gas compression well 6 are ensured.
The gas compression well 6 is arranged inside the dividing wall 8 at a position selected taking into account the diffusion radius of the slurry during the grouting step, which is mainly related to the grouting pressure, the formation porosity and the formation lithology.
As shown in fig. 2, a brine discharge well casing 102 is arranged at a brine discharge well mouth 101 of the brine discharge well 10, the brine discharge well casing 102 extends from the ground surface to the upper surface of the brine storage layer 2 and is consolidated in the salt formation by using a magnesium-based cementing material, a brine discharge pipe 103 is arranged in the brine discharge well casing 102, the brine discharge pipe 103 extends to the bottom of the brine discharge well 10, a brine inlet hole is formed in the lower pipe wall of the brine discharge pipe 103, a screen mesh is wound on the pipe wall of the brine inlet hole to form a brine discharge screen 1031, and the brine discharge pipe 103 is fixedly connected with the brine discharge well casing 102.
The lower pipe wall of the brine discharge pipe 103 is provided with brine inlet holes, and the pipe wall with the holes is wound with a screen, so that a screen pipe structure is formed, and the brine inlet is prevented from being blocked by silt and salt chips. The brine discharge pipe 103 is connected and reinforced by the brine discharge well casing 102, the brine discharge well casing 102 is arranged at the position of the salt rock stratum 4, the salt rock stratum 4 is stable and high in strength, and the brine discharge well casing 102 is tightly connected with the salt rock on the outer peripheral side, so that the well wall is protected, the brine discharge pipe 103 is fixed, and the reliability and the stability of the integral performance of the brine discharge well 10 are guaranteed.
According to an embodiment of the invention, the construction method of the closed underground brine mining system comprises the following steps: forming a partition wall 8 between the first waterproof layer 1 and the second waterproof layer 3, wherein the partition wall 8, the first waterproof layer 1, the second waterproof layer 3 and the water-stop dam 11 are combined to form separation and enclosure of the brine storage layer, and the brine storage layer is divided into more than two brine mining blocks; a pressure gas well 6 is arranged on the brine extraction block close to the center of a lake, a brine discharge well 10 is arranged on the inner side of a water-stop dam close to the edge of the lake, and the pressure gas well 6 and the brine discharge well 10 vertically extend to a brine storage layer 2, so that the pressure gas well and the brine discharge well can be connected with each other through brine in the brine storage layer 2 to form a brine flow channel, and brine flows from a lower position to a higher position from the center area of the lake to the brine discharge hole 10 at the edge of the lake.
FIG. 4 is a schematic cross-sectional view of a continuous divider wall formed by grouting in a closed sub-surface brine mining system according to an embodiment of the present invention. The step of forming the partition wall 8 between the first and second water barriers includes: drilling through the salt formation 4 and the first water barrier 1 using a drilling rig, forming a grouting orifice 91; placing a grouting hole sleeve 92 in the grouting hole 91, and solidifying the grouting hole sleeve 92 by using cement to tightly connect the grouting hole sleeve 92 and the salt rock layer 4 together; drilling in the grouting hole casing 92 until reaching the second water-resisting layer 3 to form a grouting hole 9; drilling a grout outlet on the grout pipe 93, and winding a screen on the wall of the grout outlet 93 to form a grout screen pipe 931; placing a grouting pipe 93 in the grouting hole 9, so that the grouting pipe 93 is connected with the ground grouting pump 5 after being fixed with the grouting hole sleeve 92; injecting a cementing material into the grouting pipe 93 by using a grouting pump 5, so that the cementing material fills the pores of the halogen storage layer 2 and forms a columnar body; determining the distance between the next grouting holes 9 according to the sectional area of the formed columnar body; and (5) constructing the next grouting hole 9, and the like until a continuous closed partition wall is formed.
The dividing wall 8 is formed by adopting a grouting mode, and compared with the deep halogen storage layer 2, the required workload of excavating foundation trench to fill clay is small, the forming structure is simple, the realization is easy, the operability is strong, and an effective closed structure can be formed.
The step of arranging the gas well 6 in the halogen storage layer 2 of the halogen extracting block comprises the following steps: drilling through the salt formation 4 and the first water barrier 1 using a drilling rig to form a puffer wellhead 61; placing and consolidating a puffer casing 62 in a puffer wellhead 61; drilling in the gas well casing 62 to the bottom of the halogen storage layer 2 to form a gas well 6; placing a gas compressing pipe 63 in the gas compressing well 6, and enabling the lower section of the gas compressing pipe 63 to form a gas compressing screen pipe 631 and extend to the bottom of the well; the air pressing pipe 63 and the air pressing well casing pipe 62 are fixed and then connected with the air compressor 7.
The step of arranging the brine discharge well 10 in the brine storage layer 2 of the brine extraction block comprises the following steps: drilling through a salt rock stratum 4 and a first water-resisting layer 1 on the inner side of a lake edge water-resisting dam by using a drilling machine to form a row of brine discharge brine well mouths 101; placing and consolidating a brine discharge well casing 102 in a brine discharge and brine discharge well head 101; drilling in the halogen discharging well casing pipe 102 to the bottom of the halogen storage layer 2 to form a halogen discharging well 6; placing a gas compressing pipe 103 in the brine discharge well 10, and enabling the lower section of the brine discharge pipe 103 to form a brine discharge screen 1031 and extend to the bottom of the well; the discharge pipe 103 is fixed to the discharge well casing 102 and extended for connection to the associated halogen transportation facility.
The closed underground brine mining system and the construction method have the advantages that the process is simple, rapid and efficient, and particularly for deep brine layers below salt rock layers on the surface layers of salt lakes with lake surface water, the brine mining amount can be greatly improved, the mining efficiency is improved, and the recovery ratio is increased.
It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A closed underground brine mining system comprises a gas compressing device, a first water-resisting layer (1), a second water-resisting layer (3), a brine storage layer (2) positioned between the first water-resisting layer (1) and the second water-resisting layer (3), a partition wall (8), a brine discharge well (10) and a water-resisting dam (11); it is characterized in that the preparation method is characterized in that,
the dividing wall (8) is a continuous curtain wall formed by drilling and grouting, the upper end of the dividing wall (8) extends to the first waterproof layer (1), the lower end of the dividing wall (8) extends to the second waterproof layer (3), and the dividing wall (8), the first waterproof layer (1), the second waterproof layer (3) and the water-proof dam (11) divide the halogen storage layer (2) into a plurality of closed spaces;
the closed space is provided with a pressure gas well (6) close to the center of the lake, a brine discharge well (10) close to the edge of the lake is arranged in the closed space, and the closed space forms a brine extraction block;
the device is characterized in that a pressure gas well (6) is arranged in each brine extraction block, a brine discharge well (10) is arranged on the brine extraction block close to the lake edge, the pressure gas well (6) is connected with an air compressor (7), high-pressure gas is input from the pressure gas well, the gas passes through a brine storage layer (2), brine in the brine storage layer (2) is extruded and flows to the brine discharge well (10) to be discharged, and the brine is conveyed to a salt field or a sand basin through a brine discharge pipeline.
2. The closed underground brine mining system according to claim 1, wherein the gas compressing device is composed of an air compressor (7), a gas compressing well (6) and a gas compressing pipe (63), a plurality of gas compressing wells (6) are arranged in the brine mining area, the air compressor (7) transmits high-pressure gas to the plurality of gas compressing wells (6) through the gas compressing pipe (63), and the plurality of gas compressing wells (6) are connected with the air compressor (7) after being connected with each other through the gas compressing pipe (63).
3. A closed underground brine mining system according to claim 2, characterized in that the gas well (6) is arranged in the brine mining block near the center of the lake, the gas well (6) extends vertically through the whole brine storage layer (2), and the gas well head (61) of the gas well (6) is provided with a gas well casing (62), the gas well casing (62) extending from the surface to the upper surface of the brine storage layer (2).
4. The closed underground brine mining system according to claim 3, wherein a gas compression pipe (63) is placed in the gas compression well (6), the gas compression pipe (63) extends to the bottom of the gas compression well (6), an air injection hole is formed in the lower pipe wall of the gas compression pipe (63), a screen is wound on the pipe wall of the air injection hole to form a gas compression screen pipe (631), and the gas compression pipe (63) is fixedly connected with the gas compression well casing pipe (62) and then connected with an air compressor (7) on the ground.
5. The closed underground brine mining system of claim 1, wherein a brine discharge well opening (101) of the brine discharge well (10) is provided with a brine discharge well casing (102), a brine discharge pipe (103) is placed in the brine discharge well casing (102), the brine discharge pipe (103) extends to the bottom of the brine discharge well (10), a brine inlet hole is formed in the lower section pipe wall of the brine discharge pipe (103), a screen mesh is wound on the pipe wall of the brine inlet hole to form an air compression screen pipe (1031), and the brine discharge pipe (103) is fixedly connected with the brine discharge well casing (102).
6. A closed underground brine mining system according to claim 1, wherein the dividing wall (8) is a continuous curtain wall formed by drilling and grouting, the dividing wall (8) is H-shaped or straight, the brine storage layer (2) is divided into more than two brine mining blocks, two adjacent brine mining blocks share one side wall, all the pressure gas wells (6) are arranged in the central area of the lake, and all the brine discharge wells (9) are arranged in the edge area of the lake.
7. A closed underground brine mining system according to claim 1, characterized in that the dividing wall (8) comprises a plurality of columns arranged side by side in sequence and connected to each other, and the dividing wall (8) can be a combination of 1 to 3 rows of columns, and/or a water-separating wall formed by rotary excavation and/or rotary spraying.
8. The closed underground brine mining system of claim 7,
the dividing wall (8), the first water-resisting layer (1), the second water-resisting layer (3) and the water-resisting dam (11) divide the brine storage layer (2) into a plurality of closed spaces, a pressure gas well (6) is arranged in the closed space close to the center of the lake, a brine discharge well (10) is arranged in the position close to the edge of the lake, and the closed spaces form brine extraction blocks.
9. A construction method of a closed underground brine mining system comprises the following steps:
forming a partition wall (8) between the first water-resisting layer (1) and the second water-resisting layer (3), wherein the partition wall (8) is combined with the first water-resisting layer (1), the second water-resisting layer (3) and the water-resisting dam (11) to form partition and enclosure of the brine storage layer, and the brine storage layer is divided into more than two brine-extracting blocks;
a pressure gas well (6) is arranged at the position, close to the center of the lake, of the brine collection block, a brine discharge well (10) is arranged at the position, close to the edge of the lake, of the brine collection block, and a water insulation dam (11) is arranged on the periphery of the brine discharge well.
10. The method of claim 9, wherein the step of forming a dividing wall between the first and second water barriers comprises:
drilling through the salt formation (4) and the first water barrier (1) using a drilling rig, forming a grouting orifice (91);
placing a grouting hole sleeve (92) in the grouting hole (91), and solidifying the grouting hole sleeve (92) by using cement to tightly connect the grouting hole sleeve (92) and the salt rock stratum together;
drilling in the grouting hole casing pipe (92) until reaching the second water-resisting layer (3) to form a grouting hole (9);
drilling grouting holes on the grouting pipe (93), and winding a screen on the wall of the drilled hole to form a grouting screen pipe (931);
a grouting pipe (93) is placed in the grouting hole (9), so that the grouting pipe (93) is connected with the ground grouting pump (5) after being fixed with the grouting hole sleeve (92);
injecting a cementing material into the grouting pipe (93), so that the cementing material fills the pores of the halogen storage layer (2) and forms a columnar body;
determining the distance between the next grouting holes (9) according to the sectional area of the formed columnar body;
the construction of the next grouting hole (9) is carried out,
and so on until a continuous closed dividing wall (8) is formed.
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| CN112253117A (en) * | 2020-10-15 | 2021-01-22 | 中国科学院青海盐湖研究所 | Method for exploiting polyhalite in salt lake |
| CN112459752A (en) * | 2020-11-15 | 2021-03-09 | 五矿盐湖有限公司 | Method for determining air driving distance in air driving halogen extraction method |
| CN112302533A (en) * | 2020-11-18 | 2021-02-02 | 青海凹口凸钾镁盐技术有限公司 | Construction method of gas injection hole |
| CN112627796A (en) * | 2020-12-22 | 2021-04-09 | 五矿盐湖有限公司 | Construction method of brine mining channel system |
| CN112647907A (en) * | 2020-12-22 | 2021-04-13 | 五矿盐湖有限公司 | Mining method for brine mine with low porosity, low water supply degree and low permeability |
| CN115142817A (en) * | 2021-03-30 | 2022-10-04 | 中国石油化工股份有限公司 | Anti-crystallization gas injection and brine discharge pipe column structure and method and salt cavern gas storage |
| CN115142817B (en) * | 2021-03-30 | 2024-04-09 | 中国石油化工股份有限公司 | Crystallization-preventing gas injection and brine discharge tubular column structure, method and salt cavern gas storage |
| CN115370344A (en) * | 2022-08-01 | 2022-11-22 | 国投新疆罗布泊钾盐有限责任公司 | Salt lake underground brine collecting system and construction method thereof |
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Effective date of registration: 20210401 Address after: Jincheng Jiayuan, No.6 Yanhu lane, Chengxi District, Xining City, Qinghai Province Applicant after: Qinghai concave convex potassium magnesium salt Technology Co.,Ltd. Address before: Jincheng Jiayuan, No.6 Yanhu lane, Chengxi District, Xining City, Qinghai Province Applicant before: Shan Junjie |
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