CN115370344A - Salt lake underground brine collecting system and construction method thereof - Google Patents
Salt lake underground brine collecting system and construction method thereof Download PDFInfo
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- CN115370344A CN115370344A CN202210919796.5A CN202210919796A CN115370344A CN 115370344 A CN115370344 A CN 115370344A CN 202210919796 A CN202210919796 A CN 202210919796A CN 115370344 A CN115370344 A CN 115370344A
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- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 title claims abstract description 204
- 239000012267 brine Substances 0.000 title claims abstract description 203
- 238000010276 construction Methods 0.000 title claims abstract description 30
- 238000005065 mining Methods 0.000 claims abstract description 43
- 241001131796 Botaurus stellaris Species 0.000 claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 claims description 26
- 238000000605 extraction Methods 0.000 claims description 23
- 238000005553 drilling Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 4
- 238000011010 flushing procedure Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 21
- 238000011084 recovery Methods 0.000 abstract description 13
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 239000013049 sediment Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910052736 halogen Inorganic materials 0.000 description 4
- 150000002367 halogens Chemical class 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 239000011148 porous material Substances 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000001103 potassium chloride Substances 0.000 description 2
- 235000011164 potassium chloride Nutrition 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 241000722949 Apocynum Species 0.000 description 1
- 241001415830 Bubo Species 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
- 230000004888 barrier function Effects 0.000 description 1
- 208000016335 bubo Diseases 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000035515 penetration Effects 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
- 230000008569 process Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
Images
Classifications
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- 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
- E21B43/28—Dissolving minerals other than hydrocarbons, e.g. by an alkaline or acid leaching agent
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- 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
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
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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 discloses an underground bittern-collecting system for a salt lake, which comprises a bittern-collecting well, a vertical well and a horizontal well, wherein a horizontal section of the horizontal well is arranged on a bittern layer at the lower part of the underground part of the salt lake, the vertical well extending downwards vertically is communicated with the horizontal section, the vertical well can be communicated with each pressure-bearing bittern layer vertically, the hydraulic connection of each bittern layer is increased, so that bittern in the upper pressure-bearing bittern layer can not seep into the bittern-collecting well through a stratum but can converge into the horizontal section from top to bottom, the horizontal section forms a dominant water-guiding gallery, and the converged bittern forms a pipeline-like flow to be input into the bittern-collecting well. The invention also provides a construction method of the salt lake underground brine-mining system, which comprises the steps of constructing the vertical well, and then constructing the horizontal well, so that the horizontal well is communicated with the vertical well. The vertical well and the horizontal well are matched, so that the runoff speed of underground water is increased, the brine discharge capacity of the conventional brine mining engineering is improved, the service life of brine mining equipment is prolonged, and the recovery rate of underground brine resources is improved.
Description
Technical Field
The invention relates to the technical field of brine mining, in particular to an underground brine mining system for a salt lake and a construction method thereof.
Background
Modern salt lake liquid sylvite resources in China play an important role in the production of potash fertilizers as main sylvite ore types. The salt lake underground brine is mainly contained in intercrystalline pores of salt sediment layers deposited in the development and evolution of the salt lake, and due to the change of the salt lake underground sediment environment, a plurality of salt sediment layers and clay fragment sediment layers are deposited in the salt lake underground, so that an upper layer of latent brine aquifer and a lower layer of pressure-bearing brine aquifer are formed, a water-bearing layer group is formed, and from top to bottom, the tendency that intercrystalline pores become small, hydraulic connection becomes poor and water-rich performance becomes weak exists. At the initial stage of mine production, salt lake mine enterprises mainly adopt brine extraction channels and vertical brine extraction wells to extract brine at present according to the difference of different salt lake geological structures and hydrogeological conditions.
The bittern collecting channel is mainly suitable for underground bittern layers which are buried shallow (the water level is less than 12 meters generally), have good water-rich property and better supply condition, such as the Carlo salt lake. The brine collecting well is suitable for salt lakes such as apocynum salt lakes where the brine is deeply buried at the dynamic water level (the dynamic water level is more than 12 meters during the mining) and is drained for mining.
Along with the long-term large-scale extraction of underground brine, the brine consumption of a submerged brine layer on the upper part of a salt lake is huge, the water level of the brine is continuously reduced, the thickness of the brine layer on the upper part is thinned, the two brine extraction modes have the condition that the brine extraction capacity is continuously reduced, and the brine extraction mode by using a vertical brine extraction well is particularly obvious. Taking Luo Bubo salt lake as an example, the brine production amount of each brine production well is reduced by 10% -15% every year along with the thinning of the upper submerged brine layer since the production. The brine production capacity of the brine production well is not matched with the brine production capacity of equipment, and the brine production equipment needs to be replaced frequently. In order to maintain single-well brine-producing capacity and prolong service life of brine-producing equipment, the resource exploitation proportion of a lower pressure-bearing brine layer needs to be increased, the porosity of most of lower pressure-bearing brine layers is low, the water-rich property is poor, the brine-producing capacity of the single-well brine-producing equipment of the brine-producing equipment is far smaller than that of the single-well brine-producing equipment of the submerged brine layers, and even if the pumping depth is increased, brine of the lower brine layer is extracted, brine of a plurality of water-bearing layers is mixed and produced, due to the influence of factors such as small permeability coefficient and poor fluidity of deep brine layers, the brine far away from the brine-producing well needs to be supplied into the well for a long time, so that the brine-producing capacity of the brine-producing equipment cannot be greatly improved.
Meanwhile, the existing brine extraction engineering is mainly arranged in parallel to the brine conveying channel, and no brine extraction engineering is arranged in the direction vertical to the brine conveying channel, so that the influence of factors such as small permeability coefficient, poor flowability and the like of a lower pressure-bearing brine layer is caused, the hydraulic gradient of underground brine is small, the drainage funnel is small, effective drainage and exploitation cannot be carried out on a brine extraction-free engineering arrangement area, and the resource recovery rate is low. And partial areas are restricted by the function protection areas, and the newly added ground brine-collecting engineering is not allowed, so that the capital construction investment and the production cost can be greatly improved due to the influence of terrain conditions and ecological environment protection requirements even if the newly added ground brine-collecting and transporting engineering is allowed in the area without engineering arrangement.
Therefore, how to improve the brine discharge capacity of the brine mining engineering in the prior art, effectively mine each brine ore bed resource in the function protection area, prolong the service life of the brine mining equipment, and improve the recovery rate of the brine resource becomes a problem to be solved urgently by the technical staff in the field.
Disclosure of Invention
The invention aims to provide an underground brine mining system of a salt lake and a construction method thereof, which are used for solving the problems in the prior art, improving the brine production capacity of brine mining engineering, prolonging the service life of brine mining equipment, avoiding the restriction of protection requirements of functional areas, improving the underground brine resource recovery rate of non-engineering-layout areas and reducing the capital investment and production cost.
In order to achieve the purpose, the invention provides the following scheme: the invention provides an underground bittern collecting system for salt lake, comprising:
a brine production well capable of collecting brine;
the vertical wells extend downwards from the ground vertically, and the number of the vertical wells is at least one group;
the horizontal well comprises a horizontal section, the horizontal section is located on a brine layer on the lower portion of the underground of a salt lake, the vertical well is communicated with the horizontal section, and the horizontal section is further communicated with the brine extracting well.
Preferably, the vertical well is arranged parallel to the brine producing well, and the horizontal section is arranged perpendicular to the vertical well.
Preferably, the number of the vertical wells is multiple groups, the multiple groups of the vertical wells are sequentially arranged along the direction of the axis of the horizontal section, the direction of the axis of the horizontal section is gradually far away from the brine production well, and the multiple groups of the vertical wells are arranged in parallel and at equal intervals.
Preferably, the distance between one vertical well closest to the brine producing well and the brine producing well is equal to the distance between two adjacent vertical wells.
Preferably, the vertical well extends vertically down to below the floor of the lower brine layer beneath the salt lake.
Preferably, the horizontal well further comprises an inclined section, the inclined section extends to the brine layer below the salt lake from the ground along the direction gradually close to the brine extraction well in an inclined mode, the inclined section is communicated with the horizontal section, and the inclined section is arranged at one end or two ends of the horizontal section.
Preferably, the diameter of the horizontal section is larger than that of the vertical well, and the diameter of the horizontal section is smaller than that of the brine production well.
The invention also provides a construction method of the underground brine collection system of the salt lake, which comprises the following steps:
step one, constructing the vertical well;
and step two, constructing the horizontal well, and communicating the horizontal well with the vertical well and the brine extraction well.
Preferably, the vertical well construction adopts a drilling mode of firstly drilling an exploration hole and then reaming.
Preferably, after the horizontal well is constructed, the well wall of the horizontal well is flushed and washed by using pressurized brine.
Compared with the prior art, the invention has the following technical effects: according to the underground brine-mining system for the salt lake, the horizontal section of the horizontal well is arranged on the brine layer at the lower part of the underground salt lake, the vertical well extending vertically downwards is communicated with the horizontal section, the vertical well can be communicated with each pressure-bearing brine layer in the vertical direction, the hydraulic connection of each brine layer is increased, brine in the upper pressure-bearing brine layer is enabled not to flow into the brine-mining well through the stratum any more, but to flow into the horizontal section from top to bottom, the horizontal section forms a dominant water guiding gallery, and the collected brine forms a pipeline-like flow to be input into the brine-mining well; the invention also provides a construction method of the salt lake underground brine-mining system, which comprises the steps of constructing the vertical well, and then constructing the horizontal well, so that the horizontal well is communicated with the vertical well. The vertical well and the horizontal well are matched, so that the runoff speed of underground water is increased, the brine discharge amount of the existing brine mining engineering is increased, and the service life of brine mining equipment is prolonged.
Meanwhile, the invention also provides a construction method of the salt lake underground brine mining system, which comprises the steps of firstly constructing a vertical well, then constructing a horizontal well, so that the horizontal well is communicated with the vertical well, then guiding brine into the brine mining well by utilizing the horizontal well, forming a falling funnel by the vertical well, effectively draining the brine in a brine mining engineering arrangement area, solving the problems that the thickness of a brine ore layer is thinned, the hydraulic gradient of underground brine is reduced, the runoff speed of runoff is reduced, and the time required for supplying the underground brine far away from the brine mining well to the brine mining well is longer, effectively draining and mining the underground brine in an underground brine mining engineering arrangement area along the horizontal well or an underground brine in an area which cannot be arranged in a ground brine mining engineering area, and improving the recovery rate of underground brine resources.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural diagram of the underground bittern collecting system of salt lake.
Wherein, 1 is a brine extraction well, 2 is a vertical well, 3 is a horizontal well, 301 is a horizontal section, 302 is an inclined section, 4 is a brine transportation channel, 5 is a water-resisting layer, and 6 is a brine layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide an underground brine mining system of a salt lake and a construction method thereof, which are used for solving the problems in the prior art, improving the brine production capacity of brine mining engineering, prolonging the service life of brine mining equipment, avoiding the restriction of protection requirements of functional areas, improving the underground brine resource recovery rate of non-engineering-layout areas and reducing the capital investment and production cost.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1, fig. 1 is a schematic diagram showing the structure of the underground bittern collecting system of salt lake according to the present invention.
The invention provides an underground brine extraction system for a salt lake, which comprises a brine extraction well 1, vertical wells 2 and horizontal wells 3, wherein the brine extraction well 1 can collect brine, the vertical wells 2 vertically extend downwards from the ground, the number of the vertical wells 2 is at least one, each horizontal well 3 comprises a horizontal section 301, the horizontal section 301 is located on a brine layer 6 at the lower part of the underground salt lake, the vertical wells 2 are communicated with the horizontal sections 301, and the horizontal sections 301 are also communicated with the brine extraction well 1.
According to the underground brine-mining system for the salt lake, the horizontal section 301 of the horizontal well 3 is arranged on the brine layer 6 at the underground lower part of the salt lake, the vertical well 2 extending vertically downwards is communicated with the horizontal section 301, the vertical well 2 can be communicated with the pressure-bearing brine layers 6 in the vertical direction, the flowing mode that brine of the pressure-bearing brine layers 6 flows to the brine-mining well 1 through stratum seepage is changed, so that the brine is converged into the horizontal section 301 of the horizontal well 3 from top to bottom by utilizing the vertical well 2, the horizontal section 301 forms a dominant water diversion gallery, and the brine converged at the horizontal section 301 forms a similar pipeline flow and is input into the brine-mining well 1, so that the runoff resistance of underground water is greatly reduced, and the runoff velocity of the underground water is increased. According to the invention, the vertical well 2 and the horizontal well 3 are matched, so that the brine discharge amount of the existing brine mining engineering is increased, the service life of brine mining equipment is prolonged, brine in a brine mining engineering layout area or a brine mining engineering area which cannot be arranged is effectively drained and mined, and the brine resource recovery rate is increased. It should be noted that the brine extracting well 1 generally uses a pump body to transport brine outwards and transport the extracted brine to the brine transporting channel 4, which is a conventional means for those skilled in the art, and the present invention does not relate to the improvement of transporting brine outwards in the brine extracting well 1, and therefore, the description thereof is omitted here.
In this embodiment, the quantity of vertical well 2 is the multiunit, and multiunit vertical well 2 sets gradually towards the direction of keeping away from gradually adopting steamed well 1 along the axis direction of horizontal segment 301, and multiunit vertical well 2 forms multiunit descending funnel, carries out regional unwatering exploitation with the bittern that does not adopt steamed engineering arrangement region, and multiunit vertical well 2 is parallel and equidistant to be set up, further improves the extraction efficiency that does not have the regional bittern of adopting steamed engineering arrangement region, improves the volume of putting out bittern of adopting steamed engineering. It should be noted here that the distance between one vertical well 2 closest to the brine production well 1 and the brine production well 1 is equal to the distance between two adjacent vertical wells 2.
Specifically, vertical well 2 is vertical downwardly extending to the water barrier 5 of horizontal segment 301 lower part, and vertical well 2 extends to the bottom of horizontal segment 301 promptly, and the vertical well 2 part that is located the horizontal segment 301 bottom is the sedimentation section, plays the effect of sediment, prevents silting up and the jam that silt that the silt that groundwater carried when horizontal segment 301 flows caused, has improved the reliability of adopting the steamed system.
More specifically, in consideration of the actual construction needs of the system, the horizontal well 3 may further include a deflecting section 302, the deflecting section 302 extends from the ground to the brine layer 6 below the salt lake along a direction gradually approaching the brine extraction well 1 in an inclined manner, the deflecting section 302 is communicated with the horizontal section 301, the deflecting section 302 is disposed at one end or two ends of the horizontal section 301, and the actual construction may be started by the deflecting section 302, and the horizontal layer is drilled from the ground surface according to a certain penetration angle to reach the brine layer 6 below the salt lake. It should be noted here that, when the horizontal section 301 is provided with the deflecting section 302 near one end of the brine producing well 1, the deflecting section 302 may be set to be communicated with the brine producing well 1, that is, the deflecting section 302 is communicated with the horizontal section 301 by using the brine producing well 1, or the horizontal section 301 and the deflecting section 302 are also set on the other side of the brine producing well. It should be further noted that a plurality of groups of vertical wells 2 and horizontal wells 3 can be arranged around the brine production well 1, and the plurality of groups of vertical wells 2 and horizontal wells 3 are circumferentially arranged around the axis of the brine production well 1, so as to further improve the recovery rate of the high brine resources.
Wherein, the diameter of horizontal segment 301 is big than the diameter of vertical well 2, and the diameter of horizontal segment 301 is little than adopting the diameter of halogen well 1, ensures that the brine that collects flows into smoothly in adopting halogen well 1 at horizontal segment 301, avoids blockking up.
Further, the invention also provides a construction method of the salt lake underground brine recovery system, which comprises the steps of firstly constructing the vertical well 2, then constructing the horizontal well 3 on the brine layer 6 at the lower part of the salt lake underground, so that the horizontal well 3 is communicated with the vertical well 2, the vertical well 2 forms a falling funnel, effectively draining the brine in the non-brine recovery engineering arrangement area, and then guiding the brine into the brine recovery well 1 by using the horizontal well 3, so that the brine resource recovery rate is improved.
In the actual work progress, 2 construction in vertical well adopt the drilling mode of boring exploration hole earlier and reaming again, bore exploration hole coring, divide bittern layer 6, facilitate for 3 construction in horizontal well, reduce the construction degree of difficulty simultaneously.
It should be further noted that after the horizontal well 3 is constructed, pressurized brine is used for flushing the well wall of the horizontal well 3, so that the normal operation of a subsequent system is guaranteed.
The construction method of the underground brine mining system of the salt lake according to the present invention is further explained by the following specific examples.
Example one
The construction method of the underground brine collection system of the salt lake comprises the following steps:
1. vertical exploration hole of construction
The main purpose is to divide and compare the brine layer 6 and provide basis for determining the buried depth of the horizontal section 301 of the horizontal well 3. The method comprises the steps of taking a brine production well 1 as a starting point, arranging an exploration line, arranging vertical exploration holes in the brine production well 1 at intervals of 200-300 m, wherein the length of the exploration line is 1000-2000 m, constructing 5-10 exploration holes, the hole depth penetrates through a brine layer 6 at the lowest part, coring the whole hole, conducting geological logging on the collected rock core, describing and dividing lithology, buried depth, thickness and pore development conditions of the brine layer 6 in detail, drawing a column diagram of a drilled hole and an exploration line profile diagram, dividing, connecting and comparing brine layers 6 of different exploration holes, and determining the change characteristics of the thickness and buried depth of each brine layer 6 on a profile.
2. Construction of vertical shaft 2
The main purpose is to further strengthen the hydraulic connection between each brine layer 6 and the horizontal well 3, so that the brine at different layers can be converged into the horizontal well 3 to form a pipeline flow to flow into the brine recovery well 1. Reaming is carried out at the original vertical exploration hole position, the diameter of the reamed hole is 250-500 mm, one diameter reaches the end, a vertical well 2 is formed after the vertical exploration hole is reamed, the well depth of the vertical well 2 exceeds 10m of a target aquifer bottom plate to serve as a sediment section, the sediment effect is played, and sediment and blockage caused by silt carried when underground water flows in the horizontal section 301 are prevented.
3. Construction of horizontal well 3
The main purpose is to improve the connectivity of the target brine layer 6 and the hydraulic connection with the upper brine layer 6, form a preferential water guiding gallery and convert the groundwater runoff mode from seepage to pipeline-like flow. The horizontal well 3 is composed of a deflecting section 302 and a horizontal section 301, construction is carried out along an exploration line, the soil entry point of the horizontal well 3 is positioned at one end far away from the vertical well 2, drilling is carried out from the earth surface according to a certain soil entry angle, horizontal drilling is carried out after the designed layer (specifically, the lower brine layer 6 under the salt lake) is reached, the diameter of a drilled hole is 300-500 mm, the well is formed at one time, the hole is exposed, and no liner pipe is arranged. The designed horizon of the horizontal segment 301 is positioned in a target aquifer, the specific depth is determined at the middle position of the target aquifer according to the exploratory line profile, the length of the horizontal segment 301 is 1000-2000 m, and the track of the horizontal well 3 is required to pass through (or approach to the maximum extent) the constructed vertical well 2 and finally is communicated with the existing vertical well 2. The method is characterized in that a trenchless pipe-laying drilling machine is used for construction, a trenchless horizontal directional drilling steering system is used for accurate guiding, special mud is configured according to the geological structure and the engineering geological conditions of the main drilling layer for lubricating and discharging the drilling tool, and the horizontal well 3 is ensured to be communicated with the vertical well 2 finally.
4. Horizontal well 3 flushing
After the construction of the horizontal well 3 is finished, the horizontal well 3 is washed, mud skin attached to the well wall and drill cuttings in the well are washed away in the construction process of the horizontal well 3, the well wall is prevented from being blocked, and brine is prevented from flowing into the horizontal well 3. The well washing mode is as follows: each section of drill rod rubs the wall of the horizontal well 3 back and forth in a withdrawing-drilling mode, and pressurized brine (the water injection pressure is 3 MPa-5 MPa, and the flow is 1 m) is synchronously and continuously injected into the horizontal drill rod 3 /min～2m 3 Min), injected brine is at levelAnd the drill bit is gushed out from the drill bit under high-speed rotation to scour the wall of the horizontal well 3, and the slurry in the horizontal well 3 is diluted and replaced, so that the slurry in the horizontal well 3 flows into the brine extraction well 1 and is discharged under the drive of injected pressurized brine. Each section of drill rod is withdrawn and drilled for 2-3 times, and one drill rod can be put forward. And during the well washing of the horizontal well 3, sequentially putting the submerged halogen pumps into each vertical well 2 to pump water with the maximum capacity, pumping slurry in the wells in sections until brine pumped by the submerged halogen pumps is cleaned, and finishing the well washing.
The saline lake underground brine extracting system adopts the horizontal well 3 and the vertical well 2 to jointly extract brine, so that the polyhalogen layer 6 is communicated with the vertical well 2, the horizontal well 3 is utilized to form a dominant water guiding gallery, collected brine is input into the brine extracting well 1 in a similar pipeline flow mode, the brine extracting capacity of the brine extracting well 1 is improved, the underground brine extracting rate of an engineering layout-free area is improved, and the effects of reducing capital construction investment and production maintenance cost and saving and utilizing mineral resources are achieved.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. A salt lake underground brine extracting system is characterized by comprising:
a brine production well capable of collecting brine;
the vertical wells extend vertically downwards from the ground, and the number of the vertical wells is at least one group;
the horizontal well comprises a horizontal section, the horizontal section is located on a brine layer at the lower part of the underground of a salt lake, the vertical well is communicated with the horizontal section, and the horizontal section is also communicated with the brine extraction well.
2. The underground salt lake brine mining system according to claim 1, wherein: the vertical well is parallel to the brine extraction well, and the horizontal section is perpendicular to the vertical well.
3. The underground salt lake brine mining system according to claim 1, wherein: the number of the vertical wells is multiple, and the multiple groups of the vertical wells are sequentially arranged along the direction of the axis of the horizontal section and towards the direction of gradually keeping away from the brine production well.
4. The underground salt lake brine mining system according to claim 1, wherein: the vertical well extends vertically downward below the floor of the lower brine layer below the salt lake subsurface.
5. The salt lake underground bittern collecting system of claim 1, wherein: the horizontal well further comprises an inclined section, the inclined section extends to a brine layer below the salt lake from the ground along the direction gradually close to the brine extraction well in an inclined mode, the inclined section is communicated with the horizontal section, and the inclined section is arranged at one end or two ends of the horizontal section.
6. The method for constructing the underground brine-mining system of the salt lake according to any one of claims 1 to 5, which comprises the following steps:
step one, constructing the vertical well;
and step two, constructing the horizontal well, and communicating the horizontal well with the vertical well and the brine extraction well.
7. The construction method of the underground salt lake brine mining system according to claim 6, wherein: the vertical well construction adopts a drilling mode of firstly drilling an exploration hole and then reaming.
8. The construction method of the underground salt lake brine mining system according to claim 6, wherein: and after the horizontal well is constructed, flushing and washing the well wall of the horizontal well by using the brine with pressure.
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| CN202210919796.5A CN115370344A (en) | 2022-08-01 | 2022-08-01 | Salt lake underground brine collecting system and construction method thereof |
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| CN202210919796.5A CN115370344A (en) | 2022-08-01 | 2022-08-01 | Salt lake underground brine collecting system and construction method thereof |
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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