CN104847327B - A kind of dull nugget second working method - Google Patents
A kind of dull nugget second working method Download PDFInfo
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- CN104847327B CN104847327B CN201510132126.9A CN201510132126A CN104847327B CN 104847327 B CN104847327 B CN 104847327B CN 201510132126 A CN201510132126 A CN 201510132126A CN 104847327 B CN104847327 B CN 104847327B
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- water
- dull
- well
- nugget
- central tube
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/283—Dissolving minerals other than hydrocarbons, e.g. by an alkaline or acid leaching agent in association with a fracturing process
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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. optimizing the spacing of wells
Abstract
The invention discloses a kind of dull nugget second working method, comprise the following steps：The new well of Drilling, individual well build groove, hydraulic fracturing, expand groove, installation oil-immersed pump, second working.Method provided by the invention can directly draw a large amount of dull bittern in useless molten chamber, and the later stage by selecting preferably old well in Subsidence Area, implements after-teeming fresh water, the dull nugget in solution subsidence area, improve the rate of extraction of mineral resources.Can also effectively drainage or reduce Subsidence Area water-bearing layer water level, fundamentally administer farmland emit halogen, reduce the loss of agricultural industry.
Description
Technical field
The present invention relates to coal mining method, particularly relates to a kind of dull nugget second working method.
Background technology
Chinese halogen sedimentary deposit is exploited in the 70-80 ages using original Splitting Method, pressing crack construction crack between well and well
The direction of generation can not manual control, thus pressure burst communicatin can only leave it to chance between two wells.General shaft bottom is difficult to form level
Crack, presses between planned well obstructed, and constructor often takes pressure break by force, and the result of this construction often produces vertical fracture,
Molten chamber top plate is crushed, and the upper caldding layer of ore body often a large amount of water-fillings, is become containing brine layer.
Again due to the molten chamber in underground be chronically at it is super-strength it is molten adopt, molten chamber across become exceeded the early formula stope limit across change
More than ten times, some has even reached more than 20 times.The compression of molten chamber roof strata supports mainly by the bittern in molten chamber.Work as bittern
Buoyancy is less than upper caldding layer pressure, then molten chamber occurs and crush, and sedimentation severe patient top plate occurs and collapsed, the bittern quilt in molten chamber
It is squeezed into cap rock, and is emerged ground along crack, forms the disastrous farmland of large area, fish pond emits halogen.
With the exploitation of the conventional water-soluble pressure break of Chinese well mine salt, the Hunan Hunan Li salt mines of last century the seventies, this century
There is above-mentioned disaster in succession in first Jiujiang, three big salt mine of Hubei Yingcheng City.One exploiting field of Xiangli Salt Mine, Hunan Prov. in August nineteen ninety
There occurs molten chamber top plate large area depression in dog-leg gulf to collapse, largely emitting halogen at the number of top subsidence simultaneous farmland (emits halogen
No kernels or seeds are gathered, as in a year of scarcity and can not cultivate in area farmland), emit halogen amount 250m wherein emitting halogen at one and selecting maximum3/ h, bittern concentration are Be'15 °.
Because Underground Dissolved Cavity loses air-proof condition, water act can not be implemented and adopt halogen.Therefore, the molten chamber have to be forced to stop exploitation, and one adopts
Area is also at accordingly reducing 1/3rd suddenly by the state of giving up, the halogen ability of adopting in mine, and very big influence is brought to salt manufacturing, and
And bittern pollutes substantial amounts of rice field.When top plate collapse accident occurs, the recovery ratio only up to 23% of the blocked-out ore reserve of the stope is molten
Top of chamber also has substantial amounts of dull nugget, can not carry out the radical cure and back production in mining area, also there is substantial amounts of dull high concentration in molten chamber
Bittern.After 1 year, emit that halogen is still serious, and dry season minimum emits halogen in the farmland of Subsidence Area and select that to emit halogen amount be 3m3/ h, concentration Be'
18°；Rainy season emits halogen amount reckling 12m3/ h, Be'10 ° of concentration, stope can not still recover solution mining.
Therefore, need one kind badly and can thoroughly solve farmland and emit halogen, alleviate enterprise's salt manufacturing predicament and can exploit dull halogen again
The method of water and nugget, the recovery ratio of mineral resources is improved, protect national mineral resources.
The content of the invention
In view of this, it is an object of the invention to propose a kind of dull nugget second working method.
Based on above-mentioned purpose dull nugget second working method provided by the invention, can directly draw big in useless molten chamber
Measure dull bittern, and by after-teeming fresh water, the dull nugget in solution subsidence area, improve the rate of extraction of mineral resources, can also
Effective drainage or the water level for reducing Subsidence Area water-bearing layer, fundamentally administer farmland and emit halogen, reduce the loss of agricultural industry.
Dull nugget second working method, comprises the following steps：
(1) the new well of Drilling：The new well of Drilling on the ore body of the natural joint fissure underlap of selected old well, in new well
Well cementing pipe, sleeve pipe and central tube are installed, the well cementation infratubal port is located at basic unit, and described sleeve pipe lower port is located at bed top,
The center infratubal port is located at below seam floor or seam floor.Space sets cement plug in the well of the new bottom,
The lower port of the central tube is located above cement plug.
(2) individual well builds groove：Fresh water is injected from central tube, fresh water dissolution ore bed forms salt bath, the bittern edge set after dissolving
Manage and returned out with the annular space of central tube.
(3) hydraulic fracturing：Fresh water is injected from central tube, fresh water moves along the crack between Xin Jing and old well to old well
It is dynamic, expand the crack between Lao Jing and new well, until Lao Jing connects with new well, the step need to control water injection rate and pressure.
(4) groove is expanded：After Xin Jing connects with old well, hydraulic pressure is increased, by the molten molten width of height in crack, forms it into entry.
(5) oil-immersed pump is installed：The central tube in new well is proposed, at center, bottom of the tube installs oil-immersed pump, places into central tube,
Pump out bittern.
(6) second working：When dull bittern has been drawn, the old well without deformation is selected to carry out after-teeming fresh water in Subsidence Area,
The dull nugget of second working is carried out, brings back to life the molten chamber that gives up again.
The angle of inclination of the new well is less than or equal to 2 degree, and the new shaft bottom end is less than molten 1~2 meter of chamber minimum point of giving up.
The length of the cement plug is 1~1.5 meter.
The bore of the well cementing pipe, sleeve pipe and central tube is gradually reduced.
A diameter of 3~5 meters of the salt bath formed in the step (2).
In the step (3) before central tube injects fresh water, central tube is proposed, bottom of the tube installs screen casing, institute at center
The bottom lock of screen casing is stated, tube wall has sieve aperture；After installing, central tube is put into, fresh water is injected from central tube, from screen casing
Sieve aperture sprays.
The scope of fracture pressure is 5.0MPa~7.0MPa in the step (3).
After fracture pressure peak occurs in the step (3), water injection rate is controlled in 4~6m3/ h, water filling overall control exist
350~500m3.If fracture pressure high level section unobvious, total water injection rate control is in 1000m3Within.
The water injection rate for expanding the groove phase in the step (4) is controlled in 25~35m3/h。
Second working is to pump out bittern caused by the dull nugget of dissolving using pump in the step (6).
When the useless molten chamber of Subsidence Area is linked up with bed top water-bearing layer：
If the Groundwater infiltration in water-bearing layer gives up, the water of molten chamber is equal to the dull nugget institute water requirement of back production, second working
When, it is not necessary to artificial recharge；
Water if water-bearing layer is given up in molten chamber is less than back production institute water requirement, need to from the old well of Subsidence Area after-teeming fresh water it is molten
Solve dull nugget.
If the water that water-bearing layer is penetrated into the molten chamber that gives up needs to refill in light bittern more than the water needed for second working
Other normal well group enrichings, become qualified bittern.
, need to be in depression when the bittern in molten chamber has been drawn if crack water-filling when bed top is without water-bearing layer, only pressure break
After-teeming fresh water in the old well in area, meet the water needed for the dull nugget of second working.
From the above it can be seen that a large amount of dull bittern provided by the invention that can directly draw in useless molten chamber, after
Phase can select preferably old well in Subsidence Area, implement after-teeming fresh water, the dull nugget in solution subsidence area, improve mineral resources
The rate of extraction, recovery ratio can at least improve more than 50%, greatly extend the life-span in mine, can alleviate salt manufacturing halogen source deficiency
The problem of, the quantity of drilling new well can also be reduced, greatly reduces cost.And because the bittern of high concentration is exploited,
Energy consumption is reduced for vacuum salt production.Can also effectively drainage or reduce Subsidence Area water-bearing layer water level, fundamentally administer agriculture
Field emits halogen, and farmland can return to normal production, and reduce the loss of agricultural industry.
Brief description of the drawings
Fig. 1 is the new well position view of the embodiment of the present invention；
Fig. 2 is the new well casing programme of the embodiment of the present invention and its relation schematic diagram with the molten chamber that gives up.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with specific embodiment, and reference
Accompanying drawing, the present invention is described in more detail.
Fig. 1 is the new well position view of the embodiment of the present invention, and Fig. 2 is for the new well casing programme of the embodiment of the present invention and its with giving up
The relation schematic diagram of molten chamber.
As shown in figure 1, it is new well position view in the embodiment of the present invention.Gou Tui Wan stopes by 12 mouthfuls of well constructions,
Underground Dissolved Cavity horizontal projection is in M-shaped, ore body upper caldding layer thickness 237.6-387.42 rice, and beginning soluble layer buried depth 272.5~
341.8 rice.Exploited using original Splitting Method, its main kill-job has 118,119,219,324,218,325 etc. six mouthfuls of wells, later stage and land
Continue 221,226,112,234,235,236 etc. six mouthfuls of wells of Drilling.Because large area is exploited for a long time, occur June nineteen ninety
Molten chamber top subsidence collapses, and ground many places emit halogen, causes the disaster in pollution in wide area farmland.
The mine structure that molten chamber top plate collapses is from the bottom to top useless molten chamber, bed top and Subsidence Area.Molten chamber top plate collapses
Afterwards, original molten chamber loses sealing and forms useless molten chamber, and molten intracavitary of giving up has substantial amounts of dull nugget bittern and enters ore bed top
Plate, emerged ground along the crack of Subsidence Area, polluted agricultural land.
Emit halogen farmland pollution for radical cure and carry out the second working of dull nugget, dull nugget provided by the invention it is secondary
Stoping method, comprise the following steps：
(1) the new well of Drilling：As shown in figure 1, ore bed on the underlap of the natural joint fissure of selected old well 118
Tilt the new well 1 of Drilling on the ore pillar of lower section.As shown in Fig. 2 the new well 1 is located on the ore bed for the molten flank of chamber 10 that gives up, and newly
The bottom of well 1 is less than molten 1~2 meter of 10 minimum point of chamber of giving up, and so as to form a drop, the bittern in old well 118 is smoothly flowed into new
In well.
Wherein, useBore is drilled into basic unit 5, usesBore is drilled into bed top 6,Bore is drilled into seam floor 2m end holes below 7.Installation well cementing pipe 2, sleeve pipe 3 and central tube 4, described in new well 1
Well cementing pipe, sleeve pipe and central tube bore are gradually reduced, and inside is hollow-core construction.The lower port of well cementing pipe 2 is located at basic unit 5, sleeve pipe 3
Lower port is located at bed top 6, and the lower port of central tube 4 is located at seam floor below 7.Space sets water in the well of the new bottom of well 1
The bod 8, the length of the cement plug 8 is 1~1.5 meter.The lower port of the central tube 4 is located at the top of cement plug 8, when fresh water passes through
When central tube 4 injects and impacted on cement plug 8, cement plug 8 rebounds the fresh water of bump, implement using horizontal-jet as
It is main.
(2) individual well builds groove：As shown in Fig. 2 fresh water is injected from central tube 4, fresh water dissolution ore bed forms 3~5 meters of salt baths
9, the bittern after dissolving returns out along the annular space between sleeve pipe 3 and central tube 4.The rupture pressure of rock stratum can not only be reduced by building groove
Power, shorten new well 1 and split brokenly distance with the molten chamber 10 that gives up, and the formation of molten chamber can be controlled, based on carrying out horizontal expansion, avoid
Caused hole collapse based on vertical expansion.
(3) hydraulic fracturing：Using the orientation new well 1 of hydrofracturing method pressure burst communicatin and old well 118.By fresh water from central tube 4
Injection, fresh water move along the crack between new well 1 and old well 118 to old well 118, expand splitting between new well 1 and old well 118
Seam, until being connected with the molten chamber 10 that gives up, and then connected with the old well 118 in the molten chamber 10 that gives up, pressure burst communicatin process need to control water injection rate
And pressure.
As an alternative embodiment of the invention, before fresh water is injected to central tube 4, central tube 4 is proposed, in central tube
Screen casing, the bottom lock of the screen casing are installed in 4 bottoms, and tube wall has sieve aperture.After installing, central tube 4 is put into, by fresh water therefrom
Heart pipe 4 injects, and is sprayed at a high speed from the sieve aperture of screen casing is horizontal, directly acts on seam floor 7, extrude natural joint fissure, be water
The spreading of plane fracture seam creates conditions.
As another embodiment of the present invention, the scope of fracture pressure is 5.0MPa~7.0MPa.
As another embodiment of the present invention, after fracture pressure peak occurs, water injection rate is controlled in 4~6m3/ h, water filling are total
Amount control is in 350~500m3；If fracture pressure high level section unobvious, total water injection rate control is in 1000m3Within.Ore bed ruptures
In the stage, water injection rate is bigger, upper and lower bigger, the unfavorable connection of beating in crack.Therefore, it is necessary to control water injection rate, be easy to new well 1 with it is old
The connection of well 118.
(4) groove is expanded：After new well 1 connects with old well 118, hydraulic pressure is increased, that is, water injection rate is increased, by the molten Gao Rong of horizontal fracture
Width, elongated entry is formed it into, the bittern being easy in useless molten chamber 10 is smooth to flow into new well 1.Expand the water injection rate control of groove phase
System is in 25~35m3/ h, the salt bath 9 that the formation of groove phase is built because of new well 1 reach 3~5 meters, and dissolving acreage is larger, only increases as far as possible
Water injection rate, just can guarantee that has stronger solution ration in crack.
(5) oil-immersed pump is installed：The central tube 4 in new well 1 is proposed, oil-immersed pump is installed in the bottom of central tube 4, places into center
Pipe 4.The dull bittern to give up in molten chamber 10 flows into the new bottom of well 1 through entry and pumped out by oil-immersed pump.
(6) second working：When dull bittern has been drawn, the old well after-teeming fresh water without deformation is selected in Subsidence Area, is carried out
The dull nugget of second working, the molten chamber that gives up is brought back to life again.
As one embodiment of the present of invention, second working is to be pumped out molten to adopt bittern caused by dull nugget with oil-immersed pump.
When the useless molten chamber under Subsidence Area and bed top water-bearing layer are linked up：
If the Groundwater infiltration in water-bearing layer gives up, the water of molten chamber is equal to the dull nugget institute water requirement of back production, second working
When, it is not necessary to artificial recharge.
Water if water-bearing layer is given up in molten chamber is less than back production institute water requirement, need to from the old well of Subsidence Area after-teeming fresh water it is molten
Solve dull nugget.
If the water that water-bearing layer is penetrated into the molten chamber that gives up needs to refill in light bittern more than the water needed for second working
Other normal well group enrichings, become qualified bittern.
, need to be in depression when the bittern in molten chamber has been drawn if crack water-filling when bed top is without water-bearing layer, only pressure break
After-teeming fresh water in the old well in area, meet the water needed for the dull nugget of second working.
As can be seen here, method provided by the invention can directly draw a large amount of dull bittern in useless molten chamber, and the later stage can
Preferably old well is selected in Subsidence Area, implements after-teeming fresh water, the dull nugget at the top of solution subsidence area, improves mineral resources
The rate of extraction, recovery ratio can at least improve more than 50%, greatly extend the life-span in mine, can alleviate salt manufacturing halogen source deficiency
The problem of, the quantity of drilling new well can also be reduced, greatly reduces cost.And because the bittern of high concentration is exploited,
Energy consumption is reduced for vacuum salt production.Can also effectively drainage or reduce Subsidence Area water-bearing layer water level, fundamentally administer agriculture
Field emits halogen, and farmland can return to normal production, and reduce the loss of agricultural industry.
Those of ordinary skills in the art should understand that：The specific embodiment of the present invention is the foregoing is only, and
The limitation present invention is not used in, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc.,
It should be included within protection scope of the present invention.
Claims (9)
- A kind of 1. dull nugget second working method, it is characterised in that comprise the following steps：(1) the new well of Drilling：The new well of Drilling on the ore body of the natural joint fissure underlap of selected old well, is installed in new well Well cementing pipe, sleeve pipe and central tube, the well cementation infratubal port are located at basic unit, and described sleeve pipe lower port is located at bed top, described Center infratubal port is located at below seam floor or seam floor；Space sets cement plug in the well of the new bottom, described The lower port of central tube is located above cement plug；(2) individual well builds groove：Fresh water is injected from central tube, fresh water dissolution ore bed forms salt bath, bittern after dissolving along sleeve pipe with The annular space of central tube returns out；(3) hydraulic fracturing：Fresh water is injected from central tube, fresh water moves along the crack between Xin Jing and old well to old well, expands Crack between great Lao Jing and new well, until Lao Jing connects with new well, the step need to control water injection rate and pressure；(4) groove is expanded：After Xin Jing connects with old well, hydraulic pressure is increased, by the molten molten width of height in crack, forms it into entry；(5) oil-immersed pump is installed：The central tube in new well is proposed, bottom of the tube installs oil-immersed pump at center, places into central tube, pumps out Bittern；(6) second working：When dull bittern has been drawn, select the old well without deformation to carry out after-teeming fresh water in Subsidence Area, carry out The dull nugget of second working, the molten chamber that gives up is brought back to life again；The new shaft bottom end is less than molten 1~2 meter of chamber minimum point of giving up；In the step (3) before central tube injects fresh water, central tube is proposed, bottom of the tube installs screen casing, the sieve at center The bottom lock of pipe, tube wall have sieve aperture；After installing, central tube is put into, fresh water is injected from central tube, from the sieve aperture of screen casing Spray.
- 2. dull nugget second working method according to claim 1, it is characterised in that the angle of inclination of the new well is small In equal to 2 degree.
- 3. dull nugget second working method according to claim 1, it is characterised in that the length of the cement plug is 1 ~1.5 meters.
- 4. dull nugget second working method according to claim 1, it is characterised in that the well cementing pipe, sleeve pipe and in The bore of heart pipe is gradually reduced.
- 5. dull nugget second working method according to claim 1, it is characterised in that formed in the step (2) A diameter of 3~5 meters of salt bath.
- 6. dull nugget second working method according to claim 1, it is characterised in that rupture pressure in the step (3) The scope of power is 5.0MPa~7.0MPa.
- 7. dull nugget second working method according to claim 1, it is characterised in that rupture pressure in the step (3) After power peak occurs, water injection rate is controlled in 4~6m3/ h, water filling overall control is in 350~500m3；If fracture pressure high level section Unobvious, total water injection rate control is in 1000m3Within.
- 8. dull nugget second working method according to claim 1, it is characterised in that expand the groove phase in the step (4) Water injection rate control in 25~35m3/h。
- 9. dull nugget second working method according to claim 1, it is characterised in that secondary returning in the step (6) Adopt is to pump out bittern caused by the dull nugget of dissolving using pump；When the useless molten chamber of Subsidence Area is linked up with bed top water-bearing layer：If the Groundwater infiltration in water-bearing layer gives up, the water of molten chamber is equal to the dull nugget institute water requirement of back production, during second working, Artificial recharge is not needed；Water if water-bearing layer is given up in molten chamber is less than back production institute water requirement, after-teeming fresh water dissolution need to be stayed from the old well of Subsidence Area Stagnant nugget；If the water penetrated into the molten chamber that gives up of water-bearing layer more than the water needed for second working, need to refill in light bittern it is other Normal well group enriching, becomes qualified bittern；, need to be in Subsidence Area when the bittern in molten chamber has been drawn if crack water-filling when bed top is without water-bearing layer, only pressure break After-teeming fresh water in old well, meet the water needed for the dull nugget of second working.
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| CN201510132126.9A CN104847327B (en) | 2015-03-24 | 2015-03-24 | A kind of dull nugget second working method |
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| CN201510132126.9A CN104847327B (en) | 2015-03-24 | 2015-03-24 | A kind of dull nugget second working method |
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| CN104847327B true CN104847327B (en) | 2018-01-12 |
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| CN105863599A (en) * | 2016-04-27 | 2016-08-17 | 重庆大学 | Old well utilization method adopting single-cavity old well as brine-extraction horizontally-butted well |
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|---|---|---|---|---|
| CN1558086A (en) * | 2004-02-09 | 2004-12-29 | 太原理工大学 | Group-well fracture pressure steeping control aqueous fusion exploitation method of glauberite bal |
| CN1818326A (en) * | 2006-02-23 | 2006-08-16 | 上海太平洋化工(集团)淮安元明粉有限公司 | Cracking exploitation for reussin mine |
| CN102108853A (en) * | 2011-01-14 | 2011-06-29 | 沙隆达集团公司 | Salt mine double-well solution mining method |
| CN102434141A (en) * | 2011-09-16 | 2012-05-02 | 化工部长沙设计研究院 | Method for mining sylvite in underground carnallite ore |
| CN103032059A (en) * | 2012-12-21 | 2013-04-10 | 陈建明 | Directional hydraulic fracturing connected mining method |
| CN103075140A (en) * | 2012-12-31 | 2013-05-01 | 陈建明 | Device and method for realizing corrosion communication of thin salt layer |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8678513B2 (en) * | 2008-08-01 | 2014-03-25 | Solvay Chemicals, Inc. | Traveling undercut solution mining systems and methods |
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2015
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1558086A (en) * | 2004-02-09 | 2004-12-29 | 太原理工大学 | Group-well fracture pressure steeping control aqueous fusion exploitation method of glauberite bal |
| CN1818326A (en) * | 2006-02-23 | 2006-08-16 | 上海太平洋化工(集团)淮安元明粉有限公司 | Cracking exploitation for reussin mine |
| CN102108853A (en) * | 2011-01-14 | 2011-06-29 | 沙隆达集团公司 | Salt mine double-well solution mining method |
| CN102434141A (en) * | 2011-09-16 | 2012-05-02 | 化工部长沙设计研究院 | Method for mining sylvite in underground carnallite ore |
| CN103032059A (en) * | 2012-12-21 | 2013-04-10 | 陈建明 | Directional hydraulic fracturing connected mining method |
| CN103075140A (en) * | 2012-12-31 | 2013-05-01 | 陈建明 | Device and method for realizing corrosion communication of thin salt layer |
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