CN106703752B - A kind of system enclosure method for oil shale underground in situ exploitation - Google Patents
A kind of system enclosure method for oil shale underground in situ exploitation Download PDFInfo
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- CN106703752B CN106703752B CN201611097759.1A CN201611097759A CN106703752B CN 106703752 B CN106703752 B CN 106703752B CN 201611097759 A CN201611097759 A CN 201611097759A CN 106703752 B CN106703752 B CN 106703752B
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- 239000004058 oil shale Substances 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 32
- 239000002002 slurry Substances 0.000 claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 claims abstract description 27
- 238000005065 mining Methods 0.000 claims abstract description 19
- 125000006850 spacer group Chemical group 0.000 claims abstract description 16
- 230000003204 osmotic effect Effects 0.000 claims abstract description 5
- 230000035699 permeability Effects 0.000 claims abstract description 3
- 238000007569 slipcasting Methods 0.000 claims description 36
- 238000010276 construction Methods 0.000 claims description 15
- 210000004911 serous fluid Anatomy 0.000 claims description 7
- 238000013517 stratification Methods 0.000 claims description 7
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000011440 grout Substances 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 2
- 229920002472 Starch Polymers 0.000 claims 1
- 235000019698 starch Nutrition 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 22
- 238000010438 heat treatment Methods 0.000 abstract description 7
- 239000006227 byproduct Substances 0.000 abstract description 4
- 230000000903 blocking effect Effects 0.000 abstract description 2
- 239000003245 coal Substances 0.000 description 9
- 230000008014 freezing Effects 0.000 description 7
- 238000007710 freezing Methods 0.000 description 7
- 239000010883 coal ash Substances 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- 239000011435 rock Substances 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000004744 fabric Substances 0.000 description 4
- 238000002309 gasification Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 108091006146 Channels Proteins 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 239000011414 polymer cement Substances 0.000 description 2
- 230000011218 segmentation Effects 0.000 description 2
- 102000010637 Aquaporins Human genes 0.000 description 1
- 108010063290 Aquaporins Proteins 0.000 description 1
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000003079 shale oil Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
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
- E21B36/00—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
- E21B36/003—Insulating arrangements
-
- 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
-
- 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/241—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection combined with solution mining of non-hydrocarbon minerals, e.g. solvent pyrolysis of oil shale
-
- 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
- E21B43/295—Gasification of minerals, e.g. for producing mixtures of combustible gases
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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)
- Railway Tracks (AREA)
Abstract
The invention discloses a kind of system enclosure method for oil shale underground in situ exploitation, closed system according to the present invention is made of the heat-insulated confining bed of top plate, floor spacer confining bed and horizon mining region closing curtain；The present invention covers oil shale in-situ production zone the following steps are included: one, the setting floor spacer confining bed at oil shale layer bottom plate, is connected to become entirety with horizon mining region closing curtain；Two, the heat-insulated confining bed of top plate is set at oil shale top plate, covers oil shale in-situ production zone, the method that the setting heat-insulated confining bed of top plate uses fracture grouting makes in each injected hole slurries mutually go here and there diameter.Three, closing curtain in horizon mining region is continuous and closed, using the method for osmotic grouting, passes through exploitation oil shale layer bottom plate, reaches the basal bed of bad hydraulic permeability；The present invention provides a closed heating region for oil shale underground in situ exploitation, for blocking the entrance of production zone longitudinal direction underground water, heat loss and the entrance of horizontal direction underground water and oil gas and byproduct outflow.
Description
Technical field
The present invention relates to a kind of ground in-situ system enclosure methods, in particular to a kind of to exploit for oil shale underground in situ
System enclosure method.
Background technique
Oil shale in-situ production technique is a kind of novel oil shale mining method after oil shale retorting, it passes through brill
The modes such as hole and hydraulic fracturing, form heating channel in subterranean oil shale rock stratum, and heat source enters behind heating channel to oil shale
Heating destructive distillation is carried out, the air-fuel mixture product of generation, which is exported through recovery well to earth's surface, carries out separating treatment.The oil shale that compares is dry
Technology is evaporated, oil shale in-situ production technique is few with ground installation, and occupied area is small, pollutes in production process small equal significant excellent
Point.
It mainly includes oil shale heating channel and oil shale layer crack that oil shale in-situ exploitation, which needs to form one in underground,
Closed exploitation space.Such a closed exploitation space is conducive to the range for controlling oil shale in-situ exploitation, avoids original
The adverse effects such as oil gas leakage are generated to external stratum in the recovery process of position.In the exploitation space of such a high temperature, especially
It is noted that the influence that underground water and the exploitation of temperature diffusion couple generate.On the one hand, if there is water in exploitation space or without exploitation
The characteristics of heat insulation work in space, specific heat big due to water, a big chunk heat will be only absorbed by the water, and be exploited and will be unable to reach in space
Ideal temperature influences oil shale recovery efficiency.On the other hand, if having water in exploitation space, even if producing oil gas, oil gas
A large amount of vapor can be carried and return to earth's surface, while oil supply gas-water separation work belt carrys out difficulty, be greatly reduced returning for oil gas
It produces effects rate.If exploitation space is connected with underground aquaporin, the pollutant generated in recovery process can enter underground reservoir,
Polluted underground water.Therefore, providing enclosure space for the production zone of oil shale is particularly important.
The ground in-situ production practice (ICP) of Shell Co. Ltd proposes a kind of underground freezing wall technology, with heated well and
Producing well certain distance bores more mouthfuls of spacing centainly and is interconnected to form the freezing well of closed system, and certain temperature is injected into well
Freezing liquid recycled in system, so that underground water around well and surrounding rocks is formed freezing wall.But underground freezes answering for wall
The disadvantages of in the process, there are long construction periods, and energy consumption is high, generate pollution to underground water.
Patent CN102278116B provides a kind of cold districts production underground freezing wall device and production freezing wall
Method.This method will be sent using low-temperature glycol aqueous solution as circulatory mediator from winter outdoor temperature cold source obtained
Enter in the hole beaten in advance, freeze geologic body, and then forms freezing wall.This method construction can only in winter and winter temperature is cold
Area carries out, and limitation is larger, without the condition being widely popularized.
Summary of the invention
Exist the purpose of the present invention is to solve the method that the existing production zone for oil shale provides enclosure space and applies
The work period is long, energy consumption is high, the problem of polluting environment, being subject to seasonal restrictions, and the one kind provided is suitable for different buried depth difference thickness
Oil shale underground in situ exploitation system enclosure method.
Closed system according to the present invention is by the heat-insulated confining bed of top plate, floor spacer confining bed and horizon mining region
Close curtain composition.
The present invention the following steps are included:
One, floor spacer confining bed is set at oil shale layer bottom plate, covers oil shale in-situ production zone, is opened with level
Exploiting field domain closing curtain is connected to become entirety；
It is to bore a series of fracture grouting of quincuncial arrangements on ground for the fracture grouting method of floor spacer confining bed
Hole, the grouting serous fluid in adjacent fracture grouting hole mutually go here and there diameter, and hole depth reaches oil shale layer bottom plate.
Injected hole passes through oil shale layer bottom plate, using the grouting mode of protrusive, carries out slip casting, slurries in oil shale bottom plate
It is greater than oil shale in-situ perpendicular under the action of pulling stress in stratification direction in pressure, oil shale layer of riving, the splitting route of slurries
In criss-cross veiny network, slurries mutually go here and there diameter in each injected hole, form floor spacer confining bed.
Two, the heat-insulated confining bed of top plate is set at oil shale top plate, covers oil shale in-situ production zone, top plate is set
The method that heat-insulated confining bed uses fracture grouting makes in each injected hole slurries mutually go here and there diameter.
It is to bore a series of fracture grouting of quincuncial arrangements on ground for the fracture grouting method of the heat-insulated confining bed of top plate
Hole, the grouting serous fluid in adjacent fracture grouting hole mutually go here and there diameter, and hole depth reaches oil shale layer top plate.
Injected hole passes through oil shale layer top plate, using the grouting mode of protrusive, carries out slip casting, slurries in oil shale top plate
It is greater than oil shale in-situ perpendicular under the action of pulling stress in stratification direction in pressure, oil shale layer of riving, the splitting route of slurries
In criss-cross veiny network, slurries mutually go here and there diameter in each injected hole, form the heat-insulated confining bed of top plate；
It is poured into fracture grouting hole and closes mud i.e. fracture grouting slurries, insertion one-way valve tube to oil shale layer top plate,
Grouting serous fluid to be cleaved is set in one-way valve tube, is inserted into slip casting core pipe into one-way valve tube, carries out slip casting；Work as slurry pressure
When greater than oil shale in-situ vertical stratification direction tensile stress, slurries are rived in oil shale layer and entrance crack, and it is heat-insulated to form top plate
Confining bed.
Three, closing curtain in horizon mining region is continuous and closed, using the method for osmotic grouting, passes through and exploits oily page
Rock stratum bottom plate reaches the basal bed of bad hydraulic permeability.
It is to bore a series of single slip castings on ground for the osmotic grouting method of horizon mining region closing curtain construction
Hole, slip casting hole depth reach at oil shale layer bottom plate, and slip casting pitch of holes should meet the grout mixing overlapping of adjacent holes, finally
Continuous and closed horizon mining region closing curtain can be formed.When carrying out slip casting to single hole, Ying Caiyong is segmented from bottom to top
The mode of slip casting, using only tholepin plug, carries out segmenting slip casting since oil shale bottom plate.
The course of work and principle of the invention are as follows:
The present invention is to provide a closed heating zone around oil shale in-situ production zone i.e. heat injection well and recovery well
Domain.
Arrange fracture grouting hole and curtain-grouting hole, fracture grouting hole is in quincunx distribution, and meets the slip casting of adjacent holes
Slurries mutually go here and there diameter, and hole depth reaches oil shale layer bottom plate.The rounded single distribution in curtain-grouting hole, adjacent single hole spacing 3m, hole
The deep 5m below oil shale layer bottom plate.
It is poured into fracture grouting hole and closes mud i.e. fracture grouting slurries, insertion one-way valve tube to oil shale layer bottom plate,
Grouting serous fluid to be cleaved is set in one-way valve tube, is inserted into slip casting core pipe into one-way valve tube, carries out slip casting.Work as slurry pressure
When greater than oil shale in-situ vertical stratification direction tensile stress, slurries are rived in oil shale layer and entrance crack, form floor spacer
Confining bed.Same method can form the heat-insulated confining bed of top plate.
After completing the heat-insulated confining bed of top plate and bottom plate, the construction of horizon mining region closing curtain is carried out, single hole is applied
Working hour, the tripping in grouting pipe in curtain-grouting hole, using only tholepin plug segmenting slip casting from bottom to top, by curtain-grouting slurries from
Grouting pipe injects 5-1 sections, after the completion of 5-1 sections of injections, starts 5-2 sections of slip casting, until 5-n sections.After the completion of single hole construction,
Carrying out other curtain-grouting holes again, (construction ultimately forms horizon mining region closing curtain.
After the completion of above step, that is, the heat-insulated closed area of oil shale in-situ exploitation is established, which can carry out oily page
The follow-up work of rock in-situ retorting.
Beneficial effects of the present invention: the present invention provides a closed heating region for oil shale underground in situ exploitation,
For blocking the entrance of production zone longitudinal direction underground water, heat loss and the entrance of horizontal direction underground water and oil gas and by-product stream
Out.
Detailed description of the invention
Fig. 1 is the system enclosure method schematic diagram of the embodiment of the present invention.
Fig. 2 is the plane well location layout drawing of the embodiment of the present invention.
Fig. 3 is the heat-insulated confining bed construction technology figure of top plate and bottom plate of the embodiment of the present invention.
Fig. 4 is that curtain construction process figure is closed in the horizon mining region of the embodiment of the present invention.
Specific embodiment
It please refers to shown in Fig. 1, Fig. 2, Fig. 3 and Fig. 4, is the first embodiment of the present invention, the obturator that the present embodiment is related to
System is made of the heat-insulated confining bed of top plate, floor spacer confining bed and horizon mining region closing curtain.
Need to block underground water entrance and heat loss on longitudinal direction；Need to block underground water entrance and oil gas in horizontal direction
And byproduct reserves.
It is shown according to geologic information, oil shale layer buried depth is 64~72m, and stratum belongs to weak water penetration stratum more.Draw a circle to approve oily page
Rock production zone is 30m × 30m square area.
According to the weak water penetration property on stratum, the construction of the heat-insulated confining bed of top plate and floor spacer confining bed is first carried out.It adopts
It is constructed with fracture grouting method, slip casting bore dia 80mm, hole depth 75m pass through oil shale layer.Quincunx progress is pressed in production zone
Cloth hole, distance between borehole 2.5m.Using protrusive grouting method.Grouting with plunger are as follows: drilling-slip casting-cleaning bottom of hole-drilling-slip casting.
At drilling to 61m, tripping in stop grouting plug carries out perforation slip casting, 2.5~3MPa of grouting pressure, and material is modified rubber cement, can also
Think nano modification superhigh tenacity cement-base composite material.After the completion of top plate slip casting, cleaning bottom of hole drilling is carried out, is crept into 75m, under
Enter stop grouting plug, perforation slip casting is carried out to bottom plate.
After the completion of the heat-insulated confining bed of top plate and floor spacer confining bed fracture grouting, level is formed using permeation grouting method and is opened
Close curtain, slip casting bore dia 80mm, hole depth 80m, until oil shale layer bottom plate in exploiting field domain.Injected hole is carried out along production zone periphery
Cloth hole, distance between borehole 1m.When single hole mortar depositing construction, using retrusive segmenting slip casting method from bottom to top, segmentation distance is 8m,
1~1.5MPa of grouting pressure, injecting paste material are to coagulate type polymer cement waterproof slurry fastly.
After the completion of closed system construction, water yield is from 19m in production zone3/ d drops to 1m3Within/d, oil shale in-situ
Production practice successfully carries out and output shale oil, it was demonstrated that this method can provide heat-insulated closed anti-for oil shale in-situ production practice
Region is answered, reduces thermal loss, underground water enters and the outflow of oil gas and byproduct.
It please refers to shown in Fig. 1, Fig. 2, Fig. 3 and Fig. 4, is the second embodiment of the present invention, the obturator that the present embodiment is related to
System is made of the heat-insulated confining bed of top plate, floor spacer confining bed and horizon mining region closing curtain.
Compared with the Coal Gasification of ground, underground gasification is not needed coal mining to ground, but coal seam is carried out in underground
Gasification, would not also lead to the problem of on the ground gangue or coal ash with accounting for firming, dust and fine particulates pollution atmosphere, phase
Ying Di, hazardous trace elements will increase the risk of underground water pollution in underground in coal ash.For reduce coal ash and with it is harmful in coal ash
Pollution of the element to groundwater environment, therefore need to a resistant-walled production zone be provided for underground coal gasification(UCG) in advance.
It is shown according to geologic information, somewhere coal seam buried depth is 41.2~47.0m, and stratum underground water is on the high side, draws a circle to approve mining area
Domain is 50m × 50m.
According to the weak water penetration property on stratum, the construction of the heat-insulated confining bed of top plate and floor spacer confining bed is first carried out.It adopts
It is constructed with fracture grouting method, slip casting bore dia 80mm, hole depth 50m pass through coal seam.Quincunx carry out cloth is pressed in production zone
Hole, distance between borehole 2.5m.Using protrusive grouting method.Grouting with plunger are as follows: drilling-slip casting-cleaning bottom of hole-drilling-slip casting.It bores
It proceeds at 39m, tripping in stop grouting plug, carries out perforation slip casting, 2.5~3MPa of grouting pressure, material is modified rubber cement, can also be with
For nano modification superhigh tenacity cement-base composite material.After the completion of top plate slip casting, cleaning bottom of hole drilling is carried out, is crept into 50m, tripping in
Stop grouting plug carries out perforation slip casting to bottom plate.
After the completion of the heat-insulated confining bed of top plate and floor spacer confining bed fracture grouting, level is formed using permeation grouting method and is opened
Close curtain, slip casting bore dia 80mm, hole depth 54m, until seat earth in exploiting field domain.Injected hole carries out cloth along production zone periphery
Hole, distance between borehole 1m.When single hole mortar depositing construction, using retrusive segmenting slip casting method from bottom to top, segmentation distance is 8m, note
1~1.5MPa of pressure is starched, injecting paste material is to coagulate type polymer cement waterproof slurry fastly.
After the completion of closed system construction, water yield is from 30m in production zone3/ d drops to 1m3Within/d, coal underground gas
Chemical industry skill successfully carries out and output coal bed gas, it was demonstrated that this method can provide heat-insulated closed reaction zone for coal underground gasifying technology
Domain reduces the pollution of coal ash and harmful element to groundwater environment.
Claims (1)
1. a kind of system enclosure method for oil shale underground in situ exploitation, closed system is by the heat-insulated confining bed of top plate, bottom
The heat-insulated confining bed of plate and horizon mining region closing curtain composition；It is characterized by comprising following steps:
One, floor spacer confining bed is set at oil shale layer (1) bottom plate, covers oil shale in-situ production zone, is opened with level
Exploiting field domain closing curtain is connected to become entirety；
It is to bore a series of the first fracture grouting of quincuncial arrangements on ground for the fracture grouting method of floor spacer confining bed
Hole (61), the grouting serous fluid in adjacent first fracture grouting hole (61) mutually go here and there diameter, and hole depth reaches oil shale layer (1) bottom plate；
First fracture grouting hole (61) passes through oil shale layer (1) bottom plate, using the grouting mode of protrusive, in oil shale layer (1)
Bottom plate carries out slip casting, and slurries are greater than oil shale in-situ perpendicular under the action of pulling stress in stratification direction in pressure, oil shale of riving
Layer (1), the splitting routes of slurries are in criss-cross veiny network, and slurries mutually go here and there diameter in each injected hole, formation floor spacer
Confining bed；
Two, the heat-insulated confining bed of top plate is set at oil shale layer (1) top plate, covers oil shale in-situ production zone, setting top
The method that the heat-insulated confining bed of plate uses fracture grouting makes in each injected hole slurries mutually go here and there diameter；
It is to bore a series of the second fracture grouting of quincuncial arrangements on ground for the fracture grouting method of the heat-insulated confining bed of top plate
Hole (62), the grouting serous fluid in adjacent second fracture grouting hole (62) mutually go here and there diameter, and hole depth reaches oil shale layer (1) top plate；
Second fracture grouting hole (62) passes through oil shale layer (1) top plate, using the grouting mode of protrusive, in oil shale layer (1)
Top plate carries out slip casting, and slurries are greater than oil shale in-situ perpendicular under the action of pulling stress in stratification direction in pressure, oil shale of riving
Layer (1), the splitting routes of slurries are in criss-cross veiny network, and slurries mutually go here and there diameter in each injected hole, and formation top plate is heat-insulated
Confining bed；
Closing mud i.e. fracture grouting slurries (13), insertion one-way valve tube (11) to oil are poured into the second fracture grouting hole (62)
Rammell (1) top plate, grouting serous fluid (13) to be cleaved are set in one-way valve tube (11), are inserted into slip casting core pipe (12) to unidirectionally
In valve pipe, slip casting is carried out；When slurry pressure is greater than oil shale in-situ vertical stratification direction tensile stress, slurries are rived oil shale layer
(1) and enter in crack, formed the heat-insulated confining bed of top plate (7)；
Three, closing curtain in horizon mining region is continuous and closed, using the method for osmotic grouting, passes through exploitation oil shale layer
(1) bottom plate reaches the basal bed of bad hydraulic permeability；
It is to bore a series of single third splitting notes on ground for the osmotic grouting method of horizon mining region closing curtain construction
It starches hole (63), third fracture grouting hole (63) depth reaches at oil shale layer (1) bottom plate, and third fracture grouting hole (63) spacing is answered
The grout mixing overlapping for meeting adjacent holes may finally form continuous and closed horizon mining region closing curtain；It is right
When single hole carries out slip casting, the mode of Ying Caiyong segmenting slip casting from bottom to top utilizes only tholepin since oil shale layer (1) bottom plate
It fills in (16), carries out segmenting slip casting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611097759.1A CN106703752B (en) | 2016-12-03 | 2016-12-03 | A kind of system enclosure method for oil shale underground in situ exploitation |
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| CN201611097759.1A CN106703752B (en) | 2016-12-03 | 2016-12-03 | A kind of system enclosure method for oil shale underground in situ exploitation |
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| CN106703752A CN106703752A (en) | 2017-05-24 |
| CN106703752B true CN106703752B (en) | 2019-04-19 |
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| CN107178355B (en) * | 2017-07-14 | 2023-03-14 | 新疆国利衡清洁能源科技有限公司 | Construction method of underground coal gasification system |
| CN107558950A (en) * | 2017-09-13 | 2018-01-09 | 吉林大学 | Orientation blocking method for the closing of oil shale underground in situ production zone |
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