CN107100608A - Coal underground gasification drill hole bottom protection structure and construction method - Google Patents
Coal underground gasification drill hole bottom protection structure and construction method Download PDFInfo
- Publication number
- CN107100608A CN107100608A CN201710461870.2A CN201710461870A CN107100608A CN 107100608 A CN107100608 A CN 107100608A CN 201710461870 A CN201710461870 A CN 201710461870A CN 107100608 A CN107100608 A CN 107100608A
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- Prior art keywords
- hole
- drill holes
- casing pipe
- foot guard
- coal gasification
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- 239000003245 coal Substances 0.000 title claims abstract description 56
- 238000002309 gasification Methods 0.000 title claims abstract description 34
- 238000010276 construction Methods 0.000 title claims abstract description 25
- 239000000463 material Substances 0.000 claims abstract description 37
- 239000003208 petroleum Substances 0.000 claims description 34
- 239000011435 rock Substances 0.000 claims description 13
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 241001074085 Scophthalmus aquosus Species 0.000 claims description 2
- 238000012360 testing method Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000005065 mining Methods 0.000 abstract description 3
- 230000001681 protective effect Effects 0.000 abstract description 2
- 238000005553 drilling Methods 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000007596 consolidation process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000019994 cava Nutrition 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 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
- 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
- E21B43/02—Subsoil filtering
- E21B43/10—Setting of casings, screens, liners or the like in wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Geochemistry & Mineralogy (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Remote Sensing (AREA)
- Earth Drilling (AREA)
- Foundations (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The invention provides a coal underground gasification drill hole bottom protection structure which is characterized in that the bottom of an oil casing is surrounded by well cementation materials, the well cementation materials are provided with holes communicated with the oil casing, protection pipes are arranged on the holes, and the holes are communicated with a coal seam. The drill hole can be pressed in a balanced manner and prevented from collapsing through the supporting structure before being used after being discharged, the stability of the bottom of the hole in a furnace building period of several months is guaranteed to a great extent, and the finished drill hole can be placed for a long time. The protective structure has the advantages of simple construction process, low cost and good reliability, and is suitable for underground discharge and mining of high-temperature gas. The invention also provides a construction method of the coal underground gasification drill hole bottom protection structure.
Description
Technical field
The present invention relates to underground coal gasification(UCG) production technique field, in particular to a kind of underground coal gasification drill holes
Foot guard structure and construction method.
Background technology
Coal underground gasification technology can carry out coal resources in-situ retorting, and be converted into fuel gas, its recovery process
In need not be manually entered coal-face, and mainly utilize the formation reaction of the forms such as heat effect, chemical reaction of gasifying agent and coal
Working face, effective industrial mixed gas is converted into by combustible component in coal, and mixed gas drains into earth's surface by geotechnical boring, should
Technology has the advantages such as resources conservation, clean environment firendly, safety in production.
Generally, after petroleum casing pipe is transferred in the geotechnical boring of coal seam top and well cementing of cement is completed, that is, venthole is completed
The naked state protected is not done essentially inside main construction working, coal seam, generally the usage cycles of a bite venthole
At least need more than 5 years, but at the scene in production process, the venthole completed using above-mentioned means is used 1 to two year normal
Afterwards, under firepower and stress collective effect, roof around bottom hole sleeve pipe and cementing concrete ring continuously emerges and caves in, conducting top
Plate water-bearing layer blocks outlet passageway, influence process stabilizing operation, causes drilling to scrap in advance.
Existing domestic patent CN 101749005B propose a kind of protection process of underground drilling hole, and the technology is mainly for gasification
The protection of foot of hole in stove building process, and before the drilling is started for producing gas, the protection need to be destroyed in bottom hole
Device, still protective action is not played during production outlet to foot of hole.
The content of the invention
In consideration of it, the present invention proposes a kind of underground coal gasification drill holes foot guard structure and construction method, for boring
The protection of hole life cycle management, it is intended to solve the above problems.
On the one hand, the present invention proposes a kind of underground coal gasification drill holes foot guard structure, it is characterised in that oil set
Bottom of the tube is surrounded by well cementing material, and the well cementing material is offered on the hole connected with the petroleum casing pipe, the hole equipped with anti-
Coal seam is led in pillar, the hole.
Further, above-mentioned underground coal gasification drill holes foot guard structure, it is characterised in that the hole and the oil
The angle of sleeve pipe is predetermined angular.
Further, above-mentioned underground coal gasification drill holes foot guard structure, it is characterised in that the predetermined angular size
For 30 degree to 75 degree.
Further, above-mentioned underground coal gasification drill holes foot guard structure, it is characterised in that have card on the protecting tube
Button, the buckle is used to the protecting tube being fixed on the petroleum casing pipe.
On the other hand, the invention also provides a kind of underground coal gasification drill holes foot guard construction method, it is special
Levy and be, including,
Step S1, in coal seam, adjoining rock and bottom plate basement rock certain limit, is bored using reducing reaming bit and hollowed out
Chamber；
Step S2, decentralization petroleum casing pipe to borehole bottom location, if the closure of petroleum casing pipe bottom and bottom end lateral opening hole
It is dry,
Step S3, is cemented the well, and whole jacket exterior cavity is filled by well cementing material；
Step S4, well cementing material is reached after predetermined strength, places plugging material by end hole plug；
Step S5, opens some inclined holes in cylindrical space middle and upper part with opening bit and transfers pillar, to fresh coal seam portion
Position, completes safeguard structure and passage is built.
Further, above-mentioned underground coal gasification drill holes foot guard construction method, it is characterised in that the well cementation
Material is suitable for the well cementing material under superhigh temperature, condition of high voltage.
Further, above-mentioned underground coal gasification drill holes foot guard construction method, it is characterised in that step S4,
The predetermined strength is compression strength and intensity is not less than 3.5MPa.
Further, above-mentioned underground coal gasification drill holes foot guard construction method, it is characterised in that complete step
S2, the petroleum casing pipe decentralization completes and pressure test is carried out after closure, and the pressure loss carries out step S3 after meeting the requirements.
Further, above-mentioned underground coal gasification drill holes foot guard construction method, it is characterised in that bore and dig described
The radius of cavity is 5-10 times of the petroleum casing pipe radius.
Further, above-mentioned underground coal gasification drill holes foot guard construction method, it is characterised in that the cavity
Top is apart from coal seam 3-5 meters, and 2-3 meters of horizon d is goed deep into the cavity bottom.
Beneficial effects of the present invention：
Due to foring connection gasification coal seam and the outlet passageway of drilling, so coal seam, top before, during and after gasification
Plate have support protect, retaining hole bottom structure it is basicly stable.
Drilling can evenly be pressed by supporting construction using preceding in outlet, prevented collapse hole, and high degree ensure that it
In the stability for building bottom hole in the stove cycle of some months, i.e., completed drilling can be placed for a long time.
Drilling, by superhigh temperature resistant, some outlet inclined holes of high pressure material protection, alleviates thermal effect during outlet use
Be not in sleeve pipe fusing phenomenon during the influence of reply bottom sleeve, outlet, extend the service life of sleeve pipe.
Foot of hole periphery is produced after burned out area, cylindrical entity supporting construction top consolidation roof, bottom consolidation
Bottom plate basement rock, provides support to be at least a range of space of foot of hole, prevents borehole circumference roof strata slump from making
Into blocking.
The safeguard structure work progress is simple, and cost is low, good reliability, it is adaptable to the underground mining of high-temperature gas.
Brief description of the drawings
By reading the detailed description of hereafter preferred embodiment, various other advantages and benefit is common for this area
Technical staff will be clear understanding.Accompanying drawing is only used for showing the purpose of preferred embodiment, and is not considered as to the present invention
Limitation.And in whole accompanying drawing, identical part is denoted by the same reference numerals.In the accompanying drawings：
Fig. 1 is venthole overall structure diagram of the present invention；
Fig. 2 is venthole foot guard structural representation of the present invention；
Wherein：1- petroleum casing pipes, 2- sides wall well cementing material, 3- petroleum casing pipes side opening, 4, inclined hole pillar, 5- inclined hole pillar cards
Button, 6- cylindrical cavities, 7- well cementing materials, 8- plugging materials, 9- petroleum casing pipes bottom side opening, 10- the 4th are table soil, 11- rocks
Layer (roof and floor), 12- water-bearing layers, 13- coal seams, 14- horizon ds.
Embodiment
The exemplary embodiment of the disclosure is more fully described below with reference to accompanying drawings.Although showing the disclosure in accompanying drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
Limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure
Complete conveys to those skilled in the art.It should be noted that in the case where not conflicting, embodiment in the present invention and
Feature in embodiment can be mutually combined.Describe the present invention in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
As shown in Figure 1, 2, a kind of underground coal gasification drill holes foot guard structure, mainly includes：Petroleum casing pipe 1, side wall
Well cementing material 2, petroleum casing pipe side opening some 3, inclined hole pillar some 4, inclined hole pillar buckle 5, cylindrical cavity 6, well cementing material
7th, plugging material 8, petroleum casing pipe bottom side opening some 9.
Petroleum casing pipe bottom is surrounded by well cementing material 7, and the well cementing material 7 offers what is connected with the petroleum casing pipe
Protecting tube is housed, coal seam is led in the hole on hole, the hole.
The angle of petroleum casing pipe side opening 3 and petroleum casing pipe 1 is predetermined angular, and predetermined angular size is 30 degree to 75 degree.Enter
It is preferably one step 55 degree to 65 degree, construction of being more convenient for.
There is buckle 5 on protecting tube 4, the buckle 5 is used to the protecting tube 5 being fixed on the petroleum casing pipe 1.
General construction needs subdrilling to dig geology open-hole：
It is table soil 10, rock stratum 11, water-bearing layer 12, Roof Rock Strata of Coal Seam 11, coal seam that geology vertical drilling passes through the 4th successively
13rd, seat earth rock stratum 11, pierces 142-3 meters of horizon d, forms geology open-hole.
Geology open-hole carries out the following steps after well logging and passed examination：
Step S1, in coal seam, adjoining rock and bottom plate basement rock certain limit, is bored using reducing reaming bit and hollowed out
Chamber：
Step S2, decentralization petroleum casing pipe to borehole bottom location, if the closure of petroleum casing pipe bottom and bottom end lateral opening hole
It is dry,
Step S3, is cemented the well, and whole jacket exterior cavity is filled by well cementing material；
Step S4, well cementing material is reached after predetermined strength, places plugging material by end hole plug；
Step S5, opens some inclined holes in cylindrical space middle and upper part with opening bit and transfers pillar, to fresh coal seam portion
Position, completes safeguard structure and passage is built.
It is of course also possible to transformed for the open-hole excavated, the process that above-mentioned brill digs open-hole is saved, but for
Open-hole depth is unsatisfactory for further ground auger the need for requiring and dug until piercing 142-3 meters of horizon d.
Step S1, using reducing reaming bit from roof strata 11 in the range of coal seam 3-5 meters (concrete numerical value is depended on
Balkstone mechanical property) start reaming, make cave manufacture cavity, hole passes through coal seam 13, seat earth rock stratum 11, into basement rock
142-3 meters of layer, forms cylindrical cavity 6, hole radius is 5-10 times of open-hole radius, and open-hole diameter and petroleum casing pipe diameter are near
It is equal, so hole radius is approximately equal to 5-10 times of petroleum casing pipe diameter.
Then step S2 is carried out, the sealed bottom petroleum casing pipe 1 containing 3-5 bottom hole 9 is transferred.Petroleum casing pipe is placed steady
After fixed, decentralization plugging material 8 blocks petroleum casing pipe bottom hole 9, pressurization checking sleeve pipe seal, after the pressure loss meets the requirements
Take out plugging material 8.Well cementing material 7 is pressed into the space between stratum and petroleum casing pipe 1 by bottom side opening 9.This programme is adopted
Cemented the well and (be applied to if other under superhigh temperature, condition of high voltage with G grades of above oil-well cements and corresponding material grain composition
Well cementing material can also be as an alternative).
Well cementing material is waited solidifying 12-24 hour, and its compression strength is when being not less than 3.50MPa, transfers plugging material 8 by oil
Casing shoe hole 9 is blocked, and is opened some side openings 3 in the middle and upper part certain position of well cementing material with small-bore opening bit and is transferred band
There is the inclined hole pillar 4 of buckle 5 to fresh coal seam 13, complete safeguard structure and outlet passageway is built.
Due to foring connection gasification coal seam and the outlet passageway of drilling, so coal seam, top before, during and after gasification
Plate have support protect, retaining hole bottom structure it is basicly stable.
Drilling can evenly be pressed by supporting construction using preceding in outlet, prevented collapse hole, and high degree ensure that it
In the stability for building bottom hole in the stove cycle of some months, i.e., completed drilling can be placed for a long time.
Drilling, by superhigh temperature resistant, some outlet inclined holes of high pressure material protection, alleviates thermal effect during outlet use
Be not in sleeve pipe fusing phenomenon during the influence of reply bottom sleeve, outlet, extend the service life of sleeve pipe.
Foot of hole periphery is produced after burned out area, cylindrical entity supporting construction top consolidation roof, bottom consolidation
Bottom plate basement rock, provides support to be at least a range of space of foot of hole, prevents borehole circumference roof strata slump from making
Into blocking.
The safeguard structure work progress is simple, and cost is low, good reliability, it is adaptable to the underground mining of high-temperature gas.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention
God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising including these changes and modification.
Claims (10)
1. a kind of underground coal gasification drill holes foot guard structure, it is characterised in that petroleum casing pipe bottom is surrounded by well cementing material,
The well cementing material, which is offered, is equipped with protecting tube on the hole connected with the petroleum casing pipe, the hole, coal seam is led in the hole.
2. underground coal gasification drill holes foot guard structure according to claim 1, it is characterised in that the hole with it is described
The angle of petroleum casing pipe is predetermined angular.
3. underground coal gasification drill holes foot guard structure according to claim 2, it is characterised in that the predetermined angular
Size is 30 degree to 75 degree.
4. according to any described underground coal gasification drill holes foot guard structure of claims 1 to 3, it is characterised in that described
There is buckle on protecting tube, the buckle is used to the protecting tube being fixed on the petroleum casing pipe.
5. a kind of underground coal gasification drill holes foot guard construction method, it is characterised in that including,
Step S1, in coal seam, adjoining rock and bottom plate basement rock preset range, brill hollows out chamber；
Step S2, decentralization petroleum casing pipe to borehole bottom location, petroleum casing pipe bottom is blocked and bottom end lateral opening hole is some；
Step S3, is cemented the well, and whole jacket exterior cavity is filled by well cementing material；
Step S4, well cementing material is reached after predetermined strength, places plugging material by end hole plug；
Step S5, opens some inclined holes in cylindrical space middle and upper part with opening bit and transfers pillar, complete to fresh coal seam position
Built into safeguard structure and passage.
6. underground coal gasification drill holes foot guard construction method according to claim 5, it is characterised in that described
Well cementing material is suitable for the well cementing material under superhigh temperature, condition of high voltage.
7. underground coal gasification drill holes foot guard construction method according to claim 5, it is characterised in that step
S4, the predetermined strength is compression strength and intensity is not less than 3.5MPa.
8. underground coal gasification drill holes foot guard construction method according to claim 5, it is characterised in that complete
Step S2, the petroleum casing pipe decentralization completes and pressure test is carried out after closure, and the pressure loss carries out step after meeting the requirements
S3。
9. underground coal gasification drill holes foot guard construction method according to claim 5, it is characterised in that bore and dig
The radius of the cavity is 5-10 times of the petroleum casing pipe radius.
10. underground coal gasification drill holes foot guard construction method according to claim 5, it is characterised in that bore
The cavity top is dug apart from coal seam 3-5 meters, 2-3 meters of horizon d is goed deep into the cavity bottom.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710461870.2A CN107100608A (en) | 2017-06-16 | 2017-06-16 | Coal underground gasification drill hole bottom protection structure and construction method |
| CN201810180952.4A CN108343419B (en) | 2017-06-16 | 2018-03-05 | Underground coal gasification drilling bottom protection structure and construction method |
| CN201820300205.5U CN207989012U (en) | 2017-06-16 | 2018-03-05 | A kind of underground coal gasification drill holes foot guard structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710461870.2A CN107100608A (en) | 2017-06-16 | 2017-06-16 | Coal underground gasification drill hole bottom protection structure and construction method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107100608A true CN107100608A (en) | 2017-08-29 |
Family
ID=59659854
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710461870.2A Pending CN107100608A (en) | 2017-06-16 | 2017-06-16 | Coal underground gasification drill hole bottom protection structure and construction method |
| CN201820300205.5U Active CN207989012U (en) | 2017-06-16 | 2018-03-05 | A kind of underground coal gasification drill holes foot guard structure |
| CN201810180952.4A Active CN108343419B (en) | 2017-06-16 | 2018-03-05 | Underground coal gasification drilling bottom protection structure and construction method |
Family Applications After (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820300205.5U Active CN207989012U (en) | 2017-06-16 | 2018-03-05 | A kind of underground coal gasification drill holes foot guard structure |
| CN201810180952.4A Active CN108343419B (en) | 2017-06-16 | 2018-03-05 | Underground coal gasification drilling bottom protection structure and construction method |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108343419A (en) * | 2017-06-16 | 2018-07-31 | 新疆国利衡清洁能源科技有限公司 | A kind of underground coal gasification drill holes foot guard structure and construction method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110714737B (en) * | 2019-11-09 | 2023-06-20 | 中为(上海)能源技术有限公司 | Well cementation system and method for underground coal gasification process |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5477925A (en) * | 1994-12-06 | 1995-12-26 | Baker Hughes Incorporated | Method for multi-lateral completion and cementing the juncture with lateral wellbores |
| CN201292815Y (en) * | 2008-11-03 | 2009-08-19 | 中国石油集团长城钻探工程有限公司 | Floating shoes for cementing oil well |
| GB2501074B (en) * | 2012-04-10 | 2014-08-20 | Portman Energy Ltd | Improved underground coal gasification methods, systems and apparatus |
| CN107100608A (en) * | 2017-06-16 | 2017-08-29 | 新疆国利衡清洁能源科技有限公司 | Coal underground gasification drill hole bottom protection structure and construction method |
-
2017
- 2017-06-16 CN CN201710461870.2A patent/CN107100608A/en active Pending
-
2018
- 2018-03-05 CN CN201820300205.5U patent/CN207989012U/en active Active
- 2018-03-05 CN CN201810180952.4A patent/CN108343419B/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108343419A (en) * | 2017-06-16 | 2018-07-31 | 新疆国利衡清洁能源科技有限公司 | A kind of underground coal gasification drill holes foot guard structure and construction method |
| CN108343419B (en) * | 2017-06-16 | 2024-04-05 | 新疆国利衡清洁能源科技有限公司 | Underground coal gasification drilling bottom protection structure and construction method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108343419A (en) | 2018-07-31 |
| CN108343419B (en) | 2024-04-05 |
| CN207989012U (en) | 2018-10-19 |
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Application publication date: 20170829 |