CN207989012U - A kind of underground coal gasification drill holes foot guard structure - Google Patents
A kind of underground coal gasification drill holes foot guard structure Download PDFInfo
- Publication number
- CN207989012U CN207989012U CN201820300205.5U CN201820300205U CN207989012U CN 207989012 U CN207989012 U CN 207989012U CN 201820300205 U CN201820300205 U CN 201820300205U CN 207989012 U CN207989012 U CN 207989012U
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- China
- Prior art keywords
- hole
- drill holes
- casing pipe
- coal gasification
- foot guard
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- 239000003245 coal Substances 0.000 title claims abstract description 48
- 238000002309 gasification Methods 0.000 title claims abstract description 29
- 239000000463 material Substances 0.000 claims abstract description 35
- 239000003208 petroleum Substances 0.000 claims abstract description 33
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 238000005553 drilling Methods 0.000 abstract description 14
- 238000010276 construction Methods 0.000 abstract description 7
- 238000005065 mining Methods 0.000 abstract description 3
- 239000011435 rock Substances 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000004568 cement Substances 0.000 description 3
- 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
- 241001074085 Scophthalmus aquosus Species 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000007596 consolidation process Methods 0.000 description 2
- 238000010586 diagram Methods 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
- 239000002737 fuel gas Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000012795 verification 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
- 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)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
- Foundations (AREA)
Abstract
The utility model provides a kind of underground coal gasification drill holes foot guard structure, it is characterized in that, petroleum casing pipe bottom is surrounded by well cementing material, the well cementing material offers the hole being connected to the petroleum casing pipe, protecting tube is housed on the hole, coal seam is led in the hole, and the hole and the angle of the petroleum casing pipe are predetermined angular.Drilling can be pressed evenly by supporting construction using preceding in outlet, be prevented collapse hole, high degree from ensure that its stability for building bottom hole in the stove period in some months, i.e., completed drilling can place for a long time.The safeguard structure work progress is simple, at low cost, good reliability, is suitable for the underground mining of high-temperature gas.
Description
Technical field
The utility model is related to underground coal gasification(UCG) production technique fields, in particular to a kind of underground coal gasification(UCG)
Foot of hole safeguard structure.
Background technology
Coal resources can be carried out in-situ retorting by coal underground gasification technology, and be converted into fuel gas, recovery process
In without being manually entered coal working face, and mainly utilize the forms such as gasifying agent and the heat effect of coal, chemical reaction to be formed and react
Working face converts combustible component in coal to effective industrial mixed gas, and mixed gas drains into earth's surface by geotechnical boring, should
Technology has the advantages such as resource-effective, clean environment firendly, safety in production.
In general, after transferring petroleum casing pipe in the geotechnical boring of coal seam top and completing well cementing of cement, that is, complete venthole
Main construction working, coal seam inside do not do the naked state protected essentially, under normal circumstances the service life of a bite venthole
It at least needs 5 years or more, but at the scene in production process, the venthole completed using above-mentioned means was in normal use 1 to two year
Afterwards, under firepower and stress collective effect, roof around bottom hole casing and cementing concrete ring continuously emerges and caves in, conducting top
Plate water-bearing layer blocks outlet passageway, influences process stabilizing operation, drilling is caused to scrap in advance.
Existing country 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 starting the drilling for before producing gas, the protection need to be destroyed in bottom hole
Device does not still play protective action during producing outlet to foot of hole.
Utility model content
In consideration of it, the utility model proposes a kind of underground coal gasification drill holes foot guard structures, for the full longevity that drills
Order the protection in period, it is intended to solve the above problems.
The utility model proposes a kind of underground coal gasification drill holes foot guard structures, which is characterized in that petroleum casing pipe
Bottom is surrounded by well cementing material, and the well cementing material offers the hole being connected to the petroleum casing pipe, and protection is housed on the hole
Coal seam is led in pipe, the hole, and the hole and the angle of the petroleum casing pipe are predetermined angular.
Further, above-mentioned underground coal gasification drill holes foot guard structure, which is characterized in that the predetermined angular size
It is 30 degree to 75 degree.
Further, above-mentioned underground coal gasification drill holes foot guard structure, which is characterized in that the predetermined angular size
It is 55 degree to 65 degree.
Further, above-mentioned underground coal gasification drill holes foot guard structure, which is characterized in that have card on the protecting tube
Button, the buckle by the protecting tube for being fixed on the petroleum casing pipe.
Further, above-mentioned underground coal gasification drill holes foot guard structure, which is characterized in that the well cementing material tolerance
Superhigh temperature, high pressure.
Further, above-mentioned underground coal gasification drill holes foot guard structure, which is characterized in that the pressure resistance of well cementing material
Degree is not less than 3.5MPa.
Further, above-mentioned underground coal gasification drill holes foot guard structure, which is characterized in that the well cementing material radius
It is 5-10 times of the petroleum casing pipe radius.
Further, above-mentioned underground coal gasification drill holes foot guard structure, which is characterized in that the well cementing material top
Apart from coal seam 3-5 meters, which gos deep into 2-3 meters of horizon d.
The beneficial effects of the utility model：
Due to foring the outlet passageway in connection gasification coal seam and drilling, so coal seam, top before, during and after gasification
Plate have support protect, retaining hole bottom structure it is basicly stable.
Drilling can be pressed evenly by supporting construction using preceding in outlet, be prevented collapse hole, high degree from ensure that it
In the stability for building bottom hole in the stove period of some months, i.e., completed drilling can place for a long time.
Drilling, by superhigh temperature resistant, several outlet inclined holes of high pressure material protection, alleviates thermal effect during outlet use
The influence of bottom sleeve is coped with, is not in casing fusing phenomenon during outlet, extends the service life of casing.
After foot of hole periphery generates burned out area, cylindrical entity supporting construction top consolidates roof, lower part consolidation
Bottom plate basement rock provides support to be at least a certain range of space of foot of hole, prevents borehole circumference roof strata slump from making
At blocking.
The safeguard structure work progress is simple, at low cost, good reliability, is suitable for the underground mining of high-temperature gas.
Description of the drawings
By reading the detailed description of hereafter preferred embodiment, various other advantages and benefit are common for this field
Technical staff will become clear.Attached drawing only for the purpose of illustrating preferred embodiments, and is not considered as to this practicality
Novel limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings：
Fig. 1 is the utility model venthole overall structure diagram；
Fig. 2 is the utility model venthole foot guard structural schematic diagram；
Wherein：1- petroleum casing pipes, 2- side walls 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 end side opening, 10- the 4th are table soil, 11- rocks
Layer (roof and floor), the water-bearing layers 12-, the coal seams 13-, 14- horizon ds.
Specific implementation mode
The exemplary embodiment of the disclosure is more fully described below with reference to accompanying drawings.Although showing the disclosure in attached drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
It is 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
Completely it is communicated to those skilled in the art.It should be noted that in the absence of conflict, the implementation in the utility model
Feature in example and embodiment can be combined with each other.It is below with reference to the accompanying drawings and in conjunction with the embodiments new this practicality is described in detail
Type.
As shown in Figure 1, 2, a kind of underground coal gasification drill holes foot guard structure includes mainly：Petroleum casing pipe 1, side wall
Well cementing material 2, petroleum casing pipe side opening are several 3, inclined hole pillar is several 4, inclined hole pillar buckle 5, cylindrical cavity 6, well cementing material
7, plugging material 8, petroleum casing pipe bottom end side opening several 9.
Petroleum casing pipe bottom is surrounded by well cementing material 7, and the well cementing material 7, which is offered, to be connected to the petroleum casing pipe
Hole is equipped with protecting tube on the hole, which leads to coal seam.
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.Into
It is preferably one step 55 degree to 65 degree, is more convenient for constructing.
There is buckle 5 on protecting tube 4, the buckle 5 by the protecting tube 5 for 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
13, 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 is hollowed out in coal seam, adjoining rock and bottom plate basement rock a certain range using reducing reaming bit brill
Chamber；
Step S2, decentralization petroleum casing pipe to borehole bottom location, if petroleum casing pipe bottom blocks and bottom end lateral opening hole
It is dry,
Step S3, cements the well, and entire jacket exterior cavity is made to be filled by well cementing material；
Step S4 after well cementing material reaches predetermined strength, places plugging material by end hole plug；
Step S5 opens several inclined holes in cylindrical space middle and upper part with opening bit and transfers pillar, until fresh coal seam portion
Safeguard structure and channel structure are completed in position.
It is of course also possible to be transformed for the open-hole excavated, the process of above-mentioned brill digging open-hole is saved, but for
Open-hole depth is unsatisfactory for the further ground auger of desired needs and digs until piercing 142-3 meters of horizon d.
Step S1, using reducing reaming bit from roof strata 11 in coal seam 3-5 meters of range (concrete numerical value depends 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, and hole radius is 5-10 times of open-hole radius, and open-hole diameter is close with petroleum casing pipe diameter
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 end hole 9 is transferred.Petroleum casing pipe is placed steady
After fixed, decentralization plugging material 8 blocks petroleum casing pipe bottom end hole 9, pressurization verification casing seal, after the pressure loss meets the requirements
Take out plugging material 8.Well cementing material 7 is passed through into the gap between the indentation stratum of bottom end side opening 9 and petroleum casing pipe 1.This programme is adopted
It is cemented the well and (is suitable under superhigh temperature, condition of high voltage if there is other with G grades or more oil-well cement and corresponding material grain composition
Well cementing material can also be used as alternative solution).
Well cementing material is waited solidifying 12-24 hour, and when its compression strength is not less than 3.50MPa, transfers plugging material 8 by oil
Casing shoe hole 9 blocks, and opens several side openings 3 in the middle and upper part certain position of well cementing material with small-bore opening bit and transfers band
There is the inclined hole pillar 4 of buckle 5 to fresh coal seam 13, completes safeguard structure and outlet passageway structure.
Due to foring the outlet passageway in connection gasification coal seam and drilling, so coal seam, top before, during and after gasification
Plate have support protect, retaining hole bottom structure it is basicly stable.
Drilling can be pressed evenly by supporting construction using preceding in outlet, be prevented collapse hole, high degree from ensure that it
In the stability for building bottom hole in the stove period of some months, i.e., completed drilling can place for a long time.
Drilling, by superhigh temperature resistant, several outlet inclined holes of high pressure material protection, alleviates thermal effect during outlet use
The influence of bottom sleeve is coped with, is not in casing fusing phenomenon during outlet, extends the service life of casing.
After foot of hole periphery generates burned out area, cylindrical entity supporting construction top consolidates roof, lower part consolidation
Bottom plate basement rock provides support to be at least a certain range of space of foot of hole, prevents borehole circumference roof strata slump from making
At blocking.
The safeguard structure work progress is simple, at low cost, good reliability, is suitable for the underground mining of high-temperature gas.
Obviously, those skilled in the art can carry out the utility model various modification and variations without departing from this practicality
Novel spirit and scope.If in this way, these modifications and variations of the present invention belong to the utility model claims and
Within the scope of its equivalent technologies, then the utility model is also intended to include these modifications and variations.
Claims (8)
1. a kind of underground coal gasification drill holes foot guard structure, which is characterized in that petroleum casing pipe bottom is surrounded by well cementing material,
The well cementing material offers the hole being connected to the petroleum casing pipe, protecting tube is housed on the hole, which leads to coal seam, the hole
Angle with the petroleum casing pipe is predetermined angular.
2. underground coal gasification drill holes foot guard structure according to claim 1, which is characterized in that the predetermined angular
Size is 30 degree to 75 degree.
3. underground coal gasification drill holes foot guard structure according to claim 1, which is characterized in that the predetermined angular
Size is 55 degree to 65 degree.
4. underground coal gasification drill holes foot guard structure according to any one of claims 1 to 3, which is characterized in that described
There is buckle on protecting tube, the buckle by the protecting tube for being fixed on the petroleum casing pipe.
5. underground coal gasification drill holes foot guard structure according to claim 1, which is characterized in that the well cementing material
It is resistant to superhigh temperature, high pressure.
6. underground coal gasification drill holes foot guard structure according to claim 1 or 5, which is characterized in that well cementing material
Compression strength be not less than 3.5MPa.
7. underground coal gasification drill holes foot guard structure according to claim 1, which is characterized in that the well cementing material
Radius is 5-10 times of the petroleum casing pipe radius.
8. underground coal gasification drill holes foot guard structure according to claim 1, which is characterized in that the well cementing material
Apart from coal seam 3-5 meters, which gos deep into 2-3 meters of horizon d on top.
Applications Claiming Priority (2)
| 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 |
| CN2017104618702 | 2017-06-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207989012U true CN207989012U (en) | 2018-10-19 |
Family
ID=59659854
Family Applications (3)
| 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 |
| CN201810180952.4A Active CN108343419B (en) | 2017-06-16 | 2018-03-05 | Underground coal gasification drilling 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 |
Family Applications Before (2)
| 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 |
| CN201810180952.4A Active CN108343419B (en) | 2017-06-16 | 2018-03-05 | Underground coal gasification drilling bottom protection structure and construction method |
Country Status (1)
| Country | Link |
|---|---|
| CN (3) | CN107100608A (en) |
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 CN201810180952.4A patent/CN108343419B/en active Active
- 2018-03-05 CN CN201820300205.5U patent/CN207989012U/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 |
| CN107100608A (en) | 2017-08-29 |
| CN108343419B (en) | 2024-04-05 |
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