CN108086957A - A kind of method of the U-shaped coal bed gas well construction in double coal seams - Google Patents
A kind of method of the U-shaped coal bed gas well construction in double coal seams Download PDFInfo
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- CN108086957A CN108086957A CN201711411010.4A CN201711411010A CN108086957A CN 108086957 A CN108086957 A CN 108086957A CN 201711411010 A CN201711411010 A CN 201711411010A CN 108086957 A CN108086957 A CN 108086957A
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- 239000003245 coal Substances 0.000 title claims abstract description 108
- 238000010276 construction Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000005065 mining Methods 0.000 claims abstract description 16
- 238000005553 drilling Methods 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 3
- 239000011152 fibreglass Substances 0.000 claims description 2
- 238000003032 molecular docking Methods 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 7
- 238000000605 extraction Methods 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 11
- 238000010586 diagram Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 241000167854 Bourreria succulenta Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 235000019693 cherries Nutrition 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000003325 tomography Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002699 waste material Substances 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
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- Environmental & Geological Engineering (AREA)
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Abstract
The present invention relates to coal bed gas and coal mining technologies, the problems such as existing input is big when using conventional u-shaped well construction for the coal field comprising upper and lower two kinds of coal seams, the wasting of resources, extraction efficiency are low, the present invention provides a kind of methods of double U-shaped coal bed gas well constructions in coal seam, two layers of different purpose coal seam is drilled into using 1 mouthful of U-shaped well, and mining is carried out using with 1 mouthful of vertical well；It first constructs during construction vertical well, U-shaped well of constructing afterwards；Vertical well drives a well body structure using two, and U-shaped well drives a well body structure using three, and the three of U-shaped well drives a well after figure orientation is docked to vertical well, extends to projected depth forward.Double U-shaped well construction costs in coal seam are less than traditional common u-shaped well, can save the engineering cost of 1 mouthful of vertical well, and 1 mouthful of U-shaped well can produce the coal bed gas of two layers of coal, and economic benefit is apparent.
Description
Technical field
The present invention relates to coal bed gas and coal mining technologies, are specially the side that a kind of U-shaped coal bed gas well in double coal seams is constructed
Method.
Background technology
Due to the geological characteristics of some coal fields, comprising upper and lower two kinds of coal seams, simultaneous beam loess hills rises and falls, ravines and guillies criss-cross
The features such as, cause well location selection difficult, according to traditional U-shaped well construction, at least need 1 mouthful of engineering well and 1 mouthful of mining well, together
When also need to two well sites and corresponding road, project inputs are larger, serious waste soil, while extraction efficiency is relatively low.
The content of the invention
The present invention for the coal field comprising upper and lower two kinds of coal seams existing input when using conventional u-shaped well construction it is big,
The problems such as the wasting of resources, extraction efficiency is low, and then the method for providing a kind of U-shaped coal bed gas well construction in double coal seams.
The present invention adopts the following technical scheme that：
A kind of method of the U-shaped coal bed gas well construction in double coal seams, is drilled into two layers of different purpose coal seam using 1 mouthful of U-shaped well, and uses
Mining is carried out with 1 mouthful of vertical well；It first constructs during construction vertical well, U-shaped well of constructing afterwards；Vertical well drives a well body structure using two, U-shaped
Well drives a well body structure using three, and the three of U-shaped well drives a well after figure orientation is docked to vertical well, extends to projected depth forward.
According to U-shaped well three drive a well figure and the docking location of vertical well be divided into near-end dock U-shaped well and distal end dock it is U-shaped
Well, U-shaped well three drive a well the first section of body when being docked with vertical well and dock U-shaped well for near-end, U-shaped well three drive a well body endpiece with hanging down
When straight well docks U-shaped well is docked for distal end；
The near-end docks the two of U-shaped well and drives a well the landing point position on purpose coal seam（A, B point in Fig. 1）In purpose coal seam
Middle and lower part, subsequent three open the beginning after vertical well creeps into along going up a slope；
Dock two landing points to drive a well on purpose coal seam of U-shaped well in the distal end（C, D point in Fig. 2）Positioned at purpose coal seam
Middle and upper part, subsequent three start to creep into along descending.
The two of the U-shaped well open drilling process include deflecting, 3 stages of increasing hole angle and hold angle, kickoff point (KOP) opened two after 30 ~
50m then begins to increasing hole angle, and hold angle makes 90 degree of the landing point hole deviation infinite approach into after purpose coal seam.
Build angle rate in build-up process is no more than 15 °.
The two of vertical well spud in is into work progress：
One opens：Horizon d 10m, tripping in surface pipe are drilled into using drill bit, cementing concrete returns up to ground；
Two open：30m below lower purpose coal seam, tripping in production casing are drilled into using drill bit, cementing concrete returns up to upper purpose coal seam
More than 200m；The tripping in glass reinforced plastic pipe in upper purpose coal seam and lower purpose coal seam then carries out making cave reaming.
The three of U-shaped well spud in is into work progress：
One opens：Horizon d 10m, tripping in surface pipe are drilled into using drill bit, cementing concrete returns up to ground；
Two open：It is drilled into upper purpose coal seam and lower purpose coal seam, tripping in protective casing respectively using drill bit, cementing concrete is returned on up to
Purpose coal seam more than 200m；
Three open：It is docked to after vertical well and crept into forward again to projected depth using geosteering along two purpose coal seams using drill bit.
The innovative point of the present invention is 2 groups of traditional U-shaped wells merging into 1 group of U-shaped well, be closed by 2 mouthfuls of original engineering wells
And construct in 1 wellbore, and reduce by 1 mouthful of mining vertical well, it has the advantages that：
（1）For mountain area mountain ridge landform, well site and road are reduced；
（2）Mining vertical well well number is reduced, reduces project inputs；
（3）Block coal bed gas well in Jincheng has bored 2500 mouthfuls of wells at present, can bore that region is less, on the basis for economizing on resources floor space
On, reasonable development coal bed gas resource increases methane output.
2）Change popularization and application situation or expected popularization situation
U-shaped well can also be constructed into multi-branched horizontal well, and vertical well can be used and do not drill 15# coal seams, and another mouthful of purpose coal seam is
The U-shaped well in 15# coal seams uses the direct mining of jet pump.
（1）It is tested in Jincheng Mining Area different coal region, well bore design and construction technique is specifically adjusted according to live,
Different constructions are then promoted according to different coal；
（2）And then it may extend to the similar mining area in Shanxi Province or even the whole nation, the use of similar coal seam.
3）Economic benefit and social benefit
（1）Double U-shaped well construction costs in coal seam are less than traditional common u-shaped well, save about 400,000 yuan of the engineering cost of 1 mouthful of vertical well,
And 1 mouthful of U-shaped well can produce the coal bed gas of two layers of coal, economic benefit is apparent.
（2）Promote coal bed gas resource utilization, while exploit the coal bed gas of two layers of coal, save the extraction time, ensure coal
Ore deposit safety, has good safety benefit.
（3）Substantial amounts of extraction coal bed gas can effectively supplement the energy, advantageously reduce greenhouse gas emission, have significant
Social benefit.
Description of the drawings
Fig. 1 is the constructing structure schematic diagram that near-end docks U-shaped well；
Fig. 2 is the constructing structure schematic diagram that U-shaped well is docked in distal end；
A/B/C/D- landing points.
Specific embodiment
With reference to attached drawing, the specific embodiment of the present invention is described further：
Using 1 mouthful of U-shaped well and 1 mouthful of vertical well in this method, 1 mouthful of U-shaped well is constructed in same wellbore, be drilled into two layers it is different
Purpose coal seam, and share 1 vertical well and carry out mining.It first constructs vertical well, U-shaped well of constructing afterwards, U-shaped well three opens horizontal segment orientation
After being docked to vertical well, projected depth is extended to forward.
By taking the Permian System 3# coal seams in somewhere and Carboniferous System 15# coal seams as an example, 3# coal average layer thickness 6m（Upper purpose coal seam）,
15# coal average layer thickness 4m（Lower purpose coal seam）, coal measure strata is generally an east northeast to inclined monoclinal structure, and stratigraphic dip is general
For 5 ° or so, wide slow secondary fold is relatively developed, and tomography is rare and small in block, suitable for U-shaped horizontal well operations；This area
It is most of to be covered for loess, and beam loess hills rises and falls, ravines and guillies criss-cross, well location selection is difficult；Conventional u-shaped well needs 1 mouthful of engineering well and 1 mouthful
Mining well, and need 2 well sites and corresponding road.
It for the ground coal seam conditions, is constructed using the method for the invention, there is near-end to dock U-shaped well and remote in Specific construction
Dock U-shaped 2 kinds of well in end.
（1）Near-end docks U-shaped well
It first constructs vertical well（Mining well）, U-shaped well of constructing afterwards（Engineering well）, U-shaped well three open horizontal segment orientation be docked to vertical well
Afterwards, projected depth is extended to forward.
Vertical well：It drives a well body structure using two, wherein an exploitation is drilled into horizon d 10m, tripping in the drill bit of 311.15mm
The surface pipe of 244.5mm, cementing concrete return up to ground；Two exploitations are drilled into 30m below 15# coal seams with the drill bit of 215.9mm,
The production casing of tripping in 177.8mm, cementing concrete return up to 3# coal seams more than 200m；3# coal seams and 15# coal seams can tripping in glass
Steel pipe then carries out making cave reaming.
U-shaped well：It drives a well body structure using three, wherein an exploitation is drilled into horizon d 10m, tripping in the drill bit of 311.15mm
The surface pipe of 244.5mm, cementing concrete return up to ground；Two exploitations are drilled into 3# coal seams or 15# coals with the drill bit of 215.9mm
Layer, the protective casing of tripping in 177.8mm, cementing concrete return up to 3# coal seams more than 200m, and two open and can divide by drilling technology
For deflecting, increasing hole angle, 3 stages of hold angle, if repeating deflecting and increasing hole angle section when well is deeper, the coal for the 400m that is averaged according to Jincheng Mining Area
Layer buried depth, 30 ~ 50m after kickoff point (KOP) is generally opened two then begins to increasing hole angle, into coal seam after landing point hole deviation close to 90 degree, make
Slope is determined according to specific well depth, is usually no more than 15 °；Three exploitations utilize geosteering with 152.4mm drill bits along purpose coal seam
It is docked to after vertical well and creeps into forward to projected depth again, according to the soft or hard degree in coal seam, cherry coal can the prefabricated slot production set of tripping in
Pipe（Stainless steel tube or pvc pipe）, so that the later stage carries out fracturing yield increasing transformation.For ease of later stage mining, two open landing point in coal seam
Middle and lower part, subsequent three open the beginning after vertical well, along drilling of going up a slope, determines specific according to specific coal seam thickness and horizontal section length
Inclination angle.Since U-shaped well straight well section is using same wellbore, therefore subdrilling 15# coal seams, subsequent tripping in separator again, since two
When, that is, side-drilling windowing progress 3# drilling in coal, it is opened using after casing guide tripping in casing two at well cementation to windowing, then takes out and divide
Every device, finishing drilling.
（2）Dock U-shaped well in distal end
Distal end docks U-shaped well and equally first constructs vertical well（Mining well）, U-shaped well of constructing afterwards（Engineering well）, U-shaped well three opens horizontal segment
Vertical well is docked to using geosteering extension.
Vertical well：The vertical well of U-shaped well is docked with near-end.
U-shaped well：The U-shaped well of U-shaped well is docked with near-end, for ease of later stage mining, two open landing point in coal seam middle and upper part, with
Three start to creep into along descending afterwards, specific inclination angle are determined according to specific coal seam thickness and horizontal section length, followed by geosteering
Extension is docked to vertical well.
Claims (6)
- A kind of 1. method of the U-shaped coal bed gas well construction in double coal seams, it is characterised in that：Two layers of different mesh is drilled into using 1 mouthful of U-shaped well Coal seam, and carry out mining using with 1 mouthful of vertical well；It first constructs during construction vertical well, U-shaped well of constructing afterwards；Vertical well uses two Drive a well body structure, and U-shaped well drives a well body structure using three, and the three of U-shaped well drives a well after figure orientation is docked to vertical well, extends forward To projected depth.
- 2. the method for the U-shaped coal bed gas well construction in double coal seams according to claim 1, it is characterised in that：It is opened according to U-shaped well three Well bore section and the docking location of vertical well are divided into that near-end docks U-shaped well and U-shaped well is docked in distal end, and U-shaped well three drives a well the first section of body Dock U-shaped well when being docked with vertical well for near-end, U-shaped well three drive a well when the endpiece of body dock with vertical well be distally dock it is U-shaped Well；Two landing points to drive a well on purpose coal seam that the near-end docks U-shaped well are located at purpose coal seam middle and lower part, and subsequent three It opens and starts after vertical well along drilling of going up a slope；Two landing points to drive a well on purpose coal seam that U-shaped well is docked in the distal end are located at purpose coal seam middle and upper part, and subsequent three Start to creep into along descending.
- 3. the method for the U-shaped coal bed gas well construction in double coal seams according to claim 2, it is characterised in that：The two of the U-shaped well Opening drilling process includes deflecting, 3 stages of increasing hole angle and hold angle, and 30 ~ 50m after kickoff point (KOP) is opened two then begins to increasing hole angle, and hold angle Make 90 degree of the landing point hole deviation infinite approach into after purpose coal seam.
- 4. the method for the U-shaped coal bed gas well construction in double coal seams according to claim 3, it is characterised in that：In build-up process Build angle rate is no more than 15 °.
- 5. the method for the U-shaped coal bed gas well construction in double coal seams according to claim 4, which is characterized in that the two of vertical well open Drilling construction process is：One opens：Horizon d 10m, tripping in surface pipe are drilled into using drill bit, cementing concrete returns up to ground；Two open：30m below lower purpose coal seam, tripping in production casing are drilled into using drill bit, cementing concrete returns up to upper purpose coal seam More than 200m；The tripping in glass reinforced plastic pipe in upper purpose coal seam and lower purpose coal seam then carries out making cave reaming.
- 6. the method for the U-shaped coal bed gas well construction in double coal seams according to claim 5, which is characterized in that the three of U-shaped well spud in It is into work progress：One opens：Horizon d 10m, tripping in surface pipe are drilled into using drill bit, cementing concrete returns up to ground；Two open：It is drilled into upper purpose coal seam and lower purpose coal seam, tripping in protective casing respectively using drill bit, cementing concrete is returned on up to Purpose coal seam more than 200m；Three open：It is docked to after vertical well and crept into forward again to projected depth using geosteering along two purpose coal seams using drill bit.
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| CN201711411010.4A CN108086957A (en) | 2017-12-23 | 2017-12-23 | A kind of method of the U-shaped coal bed gas well construction in double coal seams |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110318662A (en) * | 2019-07-10 | 2019-10-11 | 台州长天能源技术有限公司 | Gravity head beats U-shaped well method device product |
| CN111119789A (en) * | 2019-12-30 | 2020-05-08 | 河南工程学院 | Well completion method for coal bed gas ground L-shaped pre-pumping well with double-well-opening structure |
| CN112081558A (en) * | 2020-10-10 | 2020-12-15 | 西安科技大学 | Coal underground gasification and coalbed methane collaborative mining method, structure and construction method |
| CN112160738A (en) * | 2020-09-18 | 2021-01-01 | 西安交通大学 | Well arrangement structure for underground in-situ pyrolysis of coal and construction method thereof |
| CN113107589A (en) * | 2021-04-14 | 2021-07-13 | 中煤科工集团西安研究院有限公司 | Method for pre-draining water in advance on ground of coal seam roof aquifer |
| CN113153146A (en) * | 2021-01-06 | 2021-07-23 | 北京奥瑞安能源技术开发有限公司 | Communicated horizontal well and drilling method thereof |
| CN113605874A (en) * | 2021-08-10 | 2021-11-05 | 山西蓝焰煤层气集团有限责任公司 | Method for extracting coal bed gas of broken soft coal bed top and bottom double-layer horizontal well |
| CN114607318A (en) * | 2022-03-24 | 2022-06-10 | 中煤科工集团西安研究院有限公司 | Fracturing cooperative construction method for combined production and drilling of multi-layer horizontal well for deep coal bed methane |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110318662A (en) * | 2019-07-10 | 2019-10-11 | 台州长天能源技术有限公司 | Gravity head beats U-shaped well method device product |
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| CN112160738A (en) * | 2020-09-18 | 2021-01-01 | 西安交通大学 | Well arrangement structure for underground in-situ pyrolysis of coal and construction method thereof |
| CN112081558A (en) * | 2020-10-10 | 2020-12-15 | 西安科技大学 | Coal underground gasification and coalbed methane collaborative mining method, structure and construction method |
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| CN113107589B (en) * | 2021-04-14 | 2023-08-15 | 中煤科工集团西安研究院有限公司 | Advanced pre-drainage method for coal seam roof aquifer ground |
| CN113605874A (en) * | 2021-08-10 | 2021-11-05 | 山西蓝焰煤层气集团有限责任公司 | Method for extracting coal bed gas of broken soft coal bed top and bottom double-layer horizontal well |
| CN113605874B (en) * | 2021-08-10 | 2023-02-10 | 山西蓝焰煤层气集团有限责任公司 | Method for extracting coal bed gas of broken soft coal bed top and bottom double-layer horizontal well |
| CN114607318A (en) * | 2022-03-24 | 2022-06-10 | 中煤科工集团西安研究院有限公司 | Fracturing cooperative construction method for combined production and drilling of multi-layer horizontal well for deep coal bed methane |
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