CN107401393A - Water pumping gas production integration goaf gas extraction well casing programme and its construction method - Google Patents
Water pumping gas production integration goaf gas extraction well casing programme and its construction method Download PDFInfo
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- CN107401393A CN107401393A CN201710638178.2A CN201710638178A CN107401393A CN 107401393 A CN107401393 A CN 107401393A CN 201710638178 A CN201710638178 A CN 201710638178A CN 107401393 A CN107401393 A CN 107401393A
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- well
- sleeve pipe
- goaf
- water
- gas
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/006—Production of coal-bed methane
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
Abstract
The invention belongs to coal mine gob gas ground extraction technical field, specifically water pumping gas production integration goaf gas extraction well casing programme and its construction method.Solve while discharge water in gob area and the technical problem of extraction goaf gas, including well depth structure division and environment division, wherein well depth structure division drives sleeve pipe including being arranged on the one of the superiors, one, which opens sleeve bottom connection two, drives sleeve pipe, two open the depth location that sleeve pipe is arranged on water-bearing layer, two, which open sleeve bottom connection three, drives screen casing, and three open the depth location that screen casing is arranged on goaf and fissure zone, and three bottoms for driving screen casing are arranged on bottom hole location；Environment division includes being arranged on one and drives sleeve pipe, two drives sleeve pipe and three open oil pipe in screen casing, delivery port is provided with the top of oil pipe, oil pipe bottom is provided with draining pump, oil pipe bottom is provided with water sucking mouth, one to open cannula tip be well head, oil pipe suspension and sealing device are provided with pithead position, gas pumping pump connects with well head.The dual-purpose function of the achievable well of the present invention.
Description
Technical field
The invention belongs to coal mine gob gas ground extraction technical field, specifically a kind of water pumping gas production integration is mined out
Area's gas pumping well casing programme and its construction method.
Background technology
Coal mine gas main component is CH4（Methane）, it is a kind of with the cleaning of coal association, high efficient energy sources.After coal mining
In the goaf of formation, still preservation has substantial amounts of gas, is available for continuing methane drainage and utilization project.Due to CH4（Methane）Density is less than sky
Gas, is generally preferentially accumulated in roof fracture band and goaf top, compare underground extraction by the extraction of ground drilling mode, tool
Have extraction concentration it is high, using the easy, advantage such as cost is low, be a tool emerging field with broad prospects for development.Britain, moral
State, the U.S. have formd related industry, and state key experiment is still adopted altogether in starting and exploratory stage, coal with coal bed gas by China
Correlation technique is developed in room.
Gas mainly exists with free state and ADSORPTION STATE in goaf, and preservation is in crevice space in goaf and residual coal
In, reservoir pressure is very low, only kPa levels.CH4（Methane）Desorbed naturally from residual coal under concentration and barometric gradient driving, be
The main path of goaf free state gas supply.Residual coal is by ponding once flooded in goaf, and its natural desorption process is by pole
It is big to weaken until stop, causing gas pumping well production to decline rapidly until not aerogenesis.Therefore, it is necessary to discharge goaf inner product
Water, continuous, stable aerogenesis could be realized.Need to construct respectively single gully and gas pumping in mine diverse location in the past
Well, drilling well investment and later stage operation expense are higher.
The content of the invention
The present invention is in order to solve the technical problem for discharging water in gob area and extraction goaf gas simultaneously, there is provided a kind of
Water pumping gas production integration goaf gas extraction well casing programme.
Following technical scheme is taken in this practicality：A kind of water pumping gas production integration goaf gas extraction well casing programme, bag
Well depth structure division and environment division are included, wherein well depth structure division drives sleeve pipe including being arranged on the one of the superiors, and one drives sleeve pipe
Sleeve pipe is driven in bottom connection two, and two open the depth location that sleeve pipe is arranged on water-bearing layer, and two, which open sleeve bottom connection three, drives screen casing, and three open
Screen casing is arranged on the depth location of goaf and fissure zone, and three bottoms for driving screen casing are arranged on bottom hole location；Environment division includes
It is arranged on one drive sleeve pipe, two drive sleeve pipe and three open oil pipe in screen casing, delivery port is provided with the top of oil pipe, oil pipe bottom, which is provided with, arranges
Water pump, oil pipe bottom are provided with water sucking mouth, and one to open cannula tip be well head, and oil pipe suspension and sealing device are provided with pithead position,
Gas pumping pump connects with well head.
One diameter for driving sleeve pipe is more than two diameters for driving sleeve pipe.Two diameters for driving sleeve pipe are more than three diameters for driving screen casing.
A kind of construction method of water pumping gas production integration goaf gas extraction well casing programme, is comprised the following steps that, one
Spudding well uses D311.15mm drill bits, is drilled into 10m in the firm horizon d under earth's surface unconsolidated formation, to avoid sleeve pipe from sinking, loosely
Layer caves in, seeped water, then tripping in D273.05mm casing cementings；
Two spudding wells use D241.3mm drill bits, bore and are only bored immediately after meeting above goaf crack, are particularly being drilled into coal seam top
To slow down drilling speed after plate above 100m, then G.I.H endoscope finds out quantity, the depth in water-bearing layer above fissure zone, then
The long stoppers of 0.5m, yellow sand closure are inserted successively upwards from two spudding well bottoms, and the depth that yellow sand is inserted is until bottom one layer aqueous
At the 1m of layer lower section, artificial bottom of a well is formed, it is complete then to reach sealing up to earth's surface tripping in D193.7mm casing cementings from artificial bottom of a well
The purpose in portion water-bearing layer；
Three spudding wells use D171.5mm drill bits, drill through two open lower Yellow sand, stopper after continue, to gob well, to drill successively
Fissure zone, caving zone, goaf space, until 15m finishing drillings below seat earth, then from two open in sleeve bottom at 2m up to
Bottom hole, tripping in D139.7mm sieve tube completions；
It is drilled into below seat earth to carry drilling tool and drill bit to two after 15m and opens in sleeve pipe, respectively at 1 hour, 6 hours, 12 hours
Lower probing bottom afterwards, is such as hampered, then continues drifting to shaft bottom from the depth that is hampered, to ensure that the borehole wall is in metastable state, such as well
Wall can keep 12 hours stabilizations, then all propose that drilling tools start tripping in D139.7mm sieve tube completions；
After completion, according to goaf inner product water and the difference of required displacement, tripping in oil well pump, electric submersible pump or screw rod in hole
Pumping arranges water in gob area, and ponding drains into earth's surface after pumping is arranged along oil pipe, gas in goaf and fissure zone, then via screen casing
Annular space between eyelet, oil-pipe external wall and internal surface of sleeve pipe, extracted by the negative pressure extraction equipment on ground, reach gas production purpose.
Compared with prior art, the invention has the advantages that：1st, individually construction pumped well and gas is avoided to take out
Well is adopted, the effect of two kinds of well type has been reached with a kind of well type, saves drilling well and operation expense；2nd, can effectively sealing it is mined out
Water-bearing layer above area's fissure zone, goaf overlying water-bearing stratum water burst is avoided to flow into goaf；3rd, can solve inbreak in goaf
The collapse hole blockage problem that rubble accumulation is brought, keeps pit shaft to consolidate, realizes pit shaft and fissure zone, the continuous and effective in goaf space
Connection；4th, in pit shaft while tripping in draining pump drainage, on ground using accumulated methane in negative pressure equipment extraction goaf, realize
Gas-water separation, air water are adopted altogether.
For synthesis, the well structure design is reasonable, can realize that water in gob area pump-drainage well and goaf gas are taken out simultaneously
The function of the class well of well two is adopted, the using effect of two mouthfuls of wells is reached with a bite well, effectively reduces cost of investment.
Brief description of the drawings
Fig. 1 is schematic structural view of the invention；
1- mono- drives sleeve pipe in figure, and 2- bis- drives sleeve pipe, and 3- tri- opens screen casing, 4- water-bearing layers, 5- goafs and fissure zone, 6- goafs product
Water, 7- shaft bottoms, a-, b- oil pipe suspensions and sealing device, c- well heads, d- gas pumping pumps, e- oil pipes, f- draining pumps, g- water suctions
Mouthful.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
As shown in figure 1, a kind of water pumping gas production integration goaf gas extraction well casing programme, including well depth structure division
And environment division, wherein well depth structure division drive sleeve pipe 1 including being arranged on the one of the superiors, one, which opens the bottom of sleeve pipe 1 connection two, opens
Sleeve pipe 2, two open the depth location that sleeve pipe 2 is arranged on water-bearing layer 4, and two, which open the bottom of sleeve pipe 2 connection three, drives screen casing 3, and three, which drive screen casing 3, sets
The depth location in goaf and fissure zone 5 is put, three bottoms for driving screen casing 3 are arranged on the position of shaft bottom 7；Environment division includes setting
Drive sleeve pipe 1, two one and drive sleeve pipe 2 and three and open oil pipe e in screen casing 3, be provided with delivery port a at the top of oil pipe e, oil pipe e bottoms are set
Have a draining pump f, oil pipe e bottoms are provided with water sucking mouth g, and one to open the top of sleeve pipe 1 be well head c, well head c opening positions provided with oil pipe suspension and
Sealing device b, gas pumping pump d connect with well head c.One diameter for driving sleeve pipe 1 is more than two diameters for driving sleeve pipe 2.Two drive sleeve pipe 2
Diameter be more than three diameters for driving screen casing 3.
Using three spudding well techniques.
Comprise the concrete steps that：
One opens：Using D311.15mm drill bits, 10m in the firm horizon d under earth's surface unconsolidated formation is drilled into, to avoid sleeve pipe from sinking,
Unconsolidated formation caves in, seeped water, then tripping in D273.05mm casing cementings；
Two open：Using D241.3mm drill bits, bore and only bored immediately after meeting above goaf crack.Particularly be drilled into roof with
To slow down drilling speed after upper 100m, pay attention to observation leakage.Judge whether that it is drilling circulation medium to bore the standard for meeting fissure zone（Drilling fluid
Or compressed air）Significantly leakage occurs.Then G.I.H endoscope finds out quantity, the depth in water-bearing layer above fissure zone, with
Insert the long stoppers of 0.5m, yellow sand closure successively upwards from two hole on bottom afterwards, the depth that yellow sand is inserted is until bottom one layer aqueous
At the 1m of layer lower section, artificial bottom of a well is formed, it is complete then to reach sealing up to earth's surface tripping in D193.7mm casing cementings from artificial bottom of a well
The purpose in portion water-bearing layer；
Three open：Using D171.5mm drill bits, drill through two open lower Yellow sand, stopper after continue, to gob well, to drill split successively
Gap band, caving zone, goaf space, until 15m finishing drillings below seat earth.Then opened from two in sleeve bottom at 2m up to hole
Bottom, tripping in D139.7mm sieve tube completions.Screen casing plays a part of protecting hole wall, prevents from caving in, the eyelet of screen casing as pit shaft and
Fissure zone, the passage of goaf connection.
To ensure the smooth tripping in of screen casing, it is drilled into below seat earth to carry drilling tool and drill bit to two after 15m and opens in sleeve pipe, point
Lower probing bottom, is such as hampered not after 1 hour, 6 hours, 12 hours, then continues drifting to shaft bottom from the depth that is hampered, to ensure the borehole wall
In metastable state.As the borehole wall can keep 12 hours stabilizations（Lower probing bottom is not hampered）, then under all proposing that drilling tool starts
Enter D139.7mm sieve tube completions.
After completion, according to goaf inner product water and the difference of required displacement, in hole tripping in oil well pump, electric submersible pump or
Screw pump pump drainage water in gob area, ponding drain into earth's surface after pumping is arranged along oil pipe, reach draining purpose.Goaf and fissure zone
Interior gas, then the annular space between screen openings, oil-pipe external wall and internal surface of sleeve pipe, is taken out by the negative pressure extraction equipment on ground
Take, reach gas production purpose.By above step, realize air water point adopt, the purpose that a well is dual-purpose.
The casing programme drill bushing parameter of table 1
Although the present invention is described in detail with reference to the foregoing embodiments, for those skilled in the art, its according to
The technical scheme described in foregoing embodiments can so be modified, or which part technical characteristic is equally replaced
Change, within the spirit and principles of the invention, any modification, equivalent substitution and improvements made etc., should be included in the present invention
Protection domain within.
Claims (4)
- A kind of 1. water pumping gas production integration goaf gas extraction well casing programme, it is characterised in that：Including well depth structure division And environment division, wherein well depth structure division drive sleeve pipe including being arranged on the one of the superiors（1）, one drives sleeve pipe（1）Bottom connects Two drive sleeve pipe（2）, two drive sleeve pipe（2）It is arranged on water-bearing layer（4）Depth location, two drive sleeve pipe（2）Screen casing is driven in bottom connection three （3）, three drive screen casing（3）It is arranged on goaf and fissure zone（5）Depth location, three drive screen casing（3）Bottom be arranged on shaft bottom （7）Position；Environment division drives sleeve pipe including being arranged on one（1）, two drive sleeve pipe（2）And three drive screen casing（3）Interior oil pipe（e）, Oil pipe（e）Top is provided with delivery port（a）, oil pipe（e）Bottom is provided with draining pump（f）, oil pipe（e）Bottom is provided with water sucking mouth（g）, one Drive sleeve pipe（1）Top is well head（c）, well head（c）Opening position is provided with oil pipe suspension and sealing device（b）, gas pumping pump（d）With Well head（c）Connection.
- 2. water pumping gas production integration goaf gas extraction well casing programme according to claim 1, it is characterised in that：One Drive sleeve pipe（1）Diameter drive sleeve pipe more than two（2）Diameter.
- 3. water pumping gas production integration goaf gas extraction well casing programme according to claim 2, it is characterised in that：Two Drive sleeve pipe（2）Diameter drive screen casing more than three（3）Diameter.
- 4. a kind of construction method of water pumping gas production integration goaf gas extraction well casing programme as claimed in claim 3, It is characterized in that：Comprise the following steps that, a spudding well uses D311.15mm drill bits, the firm basement rock being drilled under earth's surface unconsolidated formation 10m in layer, to avoid sleeve pipe from sinking, unconsolidated formation caves in, seeps water, then tripping in D273.05mm casing cementings；Two spudding wells use D241.3mm drill bits, bore and are only bored immediately after meeting above goaf crack, are particularly being drilled into coal seam top To slow down drilling speed after plate above 100m, then G.I.H endoscope finds out quantity, the depth in water-bearing layer above fissure zone, then The long stoppers of 0.5m, yellow sand closure are inserted successively upwards from two spudding well bottoms, and the depth that yellow sand is inserted is until bottom one layer aqueous At the 1m of layer lower section, artificial bottom of a well is formed, it is complete then to reach sealing up to earth's surface tripping in D193.7mm casing cementings from artificial bottom of a well The purpose in portion water-bearing layer；Three spudding wells use D171.5mm drill bits, drill through two open lower Yellow sand, stopper after continue, to gob well, to drill successively Fissure zone, caving zone, goaf space, until 15m finishing drillings below seat earth, then from two open in sleeve bottom at 2m up to Bottom hole, tripping in D139.7mm sieve tube completions；It is drilled into below seat earth to carry drilling tool and drill bit to two after 15m and opens in sleeve pipe, respectively at 1 hour, 6 hours, 12 hours Lower probing bottom afterwards, is such as hampered, then continues drifting to shaft bottom from the depth that is hampered, to ensure that the borehole wall is in metastable state, such as well Wall can keep 12 hours stabilizations, then all propose that drilling tools start tripping in D139.7mm sieve tube completions；After completion, according to goaf inner product water and the difference of required displacement, tripping in oil well pump, electric submersible pump or screw rod in hole Pumping arranges water in gob area, and ponding drains into earth's surface after pumping is arranged along oil pipe, gas in goaf and fissure zone, then via screen casing Annular space between eyelet, oil-pipe external wall and internal surface of sleeve pipe, extracted by the negative pressure extraction equipment on ground, reach gas production purpose.
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107905763A (en) * | 2017-12-20 | 2018-04-13 | 中国矿业大学(北京) | A kind of mash gas pumping drilling Stability Maintenance material and installation aiding device and method |
| CN108331560A (en) * | 2018-01-29 | 2018-07-27 | 中煤科工集团重庆研究院有限公司 | A kind of coal bed gas surface well pumping method of minery containing water flooding |
| CN109025912A (en) * | 2018-09-13 | 2018-12-18 | 河南工程学院 | Coal bed gas water drainage gas production device |
| CN109209474A (en) * | 2018-09-27 | 2019-01-15 | 太原理工大学 | A kind of method that dual-lateral well extracts lower coal seam and top more goaf gas and ponding |
| CN109611056A (en) * | 2018-12-18 | 2019-04-12 | 辽宁工程技术大学 | One kind is based on complicated structure band gas drainage solid protrusion-dispelling system and method |
| CN110331932A (en) * | 2019-07-11 | 2019-10-15 | 中煤科工集团重庆研究院有限公司 | Coal bed gas tail pipe well drilling method suitable for coal mine gob/wear goaf |
| CN110656941A (en) * | 2019-10-31 | 2020-01-07 | 中煤科工集团重庆研究院有限公司 | Design method and construction process of man-shaped ground well in coal mining area |
| CN110939408A (en) * | 2018-09-25 | 2020-03-31 | 山西省煤炭地质勘查研究院 | Optimized goaf coalbed methane ground extraction well body structure and well cementation method |
| CN110939407A (en) * | 2018-09-25 | 2020-03-31 | 山西省煤炭地质勘查研究院 | Double-deck overlapping goaf ground drainage well structure and recovery unit |
| CN111021959A (en) * | 2019-12-20 | 2020-04-17 | 山西蓝焰煤层气集团有限责任公司 | Well drilling method for preventing water accumulation in goaf |
| CN111075349A (en) * | 2019-12-20 | 2020-04-28 | 山西晋城无烟煤矿业集团有限责任公司 | Construction method of ground mining empty well suspension type well body structure |
| CN111878156A (en) * | 2020-08-07 | 2020-11-03 | 山西晋城无烟煤矿业集团有限责任公司 | Micro L-shaped long-life anti-damage well body structure of mining well and well drilling method thereof |
| CN112145132A (en) * | 2020-10-12 | 2020-12-29 | 山西晋城无烟煤矿业集团有限责任公司 | Well drilling method for extracting coal bed gas of adjacent closed goaf group |
| CN112145131A (en) * | 2020-10-12 | 2020-12-29 | 山西晋城无烟煤矿业集团有限责任公司 | Method for extracting coal-bed gas well in inclined coal-bed goaf |
| CN114856495A (en) * | 2021-02-04 | 2022-08-05 | 中国石油天然气股份有限公司 | Underground device for testing gas-water output profile of coal bed gas combined production well |
| CN114856494A (en) * | 2021-02-04 | 2022-08-05 | 中国石油天然气股份有限公司 | Gas-water output profile testing method for coal bed gas combined production well |
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| CN107905763A (en) * | 2017-12-20 | 2018-04-13 | 中国矿业大学(北京) | A kind of mash gas pumping drilling Stability Maintenance material and installation aiding device and method |
| CN108331560A (en) * | 2018-01-29 | 2018-07-27 | 中煤科工集团重庆研究院有限公司 | A kind of coal bed gas surface well pumping method of minery containing water flooding |
| CN109025912B (en) * | 2018-09-13 | 2020-10-09 | 河南工程学院 | Coal bed gas drainage and gas production device |
| CN109025912A (en) * | 2018-09-13 | 2018-12-18 | 河南工程学院 | Coal bed gas water drainage gas production device |
| CN110939408A (en) * | 2018-09-25 | 2020-03-31 | 山西省煤炭地质勘查研究院 | Optimized goaf coalbed methane ground extraction well body structure and well cementation method |
| CN110939407A (en) * | 2018-09-25 | 2020-03-31 | 山西省煤炭地质勘查研究院 | Double-deck overlapping goaf ground drainage well structure and recovery unit |
| CN109209474A (en) * | 2018-09-27 | 2019-01-15 | 太原理工大学 | A kind of method that dual-lateral well extracts lower coal seam and top more goaf gas and ponding |
| CN109209474B (en) * | 2018-09-27 | 2020-07-28 | 太原理工大学 | Method for extracting gas and accumulated water from coal seam and upper multi-goaf by double branch well |
| CN109611056A (en) * | 2018-12-18 | 2019-04-12 | 辽宁工程技术大学 | One kind is based on complicated structure band gas drainage solid protrusion-dispelling system and method |
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| CN110331932A (en) * | 2019-07-11 | 2019-10-15 | 中煤科工集团重庆研究院有限公司 | Coal bed gas tail pipe well drilling method suitable for coal mine gob/wear goaf |
| CN110331932B (en) * | 2019-07-11 | 2020-11-24 | 中煤科工集团重庆研究院有限公司 | Coal bed gas tail pipe drilling method suitable for coal mine goaf/through goaf |
| CN110656941A (en) * | 2019-10-31 | 2020-01-07 | 中煤科工集团重庆研究院有限公司 | Design method and construction process of man-shaped ground well in coal mining area |
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| CN111075349A (en) * | 2019-12-20 | 2020-04-28 | 山西晋城无烟煤矿业集团有限责任公司 | Construction method of ground mining empty well suspension type well body structure |
| CN111021959A (en) * | 2019-12-20 | 2020-04-17 | 山西蓝焰煤层气集团有限责任公司 | Well drilling method for preventing water accumulation in goaf |
| CN111075349B (en) * | 2019-12-20 | 2021-08-27 | 山西晋城无烟煤矿业集团有限责任公司 | Construction method of ground mining empty well suspension type well body structure |
| CN111878156A (en) * | 2020-08-07 | 2020-11-03 | 山西晋城无烟煤矿业集团有限责任公司 | Micro L-shaped long-life anti-damage well body structure of mining well and well drilling method thereof |
| CN111878156B (en) * | 2020-08-07 | 2022-03-22 | 山西晋城无烟煤矿业集团有限责任公司 | Well drilling method for micro L-shaped long-life anti-damage well body structure of mining well |
| CN112145132A (en) * | 2020-10-12 | 2020-12-29 | 山西晋城无烟煤矿业集团有限责任公司 | Well drilling method for extracting coal bed gas of adjacent closed goaf group |
| CN112145131A (en) * | 2020-10-12 | 2020-12-29 | 山西晋城无烟煤矿业集团有限责任公司 | Method for extracting coal-bed gas well in inclined coal-bed goaf |
| CN114856495A (en) * | 2021-02-04 | 2022-08-05 | 中国石油天然气股份有限公司 | Underground device for testing gas-water output profile of coal bed gas combined production well |
| CN114856494A (en) * | 2021-02-04 | 2022-08-05 | 中国石油天然气股份有限公司 | Gas-water output profile testing method for coal bed gas combined production well |
| CN114856495B (en) * | 2021-02-04 | 2023-12-26 | 中国石油天然气股份有限公司 | Underground device for testing gas water production profile of coal bed gas combined well |
| CN114856494B (en) * | 2021-02-04 | 2024-03-26 | 中国石油天然气股份有限公司 | Method for testing gas and water production profile of coal bed gas combined well |
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