CN104895531A - Single thick coal seam ground mining well extraction process - Google Patents
Single thick coal seam ground mining well extraction process Download PDFInfo
- Publication number
- CN104895531A CN104895531A CN201510217241.6A CN201510217241A CN104895531A CN 104895531 A CN104895531 A CN 104895531A CN 201510217241 A CN201510217241 A CN 201510217241A CN 104895531 A CN104895531 A CN 104895531A
- Authority
- CN
- China
- Prior art keywords
- extraction
- well
- ground
- coal
- coal seam
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The invention belongs to the technical field of coal bed gas extraction and particularly relates to a single thick coal seam ground mining well extraction process which is capable of performing scale and high-benefit extraction on single coal seams in condition of high ground stress and low permeability. A tri-size drilling process is used, a local well cementation mode is used for relieving damage to bushings by stratum moving, and damage of ground extraction well process structure is prevented by adding a hanger. By extraction experiment well extraction effect analysis and technological and economic feasibility evaluation, the ground extraction well output effect and the cost in condition of single thick coal seam extraction are offset basically, and certain reference and guide effects are provided for future ground coal bed gas extraction well process design and construction of other mines.
Description
Technical field
The invention belongs to Coal-seam Gas Recovery Technologies field, be specifically related to a kind of Single thick coal seam ground and adopt well extraction technique.
Background technology
For the mining area containing the important minable coal seam of Permo-Carboniferous system and coal bed gas resource, its main mining coal seam is meta anthracite, has that simple structure, seam hardness are high, gas bearing capacity high.Bury by coal that the depth, coal are thick, technology complexity, exploitation economy etc. affect, preferentially exploited Shanxi Formation of Permian No. 3 coal seams (organizing coal under being commonly called as the Permian System).Because geological tectonic conditions is better, fail to cause a large amount of loss of coal-formed gas (being mainly methane gas) Formation period generation gas, so ton coal coal bed gas (coal mine gas) content is high.According to safety in production requirement, before carrying out coal mining, need to take ground coal bed gas well and down-hole extraction borehole extraction coal bed gas (coal mine gas), after reducing ton coal coal bed gas (coal mine gas) content, can coal mining be carried out.
In current coal mining process, " being caving formula broadwall technique " is main coal winning technology, and adopt " three enter twice inclined Y " type ventilation system of " many tunnels, big cross section, Wind Volume, separate ventilation " feature, highly gassy mine carries out " the laddering pre-mash gas extraction pattern in region ", establish this coal seam, goaf two and overlap gas drainage system, set up underground mobile extraction pumping plant for local ground gas such as upper corners.
But for this type of mining area, after adopting conventional ground coal bed gas well well-completing process, test with ground negative-pressure vacuum pump extraction and G.I.H sniffer, move destruction to casing programme by coal mining rock carry out preliminary field trial and find after analyzing, coal bed gas well casing programme is subject to coal mining rock and moves destruction, due to maximum in the interface mantlerock occurred level displacement of weathered zone and basement rock, so casing programme can be caused to occur in this position thoroughly to destroy, simultaneously, reached the limit values by the negative pressure value of negative pressure on ground vacuum pump, after also reflects casing programme destruction, without crack effective communication.Therefore, because the band that subsides by the fragmentation Permian System being organized coal mining formation affects, adopt above-mentioned conventional exploitation method to be difficult to realize the exploitation that coal bed gas has certain scale and high benefit under high-ground stress, low-permeability condition, effectively cannot realize the extraction of progress of coal mining neutralization being adopted to the gas of rear mined-out region.
Meanwhile, because the geostatic stress value in China's coal-mine district mainly concentrates on 8 ~ 17MPa, maximumly reach 22.7MPa (big city area), adopt this conventional exploitation method, even in basin, about its yield also only has individual well average 3000 sides/daily output; And the Blackwarrior basin geostatic stress value 1 ~ 6MPa of the U.S., so under equal well-completing process condition, the recovery ratio of China's ground coal bed gas exploitation will well below the output of the well of the U.S. average 6000 ~ 8000 sides/day.As can be seen here, conventional exploitation method is adopted to be difficult to realize the exploitation that coal bed gas has certain scale and high benefit under high-ground stress, low-permeability condition in China.
Summary of the invention
The present invention, in order to carry out the exploitation of scale and high benefit to the single coal bed under high-ground stress, low-permeability condition, provides a kind of Single thick coal seam ground and adopts well extraction technique.
The present invention adopts following technical scheme:
Well extraction technique is adopted on a kind of Single thick coal seam ground, and adopt three to open drilling process, its concrete technology step is:
One opens: adopt conventional bit boring, and the well cementation of setting of casing local, above returns cement to ground;
Two open: adopt drill bit conventional mud to creep into goaf seat earth, full well without hindrance rear under enter two and drive sleeve pipe, two open sleeve bottom installs hanger, well cementation sealing two opens mouth at the bottom of sleeve pipe, Hou Ning;
Three open: continue to adopt drill bit conventional mud to creep into, drill guide shoe, are drilled into roof place and stop boring, by entering antipriming pipe completion under hanger.
Described two upper surfaces of driving sleeve pipe exceed ground surface.
The present invention has following beneficial effect:
1, the present invention effectively alleviates because strata deformation causes the problem of Casing Failure by the mode of local well cementation;
2, effectively prevent the destruction of ground being adopted to well process structure further by setting up hanger device;
3, based on project net present value (NPV) evaluation assessment, carried out following economic viability evaluation, shown that direct output and cost offset substantially, ground coal bed gas has been carried out to other mining areas from now on and adopts well technological design and construction has certain reference and directive function:
(1) construction investment estimation
Cost: the direct shaft building cost that coal bed gas well is adopted on 1 mouthful of ground is 1,500,000 yuan, and extraction cost is 500,000 yuan, and collecting the defeated cost that utilizes is 400,000 yuan, 1 annual operating cost 200000 yuan.Cost is added up to be 2,600,000 yuan.
(2) project net present value (NPV) is evaluated
Net present value (NPV)=
In formula: n---the project time limit;
Ik---the cash inflow in kth year;
Ok---the cash flow of K;
I---capital cost.
According to Present Domestic capital cost 10%, integration project output situation and sale present situation: average daily output pure amount 6000 cubic metres, accumulative extraction 1 year, accumulative extraction scale more than 200 all places.Calculate by 1.2 yuan/square upstream selling cost, what comprise country amounts to the subsidy of 0.25 yuan/side, accumulative year output volume=200 × (1.2+0.25)=2,900,000 yuan; Net present value (NPV)=290 × 0.9091-260=3.639(ten thousand yuan); Draw, output and cost offset substantially.
Accompanying drawing explanation
Fig. 1 is the casing programme schematic diagram in extraction activities of the present invention;
In figure: 1-sleeve pipe, 2-bis-open sleeve pipe, 3-cement, 4-hanger, 5-antipriming pipe, 6-coal seam, 7-roof, 8-seat earth, A-mono-perforate, B-bis-perforate, C-tri-perforate.
Detailed description of the invention
In single coal bed recovery process, because casing programme, at the interface place of weathered zone and basement rock, thorough destruction easily occurs, the present invention have employed local well cementation mode as shown in Figure 1 when three open drilling process, and has set up hanger device, and its concrete technology step is as follows:
One perforate A: adopt the perforate of φ 444.5mm drill bit, the sleeve pipe 1 local well cementation of lower φ 377.7mm, above returns cement to ground.Utilize local well cementation mode can alleviate because strata deformation causes the destruction of sleeve pipe.
Two perforate B: adopt φ 311.1mm drill bit to carry out conventional mud and creep into, creep into the goaf seat earth 8 to 60m place, full well without hindrance rear under enter φ 244.5mm bis-and drive sleeve pipe 2, two open bottom sleeve pipe 2 and install hanger 4, well cementation also sealing two opens sleeve pipe 2 end mouth, Hou Ning.Wherein, two upper surfaces of driving sleeve pipe 2 should exceed ground surface, ensure that it returning the foreign material such as cement can not enter impact construction in sleeve pipe; Open by setting up hanger device to prevent three the structure that well is adopted on sleeve pipe sinking rear destruction ground simultaneously.
Three perforate C: adopt φ 215.9mm drill bit conventional mud to creep into, drill guide shoe, stop to bore after being drilled into roof place, by 4 entering φ 139.7mm antipriming pipe 5 completion under hanger.
Industrial analysis of the present invention is:
Theoretical according to mine strata movement, coal seam in recovery process, before this adjoining rock be caving, mobile, producing crack, is then the gas release in working seam and pressure released seam and desorb.Move and seepage characteristic because gas has capture, come from large-area gas pressure relief and be pooled to crack along crack passage and reach full growth district, be namely pooled in gas drainage, in gas drainage, form gas stockpile library.By extraction borehole and roadway layout in gas drainage, desirable extracting result can be obtained, thus avoid goaf gas to pour in excavation.
The distortion that layered combination feature because of the movement of Single thick coal seam Overlying Strata In A Face determines ground drilling presents different variant: stretching undergauge mainly occurs the internal drilling of single rock stratum, the main generation of interface place boring in single combination rock stratum is sheared disrumpent feelings, and two combination interface place, rock stratum borings are mainly drawn and cut comprehensive deformation.And casing programme as shown in Figure 1 can effectively resist its deformation failure.
In technological design design, determine by following three aspect principles:
(1) boring is not subject to Mining failure: for the minery boring of constructing in advance, i.e. the ground extraction boring of just construction before the back production of coal seam should be arranged in by the minimum region of following Mining failure, such as: the positions such as coal column.
(2) pitch-row is reasonable: due to the cranny development of coal rock layer in Affected areas by mining, flow conductivity improves greatly, and single hole control area is comparatively large, and less boring just can meet extraction needs, therefore generally considers that pitch-row is greater than 300m.
(3) ground environment is favourable: should ensure that ground has enough spaces to implement ground surface works, not have surface structures, water body etc.; The road traffic of construction needs, power supply water supply conditions can be met.
Component for making specified otherwise in the present invention is prior art.
Claims (2)
1. a well extraction technique is adopted on Single thick coal seam ground, adopts three to open drilling process, it is characterized in that its concrete technology step is:
One opens: adopt conventional bit boring, and the well cementation of setting of casing (1) local, above returns cement to ground;
Two open: adopt drill bit conventional mud to creep into goaf seat earth (8), full well without hindrance rear under enter two and drive sleeve pipe (2), two open sleeve pipe (2) bottom installs hanger (4), well cementation sealing two opens sleeve pipe (2) end mouth, Hou Ning;
Three open: continue to adopt drill bit conventional mud to creep into, drill guide shoe, are drilled into roof (7) place and stop boring, by entering antipriming pipe (5) completion under hanger (4).
2. well extraction technique is adopted on Single thick coal seam ground according to claim 1, it is characterized in that: described two upper surfaces of driving sleeve pipe (2) exceed ground surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510217241.6A CN104895531A (en) | 2015-04-30 | 2015-04-30 | Single thick coal seam ground mining well extraction process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510217241.6A CN104895531A (en) | 2015-04-30 | 2015-04-30 | Single thick coal seam ground mining well extraction process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104895531A true CN104895531A (en) | 2015-09-09 |
Family
ID=54028447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510217241.6A Pending CN104895531A (en) | 2015-04-30 | 2015-04-30 | Single thick coal seam ground mining well extraction process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104895531A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107366505A (en) * | 2017-05-27 | 2017-11-21 | 中核通辽铀业有限责任公司 | A kind of ground-dipping uranium extraction Novel drilling construction method |
| CN107401393A (en) * | 2017-07-31 | 2017-11-28 | 山西晋城无烟煤矿业集团有限责任公司 | Water pumping gas production integration goaf gas extraction well casing programme and its construction method |
| CN107503789A (en) * | 2017-07-31 | 2017-12-22 | 山西晋城无烟煤矿业集团有限责任公司 | Low gaseous mine high-productivity faces gas ground extraction method |
| CN107575262A (en) * | 2017-07-31 | 2018-01-12 | 山西晋城无烟煤矿业集团有限责任公司 | A kind of quick extraction is adopted distressed zone and underlied the method for coal-bed gas |
| 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 |
| CN109403923A (en) * | 2018-09-28 | 2019-03-01 | 山西晋城无烟煤矿业集团有限责任公司 | A kind of coal bed gas T-type wears the short horizontal well construction method in goaf |
| CN111236874A (en) * | 2020-03-31 | 2020-06-05 | 应急管理部信息研究院 | Method for cutting ground coal bed gas well casing pipe underground |
| CN110043309B (en) * | 2019-05-29 | 2020-07-28 | 中国煤炭地质总局勘查研究总院 | Arrangement method for closing gas extraction well of coal mine and well body installation method |
| CN114233368A (en) * | 2021-12-28 | 2022-03-25 | 山西晋煤集团技术研究院有限责任公司 | Method for treating harmful gas downward discharge of overlying goaf |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101649740A (en) * | 2009-09-03 | 2010-02-17 | 周福宝 | Ground bored well body structure for gas extraction |
| CN103233694A (en) * | 2013-04-17 | 2013-08-07 | 中煤科工集团重庆研究院 | Method for descending and suspending production casing for mining area ground coal-bed gas well and casing device |
| CN203201486U (en) * | 2013-04-17 | 2013-09-18 | 中煤科工集团重庆研究院 | Casing pipe device for mining area coal-bed gas well on ground |
| CN103867119A (en) * | 2014-02-27 | 2014-06-18 | 中国石油天然气股份有限公司 | Coal reservoir well completion renovation method |
| CN203796238U (en) * | 2014-05-04 | 2014-08-27 | 中国矿业大学 | Novel pressure relief coal bed gas well device |
| CN104405281A (en) * | 2014-10-20 | 2015-03-11 | 山西蓝焰煤层气集团有限责任公司 | Casing drilling technique for over-goaf |
-
2015
- 2015-04-30 CN CN201510217241.6A patent/CN104895531A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101649740A (en) * | 2009-09-03 | 2010-02-17 | 周福宝 | Ground bored well body structure for gas extraction |
| CN103233694A (en) * | 2013-04-17 | 2013-08-07 | 中煤科工集团重庆研究院 | Method for descending and suspending production casing for mining area ground coal-bed gas well and casing device |
| CN203201486U (en) * | 2013-04-17 | 2013-09-18 | 中煤科工集团重庆研究院 | Casing pipe device for mining area coal-bed gas well on ground |
| CN103867119A (en) * | 2014-02-27 | 2014-06-18 | 中国石油天然气股份有限公司 | Coal reservoir well completion renovation method |
| CN203796238U (en) * | 2014-05-04 | 2014-08-27 | 中国矿业大学 | Novel pressure relief coal bed gas well device |
| CN104405281A (en) * | 2014-10-20 | 2015-03-11 | 山西蓝焰煤层气集团有限责任公司 | Casing drilling technique for over-goaf |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107366505A (en) * | 2017-05-27 | 2017-11-21 | 中核通辽铀业有限责任公司 | A kind of ground-dipping uranium extraction Novel drilling construction method |
| CN107401393A (en) * | 2017-07-31 | 2017-11-28 | 山西晋城无烟煤矿业集团有限责任公司 | Water pumping gas production integration goaf gas extraction well casing programme and its construction method |
| CN107503789A (en) * | 2017-07-31 | 2017-12-22 | 山西晋城无烟煤矿业集团有限责任公司 | Low gaseous mine high-productivity faces gas ground extraction method |
| CN107575262A (en) * | 2017-07-31 | 2018-01-12 | 山西晋城无烟煤矿业集团有限责任公司 | A kind of quick extraction is adopted distressed zone and underlied the method for coal-bed gas |
| CN107503789B (en) * | 2017-07-31 | 2019-07-02 | 山西晋城无烟煤矿业集团有限责任公司 | Low gaseous mine high-productivity faces gas ground extraction method |
| CN107401393B (en) * | 2017-07-31 | 2023-07-25 | 山西晋城无烟煤矿业集团有限责任公司 | Drainage and gas production integrated goaf gas extraction well body structure and construction method thereof |
| 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 |
| CN109403923A (en) * | 2018-09-28 | 2019-03-01 | 山西晋城无烟煤矿业集团有限责任公司 | A kind of coal bed gas T-type wears the short horizontal well construction method in goaf |
| CN110043309B (en) * | 2019-05-29 | 2020-07-28 | 中国煤炭地质总局勘查研究总院 | Arrangement method for closing gas extraction well of coal mine and well body installation method |
| CN111236874A (en) * | 2020-03-31 | 2020-06-05 | 应急管理部信息研究院 | Method for cutting ground coal bed gas well casing pipe underground |
| CN114233368A (en) * | 2021-12-28 | 2022-03-25 | 山西晋煤集团技术研究院有限责任公司 | Method for treating harmful gas downward discharge of overlying goaf |
| CN114233368B (en) * | 2021-12-28 | 2023-10-13 | 山西晋煤集团技术研究院有限责任公司 | Method for treating harmful gas leakage in overlying goaf |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104895531A (en) | Single thick coal seam ground mining well extraction process | |
| CN111042791B (en) | Combined coal and coal bed gas co-production method for upper and lower wells of low-permeability coal bed group | |
| CN102080526B (en) | Method for extracting gas from bedding level fractured well of ground coal seam roof | |
| CN101915083B (en) | Method for extracting coalbed gases from coal mines by upper and lower combination | |
| CN100560937C (en) | A kind of thin basic rock shallow buried coal seam longwall face water retaining exploitation method | |
| CN102392677A (en) | Permeability improvement technology for coal bed gas reservoir cap by using three-dimensional fracture network modification | |
| CN101915072B (en) | Method for extracting coal bed gas in stable mining region by ground well drilling | |
| CN112593936B (en) | Advanced comprehensive control method for multi-disaster area of deep mine | |
| CN207048739U (en) | A kind of low gaseous mine gas ground extraction technology drilled well bore structure | |
| CN102817603B (en) | A kind of method being communicated with ground and underground coal seam gas | |
| CN104694746A (en) | Ion-adsorption-type rare earth in-situ leaching method and leaching system thereof | |
| CN102799955B (en) | Water bursting coefficient is less than 0.06MPa/m district Water Inrush and evaluates three figure methods | |
| CN109441450A (en) | A kind of double resource pit mining modes of lower coal water of overlying strata hydrogeologic condition disturbance | |
| CN103953386A (en) | Upstream-blocking and downstream-seepage method for extracting gas in mining area | |
| CN104975868A (en) | Top plate high-position boring large-diameter long-drill-hole gas extraction method based on directional drilling | |
| CN107620581B (en) | Construction method of one-well dual-purpose coal mine shaft inspection hole | |
| CN102518412A (en) | Method for mining coal and gas by hydraulic jet grouting washout | |
| CN102493831A (en) | Method for extracting coal seam gas through ground fracturing and underground horizontal drill holes | |
| CN102777185A (en) | Inclined well shaft construction technology | |
| CN112879011A (en) | Method for controlling height of water guide crack zone by hard overburden rock pre-cracking weakening under aquifer | |
| CN114294046B (en) | Coal mine area full-coverage underground three-dimensional extraction method | |
| CN114837555A (en) | Feather-shaped multifunctional directional drilling hole arrangement method | |
| Han et al. | Exploitation technology of pressure relief coalbed methane in vertical surface wells in the Huainan coal mining area | |
| CN103362541A (en) | Method for locally improving coal seam air permeability in coal seam with high gas and low air permeability | |
| CN103291307B (en) | A kind of rich water rockhole Dewatering by leading level method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150909 |
|
| RJ01 | Rejection of invention patent application after publication |