CN106194147A - The method that in a kind of underground coal gasification(UCG) exploitation, straight well horizontal well combines igniting - Google Patents
The method that in a kind of underground coal gasification(UCG) exploitation, straight well horizontal well combines igniting Download PDFInfo
- Publication number
- CN106194147A CN106194147A CN201610615786.7A CN201610615786A CN106194147A CN 106194147 A CN106194147 A CN 106194147A CN 201610615786 A CN201610615786 A CN 201610615786A CN 106194147 A CN106194147 A CN 106194147A
- Authority
- CN
- China
- Prior art keywords
- igniting
- horizontal well
- coal seam
- well
- gas
- 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.)
- Granted
Links
Classifications
-
- 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
- E21B43/295—Gasification of minerals, e.g. for producing mixtures of combustible gases
Abstract
The present invention relates to the method that in a kind of underground coal gasification(UCG) exploitation, straight well horizontal well combines igniting, little due to the initial stage underground space for current general point ignition method, exist and cause igniting difficulty, the duration of ignition problem such as length, the present invention carries out perforation and fracturing work to coal seam, and adds mixing combustion adjuvant and oxygen-enriched pilot gas, adds and is cracked into power, can effectively light a fire, save time, human cost.
Description
Technical field
The present invention relates to the method that in a kind of underground coal gasification(UCG) exploitation, straight well horizontal well combines igniting, belong to the coal ground therapeutic method to keep the adverse QI flowing downwards
Change field.
Background technology
Underground coal gasification(UCG) (UCG) is underground to be composed the coal deposited combustion gasification generation synthesis gas in coal seam be transported to ground
Face, is particularly well-suited to conventional method as the energy or industrial chemicals and can not adopt or uneconomic coal seam, and the secondary in colliery or
Repeatedly second mining.Output gas may be processed, and is carried by pipeline, it is possible to directly uses coal gas generating or chemical industry synthesis.Coal ground
Gasified is one and merges the multidisciplinary comprehensive energy production technology being integrated, and relates to geology, hydrology, drilling well skill
Art, ignition control a series of technology such as technology, product gas process and utilization technology, ecological environmental protection, and its complexity is remote
Gasify in super ground.At present general point ignition method is little due to the initial stage underground space, causes igniting difficulty, the duration of ignition problem such as length.
Summary of the invention
In order to solve the problems referred to above that prior art exists, it is an object of the invention to provide a kind of underground coal gasification(UCG) exploitation
The method that middle straight well horizontal well combines igniting, uses straight well horizontal well to combine the mode of igniting, can realize underground coal gasification(UCG)
Efficiently igniting.
The present invention relates to the method that in a kind of underground coal gasification(UCG) exploitation, straight well horizontal well combines igniting, including following step
Rapid: step 1. carries out coal exploration, drilling straight-hole, horizontal well, and horizontal well is at bottom 50-80cm；Step 2. is bored with expanding cylinder
Head gets out a diameter of 80-90cm, the hole of a length of 2-4m at anticipated igniting, and after reaming, macroscopic void is apart from lower rock stratum 20cm-
50cm；Pit shaft is connected by perforating gun mode perforation with coal seam；Step 3. carries out high-pressure hydraulic pressure break, pressure break scope to coal seam
For 10-15m；Step 4. injects the mixing being made up of ammonium nitrate and potassium chloride of weight ratio 1: 2-1: 4 by straight well in coal seam
Thing 1-2 ton, reinjects the air of 15000-25000 side, injects 0.5-1 ton oxalic acid afterwards；Step 5. step 4 passes through water after completing
Horizontal well injects oxygen-enriched pilot gas in coal seam, is lighted a fire by galvanic couple balance underground coal igniter, and constantly injects
Combustion-supporting gas, oxygen content in gas recovery well monitoring extraction gas component, so that it is determined that igniting is the most successful.
In step 2 pit shaft and coal seam be connected by perforating gun mode perforation, concrete steps include: application CUMULATIVE BLASTING
Principle, utilizes cable or tubing string are transported to down-hole and are directed at purpose by the special lined-cavity charge of Oil/gas Well of assembling good seal
Layer, takes electromagnetic detonators to light a fire, and the mode of caber or pressurization Instantaneous detonation initiator, primacord and cumulative sequentially launch
Hole bullet.Perforation diameter 10～15mm；The short axle of eyelet geometry is 0.6-0.8 with the ratio of major axis；Aperture track must be along sleeve pipe table
Surface helix is distributed, and can only be up to an eyelet at arbitrary cross section；Perforation density is 15～25 holes/m.Eyelet to be worn as far as possible
Injury district, coal seam thoroughly, enters without hindering district.
Step 3 uses prepad fluid slippery water commonly used in the art, load fluid, clean fracturing fluid carry out pressure break to execute
Work.In order to fully make seam and strengthen the prop-carrying capacity of liquid, construction uses huge discharge mode to carry out pressure break, designs discharge capacity 7.0-
10.0m3/ min, wherein oil pipe injects discharge capacity 2.6～2.7m3/ min, sleeve pipe injects discharge capacity 4.5-7.5m3/min.In order to reduce hole
Bending friction in eye and crack, each section of pad stage adds 2 Proppant Slugs；Construction adds sand and uses 20～40 mesh quartz
Sand, to improve proppant supporting efficiency, improves fracture condudtiviy.
In step 5, the composition of oxygen-enriched pilot gas is made up of 60-80% oxygen and 20-40% nitrogen by mass percentage,
Combustion-supporting gas can be methane or ethane.
Compared with prior art, in the underground coal gasification(UCG) exploitation of the present invention, straight well horizontal well is combined the method for igniting and is had
Following beneficial effect:
1. use and expand cylinder drill bit, cavity size can be adjusted according to different coal, provide convenient bar for follow-up perforation, pressure break
Part, the more conventional drilling well of this method is the most flexible, efficiently.
2. can expand combustion-supporting gas after pair coal seam carries out perforation, fracturing work and deposit volume, increase ignition success rate.
3. in gas injection well, add mixing combustion adjuvant (ammonium nitrate, potassium chloride, oxalic acid), and use oxygen-enriched pilot gas to inject
Mode, adds and is cracked into power, can effectively light a fire, and has saved time, human cost.
4., by oxygen in tail gas is monitored, it is known that burning progress, efficiency, more accurately learn underground combustion situation.
5. horizontal well combines with straight well, has single horizontal well concurrently and links up the spy of coal seam hugger and straight well " point " shape extraction of gas
Point, has horizontal well and two well heads of straight well, it is possible to achieve draining and gas production are carried out simultaneously.
Accompanying drawing explanation
Fig. 1 ream operation schematic diagram.
1. horizontal well；2. straight well；3. nitrogen separation device；4. oxygen rich gas；5. pressure break scope；6. ream operation scope；
7. combustion adjuvant；8. coal seam
Detailed description of the invention
Below by embodiment, technical scheme is described in further detail.
Embodiment 1
The method that in a kind of underground coal gasification(UCG) exploitation, straight well horizontal well combines igniting, comprises the following steps: step 1. is entered
Row coal exploration, drilling straight-hole (2), horizontal well (1), horizontal well (1) is at the 65cm of coal seam (8) bottom；Step 2. is with expanding cylinder drill bit
Getting out a diameter of 85cm, the hole of a length of 2m at anticipated igniting, after reaming, macroscopic void is apart from lower rock stratum 25cm；Pit shaft with
Coal seam (8) be connected by perforating gun mode perforation；Step 3. carries out high-pressure hydraulic pressure break to coal seam (8), and pressure break scope is
12m；Step 4. injects the mixture 1 being made up of ammonium nitrate and potassium chloride of weight ratio 1: 2 in coal seam (8) by straight well (2)
Ton, reinjects the air of 17000 sides, injects 0.5 ton of oxalic acid afterwards；Step 5. step 4 passes through horizontal well (1) to coal seam after completing
(8) inject oxygen-enriched pilot gas (4) in, lighted a fire by galvanic couple balance underground coal igniter, and constantly inject methane
Gas, oxygen content in gas recovery well monitoring extraction gas component, so that it is determined that igniting is the most successful.Oxygen-enriched pilot gas (4)
Composition be made up of 80% oxygen and 20% nitrogen by mass percentage.
Embodiment 2
The method that in a kind of underground coal gasification(UCG) exploitation, straight well horizontal well combines igniting, comprises the following steps: step 1. is entered
Row coal exploration, drilling straight-hole (2), horizontal well (1), horizontal well (1) is at the 55cm of coal seam (8) bottom；Step 2. is with expanding cylinder drill bit
Getting out a diameter of 80cm, the hole of a length of 2.5m at anticipated igniting, after reaming, macroscopic void is apart from lower rock stratum 22cm；Pit shaft
With coal seam (8) be connected by perforating gun mode perforation；Step 3. carries out high-pressure hydraulic pressure break to coal seam (8), and pressure break scope is
11m；Step 4. injects the mixture being made up of ammonium nitrate and potassium chloride of weight ratio 1: 3 in coal seam (8) by straight well (2)
1.5 tons, reinject the air of 18000 sides, inject 0.6 ton of oxalic acid afterwards；Step 5. step 4 complete after by horizontal well (1) to
Coal seam (8) is injected oxygen-enriched pilot gas (4), is lighted a fire by galvanic couple balance underground coal igniter, and constantly inject
Methane gas, oxygen content in gas recovery well monitoring extraction gas component, so that it is determined that igniting is the most successful.Oxygen-enriched pilot gas
(4) composition is made up of 70% oxygen and 30% nitrogen by mass percentage.
Embodiment 3
The method that in a kind of underground coal gasification(UCG) exploitation, straight well horizontal well combines igniting, comprises the following steps: step 1. is entered
Row coal exploration, drilling straight-hole (2), horizontal well (1), horizontal well (1) is at the 70cm of coal seam (8) bottom；Step 2. is with expanding cylinder drill bit
Getting out a diameter of 85cm, the hole of a length of 3m at anticipated igniting, after reaming, macroscopic void is apart from lower rock stratum 30cm；Pit shaft with
Coal seam (8) be connected by perforating gun mode perforation；Step 3. carries out high-pressure hydraulic pressure break to coal seam (8), and pressure break scope is
13m；Step 4. injects the mixture 2 being made up of ammonium nitrate and potassium chloride of weight ratio 1: 4 in coal seam (8) by straight well (2)
Ton, reinjects the air of 20000 sides, injects 0.8 ton of oxalic acid afterwards；Step 5. step 4 passes through horizontal well (1) to coal seam after completing
(8) inject oxygen-enriched pilot gas (4) in, lighted a fire by galvanic couple balance underground coal igniter, and constantly inject methane
Gas, oxygen content in gas recovery well monitoring extraction gas component, so that it is determined that igniting is the most successful.Oxygen-enriched pilot gas (4)
Composition be made up of 70% oxygen and 30% nitrogen by mass percentage.
Claims (6)
1. the method that in underground coal gasification(UCG) exploitation, straight well horizontal well combines igniting, comprises the following steps:
Step 1. carries out coal exploration, drilling straight-hole (2), horizontal well (1), and horizontal well (1) is at the 50-80cm of coal seam (8) bottom；
Step 2. gets out a diameter of 80-90cm, the hole of a length of 2-4m, after reaming, macropore with expanding cylinder drill bit at anticipated igniting
Hole is apart from lower rock stratum 20cm-50cm；Pit shaft is connected by perforating gun mode perforation with coal seam (8)；
Step 3. carries out high-pressure hydraulic pressure break to coal seam (8), and pressure break scope is 10-15m；
Step 4. injects the mixing being made up of ammonium nitrate and potassium chloride of weight ratio 1: 2-1: 4 in coal seam (8) by straight well (2)
Thing 1-2 ton, reinjects the air of 15000-25000 side, injects 0.5-1 ton oxalic acid afterwards；
Step 5. step 4 injects oxygen-enriched pilot gas (4) by horizontal well (1) after completing in coal seam (8), is balanced by galvanic couple
Underground coal igniter is lighted a fire, and constantly injects combustion-supporting gas, and in gas recovery well monitoring extraction gas component, oxygen contains
Amount, so that it is determined that igniting is the most successful.
Ignition method the most according to claim 1, it is characterised in that the perforation diameter of described employing perforating gun mode perforation
It is 10～15mm；Perforation density is 15～25 holes/m.
Ignition method the most according to claim 1, it is characterised in that designing discharge capacity during described high-pressure hydraulic pressing crack construction is
7.0-10.0m3/ min, wherein, oil pipe injects discharge capacity 2.6～2.7m3/ min, sleeve pipe injects discharge capacity 4.5-7.5m3/min。
Ignition method the most according to claim 1, it is characterised in that during described high-pressure hydraulic pressing crack construction, construction adds sand and adopts
With 20～40 mesh quartz sands.
5. according to the ignition method described in Claims 1-4 any claim, it is characterised in that described oxygen-enriched pilot gas
(4) composition is made up of 60-80% oxygen and 20-40% nitrogen by mass percentage.
Ignition method the most according to claim 5, it is characterised in that described combustion-supporting gas is methane or ethane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610615786.7A CN106194147B (en) | 2016-08-01 | 2016-08-01 | The method of straight well horizontal well joint igniting in a kind of underground coal gasification(UCG) exploitation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610615786.7A CN106194147B (en) | 2016-08-01 | 2016-08-01 | The method of straight well horizontal well joint igniting in a kind of underground coal gasification(UCG) exploitation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106194147A true CN106194147A (en) | 2016-12-07 |
| CN106194147B CN106194147B (en) | 2018-11-02 |
Family
ID=57497601
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610615786.7A Active CN106194147B (en) | 2016-08-01 | 2016-08-01 | The method of straight well horizontal well joint igniting in a kind of underground coal gasification(UCG) exploitation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106194147B (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107939370A (en) * | 2017-12-11 | 2018-04-20 | 山东科技大学 | A kind of strip-type underground coal gasification system and production method |
| CN108952719A (en) * | 2018-07-09 | 2018-12-07 | 山东省煤炭技术服务有限公司 | Coal seam gasification second mining loses the method for coal under the conditions of a kind of longwall top coal caving |
| CN109138952A (en) * | 2018-10-29 | 2019-01-04 | 邓晓亮 | A kind of system and method for overcritical underground coal gasification(UCG) output power generation |
| CN110469306A (en) * | 2019-08-05 | 2019-11-19 | 邓惠荣 | Coal seam oil reservoir underground detonation direction and location crack gas injection produces gas method |
| CN110578508A (en) * | 2019-08-05 | 2019-12-17 | 邓惠荣 | Horizontal well one-well multi-mining combined coal bed gas mining and coal gasification method |
| CN110939424A (en) * | 2019-11-27 | 2020-03-31 | 西安物华巨能爆破器材有限责任公司 | Well-free underground coal gasification ignition method |
| CN111963137A (en) * | 2019-05-20 | 2020-11-20 | 中国石油天然气股份有限公司 | Underground gasification method for huge thick coal seam |
| CN114876438A (en) * | 2022-05-08 | 2022-08-09 | 太原理工大学 | Coal mining method for in-situ hydrogen production of filling coal |
| CN117684918A (en) * | 2024-02-04 | 2024-03-12 | 中国矿业大学 | Method and device for extracting gas by utilizing coal seam waste heat in sectional advancing type heat injection mode |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101864940A (en) * | 2010-03-23 | 2010-10-20 | 邓惠荣 | Underground coal gasification poly-generation closed operation technology |
| CN101864942A (en) * | 2010-03-23 | 2010-10-20 | 邓惠荣 | Remote automatic control technology of oxygen-enriched autogenous ignition and electric ignition in vertical well and horizontal well |
| CN201802362U (en) * | 2010-08-02 | 2011-04-20 | 新奥科技发展有限公司 | Underground gasification passage through device |
| CN102477857A (en) * | 2010-11-30 | 2012-05-30 | 新奥气化采煤有限公司 | Passage formation method for underground coal gasification |
| CN102913221A (en) * | 2012-11-05 | 2013-02-06 | 河南理工大学 | Volume transformation process of low permeability reservoir |
| CN103603643A (en) * | 2013-11-26 | 2014-02-26 | 中国石油集团长城钻探工程有限公司 | Coal bed gas U-shaped well staged fracturing exploitation technology |
| CN103867179A (en) * | 2012-12-11 | 2014-06-18 | 中国石油化工股份有限公司 | Hydraulic jet fracturing method for U-shaped well |
| US20150247385A1 (en) * | 2012-09-21 | 2015-09-03 | ENN Coal Gasification Mining Co., Ltd. | Method for joint-mining of coalbed gas and coal |
-
2016
- 2016-08-01 CN CN201610615786.7A patent/CN106194147B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101864940A (en) * | 2010-03-23 | 2010-10-20 | 邓惠荣 | Underground coal gasification poly-generation closed operation technology |
| CN101864942A (en) * | 2010-03-23 | 2010-10-20 | 邓惠荣 | Remote automatic control technology of oxygen-enriched autogenous ignition and electric ignition in vertical well and horizontal well |
| CN201802362U (en) * | 2010-08-02 | 2011-04-20 | 新奥科技发展有限公司 | Underground gasification passage through device |
| CN102477857A (en) * | 2010-11-30 | 2012-05-30 | 新奥气化采煤有限公司 | Passage formation method for underground coal gasification |
| US20150247385A1 (en) * | 2012-09-21 | 2015-09-03 | ENN Coal Gasification Mining Co., Ltd. | Method for joint-mining of coalbed gas and coal |
| CN102913221A (en) * | 2012-11-05 | 2013-02-06 | 河南理工大学 | Volume transformation process of low permeability reservoir |
| CN103867179A (en) * | 2012-12-11 | 2014-06-18 | 中国石油化工股份有限公司 | Hydraulic jet fracturing method for U-shaped well |
| CN103603643A (en) * | 2013-11-26 | 2014-02-26 | 中国石油集团长城钻探工程有限公司 | Coal bed gas U-shaped well staged fracturing exploitation technology |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107939370A (en) * | 2017-12-11 | 2018-04-20 | 山东科技大学 | A kind of strip-type underground coal gasification system and production method |
| CN108952719A (en) * | 2018-07-09 | 2018-12-07 | 山东省煤炭技术服务有限公司 | Coal seam gasification second mining loses the method for coal under the conditions of a kind of longwall top coal caving |
| CN109138952A (en) * | 2018-10-29 | 2019-01-04 | 邓晓亮 | A kind of system and method for overcritical underground coal gasification(UCG) output power generation |
| CN109138952B (en) * | 2018-10-29 | 2024-04-19 | 邓晓亮 | System and method for generating power by underground gasification of supercritical coal |
| CN111963137A (en) * | 2019-05-20 | 2020-11-20 | 中国石油天然气股份有限公司 | Underground gasification method for huge thick coal seam |
| CN110469306A (en) * | 2019-08-05 | 2019-11-19 | 邓惠荣 | Coal seam oil reservoir underground detonation direction and location crack gas injection produces gas method |
| CN110578508A (en) * | 2019-08-05 | 2019-12-17 | 邓惠荣 | Horizontal well one-well multi-mining combined coal bed gas mining and coal gasification method |
| CN110939424A (en) * | 2019-11-27 | 2020-03-31 | 西安物华巨能爆破器材有限责任公司 | Well-free underground coal gasification ignition method |
| CN114876438A (en) * | 2022-05-08 | 2022-08-09 | 太原理工大学 | Coal mining method for in-situ hydrogen production of filling coal |
| CN114876438B (en) * | 2022-05-08 | 2023-07-21 | 太原理工大学 | Coal mining method for in-situ hydrogen production of filled coal |
| CN117684918A (en) * | 2024-02-04 | 2024-03-12 | 中国矿业大学 | Method and device for extracting gas by utilizing coal seam waste heat in sectional advancing type heat injection mode |
| CN117684918B (en) * | 2024-02-04 | 2024-04-12 | 中国矿业大学 | Method and device for extracting gas by utilizing coal seam waste heat in sectional advancing type heat injection mode |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106194147B (en) | 2018-11-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106194147B (en) | The method of straight well horizontal well joint igniting in a kind of underground coal gasification(UCG) exploitation | |
| WO2022252591A1 (en) | Cracking permeability increasing method combining hydraulic fracturing and methane in-situ combustion explosion | |
| CN108678747B (en) | A kind of method and apparatus of pulsed water fracturing control Top coal caving characteristic | |
| US4185693A (en) | Oil shale retorting from a high porosity cavern | |
| WO2017096674A1 (en) | An above ground and underground cooperative control method of far and near field roofs of extra-large stoping space | |
| He et al. | Oil well perforation technology: Status and prospects | |
| CN108643910A (en) | A method of controlling caving for coal mine stope tight roof Advance presplitting | |
| CN104790951B (en) | Weaken the method and device away from the high-order tight roofs of 100 ~ 350m of coal seam | |
| CN102168543B (en) | Method and apparatus of improving recovery efficiency of shale gas through a blast mode | |
| CN101440704B (en) | Ground-dipping ore bed continuous high-energy gas fracturing seepage increasing method and specific high-energy gas generator | |
| CN107503747B (en) | A kind of static blasting economic benefits and social benefits fracturing reduction top plate method | |
| CN105332684A (en) | High-pressure water burst and CO2 fracturing combined coal bed gas displacement extraction technology | |
| CN101614135A (en) | Bore, quick-fried, take out Trinity gas pumping method | |
| CN109025941B (en) | Deflagration fracturing and hydraulic impact fracturing combined pipe column and combined method | |
| CN102817603A (en) | Method communicating ground with underground mining coal bed gas | |
| CN114876434B (en) | In-situ combustion explosion fracturing method for methane in shale gas reservoir seam | |
| CN104296609B (en) | Containing the controlled blasting method of different hardness rock stratum in Deep hole bench balsting | |
| CN105275435B (en) | A kind of method of accurate delay presplit blasting enhanced gas extraction coal-bed gas | |
| CN109209325A (en) | A method of uncovering coal in vertical shaft is carried out using radial technology | |
| Xu et al. | The pressure relief and permeability increase mechanism of crossing-layers directional hydraulic fracturing and its application | |
| CN105041274A (en) | Short-range two-layer oil-gas reservoir commingled production technique | |
| CN103032059B (en) | A kind of directed hydraulic pressure burst communicatin exploitation method | |
| Han et al. | Exploitation technology of pressure relief coalbed methane in vertical surface wells in the Huainan coal mining area | |
| RU2388911C2 (en) | Complex method for development of beds that are dangerous by gas and dust, disposed to mountain bumps and spontaneous emissions | |
| CN115182713A (en) | Shale reservoir three-dimensional horizontal well blasting close-cutting three-dimensional development 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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |