CN106194147B - The method of straight well horizontal well joint igniting in a kind of underground coal gasification(UCG) exploitation - Google Patents
The method of straight well horizontal well joint igniting in a kind of underground coal gasification(UCG) exploitation Download PDFInfo
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- CN106194147B CN106194147B CN201610615786.7A CN201610615786A CN106194147B CN 106194147 B CN106194147 B CN 106194147B CN 201610615786 A CN201610615786 A CN 201610615786A CN 106194147 B CN106194147 B CN 106194147B
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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
- E21B43/295—Gasification of minerals, e.g. for producing mixtures of combustible gases
Abstract
A kind of method of straight well horizontal well joint igniting in being exploited the present invention relates to underground coal gasification(UCG), for current common ignition method since the initial stage underground space is small, it is difficult in the presence of igniting is caused, the problems such as duration of ignition is long, the present invention carries out perforation and fracturing work to coal seam, and mixing combustion adjuvant and oxygen-enriched pilot gas is added, and increases cracking success rate, it can effectively light a fire, save time, human cost.
Description
Technical field
The method of straight well horizontal well joint igniting, belongs to coal underground gas in being exploited the present invention relates to a kind of underground coal gasification(UCG)
Change field.
Background technology
Underground coal gasification(UCG) (UCG) is that combustion gasification generation synthesis gas is transported to ground in coal seam by the coal of underground preservation
Face, can not be adopted especially suitable for conventional method as the energy or industrial chemicals or uneconomic coal seam and coal mine secondary or
Multiple second mining.Output gas may be processed, and by pipeline, coal gas power generation or chemical industry synthesis also can be used directly.Coal
Lower gasification is a multidisciplinary comprehensive energy production technology being integrated of fusion, is related to geology, hydrology, drilling well skill
A series of technologies, the complexities such as art, ignition control technology, product gas process and utilization technology, ecological environmental protection are remote
Super ground gasification.Current common ignition method causes the problems such as igniting is difficult, and the duration of ignition is long since the initial stage underground space is small.
Invention content
In order to solve the above problem of the existing technology, the object of the present invention is to provide a kind of underground coal gasification(UCG) exploitations
The method of middle straight well horizontal well joint igniting, it can be achieved that underground coal gasification(UCG) by the way of the joint igniting of straight well horizontal well
Efficiently igniting.
A kind of method of straight well horizontal well joint igniting in being exploited the present invention relates to underground coal gasification(UCG), including following step
Suddenly：Step 1. carries out coal exploration, and drilling straight-hole, horizontal well, horizontal well is at bottom 50-80cm；Step 2. is bored with cylinder is expanded
Head drills out the hole of a diameter of 80-90cm, a length of 2-4m at estimated igniting, and after reaming, macroscopic void is apart from lower rock stratum 20cm-
50cm；The connection in pit shaft and coal seam uses perforating gun mode perforation；Step 3. carries out high-pressure hydraulic pressure break, pressure break range to coal seam
For 10-15m；Step 4. injects the mixing of weight ratio 1: 2-1: 4 being made of ammonium nitrate and potassium chloride by straight well into coal seam
1-2 tons of object, reinjects the air of the side 15000-25000, injects 0.5-1 tons of oxalic acid later；Pass through water after the completion of step 5. step 4
Horizontal well injects oxygen-enriched pilot gas into coal seam, and balancing underground coal igniter by galvanic couple lights a fire, and constantly injects
Combustion-supporting gas, the oxygen content in gas recovery well monitors extraction gas component, so that it is determined that whether igniting succeeds.
The connection in pit shaft and coal seam uses perforating gun mode perforation in step 2, and specific steps include：Using CUMULATIVE BLASTING
The special lined-cavity charge of the oil/gas well for assembling and being sealed is transported to underground using cable or tubing string and is directed at purpose by principle
Layer, takes electromagnetic detonators to light a fire, mode sequentially Instantaneous detonation initiator, primacord and the cumulative ejection of caber or pressurization
Hole bullet.10~15mm of perforation diameter；The ratio between eyelet geometry short axle and long axis are 0.6-0.8；It aperture track must be along casing table
Surface helix is distributed, can only be at most there are one eyelet in any cross section；Perforation density is 15~25 holes/m.Eyelet will be worn as far as possible
Saturating coal seam injury area, into without hindering area.
Pressure break is carried out in step 3 using prepad fluid slippery water commonly used in the art, load fluid, clean fracturing fluid to apply
Work.For the prop-carrying capacity of abundant seam and enhancing liquid, construction carries out pressure break, design discharge capacity 7.0- using huge discharge mode
10.0m3/ min, wherein oil pipe inject 2.6~2.7m of discharge capacity3/ min, casing inject discharge capacity 4.5-7.5m3/min.In order to reduce hole
2 Proppant Slugs are added in bending friction in eye and crack, each section of pad stage；Construction plus sand are using 20~40 mesh quartz
Sand improves fracture condudtiviy to improve proppant supporting efficiency.
The ingredient of oxygen-enriched pilot gas is made of 60-80% oxygen and 20-40% nitrogen by mass percentage in step 5,
Combustion-supporting gas can be methane or ethane.
Compared with prior art, the method for straight well horizontal well joint igniting has in underground coal gasification(UCG) of the invention exploitation
Following advantageous effect：
1. using cylinder drill bit is expanded, empty size can be adjusted according to different coal, convenient item is provided for follow-up perforation, pressure break
Part, the more conventional drilling well of this method are more flexible, efficient.
2. pair coal seam can expand combustion-supporting gas storage volume after carrying out perforation, fracturing work, increase ignition success rate.
3. mixing combustion adjuvant (ammonium nitrate, potassium chloride, oxalic acid) is added into gas injection well, and injected using oxygen-enriched pilot gas
Mode increases cracking success rate, can effectively light a fire, and has saved time, human cost.
4. by being monitored to oxygen in tail gas, it is known that burning progress, efficiency, it is more acurrate to learn underground combustion situation.
5. horizontal well is combined with straight well, the spy that single branch horizontal well links up coal seam hugger and straight well " point " shape extraction of gas is had concurrently
Point has two well heads of horizontal well and straight well, and draining may be implemented and be carried out at the same time with gas production.
Description of the drawings
Fig. 1 ream operation schematic diagrames.
1. horizontal well；2. straight well；3. nitrogen separation device；4. oxygen rich gas；5. pressure break range；6. ream operation range；
7. combustion adjuvant；8. coal seam
Specific implementation mode
Below by embodiment, technical scheme of the present invention will be further explained in detail.
Embodiment 1
The method of straight well horizontal well joint igniting, includes the following steps in a kind of underground coal gasification(UCG) exploitation：Step 1. into
Row coal exploration, drilling straight-hole (2), horizontal well (1), horizontal well (1) is at coal seam (8) bottom 65cm；Step 2. expansion cylinder drill bit
The hole of a diameter of 85cm, a length of 2m are drilled out at estimated igniting, after reaming, macroscopic void is apart from lower rock stratum 25cm；Pit shaft with
The connection in coal seam (8) uses perforating gun mode perforation；Step 3. carries out high-pressure hydraulic pressure break to coal seam (8), and pressure break is ranging from
12m；The mixture 1 being made of ammonium nitrate and potassium chloride that step 4. passes through straight well (2) injection weight ratio 1: 2 in coal seam (8)
Ton, reinjects the air of 17000 sides, injects 0.5 ton of oxalic acid later；By horizontal well (1) to coal seam after the completion of step 5. step 4
(8) the oxygen-enriched pilot gas (4) of injection in balances underground coal igniter by galvanic couple and lights a fire, and constantly injects methane
Gas, the oxygen content in gas recovery well monitors extraction gas component, so that it is determined that whether igniting succeeds.Oxygen-enriched pilot gas (4)
Ingredient be made of by mass percentage 80% oxygen and 20% nitrogen.
Embodiment 2
The method of straight well horizontal well joint igniting, includes the following steps in a kind of underground coal gasification(UCG) exploitation：Step 1. into
Row coal exploration, drilling straight-hole (2), horizontal well (1), horizontal well (1) is at coal seam (8) bottom 55cm；Step 2. expansion cylinder drill bit
The hole of a diameter of 80cm, a length of 2.5m are drilled out at estimated igniting, after reaming, macroscopic void is apart from lower rock stratum 22cm；Pit shaft
Connection with coal seam (8) uses perforating gun mode perforation；Step 3. carries out high-pressure hydraulic pressure break to coal seam (8), and pressure break is ranging from
11m；The mixture being made of ammonium nitrate and potassium chloride that step 4. passes through straight well (2) injection weight ratio 1: 3 in coal seam (8)
1.5 tons, the air of 18000 sides is reinjected, injects 0.6 ton of oxalic acid later；After the completion of step 5. step 4 by horizontal well (1) to
The oxygen-enriched pilot gas (4) of injection in coal seam (8) balances underground coal igniter by galvanic couple and lights a fire, and constantly injects
Methane gas, the oxygen content in gas recovery well monitors extraction gas component, so that it is determined that whether igniting succeeds.Oxygen-enriched pilot gas
(4) ingredient is made of 70% oxygen and 30% nitrogen by mass percentage.
Embodiment 3
The method of straight well horizontal well joint igniting, includes the following steps in a kind of underground coal gasification(UCG) exploitation：Step 1. into
Row coal exploration, drilling straight-hole (2), horizontal well (1), horizontal well (1) is at coal seam (8) bottom 70cm；Step 2. expansion cylinder drill bit
The hole of a diameter of 85cm, a length of 3m are drilled out at estimated igniting, after reaming, macroscopic void is apart from lower rock stratum 30cm；Pit shaft with
The connection in coal seam (8) uses perforating gun mode perforation；Step 3. carries out high-pressure hydraulic pressure break to coal seam (8), and pressure break is ranging from
13m；The mixture 2 being made of ammonium nitrate and potassium chloride that step 4. passes through straight well (2) injection weight ratio 1: 4 in coal seam (8)
Ton, reinjects the air of 20000 sides, injects 0.8 ton of oxalic acid later；By horizontal well (1) to coal seam after the completion of step 5. step 4
(8) the oxygen-enriched pilot gas (4) of injection in balances underground coal igniter by galvanic couple and lights a fire, and constantly injects methane
Gas, the oxygen content in gas recovery well monitors extraction gas component, so that it is determined that whether igniting succeeds.Oxygen-enriched pilot gas (4)
Ingredient be made of by mass percentage 70% oxygen and 30% nitrogen.
Claims (6)
1. the method for straight well horizontal well joint igniting, includes the following steps in a kind of underground coal gasification(UCG) exploitation：
Step 1. carries out coal exploration, and drilling straight-hole (2), horizontal well (1), horizontal well (1) is at coal seam (8) bottom 50-80cm；
Step 2. is being expected to drill out the hole of a diameter of 80-90cm, a length of 2-4m at igniting with cylinder drill bit is expanded, after reaming, macropore
Hole is apart from lower rock stratum 20cm-50cm；Pit shaft and the connection in coal seam (8) use perforating gun mode perforation；Eyelet geometry is short
The ratio between axis and long axis are 0.6-0.8；Aperture track must along sleeve surface Spiral distribution, any cross section can only at most there are one
Eyelet；Perforation density is 15~25 holes/m；Eyelet penetrates coal seam injury area, into without hindering area；
Step 3. carries out high-pressure hydraulic pressure break, pressure break ranging from 10-15m to coal seam (8)；
The mixing being made of ammonium nitrate and potassium chloride that step 4. passes through straight well (2) injection weight ratio 1: 2-1: 4 in coal seam (8)
1-2 tons of object, reinjects the air of the side 15000-25000, injects 0.5-1 tons of oxalic acid later；
Oxygen-enriched pilot gas (4) is injected in coal seam (8) by horizontal well (1) after the completion of step 5. step 4, is balanced by galvanic couple
Underground coal igniter is lighted a fire, and constantly injects combustion-supporting gas, and oxygen contains in gas recovery well monitors extraction gas component
Amount, so that it is determined that whether igniting succeeds.
2. ignition method according to claim 1, which is characterized in that the perforation diameter using perforating gun mode perforation
For 10~15mm；Perforation density is 15~25 holes/m.
3. ignition method according to claim 1, which is characterized in that designing discharge capacity when the high-pressure hydraulic pressing crack construction is
7.0-10.0m3/ min, wherein oil pipe injects 2.6~2.7m of discharge capacity3/ min, casing inject discharge capacity 4.5-7.5m3/min。
4. ignition method according to claim 1, which is characterized in that construction plus sand are adopted when the high-pressure hydraulic pressing crack construction
With 20~40 mesh quartz sands.
5. according to the ignition method described in Claims 1-4 any claim, which is characterized in that the oxygen-enriched pilot gas
(4) ingredient is made of 60-80% oxygen and 20-40% nitrogen by mass percentage.
6. ignition method according to claim 5, which is characterized in that the combustion-supporting gas is methane or ethane.
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| CN107939370B (en) * | 2017-12-11 | 2020-09-15 | 山东科技大学 | Strip type coal underground gasification system and production method |
| CN108952719B (en) * | 2018-07-09 | 2020-03-03 | 山东省煤炭技术服务有限公司 | Method for coal loss in coal seam gasification re-mining under fully mechanized caving mining condition |
| CN111963137B (en) * | 2019-05-20 | 2022-11-04 | 中国石油天然气股份有限公司 | Underground gasification method for huge thick coal seam |
| 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 |
| 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 |
| CN110939424B (en) * | 2019-11-27 | 2022-04-12 | 西安物华巨能爆破器材有限责任公司 | Well-free underground coal gasification ignition method |
| 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 |
| 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 |
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