CN102168544B - Method for surface modification and transmission increase of coal reservoirs by using chlorine dioxide - Google Patents
Method for surface modification and transmission increase of coal reservoirs by using chlorine dioxide Download PDFInfo
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- CN102168544B CN102168544B CN201110074229.6A CN201110074229A CN102168544B CN 102168544 B CN102168544 B CN 102168544B CN 201110074229 A CN201110074229 A CN 201110074229A CN 102168544 B CN102168544 B CN 102168544B
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Abstract
The invention relates to a method for surface modification and transmission increase of coal reservoirs by using chlorine dioxide. The method sequentially comprises the following steps of: (1) selecting the proportioning concentration of the chlorine dioxide according to a coal step and a laboratory experiment; (2) selecting a ground coalbed methane well or an underground drill hole for hydraulic fracturing reservoir modification; (3) pumping chlorine dioxide with selected concentration by stages in the hydraulic fracturing process, wherein the pumping amount in the prepad fluid stage is not less than 70 percent; (4) closing the well for more than 3 hours, and starting to return discharge of a fracturing fluid; and (5) inspecting effects, wherein main indexes comprise critical desorption pressure, daily gas yield and ultimate recovery ratio of the coalbed methane wells or the pumping amount of the underground drill hole. By the method, the daily gas yield and the recovery rate of a single well can be improved, the underground drilling and extraction capability is improved, the extraction efficiency is improved, and the pumping time is shortened.
Description
Technical field
The present invention relates to a kind of chlorine dioxide to the surface modification of coal seam reservoirs and anti-reflection method.
Background technology
Exploitation coal bed gas can obtain the energy, the reduction control of coalmine gas cost of high effect cleaning, also can reduce greenhouse gas emission simultaneously.Ground drilling well breaks through 5000 mouthfuls (ending for the end of the year 2009) in Eastern Margin of Ordos Basin, Qinshui basin, Yangquan, Fuxin, iron processes, Guizhou Liu Panshui, Jiaozhuo, Henan and Anyang etc. in China, and only commercial development has been realized in some areas.Trace it to its cause is that Chinese Occurrence of Coalbed Methane exists " three is low " feature, be low-permeability, low gas content saturation ratio and the low storage ratio that faces, although the reservoir reconstruction yield-increasing technology of taking is to similar abroad, effect is unsatisfactory, is mainly that gas output per well is low, the stable yields cycle is short, recovery ratio is not high.
Summary of the invention
The object of the invention is to provide a kind of chlorine dioxide to the surface modification of coal seam reservoirs and anti-reflection method, can reduce coal seam reservoirs parent methane ability have concurrently anti-reflection, improve down-hole drilling extraction efficiency, shorten the extraction time, eliminate to greatest extent Gas Disaster.
To achieve these goals, the present invention adopts following technical scheme: chlorine dioxide, to the surface modification of coal seam reservoirs and anti-reflection method, comprises the following steps successively: (1) is according to the matched proportion density of coal rank and the selected chlorine dioxide of laboratory test; (2) select to carry out ground coal bed gas well or the down-hole drilling of fracturing reservoir reconstruction; (3) in fracturing process, radially split pump enters to select the chlorine dioxide of concentration, and wherein the infusion amount in the prepad fluid stage is no less than 70%; (4) closing well starts to return discharge fracturing fluid for 3 hours above; (5) validity check, leading indicator comprises critical desorption pressures, daily output tolerance and the ultimate recovery of coal bed gas well, or the extraction amount of down-hole drilling.
Described step (1) coal rank have just determined to adopt the concentration of chlorine dioxide, basic principle: weakly caking coal and following coal rank chlorine dioxide concentration 500 ~ 1000ppm, bottle coal is to the coal rank chlorine dioxide concentration 1000 ~ 3000ppm between lean coal, meager coal and above coal rank chlorine dioxide concentration 3000 ~ 5000ppm.
Described step (1) specifically will be determined according to laboratory experiment with the concentration value of chlorine dioxide, Lan Shi volume according to coal core in soaking front and back permeability and absorption constant and the variation of Lan Shi pressure, select permeability to increase more than 50%, and under uniform pressure condition, adsorbance reduce more than 10% chlorine dioxide concentration value.
Described step (2) reservoir schedule of reinforcement is selected fracturing, the fracturing fluid adopting is active water or clear water, applicable ground coal bed gas well, described ground coal bed gas well fracturing transformation coal seam reservoirs had both comprised that coal seam fracturing first also contained secondary fracturing transformation and the de-plugging construction of coal bed gas well.
Described step (2) fracturing comprises that the waterpower that down-hole coal bed boring adopts is extruded, deep hole high pressure water injection, hydraulic slotted liner technique, hydraulic flushing in hole and waterpower slotting.
Described step (2) active water or clear water the inside companion's note N
2or CO
2.
The present invention utilizes chlorine dioxide and coal seam reservoirs effect, reduced the close methane ability of coal, improved coal seam gas saturation and faced storage ratio, when improving critical desorption pressures, increased the permeability of coal seam reservoirs, improve daily output tolerance and the recovery ratio of coal bed gas well, or down-hole drilling day extraction amount, shorten the extraction time, be conducive to ground coal bed gas exploitation and fire damp and administer.
Reservoir of the present invention is anti-reflection, and to belong to chemolysis anti-reflection, anti-reflection completely different with traditional physics, can also reduce by the mode of chemical modification the close methane ability of coal seam reservoirs, improve facing of reservoir and store up ratio and gas saturation, this is favourable to ground cbm development and fire damp improvement, is mainly manifested in and improves individual well daily output tolerance and recovery ratio; Improve down-hole drilling extraction ability, improve extraction efficiency, shorten the extraction time.
The specific embodiment
Chlorine dioxide, to the surface modification of coal seam reservoirs and anti-reflection method, comprises the following steps successively: (1) is according to the matched proportion density of coal rank and the selected chlorine dioxide of laboratory test; (2) select to carry out ground coal bed gas well or the down-hole drilling of fracturing reservoir reconstruction; (3) in fracturing process, radially split pump enters to select the chlorine dioxide of concentration, and wherein the infusion amount in the prepad fluid stage is no less than 70%; (4) closing well starts to return discharge fracturing fluid for 3 hours above; (5) validity check, leading indicator comprises critical desorption pressures, daily output tolerance and the ultimate recovery of coal bed gas well, or the extraction amount of down-hole drilling.
Described step (1) coal rank have just determined to adopt the concentration of chlorine dioxide, basic principle: weakly caking coal and following coal rank chlorine dioxide concentration 500 ~ 1000ppm, bottle coal is to the coal rank chlorine dioxide concentration 1000 ~ 3000ppm between lean coal, meager coal and above coal rank chlorine dioxide concentration 3000 ~ 5000ppm.
Described step (1) specifically will be determined according to laboratory experiment with the concentration value of chlorine dioxide, variation according to coal core at immersion front and back permeability and absorption constant (Lan Shi volume and Lan Shi pressure), select permeability to increase more than 50%, and under uniform pressure condition, adsorbance reduce more than 10% chlorine dioxide concentration value.
Described step (2) reservoir schedule of reinforcement is selected fracturing, the fracturing fluid adopting is active water or clear water, applicable ground coal bed gas well, described ground coal bed gas well fracturing transformation coal seam reservoirs had both comprised that coal seam fracturing first also contained secondary fracturing transformation and the de-plugging construction of coal bed gas well.
Described step (2) fracturing comprises that the waterpower that down-hole coal bed boring adopts is extruded, deep hole high pressure water injection, hydraulic slotted liner technique, hydraulic flushing in hole and waterpower slotting.
Described step (2) active water or clear water the inside companion's note N
2or CO
2.
The present invention can reduce coal seam reservoirs parent methane ability have concurrently anti-reflection, improve down-hole drilling extraction efficiency, shorten the extraction time, eliminate to greatest extent Gas Disaster.For ground cbm development, can improve critical desorption pressures, improve and face storage than also just equaling to shorten mining initial stage gas breakthrough time; Recovery ratio that the more important thing is coal bed gas under identical exhausted pressure increases.
Claims (4)
1. chlorine dioxide, to the surface modification of coal seam reservoirs and anti-reflection method, is characterized in that: comprise the following steps successively: (1) is according to the matched proportion density of coal rank and the selected chlorine dioxide of laboratory test; (2) select to carry out ground coal bed gas well or the down-hole drilling of fracturing reservoir reconstruction; (3) in fracturing process, radially split pump enters to select the chlorine dioxide of concentration, and wherein the infusion amount in the prepad fluid stage is no less than 70%; (4) closing well starts to return discharge fracturing fluid for 3 hours above; (5) validity check, leading indicator comprises critical desorption pressures, daily output tolerance and the ultimate recovery of coal bed gas well, or the extraction amount of down-hole drilling;
Described step (1) coal rank have just determined to adopt the concentration of chlorine dioxide, basic principle: weakly caking coal and following coal rank chlorine dioxide concentration 500 ~ 1000ppm, bottle coal is to the coal rank chlorine dioxide concentration 1000 ~ 3000ppm between lean coal, meager coal and above coal rank chlorine dioxide concentration 3000 ~ 5000ppm;
Described step (1) specifically will be determined according to laboratory experiment with the concentration value of chlorine dioxide, Lan Shi volume according to coal core in soaking front and back permeability and absorption constant and the variation of Lan Shi pressure, select permeability to increase more than 50%, and under uniform pressure condition, adsorbance reduce more than 10% chlorine dioxide concentration value.
2. chlorine dioxide according to claim 1 is to the surface modification of coal seam reservoirs and anti-reflection method, it is characterized in that: described step (2) pressure break reservoir schedule of reinforcement is selected fracturing, the fracturing fluid adopting is active water or clear water, applicable ground coal bed gas well, described ground coal bed gas well fracturing transformation coal seam reservoirs had both comprised that coal seam fracturing first also contained secondary fracturing transformation and the de-plugging construction of coal bed gas well.
3. chlorine dioxide according to claim 1, to the surface modification of coal seam reservoirs and anti-reflection method, is characterized in that: described step (2) fracturing comprises that the waterpower that down-hole coal bed boring adopts is extruded, deep hole high pressure water injection, hydraulic slotted liner technique, hydraulic flushing in hole and waterpower slotting.
According to the chlorine dioxide described in arbitrary of claim 2 to the surface modification of coal seam reservoirs and anti-reflection method, it is characterized in that: described step (2) active water or clear water the inside companion's note N
2or CO
2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201110074229.6A CN102168544B (en) | 2011-03-28 | 2011-03-28 | Method for surface modification and transmission increase of coal reservoirs by using chlorine dioxide |
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| CN201110074229.6A CN102168544B (en) | 2011-03-28 | 2011-03-28 | Method for surface modification and transmission increase of coal reservoirs by using chlorine dioxide |
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| CN102168544A CN102168544A (en) | 2011-08-31 |
| CN102168544B true CN102168544B (en) | 2014-04-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2780655C1 (en) * | 2021-12-28 | 2022-09-28 | Акционерное общество "Метан Кузбасса" | Method for studying the residual gas content of coal seams being developed in mines |
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| CN103306712B (en) * | 2012-03-06 | 2014-12-31 | 辽宁工程技术大学 | Coal bed gas standing wave exploitation method |
| CN104329055B (en) * | 2013-07-22 | 2017-02-22 | 郝占元 | Method for exploiting coal bed gas |
| CN103396777A (en) * | 2013-07-22 | 2013-11-20 | 郝占元 | Application of chlorine dioxide blocking remover in coal bed modification |
| CN104861952A (en) * | 2014-02-25 | 2015-08-26 | 中国石油化工股份有限公司 | Fracturing fluid for coal-bed gas well and use thereof |
| CN104533374A (en) * | 2014-11-18 | 2015-04-22 | 河南理工大学 | Active water-nitrogen injection combination fracturing fast flow-back production increase method for coal-bed gas well |
| CN104481577B (en) * | 2014-11-21 | 2017-08-04 | 中国矿业大学 | One kind bores the integrated coal seam physical chemistry of the row of cutting point and combines anti-reflection system and method |
| CN104912533B (en) * | 2015-04-20 | 2017-10-24 | 河南理工大学 | A kind of coal seam reservoirs water blocking damage control method |
| CN106867501A (en) * | 2017-02-22 | 2017-06-20 | 山西晋城无烟煤矿业集团有限责任公司 | A kind of coal seam reservoirs transparent agent based on aqueous sodium hypochlorite solution |
| CN106930746B (en) * | 2017-03-06 | 2019-06-04 | 中国矿业大学 | Drilling acetone invades the alternative expression coal seam anti-reflection method combined with hydraulic fracturing |
| CN109577922A (en) * | 2018-11-29 | 2019-04-05 | 山西易高煤层气有限公司 | A kind of method of coal-bed-gas production-increase |
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| CN101644166A (en) * | 2009-07-14 | 2010-02-10 | 中国矿业大学 | Method for extracting gas from high gas low permeability coal seam by punching, slotting, pressure releasing, and permeability increasing |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7431083B2 (en) * | 2006-04-13 | 2008-10-07 | Schlumberger Technology Corporation | Sub-surface coalbed methane well enhancement through rapid oxidation |
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Patent Citations (4)
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| CN1221849A (en) * | 1997-09-22 | 1999-07-07 | 瓦斯塔资源有限公司 | Chemically induced stimulation of cleat formation in subterranean coal formation |
| CN101333922A (en) * | 2007-07-06 | 2008-12-31 | 郝东 | Fracturing process for removing breakdown fluid contamination |
| CN101403314A (en) * | 2008-11-18 | 2009-04-08 | 河南理工大学 | Coal mine down-hole drilling hydraulic fracturing anti-reflection mash gas extraction technique |
| CN101644166A (en) * | 2009-07-14 | 2010-02-10 | 中国矿业大学 | Method for extracting gas from high gas low permeability coal seam by punching, slotting, pressure releasing, and permeability increasing |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2780655C1 (en) * | 2021-12-28 | 2022-09-28 | Акционерное общество "Метан Кузбасса" | Method for studying the residual gas content of coal seams being developed in mines |
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