CN102168544A - 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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- CN102168544A CN102168544A CN2011100742296A CN201110074229A CN102168544A CN 102168544 A CN102168544 A CN 102168544A CN 2011100742296 A CN2011100742296 A CN 2011100742296A CN 201110074229 A CN201110074229 A CN 201110074229A CN 102168544 A CN102168544 A CN 102168544A
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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 surface modification and the anti-reflection method of a kind of chlorine dioxide to coal seam reservoirs.
Background technology
The 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.China breaks through 5000 mouthfuls (by the end of the year 2009) in ground drilling wells such as east, basin, Erdos edge, basin, Qinshui, Yangquan, Fuxin, iron processes, Guizhou Liu Panshui, Jiaozhuo, Henan and Anyang, and only commercial development has been realized in some areas.Trace it to its cause is that Chinese coal bed gas is composed " three the is low " characteristics that exist, be low-permeability, low gas content saturation ratio and the low storage ratio that faces, though the reservoir reconstruction yield-increasing technology of taking is to similar abroad, effect is unsatisfactory, mainly is that gas output per well is low, the stable yields cycle short, recovery ratio is not high.
Summary of the invention
The object of the invention is to provide surface modification and the anti-reflection method of a kind of chlorine dioxide to coal seam reservoirs, can reduce coal seam reservoirs parent methane ability have concurrently anti-reflection, improve down-hole drilling extraction efficient, shorten the extraction time, eliminate the gas disaster to greatest extent.
To achieve these goals, the present invention adopts following technical scheme: chlorine dioxide may further comprise the steps successively to the surface modification and the anti-reflection method of coal seam reservoirs: (1) is according to the matched proportion density of coal rank and the selected chlorine dioxide of laboratory test; (2) the ground coal bed gas well or the down-hole drilling of fracturing reservoir reconstruction carried out in selection; (3) in the fracturing process, radially split pump goes into 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 begins the row's of returning fracturing fluid more than 3 hours; (5) validity check, leading indicator comprise 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 the lean coal, meager coal and above coal rank chlorine dioxide concentration 3000 ~ 5000ppm.
Described step (1) specifically will be decided according to laboratory experiment with the concentration value of chlorine dioxide, according to coal core the Lan Shi volume in permeability and the absorption constant and variation of Lan Shi pressure before and after soaking, select permeability to increase more than 50%, and the chlorine dioxide concentration value of adsorbance reduction more than 10% under the uniform pressure condition.
Described step (2) reservoir schedule of reinforcement is selected fracturing, the fracturing fluid that adopts is active water or clear water, be suitable for the ground coal bed gas well, the coal bed gas well fracturing of described ground is transformed coal seam reservoirs and had both been comprised that coal seam fracturing first also contained the 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 is adopted 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 annotate N
2Or CO
2
The present invention utilizes chlorine dioxide and coal seam reservoirs effect, reduced the close methane ability of coal, improve the coal seam gas saturation and faced the storage ratio, when improving critical desorption pressures, increased the permeability of coal seam reservoirs, improve the daily output tolerance and the recovery ratio of coal bed gas well, or down-hole drilling day extraction amount, shorten the extraction time, help ground cbm development 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 the close methane ability of coal seam reservoirs by the mode of chemical modification, improve facing of reservoir and store up ratio and gas saturation, this is favourable to ground cbm development and fire damp improvement, mainly shows to improve individual well daily output tolerance and recovery ratio; Improve down-hole drilling extraction ability, improve extraction efficient, shorten the extraction time.
The specific embodiment
Chlorine dioxide may further comprise the steps successively to the surface modification and the anti-reflection method of coal seam reservoirs: (1) is according to the matched proportion density of coal rank and the selected chlorine dioxide of laboratory test; (2) the ground coal bed gas well or the down-hole drilling of fracturing reservoir reconstruction carried out in selection; (3) in the fracturing process, radially split pump goes into 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 begins the row's of returning fracturing fluid more than 3 hours; (5) validity check, leading indicator comprise 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 the lean coal, meager coal and above coal rank chlorine dioxide concentration 3000 ~ 5000ppm.
Described step (1) specifically will be decided according to laboratory experiment with the concentration value of chlorine dioxide, according to of the variation of 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 the chlorine dioxide concentration value of adsorbance reduction more than 10% under the uniform pressure condition.
Described step (2) reservoir schedule of reinforcement is selected fracturing, the fracturing fluid that adopts is active water or clear water, be suitable for the ground coal bed gas well, the coal bed gas well fracturing of described ground is transformed coal seam reservoirs and had both been comprised that coal seam fracturing first also contained the 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 is adopted 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 annotate N
2Or CO
2
The present invention can reduce coal seam reservoirs parent methane ability have concurrently anti-reflection, improve down-hole drilling extraction efficient, shorten the extraction time, eliminate the gas disaster to greatest extent.For the ground cbm development, can improve critical desorption pressures, improve to face to store up and see the gas time than also just equaling to shorten row's initial stage of adopting; Recovery ratio that the more important thing is coal bed gas under identical exhausted pressure increases.
Claims (6)
1. chlorine dioxide is characterized in that: may further comprise the steps successively the surface modification and the anti-reflection method of coal seam reservoirs: (1) is according to the matched proportion density of coal rank and the selected chlorine dioxide of laboratory test; (2) the ground coal bed gas well or the down-hole drilling of fracturing reservoir reconstruction carried out in selection; (3) in the fracturing process, radially split pump goes into 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 begins the row's of returning fracturing fluid more than 3 hours; (5) validity check, leading indicator comprise critical desorption pressures, daily output tolerance and the ultimate recovery of coal bed gas well, or the extraction amount of down-hole drilling.
2. chlorine dioxide according to claim 1 is to the surface modification and the anti-reflection method of coal seam reservoirs, it is characterized in that: 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 the lean coal, meager coal and above coal rank chlorine dioxide concentration 3000 ~ 5000ppm.
3. chlorine dioxide according to claim 2 is to the surface modification and the anti-reflection method of coal seam reservoirs, it is characterized in that: described step (1) specifically will be decided according to laboratory experiment with the concentration value of chlorine dioxide, according to coal core the Lan Shi volume in permeability and the absorption constant and variation of Lan Shi pressure before and after soaking, select permeability to increase more than 50%, and the chlorine dioxide concentration value of adsorbance reduction more than 10% under the uniform pressure condition.
4. chlorine dioxide according to claim 3 is to the surface modification and the anti-reflection method of coal seam reservoirs, it is characterized in that: described step (2) reservoir schedule of reinforcement is selected fracturing, the fracturing fluid that adopts is active water or clear water, be suitable for the ground coal bed gas well, the coal bed gas well fracturing of described ground is transformed coal seam reservoirs and had both been comprised that coal seam fracturing first also contained the secondary fracturing transformation and the de-plugging construction of coal bed gas well.
5. chlorine dioxide according to claim 3 is characterized in that the surface modification and the anti-reflection method of coal seam reservoirs: described step (2) fracturing comprises that the waterpower that down-hole coal bed boring is adopted is extruded, deep hole high pressure water injection, hydraulic slotted liner technique, hydraulic flushing in hole and waterpower slotting.
6. according to surface modification and the anti-reflection method of arbitrary described chlorine dioxide of claim 1-5 to coal seam reservoirs, it is characterized in that: described step (2) active water or clear water the inside companion annotate N
2Or CO
2
Priority Applications (1)
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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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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103306712A (en) * | 2012-03-06 | 2013-09-18 | 辽宁工程技术大学 | Coal bed gas standing wave exploitation method |
| CN103396777A (en) * | 2013-07-22 | 2013-11-20 | 郝占元 | Application of chlorine dioxide blocking remover in coal bed modification |
| CN104329055A (en) * | 2013-07-22 | 2015-02-04 | 郝占元 | Method for exploiting coal bed gas |
| CN104481577A (en) * | 2014-11-21 | 2015-04-01 | 中国矿业大学 | Drilling, cutting, discharging and diversion integrated coal seam physical and chemical combination permeability increase system and method |
| 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 |
| 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 |
| CN104912533A (en) * | 2015-04-20 | 2015-09-16 | 河南理工大学 | Coal reservoir water locking 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 |
| WO2018161470A1 (en) * | 2017-03-06 | 2018-09-13 | 中国矿业大学 | Method sequentially employing acetone erosion and hydraulic fracturing techniques in borehole to increase permeability of coal seam |
| 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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| 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 |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103306712A (en) * | 2012-03-06 | 2013-09-18 | 辽宁工程技术大学 | Coal bed gas standing wave exploitation method |
| CN103306712B (en) * | 2012-03-06 | 2014-12-31 | 辽宁工程技术大学 | Coal bed gas standing wave exploitation method |
| CN103396777A (en) * | 2013-07-22 | 2013-11-20 | 郝占元 | Application of chlorine dioxide blocking remover in coal bed modification |
| CN104329055A (en) * | 2013-07-22 | 2015-02-04 | 郝占元 | Method for exploiting coal bed gas |
| CN104329055B (en) * | 2013-07-22 | 2017-02-22 | 郝占元 | Method for exploiting coal bed gas |
| 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 |
| CN104481577A (en) * | 2014-11-21 | 2015-04-01 | 中国矿业大学 | Drilling, cutting, discharging and diversion integrated coal seam physical and chemical combination permeability increase system and method |
| CN104912533A (en) * | 2015-04-20 | 2015-09-16 | 河南理工大学 | Coal reservoir water locking damage control 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 |
| WO2018161470A1 (en) * | 2017-03-06 | 2018-09-13 | 中国矿业大学 | Method sequentially employing acetone erosion and hydraulic fracturing techniques in borehole to increase permeability of coal seam |
| 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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