采矿与安全工程学报
採礦與安全工程學報
채광여안전공정학보
JOURNAL OF MINING AND SAFETY ENGINEERING
2014年
6期
995-1000
,共6页
吞吐压裂%水力强化%透气性
吞吐壓裂%水力彊化%透氣性
탄토압렬%수력강화%투기성
stimulation fracture%hydraulic reinforcement%gas permeability
为了解决低透气性煤层高效抽采的难题，采用穿层孔吞吐压裂水力强化改善煤层透气性。分析了水力强化工艺穿层孔瓦斯运移产出过程，研究了水力强化对硬煤储层和软煤层中瓦斯渗透率的影响，分析了水力强化对煤体渗透率的作用及增透机理，并进行了现场效果应用。结果表明：穿层孔吞吐压裂技术提高了煤层透气性，形成瓦斯产出通道，在硬煤中水力强化可在顶底板形成“虚拟储层”，瓦斯以渗流为主，软煤中以扩散运移为主；吞吐压裂水力强化通过形成洞穴和裂隙，增加煤层渗透性，减少瓦斯抽采流量衰减系数，提高瓦斯抽采效率。现场实施吞吐压裂水力措施后抽采纯量由14.8 m3增加至31.9~42.8 m3；抽采体积分数由14.1%增加至73.9%~77.5%，该技术具有较高的实际推广应用价值。
為瞭解決低透氣性煤層高效抽採的難題，採用穿層孔吞吐壓裂水力彊化改善煤層透氣性。分析瞭水力彊化工藝穿層孔瓦斯運移產齣過程，研究瞭水力彊化對硬煤儲層和軟煤層中瓦斯滲透率的影響，分析瞭水力彊化對煤體滲透率的作用及增透機理，併進行瞭現場效果應用。結果錶明：穿層孔吞吐壓裂技術提高瞭煤層透氣性，形成瓦斯產齣通道，在硬煤中水力彊化可在頂底闆形成“虛擬儲層”，瓦斯以滲流為主，軟煤中以擴散運移為主；吞吐壓裂水力彊化通過形成洞穴和裂隙，增加煤層滲透性，減少瓦斯抽採流量衰減繫數，提高瓦斯抽採效率。現場實施吞吐壓裂水力措施後抽採純量由14.8 m3增加至31.9~42.8 m3；抽採體積分數由14.1%增加至73.9%~77.5%，該技術具有較高的實際推廣應用價值。
위료해결저투기성매층고효추채적난제，채용천층공탄토압렬수력강화개선매층투기성。분석료수력강화공예천층공와사운이산출과정，연구료수력강화대경매저층화연매층중와사삼투솔적영향，분석료수력강화대매체삼투솔적작용급증투궤리，병진행료현장효과응용。결과표명：천층공탄토압렬기술제고료매층투기성，형성와사산출통도，재경매중수력강화가재정저판형성“허의저층”，와사이삼류위주，연매중이확산운이위주；탄토압렬수력강화통과형성동혈화렬극，증가매층삼투성，감소와사추채류량쇠감계수，제고와사추채효솔。현장실시탄토압렬수력조시후추채순량유14.8 m3증가지31.9~42.8 m3；추채체적분수유14.1%증가지73.9%~77.5%，해기술구유교고적실제추엄응용개치。
In order to solve the problem of how to efficiently extract the coal seam with low permeabil-ity, the hydraulic measures of stimulation fracturing through strata borehole has been adopted to im-prove the permeability of coal seam. The gas migration process through borehole in the hydraulic en-hanced technology has been analyzed. The effect of hydraulic reinforcement measures on hard and soft coal seam permeability has been studied, and the effect and mechanism of hydraulic reinforcement on the permeability of coal mass has been analyzed, and finally, the field experiment of hydraulic fracturing has been carried out. Research results show that the hydraulic measures of stimulation fracturing through strata borehole technology can improve the permeability of coal seam and contribute to form gas flow channel. There is“virtual reservoir”in roof and floor in hard coal seam and the gas shows see-page mainly, while, in soft coal seam gas shows diffusion migration mainly. The hydraulic measures of stimulation fracturing can increase the permeability of coal seam through formation of cave and cracks in it, release ground stress and reduce gas flow attenuation coefficient, and consequently improve efficiency of the gas drainage. By using hydraulic fracturing measures in coal seam the pure quantity of gas drainage increases from 14.8 m3 to 31.9-42.8 m3; the gas concentration increases from 14.1% to 73.9%-77.5%. This technology has very wide popularization and application prospects.
