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使用纳米碳酸钙降低低孔低渗煤层气储层伤害 被引量:5
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作者 谷穗 蔡记华 +1 位作者 常德武 维克多.费多罗维奇.契霍特金 《地球科学(中国地质大学学报)》 EI CAS CSCD 北大核心 2015年第6期1093-1100,共8页
传统暂堵剂难以封堵低孔低渗煤层气储层中的大量纳米级别孔隙.通过煤岩显微观测、钻井液基本性能测试、泥饼清除实验、煤岩孔隙分布实验和气体渗透率实验,探讨了纳米碳酸钙降低低孔低渗煤层气储层伤害的效果.结果表明:纳米碳酸钙材料... 传统暂堵剂难以封堵低孔低渗煤层气储层中的大量纳米级别孔隙.通过煤岩显微观测、钻井液基本性能测试、泥饼清除实验、煤岩孔隙分布实验和气体渗透率实验,探讨了纳米碳酸钙降低低孔低渗煤层气储层伤害的效果.结果表明:纳米碳酸钙材料只有在水溶液中保持纳米级的分散状态,才可能对低渗煤岩起到暂堵作用;基于纳米碳酸钙的可降解钻井液既能封堵低孔低渗煤岩中微米级别孔隙,也能封堵其中的纳米级别孔隙;经过生物酶和稀盐酸双重解堵后,煤岩渗透率恢复值达77.17%~97.98%,储层保护效果好;煤岩孔隙分布实验可以在纳米尺度上研究纳米材料对低孔低渗储层的暂堵效果.研究成果可为纳米碳酸钙在低孔低渗煤层和页岩钻完井过程中的应用奠定良好技术基础. 展开更多
关键词 纳米碳酸钙 低渗煤层气储层 暂堵 储层保护 气体透率 孔隙分布.
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低渗煤层多脉冲压裂激励作用的裂缝模型研究 被引量:3
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作者 刘敬 吴晋军 周培尧 《煤炭技术》 CAS 北大核心 2016年第1期1-4,共4页
为了提高适用于低渗煤层气高能气体压裂开发的技术水平,结合全封闭多脉冲压裂工艺特点,分析了多脉冲加载激励煤层产生多裂缝松弛地应力的作用机理及p-T作用过程,研究建立其多裂缝物理模型。该模型为低渗煤层全封闭多脉冲压裂瞬间破岩成... 为了提高适用于低渗煤层气高能气体压裂开发的技术水平,结合全封闭多脉冲压裂工艺特点,分析了多脉冲加载激励煤层产生多裂缝松弛地应力的作用机理及p-T作用过程,研究建立其多裂缝物理模型。该模型为低渗煤层全封闭多脉冲压裂瞬间破岩成缝机理研究及优化工艺设计提供了理论参考。 展开更多
关键词 低渗煤层气 多脉冲压裂 多裂缝模型
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Pulsating hydraulic fracturing technology in low permeability coal seams 被引量:10
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作者 Wang Wenchao Li Xianzhong +1 位作者 Lin Baiquan Zhai Cheng 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2015年第4期681-685,共5页
Based on the difficult situation of gas drainage in a single coal bed of high gas content and low perme- ability, we investigate the technology of pulsating hydraulic pressure relief, the process of crank plunger move... Based on the difficult situation of gas drainage in a single coal bed of high gas content and low perme- ability, we investigate the technology of pulsating hydraulic pressure relief, the process of crank plunger movement and the mechanism of pulsating pressure formation using theoretical research, mathematical modeling and field testing. We analyze the effect of pulsating pressure on the formation and growth of fractures in coal by using the pulsating hydraulic theory in hydraulics. The research results show that the amplitude of fluctuating pressure tends to increase in the case where the exit is blocked, caused by pulsating pressure reflection and frictional resistance superposition, and it contributes to the growth of fractures in coal. The crack initiation pressure of pulsating hydraulic fracturing is 8 MPa, which is half than that of normal hydraulic fracturing; the pulsating hydraulic fracturing influence radius reaches 8 m. The total amount of gas extraction is increased by 3.6 times, and reaches 50 LJmin at the highest point. The extraction flow increases greatly, and is 4 times larger than that of drilling without fracturing and 1.2 times larger than that of normal hydraulic fracturing. The technology provides a technical measure for gas drainage of high gas content and low permeability in the single coal bed. 展开更多
关键词 Gas drainage Pulsating hydraulic fracturing Fatigue damage Permeability improvement
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Analytical solution of coal-bed methane migration with slippage effects in hypotonic reservoir 被引量:1
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作者 XIAO Xiao-chun PAN Yi-shan YU Li-yan JIANG Chun-yu 《Journal of Coal Science & Engineering(China)》 2011年第2期137-141,共5页
Using theoretical analysis, the single-phase gas seepage mathematical model influenced by slippage effects was established. The results show that the pressure of producing wells attenuates more violently than the well... Using theoretical analysis, the single-phase gas seepage mathematical model influenced by slippage effects was established. The results show that the pressure of producing wells attenuates more violently than the wells without slippage effects. The decay rate of reservoir pressure is more violent as the Klinkenherg factor increases. The gas prediction output gradually increases as the Klinenberg factor increases when considering gas slippage effects. Through specific examples, analyzed the law of stope pore pressure and gas output forecast changing in a hypotonic reservoir with slippage effects. The results have great theoretical significance in the study of the law of coal-bed methane migration in hypotonic reservoirs and for the exploitation of coal-bed methane. 展开更多
关键词 slippage effect hypotonic reservoir Klinkenberg factor analysis solution
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Technique of coal mining and gas extraction without coal pillar in multi-seam with low permeability 被引量:5
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作者 YUAN Liang 《Journal of Coal Science & Engineering(China)》 2009年第2期120-128,共9页
Aimed at the low mining efficiency in deep multi-seams because of high crustalstress,high gas content,low permeability,the compound 'three soft' roof and the trouble-somesafety situation encountered in deep le... Aimed at the low mining efficiency in deep multi-seams because of high crustalstress,high gas content,low permeability,the compound 'three soft' roof and the trouble-somesafety situation encountered in deep level coal exploitation,proposed a new idea ofgob-side retaining without a coal-pillar and Y-style ventilation in the first-mined key pressure-relieved coal seam and a new method of coal mining and gas extraction.The followingwere discovered:the dynamic evolution law of the crannies in the roof is influenced bymining,the formative rule of 'the vertical cranny-abundant area' along the gob-side,thedistribution of air pressure field in the gob,and the flowing rule of pressure-relieved gas ina Y-style ventilation system.The study also established a theoretic basis for a new miningmethod of coal mining and gas extraction which is used to extract the pressure-relievedgas by roadway retaining boreholes instead of roadway boreholes.Studied and resolvedmany difficult key problems,such as,fast roadway retaining at the gob-side without a coalpillar,Y-style ventilation and extraction of pressure-relieved gas by roadway retainingboreholes,and so on.The study innovated and integrated a whole set of technical systemsfor coal and pressure relief gas extraction.The method of the pressure-relieved gasextraction by roadway retaining had been successfully applied in 6 typical working faces inthe Huainan and Huaibei mining areas.The research can provide a scientific and reliabletechnical support and a demonstration for coal mining and gas extraction in gaseous deepmulti-seams with low permeability. 展开更多
关键词 coal seam with low permeability without coal-pillar gob-side roadway retaining roadway retaining and borehole drilling coal mining and gas extraction
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