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液体浸润对页岩裂缝气体流动影响的实验研究

Experimental Research on Influence of Fluid Infiltration on Gas Flow in Shale Fracture
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摘要 为研究液体滞留对无支撑裂缝导流能力的影响,选取志留系龙马溪组地层岩心,开展无支撑单裂缝、多裂缝岩样液体浸润实验。实验结果表明,液体浸润会严重损伤页岩裂缝渗透率,浸润时间越长,气体流动能力损伤越大,液体越难以驱动,气体渗透率达到最大值的时间越长。分析认为,液体滞留在岩样裂缝表面形成水膜,使裂缝宽度减小,从而影响气体流动能力,同时,液体对裂缝内微小矿物颗粒浸泡后,颗粒吸水膨胀也是造成岩样裂缝渗透率减小的一个原因。 In order to research the influence of fluid immersion on gas flow in the fracture, this paper takes shale samples from Longmaxi formation to conduct the experiments of fluid infiltration for unsupported crack and multi - fracture rock. Experimental results show that fluid infiltration can severely damage the shale fracture permeability : the longer the infiltration time, the greater the damage of gas flow ability in fracture, with more difficulty to dis-place ,the longer for gas permeability to reach maximum data. It is considered by analysis that fluid stayed in frac-ture can form a water film in the surface of fracture, which makes the fracture width decrease, and thus affects the gas flow capacity. Meanwhile, tiny mineral grains soaking in liquid in fractures make the particles expansion, and that is also one of the reasons that decrease permeability of the fracture.
作者 修乃岭 严玉忠 卢拥军 王臻 窦晶晶 骆禹 XIU Nailing YAN Yuzhong LU Yongjun WANG Zhen DOU Jingjing LUO Yu(Langfang Branch, Research Institute of Petroleum Exploration and Development,Langfang Hebei 065007, Chin)
出处 《重庆科技学院学报(自然科学版)》 CAS 2017年第3期24-26,38,共4页 Journal of Chongqing University of Science and Technology:Natural Sciences Edition
基金 国家科技重大专项"页岩气储层增产改造技术研究"(2011ZX05018-004) 国家"973"计划项目"中国南方海相页岩气高效开发的基础研究"(2013CB228004)
关键词 页岩 裂缝 渗透率 浸润 shale fracture permeability fluid infiltration
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