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Pore structure and Mechanical Property Change of different rocks under nitrogen freezing
Shi X1; Zhang L1; Cheng YF1; Li BL2; Yang L(杨柳)1
2017
会议名称51st US Rock Mechanics / Geomechanics Symposium 2017
会议日期June 25, 2017 - June 28, 2017
会议地点San Francisco, CA, United states
会议录名称51st US Rock Mechanics / Geomechanics Symposium 2017
页码666-671
摘要To better understand the liquid nitrogen freezing effect on different rocks, shale, coal, sandstone and carbonate were chosen to investigate the pore structure and mechanical properties damage before and after liquid nitrogen freezing. Experimental study shows that an increase in the number and volume of pores for all rocks after freezing. However, the influence of nitrogen freezing on carbonate was not obvious because of intense mineral compaction and poor connectivity of pores. There was also an obvious reduction in Young's modulus and unconfined compressive strength for coal. Especially, the average decrease ratio of Young's modulus was approximately 0.43 and the average decrease ratio of unconfined compressive strength was 0.63 after and before freezing for all coal samples, which reflected strong freezing damage capability of liquid nitrogen. The mechanical properties also clearly decreased after liquid nitrogen treatment for sandstone samples. Unpronounced changes in shale, and carbonate correlate with tight mineral compaction. These conclusions reflect the characteristics variations of pore structure and mechanical properties were influenced directly by the type of rock during liquid nitrogen freezing. Also, it can provide some insights for avoid wellbore instability during hydraulic fracturing process with liquid nitrogen. © 2017 American Rock Mechanics Association (ARMA). All rights reserved.
关键词Carbonation Coal Compaction Compressive strength Elastic moduli Liquid nitrogen Liquids Mechanical properties Pore structure Rock mechanics Sandstone Shale Coal sample Freezing effect Hydraulic fracturing process Nitrogen treatment Sandstone samples Unconfined compressive strength Wellbore instability
ISBN号9781510857582
收录类别EI
语种英语
文献类型会议论文
条目标识符http://dspace.imech.ac.cn/handle/311007/78011
专题流固耦合系统力学重点实验室
作者单位1.China University of Petroleum (Huadong), Qingdao, Shandong, China;
2.Institute of Mechanics, Chinese Academy of Sciences, Beijing, China
推荐引用方式
GB/T 7714
Shi X,Zhang L,Cheng YF,et al. Pore structure and Mechanical Property Change of different rocks under nitrogen freezing[C],2017:666-671.
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