IMECH-IR  > 流固耦合系统力学重点实验室
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
Source Publication51st US Rock Mechanics / Geomechanics Symposium 2017
2017
Pages666-671
Conference Name51st US Rock Mechanics / Geomechanics Symposium 2017
Conference DateJune 25, 2017 - June 28, 2017
Conference PlaceSan Francisco, CA, United states
AbstractTo 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.
KeywordCarbonation 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
ISBN9781510857582
Indexed ByEI
Language英语
Document Type会议论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/78011
Collection流固耦合系统力学重点实验室
Affiliation1.China University of Petroleum (Huadong), Qingdao, Shandong, China;
2.Institute of Mechanics, Chinese Academy of Sciences, Beijing, China
Recommended Citation
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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