| 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
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| Source Publication | 51st US Rock Mechanics / Geomechanics Symposium 2017 |
| 2017 | |
| Pages | 666-671 |
| Conference Name | 51st US Rock Mechanics / Geomechanics Symposium 2017 |
| Conference Date | June 25, 2017 - June 28, 2017 |
| Conference Place | San Francisco, CA, United states |
| Abstract | 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. |
| Keyword | 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 | 9781510857582 |
| Indexed By | EI |
| Language | 英语 |
| Document Type | 会议论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/78011 |
| Collection | 流固耦合系统力学重点实验室 |
| Affiliation | 1.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]51st US Rock Mechanics / Geomechanics Symposium 2017,2017:666-671. |
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| File Name/Size | DocType | Version | Access | License | ||
| EiCpA038.pdf（738KB） | 会议论文 | 开放获取 | CC BY-NC-SA | View Download | ||
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