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水合物沉积物试验岩样制备及力学性质研究
李令东1,程远方1,孙晓杰2,崔青1
(1.中国石油大学石油工程学院,山东青岛266580;2.天津中油渤星工程科技有限公司,天津300451)
摘要:
水合物沉积物现场取心及原位力学试验技术难度大、成本高,室内制备岩样是目前对其力学性质研究的主要 手段。采用三轴压力室内直接合成和混合制样两种方法,分别以覆膜砂和膨润土为基质试验制备水合物沉积物岩 样,并进行三轴压缩力学试验^结果表明:尽管沉积物中水合物对基质骨架颗粒存在一定胶结作用,但水合物沉积 物的力学性质仍主要由基质的性质决定,覆膜砂基质水合物沉积物的力学性质明显好于膨润土沉积物;水合物沉积 物的强度及弹性模量随着围压的增加而增加,但泊松比与围压无明显相关性。
关键词:  水合物  水合物沉积物  岩样制备  三轴试验  力学性质
DOI:10.3969/j.issn.1673-5005.2012.04.018
分类号:TE 311
基金项目:国家科技重大专项课题(2008ZX05026-004-11;2011 ZX05026-004-08)
Experimental sample preparation and mechanical properties study of hydrate bearing sediments
LI Ling-dong1,CHENG Yuan-fang1,SUN Xiao-jie2,CUI Qing1
(1. School of Petroleum Engineering in China University of Petroleum,Qingdao 266580,China ;2. Tianjin Boxing Construction and Technology Company limited, China National Petroleum Corporation,Tianjin 300451 , China)
Abstract:
As the original coring and in-situ mechanical experiment are difficult and expensive, the experimental preparation of hydrate bearing sediments is the main approach to studying its mechanical properties. Using the direct synthesis in triaxial cell and compound method respectively, the precoated sand and bentonite base hydrate bearing rock samples were prepared, and the triaxial tests were carried out. The results show that although the hydrate in sediments has certain cementation to rock skeleton particles, the mechanical properties of hydrate bearing sediments mainly depend on the base material. And the pre-coated-sand hydrate deposits are significantly better than the bentonite sediments. The strength and elastic modulus of hydrate bearing deposits increase with the confining pressure increasing, but the Poisson's ratio has no obvious correlation with confining pressure.
Key words:  hydrale  hydrate bearing sediments  rock sample preparation  triaxial test  mechanical properties
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