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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)  
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 precoated-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.
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