Experimental study of dynamic and static elastic parameters of tight sandstones under reservoir conditions

被引：0

作者：

School of Energy Resources, China University of Geosciences, Beijing ^{[1
]}

100083, China

不详 ^{[2
]}

Shaanxi

710054, China

不详 ^{[3
]}

Shaanxi

710077, China

机构：

[1] School of Energy Resources, China University of Geosciences, Beijing

[2] College of Geology Engineering and Geomatics, Chang'an University, Xi'an, 710054, Shaanxi

[3] China Petroleum Logging Co. Ltd., Xi'an, 710077, Shaanxi

来源：

Yanshilixue Yu Gongcheng Xuebao | / 3045-3054期

关键词：

Elastic parameters; Reservoir conditions; Rock mechanics; Static/dynamic test;

D O I：

10.13722/j.cnki.jrme.2014.1109

中图分类号：

学科分类号：

摘要：

Differences existed in dynamic and static elastic parameters. In order to obtain the transformation functions between dynamic and static elastic parameters, experiments were done under reservoir conditions, which had important practical significance for fracturing in reservoirs. Rock mechanical properties of tight sandstones under reservoir conditions(including formation temperature and pressure) in Sulige gas field were obtained using the AutoLab 1500 machine made by the New England Research Company. The results demonstrated that dynamic Young's modulus was greater than the static Young's modulus, and there was a liner relationship between them in the same core samples under the same experimental conditions. The dynamic Poisson's ratio was higher than the static Poisson's ratio, but there was no obvious relationship between them. The compressional velocity and shear velocity would both increase when confining pressure increases or temperature decreases in one core sample. The dynamic Young's modulus of one core sample would increase when confining pressure increases or temperature decreases. However, the static Young's modulus of one core sample would increase when confining pressure increases or temperature increases. The dynamic Poisson's ratio of one core sample would decrease but the static one would increase when confining pressure increases. The dynamic Poisson's ratio of one core sample would decrease but the static one would decrease obviously when temperature increases. The mechanism for this phenomenon was analyzed, and the transformation functions between the dynamic and static elastic parameters under different temperature or pressure were obtained. Basic parameters were offered for rock mechanical property researches under reservoir conditions in tight sandstones in Sulige gas field, which provide foundation for the development of oil layer fracturing program. ©, 2015, Academia Sinica. All right reserved.

引用

页码：3045 / 3054

页数：9

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