用Mohr-Coulomb破坏准则预测最小水平主应力的实验方法  

Determination of minimum in-situ stress from normalized Mohr-Coulomb failure criteria

作　　者：张保平[1] 方竞[2] 丁云宏[3] 田国荣[4] 申卫兵[4] 汪永利[3] 

机构地区：[1]北京大学中国石油勘探开发研究院廊坊分院 [2]北京大学 [3]中国地质大学(北京) [4]中国石油勘探开发研究院廊坊分院

出　　处：《石油勘探与开发》2003年第6期89-91,共3页Petroleum Exploration and Development

摘　　要：通过岩石力学实验,测定岩样的内聚力、摩擦系数和单轴抗压强度等岩石力学参数,可以用常规的Mohr Coulomb破坏准则确定最小主应力。采用长庆油田、二连油田、吉林油田和四川盆地、塔里木盆地以及委内瑞拉将要进行水力压裂施工的砂岩地层的岩样,用该方法测定最小主应力,将测定结果与长源距声波测井和微压裂测定结果对比,误差一般为2～3MPa,证实这是一种经济可靠的方法。Minimum in-situ stress could be obtained from normalized Mohr-Coulomb failure criteria through rock mechanical property testing. These properties include cohesion, frictional angle and uniaxial strength along failure plane. Tested samples were taken from different sandstone formations of Changqing, Erlian, Jilin Oilfield, Sichuan and Tarim Basin and Venezuela and hydraulic fracturing treatments would be performed in these formations. By comparing experimental results with those obtained from long distance sonic logging and mini-frac, it showed that the differences were within 2-3MPa. So it is an economic and reliable method to determine minimum in-situ stress from normalized Mohr-Coulomb failure criteria.

关 键 词：最小主应力 Mohr-Coulomb破坏准则 砂岩地层 实验研究 

分 类 号：TE357[石油与天然气工程—油气田开发工程]