火山岩油气钻井的岩石力学特性

Rock Mechanical Properties of Volcanic Formation Drilling

研究了大庆徐家围子地区火山岩地层的岩石力学性质及本构关系,根据现场声波测井资料及岩心资料,通过室内实验及回归分析建立了声波测井资料与火山岩岩石力学特性预测模型,并根据损伤力学的相关理论,推导出火山岩弹塑性损伤本构关系式.实验结果表明,该研究区域火山岩可钻性值相对较高,硬度较大,塑性系数较低,泊松比较低,表现出明显的脆性和弹性特征;火山岩弹塑性损伤本构关系式符合火山岩实际变化规律.

Constitutive equations and mechanical features of volcanic rock formation in Xujiaweizi of Daqing were studied in this paper.Based on acoustic logging data and core data,a mathematic model for describing the relationship between them was established by regression analysis and experiments.Moreover,volcanic elastic and plastic constitutive equation were built up according to the theory of damage mechanics.The results show that volcanic rock in this area has obvious brittle and elastic feature with higher drillability grade,higher hardness,low plastic coefficient and Poisson＇s ratio.In addition,this equation can successfully reflect the change of rock formation.