陈立超1,2,王生维2,3
Chen Li-chao1,2,Wang Sheng-wei2,3
摘要: 岩石弹性力学性质是储层水力压裂裂缝起裂的重要力学约束,解译弹性力学性质与煤层破裂压力间的数学关系对于气井压裂设计有一定作用。以沁水盆地郑庄区块51口煤层气井为对象,利用声波时差、体密度测井数据反演了近井煤岩弹性力学参数(弹性模量E、剪切模量G、体积模量K、泊松比v)值,计算了表征煤岩破裂实际耗能情况指标——破裂压力当量(Pt)值。通过数学回归发现:中低弹性模量软煤中弹性力学参数(E、G、K)与Pt呈线性正相关关系;对于高弹性模量(E>6GPa)硬煤,发育天然大裂隙煤层Pt较低且随模量(E、G、K)降低而增高(煤粉的堵塞效应),而致密煤层Pt随煤岩模量增大而快速升高。煤岩泊松比(v)与Pt间的关系则不同,高弹性模量硬煤Pt随煤岩泊松比(v)增大而快速升高,而中低模量软煤Pt先随v减小而升高(煤岩脱水效应),后与v呈正相关关系。
中图分类号:
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