岩屑声波法地层压力监测技术研究与应用

提出了通过岩屑提取地层信息、为钻井井壁稳定性计算提供必要参数的方法，即通过测量地面岩屑的声波时差，反演得到地层岩石的声波时差，利用岩石的声学性质与力学参数的关系得到地层岩石的力学参数，结合地应力参数，得到井壁周围岩石的应力分布，计算地层的孔隙压力、坍塌压力和破裂压力。对于预探井，在没有测井资料的情况下，利用该方法可以有效地进行地层压力监测。在两口预探井中进行了随钻监测地层压力的现场试验，证明该方法是有效的。虽然该方法在声波测量过程中还有一定的局限性，对最终计算结果的精确度会产生一定影响，但与单纯的地震资料相比，其精确度已大大提高。

Technology of formation pressure monitoring by measuring cuttings acoustic velocity

The method, parameters for computation of borehole well stabilization in drilling obtained by measuring cuttings acoustic velocity, was presented. The interval transit time of formation rock was calculated by measuring cuttings interval transit time on the ground conditions and then rock mechanics parameters could be gotten according to the relation of acoustic properties and mechanics parameters. Combined with in situ stress distribution, the stress distribution of formation nearby borehole could be achieved, so that the pore pressure, collapse pressure and fracture pressure were calculated. Especially, that is very important for exploration wells because of less well logging information before drilling. Although this method has a certain limitation which could exert an influence for the final result, the conclusions can be gotten by applying in two exploration wells that the measured results are much more accurate than the data gotten by seismic data.