关键词: 井壁稳定, 预测, 层速度, 神经网络

Abstract: Borehole stability is generally studied during drilling or after drilling.By analyzing drilling log,logging data and core data in detail,the leading mechanism of borehole instability is acquired,the safe mud weight program and mud system are selected.This approach is easy and practical for the drilled well,but the result may be impractical for the well to be drilled because of the change of geologic structure.In addition,the stability of wildcat well is generally determined by experience,so the disaster at complex formations is unable to avoid.In order to prevent from borehole instability problems,a new method for predicting borehole stability before drilling is studied closely in this paper.According to neural network theory,a new model for predicting borehole stability by seismic data is established,and is successful in field application.

Key words: borehole stability, predication, seismic data, neural network