地层自然极小漏失压力研究

摘要

By analyzing the leakage mechanism, a concept of minimal leakage pressure is proposed, and of the computation model is developed, which the minimal leakage pressure is the basic condition to define the leakage types. To prevent the leakage, it is very necessary to take the leakage pressure as a independent conception in the analysis of safe drilling fluid densities. Moreover, replacing the fracture pressure curve by leakage pressure is more comprehensive, which the leakage pressure curve in this paper is the aggregation of natural leakage pressure and fracture leakage pressure, or is defined leakage and fracture pressure curve. Therefore, it is comprehensive to use the leakage pressure curve instead of fractured pressure curve in the analysis of safety drilling fluid density.%通过对地层漏失机理的分析,提出了极小漏失压力的概念,并得出自然极小漏失压力计算模型,表明自然极小漏失压力是自然漏失类型分析的基础判断条件.把漏失压力作为一个相对独立的概念纳入到安全钻井液密度分析中,对于预防井漏事故的发生是十分必要的.在钻井液密度分析中,使用漏失压力曲线(自然漏失压力与压裂漏失压力的集合,或者统称为漏破压力曲线)来替代破裂压力曲线比较全面.