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本文通过对井壁失稳现象、机理及井壁应力状态的分析和计算,对井壁失稳问题进行了较为深入的研究;结合测井资料和地层破裂试验结果,分析并建立了一套计算地层坍塌压力及地层相关物理力学特征参数的方法和模型。通过应用青东区块已钻井的测井资料进行分析计算并与实际结果进行对比,结果表明:地层坍塌压力和安全钻井液密度窗口的计算结果吻合现场实际情况,所提出的方法和计算结果将为青东区块开发过程中安全快速钻井技术提供可靠的技术基础。
In this paper, through the analysis and calculation of the instability of the borehole wall, the mechanism and the stress state of the borehole wall, a more in-depth study on the instability of the borehole wall is made. Based on the well logging data and the fracture test results, a set of calculations Methods and models of formation collapse pressure and related physical and mechanical parameters of formation. The results of calculation and comparison with the actual results show that the calculation results of formation collapse pressure and safety drilling fluid density window are consistent with the actual situation in the field. The proposed method and calculation result will be Qinghai block during the development of safe and fast drilling technology to provide a reliable technical foundation.