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Method and computer program product for drilling mud design optimization to maintain time-dependent stability of argillaceous formations
Method and computer program product for drilling mud design optimization to maintain time-dependent stability of argillaceous formations
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机译:保持泥质地层随时间变化的稳定性的钻井泥浆设计优化方法和计算机程序产品
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摘要
A method and computer program product of either preventing or minimizing pore pressure increase near the wellbore wall within argillaceous formations through which a borehole has been drilled. By interpreting relevant drilling experience data, the type, extent and time-dependency of wellbore instability mechanisms are determined. The impact of drilling mud designs on the time-dependent wellbore instability and hole enlargement is determined by back-analyzing observed drilling events. At least one field-based criterion relationship between net mud weight reduction percentage ratio and hole enlargement is determined. A maximum allowable percentage ratio(s) of net mud weight reduction and either breakout mud weight or mud weight used for the adopted maximum hole enlargement that the wellbore may experience during drilling is determined. Drilling mud salinity value and salt type to satisfy maximum allowable percentage ratio(s) is then determined.
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