Application of new method for formation pressure monitoring of drilling machinery energy efficiency in Yingqiong Basin,South China Sea
The mechanism of formation overpressure in the Yingqiong Basin of the South China Sea is complex,and the tradi-tional formation pressure monitoring methods have great limitations in field application.Based on this,a new monitoring method in the light of the drilling machinery energy efficiency was adopted,which can invert the formation pressure in real-time through the analysis of rock-breaking efficiency.The result shows that,the MSE data have good response characteristics for both loading and unloading overpressures,and the quantitative monitoring result is in good agreement with the measured data.Meanwhile the overpressure originated from the second member of Yinggehai Formation,and the overpressure in the Huangliu Formation is significant.In some cases,the formation pressure"step"phenomenon occurs.The empirical parame-ters are easy to select,and the formation pressure can be monitored in real-time directly through the parameters while drill-ing.Compared with the traditional Dc index and other methods,the influence of torque is quantitatively considered,and the logging data are combined for comprehensive evaluation,so the monitoring results are more reliable.
South China SeaYingqiong Basinformation pressuremonitoringmechinery energy efficiency
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