| 摘要 |
A method of real time analysis and control of a fluid influx from an underground formation into a wellbore being drilled with a drill string, a drilling mud circulating from the surface down to the bottomhole into the drill string and flowing back to the surface in the annulus defined between the wall of the wellbore and the drill string, the method comprising the steps of shutting-in the well, when the influx is detested; measuring the inlet pressure P i or outlet pressure P o of the drilling mud as a function of time at the surface; determining, from the increase of the mud pressure measurement, the time t c corresponding to the minimum gradient in the increase of the mud pressure and controlling the well from the time t o.
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