Method of analyzing and controlling a fluid influx during the dr

Details Method of analyzing and controlling a fluid influx during the dr Method of analyzing and controlling a fluid influx during the dr

1990-11-28

1992-01-14

Dang, Hoang C.

Boring or penetrating the earth

With signaling, indicating, testing or measuring

Measuring or indicating drilling fluid rate of flow

73155, 175 50, E21B 4710

Patent

active

050801821

ABSTRACT:
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 and 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 detected; measuring the inlet pressure P.sub.i or outlet pressure P.sub.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.sub.c corresponding to the minimum gradient in the increase of the mud pressure and controlling the well from the time t.sub.c.

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