公开(公告)号：US10648315B2

公开(公告)日：2020-05-12

申请号：US15197449

申请日：2016-06-29

Applicant: Schlumberger Technology Corporation

Inventor： Yawan Couturier ,  Bastiaan Liezenberg ,  Glenn Johnson ,  Vikas Rakhunde ,  Jesse Hardt

IPC: E21B17/01 ,  E21B21/08 ,  E21B33/064 ,  E21B44/00 ,  E21B15/02 ,  E21B21/00 ,  E21B21/10 ,  E21B34/06 ,  E21B47/06

Abstract: A method includes pumping fluid into a drill string extending through a riser into a well. A managed pressure drilling system is operated to maintain a selected fluid pressure in the well between the well and the drill string. A fluid influx into the well or a fluid loss into a formation traversed by the well is detected using measurements of fluid pressure in the well and fluid flow into and out of the well. The method includes automatically abating the fluid influx by closing an annular blowout preventer disposed in the riser or abating the fluid loss by operating the annular blowout preventer and pumping a sacrificial fluid into the drill string.