公开(公告)号：EP2480749B1

公开(公告)日：2018-11-14

申请号：EP10762621.0

申请日：2010-09-21

申请人： Statoil Petroleum AS

发明人： KAASA, Glenn-Ole ,  FJALESTAD, Kjetil

IPC分类号： E21B21/08

CPC分类号： E21B21/08

摘要： A method of controlling the annular pressure in a well during a well construction operation. The operation comprises pumping a fluid down a tubing located within the well and extracting the fluid that flows back through an annulus within said well and surrounding the tubing. The method comprises defining a set pressure pref, determining a desired extraction flow rate qc of fluid from said annulus in dependence upon the set pressure pref and a pumped flow rate into the annulus, and configuring an extraction path to achieve said desired extraction flow rate.