公开(公告)号：WO2013116381A3

公开(公告)日：2014-05-01

申请号：PCT/US2013023916

申请日：2013-01-30

Applicant: WEATHERFORD LAMB

Inventor： FEASEY GUY F ,  PAVEL DAVID ,  MITCHELL MARK A

IPC: E21B21/08

CPC classification number: E21B21/08 ,  E21B7/12 ,  E21B21/001

Abstract: A method of drilling a subsea wellbore includes drilling the wellbore by injecting drilling fluid through a tubular string extending into the wellbore from an offshore drilling unit (ODU) and rotating a drill bit disposed on a bottom of the tubular string. The method further includes, while drilling the wellbore: mixing lifting fluid with drilling returns at a flow rate proportionate to a flow rate of the drilling fluid, thereby forming a return mixture. The lifting fluid has a density substantially less than a density of the drilling fluid. The return mixture has a density substantially less than the drilling fluid density. The method further includes, while drilling the wellbore: measuring a flow rate of the returns or the return mixture; and comparing the measured flow rate to the drilling fluid flow rate to ensure control of a formation being drilled.

Abstract translation: 钻井海底钻井的方法包括通过从钻井单元（ODU）延伸到井筒中的管柱注入钻井液并旋转设置在管柱的底部上的钻头来钻井孔。 该方法还包括：在钻井井的同时：将提升液与钻井液混合，流量与钻井液的流量成比例，从而形成回流混合物。 提升流体的密度显着小于钻井液的密度。 回流混合物的密度显着小于钻井液密度。 该方法还包括在钻井井时：测量回油或回流混合物的流速; 并将测量的流量与钻井液流量进行比较，以确保正在钻取的地层的控制。

公开(公告)号：AU2013215165A1

公开(公告)日：2014-07-24

申请号：AU2013215165

申请日：2013-01-30

Applicant: WEATHERFORD LAMB

Inventor： FEASEY GUY F ,  PAVEL DAVID ,  MITCHELL MARK A

IPC: E21B21/08

Abstract: A method of drilling a subsea wellbore includes drilling the wellbore by injecting drilling fluid through a tubular string extending into the wellbore from an offshore drilling unit (ODU) and rotating a drill bit disposed on a bottom of the tubular string. The method further includes, while drilling the wellbore: mixing lifting fluid with drilling returns at a flow rate proportionate to a flow rate of the drilling fluid, thereby forming a return mixture. The lifting fluid has a density substantially less than a density of the drilling fluid. The return mixture has a density substantially less than the drilling fluid density. The method further includes, while drilling the wellbore: measuring a flow rate of the returns or the return mixture; and comparing the measured flow rate to the drilling fluid flow rate to ensure control of a formation being drilled.