METHOD OF DRILLING A WELL AT OR UNDER BALANCE USING A ELECTRICAL SUBMERSIBLE PUMP

摘要

A drilling system for use in a well bore consists of a drill string, anelectrically powerable pump (8), a connector (16) for supporting the pump (8)including a through bore (32) through which fluid can flow, and a power cable(15) to provide power to the electrically powerable pump. The cuttings arepumped up through the drillpipe (3). The drill bit (4) may also be powered bythe pump. Part of the cable is disposed externally to the drill string wherenew pipe sections are added, before passing into the drill string through across-over means (40) further down the drillpipe to connect to theelectrically powerable pump.