Title:
SYSTEM AND METHODS FOR CONTROLLED MUD CAP DRILLING
Document Type and Number:
WIPO Patent Application WO/2017/195175
Kind Code:
A3
Abstract:
A subsea drilling method for controlling the bottom hole annular pressure and downward injection rate during mud cap drilling operations from a mobile offshore drilling unit with a low pressure marine riser and subsea blowout preventer. The method called controlled mud cap drilling uses the hydrostatic head of a heavy annular mud (fluid) managed or observed in order to balance the highest pore pressure in the well and to control the injection rate, by using a subsea mud lift pump and a control system to regulate the process.
Inventors:
FOSSLI BØRRE (NO)
Application Number:
PCT/IB2017/052823
Publication Date:
December 21, 2017
Filing Date:
May 12, 2017
Export Citation:
Assignee:
ENHANCED DRILLING A S (NO)
International Classes:
E21B43/38; E21B21/00; E21B21/08; E21B47/04
Domestic Patent References:
WO2009123476A1 | 2009-10-08 | |||
WO2011058031A2 | 2011-05-19 | |||
WO2006118920A2 | 2006-11-09 |
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