Method and apparatus for drilling a borehole into a subsea abnormal pore pressure environment专利检索- .欠平衡技术即井眼流体压力低于地层压力专利检索查询-专利查询网

Method and apparatus for drilling a borehole into a subsea abnormal pore pressure environment
申请号	EP10183265.7	申请日	1999-02-24	公开(公告)号	EP2261457A3	公开(公告)日	2012-09-19
申请人	WEATHERFORD LAMB, INC.;			发明人	Bourgoyne, Adam, T.; Bourgoyne, Darryl, A.; Bourgoyne, Tammy, T.;
摘要	An apparatus for controlling a subsea borehole fluid pressure is proposed for use with a conductor casing (110) positioned below the mudline (57) and within a normal pore pressure environment. The apparatus includes a pump (53) for moving a fluid through a tubular into a borehole. The fluid, before being pumped, exerts a pressure less than the pore pressure of an abnormal pore pressure environment (10). The fluid in the borehole is then pressurized by the pump (53) to at least a borehole pressure equal to or greater than the pore pressure of an abnormal pore pressure environment (10). A pressure housing assembly (15) allows for the drilling of a borehole below the conductor casing (110) into an abnormal pore pressure environment (53) while maintaining the pressurized fluid between a borehole pressure equal to or greater than the pore pressure of the abnormal pore pressure environment (10), and below the fracture pressure of the abnormal pore pressure environment (10).
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