CPC E21B 7/128 (2013.01) [E21B 21/08 (2013.01); E21B 21/10 (2013.01)] | 10 Claims |
1. A method of drilling a maritime wellbore with a maritime drilling system configured for fluid reverse circulation without using drilling riser tubulars, characterized by drilling operations without a riser and with reverse circulation, the method comprising:
lowering an injection flexible line (12) of the maritime drilling system from a reel (11) simultaneously with lowering a blow-out preventer (BOP) (19) of the maritime drilling system;
pumping drilling fluid through the injection flexible line (12), supported on the reel (11), of the maritime drilling system such that the drilling fluid is injected below an underwater rotating head with a double seal (13) of the maritime drilling system;
providing, after the drilling fluid is injected, the drilling fluid through a cased bore annular (14) and through an open wellbore annular (15) of the maritime drilling system;
providing, after the drilling fluid is provided through the cased bore annular (14) and the open wellbore annular (15), the drilling fluid through a drill bit (16) of the maritime drilling system, taking cut gravel with the drilling fluid during drilling; and
returning, after the drilling fluid is provided through the drill bit (16), the drilling fluid through a drill string (17) of the maritime drilling system.
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