Dual drill string orienting apparatus and method

Details Dual drill string orienting apparatus and method Dual drill string orienting apparatus and method

1975-06-09

1976-05-11

Abbott, Frank L.

Wells

With below and above ground modification

Eduction pump or plunger in well

166 75A, 166 85, 251 1A, 285 28, E21B 3303

Patent

active

039556220

ABSTRACT:
Apparatus and method for orienting a pair of drill strings or the like in a predetermined manner in the center of a bore through a blowout preventer. The drill strings extend from a vessel floating on the surface of a body of water down through the preventer into a subsea wellhead installation. A first pair of opposed rams are actuated to move the drill strings into a predetermined central zone of the bore through the blowout preventer. These first rams operate under a predetermined maximum compressive force of the rams on the drill strings. Above this force, a second pair of opposed rams are activated to move the drill strings out of the predetermined central zone and into a final centrally oriented zone in the bore through the blowout preventer regardless of the position of the drill strings in the central zone. In this manner, the closing off of the drill strings with respect to the wellhead is facilitated since a proper orientation of the drill strings in the bore through the blowout preventer is provided prior to actuating the blowout preventer.

REFERENCES:
patent: 3072420 (1963-01-01), Lebeaux et al.
patent: 3412789 (1968-11-01), Ralph et al.
patent: 3554278 (1970-12-01), Reistle et al.
patent: 3884298 (1975-05-01), Watkins

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