FIELD: mining.
SUBSTANCE: group of inventions relates to mining and can be used for shelf drilling. Installation for shelf drilling comprises a platform, such as a ship, pontoon, self-lifting drilling rig, and a drill string connected with said platform to transfer driving force and is additionally equipped with a heaving compensator. On lower end drill string is equipped with a drilling bit, and to platform is suspended bottom support plate, configured for arrangement on sea bottom. On bottom support plate there are clamps for attachment to drill string, which is a collet, designed to clamp drill string, preventing its rotation. Collet has a body resting on bottom support plate and equipped with wedge clamps. Wedge clamps are connected with said body to rotate. Also disclosed is a method of shelf drilling.
EFFECT: technical result consists in improvement of reliability and efficiency of shelf drilling.
28 cl, 4 dwg
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