Packer box and method for installation or withdrawal of a packer element in, respectively from a packer box for use in petroleum drilling

摘要

A packer box (1) for use in petroleum drilling is described, in which a rotatable packer element (4) arranged centrically in a packer retainer (3) that is orientable and lockable in a sealing position in a housing (2) in the packer box (1) is arranged to seal against a passing drill string (5), the packer element (4) comprising a mounting device (4E) provided with packer slide rings (4J, 4K) at the ends of the mounting device (4E) and being in sealing abutment against slide rings (12B, 12D) arranged internally in the packer retainer (3), and an internal, flexible packer sleeve (4A) which is arranged to abut sealingly against the drill string (5) with an external pressure from a fluid in a volume-compensated annular space (15) in the packer retainer (3), wherein the mounting device (4E) includes several channels (4G) perforating the mounting device (4E), and clamping devices (4C, 4D) for fixing the packer sleeve (4A) to the end portions of the mounting device (4E). A method of installing or withdrawing a packer element (4) in, respectively from, a packer box (1) is described as well.