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1. (WO2017016714) DRILLING APPARATUS AND METHOD FOR PRODUCING A BORE FROM A FLOATING PLATFORM

Pub. No.:    WO/2017/016714    International Application No.:    PCT/EP2016/062491
Publication Date: Fri Feb 03 00:59:59 CET 2017 International Filing Date: Fri Jun 03 01:59:59 CEST 2016
IPC: E21B 41/00
E21B 44/00
E21B 3/00
E21B 7/128
E21B 15/02
E21B 17/07
E21B 19/09
Applicants: BAUER SPEZIALTIEFBAU GMBH
Inventors: SPREITZER, Stefan
Title: DRILLING APPARATUS AND METHOD FOR PRODUCING A BORE FROM A FLOATING PLATFORM
Abstract:
The invention relates to a drilling apparatus and a method for producing a bore in the bottom of a body of water from a floating platform (4) which is exposed to lifting motions, in particular a wave motion of the body of water (8), wherein the drilling apparatus comprises a drill string (10) which comprises at least one drill string element (12, 14, 15, 16) which is displaceable in the axial direction and at least one abutment strip (20, 22) which extends in the axial direction and is in engagement for torque transmission with the formation of a contact surface. The drilling apparatus further comprises a carrier device (30) along which the drill string is substantially vertically displaceable, and a drilling drive (40) for applying a torque to the drill string. The drilling apparatus according to the invention is characterized in that a control unit (50) is provided which is designed to control and reduce the torque of the drilling drive during the drilling operation to a threshold value at which the at least one drill string element is further axially displaceable to compensate for lifting motions when there is friction on the contact surface.