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1. (WO2010115834) APPARATUS FOR AND METHOD OF DRILLING A SUBTERRANEAN BOREHOLE

Pub. No.:    WO/2010/115834    International Application No.:    PCT/EP2010/054387
Publication Date: Fri Oct 15 01:59:59 CEST 2010 International Filing Date: Thu Apr 01 01:59:59 CEST 2010
IPC: E21B 21/08
Applicants: MANAGED PRESSURE OPERATIONS PTE LTD
LEUCHTENBERG, Christian
Inventors: LEUCHTENBERG, Christian
Title: APPARATUS FOR AND METHOD OF DRILLING A SUBTERRANEAN BOREHOLE
Abstract:
A control apparatus for use in controlling the fluid pressure in a borehole during drilling of the borehole, the apparatus including an inlet suitable for connection to a pump, a main outlet suitable for connection to a drill pipe, and an overflow outlet suitable for connection to a fluid reservoir, the inlet being connected to the main outlet by a main flow conduit, and the overflow outlet being connected to the main flow conduit by means of an overflow conduit, wherein the overflow conduit is provided with a pressure regulator by means of which the pressure of fluid in the main flow conduit may be maintained at or around a predetermined pressure value.