Title:
METHODS OF DRILLING WITH A DOWNHOLE DRILLING MACHINE
Document Type and Number:
WIPO Patent Application WO/2009/062725
Kind Code:
A3
Abstract:
A drilling system comprising a tool body including a drilling motor (10); a drill bit (12) mounted on the tool body to be rotated by the drilling motor; a mechanism (14) for applying weight to the bit when drilling,- and a control system (16) for controlling the rate of rotation of the bit RPM and the weight applied to the bit WOB during drilling; wherein the control system is configurable to a first mode in which RPM and WOB are controlled to maintain the power on bit at a predetermined maximum; or a second mode in which RPM and WOB are controlled to maintain a predetermined depth of cut DOC; and in use, the control system switches between the first and second modes depending on drilling conditions.
Inventors:
HBAIEB SLIM (FR)
DENOIX HENRI (FR)
DENOIX HENRI (FR)
Application Number:
PCT/EP2008/009636
Publication Date:
September 23, 2010
Filing Date:
November 14, 2008
Export Citation:
Assignee:
SCHLUMBERGER SERVICES PETROL (FR)
SCHLUMBERGER TECHNOLOGY BV (NL)
SCHLUMBERGER HOLDINGS
SCHLUMBERGER CA LTD (CA)
PRAD RES & DEV LTD
HBAIEB SLIM (FR)
DENOIX HENRI (FR)
SCHLUMBERGER TECHNOLOGY BV (NL)
SCHLUMBERGER HOLDINGS
SCHLUMBERGER CA LTD (CA)
PRAD RES & DEV LTD
HBAIEB SLIM (FR)
DENOIX HENRI (FR)
International Classes:
E21B44/02; E21B44/00
Foreign References:
| EP1780372A1 | 2007-05-02 | |||
| US20070056772A1 | 2007-03-15 | |||
| US20030187582A1 | 2003-10-02 |
Attorney, Agent or Firm:
GABRIEL, Franck (36 rue des Etats-Généraux, Versailles, FR)
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