Title:
OPTIMIZED DRILLING
Document Type and Number:
WIPO Patent Application WO/2012/080819
Kind Code:
A3
Abstract:
The invention provides a method of optimising the rate of penetration of a hydraulically or pneumatically powered rotor and stator driven drill as it drills a wellbore into the earth, the method comprising: (a) measuring a first set of rotor and stator operating parameters including the weight applied to the drill bit, the speed of rotation of the rotor and rotor torque for a first period of time, (b) generating a first set of relationships from the first set of operating parameters to enable the rotor speed and rotor torque to be predicted over a range of operating parameter values, (c) determining the rate of penetration for the first period of time from measurements of weight applied to the bit and rotation speed of the bit, (d) determining whether any other combination of weight applied to bit and rotation speed of bit, provided by the relationships determined in step (b) are capable of providing a greater rate of penetration, and (e) adjusting at least one operating parameter to move the weight applied to bit and/or speed of rotation of bit towards the combination which provides a first greater rate of penetration.
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Inventors:
RINGER MAURICE (GB)
BARRETT MICHAEL (GB)
JEFFRYES BENJAMIN (GB)
ALDRED WALTER (GB)
JOHNSON ASHLEY (GB)
BARRETT MICHAEL (GB)
JEFFRYES BENJAMIN (GB)
ALDRED WALTER (GB)
JOHNSON ASHLEY (GB)
Application Number:
PCT/IB2011/003045
Publication Date:
November 15, 2012
Filing Date:
December 13, 2011
Export Citation:
Assignee:
SCHLUMBERGER TECHNOLOGY BV STBV (NL)
SCHLUMBERGER HOLDINGS LTD SHL
SCHLUMBERGER CA LTD (CA)
SCHLUMBERGER SERVICES PETROL (FR)
PRAD RES AND DEV LTD A BRITISH VIRGIN ISLANDS COMPANY
SCHLUMBERGER SEACO INC (KR)
RINGER MAURICE (GB)
BARRETT MICHAEL (GB)
JEFFRYES BENJAMIN (GB)
ALDRED WALTER (GB)
JOHNSON ASHLEY (GB)
SCHLUMBERGER HOLDINGS LTD SHL
SCHLUMBERGER CA LTD (CA)
SCHLUMBERGER SERVICES PETROL (FR)
PRAD RES AND DEV LTD A BRITISH VIRGIN ISLANDS COMPANY
SCHLUMBERGER SEACO INC (KR)
RINGER MAURICE (GB)
BARRETT MICHAEL (GB)
JEFFRYES BENJAMIN (GB)
ALDRED WALTER (GB)
JOHNSON ASHLEY (GB)
International Classes:
E21B44/06; E21B10/00; E21B44/00
Domestic Patent References:
| WO2010065646A2 | 2010-06-10 |
Foreign References:
| US20080156531A1 | 2008-07-03 | |||
| US20080164062A1 | 2008-07-10 | |||
| US20060162962A1 | 2006-07-27 |
Attorney, Agent or Firm:
GAHLINGS, Steven, A. (Schlumberger Cambridge Research LimitedHigh Cross, Madingley Road, Cambridge CB3 0EL, GB)
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