Title:
ATTITUDE REFERENCE FOR TIEBACK/OVERLAP PROCESSING
Document Type and Number:
WIPO Patent Application WO/2014/059282
Kind Code:
A3
Abstract:
A method for calculating orientation changes within a borehole using a gyro sensor to detect angular deflection rates in an attitude reference interval as a MWD system is moved from a first to a second location within the borehole. A compass shot may be taken at one or more of the first and second locations using a magnetometer and accelerometer or gyro sensor and accelerometer. Tieback and/or overlap processing may be applied to increase the accuracy of measured orientation within the borehole. Additionally, tieback and/or overlap processing may be applied to adjust sensor model parameters in response to discrepancies between calculated and measured locations. Iterated calculations of orientation change between subsequent intervals may allow MWD orientation to be computed for an entire drilling operation using only a single compass shot.
Inventors:
VANSTEENWYK BRETT (US)
Application Number:
PCT/US2013/064552
Publication Date:
July 23, 2015
Filing Date:
October 11, 2013
Export Citation:
Assignee:
SCIENT DRILLING INT (US)
International Classes:
E21B7/00; E21B47/00
Domestic Patent References:
| WO1994011762A1 | 1994-05-26 | |||
| WO2003021278A2 | 2003-03-13 |
Foreign References:
| US6842699B2 | 2005-01-11 |
Other References:
See also references of EP 2906782A4
Attorney, Agent or Firm:
LOCKLAR, Michael (4615 SW Freeway Suite 63, Houston TX, US)
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