Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Shell Canada Ltd
Original Assignee
Shell Canada Limited
Robin Adrianus Hartmann
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Filing date
Publication date
Application filed by Shell Canada Limited, Robin Adrianus HartmannfiledCriticalShell Canada Limited
Priority claimed from PCT/EP1996/005170external-prioritypatent/WO1997019250A1/en
Publication of CA2237013A1publicationCriticalpatent/CA2237013A1/en
Application grantedgrantedCritical
Publication of CA2237013CpublicationCriticalpatent/CA2237013C/en
A method of qualifying a survey of a borehole formed in an earth formation is provided. The method comprises the steps of: a) selecting a sensor for measuring an earth field parameter and a borehole position parameter in said borehole; b) determining theoretical measurement uncertainties of said parameters when measured with the sensor; c) operating said sensor so as to measure the position parameter and the earth field parameter at a selected position in the borehole; d) determining the difference between the measured earth field parameter and a known magnitude of said earth field parameter at said position, and determining the ratio of said difference and the theoretical measurement uncertainty of the earth field parameter, and e) determining the uncertainty of the measured position parameter from the product of said ratio and the theoretical measurement uncertainty of the position parameter.
CA 22370131995-11-211996-11-20Method of qualifying a borehole survey
Expired - LifetimeCA2237013C
(en)