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Vol. 58 No. 5

May 2006

Formation Evaluation

Depth-Accuracy Quantification

Depth is a critical measurement in the economic development of a hydrocarbon asset. Almost all downhole activities, from making petrophysical measurements to setting packers, are performed remotely from surface. The common reference for all such activities is depth. A vertical-depth error of less than 1 m can have a financial effect in the millions of dollars. Although the physical measurement made at the rigsite normally is along-hole depth, vertical depth defines the relationship between subsurface features. The quantification of measured along-hole-depth uncertainty is, therefore, only a partial solution; it also is necessary to estimate vertical uncertainty.

Synopsis of SPE 95611

This article, written by Technology Editor Dennis Denney, contains highlights of paper SPE 95611, "Quantification of Depth Accuracy," by A. Brooks, SPE, and H. Wilson, SPE, Inteq; A. Jamieson, SPE, Tech 21; D. McRobbie, SPE, Sperry Drilling Services; and S.G. Holehouse, SPE, Total S.A., prepared for the 2005 SPE Annual Technical Conference and Exhibition, Dallas, 9-12 October.

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