SPE Annual Technical Conference and Exhibition 2005
DOI: 10.2118/95611-ms
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Quantification of Depth Accuracy

Abstract: 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 one meter can have a financial impact counted in millions of dollars.However, despite the Industry's heavy reliance on depth, its accuracy is poorly specified. This paper describes a set of error t… Show more

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Cited by 23 publications
(3 citation statements)
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“…As implied by the user story, the uncertainty associated with MDs and TVDs are not always understood outside the directional drilling discipline. The multiple sources of uncertainties for MD have been analyzed (Brooks et al 2005) while correlation methods for depth correction utilizing formation logging have been studied (Dashevskiy et al 2008;Poedjono and Nwosu 2019). Note that Brooks and Wilson (1996) indicate possible errors in MD in the range of 4 to 8 m for a 5000-m long well.…”
Section: Briefmentioning
confidence: 99%
See 1 more Smart Citation
“…As implied by the user story, the uncertainty associated with MDs and TVDs are not always understood outside the directional drilling discipline. The multiple sources of uncertainties for MD have been analyzed (Brooks et al 2005) while correlation methods for depth correction utilizing formation logging have been studied (Dashevskiy et al 2008;Poedjono and Nwosu 2019). Note that Brooks and Wilson (1996) indicate possible errors in MD in the range of 4 to 8 m for a 5000-m long well.…”
Section: Briefmentioning
confidence: 99%
“…Note that one can refer to Bolt (2019) and Brooks et al (2005) for more details about the topic of depth uncertainty. From these references, one can learn that "pipe ballooning" (Lubinski and Althouse 1962), "elasticity" (Brooks et al 2005), and "thermal expansion" (Kyllingstad and Thoresen 2019), or the method used to get the length of each pipe, or the quality of the detection for whether the drillstring is in-slips or not, can all influence the estimation of bit depth. Recursively, each of these sources of influence depend on other quantities or models with their own sources of uncertainties.…”
Section: Semantic Networkmentioning
confidence: 99%
“…Quantification and correction of MD errors caused by standard procedure of depth log generation have drawn a significant attention in the industry. A working group with a SPE Well Positioning Technical Session has published a treatment for the quantification of these depth errors (Brooks et al 2005).…”
Section: Lwd Measured Depth Correctionmentioning
confidence: 99%