Along-hole depth is the most fundamental subsurface measurement made in our business. Driller's depth, the basis of logging while drilling (LWD) data registration, and wireline logged depth are the primary sources of along-hole depth data. These are rarely congruent. This paper sets out a methodology that can be applied to both wireline and drill pipe along-hole depth measurement (Driller's Way-point Depth, DwpD) and provides an uncertainty calculation that results in True Along-hole (TAH) depth. The result is a reduction in differences between drill pipe and wireline depth measurements, increasing confidence in along-hole depth measurements and increasing well data value. A field data set is reviewed that showed up the similarities and the differences between DwpD and the wireline corrections.

Keywords:
log analysis, well logging, correction model, regime, coefficient, correction, Upstream Oil & Gas, correction methodology, accuracy, along-hole depth measurement
Subjects:
Drilling Operations, Formation Evaluation & Management, Open hole/cased hole log analysis
Copyright 2019, Society of Petroleum Engineers
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