JPT

Vol. 59 No. 5

May 2007

Formation Evaluation

Dynamic Depth Correction To Reduce Depth Uncertainty and Improve MWD/LWD Log Quality

Accuracy of measurement-while-drilling (MWD) and logging-while-drilling (LWD) depth measurements can be improved by considering the dynamic variation in drillstring length caused by pipe loading under changing drilling conditions. A new method that uses surface torque, hookload, and temperature measurements was developed to determine force distribution in a drillstring and to compute apparent drillstring length. When available, downhole measurements of torque, weight on bit (WOB), and temperature are used to increase accuracy and robustness of the method

 

View a Synopsis of SPE 103094 published in JPT.

This article, written by Technology Editor Dennis Denney, contains highlights of paper SPE 103094, "Dynamic Depth Correction To Reduce Depth Uncertainty and Improve MWD/LWD Log Quality," by D. Dashevskiy, SPE, T. Dahl, A.G. Brooks, SPE, D. Zurcher, J.C. Lofts, SPE, and S. Dankers, SPE, Inteq, prepared for the 2006 SPE Annual Technical Conference and Exhibition, San Antonio, Texas, 24-27 September.

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