While-drilling services are effective and efficient in supporting drilling decisions. Real-time processing of seismic borehole data can help drilling operations. We study the problem of bit localization in a vertical layered media by using while-drilling measurements. The signal emitted by the bit is recorded by surface sensors and it is processed in order to obtain direct arrival traveltimes. The traveltimes are the input of a Bayesian inversion procedure for the estimation of the bit position and of the velocity model: the results are the estimated values and their associated uncertainty. We propose a parameterization of the problem and we show the conditioning analysis. We test the inversion strategy on realistic cases with significant results.
Estimation of bit position and velocity model while drilling
BERNASCONI, GIANCARLO;ROVETTA, DIEGO
2007-01-01
Abstract
While-drilling services are effective and efficient in supporting drilling decisions. Real-time processing of seismic borehole data can help drilling operations. We study the problem of bit localization in a vertical layered media by using while-drilling measurements. The signal emitted by the bit is recorded by surface sensors and it is processed in order to obtain direct arrival traveltimes. The traveltimes are the input of a Bayesian inversion procedure for the estimation of the bit position and of the velocity model: the results are the estimated values and their associated uncertainty. We propose a parameterization of the problem and we show the conditioning analysis. We test the inversion strategy on realistic cases with significant results.File | Dimensione | Formato | |
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