LWD tool provides reliable shear slowness measurements

摘要

A robust inversion methodology applied to high-quality wideband quadrupole LWD waveforms from a GoM well provides useful information for reservoir evaluation. The acoustic properties of rock formations, such as the velocity and rate of attenuation of different modes of sound waves, are closely related to rock type and formation fluid and can provide useful information for reservoir evaluation. This information can be provided using sonic logging. Obtaining acoustic measurements while drilling, combined with real-time drilling geomechanics evaluation, provides additional benefits, including correlation with surface seismic and monitoring of pore pressure anomalies. Sonic LWD was introduced in the 1990s, enhancing real-time support of the drilling process and also making sonic data more available in highly deviated wells where wireline logs can be difficult to obtain.