METHOD AND APPARATUS FOR PHASED ARRAY ACOUSTIC WELL LOGGING

摘要

A downhole acoustic logging tool uses a phased-array of transmitters and/or receivers to improve the signal level of compressional waves generated by the transmitters and propagating in the formation. The tool comprises a processor which is configured to: (A) activate the plurality of segments sequentially using a time delay which accentuates an axially propagating compressional wave in the formation, (B) determine from the signal a compressional wave velocity of the formation; and (C) record the determined compressional wave velocity on a suitable medium.