Method and system for vertical seismic profiling by measuring dr

Details Method and system for vertical seismic profiling by measuring dr Method and system for vertical seismic profiling by measuring dr

1989-07-26

1990-10-23

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Land-reflection type

367 25, 367 40, B01V 140, E21B 47022

Patent

active

049657747

ABSTRACT:
Seismic measurements are taken during drilling operations by an array of seismometers placed on the earth's surface about the axis of a drillstring connected to a conventional drillbit and wherein the drillstring has an arrangement of strain gages and accelerometers mounted thereon in such a way as to measure axial and torsional vibrations of the drillstring. Signals indicating vibrations induced by the drillbit or another source and transmitted through the drillstring are compared with signals received by the seismometer array to determine the characteristics of the formation based on measurement of acoustic velocity from direct and reflected transmission of acoustic vibrations through the formation.

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