Vertical seismic profiling method utilizing seismic communication and synchronization
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United States of America Patent
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Jun 23, 2009
Grant Date -
Sep 14, 2006
app pub date -
Mar 8, 2006
filing date -
Mar 9, 2005
priority date (Note) -
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Abstract
A while-drilling Vertical Seismic Profiling (VSP) data acquisition system utilizing the same seismic shots for three purposes is disclosed. First, the seismic shots provide a means for synchronizing a downhole clock in the VSP receiver to a master clock at the surface, thereby enabling correct determination of seismic travel times. Second, the same seismic shots are also used to communicate commands and other information to the downhole VSP receiver, such commands controlling the actions of the VSP receiver or associated devices. Third, the same seismic shots are utilized for purposes of the VSP survey itself, i.e. determination of seismic travel times, forming of seismic images, and determination of geologic and formation fluid properties using the VSP methods.
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