Measuring and testing – Borehole or drilling – Formation logging
Reexamination Certificate
2005-12-27
2005-12-27
Williams, Hezron (Department: 2856)
Measuring and testing
Borehole or drilling
Formation logging
C073S152520
Reexamination Certificate
active
06978672
ABSTRACT:
Earth formations are characterized by using an array of electrodes which can measure streaming potentials in the formation, and by interpreting the data obtained by the electrodes. The electrodes are placed on a wireline tool, a LWD tool, or in a fixed manner about a completed wellbore. The measured streaming potentials are generated by drilling with an overbearing pressure, slitting the mudcake in a borehole, acid injection, or any of various other manners which causes fluid movement. The data obtained is interpreted to locate fractures, measure formation permeability, estimate formation pressure, monitor drilling fluid loss, detect abnormal pressure, etc. Particularly, a streaming potential voltage transient having a double peak profile signifies the presence of a formation fracture.
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Bryant Ian
Chen Min-Yi
Navarro Jose
Raghuraman Bhavani
Supp Michael G.
Batzer William B.
DeStefanis Jody Lynn
Fitzgerald John
Gaudier Dale
Schlumberger Technology Corporation
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