Wireline apparatus for measuring steaming potentials and determining earth formation characteristics
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United States of America Patent
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Dec 27, 2005
Grant Date -
Dec 22, 2005
app pub date -
Jun 18, 2004
filing date -
Jun 18, 2004
priority date (Note) -
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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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