Completion apparatus for measuring streaming potentials and...

Details Completion apparatus for measuring streaming potentials and... Completion apparatus for measuring streaming potentials and...

2011-02-22

2011-02-22

Dang, Hoang (Department: 3672)

Wells

With electrical means

Indicating

C166S227000, C175S050000, C324S351000, C324S368000

Reexamination Certificate

active

07891417

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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