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1. (WO2017156292) TIME-REVERSED NONLINEAR ACOUSTICS FOR DOWNHOLE PRESSURE MEASUREMENTS

Pub. No.:    WO/2017/156292    International Application No.:    PCT/US2017/021606
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Fri Mar 10 00:59:59 CET 2017
IPC: G01V 1/40
Applicants: LOS ALAMOS NATIONAL SECURITY, LLC
CHEVRON U.S.A INC.
Inventors: JOHNSON, Paul, A.
ULRICH II, Timothy, J.
LE BAS, Pierre-Yves
GUYER, Robert, A.
GOODMAN, Harvey, E.
REMILLIEUX, Marcel, C.
Title: TIME-REVERSED NONLINEAR ACOUSTICS FOR DOWNHOLE PRESSURE MEASUREMENTS
Abstract:
Apparatus (10) and methods for combining time reversal and elastic nonlinearity of formation materials for qualtitatively probing for over-pressured regions down hole in advance of a well drilling bit, to determine the distance to the over-pressured region, and for accurately measuring pore pressure downhole in a formation, are described. Classical and reciprocal time reversal methods may be utilized to achieve these measurements.