Time-reversed nonlinear acoustic downhole pore pressure measurements

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United States of America Patent

PATENT NO 11067711
APP PUB NO 20190250295A1
SERIAL NO

16343975

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Abstract

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Apparatus (10) and methods for measurement of pore pressure in rock formations through a metal borehole casing (32) after a well is cased and cemented, are described. Such measurements may be accomplished by using the Dynamic Acoustic Elasticity (DAE) method for characterizing nonlinear parameters by perturbing a selected rock formation region with a High Amplitude, Low Frequency (HALF) acoustic strain wave, and probing this region using a Low Amplitude, High Frequency (LAHF) acoustic wave (18), (22). Time reversal techniques (36) may be employed for focusing acoustic energy into the formation in the vicinity of the pipe or open hole. The change in wave speed of the probe pulses as the HALF induced strain wave oscillation propagates through the formation, as a function of the induced strain, may be used to determine the nonlinear elastic parameters α, β, δ, and A of the pore pressure, from which the pore pressure may be determined in the region of the HALF wave.

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Patent Owner(s)

Patent OwnerAddress
TRIAD NATIONAL SECURITY LLCLOS ALAMOS NATIONAL LABORATORY LC/TAS P O BOX 1663 LOS ALAMOS NM 87545

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Goodman, Harvey E Houston, US 6 72
Guyer, Robert A Los Alamos, US 8 37
Johnson, Paul A Santa Fe, US 72 1539
Le, Bas Pierre-Yves Los Alamos, US 20 274
Remillieux, Marcel C Los Alamos, US 4 14
Ulrich,, II Timothy James Los Alamos, US 4 2

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