The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 20, 2021
Filed:
Mar. 26, 2017
Triad National Security, Llc, Los Alamos, NM (US);
Chevron U.s.a. Inc., San Ramon, CA (US);
Harvey E. Goodman, Houston, TX (US);
Timothy James Ulrich, II, Los Alamos, NM (US);
Robert A. Guyer, Los Alamos, NM (US);
Paul A. Johnson, Santa Fe, NM (US);
Marcel C. Remillieux, Los Alamos, NM (US);
Pierre-Yves Le Bas, Los Alamos, NM (US);
TRIAD NATIONAL SECURITY, LLC, Los Alamos, NM (US);
CHEVRON U.S.A. INC., San Ramon, CA (US);
Abstract
Apparatus () and methods for measurement of pore pressure in rock formations through a metal borehole casing () 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 (), (). Time reversal techniques () 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.