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:
Jun. 08, 2021
Filed:
Oct. 24, 2017
Triad National Security, Llc, Los Alamos, NM (US);
Chevron U.s.a. Inc., San Ramon, CA (US);
Harvey Edwin Goodman, Houston, TX (US);
Timothy James Ulrich, II, Los Alamos, NM (US);
Peter Roberts, Los Alamos, NM (US);
Marcel C. Remillieux, Los Alamos, NM (US);
Paul Allan Johnson, Santa Fe, NM (US);
Pierre-Yves Le Bas, Los Alamos, NM (US);
Robert A. Guyer, 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 an open, or cemented and/or cased, borehole are described. Such measurements are achieved using the Dynamic Acoustic Elasticity (DAE) method for characterizing nonlinear parameters by perturbing a selected rock formation volume with a High Amplitude, Low Frequency (HALF) acoustic strain wave, and probing this volume 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.