US 12,281,552 B2
Strain decomposition method
Robert A. Guyer, Los Alamos, NM (US); Timothy James Ulrich, II, Los Alamos, NM (US); James A. Ten Cate, Los Alamos, NM (US); and Harvey Edwin Goodman, Houston, TX (US)
Filed by Chevron U.S.A. Inc., San Ramon, CA (US); and Triad National Security, LLC, Los Alamos, NM (US)
Filed on Jul. 9, 2021, as Appl. No. 17/371,566.
Claims priority of provisional application 63/049,981, filed on Jul. 9, 2020.
Prior Publication US 2022/0010662 A1, Jan. 13, 2022
Int. Cl. E21B 43/16 (2006.01); G06F 30/20 (2020.01); G06F 111/10 (2020.01)
CPC E21B 43/16 (2013.01) [G06F 30/20 (2020.01); E21B 2200/20 (2020.05); G06F 2111/10 (2020.01)] 18 Claims
OG exemplary drawing
 
1. A system for decomposing material strain, the system comprising:
one or more physical processors configured by machine-readable instructions to:
obtain strain information, the strain information defining strain of a rock from a reservoir to stress;
decompose the strain of the rock into classical strain, hysteretic strain, and residual strain, the classical strain including nonlinear, reversible, elastic part of the strain that is reversed when stress is removed from the rock, the residual strain including part of the strain that remains after stress is removed from the rock, wherein decomposition of the strain of the rock into the classical strain, the hysteretic strain, and the residual strain includes:
determination of the residual strain based on closure of a strain loop for the strain of the rock;
determination of the hysteretic strain using a low order Preisach space model; and
determination of the classical strain based on removal of the residual strain and hysteretic strain from the strain of the rock;
perform simulation of reservoir compressibility with depletion based on the classical strain, the hysteretic strain, and the residual strain of the rock, the simulation of reservoir compressibility with depletion simulating changes in stress in the reservoir due to depletion; and
predict hydrocarbon recovery from the reservoir based on the simulation of reservoir compressibility with depletion.