Patent ID: 9176250
Filing Date: 2015-11-03
Classification: A61B,E21B,F21W,G01V,G07F,G16H

Abstract:
1. A method for monitoring reservoir stresses in a subterranean formation, the method comprising: collecting baseline sonic data for the formation using a sonic logging tool before a project on the formation is performed; collecting subsequent sonic data for the formation using a sonic logging tool after collecting the baseline sonic data and after the project on the formation has been performed, wherein the project comprises at least one of (i) recovering hydrocarbons from the formation and (ii) injecting fluid into the formation; calculating Stoneley and cross dipole dispersions using the baseline sonic data and subsequent sonic data; estimating changes in minimum and maximum horizontal stress magnitudes in the formation for the project using the calculated dispersions; and determining a pressure for maintaining integrity of the formation using the changes in minimum and maximum horizontal stress magnitudes.