... dilate core sample shear stress horizontal stress compaction renlie situ horizontal stress porosity sandstone upstream oil & gas western atlas onset reservoir characterization axial stress SPE/ISRM 47199 The effects of porosity and stress on dilatancy in sandstone I. Larsen, E. Fjrer...

... wells 22/10a-T2 and 22/10a-T6. This process is based on calibrating depth indexed measurements at discrete points using core data. The core samples were selected to be representative of the complete range of porosities and various clay volumes throughout the reservoir. The first step...

... to reservoirs subject to strong water-drive. P. 357 drillstem/well testing compressibility intercept drillstem testing formation compressibility compaction calculation equation upstream oil & gas prediction reservoir pressure reservoir characterization overburden stress core sample...

... variability in stress orientation was noted between different formations or with depth. Shear acoustic anisotropy utilizes the polarization of shear acoustic waves propagating through oriented core samples and has proven to be very reliable in determining stress orientation. The observed wellbore elongations...

... Abstract Acoustic tomographic imaging was conducted on a complex stress field generated during indentation into a Berea sandstone core sample. The imaging process used 130 ultrasonic raypaths and 97 pixel elements to construct tomograms perpendicular to the indentation direction. ‘Zeroed...