This paper was propmwd for presenMon at the 1SSS SPECOE Twm Sympowm on Impmved CM mc.mmnyhold In Tulsa OK, 21-24 April 1SSS. Thta paper was $elected 101pm80ntabon by the SPE Pmgmm Cmnmttt-fdlovnng review of mfonnahon cmtained m an abstract suimMted by tha MhOm, C4ntents of the papef as presented, have not been reviewad by h Saci.ly 01 P@olaum EnG4nams and am whject to COfMCtiOII by tfw umhc+s. Ttw makriat, as Pmwntad, b nOt -Sanly I_@~my positions of the SOCmfy d Petroleum En@INcm or lb wwmbem. Papers presented at SPE meetings am subject to P&4ication review by tha Edtciial Commiltea of the Society of Pefmkm Engnwws. Ponnisslcm to COPYis mrtncted to m @bstmct of not mom then 300 wcidm. Illu$tmtwns may mat be @ad. The atmtmcf should contwn ccmpicucus acknovdedgmenf cd wtwm and by whcun fha -r was pmwnted W nto Libmnm, SPE, PO. Sax SS3S3S, Rmhardwan, TX 7S0S3-SS=, U.S.A., fsx 01-21 4-SS2-9435. AbstraotRelative permeability and anisotropy of absolute permeability are commonly measured quantities in the oil industry. The anisotropy of relative permeability, however, has not been accurately documented previously. Recent measurements of relative permeability on Tensleep sandstone samples from Wyoming demonstrate the magnitude and character of anisotropy that can be expected. Core plugs were cut both parallel and perpendicular to the eolian sandstone bedding planes, then prepared for standard absolute gas permeability measurements, and run through an unsteady state relative permeability apparatus. When flooding perpendicular to bedding, the fractional flow cum is steeper than the curve obtained when flooding parallel to bedding. in other words, more piston like behavior is observed perpendicular to bedding. Such anisotropy characteristics can be used in a simple reservoir simulation to demonstrate the expected changes for a producing reservoir. A significant change is predicted when considering the recovery of oil from horizontal wells in a waterflood as opposed to vertical wells. Properly placed horizontal wells can enhance oil recovery in even the most mature waterflood projects.
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