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Given the extreme ecological sensitivity of the Arctic region, new environmentally friendly synthetic oil-base muds (SBM) are likely to be used for drilling wells. Oil company experience using SBM has shown that it can change the wettability of cores, causing great uncertainty in estimates of secondary recovery. For example, the uncertainty in waterflood residual oil saturation due to invasion of SBM has been found to be in excess of 20% PV, which significantly impacts the economics ofdoi:10.2172/840110 fatcat:xrjh6xcz5vgyhb3njgymo2hzrm