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Notes:
The first step is to inject water with three partitioning ester tracers. The first few hundred barrels of this water carries in the ester tracers. Three esters are used that have significantly different partition coefficients, K, such as the range of K shown. This water displaces the oil radially away from the well in a Buckley-Leverett flow regime. The profile of oil saturation generated is traced by the three esters because each ester travels with a characteristic oil saturation during injection. The ester carrying water injection is followed by a few hundred barrels of water that does not contain ester. The injection is generally completed in one or two days. When the injection is completed the three esters are positioned at three different distances from the well (highest K is closest to the well). The separation of the esters is a function of the oil saturation gradient and the ester K value.