FRACTIONAL FLOW
SWCT. Non-destructive, in situ method for measuring fractional flow and relative permeability.
Deep investigation. Results typically represent hundreds of barrels of pore space in the test zone.
Native State. The tracers operate in native-state wetability pore space contacting live crude oil, live water at reservoir temperature. The problems that make laboratory measurement of these parameters difficult are easily overcome by carrying out the measurement in situ.
OPERATIONAL STEPS
| 1. |
Inject water plus 3 ester tracers into 100% oil production zone. Each tracer has a different partition coefficient (K value) as shown. |
| 2. |
Push esters farther into zone with more water carrying a material balance tracer. |
| 3. |
Shut in well for a two to six day period for hydrolysis reaction to proceed. |
| 4. |
Produce well and analyze returning water for tracer content. |
| 5. |
Calculate fractional flow from separation between reaction product alcohol tracers and remaining ester tracers. |
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