RESIDUAL OIL SATURATION (Sor)
SWCT. Non-destructive, in situ method for measuring Sor.
Versatile. Can be carried out on old or new wells, in cased or open hole completions.
Deep investigation. Results typically represent hundreds of barrels of pore space in the test zone.
Precise. Swc results usually measured within ±2 saturation units.
OPERATIONAL STEPS
| 1. |
Inject formation water plus ester tracer into test zone. |
| 2. |
Push ester farther into zone with more formation water carrying a material balance tracer. |
| 3. |
Shut in well for a two to six day period. |
| 4. |
Produce well and analyze returning water for tracer content. |
| 5. |
Calculate Sor from separation between reaction product alcohol tracer and remaining ester tracer. |
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