| 摘要 |
Disclosed herein is a method for determining the presence and magnitude of fluid drift within a subterranean formation. A volume of a tracer chemical is injected into the formation by means of a well. The tracer is then displaced through the formation by injecting a volume of tracer-free fluid through the well. The volume of this displacing fluid is at least 25 percent of the total injected fluid. The well is then shut-in for a sufficient period of time for the tracer to move through the formation due to the influence of fluid drift, and the well is then returned to production. By measuring the time periods of production, injection, and shut-in and the corresponding production and injection volumes, the presence and magnitude of fluid drift within the formation can be determined. This method has particular applicability for use in conjunction with a tracer method for determining fluid saturations within the subterranean formation.
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