Interference Testing: Detecting a Circular Impermeable or Compressible Subregion

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Abstract
Summary: A practical consideration of the effects of a single, circular, heterogeneous reservoir subregion on interference transient pressure testing is presented. The production well and the observation wells are external to the circular subregion. The internal circular boundary is considered as a constant-pressure source or as an impermeable subregion. The constant-pressure subregion has significant effects on interference pressure responses regardless of the size of the subregion. Ignoring the presence of a neighboring compressible portion of the reservoir, such as a gas or a steam cap, may yield erroneously high storativities and transmissivities. Multiple interference tests may suggest the probable location of the gas cap. The effects of an impermeable subregion are subtle, and in some cases, large, impermeable portions of the reservoir may not be detected by neighboring interference wells. Some interference tests in the presence of an impermeable subregion may yield high values of reservoir storativities, stemming from a pressure response similar in shape to the line-source response. A map of the positions of interference wells that do not permit the detection of an impermeable subregion is presented.

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