This paper discusses pressure responses from a formation with two communicating layers in which a fully penetrated high-permeability layer is adjacent to a low-permeability layer. An analytical reservoir model is presented for well-test analysis of the layered systems, with the bottom of the low-permeability layer being a constant-pressure boundary. The strength of the support from the low-permeability layer is characterized with two parameters: layer bond constant and storage capacity.

Keywords:
reservoir, upstream oil & gas, drillstem testing, reservoir pressure, boundary, pressure response, april 2002, radial flow, derivative, engineering
Subjects:
Drillstem/well testing, Flow in porous media, Formation Evaluation & Management, Reservoir Fluid Dynamics
Copyright 2002, Society of Petroleum Engineers
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