Question

What is the significance of the multiple buildups and drawdowns in a DST?

Answer 1

Conventional analysis method of DST buildup period uses Agwarl's equivalent time handling variable rate. Assumption of the method is semi-log radial flow for homogenous reservoir. However for heterogeneous reservoir (double porosity, double permeability) the method will cause pressure derivative curve distortion and the pressure derivation curve cannot match type curve of conventional constant rate. This paper presents a new analysis method of DST pressure history using flow rate deconvolution in Laplace space. Through wellbore storage effect computing history rate and determined pressure response by applying Laplace deconvolution method, we can estimate parameters in Laplace space.

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