Abstract
Summary In this paper, we present a technique that allows one to perform a short-term well test. The short duration of the test results in reasonably good estimates of formation permeability, skin factor, and reservoir pressure. The technique, referred to as "Quicklook, " requires pressure measurement at the surface and downhole. After perforating, the formation is subjected to an instantaneous-rate drawdown or injection for a couple minutes. The instantaneous-rate period is followed by a shut-in period of sufficient duration to achieve the desired radius of investigation. Three interpretation plots are made to perform the analysis: a derivative type plot for flow-regime identification and type-curve analysis, a specialized plot [rate-convolved Homer (RCH) analysis] for certain flow parameter calculations, and a system-verification plot. A desirable feature of the technique is that the testing and perforating can be performed during the same trip. Two field examples from low-permeability wells illustrate the technique and data interpretation.
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