A Well-Test Analysis Method Accounting for Pre-Test Operations

摘要

In recent work, we have extended the classical radial flow model used in a standard pressure drawdown or buildup well-test analysis by incorporating an additional parameter characterizing the pumping rate prior to the test. By this means, we develop an approach for estimating the formation hydraulic properties in the vicinity of the wellbore from regular pumping rate-pumping pressure data. In this paper, the approach is established as a well-test analysis method by accomplishing two steps. First, five parameters, including the reservoir transmissivity, storativity, skin factor, and pre-test pumping rate, are determined from analysis of measured data. Second, the average reservoir pressure and drainage radius are determined from a calculation using parameters obtained in the first part.