... well radius boundary condition longtime approximation Drillstem Testing Van Everdingen flow rate constant-rate case anisotropic reservoir transformation reservoir equation drillstem/well testing constant rate vertical fracture elliptical system elliptical flow Transient Flow...

.... Society of Petroleum Engineers drillstem/well testing constant mass rate flow capacity fluid property Artificial Intelligence Van Everdingen diffusivity outer boundary Trans Drillstem Testing compressibility deviation Raghavan graph Upstream Oil & Gas reservoir equation straight...

... behavior. Such a description is provided by the functions obtained by van Everdingen and Hurst for homogeneous and isotropic reservoirs. This method uses one set of values of permeability, porosity, and compressibility, and usually requires some history matching or curve fitting for determining the best...

... correlated with the conventional van Everdingen and Hurst solutions. It also has been shown that the solutions can be correlated with the transient drainage concept introduced by Aronofsky and Jenkins, even though no theoretical basis exists whereby their validity can be proved. In fact, the latter...

... is focused on timesshort enough for outer boundary effects not to befelt at the well. SPEJ p. 279 drillstem/well testing dimensionless time boundary condition Drillstem Testing approximation flow rate Van Everdingen skin effect Bessel function storage permeability wellbore storage Jaeger...

... of the productionhistory of certain reservoirs by this mechanism, fluid compressibility can beconsidered small and constant. Cumulative fluid produced by this means as afunction of time was calculated for a uniform reservoir by van Everdingen andHurst. 1 For certain cases where a production well has been damagedor where...

...-fitting computation was proposed by van Everdingen, Timmerman and McMahon in 1953. We found that their method would not work when there is error in the reservoir pressure dataeven moderate error. The technique presented here appears to give reasonable answers when pressure data are uncertain to the degree...

... representation of water flow in the reservoir-aquifer system. The prediction of water movement requires selection of a flow model for the reservoir-aquifer system. A physically reasonable flow model treated in detail to date is the radial-flow model considered by van Everdingen and Hurst. In many cases...