A Comparison Between Different Skin and Wellbore Storage Type-Curves for Early-Time Transient Analysis

What information can we get from pumping tests?-comparing pumping test configurations using sensitivity coefficients

“…To take such effects or disturbances into consideration, special solution can be used on the one hand (e.g. Papadopulos and Cooper, 1967;Gringarten et al, 1979). On the other hand, the use and analysis of late time drawdown data, i.e.…”

“…First, the drawdown measured in a pumping well may be influenced by wellbore storage since any well is of finite radius and thus has a certain intrinsic storage capacity. In time-drawdown curves, it can easily be determined whether the early-time drawdown data are dominated by well storage, since such a behavior will yield a line of unit slope in a log-log plot of time versus drawdown (Gringarten et al, 1979). Second, well loss has to be taken into account.…”

A density-diffusivity approach for the unsteady state analysis of natural gas reservoirs

“…Analytical solutions to these liquid equations are readily available in the form of type-curves, which have become one of the foundations of reservoir engineering analysis. Starting with the pioneering analytical solutions provided by Van Everdingen and Hurst (1949), the "liquid" pressure diffusivity equation have been extensively analyzed and solved for a myriad of reservoir models and boundary conditions for the case of oil systems, including the analysis of infinite-acting constant rate production in radial systems (Ramey, 1970;Gringarten et al, 1979;Bourdet et al, 1983a), hydraulic fractured wells (Cinco et al, 1978;Gringarten et al, 1974;Agarwal et al, 1979), naturally-fractured systems (Warren and Root, 1963;Bourdet et al, 1983b), horizontal wells (Giger et al, 1984;Odeh and Babu, 1990;Ozkan, 2001), among others. These applications have established the fundamental solutions to the "liquid" pressure diffusivity equation, and their results have been widely used in oil pressure transient analysis.…”

Analysis of Pressure Buildup Data Following a Short Flow Period

“…6 If we assume that m(p) can be replaced by P 2 , Eq. 9 becomes _ kh 2 2 PwD -(Pi -Pwj)' ............. (10) …”

“…This example is taken from Ref. 10. The procedure to convert the buildup data into equivalent drawdown data is outlined in Table 2.…”