L'estimation de l'efficacité des puits dans différentes conditions de débits de pompage suggère que la contribution de la perte de puits au rabattement total varie de 82 à 98% pour le puits D8 et de 95.5 à 99.93% pour le puits D10, selon les débits de pompage et les modèles appliqués. Les écarts entre les RMSE estimées des différents modèles ont tendance à augmenter avec des débits de pompage plus élevés, ce qui indique que l'hydraulique transitoire de perte de puits pourrait être importante pour estimer l'efficacité du puits, en particulier pour les puits de grande capacité. Les comparaisons entre les résultats des analyses des différents modèles ont montré que le modèle fournissait les plus petites erreurs quadratiques moyennes (RMSEs) entre les rabattements observés et simulés. ![]() La méthode proposée a été validée en la comparant à des modèles antérieurs et a été appliquée à deux puits de pompage pour l’alimentation publique en eau (puits D8 et D10) dans une région agricole de Sud Corée. Une équation pour représenter les pertes au puits pour un temps variable est proposée et formulée pour développer un modèle pour l’analyse des essais de rabattement par palier en régime transitoire. Une méthode est proposée pour analyser les données de rabattement par palier en régime transitoire en considérant l’hydraulique des pertes potentielles en puits. Un essai de rabattement par palier est un des essais de caractérisation d’aquifère les plus largement utilisés pour estimer le débit de rendement d’un puits et sa performance. It is concluded that the presented model showed improved efficiency in interpreting the step-drawdown test results by considering the contribution of the time-varying well loss under transient pumping conditions. Estimation of well efficiency under different pumping rate conditions suggests that the contribution of well loss to the total drawdown varies from 82 to 98% for well D8 and 95.5 to 99.93% for well D10, depending on the pumping rates and the applied models. The discrepancies between the estimated RMSEs of different models tend to increase under higher pumping rates, indicating that transient well-loss hydraulics could be important to estimate the well efficiency, particularly for high-capacity wells. Comparisons between the analysis results of different models showed that this model yielded the smallest root mean square errors (RMSEs) between the observed and simulated drawdowns. The suggested method was validated through comparisons with previous models and applied to two public-supply pumping wells (wells D8 and D10) in an agricultural region of South Korea. An equation to represent time-varying well loss is suggested and formulated to develop a model for the transient step-drawdown test analysis. A method is proposed for analyzing transient step-drawdown test data by considering potential transient well-loss hydraulics. This has been a major difficulty in analyzing a variable-rate pressure draw- down.A step-drawdown test is one of the most widely used aquifer tests to estimate the groundwater well yield and the well performance. Is left at the right side of the equation. This is so because for every t a variable factor 4 in its present form to construct a straight-line pressure drawdown plot, k, r, phi, mu, c and S must be known. Where S is the total flowing time for n constant-rate flow periods, t - t, t - t. ![]() van Everdingen introduced an additional term: If a condition of permeability damage or improvement exists, the equation must be corrected for these effects. ![]() 2 describes the pressure drawdown of a well where the formation around it is neither damaged nor improved. 1 isĪnd h is the net pay thickness in cm, q is the production rate in cc/sec, p is the original pressure at t = 0, p is the pressure at any t and r, and r, is the well radius. One of these is the so-called "point- source" solution, which approximates the case of an infinite oil reservoir with a well located at r = 0 and produced at a constant rate. Where r is the radial distance in cm, t is the time in seconds, p is the pressure at r and t in atmospheres, phi is the fractional porosity, mu is the viscosity in cp, c is the compressibility in vol/vol/atm, and k, is the permeability in darcies. The general equation used for describing the unsteady- state radial flow of slightly compressible fluids in homogeneous porous media can be written in cylindrical coordinates as
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