These solution methods are essential for proper analysis of early-time data measured during a single-well pumping test. A recovery test measures the residual drawdown after an aquifer pumping test has ended and analyzes the recovery data to determine hydrogeological. The major disadvantage is the difficulty of maintaining a constant production rate. The main technical advantage of drawdown testing is the possibility for estimating reservoir volume. Early-time data show wellbore storage effect before derivative becomes constant (infinite-acting conditions). Properly run drawdown tests may provide information about formation permeability K, skin factor, S, and the reservoir volume communicating with the well. Analysis of drawdown and recovery data with derivative from a constant-rate single-well pumping test in a nonleaky confined aquifer. Single-Well Pumping Test With Wellbore StorageĪQTESOLV provides an unmatched number of solution methods for the analysis of single-well tests with wellbore storage. The natural water level in the aquifer depresses from the stress of the. AQTESOLV includes wellbore storage (finite-diameter well) solutions for confined, leaky confined, unconfined and fractured aquifers. Water well drawdown occurs during groundwater withdrawal through the well screen. Maximum drawdown generally occurs at the. That is, the rate at which the well production matches the pump rate because the water level is no longer falling. A pump test, also known as a well test or an aquifer test, provides valuable. The preventer may be a low-pressure sphcrical preventer or some type of diverter. Angles and bends should be minimized in the diveiter lines to avoid unnecessary restrictions. One important aspect of single-well tests is the effect of wellbore storage on early-time data. down test, where the sustained pump rate may be determined prior to the day of the pump test. 16-68 Typical diverter stack (Courtesy PennWell Publishing) The lines should be as large as possible with a suggested minimum ID of 6 in. Measure and record water drawdown levels and pumping discharge rate. Horne (1995) gives a comprehensive description of borehole storage phenomena for a pressure drawdown test: When the well is first open to flow, the pressure. AQTESOLV provides the same rich set of tools for analyzing single-well tests as multi-well tests. Before beginning any well yield pump test, the drillers well log must be reviewed. Analyzing a single-well test is no different than a test with observation wells. In a single-well test, drawdown measurements are obtained in the test (control) well. AQTESOLV contains a comprehensive suite of solution methods for analyzing single-well tests.
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