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DERIV: A Computer Program for Calculating Pressure Derivatives for Use in Hydraulic Test Analysis
Author(s) -
Spane F. A.,
Wurstner S. K.
Publication year - 1993
Publication title -
groundwater
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.84
H-Index - 94
eISSN - 1745-6584
pISSN - 0017-467X
DOI - 10.1111/j.1745-6584.1993.tb00855.x
Subject(s) - smoothing , logarithm , derivative (finance) , sensitivity (control systems) , slug test , time derivative , test data , mathematics , well test (oil and gas) , second derivative , computer science , mechanics , statistics , engineering , mathematical analysis , petroleum engineering , geotechnical engineering , physics , electronic engineering , financial economics , aquifer , economics , programming language , groundwater
Hydrologie test analysis based on the derivative of pressure (i.e., rate of pressure change) with respect to the natural logarithm of time has been shown to significantly improve the diagnostic and quantitative analysis of slug and constant‐rate pumping tests. The improvement in test analysis is attributed to the sensitivity of the derivative to small variations in the pressure change that occurs during testing, which would otherwise be less obvious with standard pressure change versus time analysis. The sensitivity of the pressure derivative to pressure change facilitates its use in identifying the effects of wellbore storage, boundaries, and establishment of radial flow conditions on the test. DERIV is a program for converting slug and pumping test data and associated type curves to derivative format. The program has features that permit the smoothing of noisy test data, accounts for pressure derivative end‐effects, and can be used to convert slug test data to equivalent pumping test responses. Test examples that demonstrate the use of pressure derivatives also are provided.