Function to calculate the derivative of drawdown with respect to log of time of the Agarwal solution (skin and wellbore storage)
agarwal_skin_solution_dlogt(ptest, a, t0, sigma, t)
| ptest | A pumping_test object |
|---|---|
| a | Slope of the straight line fitted to the drawdown data using the Cooper-Jacob approach |
| t0 | Intercept of the straight line fitted to the drawdown data using the Cooper-Jacob approach |
| sigma | Value of the skin factor |
| t | Numeric vector with time |
A list with
x: time coordinates
y: Derivative value
Agarwal, R.; Al-Hussainy, R. & Ramey, H. An Investigation of Wellbore Storage and Skin Effect in Unsteady Liquid Flow: I. Analytical Treatment. Society of Petroleum Engineers Journal., 1970
Other agarwal_skin functions: agarwal_skin_WF_LT,
agarwal_skin_calculate_parameters,
agarwal_skin_solution_initial,
agarwal_skin_solution,
agarwal_skin_well_function
data(papadopulos_cooper)