decline_fit_param: Arps decline_fit object

In Rdca: DCA Tools for Decline Rate Analysis and EUR Forecast

Description

Create an object of class 'decline_fit'

Usage

decline_fit_param(
  input_unit = "Field",
  output_unit = "Field",
  fluid = "oil",
  model = "exponential",
  fit_data = "rate",
  prod_data,
  initial_param,
  lower = NULL,
  upper = NULL,
  control = NULL
)

Arguments

input_unit	a unit system for parameters, a character string either 'SI' or 'Field'
output_unit	a unit system for properties, a character string either 'SI' or 'Field'
fluid	fluid type, a character string either 'oil' or 'gas'
model	decline model, a character string. 'exponential', 'harmonic', 'hyperbolic', and 'modified_hyperbolic' models are currently available
fit_data	a character string, either 'rate', or 'cum'
prod_data	a numeric vector of rates or cumulative according to 'fit_data'
initial_param	a numeric vector of initial estimates for the Arps decline model
lower	an optional numeric vector of lower bounds for the Arps decline model parameters. See 'minpack.lm' package for details
upper	an optional numeric vector of upper bounds for the Arps decline model parameters. See 'minpack.lm' package for details
control	an optional list of control settings. See 'minpack.lm' package for details

Value

a list of class 'decline_fit' with all the required parameters for the decline_fit() S3 methods

Examples

prod_data <- 3000 * exp(-0.00234 * c(1:300))
dcl_fit_param_exp <- decline_fit_param(input_unit = "Field", output_unit = "Field",
fluid = "oil", model = "exponential", fit_data = "rate", prod_data = prod_data,
initial_param = c(1000, 0.1, 0), lower = NULL, upper = NULL, control = NULL)

dcl_fit_param_exp

prod_data <- 4500 / (1 + 0.002 * 0.834 * c(1:400)) ^ (1 / 0.834)
dcl_fit_param_mod_hyp <- decline_fit_param(input_unit = "Field", output_unit = "Field",
fluid = "oil", model = "modified_hyperbolic", fit_data = "rate", prod_data = prod_data,
initial_param = c(10000, 0.1, 0.8, 0.01), lower = NULL,upper = NULL,
control = list(maxiter = 100))

dcl_fit_param_mod_hyp

Rdca documentation built on July 2, 2020, 3:59 a.m.