decline_param: Arps decline object

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

Description

Create an object of class 'decline'

Usage

decline_param(
  input_unit = "Field",
  output_unit = "Field",
  fluid = "oil",
  model = "exponential",
  qi = NULL,
  Di = NULL,
  b = NULL,
  Dt = NULL,
  q_abnd = 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
qi	Arp's decline parameter, a numeric value. Depending on the 'input_unit', 'fluid' type, and also the decline_time() 'unit' parameter, it has different units. 'm3/day' for gas production in 'SI' unit with daily data, 'm3/month' for gas production in 'SI' unit with monthly data, 'MSCF/day' for gas production in 'Field' unit with daily data, 'MSCF/month' for gas production in 'Field' unit with monthly data, 'm3/day' for oil production in 'SI' unit with daily data, 'm3/month' for oil production in 'SI' unit with monthly data, 'bbl/day' for oil production in 'Field' unit with daily data, and 'bbl/month' for oil production in 'Field' unit with monthly data
Di	Arp's nominal decline parameter, a numeric value in '1/day', '1/month', or '1/year' depending on the decline_time() 'unit' parameter
b	Arp's decline parameter. It is zero for the 'exponential' model, one for the 'harmonic' model, and a value between zero and one for the 'hyperbolic' model. For unconventional reservoirs, b values more than one are also reported
Dt	Arp's "modified_hyperbolic" nominal terminal decline parameter, a numeric value in '1/day', '1/month', or '1/year' depending on the decline_time() 'unit' input
q_abnd	abandonment rate, a numeric value defaulted to NULL. If present, the model predicts the time to reach to the abandonment rate and also the estimated ultimate recovery (EUR) till the abandonment time. It has the same unit as 'qi'.

Value

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

Examples

decline_param_1 <- decline_param(input_unit = "Field", output_unit = "Field", fluid = "oil",
model = "exponential", qi = 1000, Di = 0.15, b = 0, q_abnd = NULL)

decline_param_1

decline_param_2 <- decline_param(input_unit = "Field", output_unit = "SI", fluid = "oil",
model = "hyperbolic", qi = 15000, Di = 0.1, b = 0.95, q_abnd = 200)

decline_param_2

decline_param_3 <- decline_param(input_unit = "Field", output_unit = "Field", fluid = "gas",
model = "modified_hyperbolic", qi = 100000, Di = 0.15, b = 0.85, Dt = 0.005, q_abnd = NULL)

decline_param_3

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