eur: EUR and time-to-limit for Arps decline curves In aRpsDCA: Arps Decline Curve Analysis in R

Description

Evaluate estimated ultimate recovery and time to economic limit for Arps decline curve objects.

Usage

 ```1 2``` ```arps.eur(decl, q.limit) arps.t.el(decl, q.limit) ```

Arguments

 `decl` an Arps decline object as returned by `arps.decline` or `curtail`. `q.limit` economic limit rate [volume / time] in same units as `decl`.

Value

`arps.eur` returns the total production for `decl` at the point in time when the economic limit `q.limit` is reached; that is, `arps.Np(decl, arps.t.el(decl, q.limit))`, in the same units as `q.limit`.

`arps.t.el` returns the time until the economic limit `q.limit` is reached for decline `decl`.

`arps`, `curtail`.

Examples

 ``` 1 2 3 4 5 6 7 8 9 10 11 12 13``` ```## exponential decline with ## qi = 1000 Mscf/d, Di = 95% effective / year ## EUR with economic limit 10 Mscf/d decline <- arps.decline(1000, as.nominal(0.95, from.period="year", to.period="day")) arps.eur(decline, 10) ## hyperbolic decline with ## qi = 500 bopd, Di = 3.91 nominal / year, b = 1.5, ## time to reach economic limit of 3 bopd decline <- arps.decline(rescale.by.time(500, from="day", to="year"), 3.91, 1.5) arps.t.el(decline, rescale.by.time(3, from="day", to="year")) ```

Example output

```[1] 120704.2
[1] 366.6935
```

aRpsDCA documentation built on July 24, 2017, 1:03 a.m.