prod_curve

prod_curve is an R function for calculating monthly production curves for individual oil wells using data that is typically reported by the oil industry.

Inputs

prod_curve accepts the following vectors of production data

• well_id: numbered ID's for individual wells
• prod_first_6: cumulative production during the well's first 6 months
• prod_first_12: cumulative production during the well's first 12 months
• prod_first_24: cumulative production during the well's first 24 months
• prod_first_60: cumulative production during the well's first 60 months
• prod_last_year: total production during the well's last recorded year
• prod_daily_last_year: average daily production during the well's last recorded year
• prod_cumulative: total cumulative production
• prod_peak_daily: peak daily production
• date_start: start date of the well's records. Must be in decimal form: 2012-03-01 = 2012.16
• date_end: end date of the well's records. Must be in decimal form: 2012-03-01 = 2012.16 date_end
• peak_month: month number of peak production. Example: if well peaked 20 months after the start of production, peak_month=20
• decline_3: the percentage decline in production 3 months after peak production
• decline_12: the percentage decline in production 3 months after peak production
• decline_24: the percentage decline in production 3 months after peak production
• decline_60: the percentage decline in production 3 months after peak production
• step_threshold: a fractional threshold to test for a step function in the production curve. If any change in cumulative production between time steps is greater than step_threshold*prod_cumulative, we estimate the production curve solely from cumulative production data.

For an example of this type of production data, see this github repo: https://github.com/magerton/drillinginfo-data-import

Output

prod_curve returns a list with estimated monthly production data for each well.

• well_id: a vector of well IDS
• production_month: a vector of production months for each well
• cumulative_production a vector of cumulative production for each well

Installation

To use prod_curve, install the following R packages:

• Rcpp
• RcppArmadillo
• BH

Put the source code (prod_curv.cpp) in the directory of your R script. Then source it with the command sourceCpp('prod_curv.cpp').