In f0nzie/rNodal: Oil and Gas Well Nodal Analysis for Production Petroleum Engineering

source("../R/HAGBR.R")

# high level function that should call with any VLP corr
run.vlp <- function(depth.wh = 0,         # depth at wellhead
                    depth.bh = 5000,      # depth at bottomhole
                    diam.in  = 1.995,     
                    GLR      = 75,        
                    liq.rt   = 758, 
                    wcut     = 0.10, 
                    thp      = 200,       # tubing head pressure
                    tht      = 80,        # tubing head temperature
                    bht      = 180,       # bottomhole temperature
                    gas.sg   = 0.7, 
                    API      = 40, 
                    wat.sg   = 1.05, 
                    oil.visc = 5,
                    ed       = 0.0006,    
                    if.tens  = 30,
                    segments = 30         # number of depth segments
                    ) {


  diam.ft <- diam.in / 12
  temp.grad <- (bht - tht) / depth.bh   # temperature gradient



  depths <- seq.int(from = depth.wh, to = depth.bh, length.out = 30)
  nRow   <- length(depths)

  p  <- thp
  t0 <- tht                  # initial temperature
  v = vector("list", nRow)

  for (i in seq_len(nRow)) {
    depth <- depths[i]              # current depth

    dL <- depths[i+1] - depths[i]   # dL = next depth - current depth
    t <- t0 + temp.grad * depth         # temperature at depth calculation
    #cat(t, dL, depth, "\n")
    v[[i]] <- list(depth = depth,
                   dL = dL,
                   t = t,
                   pres.iter = p)
    dp.dz = 0.5                           # remember to replace for the real one
    p <- p + dp.dz * dL

  }

  tbl <- data.table::rbindlist(v)     # add row to table

  hbg <- hagbr.guo(diam = diam.ft, wcut = wcut, liq.rt = liq.rt, GLR = GLR, 
              p = thp, t = tht, API = API, gas.sg = gas.sg, 
              wat.sg = wat.sg, oil.visc = oil.visc, if.tens = if.tens, 
              ed = ed)

  # out <- list(depths = depths,
  #             nRow = nRow,
  #             temp.grad = temp.grad)
  # 
  # return(out)

  #return(hbg)

  return(tbl)


}


# use this generic function to run any VLP correlation
run.vlp(depth.wh = 0, depth.bh = 9700, segments = 30)

f0nzie/rNodal documentation built on May 6, 2019, 10:14 a.m.