Coring Cost

Not Reviewed
Equation / Last modified by KurtHeckman on 2018/10/15 02:13
`C_c = `
EdwardOmbui.Coring Cost

The Cost of Bore Drilling calculator computes the cost per unit length for a core drilled and recovered.

INSTRUCTIONS: Choose units and enter the following:

  • (Cb) This is the cost of core bit
  • (Cs) This is the cost of coring service from a service company
  • (Cr,) This is the rig day rate
  • (tt) This is the trip time
  • (tc,) This is the core recovering time
  • (trc) This is the core barrel handling time
  • (L) This is the length of core recovered
  • (Rc)  This is the percentage of core recover

Cost Per unit Length(Cc): The calculator returns the cost in U.S. dollars per foot.  However this can be automatically converted to compatible units (e.g. Euro/meter) via the pull-down menu.

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The Math / Science

The formula to compute the cost per length recovered in a bore rock drill in the well is:

    `C_c = ((C_b+C_s+C_r*(T_t+T_c+T_(rc)))/L)*  1/(R_c)`


  • Cc = coring cost per foot
  • Cb = cost of core bit
  • Cs = cost of coring service from a service company
  • Cr = rig day rate
  • tt = trip time
  • tc = core recovering time
  • trc = core barrel handling time
  • L = length of core recovered
  • Rc = percentage of core recover


Figure 1: Coring cost equation