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:

• (C_b) This is the cost of core bit
• (C_s) This is the cost of coring service from a service company
• (C_{r,) This is the rig day rate}
• (t_t) This is the trip time
• (t_{c,) This is the core recovering time}
• (t_rc) This is the core barrel handling time
• (L) This is the length of core recovered
• (R_c)  This is the percentage of core recover

Cost Per unit Length(C_c): 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.

Related Calculators

• Compute the Total Cost based on a Length or Distance and the Price per Unit Length or Distance

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)`

Where:

• C_c = coring cost per foot
• C_b = cost of core bit
• C_s = cost of coring service from a service company
• C_r = rig day rate
• t_t = trip time
• t_c = core recovering time
• t_rc = core barrel handling time
• L = length of core recovered
• R_c = percentage of core recover

Figure 1: Coring cost equation