# Coring Cost

Not Reviewed
C_c =
Tags:
Rating
ID
EdwardOmbui.Coring Cost
UUID
fcbcf1b3-3802-11e4-b7aa-bc764e2038f2

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.

#### 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:

• 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