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Calcimator

Drilling Cost Calculator

Estimate per-foot and total drilling cost from rig rate and depth.

Inputs

ft
$/ft
$/day
ft/hr
hrs
$
$

Results

Total Drilling Cost

$1,112,500.00

≈ 3 average U.S. homes

All-in Cost/Foot

$111.25

≈ 7 movie tickets

Rig Cost$312,500.00
Drilling Days12.5 days
Drilling Hours200 hrs
How to Use This Calculator
  1. Enter total measured depth (ft), bit and service cost per foot ($/ft), and rig day rate ($/day).
  2. Enter average rate of penetration (ft/hr) and planned drilling days.
  3. Read total drilling cost ($) and cost per foot drilled.
  4. Review rig cost, bit/service cost, and AFE contingency breakdown.
  5. Compare AFE (authorization for expenditure) to actual cost drivers to identify overruns.

How the result changes with Total Depth

Total DepthTotal Drilling CostAll-in Cost/Foot
3,090$623,042.00$201.63
10,565$1,152,521.00$109.09
19,535$1,787,896.00$91.52
27,010$2,317,375.00$85.80

What each input means

Total Depth
Total measured depth of the well.
Bit & Service Cost/ft
Bit, directional, and service cost per foot.
Rig Day Rate
Daily rig rental rate.
Rate of Penetration
Average drilling rate of penetration.
Total Trip Time
Total hours for tripping pipe in and out.
Casing Cost
Total casing and cementing cost.
Drilling Fluid Cost
Total drilling mud and chemicals cost.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Total Depth = 10000, Bit & Service Cost/ft = 50, Rig Day Rate = 25000, Rate of Penetration = 50 = 7 input(s) provided
  2. Calculate Total Drilling Cost
    Total Drilling Cost
    1112500 = $1,112,500
  3. Calculate All-in Cost/Foot
    All-in Cost/Foot
    111.25 = $111.25
  4. Calculate Rig Cost
    Rig Cost
    312500 = $312,500
  5. Calculate Drilling Days
    Drilling Days
    12.5 = 12.5

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