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Calcimator

Well Spacing Calculator

Calculate optimal well spacing from drainage radius.

Inputs

ft
acres
%
$
bbl
$/bbl

Results

Maximum Wells

5

Well Spacing

113 acres

≈ 23 city blocks

Well Spacing2,220 ft
Drainage/Well126 acres
Net Revenue$50,000,000.00
How to Use This Calculator
  1. Enter reservoir drainage area per well (acres), section size (acres), and minimum setback from lease lines (ft).
  2. Enter well pattern type (square, staggered, or irregular) and number of zones.
  3. Read optimal well count per section and recommended spacing (ft or acres per well).
  4. Review interference risk based on drainage radius overlap.
  5. Compare spacing scenarios against offset analog production data for calibration.

How the result changes with Drainage Radius

Drainage RadiusMaximum WellsWell Spacing
5902823 acres
1,8152214 acres
3,2850700 acres
4,51001,320 acres

What each input means

Drainage Radius
Effective drainage radius of each well.
Section Area
Total area available for drilling (640 = 1 section).
Drainage Overlap
Percentage of drainage area overlap between wells.
Well Cost
Total cost to drill and complete each well.
Estimated EUR/Well
Estimated ultimate recovery per well in barrels.
Oil Price
Expected oil price per barrel.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Drainage Radius = 1320, Section Area = 640, Drainage Overlap = 10, Well Cost = 5000000 = 6 input(s) provided
  2. Calculate Maximum Wells
    Maximum Wells
    5 = 5
  3. Calculate Well Spacing
    Well Spacing
    113 = 113
  4. Calculate Well Spacing
    Well Spacing
    2220 = 2220
  5. Calculate Drainage/Well
    Drainage/Well
    126 = 126

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