Well Spacing Calculator

Drainage Radius determines how much reservoir area a single well can effectively drain -- a larger radius means each well claims more of the section for itself (via Well Drainage Acres), leaving less room for additional wells. So Maximum Wells decreases as Drainage Radius increases, holding Section Area and Drainage Overlap fixed, since the section fills up with fewer, wider-spaced wells.

Drainage Overlap represents the percentage of each well's circular drainage area that already overlaps with a neighboring well's drainage -- Effective Drainage per well is reduced by that percentage, on the reasoning that overlapping drainage isn't exclusive area a well needs entirely to itself. A higher overlap percentage shrinks the effective drainage per well, which lets Maximum Wells increase for the same Section Area and Drainage Radius.

No. Maximum Wells and Well Spacing are determined purely by the drainage geometry -- Drainage Radius, Section Area, and Drainage Overlap. Well Cost, Estimated EUR/Well, and Oil Price only feed into Net Revenue, an economic overlay on top of the well count, so changing the economics never changes how many wells the drainage geometry says the section can support.

Net Revenue is Maximum Wells multiplied by the estimated profit per well -- Estimated EUR/Well times Oil Price, minus Well Cost. It's a simplified economic estimate that assumes every well produces the same EUR at the same price and cost, and doesn't account for drilling schedule, financing, taxes, or production decline timing -- useful for a first-pass section economics check, not a substitute for a detailed reservoir-engineering model.