Spacing Unit

A spacing unit, also called a drilling unit or drilling spacing unit, is the defined area of land that a state oil and gas regulator assigns to a well or group of wells. All of the mineral acreage inside the unit shares in the production from the unit’s wells, in proportion to how much of the unit each owner holds.

The size of a spacing unit is set by the regulator and varies by state, formation, and the type of well. Horizontal wells, which can run a mile or two underground, are typically assigned to larger units than old vertical wells were. A single horizontal unit often covers one or two square miles.

Spacing units matter to a mineral owner because they drive the math on a royalty check. Your share of a unit’s production is based on how many net mineral acres you own inside the unit, divided by the total acres in the unit, then multiplied by your royalty rate. That calculation produces your decimal interest, the number that appears on your division order.

Spacing units are also where pooling happens. To develop a unit, an operator needs the right to drill across all of the acreage in it. When some owners are unleased or do not consent, the operator may use the state’s force-pooling process to bring that acreage into the unit so development can proceed.

For inheritors, the spacing unit is a useful unit of understanding: rather than a single well “on your land,” your interest is usually a share of everything produced from a defined block of acreage. We are happy to help you work out how your acreage fits into a unit and what that means for what you receive, on a call or by email.