RRC sets field rules for spacing of wells from lease lines. RRC website online has link to field rules across the state. There are also density rules, so a larger acreage unit can have multiple wells. The unit may be a pooled unit of multiple smaller tracts or it could be a lease unit if everyone owns a percentage within the same tract. Look at the plat and related documents for both completion report and the permit. The plats could vary. Look at the recorded DPU in deed records if it is a pooled unit.