Texas Natural Resources Code - NAT RES § 32.202. Pooling

(1) authority for pooling all of the leased area into units of no more than 160 acres for an oil well or 640 acres for a gas well plus a 10 percent tolerance or of a unit size allowed under or prescribed by rules of the Railroad Commission of Texas;

(2) that the production allocable to the state lease shall be based upon the surface acreage of the state lease included in the unit;

(3) that the unit operations, production from any portion of the unit or payment of shut-in gas well royalty on a lease or unit well shall be considered for all purposes to be the conduct of operations and production on the state lease;  and

(4) that neither unit production of oil or gas, nor unit operations, nor payment of shut-in royalties from a unit gas well, shall serve to hold the lease in force as to any area outside the unit, regardless of whether the production, maintenance of a shut-in gas well, or operations are actually located on the state tract or not.