Tex. Natural Resources Code § 102.012: OWNERS AUTHORIZED TO APPLY FOR POOLING.

The following interested owners may apply to the commission for the pooling of mineral interests:

(1) the owner of any interest in oil and gas in an existing proration unit or with respect to a proposed unit;

(2) the owner of any working interest; or

(3) any owner of an unleased tract other than a royalty owner.

Acts 1977, 65th Leg., p. 2571, ch. 871, art. I, Sec. 1, eff. Sept. 1, 1977.