Sec. 86.003.  DETERMINATION OF SEPARATE WELLS.  If oil or gas, or both, is produced through different strings of casing set in the same well bore, the inner string through which oil or gas, or both, is produced shall be regarded as one well, and each successive additional string of casing through which oil or gas, or both, is produced from a different producing horizon through the same well bore shall be regarded as another well.
Acts 1977, 65th Leg., p. 2532, ch. 871, art. I, Sec. 1, eff. Sept. 1, 1977.