Tex. Educ. Code § 66.72
Each lease shall provide that in the event production of oil or gas on the leased premises, once obtained, shall cease for any cause within 60 days before the expiration of the primary term of the lease or at any time or times thereafter, the lease shall not terminate if the lessee commences additional drilling or reworking operations within 60 days thereafter, and the lease shall remain in full force and effect so long as such operations continue in good faith and in workmanlike manner, without interruptions, totalling more than 60 days during any one such operation; and if such drilling or reworking operations result in the production of oil and/or gas, the lease shall remain in full force and effect so long as oil or gas is produced therefrom in paying quantities or payment of shut-in gas well royalty or compensatory royalties is made as provided in this subchapter.
Tex. Educ. Code § 66.72