Tex. Nat. Res. Code § 91.107
If an active or inactive well is transferred, sold, or assigned by its operator, the commission shall require the party acquiring the well to file a new bond, letter of credit, or cash deposit as provided by Section 91.104(b), and the financial security of the prior operator shall continue to be required and to remain in effect, and the commission may not approve the transfer of operatorship, until the new bond, letter of credit, or cash deposit is provided or the commission determines that the bond, letter of credit, or cash deposit previously submitted to the commission by the person acquiring the well complies with this subchapter. A transfer of a well from one entity to another entity under common ownership is a transfer for purposes of this section. This section does not apply to a well bore that is included in a well-specific plugging insurance policy described by Section 91.104(c).
Tex. Nat. Res. Code § 91.107