(a) An oil, gas, and mineral lease executed by a guardian of an estate may be amended by an instrument that provides that a shut-in gas well on the land covered by the lease or on land pooled with all or part of the land covered by the lease continues the lease in effect after the lease's five-year primary term.
(b) The guardian of the estate, with court approval, shall execute the instrument according to the terms and conditions prescribed in the instrument.