California Code, Code of Civil Procedure - CCP § 772.040

(a) The document that created the leasehold interest was originally executed more than 20 years prior to filing the action under this article regardless of any amendments to the document. However, if any amendment was entered into expressly for the purpose of waiving, limiting, or rearranging surface rights of entry and occupation by the lessee, the 20-year period shall be computed as if the document were originally executed on the date of execution of the amendment.

(b) The subject land is not presently occupied by any of the following:

(c) Termination of the right of entry or occupation within the subject land in the manner requested by the plaintiff, or subject to such conditions as the court may impose pursuant to this section, will not significantly interfere with the right of the lessee, under the lease, to continue to conduct operations for the continued production of oil from leasehold strata beneath the surface zone in a practical and economic manner, utilizing such production techniques as will be appropriate to the leasehold area, consistent with good oilfield practice, and to gather, transport, and market the oil.