Okla. Stat. tit. 21, § 436

Any prisoner confined in any other prison than the penitentiary, who attempts by force or fraud, although unsuccessfully, to escape therefrom, is guilty of a Class D2 felony offense punishable by imprisonment in a county jail not exceeding one (1) year, to commence from the expiration of the original term of his imprisonment. Any subsequent conviction pursuant to this section shall be a Class D2 felony offense, punishable by imprisonment as provided for in subsection C of Section 20O of this title.