Okla. Stat. tit. 20, § 1008

In each county of this state, the court clerk is hereby authorized to destroy, from time to time, depositions taken in all civil cases and domestic cases in which no minor child is involved, except adoptions, after a ten-year period, and depositions taken in domestic relations cases in which a minor child is involved may be destroyed after a twenty-year period has elapsed since any pleading has been filed or any action taken in the case.