Cal. Pub. Res. Code § 3735

Upon the completion or abandonment of any well or upon the suspension of operations upon any well, true copies of the log, core record, history, and, if made, true copies of all electrical, physical, or chemical logs, tests, or surveys, in duplicate and in such form as the supervisor may direct, shall be filed with the district deputy within 60 days after such completion or abandonment. Like copies shall be filed upon the recompletion of any well.