Cal. Code Regs. tit. 14 § 1744.3
The conductor (if drilled or jetted) and surface casings shall be cemented with sufficient cement to fill the annular space back to the ocean floor. The intermediate casing shall be cemented with sufficient cement to fill the annular space back to the ocean floor or at least 200 feet into the next larger string of pipe. The protective and production casings shall be cemented so that all fresh water zones, oil or gas zones, and abnormal pressure intervals are covered or isolated, and, in addition, a calculated volume sufficient to fill the annular space to at least 500 feet above cementing points, above oil or gas zones, and above abnormal pressure intervals not previously cased. When the cement behind casing is not returned to the ocean floor or through a lap, the amount of solid cement fill behind casing shall be determined by surveys acceptable to the Supervisor. If the annular space is not adequately cemented by the primary operation, the operator shall displace sufficient cement to fill the required annular space. Upon demonstrating shut-off above the zones to be produced or injected into as indicated under (f) above, the operator may continue with the approved operations.
Cal. Code Regs. Tit. 14, § 1744.3