CHAPTER 4. Development, Regulation, and Conservation of Oil and Gas Resources Subchapter
1.Onshore Well Regulations
Article 3. Requirements
§ 1722.1.1. Well and Operator Identification.
(a) Each well location shall have posted in a conspicuous place a clearly visible, legible, permanently affixed sign with the name of the operator, name or number of the lease, and number of the well. These signs shall be maintained on the premises from the time drilling operations cease until the well is plugged and abandoned. (b) The appropriate Division district deputy may approve existing identification methods if they substantially comply with the intent of this section.
Subchapter 1.1 Offshore Well Regulations
Article 1. General
§ 1742. Well Identification.
(a) The number or designation, which includes the lease name when used, by which a well shall be known is subject to the approval of the Supervisor and shall not be changed without the written consent of the Supervisor.
(b) Identification of wells. The well designation shall be affixed to the wellhead or guard rail of each completed well. Wells completed from two or more zones shall have the zones individually identified at the wellhead. The Supervisor may approve existing well identification methods if they substantially comply with the intent of this section. Identifying signs shall be maintained in a legible condition.
(c) Platforms, islands, or other fixed structures shall be identified at two diagonal corners of the platform or structure by a sign with letters and figures not less than 12 inches in height with the following information: the platform or structure designation, the name of lease operator, and the lease designation. The Supervisor may approve abbreviations.
(d) Non-fixed platforms or structures shall be identified by two (2) signs with letters and figures not less than 12 inches in height affixed to opposite sides of the derrick to be visible from off the vessel with the following information: the name of the operator and the lease designation.
Source: https://www.conservation.ca.gov/index/Documents/CALGEM-SR-1%20Web%20Copy.pdf