43 C.F.R. § 3262.12
Must I post a sign at every well?
Yes. Before you begin drilling a well, you must post a sign in a conspicuous place and keep it there throughout operations until the well site is reclaimed. Put the following information on the sign:
(a) The lessee or operator's name;
(b) Lease serial number;
(c) Well number; and
(d) Well location described by township, range, section, quarter-quarter section or lot.