19.—(1) Where an operation to which this paragraph applies is being carried out on a well the well-operator shall cause to be sent to the Executive, at such intervals as may be agreed or, failing agreement, at intervals of one week calculated from its commencement, a report comprising the following information—
(a)the identifying number, and any slot number, of the well;
(b)the name of any installation or vessel involved;
(c)a summary of the activity in the course of the operation since its commencement, or the previous report;
(d)the diameter and true vertical and measured depths of—
(i)any hole drilled; and
(ii)any casing installed;
(e)the drilling fluid density immediately before making the report; and
(f)in the case of an existing well, its current operational state.
(2) Paragraph (1) applies to—
(a)a drilling operation;
(b)a workover operation;
(c)an abandonment operation;
(d)an operation consisting in the completion of a well;
(e)any other operation of a kind involving substantial risk of the unplanned escape of fluids from a well.