Ann: Currajong 1 Exploration Well - Operations Update, page-5

Buru Energy Limited (Buru Energy) provides the following update on operations at the
Currajong 1 exploration well.
Since the last report the well has been drilled ahead in 12¼ inch (311mm) hole from the
13⅜ inch (340mm) casing depth of 713 metres to the current measured depth of 1,952
metres.
The Ensign 963 drilling rig has performed well with minimal rig related downtime, however,
an issue with the intermediate 13⅜ inch casing string has caused a number of days delay to
drilling operations.
Operations related to the casing issue are planned to be completed shortly at which time a
decision will be made on whether to install the contingent 9⅝ inch casing string before drilling
ahead through the main objective section.

Techies please help to understand.