The CPC pipeline is a major oil export route for Kazakhstan, which – due mainly to rising production from the giant Chevron-led Tengiz oilfield – has been breaching export quotas within the OPEC+ producer group, which includes OPEC and Russia.
Other OPEC+ members, including Saudi Arabia, have also been pressing Kazakhstan to cut production to meet its quotas.
On Thursday, OPEC+ decided to raise output ahead of schedule, signalling the group was confident non-compliant members would reduce output in the coming weeks.
(Reporting by Vladimir Soldatkin; Editing by Jan Harvey, David Goodman and Louise Heavens)