The move is part of the planned and phased transition announced in October 2016.
With a cargo carrying capacity of 210,150 cubic meters, Onaiza is wholly-owned by Nakilat and chartered by Qatargas.
The vessel, built in South Korea by Daewoo Shipbuilding and Marine Engineering, was delivered in April 2009 and has been in service ever since.
Onaiza is the seventh wholly-owned LNG vessel that will come under the management of Nakilat Shipping Qatar Ltd. (NSQL), bringing the total number of vessels managed by NSQL to 15, comprising of 11 LNG and 4 LPG carriers.
The management of a total of 25 LNG carriers, including fourteen Q-Max and eleven Q-Flex LNG carriers, will be transitioned from Shell to NSQL.