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QatarEnergy has selected contractors for the two main engineering, procurement and construction (EPC) packages of its estimated $4bn-$5bn Maydan Mahzam offshore oil field expansion project in Qatar.

The Qatari energy giant has selected a consortium of state-owned PetroVietnam Technical Services Corporation (PTSC) and Singapore-based Seatrium for package 1 of the Maydan Mahzam field expansion project, according to sources.

State-owned China Offshore Oil Engineering Company (COOEC) has secured package 2 of the project, sources told MEED.

Additionally, PTSC has confirmed its contract award for the first engineering, procurement, construction and installation (EPCI) package in a disclosure to the Hanoi Stock Exchange, saying its wholly owned subsidiary PTSC Mechanical & Construction had received a letter of award from QatarEnergy. The company added that “the parties will continue discussions to finalise and execute the definitive contract, which is expected to be signed in October 2026”.

In its filing, PTSC added that its scope of work covers “the provision of engineering, procurement, construction, transportation, offshore installation, hook-up, commissioning and brownfield modification services for the [Maydan Mahzam] project”.

MEED reported in late August that the consortium of PTSC and Seatrium had emerged as the frontrunner for package one of the expansion project.

At the time, US-based McDermott was ahead in the race to win package two. However, COOEC is understood to have presented "better terms to the client in the final rounds of negotiations”, sources said.

QatarEnergy issued the main tender for the Maydan Mahzam oil field expansion project in February 2025, with EPC works divided into four packages, MEED previously reported.

Contractors submitted technical bids for the project’s two main EPC packages in September 2025, sources said.

After QatarEnergy granted several extensions to the deadline for the submission of commercial bids for the two packages – initially set for 1 March – contractors submitted their prices by 21 June, MEED reported.

The following contractors, among others, are understood to have submitted bids for the two main packages of the project:

Package 1:

• China Offshore Oil Engineering Company (China)
• Hanwha Ocean (South Korea)
• Hyundai Heavy Industries (South Korea)
• Larsen & Toubro Energy Hydrocarbon (India)
• PetroVietnam Technical Services Corporation (Vietnam) / Seatrium (Singapore)
• Saipem (Italy)

Package 2:

• Allseas (Netherlands)
• China Offshore Oil Engineering Company (China)
• Larsen & Toubro Energy Hydrocarbon (India)
• McDermott (US)
• Saipem (Italy)

The Maydan Mahzam oil field lies about 100 kilometres (km) northeast of the Qatari coastline and 28km southeast of Halul Island, located in water depths of about 40 metres. The field, together with the nearby Bul Hanine field, was discovered in the 1960s and has been in production since 1965.

QatarEnergy is undertaking the project to upgrade infrastructure at Maydan Mahzam to extend the life of this maturing asset and maintain productivity over the long term.

The scope of work for package 1 includes the EPC of seven new topsides, requiring the fabrication of structures weighing more than 78,000 metric tonnes in total. The main process topside will weigh 19,400 metric tonnes, while the other topsides will consist of 10-legged jackets.

The scope also includes modifications to five existing topsides, four new bridges, eight-tonne support platforms with jackets, brownfield work on Halul Island and the installation of pipelines and cables.

The scope of work for package 2 covers the EPCI of topsides, umbilicals and cables.

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In addition to advancing its gas production and liquefied natural gas ambitions, QatarEnergy committed significant capital expenditure last year to increasing oil output capacity from its offshore fields.

In August 2025, QatarEnergy selected contractors for the EPC works on a project to maintain and increase production potential at the Bul Hanine offshore oil field. The EPC scope was divided into three main packages, with COOEC being awarded the first two packages and Qatari contractor Doha Petroleum Construction Company (Dopet) being selected for the third. In addition, COOEC appointed US-based KBR to provide detailed engineering services for the first and second packages.

Separately, last September, QatarEnergy awarded the main EPC contract for a project to add a fifth natural gas liquids (NGL) train at its complex in Mesaieed Industrial City. Indian contractor Larsen & Toubro Energy Hydrocarbon won the contract.

The project, estimated to be worth $2.5bn, aims to build a fifth NGL train with the capacity to process up to 350 million cubic feet a day of rich associated gas from QatarEnergy’s offshore and onshore oil fields.

ALSO READ: Contractors prepare bids for North Field West offshore platforms

READ THE SEPTEMBER 2026 MEED BUSINESS REVIEW – click here to view PDF

Nuclear power ambitions gather pace; Kuwait keeps dealmaking alive despite war; Region invests in raising gas processing capacity.

Distributed to senior decision-makers in the region and around the world, the September 2026 edition of MEED Business Review includes: