Upstream operator Abu Dhabi Company for Onshore Petroleum Operations (Adco) has asked contractors to resubmit commercial bids for the engineering, procurement and construction (EPC) work on the $2bn Bab Integrated Facilities Expansion, one of the largest oil and gas projects in the emirate.

Contractors are now invited to submit revised offers by 8 August, according to sources familiar with the project.

Adco received initial commercial offers on 18 June.

The following groups are vying for the contract:

• China Petroleum Engineering & Construction Company (CPECC; China)
• JGC (Japan) / National Petroleum Construction Company (NPCC; UAE)
• Petrofac (UK)
• Saipem (Italy)
• SK Engineering & Construction (South Korea) / Intecsa (Spain)
• Tecnicas Reunidas (Spain)

Adco received technical bids for the EPC contract in March.

The scope of work involves installing new facilities at Adco’s Bab field, located 160 kilometres southwest of Abu Dhabi city. As part of the original scope, surface facilities would be delivered for the Thamama-A, Thamama-H and Thamama-B production zones to achieve a total sustainable oil production rate of 450,000 barrels a day (b/d).

Adco retendered the Bab Integrated Facilities Expansion scheme on 22 December, a year after cancelling a previous tender on the project. The new tender is thought to have a reduced scope of works and the estimated budget has been reduced from $3bn to about $2bn, sources told MEED.

Adco is a joint venture of Abu Dhabi National Oil Company (Adnoc) and six international oil companies. Adnoc this year completed the joint venture by awarding stakes to two Chinese companies.