Abu Dhabi’s National Oil Company (Adnoc) subsidiary Adnoc Onshore has extended the bid deadline for two packages of its project known as New Tie-In Southeast, according to industry sources.

The new bid submission deadline for the engineering, procurement, and construction (EPC) contracts is 4 February.

The previous deadline of 21 January was announced earlier this month when the packages were retendered.

“It’s still going to be tough to hit the new deadline,” one source said. “Preparing this new bid is consuming a lot of resources for many contractors.”

One of the packages, known as Package C, is estimated to be worth $200m. It includes the supply and installation of new manifolds as well as tying-in existing wells at the Asab and Sahil fields.

The second package is known as Package D and is estimated to be worth $300m. It includes the supply and installation of new manifolds as well as tying-in existing wells at the Shah, Qusahwira, and Mender fields.

Bids were originally submitted for these packages on 14 March 2017.

It is not known exactly why Adnoc Onshore decided to retender the contracts.

The New Tie-In Southeast project is made up of four separate packages, two of which are already under execution.

The first two packages of the New Tie-In Southeast project were awarded in October 2015.

The contract for Package A was worth $120m and was awarded to the UAE-based EPC contractor Al-Asab.

The contract for Package B was worth $170m and was awarded to the Pakistani multinational company Descon Engineering.

Package B is expected to be completed in April this year.

In November 2017 Adnoc announced it was planning to invest more than $100bn in its upstream and downstream businesses over five years.