Abu Dhabi Company for Onshore Petroleum Operations (Adco) has invited companies to submit bids for the project to expand oil production at the onshore Qusahwira field.

Prequalified companies have been given a deadline of 18 July to submit technical bids for the engineering, procurement and construction (EPC) work on the second-phase development of the field, according to sources familiar with the scheme.

Project owner Adco cancelled a previous tender last year, having received technical EPC bids in June 2015, and is thought to have revised the scope of the scheme.

Under the new tender, the project is estimated to be valued at between $500m and $600m.

Adco will set a date for companies to submit prices after technical bids have been submitted and assessed.

Phase two of the Qusahwira field development is part of Adco’s programme to increase the capacity of its onshore South East Asset fields, which also includes projects at the Sahil and Mender fields.

Under the original scope, the expansion was expected to add 25,000 barrels a day (b/d) of new capacity at the field, which is located 260 kilometres south of Abu Dhabi city.

Canada’s SNC-Lavalin carried out the original front-end engineering and design (feed) study for the project.