Al Khafji Joint Operations, the operator of the oil field, is a partnership between Kuwait Gulf Oil Company and Aramco Gulf Operations Company.
Financial terms of the contract were not disclosed.
Under the contract, Mott MacDonald will be responsible for the provision of feasibility studies, preliminary engineering design, including papers and detailed design.
The consultancy will also offer technical support during tenders and develop front end engineering design for other industrial engineering projects.
Mott MacDonald project director Paul Looker said, "We look forward to providing innovative, effective solutions which will continue the success of the Khafji project."