The Mangala oil field, discovered in 2004 is one of the largest onshore oilfields in India. The field is divided into five reservoir units and contains approximately 1.3 billion barrels of STOOIP. The field currently produces around 175,000 BOPD. The oil is highly viscous, with high paraffinic content, a high pour point, high Wax Appearance Temperature (WAT), as well as high wax dissolution temperature. In addition, high CO2 content, sand production and a high water cut are some of the other notable problems. Keeping this in mind, a combination of innovative technologies had been envisaged right from the development and appraisal stage of the field. The technologies used have been reviewed from a flow-assurance point of view and possible reasons for the selection of these techniques over other methods are also investigated and presented.

The waterfloods, EOR pilots, artificial lift systems as well as surface facilities have been designed and implemented keeping in mind the nature of the crude. From a flow assurance point of view, techniques such as hot water injection, coiled tubing heater string, jet pumps etc. have been used extensively. A 670 km long pipeline has been laid from the field to Bhogat in Gujarat for transporting the crude. This pipeline is the world's longest independent heated section pipeline and makes use of another innovation called Skin Effect Heat Management System (SEHMS). A careful examination of these techniques can help us gauge whether they can be put to use to handle similar crudes in other parts of the world.

This being a review paper, the working methodologies of flow assurance techniques used for the Mangala crude and the reasons for their success are studied.

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