There are 26 sedimentary basins in Asia divided into four categories on the basis of hydrocarbon prospectivity. A total of about 3.14 million square kilometres area is covered by these sedimentary basins which includes both onshore and offshore. One of the most prominent category-1 (commercially producing) basin of Asia is XXX basin with an estimated hydrocarbon potential of about 1130 million metric tonnes. It covers an area of 15000 square kilometres onshore and about 25000 square kilometrs offshore, upto a water depth of about 1000 m (National Data Repository, DGH-MoPNG, GOI). It is believed that Asia relies heavily on XXX Basin for its energy security. However, one of the major challenges being faced in the XXX Basin offshore field development is Flow Assurance. Since most of the fields offshore basin are in deepwater setting, high pressure and low temperature conditions aggravate flow assurance problems.
Flow assurance is identified as a significant deepwater offshore development challenges and hence has emerged as a prominent discipline in the oil and gas industry. There are several definitions of Flow Assurance, one of the most common of which is: Flow Assurance is the analysis of thermal, hydraulic and fluid related threats to flow and product quality and their mitigation using equipment, chemicals and procedure (Makogon T.Y., 2019). It can be understood as an all-encompassing holistic approach of fluid flow from the reservoir to point of sale with an integrated perspective of asset development. In simple terms flow assurance aims to ensure fluid flow irrespective of flow trajectory, fluid chemistry and environmental conditions (Brown L.D., 2002). It has become increasingly important in recent times as the industry has turned to deepwater resources for energy sources. There are multiple examples where the proper utilization of Flow Assurance technology has saved billions of dollars for oil and gas companies. Norske Shell saved approximately 30 billion NOK in the Troll field by resorting to direct electrical heating of produced fluids. The same was utilized by Italian company ENI for its Goliath development and by BP in its Skarv field (Makogon T.Y., 2019).
This paper describes a comprehensive workflow to identify and mitigate flow assurance risks for the deepwater block in XXX Basin.