First Time Application of Stand Alone Screens with Sliding Sleeves in the Giant Mangala Field, Rajasthan India

摘要

This paper describes the first time selection and successful application of Sliding Sleeve Sand Screens in the open hole completions of the giant Ma ngala field situated in the Barmer Basin in Rajasthan, India which holds ~1.2 billion barrels (bbls) of oil in place. The field is a multilayer reservoir and has waxy viscous crude with in-situ oil vi scosity up to 17 cp. The f ield is being developed with a hot water flood for pressure maintenance and reservoir sweep. Significant production challenges include; an unfavourable mobility ratio, early water cut, sand production and high pour point. Production well completions with sand screens with sliding sleeves play an im portant role in t he field development, providing a very flexible tool to manage production from individual sand units coupled with open hole sand control. The screens are installed as an open hole completion and swellable element packers provide annular flow control. Intervention costs are kept low, as the field is onshore and the opening / closing of the sliding sleeves are done with relatively cheap onshore well intervention via slickline. Active reservoir surveillance and management in Mangala field will play a key part in maximising reserves and production rates from the field. Sliding sleeve sand screens are an appropriate technology for the Mangala field oil wells. These screens provide options for downhole water control across the formation thus increasing well life and reducing water handling at surface. This paper describes the design and implementation of these completions and how the completions provide optimum reservoir management capability for the Mangala field.