Abstract
With high GOR and sour gas in South Oman, re-injection schemes were considered for the recently discovered reservoirs of the Harweel Cluster in South Oman. With the light oil and very high pressure, re-injected associated gas is nearly miscible with the reservoir oils. A program of study was planned to coincide with further appraisal and bringing some of the reservoirs onto production. After five years of study and simultaneously three years of development and two years of production from a "Phase 1" project, a Phase 2 production and miscible gas injection development has been approved by shareholders and has started. The Phase 2 development is one of the largest petroleum development projects ever undertaken in Oman.
This paper describes the strategies employed by the team responsible for developing the reservoirs of the Harweel Cluster. The original vision has been bolstered by substantial near field discoveries during the last five years. The appraisal challenges, the emerging study results, and reservoir pressure and production performance have required only minor adjustment to the original development concept.
