Track: Case Studies

Abstract

    FNE Oilfield is geographically located in the southwest of Sudan, about 700 km from the capital, Khartoum; structurally located in the northeast of Fula sub-basin of Muglad basin and in the southwest of the Moga Oilfield, and has a long narrow structure from northwest to southeast, the biggest length of northwest-southeast is about 10 km, the average width of northeast-south is about 1.5 Km. The field oil bearing area is around 12 Sq Km. The overall terrain in FNE Field is higher in the southwest and lower in the northeast

FNE Oilfield exploration began in 1989, the first well FNE-1 has been drilled in 2005, and then immediately the development and research began. The oilfield development Case was completed in May 2008 and concluded to go for thermal enhanced oil recovery, Cyclic Steam Stimulation (CSS) has been implemented in since 2010 currently about 80 wells under CSS, some of the wells reach the 6 cycle.

During steam injection the steam distribute non-uniform because of reservoir heterogeneity and effect of steam gravity segregation, the Productivity of upper zones is better than that is of bottom zones and layer with excellent productivity continued to be improved with cycles, while other zones tended to be worse, and the production has been affected by steam distribution and adsorption per layer.

In this paper the well selection, designing, Implementation of Separate Layer Steam Injection/ Production from Comingle layers, steam distribution and adsorption as well as production analysis before and after will be studied and analyzed.

The results show that the production performance of FNE-28 has been improved  the cumulative oil  production increased almost five times compared to last cycle and the cycle duration been extended for more than two years.