Chemical ASP Design for a Sudanese Oil fields (case study Heglig main)

Abstract

Chemical Enhanced Oil Recovery (cEOR) can increase the recovery factor for many oilfields. in Heglig oilfield EOR method has been investigated on several levels in order to select the best application. The screening criteria of each method depend on the reservoir history (Moreno et al., 2014). Several EOR methods have been introduced including thermal EOR and non-thermal methods. Chemical enhanced oil recovery (CEOR) is a nonthermal method; it has shown high applicability in several conditions. Heglig main field is located at the southeast and middle of Block 2B, Muglad Basin, and it is one of the largest oilfields in Sudan, it has been producing oil since 1999, its oil production was reported to have peaked in 2006, and declined ever since. The field is composed of a sequence of massive and continuous sandstones interceded with shales. The most water production problems in Sudan were observed in this field, and the water cut has reached 95% with low recovery factor 22.2%. (29th DTR, GNPOC, 2012) This study aims to study the possibility of increasing the recovery factor by using chemical ASP injection for Heglig main oilfield. An ASP model was studied using a computer simulation software (computer modeling group CMG). Two mainly cases were implemented by using CMG simulator, the first case implemented by using two wells (HE-19 , HE-28) (base case), the second case which implement three wells (HE-19,HE-28,HE-INJ). The result show increasing in cumulative oil production by 9% and, decreasing in cumulative water production by 21% Pilot results has been set as matching results in order to further refine to the chemical EOR full-field model It is recommended to perform detailed studies to propose the optimum well locations, and the optimum perforations locations, and perform a detailed economical evaluation of the flooding processes