Feasibility Study of commingled steam injection for heavy oil production in FNE Oil Fields

Abstract

Thermal methods are the most commonly used Enhanced Oil Recovery methods around the world, one of them is the cyclic steam stimulation process, which had been implemented in FNE field; the well HHH-61 and HHH-38. After the execution the well had low oil rate . Fula North East (FNE) Oilfield is geographically located in the southwest of Sudan, about 700 km from the capital, Khartoum. Bentiu reservoir is subdivided into four sand units named as B1a, B1b, B1c and B1d with barriers among those four units. Average net pay thickness of B reservoir is 30 to 40 m and average Net to Gross (NTG) is 0.8. Bentiu reservoir is the main hydrocarbon accumulation formation and 263 MMSTB OOIP with 17 API In this thesis a list of challenges has been recorded in Sudanese heavy oil field and evaluation of current development strategy was done in FNE field In addition to that a detailed analysis has been done to determine the effect of non uniform steam distribution in commingle well in FNE heavy oil production in HHH-61_inj and HHH-38 also It has been found that top layer get nearly 70% the assumed amount of steam furthermore optimizing of injection rate in HHH-61 well has been while in well HHH-38 the result found that the top layer in the third cycle get nearly 60% compared with designed . The study recommend to avoid steam injection in multi layers semi tenuously , unless using separate layer technology for injection/production from multi layers.