A Reservoir Management Case Study of the Nahorkatiya Oilfield

Abstract

The Nahorkatiya oilfield had an initial stock tank oil in place of about 200 MMm and has been on production since 1953. The field is a structural-stratigraphic trap formed by block faulting resulting in a number of individual reservoir blocks of various sizes. The reservoir crude is saturated and combination drive with varying degree of aquifer support has been the primary drive mechanism. Pressure maintenance by gas and water injection and limited water/polymer flooding have been in operation in the major blocks. Overall field recovery is 31%, although in a few blocks recovery as high as 46% has been achieved through secondary recovery measures. This paper presents the reservoir management strategies undertaken at various stages of development to optimize production profiles and ultimate recovery. P. 569