Hybrid analysis for excessive water production problem

Abstract

The production performance of wells should be studied in order to extend the production plateau period which can lead to an increase in revenue. The pool performance plot of a reservoir is a pictorial representation of the pressure-production history of a reservoir. Water-coning, near wellbore problem and multilayer channeling are the three basic mechanisms associated with high water-cut wells. Identification of the water sources is quite important to perform any remedial operation to extend oil production. This paper is a case study on the application of two methods to determine the accurate mechanism for high water-cut in an oil field ‘A’ of the upper Assam basin. Based on the study of conventional plotting of water-cut vs. time with well card data (History of all the jobs performed on the well) and log-log plots of WOR and WORꞌ vs. time, it was observed that the problems were due to multilayer channeling and coning. These plots show the problems associated with high water cut wells and they serve as an effective tool for the selection of water control treatment processes to enhance treatment. However, a failed treatment job will alter the conditions for the next job whereby the expenditure increases significantly.