Excessive Water Production Diagnosis and Strategies Analysis

Abstract

Produced water is the water that extracted from the reservoir with the oil and gas, its complex subject and has serious economic and environmental impacts when the value of water oil ratio (WOR) exceeds the economic limit of the well. Jake oilfield is located in the northeastern part of Muglad basin in Sudan interior, trending northwest-southeast and covering 120, 000 km2. The field started production since 2010 and Water production increased rapidly throw the life of the field with a cumulative of 14 MMBBL by the end of 2014; with WOR is over 2.5 which increases the demand for creating a strategy to manage the field water situation This work diagnoses the reasons of excessive water production in Jake field and analyze the different strategies used to control the massive water production. The problems of excessive water production have been investigated, the production analysis which include Chan’s diagnostic was used to achieve proper diagnostic. The wells ranked according to a risk factor from 1 to 10 according to the selection criteria. High conductive channeling due to the edge water driver reservoir and the high permeability found to be the main reason; normal trends were observed in the watered out area wells. The surface facility, cost of produced water and the efficiency of the treatment system were investigated and the treatment cost of 1 Barrel of produced water have been calculated according to the world average. Three wells were selected for control options and further economic study depends on their risk factors. The three wells economic analysis shows that the value added form decreasing the water production could reach 39% of the total net present value of JS-02 and 15%, 10% for JS-08 andJS-24 respectively. Finally, this study showed that the total field management scenarios have to be integrated in a single strategy of decreasing the produced water to add more value from water treatment, decreasing the disposal which will cost less compared to the other costs. Two other wells can be transferred to injectors after further investigation and more well production methodology have to be optimized. Produced water Diagnostics and Strategies Analysis in Jake Field- Sudan -Case study