Assessment of Pilot Water Shut Off in High Water Production Wells: Case Study in Sudan

A severe problem in oil-producing reservoirs is water production. Some reservoirs naturally more likely to face it, fluids tend to flow in least resistance which, are often created by the heterogeneous nature of the rock. Although reservoirs that supported by active bottom water drive and the Oil Water Contact (OWC) moved up to touch the bottom of oil column resulting in high water production. The water should be controlled in order to sustain the oil rate. Chemical water shut-off is a technology which has been used to control excessive water production. Producing Well- 4 with high water cut, 94.5% average W/C pilot project of chemical water shut–off using Akron-RK technology, which based on polymer effect to gelling the water, is deployed. Liquid rate decreased from 10,700 to 3,000 bbl /day. Water cut did not drop even when the Electrical Submersible Pump (ESP) ran at low and different frequencies. Analysis the water production and comparing with previous water trend behavior shows there is no change in production trend. Heterogeneity effect on chemical water shut off project must take more sensitive factors to ensure the success of the project. Suggesting that there is possibility, of high vertical permeability which cause re assessment of isotropy factor.