Emulsified Polymer Gel Pickering Emulsion for Conformance Control:Emulsion Formulation,Stability and Coreflooding Investigation

摘要

The water production from the oil wells not only increases the per barrel oil production cost but also raisesenvironmental concerns.The use of conventional water shut-off techniques not only restricts the productionof water but also reduces the oil production.The use of emulsified polymer gel system presents an efficientway for conformance control in the oil reservoirs.The emulsified polymer gel system was designed insuch a way that it will separated into oleic and aqueous phase encountering higher reservoir temperature.The aqueous phase will become gel and provides the resistance towards the water flow whereas the oilphase will provide the passage to oil,towards the production well.In this research work,an emulsifiedpolymer gel system was developed having polyacrylamide and polyethylenimine as aqueous phase anddiesel as oleic phase.The organoclay Cloisite 20A was used as an emulsifier.The emulsified polymergel system was characterized by dilution test,microscopic analysis and gel strength code.The developedemulsified polymer gel was found to be water-in-oil emulsion system,which formed rigid gel(gel strengthgrade-I)under reservoir temperature conditions.The thermal stability of the emulsion system was testedat 105°C.The emulsion stability index of the emulsified gel system was also calculated.To check theeffectiveness of the developed emulsified gel system for conformance control,core-flooding experimentwas performed at 105 °C.During the core flooding experiment,the system provides desired resistance towater flow whereas allow the diesel oil to produce with ease.This indicates that the developed emulsifiedpolymer gel system is an effective conformance control system,which can be used in high temperaturereservoirs.This research work presents a core flooding experiment study,to evaluate the performance ofemulsified gel system(Pickering emulsion)for conformance control in high temperature reservoirs.