Studies On The Stabilization Of ASP Flood Produced By The N1FE Block ASP Flooding Field Trial

This paper aims at the extremely difficult oil-water separation of the ASP Flooding produced fluid by the N1FE Block field trial. By means of artificial produced liquid study on the influences of alkali, surfactants and polymer on the oil-water interfacial property and bulk phase rheology,the oil-water separation property and emulsification degree of ASP flooding produced liquid by the N1FE block ASP flooding field trial and the influences of alkali, surfactants,polymer and shearing on the emulsification degree and oil-water separation property and the influences of alkali, surfactants,polymer and oil field particles on oil droplet coalescence,.By colloid and interface science it reveals the stabilization of alkali system ASP flooding produced liquid by the N1FE Block field trial.This paper presents the following conclusions:(1) Dynamic oil-water interfacial tension decreases with surfactant and alkaline increase. Polymer affects dynamic oil-water interfacial tension little.(2) Superfluous negative charge is on the oil-water interface of ASP (alkali, surfactant, polymer) flooding produced liquid. Zeta potential will raise with the alkaline increase. Zeta potential will reduce with the surfactant increase. The Zeta potential content changes a little with the surfactant increase when the content of surfactant is beyond 200mg/L.(3) Surfactant and polymer affect oil droplet size much more notablely than alkali. Emulsification degree increases with surfactant increase on condition that there is no polymer and alkali; Oil droplet size decreases with polymer and alkali increase at the low content of surfactant; Oil droplet size decreases then increases with polymer and alkali increase at the high content of surfactant.(4) Quartzite and calcic smectite particles adsorb on the oil-water interface; Sodium smectite, kaoline and Orthoclase do not adsorb on the oil-water interface.(5) The stabilization mechanism of o/w ASP flooding produced liquid mainly includes:①High viscidity of concatenation state stabilization mechanism;②Pervasion double eletricity layer stabilization mechanism;③High emulsification degree stabilization mechanism;④Space station encumbrance stabilization mechanism;⑤Small density difference stabilization mechanism.