An integrated hydraulic fracturing followed by waterflooding was conducted in a heterogeneous sandstone formation the Northern Shanxi Slop of Ordos Basin Western China. Water breakthrough quickly occurred, and underlying mechanism water has not been well understood. Such needs to be investigated comprehensively from spatial connectivity multilayer sand bodies characterization hydraulic-natural ...

Waterflooding is widely implemented to enhance oil recovery. The displacement efficiency of this method depends on multiple factors, including makeup water properties, native oil, and formation rock. incompatibility the injected fluid with pore can result in a chemical non-equilibrium state within porous media that may different reactions depend type number existing components system. present r...

In this work, polymeric materials designed for enhanced oil recovery (EOR) were evaluated their intended application. Properties including viscosity, flow through porous media (resistance factor and residual resistance factor), heavy displacement (incremental recovery) assessed terpolymers of 2-acrylamido-2-methylpropane sulphonic acid (AMPS), acrylamide (AAm), acrylic (AAc). The same propertie...

Due to the long-term fluid-solid interactions in waterflooding, the tremendous variation of oil reservoir formation parameters will lead to the widespread evolution of preferential flow paths, thereby preventing the further enhancement of recovery efficiency because of unstable fingering and premature breakthrough. To improve oil recovery, the characterization of preferential flow paths is esse...

In the waterflooding development of fractured ultra-low permeability reservoirs, heterogeneity is becoming increasingly serious. The large fracture channels leads to serious water channelling and low recovery, effect conventional profile control not ideal. This paper proposed gel foam composite flooding technology solve above problems. Herein, new intelligent foaming agent systems were optimize...

Waterflooding remains the most commonly used method to improve oil recovery. Although injected brine type is mainly dependent on its availability, few of characteristics can be controlled during project design. Published laboratory work indicates that adjustment composition cause an increase in production by wettability alteration. This research objective propose a novel four-step framework for...

Carbonate reservoirs usually have strong heterogeneity, with complex pore structure and well-developed natural fractures. During reservoir development, when the formation pressure is lower than bubble point of crude oil, fluid undergoes phase change degassing. This leads to subsequent waterflooding displacement under oil–gas two-phase condition, also followed by a secondary oil gas caused incre...