... type chemical flooding methods pore imbibition enhancement mobilize wettability alteration journal surfactant zhou Introduction The complex pore-throat structure of the shale oil reservoir, characterized by extremely low porosity and permeability in tight formations ( Dong et al., 2023...

... from zeta potential measurements. The synergy between low-salinity water and surfactants yielded more than 40% oil recovery in spontaneous imbibition experiments. The addition of sulfate ions and weak acids improved spontaneous imbibition. The results of core flood tests underscored the efficacy...

.... EOR techniques have been proven to be technically feasible and to a certain degree, economically attractive. The techniques described in this paper are 1) gas injection in the huff n' puff mode 2) surfactant injection in the huff n' puff mode and 3) co- injection of both miscible gas and surfactant...

... Abstract Surfactants are widely applied agents to interact with the adsorbates on carbonate rock surface, which could alter wettability from oil-wetness to water-wetness and thus enhance oil recovery. Surfactant huff-puff is often conducted to achieve wettability alteration and has been applied...

... Abstract For a successful polymer EOR application, maintaining high polymer injectivity below fracture pressure is important to prevent fracture propagation in the reservoir causing fast breakthrough. Adding surfactant into the polymer system can facilitate the reduction of interfacial tension...

... imbibition is different during different EOR techniques, such as surfactant flooding, low salinity water injection, and hybrid methods. The effect of the type of capillary modifications on the imbibition rate was studied in this work. This study delves into a series of spontaneous imbibition tests aimed...

... Abstract One of the key components of surfactant related chemical EOR is the surfactant formulation package. After developing a surfactant formulation, delivering it to a target field and assuring similar or better performance is challenging. Since most surfactant formulations contain multiple...

.... Identification of breakers tailored for chemical stimulation/EOR efforts is therefore essential for successful improved oil recovery. In this study, liquid and easily available partitioning agents were tested as emulsion and foam breakers with selective surfactants mixtures. Water soluble partitioning agents...

... Abstract This investigation focuses on contrasting surfactant huff ‘n’ puff (HnP) treatments in two Eagle Ford Shale wells, specifically examining the influence of a polylactic acid (PLA) diverter used in the second. This work demonstrates surfactants as an effective enhanced oil recovery (EOR...

... polymer concentration pvee carbonate rock artificial intelligence polymer mmp surfactant pfa dilute concentration reduction pdm dissolution solubility Introduction Injection of carbon dioxide (CO 2 ) is an enhanced oil recovery (EOR) method, which is widely applied globally. Wide...

... Abstract Foam-assisted CO 2 mobility control can enhance CO 2 utilization and storage efficiency during enhanced oil recovery and carbon sequestration processes. CO 2 is typically injected at larger gas fractions (fg) to reduce the surfactant costs, which, however, may result in significant...

... and vaporization. Recently, surfactant-based enhanced oil recovery (EOR) is being considered for improving recovery in unconventional reservoirs. This study is a proof of concept of applying a combined surfactant and gas injection EOR to shale reservoirs. In this study, a combination of surfactant assisted...

..., surfactant chemistry selection, reservoir data analysis, and the experimental and modeling workflow for the optimal injection strategy, along with effective management of pilot operations, are discussed. A workflow for screening optimal surfactant formulation tailored specifically for the target field...

... Abstract This study investigates the use of binary surfactant systems for enhancing oil recovery (EOR) in carbonate formations, which have complex surface charges and harsh conditions (high temperature, high salinity) that limit the effectiveness of single surfactants. Binary surfactants form...

...-injection of CO 2 and a nonionic surfactant (CO 2 foam) solution with and without hydrolyzed polyacrylamide (HPAM) polymers was conducted, including one experiment adding chromium cross-linker solution to the surfactant-polymer solution, to assess gelation effects to assess the effects on improving CO 2...

... to confidently move forward with polymer projects where other chemical processes will be implemented in the future. Furthermore, a train of thought states it is deleterious to inject polymer in advance of a surfactant-based flood because viscous fluid ahead of surfactant could slow down chemical front...

... Abstract Demulsification of produced fluids in chemical flooding is a costive treatment due to the stable emulsion in the presence of injected surfactants. The objective of this study is to develop unique thermal stimuli-responsive surfactant, which reduces interfacial tension (IFT) at high...

... hydrocarbons by altering rock wettability and lowering interfacial tension (IFT). The surfactants also alter the relative permeability to a more favorable state in the propped fractures. This work describes a workflow to optimize treatment fluids for injection into shale and tight rock reservoirs. The workflow...

... Abstract Foam injection into naturally fractured reservoirs unequivocally has superior merits over pure gas injection. In this study, we present a novel foam generation strategy that incorporates the co-injection of surfactant and supercritical CO 2 with huff-n-puff technique for the efficient...

.... The majority of the bypassed oil is believed to be in the matrix. This paper describes a foam flood that has been implemented at Yates to sweep the bypassed oil in the matrix rock. Foam flooding in the Yates reservoir involves injecting a surfactant, along with the produced gas into the reservoir...