...Advantages of high pH Alkali effect and the selection ASP flooding was developed on the basis of alkali flooding, polymer flooding and surfactant flooding, and has the advantages that the above three single chemical flooding do not have, that is, the synergistic mechanism, especially...

...Introduction Abstract The goal of this work is to develop alkaline-surfactant-polymer (ASP) formulations for a shallow, clayey sandstone reservoir. Commercially available surfactants were used in the phase behavior study. The gas-oil-ratio (GOR) was low; the phase behavior and coreflood...

... Abstract Surfactant flooding is a promising technique that can reduce interfacial tension (IFT) between oil and water to ultra-low values, mobilizing previously trapped oil. For reservoirs at moderate to high pressures, understanding and modeling how pressure affects the phase behavior...

... Abstract Low recovery of fracturing water is partly due to fracturing fluid leak-off into formation and water trapping in matrix. In our previous studies ( Soleiman Asl et al. 2019 and Yuan et al. 2019 ), we showed that using surfactant solutions in fracturing fluid can significantly enhance...

... Abstract In a surfactant-alternating-gas (SAG) injection, stable foams form viscous barriers and divert fluids, thereby providing conformance for enhanced oil recovery (EOR). Once foam decays, injected gas resumes preferential flow through thief zones, demonstrating the need for higher foam...

...Low adsorption to reservoir rock One of the most important characteristics of the new surfactant chemistry is the low adsorption rate to reservoir rock. This low adsorption rate creates a stronger foam capable of propagating deep into the reservoir and improving overall project economics...

... Abstract Chemical Enhanced Oil Recovery (EOR) methods have been implemented in a West Texas fractured carbonate. Due to the partially oil-wet nature of Yates field and slightly viscous oil (5-7 cP), surfactant injection was implemented to alter wettability and polymer was injected...

... permeability. This study aims to enhance oil recovery from tight carbonates by virtue of wettability alteration using surfactants. Twenty different surfactants of different classes and different functional groups are systematically evaluated by first testing their aqueous stability at reservoir conditions...

... were run with various ingredients, including brine only, brine plus surfactant, brine plus urea and ternary mixture of brine/surfactant/urea. In addition, the extraction experiments were tested at below and above MMP conditions to decipher the principal recovery mechanism. Based on our preliminary...

... implementation saturation injection upstream oil & gas slug size injection distribution pilot area throughput rate reservoir simulation foam quality drillstem/well testing concentration producer surfactant foam injection Introduction CO 2 injection is an efficient method to improve oil...

... Abstract Wettability Alteration (WA) as an Enhanced Oil Recovery (EOR) technique is screened for an oil wet carbonate offshore reservoir in this study. Surfactants can be used to change the rock wettability from oil-wet to water-wet conditions and can lead to unlocking significant incremental...

... Since almost a decade ago, foam technology based on the Surfactant Alternating Gas (SAG) technique was developed and implemented in most of the Piedemonte fields (Cusiana [ 4 ], Cupiagua in Recetor [ 5 ], Floreña, and Pauto Complex [ 6 ]) to get a better gas injection conformance both...

... Anionic surfactants have negatively charged head and positively charged tail. They are the most common types of surfactants since they are the cheapest types of surfactants. When the surface of the charge is also negative, as in the case of sandstones, the surface adsorption will be reduced...

... are absent in the more realistic DFN. Abstract Pilot tests of surfactant additives in completion fluid and gas huff n' puff in depleted wells have proven the possibility of production enhancement in unconventional liquid reservoirs (ULR). However, numerical simulation studies regarding EOR techniques...

... flow in porous media chemical flooding methods shale gas enhanced recovery complex reservoir waterflooding upstream oil & gas case 2 initial water water saturation water imbibition surfactant injection fluid dynamics experiment core piece shale oil oil shale brine...

... Table 2 Brine formulation 2 Ionic species ppm Monovalent Cation ~36,000 Divalent Cation ~1,700 TDS ~95,500 A surfactant formulation consisting of IOS and AEC combination was developed at 95°C to achieved optimum salinity of ~75,000 ppm using 2X synthetic brine #1...

... a formulation consisting of 2% sodium carbonate, 0.3% surfactant, and 0.27% polymer. Marmul crude oil has a high total acid number (TAN = 0.9 mg KOH/ml). The petroleum acids are neutralized by alkali to form soaps which mix with the added surfactant to generate low interfacial tension (IFT) between oil...

... process storage tank bottle test surfactant separation stability oil water separation phase quality Introduction Primary and secondary recovery techniques together are able to recover only in average 35 % of the oil in place. Since there is a significant amount of oil remaining...

... Extensive laboratory design and testing were performed to reduce the risk of pilot test. Screening tests are described including interfacial tension, phase behavior, viscosity, adsorption, wettability and core floods. Abstract The first pilot test of surfactant-polymer (SP) flood...

... Abstract Large hydrophobe Carboxylate surfactants (MW above 1000) are a relatively new class of surfactants developed for surfactant flooding during chemical enhanced oil recovery (EOR) processes. The presence of carboxylate groups and alkoxylate groups in the molecules provides stability...