.... Viscoelastic surfactants are introduced because of their dual capability of lowering the IFT and improving the sweep efficiency of the reservoir. In this paper, the main objective is to determine ultralow IFT's and thermal stability that can be obtained from viscoelastic surfactants in the presence of heavy...

... 2 is proposed for condensate banking removal. Selection of the right surfactant, like alpha olefin sulfonates, which are thermally more stable than alkyl ether sulfates, is crucial while designing foam treatment, as they produce the most persistent foams at high salinity and elevated temperatures...

... of surfactant alternating with brine. The surfactant slug compositions are selected based on the rheological behavior of the microemulsion phase. The chemical slugs are configured such that the viscosity of the injected fluids is kept low to preserve injectivity and to ensure invasion of the conformance agent...

.... Modeling & Simulation concentration salinity enhanced recovery adsorption viscosity saturation chemical flooding methods polymer pore surfactant injection permeability distribution equation Upstream Oil & Gas Efficiency polymer flooding SMA cumulative production comparison...

... bridge the reservoir without invading the reservoir. This invasion of solid particles along with the filtrate entered into the formation later contributes to skin damage. Ordinary surfactants cannot able to remove this damage to larger extenet and hence specially deisgned surfatant system have been...

...) and water-based muds (WBM). This paper summarizes the lessons learnt from a laboratory NMR study of oil-based mud filtrate (OBMF) invasion as a function of rock mineralogy and microstructure, mud chemistry and displacement/flow pressure. In this work, we studied the effect of a commercial surfactant...

..., but it suffers from high mobility and gravity override results in lower ultimate recovery. The high mobility and gravity override can be minimized by generating the CO 2 foam with the aid of a surfactant. However, CO 2 is unable to generate the foam/stable foam above its supercritical point (1100 psi, 31°C...

..., the produced aqueous solutions from production wells are normally turbid or colored due to the presence of various surfactants and surfactant-solubilized crude oil. Besides, if high pH condition is encountered in the flooding process, the degree of hydrolysis of the polymer can increase, causing errors...

...Procedures Foam Stability Results: Screening and Optimization Seven different commercial surfactants described in methodology section were tested using FoamScan equipment and their performances were compared based on the half-life as a parameter for considering foam stability at high...

... Abstract The oil mobilization in tertiary mode using chemicals has been shown to be a promising approach. In such technique, surfactants with or without polymers, designed for specific reservoir conditions, are added into water during water flooding to further drive remaining oil out...

... The objective of this work is to investigate the effect of surfactant concentration, shear rate and injection quality on CO 2 -foam rheology. Four surfactants were used to evaluate the foam generation and rheological properties of CO 2 -foams at high pressure, temperature, and salinity. This work...

...Experimental Procedures Materials Abstract Chemical combination flooding technique (CCF) meets great technical challenges in High temperature, High salinity (HTHS) reservoir. The requirements on thermal stability, salt tolerance, solubility and interfacial activity of surfactant greatly...

... Abstract Presently, field application of Alkali-Surfactant-Polymer flooding (ASP) has achieved great technical success with incremental oil recovery more than 20%. The synergistic effects induced by the three components, alkali, surfactant, and polymer greatly activate remaining oil after water...

... Abstract Surfactant injection faces a great challenge due to severe conditions in the reservoir including high salinit y and temperature which results in surfactant precipitation and/or surfactant degradation. Considering the local reservoirs conditions, a surfactant which is stable under harsh...

... Eq. 1 N c = u μ σ Where u is fluid velocity, μ is viscosity and σ is interfacial tension. Abstract Surfactant addition could improve oil recovery of water flooding in mixed-wet/oil-wet naturally fractured reservoirs by changing wettability or reducing water/oil...

... of emulsions which can be used to control CO 2 mobility and, therefore, improve sweep efficiency. enhanced recovery emulsion particle chemical flooding methods concentration silica 3 salinity stability Upstream Oil & Gas NP concentration silica 2 surfactant nanoparticle emulsion...

... polymer fluorinated surfactant application enhanced recovery Brine amphoteric surfactant chemical flooding methods adsorption thermal stability fluorinated amphoteric surfactant Upstream Oil & Gas concentration zwitterionic surfactant surfactant muhammad shahzad synthetic...

... Abstract This work investigated experimentally the potential of the mixture of two anionic surfactants to reduce the mobility and enhance the oil recovery by generating stronger foam than that of the individual surfactants. Foams of the Alcohol Alkoxy Sulfate (AAS), Internal Olefin Sulfonate...

... mobility of water and gas. Therefore, there is an underlying need for improving recovery through a suitable chemical enhanced oil recovery (EOR) method. After investigating the feasibility of alkaline, polymer, surfactant, surfactant-polymer, alkaline-polymer and alkaline-surfactant-polymer (ASP) flood...

... Abstract Due to the favorable properties and versatility, the applications of ionic liquids (ILs) have been introduced in petroleum industry for different purposes including Enhanced Oil Recovery (EOR) processes. The ability of ILs to alter surface behavior of surfactant molecules by producing...