Abstract
Adsorption of surfactants onto the surfaces during chemical flooding is a major problem in EOR and IOR process. This happens due to blockage of capillary pores and opposite charge on the surface. The objective of this paper is to reduce adsorption of anionic surfactants by application of no nonionic surfactants as an IOR process. The methodology for Selection of surfactants for core flooding has been done based on conductivity and emulsion tests. Nonionic surfactants Ethoxylated Alcohol (EO) of 1000ppm from emulsion test has been chosen to reduce adsorption of anionic surfactants Sodium Dodecyle Sulphate (SDS) of 750ppm determined from conductivity test. Core flooding experiment with anionic surfactants has been conducted with nonionic surfactants and without the influence of nonionic surfactants. Reduction in adsorption of anionic surfactants SDS up to 1.2 pore volume has been observed in the on core flooding experiment. Keywords: Adsorption, EOR, IOR, Nonionic Surfactants
Highlights
The ability of surfactants to alter properties at interface and surface has economical applications in oil and gas industry mainly on Enhanced Oil Recovery (EOR) and Improved Oil Recovery (IOR) methods[1].Additional technologies with EOR as IOR attained lot of attention since last decade
Adsorption of surfactants onto the surface of reservoirs has noticed to be a great problem for chemical EOR methods[2]
The concentrations for Sodium Dodecyle Sulphate (SDS) and Ethoxylated Alcohol (EO) were selected based on emulsion studies
Summary
The ability of surfactants to alter properties at interface and surface has economical applications in oil and gas industry mainly on Enhanced Oil Recovery (EOR) and Improved Oil Recovery (IOR) methods[1]. Additional technologies with EOR as IOR attained lot of attention since last decade. Adsorption of surfactants onto the surface of reservoirs has noticed to be a great problem for chemical EOR methods[2]. Adsorption is mainly dependent on hydrophobicity and salinity. Designing surfactants with less adsorption is being a great challenge to petroleum industry. Unswept oil could not be recovered effectively by surfactants because of adsorption. As much adsorption on surface, makes less contact with oil. Nonionic surfactants have been tested successfully on Yates field as a stimulation technique[3]
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