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Abstract

Numerical simulation of multicomponent adsorption (such as in foam-forming surfactants, lignosulfonate, polymer/surfactants, etc.) is still at an early stage. Mathematical models of multicomponent adsorption and desorption in a surfactant/rock system have not yet been well developed. In this paper, a mathematical model for multicomponent adsorption, based on surface excess theory, is presented. The mathematical model is validated through more than 30 experimental runs under a wide range of operating conditions. Several multicomponent mixtures were used in the experimental runs to observe the effects of surfactant concentration, chemical slug size, flow rate, rock properties, salinity of the surfactant solution, and temperature. With the application of lignosulfonate as a sacrificial adsorbate, the amount of surfactant adsorption can be reduced significantly. Polymersurfactant solution flooding system is a economical way to increase the efficiency of chemical injection. Polymer has beneficial effects on surfactant adsorption though polymer itself still has strong adsorption at the solid/liquid interface relative to surfactant. Numerical simulation results showed excellent agreement with experimental data.

Introduction

The phenomenon of adsorption and desorption at solid/liquid interface is of major importance in the process of enhanced oil recovery with the application of surfactant. More recently, foam-forming surfactants have been used in remediating contaminated soils foam-forming surfactants have been used in petroleum industry for enhanced oil recovery. Some simulation research had been made with regards to the processes of surfactant flooding. The behavior of surfactant under various conditions had been studied by different researchers. Adsorption is one of the main mechanisms for surfactant loss in any process that uses surfactants. Laboratory study and field tests indicated that surfactant loss by adsorption could be significantly reduced reflushing lignosulfonate as a sacrificial adsorbate. Different mechanisms of surfactant adsorption have been recognized and adsorption modeling were made with good results

Surfactant adsorption at the solid/liquid interface can be modeled with either a Langmuir-type model or a surface excess model. The Langmuir equation was used in simulating adsorption and desorption of some chemical floodings in enhanced oil recovery. For a thermodynamically consistent study, the surface excess theory is more suitable to model surfactant adsorption and desorption at the solid/liquid interface.

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