Retention and adsorption loss of sulfonate displacement system in porous formation sand

Key words:  sulphonates oil displacement agent  retention loss  adsorption loss  porous medium  porous throat  formation sand

Abstract:

The adsorption loss on the surface of sand and the retention loss of commixture sulfonates used for oil displacement in porous sand were respectively investigated by using two phase titration method. The results show that the adsorption loss of sulphonate oil displacement agent is mainly relevant to surface area of sand surface. However, the retention loss caused by the pore volume and the structure of pore throat is the dominant factor in flooding process. The adsorption on sand surface or the retention in porous medium sharply decreases the effective concentration of this kind of oil displacement agent. The dissolution performance of sulphonates oil displacement agent in water phase can be increased by solubilization effect among different compositions, as a result, the amount of free form molecule reduced, so it is an effective approach to decrease the loss of sulphonates oil displacement agent.