Mechanistic Modeling of Alkaline/Surfactant/Polymer Flooding for Snorre Field from Core-scale to Larger Scale of One-Spot Pilot

摘要

A considerable amount of oil resides in the Snorre reservoir in the North Sea. The impact of lowsalinitywater flooding was investigated from corescale using coreflood tests to larger scale of onespot pilot using SingleWellChemicalTracer (SWCT) tests before. Since the results showed a negligible amount of oil recovery, the alkaline/surfactant/polymer (ASP) flooding has been selected after the evaluation of the feasibility of all possible chemical enhanced oil recovery (EOR) methods based on the reservoir conditions. The potential of ASP has been evaluated through mechanistic modeling from core scale to large scale of onespot pilot using SWCT test. First, the mechanistic modeling of ASP coreflood has been performed to make sure about the proper propagation of alkali, insitu surfactant (soap), and surfactant. Second, the ASP injection has been also evaluated at larger scale of onespot pilot using SWCT method. Mechanistic modeling of ASP flooding is highly sophisticated because of the complicated ASP phase behavior and the reactions that affect the process. Almost all effective reactions have been taken into account. Although lowsalinitywater flooding as a standalone method could not improve oil recovery, the effect of lowsalinitywater on the ASP efficiency has been studied to design and optimize the ASP method.