A Laboratory Study of CO2-Foam Process for Bati Raman Field, Turkey

Abstract

ABSTRACT An immicible CO2 project has been continuing in Bati Raman field, Turkey. Field results indicated the early breaktrough of CO2 in most of production wells due to heavy oil content and fractured structure of the limestone reservoir. A laboratory study was conducted to investigate different aspects of the feasibility of in-situ foaming to improve mobility ratio and injection profile in Bati Raman reservoir. Well-known static screening tests were used to select the most suitable surfactants at atmospheric pressure. These tests together with high pressure static tests using synthetic reservoir brine showed better stability for 3 ethoxylated surfactants. To determine the retention properties of these surfactants static and dynamic experiments were performed. The effects of pH, flow rate and fractured structure of the reservoir rock on retention were also investigated. Higher surfactant losses resulted in partionning experiments. To justify the results of static foam tests and to investigate some dynamic parameters on gas mobility, dynamic tests across the sandstones and carbonate Bati Raman cores were carried out. Artificially fractured Bati Raman cores were utilized to better simulate the heterogeneity of the reservoir.