A Laboratory Study on the Interfacial Tension of Oil-CO2 System at Reservoir Conditions / Studi Laboratorium Terhadap Tegangan Antar Muka Sistem Minyak CO2 Pada Kondisi Reservoir

Abdurrahman, Muslim and Permadi, A.K. (2016) A Laboratory Study on the Interfacial Tension of Oil-CO2 System at Reservoir Conditions / Studi Laboratorium Terhadap Tegangan Antar Muka Sistem Minyak CO2 Pada Kondisi Reservoir. Jurnal Teknologi Minyak dan Gas Bumi, 12 (3). pp. 167-176. ISSN 0216-6410

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Abstract

Two major reasons for the national oil production to decline is the maturity of the fields and the continuously declining pressure. In the meantime, the primary and secondary phases are still dominating the production stage. As a result, an enhanced oil recovery (EOR) method is required to improve the oil recovery. The available methods are chemical, gas, or steam injections. Gas injection is a mature method and proved to be able to improve oil recovery. Indonesia is operating a number of gas fields with high CO2 content. This abundant source of CO2 is prospective to be used for gas injection in order to improve oil recovery. This study is aimed to determine the interfacial tension between oil and CO2 through a laboratory experiment at temperatures of 40oC, 60oC, and 80oC. The pressure is given at the range of 700 psi to 1800 psi. Through the study the reduction in interfacial tension at reservoir condition can be known. The interfacial tension is determined by calculations through the use of pendant drop method. The oil samples were taken from a reservoir within Air Benakat Formation lying in South Sumatera Basin. The result of the study shows that the interfacial tension of CO2 and the oil sample decreases significantly as the pressure increases. At the temperature of 40oC the interfacial tension decreases from 23.16 dyne/cm to 0.83 dyne/cm. At the temperature of 60oC the interfacial tension decreases from 24.25 dyne/cm to 2.52 dyne/cm. At the temperature of 80oC the interfacial tension decreases from 25.88 dyne/cm to 3.33 dyne/cm. The increase in pressure causes the decrease in the interfacial tension and inversely the increase in temperature causes the increase in the interfacial tension. This kind of study should necessarily be conducted prior to conducting CO2 injection in a desired field. The interfacial tension is strongly related to the other pertinent parameters such as wettability, capillary pressure, and gas dispersion. By knowing the reduction in the interfacial tension then the change in the three important parameters can also be known. The change in the mentioned parameters will provide significant contribution to the mechanism of improving oil production by CO2 injection.

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