As one of the Enhanced Oil Recovery (EOR) methods, CO2 injection is one of the methods used after secondary recovery to increase oil recovery. Based on the successful application of CO2 injection in some countries and the need of fulfillment of energy demand in Indonesia, CO2 injection can be the best method to be used for EOR. This method injects CO2 that has been observed in the laboratory through injection well to reservoir. In the reservoir, CO2 gas will be miscible with oil to decrease oil’s viscosity. But, to be miscible with oil and to avoid the reservoir problem, the Minimum Miscible Pressure (MMP) must be observed in the laboratory. Moreover, a reservoir simulation investigation must be performed to get a promising result. In this paper, the laboratory experimental and reservoir simulation on MMP to achieve CO2 gas miscibility on oil sample from HIL oil field has been performed. The MMP result from the laboratory experiment is 2385 psia and is increasing oil recovery up to 85% while the MMP from reservoir simulation is 2404 psia. With the differential value of just 19 psia or error of 0. 89%, this finding can be the basis for a recommendation to develop a CO2 project in the HIL oil field.
The objective of this paper is to determine the optimum anaerobic-thermophilic bacterium injection (Microbial Enhanced Oil Recovery) parameters using commercial simulator from core flooding experiments. From the previous experiment in the laboratory, Petrotoga sp AR80 microbe and yeast extract has been injected into core sample. The result show that the experiment with the treated microbe flooding has produced more oil than the experiment that treated by brine flooding. Moreover, this microbe classified into anaerobic thermophilic bacterium due to its ability to live in 80 degC and without oxygen. So, to find the optimum parameter that affect this microbe, the simulation experiment has been conducted. The simulator that is used is CMG – STAR 2015.10. There are five scenarios that have been made to forecast the performance of microbial flooding. Each of this scenario focus on the injection rate and shut in periods. In terms of the result, the best scenario on this research can yield an oil recovery up to 55.7%.
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