Stable supply of petroleum in coming years using Enhanced Oil Recovery EOR techniques is an issue of prime importance, though most of EOR techniques which can effectively act to recover compulsively the residual crude oil are still in testing stage. Microbial EOR MEOR is generally understood to be at the similar stage. Regarding MEOR, there are two points of issue. One is how to transplant target microbe s into the formation where needed and the other is how to activate their microbial metabolic function where to execute the role. These are indispensable to establish MEOR technology as a practical technology. Hence, promotion of those techniques based on the scientific approach becomes increasingly important. Through TRC-Jilin Oil Corp. joint-research reviewed in this paper, importance of this concept was confirmed and it was also shown that these two techniques described above are controllable and available at the field level. In particular, the microbial profile modification is not only a direct method to enhance the oil recovery, but also an effective pretreatment technique for transplanting the microbe s to a target reservoir region. It is not an exaggeration to say that a new era of MEOR technology has begun with the above-described field research in China. And, it is indicated that strategies of reservoir development based on the overall plan considering a combination of applicable IOR/EOR techniques through the whole production period become more important than ever before Keywords Microbial Enhanced Oil Recovery MEOR , Recent advances in MEOR, Microbial profile modification, Transplant of microbe s into a reservoir, MEOR field test in China. * Chugai Technos Corp. Environmental Business Div. Bio-Business Dpt.
Understanding of interfacial interactions among supercritical CO 2 (scCO 2 ), water, and mineral phase is necessary for a precisely prediction of CO 2 migration into aquifers. The purpose of this study is to assess the impact of scCO 2 on flow property of Kimachi sandstone and Iidate granite in a CO 2 rich dense phase i.e., the condition of which scCO 2 is expected to displace formation water in the course of CO 2 injection. In this experiment, the permeability test for CO 2 gas was conducted before and after a CO 2 saturation procedure that is filled with scCO 2 in pores of rocks. To investigate a mechanical property of rock specimen in the presence of scCO 2 , the axial strain was also measured using a laser displacement sensor during scCO 2 saturation processes.Our results showed that both Kimachi sandstone and Iidate granite samples tested have a more or less decreasing trend of gas permeability with increasing exposure time to scCO 2 . It was further shown that the axial strain of Kimachi sandstone and Iidate granite increased as scCO 2 -exposure time increased.Additionally, increases in masses and dimensions of test samples before and after scCO 2 saturation processes were clearly observed under atmospheric pressure conditions. It can, therefore be said that Kimachi sandstone and Iidate granite could be capable of swelling and permeability change accompanied by CO 2 sorption into their internal structures in the presence of scCO 2 . Furthermore, the observed significant reduction in permeability cannot fully be explained by two model predictions based on Kozeney-Carman equation and Hagen-Poiseuille law, considering CO 2 sorption onto mineral phases.The present results pointed out that CO 2 sorption on rocks under geological CO 2 storage conditions could have a significantly impact on flow property of rocks during CO 2 injection and storage processes.
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