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( Tola Sreu ),( Kyuro Sasaki ),( Yuichi Sugai ),( Ronald Nguele ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
The present study investigated, therefore, the potential of stabilized Nanofluid (NF) to increase the production of a stranded light crude oil. Silica nanoparticle (SiO2-NP) was selected as a primary one. The Polyvinyl Alcohol (PVA) was blended in the base fluid to increase the NF stability. The SiO2-NF was prepared in the CO2-rich condition. It was found that SiO2-NF becomes stable for up to 1 week without any visible precipitation at 55°C considered as a reservoir temperature. The stable SiO2-NF has not formed with the absence of CO2-rich environment, and the NF precipitation was observed after a while. The Interfacial tension (IFT) between oils and NF, which was measured by the pendant drop method at room temperature, revealed a negligible of IFT reduction. Furthermore, contact angle measurements using the sessile drop method at room temperature showed the wettability of rock was altered to be more water-wet when NF was used. Subsequently, core-flooding (CF) experiments were carried out using two different types of oils (Light Japanese Oil, LJO and Light Mineral Oil, LMO) in the Berea sandstone. The injecting SiO2-NF into the core after the water flooding increased the oil recovery factor (RF) of 7.6% larger than injecting PVA solution alone (RF=1%). The main mechanism of the increment of oil using NF was expected to be a plugging function of SiO2-NPs in the micropores in the cores because the NPs block the higher permeability fluids passes and push the oil out from low permeability zone with higher oil saturation.
Microbial Consortia in Oman Oil Fields: A Possible Use in Enhanced Oil Recovery
( Al Bahry Saif N ),( Abdulkader E. Elsahfie ),( Yahya M. Al Wahaibi ),( Ali S. Al Bimani ),( Sanket J. Joshi ),( Ratiba A. Al Maaini ),( Wafa J. Al Alawai ),( Yuichi Sugai ),( Mussalam Al Mandhari ) 한국미생물 · 생명공학회 2013 Journal of microbiology and biotechnology Vol.23 No.1
Microbial enhanced oil recovery (MEOR) is one of the most economical and efficient methods for extending the life of production wells in a declining reservoir. Microbial consortia from Wafra oil wells and Suwaihat production water, Al-Wusta region, Oman were screened. Microbial consortia in brine samples were identified using denaturing gradient gel electrophoresis and 16S rRNA gene sequences. The detected microbial consortia of Wafra oil wells were completely different from microbial consortia of Suwaihat formation water. A total of 33 genera and 58 species were identified in Wafra oil wells and Suwaihat production water. All of the identified microbial genera were first reported in Oman, with Caminicella sporogenes for the first time reported from oil fields. Most of the identified microorganisms were found to be anaerobic, thermophilic, and halophilic, and produced biogases, biosolvants, and biosurfactants as by-products, which may be good candidates for MEOR.