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• W1976875475 abstract "Abstract Most reservoirs at some point in their life are candidates for Enhanced Oil Recovery (EOR). Successive to microbial enhanced oil recovery (MEOR) when reservoir is put on waterflooding, water cut greater than 80% is observed after sometime. Then either a second round of MEOR is planned or the well is abandoned. Another round of MEOR takes at least six months, is expensive and complicated than waterflooding. The proposed tool will assist in detecting the bypassed oil after a cycle of MEOR and help make the best choice of recovery method to be used next, namely MEOR or waterflooding. The tool will work on the principle of Resonance Raman Spectroscopy (RRS). Since the microbes used in MEOR are exactly known, their response to RRS on the surface can be tested and the same response from inside the reservoir can be noted. In this way the microbes can be detected downhole by the Resonance Raman spectra which they exhibit. The microorganism detection is based on identification and excitation of chemotaxonomic markers present in them. Since microbes only survive on the oil-water interface wherever microbes will be detected, it is clear that oil is still present in that region. This depth will be sensed using depth sensor. Water being Raman inactive, at whatever depth thief zones of water are formed no spectrum will be observed and these zones can be detected and plugged thus deviating water to oil-bearing zones. The tool will be lowered downhole by optical fibers which can also transmit the reflected light to a computer on the surface to view the spectra. The nano optical fibers will penetrate the formation and carry the laser light in porous rock matrix and receive the reflected light. The tool can also identify different microorganisms present in reservoir. This helps in knowing the reservoir parameters like temperature, pressure, salinity etc, since every type of microbe has a particular environment in which it can survive. When waterflooding is done after any other thermal or chemical recovery process the tool can track oil instead of microbes directly by sensing H-C, H=C etc. bonds present in oil. Introduction The need to make the 'Oil-Microbe Detection Tool' arises from the fact that 'Easy Oil' is becoming scarce rapidly. There is an acute need to find efficient methods to recover the bypassed oil or the oil left behind after waterflooding, which has followed a cycle of MEOR. Once the water cut starts increasing normally another MEOR operation is planned to recover such oil, microbial plugging is undertaken or the well is abandoned. Another MEOR operation is more expensive, complex and takes minimum six months thus extending the overall duration of the EOR operation. The oil industry deals with the subsurface all the time and exact knowledge of downhole conditions is a constant need to make efficient planning of the right EOR method applicable in conditions as mentioned above to recover this bypassed oil. To detect this oil and recover it, the correct locations where such oil is remaining have to be ascertained. This tool can help find such locations precisely in-situ. The planning of EOR operation after knowing the precise regions where bypassed oil resides will become easier and efficient. Also, the uniqueness of the tool lies in the fact that it detects bypassed oil by using microbes. Hence, it will be used in co-ordination with MEOR and waterflooding where MEOR provides the microbes to be detected." @default.
• W1976875475 created "2016-06-24" @default.
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• W1976875475 date "2008-03-29" @default.
• W1976875475 modified "2023-10-14" @default.
• W1976875475 title "Oil-Microbe Detection Tool Using Nano Optical Fibers" @default.
• W1976875475 doi "https://doi.org/10.2118/113357-ms" @default.
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