A microbial huff and puff oil recovery method for high water-cut heavy oil reservoirs, a heavy oil viscosity reduction method for high water-cut heavy oil reservoirs, and a nutrient activator
A technology of heavy oil reservoirs and microbes, applied in drilling compositions, chemical instruments and methods, production fluids, etc., can solve problems such as material waste
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Embodiment 1
[0058] The implementation object of this embodiment is a certain oil well, the crude oil viscosity of this oil well is 11054mPa·s (under the oil layer temperature), the oil layer temperature is 63 ℃, the oil layer is 1.5m away from the lower water layer, the formation fracture pressure is 12MPa, and the original bacteria content is 10 1-2 pieces / mL, salinity 80000mg / L, formation water sensitive. The oil layer is 3.4m thick with a porosity of 28%; the lower water layer is 2.3m thick with a porosity of 21%. Due to steam injection and interlayer channeling, the water content of the produced fluid suddenly rose from 64% in the previous round to 100%, resulting in the temporary shutdown of the oil well for one year. The produced water of the oil well in this example was subjected to indoor evaluation experiments under reservoir conditions, and it was confirmed that the microbial huff and puff oil recovery method for high water-cut heavy oil reservoirs of the present invention can b...
Embodiment 2
[0070] The crude oil viscosity of a certain oil well as the embodiment object of this embodiment is 768mPa·s (under the oil layer temperature), the oil layer temperature is 42°C, the oil layer is 0m away from the lower water layer, the formation fracture pressure is 8.5MPa, and the original bacteria content is 10 2 / mL, salinity 90000mg / L, formation water sensitive. The oil layer is 3.1m thick with a porosity of 27%; the lower water layer is 2.1m thick with a porosity of 19%. The oil well is driven by bottom water for normal production. After 6 months of production, the water content of the produced fluid suddenly rose from 45% to 98% within two months, causing the oil well to be temporarily shut down for half a year. The produced water of the oil well in this example was subjected to indoor evaluation experiments under reservoir conditions, and it was confirmed that the microbial huff and puff oil recovery method for high water-cut heavy oil reservoirs of the present inventio...
Embodiment 3
[0082] The oil well crude oil viscosity as the implementation object of this embodiment is 3847mPa·s (under the oil layer temperature), the oil layer temperature is 36 ℃, the oil layer is 1m apart from the lower water layer, the formation fracture pressure is 6MPa, and the original bacteria content is 10 1-2 / mL, salinity 45000mg / L, the formation is not water sensitive. The oil layer is 2.8m thick with a porosity of 29%; the lower water layer is 2.9m thick with a porosity of 26%. Due to steam injection and interlayer channeling, the water content of the produced fluid suddenly rose from 71% in the previous cycle to 100%, resulting in the temporary shutdown of the oil well for 2 years. The produced water of the oil well in this example was subjected to indoor evaluation experiments under reservoir conditions, and it was confirmed that the microbial huff and puff oil recovery method for high water-cut heavy oil reservoirs of the present invention can be implemented without injec...
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Abstract
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