Method for extracting residual crude oil in oil field by using foam compound system
A system and foam technology, applied in the field of tertiary oil recovery in oilfields, can solve the problems of large binary compound flooding dosage, uneven distribution, and reduced interfacial tension between oil and water, so as to achieve good mobility control ability, increase economic benefits, and enhance oil washing ability Effect
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example 1
[0023] Oil-bearing area of 1.5km in Block 106 of Piles No. 6 in Daqing Oilfield 2 , the crude oil reserve is 1.12 million tons, and the calibrated recovery rate is 29.7%. The thickness of the oil layer in the eastern block is between 2.3 and 9.1 meters, and the oil layer is roughly distributed in an east-west direction. It is a high-pressure porosity and medium permeability oil layer, with an average porosity of 33.9%, and an air permeability of 556.7mD. The selectivity is medium. The relative density of surface crude oil is 0.9382-0.9552, the viscosity of crude oil is 340mPa·s, the wax content is 9.43-11.83%, the freezing point is low, the original formation pressure is 14.08MPa, and the pressure coefficient is 1.017. The salinity of formation water is 2710~3666mg / L, among which the mass concentration of chloride ion is 1167~1697mg / L, which is MaHCO 3 water type.
[0024] The mining is mainly carried out in the east of Zhuang 106 block. There are 9 oil and water wells i...
example 2
[0041] Daqing Oilfield No. 1 Oil Production Plant is located in the northern part of the Sazhong Development Zone. It starts from the third row of the first area in the north, reaches the third row in the south, reaches the 98# fault in the west, and ends in the eastern transition zone in the east. Sapu Oil Reservoir has an oil-bearing area of 25.79km 2 , geological reserves 16558.82×10 4 t, in which the geological reserves of Sa+Pu Group II oil layers are 11673.27×10 4 t, accounting for 70.5% of the Sapu oil layer reserves in the block, the reserve abundance is 452.62×10 4 t / km 2 . The Sa and Pu oil layers are a set of interbedded deposits of gray, gray-green, and brown sand-mudstones, and the bedding is mainly horizontal bedding, containing ostracod fossils. The reservoir space of the oil reservoir is dominated by primary intergranular pores, with a porosity of 22-26%, an average porosity of 24.32%, an original oil saturation of 56-76%, an air permeability of 200-1600...
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