Abstract
Mengulin sandstone reservoir in Huabei oilfield is low- temperature heavy oil reservoir. Recently, it is at later stage of waterflooding development. The producing degree of water flooding is poor, and it is difficult to keep yield stable. To improve oilfield development effect, according to the characteristics of reservoir geology, microbial enhanced oil recovery to improve oil displacement efficiency is researched. 2 microbial strains suitable for the reservoir conditions were screened indoor. The growth characteristics of strains, compatibility and function mechanism with crude oil were studied. Results show that the screened strains have very strong ability to utilize petroleum hydrocarbon to grow and metabolize, can achieve the purpose of reducing oil viscosity, and can also produce biological molecules with high surface activity to reduce the oil-water interfacial tension. 9 oil wells had been chosen to carry on the pilot test of microbial stimulation, of which 7 wells became effective with better experiment results. The measures effective rate is 77.8%, the increased oil is 1,093.5 tons and the valid is up to 190 days.
Highlights
Mengulin sandstone reservoir in Huabei oilfield is located in Erlian Basin
Under the reservoir temperature condition of 35 °C, the crude oil physical property is poor with high viscosity of 179.1 mPas, high oil-water viscosity ratio of 259, high colloid and asphalt quality score of 36.8% and high density of 0.9012 g/cm3, being the typical heavy oil reservoir
In order to solve the problem of lower waterflooding efficiency caused by huge crude oil viscosity, high oilwater viscosity ratio and poor crude oil liquidity, microbial degradation technology is researched
Summary
Mengulin sandstone reservoir in Huabei oilfield is located in Erlian Basin. The average porosity is 22.4% and the permeability is between 334.8 to 749.7 mD. Under the reservoir temperature condition of 35 °C, the crude oil physical property is poor with high viscosity of 179.1 mPas, high oil-water viscosity ratio of 259, high colloid and asphalt quality score of 36.8% and high density of 0.9012 g/cm, being the typical heavy oil reservoir. In order to solve the problem of lower waterflooding efficiency caused by huge crude oil viscosity, high oilwater viscosity ratio and poor crude oil liquidity, microbial degradation technology is researched. Through the microbe itself and its metabolites reacting with crude oil to improve product properties, the waterflooding displacement efficiency is improved [1-6]. The key for microbial enhanced oil recovery is to screen excellent strains. Selecting from the high colloid and asphalt content environment, through the enrichment and purification, 2 strains of HB-1 and HB-2 is eventually isolated
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