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Petroleum Industry Cases

Case 1


Reservoir description:low-energy and sandstone reservoir
Fluid characteristics:Wax Appearance Temperature 45 °C, high-content wax 20% formation oil viscosity of 6.3 cp, 26 API
Development description:9 Oil wells and 2 water wells. Average oil production of single well was 8.4 bbl / day, 93.4% of Water-cut
Measures to enhance oil recoveryWater flooding with the mixtures of rhamnolipid (0.2-1.0% ), chemical surfactant ( 0.01-0.2% ) and polymer ( 0.05-0.1% ). Slug injection with the first slug high concentration and the second low concentration.
ResultDuring the 14 months, oil production of a single well was enhanced from 8.4 bbl / day to 11.6 bbl / day. Water-cut was decreased by 1.6%, and cumulative incremental oil was more than 14100 bbl.


Case 2


Reservoir description:low-energy and sandstone reservoir, temperature 58 °C
Fluid characteristics: Wax Appearance Temperature 34 °C, high-content of wax, 30%; formation oil viscosity of 80 cp, 26 API
Development description:Wax deposition of oil wellbore has become a serious problem in this oilfield. Hot-washing sometimes caused the oil production to decrease and damage the reservoir formation, and is not cost-effective. And also chemical methods were harmful to health.
MeasuresMicrobial paraffin removal with the rhamnolipid and lipopeptide of fermentation liquid. The concentration of injection is 2000-7000 ppm.
ResultGreatly extended the cycle of hot-washing ( from 30 days to 168 days), thereby reducing the number of hot-washing treatments; provided economic benefits of $ 400,000


Case 3


Reservoir description:Sandstone system, lack of bottom water, formation pressure of 1420 psi, temperature of 58°C. Average porosity of 20%
Fluid characteristics:Wax Appearance Temperature ( 45 °C ), high-content of wax ( 37% ), formation oil viscosity of 6.5 cp, Salinity of 4124 mg/l, water type NaHCO3, 29 API.
Development description: 24.8% of reservoir recovery, 92.9% of water-cut; Average oil production of single well:12.1 bbl/day;
Measures to increase production Microbial puff-huff with the rhamnolipid of fermentation liquid. The concentration of application is 2000-7000 ppm.
Result Average oil production of single well was enhanced from 12.1 bbl/ day to 17.8 bbl/day.


Case 4


Reservoir description:High permeability ( 0.8-1.1 D ) sandstone reservoir, temperature of 55°C, Average porosity of 30%
Fluid characteristics:Wax Appearance Temperature ( -10°C ), high-content asphaltene ( 17% ), oil viscosity of 1000 cp, 15 API. Salinity of 4500-5500mg/l, water type NaHCO3 dominant.
Development description:Pressure of injection wells 1230 psi; Average oil production of 26.1 bbl, water cut 95.3%
Measures to increase productionMicrobial flooding with the rhamnolipid of fermental liquid. The concentration of application is 3000-6000 ppm.
ResultDuring six months, Average oil production of single well was enhanced by 13.0 bbl, water cut decreased by 1.2%; the cumulative incremental oil of two wells more than 5,118 bbl.


Case 5


Reservoir description:High permeability (0.6-1.0 D) sandstone reservoir, temperature of 58°C. Average porosity of 31.4%
Fluid characteristics:Wax Appearance Temperature ( -15°C ), content of asphaltenes ( 20% ), oil viscosity of 1100 cp, Salinity 5000-6000 mg/l, water type NaHCO3, 15API.
Development description:Injection well pressure 1300 psi; Daily oil production of 48.3 bbl, water cut of 94.1%
Measures to increase production Microbial flooding with the rhamnolipid of fermentation liquid. The concentration of application is 3000-7000 ppm.
Result During four months, average oil production of single well was enhanced by 14 bbl-59 bbl, water cut decreased by 2-10 %, the cumulative incremental oil from two wells more than 3386 bbl.


Case 6


Reservoir Description:Permeability ( 0.15-0.2 D ), sandstone reservoir, temperature of 25°C, Average porosity of 15-20%
Fluid Characteristics:High-content of asphaltene ( 55-65% ), oil viscosity of 50-80 cp, Salinity of 12000-15000 mg/l, water type NaHCO3, 26 API.
Development description:24 oil wells and 4 water wells, water cut of 58-85%
Measures to increase productionMicrobial flooding and microbial huff-puff with the rhamnolipids. The concentration of application is 3000-8000 ppm.
ResultDuring ten months, the cumulative incremental oil was more than 23200 bbl.


Case 7


Reservoir description: Permeability ( 0.12-0.22 D ), conglomerate reservoir, temperature of 30-50°C, Average porosity of 10-15%
Fluid characteristics:High-content of asphaltene ( 50-60% ), oil viscosity of 120-150 cp, Salinity of 10000-30000 mg/l, water type NaHCO3, 24 API.
Development description:80 oil wells, water cut of 70-85%
Measures to increase production Microbial flooding and microbial huff-puff with the rhamnolipid. The concentration of application is 3000-10000 ppm.
Result During ten months, the cumulative incremental oil was more than 48100 bbl.