METHOD FOR DEVELOPMENT OF SEPARATE SMALL OIL LENSES Russian patent published in 2014 - IPC E21B43/20 

FIELD: oil and gas industry.

SUBSTANCE: while developing separate small oil lenses penetrated by a single well extraction of the formation fluid is alternated with injection of a displacement agent. Injection of a displacement agent is made at pressure that does not exceed breakdown pressure determined against geological and physical parameters of the lens until intake reduces per 50% in comparison with the initial value. Fluid extraction is made till the oil production rate decreases per 20-60% in comparison with the initial value. At that injection periods at the initial stage are made through equal time intervals until formation pressure reaches the initial value. Extraction periods at the initial stage are also made in equal time intervals until formation pressure reduces up to 80-90% of bubble point pressure. At that the initial development stage is considered completed when the initial oil production rate decreases in the second and next extraction cycles up to 30-60% of the initial oil production rate in the first cycle.

EFFECT: improvement of the formation oil recovery due to changes in extraction and injection modes.

1 ex, 5 dwg