METHOD OF OIL WELL DEVELOPMENT (VERSIONS) Russian patent published in 2015 - IPC E21B43/32 

FIELD: oil and gas industry.

SUBSTANCE: according to method of development of oil well containing oil-bearing stratum and underlying water-bearing stratum divided by bulkhead having thickness of 0.8-2m the well is surveyed in order to identify position of oil-bearing and water-bearing stratum strata. State of the flow string is defined. Behind-the-casing-flows are identified. Inflow and injection profiles are defined. Then water-bearing stratum is perforated. A packer is run down to the upper boundary of water-bearing stratum and set. Then water shutoff compound is injected and flushed to water-bearing stratum in volume precalculated as per analytic expression. Water shutoff screen is formed. Then the packer is pulled out. Cement grout is pumped to the flow string up to the level higher than roof of oil-bearing stratum until it forms a cement plug insulating the stratum. Upon waiting period for cement hardening the cement plug is drilled out up to the depth higher than roof of water-bearing stratum. At that minimum waiting period for cement hardening is equal to 24-72 hours. Tightness of the bottom hole is surveyed. The oil-bearing stratum is penetrated within the required interval and oil is recovered.

EFFECT: reduced probability of behind-the-casing flows in underlying water-bearing strata, increasing oil flow rate and reducing water encroachment in oil.

2 cl, 1 tbl, 1 dwg