DEVELOPMENT METHOD OF NON-HOMOGENEOUS OIL DEPOSIT AT LATE STAGE OF DEVELOPMENT Russian patent published in 2012 - IPC E21B43/20 E21B47/10 

FIELD: oil and gas industry.

SUBSTANCE: development method of non-homogeneous oil deposit involves drilling of production and injection wells, flooding of formation from injection wells and oil extraction to the surface via production wells. Geological structure is checked, various structural zones of deposit are determined as per results of drilling and simulation. Additional new shafts of production wells are drilled based on the zones determined. Deposit is divided in zones concerning levels of its roof location. At that additional wells are drilled as vertical shafts in zones of maximum pitch of roof, the shafts are used for production. Wells of old pattern located in these zones are used as certain production and injection wells. Besides before start of extraction in additional and certain production wells, hydrostatic level of liquid column measured from deposit roof in these wells and level of oil-water contact (OWC) are determined. At that production is performed below OWC level; upon production hydrodynamic layer in additional wells is maintained in lower third part of hydrostatic level and in certain wells - in the middle third part.

EFFECT: improving efficiency of development of non-homogeneous deposits, increasing oil removal and increasing flow rate.

2 dwg, 1 ex