METHOD OF OIL POOL DEVELOPMENT WITH GAS CAP AND BOTTOM WATER Russian patent published in 2010 - IPC E21B43/30 E21B43/20 

FIELD: oil-and-gas production.

SUBSTANCE: it is implemented sequential drilling-out from centre of oil pool to oil-drainage boundary in area of gas and oil contact in horizontal injection wells, sub-orthogonal to oil-drainage boundary. It is implemented pumping into mentioned wells of displacement agent with different temperature with creation of barrier in the range of gas-and-oil contact. Simultaneously it is implemented sequential drilling-out from centre of oil pool of injection wells under water-oil contact and over water-oil contact of horizontal producing wells, sub-parallel to water-oil contact and sub-orthogonal to oil-drainage boundary. Additionally bottoms of injection and producing wells are oriented in the direction from oil pool centre to contours, correspondingly, gas content and oil-bearing capacity with formation of selectively-radial in line system of wells location. During drilling-out of each injection and producing well up to structure of horizontal bore it is implemented drilling of directional pilot bore, opening producing oil-saturated strata nearby middle of path of rated horizontal bottom with simultaneous pickup of information about geological feature of producing formation for definition of optimum position of horizontal bottoms of producing and injection wells and adjustment of positions of oil-water and gas-oil contact.

EFFECT: increasing of extraction ratio of oil at minimal amount of drilled out wells ensured by creation by means of displacement agent of waterproof barrier between oil rim and gas cap.

2 ex, 2 dwg