METHOD OF DEVELOPMENT OF CREVASSED-POROUS STRATIFIED RESERVOIR Russian patent published in 2016 - IPC E21B43/30 E21B43/20 

FIELD: oil and gas industry.

SUBSTANCE: under the method the vertical injection and branched-horizontal (BHW) production wells are drilled. The horizontal bores are arranged in the oil-saturated interlayers. The oil production from the horizontal bores of the production wells, and the working agent injection in the injection wells are performed simultaneously. Wherein the main vertical bore of BHW is drilled. Studies determine time of front movement of the capillary imbibition from the injection well via the each interlayer of the reservoir to the main vertical bore of BHW. Based on this the specific rate of the capillary imbibition of each interlayer is calculated using the analytic expression. In the interlayer corresponding to the lowest value of the specific rate of the capillary imbibition the horizontal bore is drilled from the main vertical BHW at angle α = 50-70° to the line being the minimum distance between the production and injection wells. The length of the horizontal bore and distance of front movement of capillary imbibition are determined. For the rest interlayers the distances past by the capillary imbibition being radiuses of relative circle in the appropriate interlayer are determined. For the relative circles the tangents are plotted from the point of main vertical bore of BHW in the appropriate interlayer. Along the obtained tangents the horizontal bores of BHW are drilled to length corresponding to the point of contact with circles. In the main vertical bore of BHW between the interlayers the shaped shutters are installed. In each horizontal bore at same distance from 1 to 5 packers are installed. During BHW operation successively from "head" of horizontal bore to "bottom" the watered intervals are disconnected upon the front movement of the capillary imbibition from the injection well to the production well.

EFFECT: increased uniformity of oil stocks production, and increased oil recovery of the stratified reservoir.

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