METHOD FOR LIQUIDATION OF BREAKDOWN DAMAGE IN OIL WELLS Russian patent published in 1997 - IPC

FIELD: oil industry. SUBSTANCE: method implies arrangement of second hole for liquidation of breakdown damage in oil well. For efficient operation with second hole, necessary is preliminary decision about feasibility of second hole, and decision is based on amount of residual extracted product. At point of opening of oil reservoir by second hole there must be maximal oil saturation at minimal flooding and low embracing by filtration. For determining predictable output, additionally carried out are field and laboratory filtration investigations with plotting diagrams of relative phase permeabilities and relations of product flooding F and relative productivity θ against water saturation of bottom-hole zone, and also changes of relative productivity of well. Determined according to Leveret function are water saturation in area of breakdown well, rate of dropping productivity of breakdown well and its specific potential productivity Ksp

, predicted is flooding of well product with second hole f_o and productivity dropping rate at new opening point θ₁ in comparison with earlier determined value. Anticipated initial output of well with second hole is calculated according to formula given in description. EFFECT: high efficiency. 1 tbl