METHOD FOR COMPLEX PROCESSING OF OIL DEPOSIT WITH GAS CAP Russian patent published in 2006 - IPC E21B43/20 E21B43/32 

FIELD: oil extractive industry, in particular, methods for extracting oil deposit with gas cap, preferably at beginning stage of extraction of oil deposit.

SUBSTANCE: method includes drilling directional force wells, product and gas wells, forcing water into oil bed through force wells, extracting oil through extractive wells and forcing incidental oil gas into gas cap through gas wells. In accordance to invention, in case of vertical penetrability of oil bed constituting 0,5-0,8 of its horizontal penetrability, at beginning development stage at least one more product well is drilled with at least one horizontal borehole. In directional product wells lower part of gas cap of bottomhole zone in contact with oil bed is isolated for thickness and depth not less than falling radius of bed pressure in bottomhole formation zone during oil extraction. That is a radius of bottomhole formation zone, in which depression on bed is at least 50% lower than difference of bed and bottomhole pressures in well. Isolation is performed first of all in wells with maximal depression on bottomhole formation zone. Through force wells fed in turns into oil bed are sub-product or senoman water and incidental oil gas.

EFFECT: decreased danger of entry of incidental oil gas from gas cap into extracting wells.

2 dwg