MULTI-SITE OIL DEPOSIT DEVELOPMENT METHOD Russian patent published in 2012 - IPC E21B43/14 E21B43/30 E21B43/20 

FIELD: oil and gas industry.

SUBSTANCE: method involves drilling of upper site with coarse grid of exploratory wells, production extraction through production wells and injection of working agent through injection wells. According to invention, there performed is optimum arrangement of project fund of production and injection wells on the plan of upper site within the limits of economically substantiated profitable isopachyte of not less than two metres. At least one horizontal well is drilled with inlet to upper production site, upper productive object is passed to the length of 30-70 m under zenith angle of 82-86°, connection strap between sites are passed on stabilisation of zenith angle, lower site is entered along the shaft through 10-12 m, well is cased with casing, casing shoe is installed through 10-12 m along the shaft from roof of lower production site, space behind casing is isolated, and drilling is continued at the interval of the second lower production site through 50-100 m with output to zenith angle of 88-90°. Controllable filter with two doors is installed above and below clay interval; doors are closed and upper and lower sites are isolated from each other. Production string with inlet is lowered to lower site, oil-saturated part of upper site in string is perforated; well is developed as production well if it is located in roof and/or near-roof, and/or slope parts of structures controlling the oil deposit; with implementation of equipment of simultaneous separate operation of the well and operation of sties at various design drawdowns preventing early watering-out of extracted product. Well is developed as injection one if it is located in lower parts of structures. Equipment of simultaneous separate pumping is implemented and pumping of displacement agent is performed under various design pressures per each site, which provide optimum water-intake rate.

EFFECT: increasing oil production of the deposit and providing economy of investments due to drilling of one grid of design wells.

2 cl, 4 ex, 3 dwg