METHOD TO DEVELOP OIL POOL Russian patent published in 2012 - IPC E21B43/20 

FIELD: oil-and-gas production.

SUBSTANCE: proposed method comprises oil withdrawal via production wells and injecting working agent via injection wells in cyclic manner: 10 to 20 days - injection, 10 to 20 days - break. Note here that all injection wells are communicated via ground system of air ducts to allow working agent cross-flows. In compliance with this invention, mean arithmetic magnitude of bed pressure in injection wells and water cut in production wells is determined. Injection wells with bed pressure lower than average one is related to decreased pressure zones while injection wells with bed pressure exceeding mean bed pressure is related to increased pressure zones. Production wells with water cut exceeding mean value are relates to increased water cut zones while those with water cut smaller than mean value are related to lower water cut zones. Injection wells are grouped by parts. Part of injection and/or production wells with high water cut located in zone of increased bed pressure, nearby oil content outline, is equipped with downhole electrically driven rotary pumps set to boost fluid pumping. Fluid extracted from said wells is injected via existing water ducts into injection wells located in lower bed pressure zone inside oil content outline. Besides, production wells in higher water cut zone is grouped, nearby water content outline. Said wells are set to boost oil production. Oil production volume is decreased in production wells in lower water cut zone inside oil content outline.

EFFECT: higher oil recovery efficiency.

1 dwg