METHOD OF IMPLEMENTATION OF VERTICAL WATER FLOODING OF OIL DEPOSIT Russian patent published in 2008 - IPC E21B43/20 

FIELD: oil and gas industry.

SUBSTANCE: it is object of invention to increase yield of oil from laminar-non uniform oil horizons by method of vertical water flooding. The essence of the invention is as follows: the method consists in boring of producing and pressure wells and in displacement of oil with pumped water. A trial place is arranged on base of two horizontal wells or side horizontal boreholes. For this purpose a producing horizontal well or producing side horizontal borehole from an existing well is bored and also a pressure horizontal well or pressure side horizontal borehole from an existing well is bored. Additionally the producing horizontal borehole is located near a top of the horizon, while the pressure horizontal borehole is located near the bottom of the horizon; boreholes are parallel to each other and to longitudinal axis of the structure; their horizontal projection lie at the distance of nor more, than 150 m. In one of the boreholes a driving force is generated by means of pumping water or withdrawing oil; in another borehole there are registered variations of pressure with time. In case of response to driving force the value of permeability along the vertical coordinate is determined on variations of pressure; the trial operations are performed with pumping water into the pressure borehole and withdrawing oil from the producing borehole. Also the following is observed: variations of oil yield with time, watering in the producing borehole, water consumption in pressure borehole, and bottom hole and horizon pressure in both boreholes. On base of results obtained in trial operations there is designed and implemented the process of vertical water flooding of the horizon implementing one row system of placement of producing horizontal boreholes near the top of the horizon and pressure horizontal boreholes near the bottom of the horizon with a set off in plane of bottom holes of producing and pressure wells similar to arrangement of vertical wells at one-row system.

EFFECT: upgraded efficiency of method.

1 ex, 1 tbl, 4 dwg