DEVELOPMENT OF OIL DEPOSITS BY WELLS COMMUNICATED VIA PRODUCTIVE FORMATION Russian patent published in 2015 - IPC E21B43/16 E21B43/26 

FIELD: oil and gas industry.

SUBSTANCE: according to the method designed grid of vertical wells is constructed with bottomhole below the formation bottom level and extraction of product from these vertical wells. In the above wells filed geologic survey is performed in order to define properties of the formation and extracted product and breakdown pressure. Out of a vertical well at least two horizontal wells are constructed in direction of another similar vertical well with their isolation up to horizontal section and the working face located at the distance not exceeding 10 m from the other vertical well, with further hydraulic fracturing of the formation to provide interaction between wells. At that vertical well for product extraction is equipped with a pump run down through the tubing string below the formation bottom and place of interaction with horizontal wells. Product is extracted with control over hydrodynamic level in the formation. More than one auxiliary ascending borehole is constructed from the existing horizontal borehole. These boreholes are drilled in different directions thus crossing vertical and cross fissures. Distance between ascending boreholes is in inverse proportion to oil saturation at the deposit section. Angle of slope for these boreholes is reduced up to 30° with increase of oil-saturated thickness. These boreholes are drilled from the borehole closest to bottomhole of the main horizontal borehole.

EFFECT: increased efficiency of oil displacement due to increased recovery of reserves in square area and cross-section.

2 cl, 2 dwg