DEVELOPMENT OF MINOR OIL DEPOSITS Russian patent published in 2014 - IPC E21B43/20 

FIELD: oil-and-gas industry.

SUBSTANCE: proposed method comprises drilling of exploration wells, research, refining of deposit sizes, trial operation and construction of geological hydrodynamic model, additional pay drilling, oil extraction via production wells and injection of working agent via injection wells. In compliance with this invention, at drilling of exploration wells vertical test, exploration and operation wells are drilled so that they can be transformed for injection of working fluid. Conditional lines run through test and exploration wells and through exploration and operation wells make the angle of 30 to 180 degrees to ensure maximum coverage of the deposit by said wells. Drilling data thus obtained are used to construct a geological hydrodynamic model to define the length, operating parameters and number of operation wells provided that one horizontal well allows extraction of at least 25000 tons of recoverable oil deposits. Horizontal operation wells are bored. Horizontal shafts of operation wells are located at 45 to 90 degrees to larger axis of the deposit and at 30-60 degrees to direction of prevailing fracturing and at equal distance from vertical wells. During trial operation, vertical wells are changed over to injection of working fluid after drilling of horizontal operation wells.

EFFECT: higher oil recovery factor at development of minor oil deposits at exploration stage.

2 cl, 3 ex, 2 dwg