DEVICE WITH COMBINED EFFECT ON PRODUCTIVE FORMATION AND BOTTOM-HOLE ZONE Russian patent published in 2016 - IPC E21B43/25 E21B28/00 F15B21/12 

FIELD: oil and gas industry.

SUBSTANCE: invention is related to the sphere of oil and gas producing industry, and namely to devices intended for use of combined wave technology on productive formations in order to increase hydrocarbon recovery. Low-frequency bistable oscillator for combined effect on productive oil formations with low frequency consists of a working chamber made as parallelepiped formed by lateral walls and the top and bottom walls, in which front wall there is a movable nozzle placed coaxially with longitudinal axis of the working chamber, and at the output there are two output tubes. At that length of one tube exceed length of the second tube per a value equal to distance defined by time of consumption (pressure) pulse passing from the camber to the bottom-hole zone. At that the removable nozzle includes two sections of channel; the initial one - input section - made as cylindrical cavity and output section with stepped increase in diameter of the cylindrical cavity and less length in regard to initial section of the nozzle in order to generate and to break high-frequency vortex in addition to the varying main low-frequency flow from the nozzle.

EFFECT: increased efficiency of impact on the formation with low frequency and treatment of the well bottom-hole zone from colmatant and impurities reducing intake capacity of the well, and increased productive capacity due to increased intake capacity of the injecting well.

2 dwg