METHOD AND DEVICE TO GENERATE PRESSURE OSCILLATIONS IN FLUID FLOW Russian patent published in 2012 - IPC F15B21/12 F15D1/02 F15C3/16 

FIELD: oil and gas production.

SUBSTANCE: proposed method consists in intermittent feed of displacement fluid via two working ducts in common outlet manifold furnished with hydraulic cylinder with two pistons coupled by rod. Two openings are made in hydraulic cylinder wall to communicate with appropriate working duct. One piston is fitted inside hydraulic cylinder between said openings while another piston is arranged in outlet manifold. Compression and expansion waves are created in said outlet manifold by reciprocation of said pistons. Distribution of fluid flows between two working ducts is effected by feeding flat jet onto flat wedge arranged at definite distance from slot nozzle facing the flow. This invention differs from known designs in that pressure difference between working ducts is used to generate pressure pulses in outlet manifold.

EFFECT: optimised conversion of pressure difference in working ducts in that in outlet manifold.

3 cl, 2 dwg