DEVICE FOR GENERATING HYDRAULIC PRESSURE IMPULSES IN A WELL Russian patent published in 2004 - IPC

FIELD: oil and gas extractive industry.

SUBSTANCE: device has driving assembly made in form of screw gear mechanism. Its stator has inner screw teeth. Rotor has outer screw teeth. Also provided is flow interrupter including a valve connected to rotor and a stopper with through aperture for flow of fluid. Valve is connected to stopper by means of shaft mounted inside the stopper. Device has dog mechanism including a dog rigidly connected to the shaft, and a pusher, connected to the rotor. Stopper has additional connecting aperture for flow of fluid with cross-section lesser than cross-section of through aperture, and located relatively to through aperture and a stopper in such a way, that when stopper turns, connecting aperture remains open at whole range of stopper turn angle, at which it covers the through aperture.

EFFECT: higher efficiency of hydrodynamic influence on a bed due to providing for stability and controllability of generated hydraulic impulses.

1 dwg