AUTOMATIC PRESSURE PULSER Russian patent published in 2003 - IPC

FIELD: oil producing industry; automatic pressure treatment and cleaning of wells by pulsing stimulation of formation, pressure differential and repressuring. SUBSTANCE: pulsar has bushing with longitudinal channels and movably located on hollow fixed rod provided with radial channels. Bushing fulfils functions of inlet and equalizing valves performing successive closing of body channels and opening of rod channels producing alternately pressure differential and repressuring actions on formation with help of hydraulic braking times connected with hydraulic drive. Bushing is rigidly connected with hydraulic drive rod. Hydraulic drive cylinder is connected with system of pipelines communicating with zones of external and intrapipe pressures. Cylinder is connected with reversing cock ensuring change of direction of flow of annular space fluid for reciprocation of hydraulic drive piston. Cocks starting the hydraulic drive and equalizing pressure in it provides for switching-on of pulsar in automatic regime and are engageable with packer rod. EFFECT: provided complete automation of periods of differential pressure and repressuring of well formation without action of operator from surface. 3 dwg