HYDRODYNAMIC PULSED-PRESSURE GENERATOR Russian patent published in 2003 - IPC

FIELD: oil producing industry; applicable in cleaning of bottomhole formation zone and increase of well productivity with use of hydrodynamic fields. SUBSTANCE: pulsed-pressure generator consists of body with windows, spring-loaded member closing body windows and installed for motion and separation of regions of constant and pulsed pressure, seat and shutoff member. Spring-loaded closing member is made in form of bushing installed for contact with seat. Shutoff member is made in form of spring-loaded piston located inside bushing. Body has lower cover above-piston cavity is communicated with constant pressure region, and under- piston cavity is communicated with region of pulsed pressure through damping hole and spring-loaded relief valve, both located in body lower cover. Spring- loaded relief valve is installed for regulation of hydraulic resistance. Bushing spring force is higher than force of piston spring. Seat inner diameter is smaller than that of bushing. Design of hydrodynamic pulsed-pressure generator provides for regulation by variation of force of resistance to longitudinal motion of valve, that alongside with availability of energy accumulator makes it possible to increase hydrodynamic pressure, and, respectively, depth of penetration of wave field into formation and provides for versatility and efficiency of use of pulsed-pressure generator in rocks with various reservoir properties. EFFECT: improved design. 2 cl, 6 dwg