DEVICE FOR IMPACT ACTION UPON OIL BED Russian patent published in 1998 - IPC

FIELD: oil production industry. SUBSTANCE: this is intended for subjecting oil bed to elastic vibrations during oil production. Device has anvil and striker located in pipe string, with hermetic space created between them. Power drive for moving striker upwards is made in the form of plunger, and its cross-sectional area is larger than cross-sectional area of striker. Space between plunger and striker is connected with space of oil well. Plunger is provided with catch for gripping catch head of striker. At pressure increase in well, also increased is pressure in space between plunger and striker and they move upwards under action of force differential. When catch rests against limiting ring, it is released and striker due to pressure differential falls on anvil. Impact is transmitted through liquid in well to productive oil bed. Device reduces probability of mechanical destruction of well down-hole zone, increases impact loads, simplifies lifting of striker to extreme upper position. EFFECT: higher efficiency. 1 cl, 1 dwg