FIELD: excision of pulses of pressure in certain points, cleaning of face zone of hole. SUBSTANCE: down- hole pulse source has two working chambers, two cylinders with differential pistons which are fixed in initial position by two ball locks. Intermediate chamber is connected to two cylinders. Motor is located in intermediate chamber. Ball locks release differential pistons in certain points of hole with the aid of two locking arms set in motion by motor with two output shafts linked to screws via clutches. Screws have different direction of thread. Down-hole pulse source also has two reflectors between which shock wave with negative pressure front is excited. EFFECT: enhanced efficiency of action on face zone of hole thanks to action of pulse on limited section of hole. 1 cl, 1 dwg
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