METHOD FOR TREATMENT OF FACE-ADJACENT SECTION OF BED OF HORIZONTAL WELL SHAFT AND DEVICE FOR REALIZATION OF SAID METHOD Russian patent published in 2004 - IPC

FIELD: oil extractive industry.

SUBSTANCE: method includes feeding working agent to limits of productive interval and its feeding into productive interval. Pumping into productive interval is performed with periodical repressive effect under excessive pressure of working agent. Before flow of working agent underpressure is created, repression effect is concentrated in direction of treated interval by paired and symmetric pressure output to treated interval at height, no less than perforation interval of treated interval. Pressure spreading in treated interval is limited up to its evening with pressure in well-adjacent area. Device has body in form of two connected cylinders, upper one of larger diameter and lower one of lesser diameter with safety valve, and plunger with solid ends. It is mounted in lower cylinder of body with possible reciprocal movement and exit into upper cylinder of body. Device is provided with tail piece and pressure concentrator, which are placed in series below safety valve. Pressure concentrator is made in form of pipe capped at lower section having apertures placed in pairs and symmetrically. In upper and lower portions cylinder is provided with larger and smaller shelves, between which packing glands are placed which cover spaces between larger shelves and well walls in case of pressure manifestation between packing glands. Distance between said glands is made no less than treated bed interval.

EFFECT: higher effectiveness of treatment of face-adjacent section in horizontal and slanted well shafts.

2 cl, 1 ex, 1 dwg