DEVICE FOR MULTIPLE DRILLING-IN OF PRODUCING FORMATIONS FROM SINGLE PARENT HOLE Russian patent published in 2003 - IPC

FIELD: mining industry, particularly, methods and equipment for construction of multiple holes. SUBSTANCE: device has body rigidly connected with branch pipe provided with landing place for removable deflecting tool and having recess for key; removable deflecting tool with orienting retainer made for regulation of direction of deflecting plane of removable deflecting tool and having key engageable with branch pipe recess and sub. Device body is made in the form of longitudinally corrugated tube plugged from lower side, and sub installed from other side connecting it with branch pipe and provided with bushing from easily drilled material for connection with process string. Branch pipe landing place is made in the form of inclined surface passing into longitudinal recess for key installed in landing bushing of orienting retainer. One of surfaces of landing bushing corresponds to landing inclined surface of body branch pipe, and the other surface has toothed surface of supporting bushing rigidly secured to shaft of orienting retainer. In this case, landing bushing is made for turning on retainer shaft and locking in toothed joint with supporting bushing by means of clamping bushing threaded with orienting retainer shaft. Removable deflecting tool is made for regulation of depth of installation in well by means of changeable extension located between orienting retainer and removable deflecting tool. Invention provides for drilling of one or more branch azimuth-directed holes due to accurate installation of removable deflecting tool. EFFECT: higher efficiency of using. 3 c;, 10 dwg