METHOD AND DEVICE FOR DEEP WELL PERFORATION Russian patent published in 2007 - IPC E21B43/112 

FIELD: oil and gas production industry, particularly equipment to create long perforation channels extending, for instance, outwards mudding zone.

SUBSTANCE: method involves lowering device connected to logging cable in well within predetermined perforation interval; fixing device on well wall with the use of corresponding module; moving device drive module to fixing module; extending revolving flexible shaft provided with cutting tool from guiding channel along with providing stored potential energy return in the device; delivering well liquid with the use of flushing pump through hollow rod to cutting tool; perforating the well by axial flexible shaft movement with advance force; returning flexible shaft with cutting tool in initial position at the end of well perforation operation; releasing the device in predetermined well perforation point and relocating the device to another well point for new perforation channel drilling. Device comprises drive module, fixing module, connection rods, flexible shaft, flushing pump, cutting tool and device motion converter. Drive module is moved towards fixing module secured in well bore by means of tightening unit. Connection rods transmit tightening force to return means to accumulate potential energy. The stored potential energy provides pulling apart of both modules and flexible shaft return in initial position. The flexible shaft is hollow.

EFFECT: increased method efficiency and device reliability due to controllable advance force and twisting moment acting on hollow flexible shaft.

23 cl, 4 dwg