METHOD FOR SECONDARY PRODUCTIVE FORMATION EXPOSING BY SLOT HYDRAULIC JET PERFORATION AND WELL PUTTING IN OPERATION Russian patent published in 2006 - IPC E21B43/114 E21B43/22 

FIELD: oil and gas industry, particularly oil and gas production with the use of perforators using direct fluid action, for instance abrasive jets.

SUBSTANCE: method involves performing full-waveform logging along with full wave signal recording in digital form; detecting place and number of cuts performed by hydraulic jet perforation along formation height. Bottomhole assembly includes hydraulic jet perforator, pressure test unit having socket for drop ball receiving, pipe string with measuring band connected to the first clutch and provided with cut marks, as well as reference connection pipe. Above components are arranged in bottom-up direction. Pipe string provided with equipment is lowered in well so that perforator reaches level of lower cut, which is the first from bottom. Then the first slot-like cut is formed in two stages by supplying abrasive liquid to perforator. At the first stage perforation is carried out under working pressure of up to 20 MPa for not more than 25 min. Just after that the second stage perforation operation is carried out under working pressure of up to 30 MPa for not more than 20 min. Above operations are fulfilled for each cut. After the last cut perforation channels of hydraulic jet perforator nozzles are closed and perforator valve assembly is opened. Slot-like channels are cleaned of sand. Perforator is lowered to well bottom and well is flushed until clean formation water appears. Then inflow stimulation liquid in injected into perforation interval and into area located 50-100 m over the perforation interval and repeated full-waveform logging of the inflow stimulation liquid is executed along with full wave signal recording in digital form. Perforator is lifted to day surface. After than immersed pump or equipment for flowing well operation are lowered in producing well or working agent injection equipment is lowered in injection well. Inflow stimulation liquid is removed from well bore and the well is brought into operation.

EFFECT: increased efficiency of secondary productive formation exposing.