SECTOR METHOD FOR VERTICAL SLOT HYDROSANDBLAST PERFORATION OF WELL AND DEVICE FOR ITS REALISATION (VERSIONS) Russian patent published in 2009 - IPC E21B43/11 

FIELD: oil and gas production.

SUBSTANCE: group of inventions is related to oil and gas industry, namely, to methods and devices for hydrosandblast perforation of wells. Sector method of vertical slot hydrosandblast perforation of well includes formation of perforation channel on one vertical axis in casing pipe, cement layer, complex-stressed well bore zone and payout bed by abrasive hydraulic jet that flows out of extension nozzle directed at the angle to well wall. Extension nozzle in process of perforation is displaced in vertical plane higher up or down, gradually changing direction of jet, which was originally directed up or down at the angle of 45 degrees to well wall to position, when jet direction is changed, and it is sent accordingly down or up at the angle of 45 degrees. After working pressure drop nozzle is returned in initial position, and perforator is shifted up or down.

EFFECT: improved efficiency of slot hydrosandblast perforation, height and depth of perforated channel of payout bed.

10 cl, 9 dwg