METHOD OF BOREHOLE PERFORATION Russian patent published in 2012 - IPC E21B43/11 

FIELD: oil and gas production.

SUBSTANCE: method of borehole perforation includes descending of perforator in the borehole and perforation process. After descending into the borehole the perforator is fixed to prevent turning and shifting. Perforation is performed in fixed condition, after perforation the perforator is elevated from the borehole, equipped by charges and repeatedly descended into the borehole. After repeated descending the perforator is fixed in the borehole in position it was in after the first descending, repeated perforation is done in fixed condition. After the repeated perforation the perforator is elevated from the borehole. The perforation is repeated if necessary.

EFFECT: invention allows combining the places of cumulative perforation action at the second and the following perforation cycles with the place of perforation action at the first perforation, changing the form, extending and deepening perforation holes in the borehole, reducing the negative effect on annulus cement stone at reaching borehole connection with annulus area.

3 cl, 4 dwg, 3 ex