METHOD OF STRATUM OPENING Russian patent published in 2010 - IPC E21B43/263 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil producing industry, in particular - to methods for opening productive oil and gas strata by way of perforation with the help of explosives. The stratum opening method involves pumping a breakdown agent into the well as represented by a viscoelastic liquid whose time of relaxation after a deformation impact is equal to at least the period of hydropercussive wave action, perforator release, stratum perforation and well sealing. First one prepares the viscoelastic liquid mixing it with hollow glass microspheres whose mechanic strength exceeds bottom-hole pressure inside the well by 0.5-1 MPa in an amount of 10-30% of its volume and increasing its weight for the density to exceed the well fluid density by a factor of 1.1-1.2 which is then pumped into the well followed by release of the perforate on the pump and compressor pipes pre-equipped with a destroyable membrane and a fuse. Then one decreases the bottom-hole pressure inside the well to provide for generation of an influx from the stratum filling the pump and compressor pipes with lightweight fluid with the well sealing performed in the space behind the pipes with the help of a packer system.

EFFECT: improved efficiency of explosion works in deep wells combined with provision for protection against destruction of equipment inside the well positioned in proximity to the explosion zone.

3 cl, 2 dwg