METHOD OF ABRASIVE JET PERFORATION OF OIL, GAS AND GEOTECHNOLOGICAL WELLS Russian patent published in 2001 - IPC

FIELD: mining engineering; recovery of liquid or gas fluid media from wells, particularly, technology of well perforation. SUBSTANCE: method involves delivery of abrasive and fluid medium to well, their mixing, formation of jet of fluid medium with abrasive and jet direction to well walls. Delivered to well are abrasive and compressed gas in separate vessels. Vessel for abrasive is connected with gas vessel. Gas is supplied at pressure exceeding hydrostatic one in well by a factor of 1.5-3. Compressed gas is mixed with abrasive and obtained mixture is accelerated in nozzle to transonic velocities. Claimed technology of abrasive jet perforation features high productivity, formation of deep holes in well walls and in deep wells. EFFECT: increased or restored production rate of producing oil, gas and geotechnological wells. 4 cl, 2 dwg