METHOD FOR DEVELOPMENT OF WELLS AND WORKINGS IN ROCKS Russian patent published in 2012 - IPC E21B7/16 E21C37/16 

FIELD: mining.

SUBSTANCE: method includes destruction of rocks at face by impact of power tool and jets of working agent running out under pressure, removal of drilling mud to the well head by working gaseous agent reflected from the face. Face area is influenced with working gas agent under its temperature 700-900°C, agent jet pressure on the face 3-10 kgf/cm² during 1-2 minutes upon simultaneous appliance of acoustic vibrations from operating agent and drilling unit heads on these jets and creating the conditions for sections change-over on the face; by means of such influence 5-10 mm of rock layer are weakened breaking its thermal and mechanical inertia; cooling agent is supplied to preheated face by short-time pulse during 1-3 sec with pressure 10-70 kgf/cm² in the form of carbonic acid or mixture of water with carbonic acid, form network of fractures or tiny fractures in this layer, upon impulse action on the face by working gas agent under pressure 50-100 kgf/cm² and temperature 600-800°C cooling agent residuals are vapourised, destroyed rock is removed from the face, constant upstream of drilling mud to the well head is created, choosing its lifting speed within 20-60 m/sec due to control of quantity from 2 to 9 m³/sec of gas flow supplied from thermo-gas generator to the part of working heads of drilling unit; after that the activities specified are repeated in the same sequence.

EFFECT: increasing effect of the method and efficiency of the drilling unit.

3 dwg