TECHNOLOGY OF WELL CONSTRUCTION IN GEOLOGICAL STRUCTURES Russian patent published in 2000 - IPC

FIELD: technology of sinking of geological structures in construction of wells of various purpose with using drilling units and apparatuses self-contained in power supply and principle of application. SUBSTANCE: technology includes preparation of working site, selection of preventer design for process realization, equipment of wellhead and upper part of well, sinking of sedimentary and other rocks down to producing formation (oil, gas, water horizons, etc.), organization of mineral recovery. Broken rock from bottom hole is filled to wellhead by flow of outgoing working agent (gas, steam-gas mixture, etc.). Well walls are walled up with use of the same drilling unit by application to well walls and pressing of material of ascending flow of cuttings and gases to form protective shell of well wall. In sinking of well in insecure horizons, working agent pressure to well walls is increased. Drilling unit is periodically lifted in well section for its cleaning from drilling cuttings. The procedure is carried out by variation of conditions of action on bottom hole and well walls due to redistribution of forces directed onto bottom hole, walls and wellhead from drilling unit. EFFECT: considerable increase in well drilling rate in nonuniform and complicated conditions in geological structures. 4 cl, 4 dwg