СПОСОБ СТРОИТЕЛЬСТВА СКВАЖИН

摘要

FIELD: oil production industry, particularly for well construction. ^ SUBSTANCE: method involves drilling hole from under conductor string to productive formation roof; lowering and cementing protective string; performing primary productive formation exposing along with bottom-hole pressure control; lowering liner and cementing thereof; performing secondary productive formation exposing. Protective string comprises stage cementing collar. Protective string is cemented from string bottom to collar installation depth. Circulation collar orifices are opened. Upper protective string part is flushed. Bottom-hole pressure control is carried out by creating hydraulic resistance by supplying flushing liquid from well head from space defined by conductor string and protective string into space between protective string and drilling pipes and then in reverse direction to well head along with feeding flushing liquid injected through drilling pipes with flushing liquid supply rate regulation. The flushing liquid is supplied via circulation orifices of the collar. ^ EFFECT: increased efficiency.