FIELD: oil and gas production.
SUBSTANCE: present invention aims to create the zone of programmed pressure near bottom-hole assembly with drilling bit by means of sealing installation near bottom-hole assembly, pressure adjustment approximately at the level or insignificantly lower than the threshold pressure of bottom-hole zone surface for provision of influx from the stratum, and adjustment during drilling by means of pumping from bottom-hole assembly or fluid supply restriction into bottom-hole assembly between the zone at programmed pressure and annular space of well bore to prevent overbalance pressure in the zone at programmed pressure, if it is not required for well control.
EFFECT: invention allows combining overbalanced drilling for minimisation of risks usually connected with underbalanced drilling with drilling advantages in the zone of programmed pressure and overbalance.
30 cl, 34 dwg
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