METHOD OF MULTIPHASE MUDDING OF PRODUCTIVE STRATUM Russian patent published in 2004 - IPC

FIELD: oil and gas production.

SUBSTANCE: method is intended for use at primary boring-assisted exposing of productive oil strata to increase their productivity, after secondary exposing and development, and at killing of wells for overhaul operation before performing geotechnical measures. In the method of mudding of oil-saturated rocks with clay drilling mud weighted with chalk and containing emulsified oil phase with dispersed phase herein, formed by introducing air into drilling mud after it was pumped into hole, content of indicated oil phase is 10 vol %, air is introduced in amount of 10-15%, and, which is additional feature of the invention, excess of hydrostatic pressure with respect to formation pressure is achieved by deepening well.

EFFECT: increased mudding efficiency.

2 cl, 1 tbl