METHOD FOR DRILLING-IN Russian patent published in 1994 - IPC

FIELD: oil industry. SUBSTANCE: producing formation is drilled through. Injected into bottom hole formation zone is compound containing, mas. % : sodium silicate 3.0-10.0; chalk-containing substance 3.0-15.0 (in terms of calcium carbonate); water - the balance. Used as chalk-containing substance is chemically precipitated chalk or chalk-containing waste of precipitate production, or chalk- containing waste of nitrogen production. Chalk-containing substance is used with content of calcium carbonate particles at least 20% by mass. Particle sizes are smaller than effective pores of rocks of bottom hole formation zone. Casing string is lowered, cemented and perforated. Washing is effected, and 20 h later acid treatment is applied. EFFECT: higher efficiency. 2 tbl