METHOD FOR DRIVING WELL IN HIGH-PENETRABLE GAS-SATURATED COLLECTORS Russian patent published in 2004 - IPC

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes pressurization of well mouth, destruction of rock with straight washing by washing fluid along drilling column and by removing drilled out rock onto day surface, fixing moment of fall of mouth pressure and absence of output of washing fluid onto well mouth. Washing fluid is replaced with washing fluid with low amount of solid phase. Concurrently floating hydraulic lock is formed above ceiling of high-penetrable gas-saturated collector by means of pumping suspension having density less than 1000 kg/m³, containing liquid phase and filler. Height and density of floating hydraulic lock is determined from formula. As liquid phase of suspension, reverse hydrocarbon-water emulsion is used with viscosity of 150-300 mPa·s. As filler, gas-filled micro-spheres or expanded vermiculite is used. Mass portion of said emulsion, for one mass portion of said filler, is determined from formula.

EFFECT: higher efficiency, prevented complications.

3 cl, 1 tbl, 1 ex