FIELD: oil and gas well drilling, particularly well drilling with deflecting the direction thereof.
SUBSTANCE: method involves drilling main and additional unidiameter boreholes without borehole reaming with the use of drilling assembly, which provides zenith angle of not less than 90° and has whipstock or bent sub; drilling additional borehole from the main borehole face; enlarging the main borehole in intervals with the use of straight assembly. Additional boreholes may be bored in vertical and horizontal directions. Additional borehole azimuths may be pulled apart in opposite directions.
EFFECT: reduced material consumption and time inputs due to usage of assemblies of only two types, increased filtration area and formation drainage area.
3 cl, 2 dwg
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