FIELD: borehole drilling. SUBSTANCE: method includes making principal pit, lining it with metal tubes of protective casing and flow string. Protective casing is installed above productive stratum and flow string is fixed by way of deepening casing tubes into productive stratum to predetermined depth, after which horizontal section of borehole is made using open-cut method with decreased-diameter trepan. EFFECT: increased reliability of process. 2 dwg
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