FIELD: drilling for recovery of liquid fuel. SUBSTANCE: underground system of bore-holes has initial underground bore-hole passage driven to ground surface, and second bore-hole passage which can be drilled from initial bore-hole passage. First pipes of multiple-hole drilling arrangement can be located inside initial bore-hole passage. Second pipes of drilling arrangement can be located both inside initial bore-hole passage and inside second bore-hole passages. In addition, third bore-hole passage can be drilled from initial bore-hole passage, and first pipes can be installed in third bore-hole passage. Initial and second bore-hole passages can be driven through underground formations. Additional bore-hole passage or passages can be drilled from initial, second and/or third bore-hole passage so as to penetrate through underground formations. Second multiple-hole drilling arrangement can be used for drilling required number of additional bore-hole passages from second or third bore-hole passages. Liquid is recovered from underground formations to ground surface through initial, second, third and/or additional bore-hole passages and/or through casing outlet pipes and/or through pipes located inside them. Aforesaid underground system of bore-holes allows for drilling and construction of multiplicity of underground bore-holes at very different vertical depths, thus allowing for recovery of liquid mineral substances simultaneously from several underground formations. EFFECT: higher efficiency. 63 cl, 33 dwg
