FIELD: oil and gas field development, particularly well system to open access into underground zone from ground surface.
SUBSTANCE: method to provide access into underground zone 22 involves drilling inlet hole 15 from ground surface; forming at least two inclined bores 20 beginning from inlet hole; creating horizontal drain working 24 system extending from incline bores 20 into underground zone 22 and forming sump 27. The sump 27 is communicated with at least one inclined bore and is located under horizontal drain working system. The sump is created so that at least one liquid is drained from underground zone via horizontal drain working system and is accumulated in the sump to facilitate liquid removal from underground zone.
EFFECT: increased efficiency of underground deposit roof zone selection for gas and liquid draining along with enhanced drilling and production operations and decreased costs.
28 cl, 15 dwg
