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Latest Inventions  Prospecting, production activity and waste handling of minerals Prospecting and output METHOD OF SECONDARY TAPPING OF OIL AND GAS WELL PRODUCING FORMATIONS
METHOD OF
SECONDARY TAPPING OF OIL AND GAS WELL PRODUCING FORMATIONS
 FIELD:
drilling and repair of producing wells, particularly, secondary tapping of
producing formations.
SUBSTANCE: method includes perforating of cased
main wellbore by cutting out of windows in casing string and tapping of
producing formation in its bottomhole zone by drilling through windows of radial
perforation channels with bypassing the boundaries of levels of gas-water, gas-
oil, water-oil interproduct contacts. Said radial perforation channels are
drilled with departure from main wellbore ensuring tapping of all producing
interlayers of formation and subsequent stimulation of formation product inflow
to well. Before drilling of radial channels from main wellbore, injected to
bottomhole zone through perforations holes in casing string is isolating-binding
gel-forming or cement slurry to depth less than distance of departure of these
channels from main wellbore but larger than existing or prognosticated depth of
spreading of boundaries of levels of interproduct contacts. Formed in drilling
of radial perforation channels are curved wellbores including descending and
ascending and ascending branches.
EFFECT: higher efficiency. 2 cl, 2 dwg, 1 ex
Akchurin Kh.I., Shamov
N.A.
Patent number: 2212525
Publishing date: October 14, 2003
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