METHOD FOR BUILDING A FILTERING WELL Russian patent published in 2006 - IPC E21B43/04 

FIELD: mining industry, possible use for constructing water-suction, oil and gas wells for underground lixiviation of wells.

SUBSTANCE: in accordance to method, well borehole is cleaned. Filter-adjacent zone is expanded. Filtration column is installed in productive zone of well, aforementioned column including pipe, filtration cover with triangular rods, which are inserted at sharp angle into external grooves, made in supporting rings. Legs of triangular rods are mounted along tangent to external diameter. Triangular rods form longitudinal channels with one-sided expansion between each other. In supporting rings internal grooves are made, forming longitudinal bypass channels together. Well is washed, simultaneously pouring in gravel with dimensions of fractions ranging from 0,5 to 10 mm. Agent being filtered is drained through longitudinal channels in annual flows, coinciding with expansion of longitudinal channels.

EFFECT: formation of stable strong structures around well filter.

1 ex, 2 dwg