FILTERING WELL CONSTRUCTION METHOD Russian patent published in 2006 - IPC E21B43/04 E21B33/14 

FIELD: mining, particularly methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells.

SUBSTANCE: method involves drilling and reaming well bore; lowering filtering column connected to production string in reamed well bore section, wherein filtering string comprises filtering and blind parts, circulation valve with flushing channels and shutoff bush; lowering injection string with distribution unit and shutoff bush control mechanism in reamed well bore section; flushing the well; washing-in gravel filler and cementing the well. Dowels for flushing channel closing are created on shutoff bush. To close flushing channels the shutoff bush is installed on outer surface of circulation valve over blind part of filtering column so that dowels project out of flushing channels of circulation valve. Control mechanism is of bayonet type. Before gravel filler washing-in control mechanism is connected with shutoff bush by means of dowels and is displaced by flushing channels opening. Gravel filler is washed-in in annular zones defined by filtering and blind filtering column parts and reamed well bore section. Cement mortar is initially supplied to annular zone defined by circulation valve and reamed well bore section and after reamed bore section filling cement mortar is delivered in upward direction along hole annuity. Then shutoff bush is displaced and flushing channels are closed.

EFFECT: increased efficiency and reliability of technological well construction operations.

1 ex, 1 dwg