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 and other materials from wells.

SUBSTANCE: method involves lowering production and filtering strings provided with circulation valve, flushing channels, shear plug and sealing bush in well; flushing the well; washing-in gravel filler; closing flushing channels with sealing bush provided with shear plug and used as cementing plug. Production string has smooth inner surface. Filtering string is connected to production string during filtering column lowering in well. After gravel filler washing-in the well is cemented. Cement grout is forced by means of sealing bush with shear plug up to shear plug landing onto thrust part of circulation valve and flushing channel closing. Then the shear plugs of sealing bush and circulation valve are sheared. Well flushing, gravel washing-in and cement grout supply are carried out via flushing channels of circulation valve.

EFFECT: increased efficiency due to possibility to perform simultaneously several operations and reduced well diameter.

2 cl, 1 ex, 1 dwg