FILTERING WELL CONSTRUCTION METHOD Russian patent published in 2007 - IPC E21B43/04 

FIELD: mining, particularly construction of underground leaching wells, water or another fluid production wells and to prevent sand production during well completion.

SUBSTANCE: method involves lowering downhole screen connected to flushing pipe provided with flushing bush in well; inwashing gravel filling; removing washed-out particles and pumping well before well operation. Flushing bush has telescopic valve and radial channels, as well as closed central channel formed in lower part thereof. Removal of washed-out particles and well pumping is carried out through well chamber when the valve is installed in upper position and radial channels of flushing bush are communicated with well hole annuity and when the valve is in lower position and radial valve channels are communicated with downhole screen correspondingly.

EFFECT: increased efficiency of drill cuttings and formation sand removal and natural filter forming.

2 cl, 1 dwg