PROCEDURE FOR BASIN BOTTOM ANTI-FILTER SCREENING Russian patent published in 2011 - IPC E02B3/16 

FIELD: machine building.

SUBSTANCE: flow (29) of suspension is directed to appointed place via flexible pipeline. Flexible pipeline (12) has a tip (13) in form of a rigid pipe with an outlet nozzle or group of nozzles (15). Nozzles (15) are directed in different sides from axis (16) of tip (13). Length of the tip exceeds depth of basin (7) at appointed place of bottom (9). Shape of tip (13) when imposed with axial pressure facilitates immersion of nozzles (15) into sediments (6) of bottom of basin (9). Tip (13) is connected to flexible pipeline (12) by means of metal insertion (14). Insertion (14) contains valve (17) and pressure gauge (18) with valve (19). Nozzles (15) are protected with element (20) from mechanical damage. Tip (13) is lowered to bottom (8) successively in holes (21) made in ice at specified distance. Also, diametre of each hole (21) ensures lowering of tip (13) into well (21) to two arms (22), if necessary. Axial pressure is imposed to arms (22) and upper end (23) till immersion of nozzles (15) into sediments (6) at specified depth. Further, suspension is supplied under pressure and at specified volume. Screen (25) is made by layer-after-layer sediments (6) piling. Sediments are enriched with suspension from adjacent holes (21) at stirring-up. Average thickness of screen (25) depends on volume of stirred-up sediments (6) and distance between holes (21). Volume of sediments (6) depends on depth of nozzle immersion (15), angle of attack of sediments (6) with suspension jet (24) and radius of gradual cone of washout (26).

EFFECT: accelerated formation of screen, increased uniformity of mud distribution and density of sediments in screen.

8 cl, 2 dwg