HOLE FILTER Russian patent published in 2002 - IPC

FIELD: equipment for extraction of products from a hole, in particular, hole filters for filtration of the product extracted from oil, water and gas holes. SUBSTANCE: hole filter has a perforated pipe and head-pieces with holes made in the from of trapezoidal grooves-slots or truncated cones fastened on the pipe outer surface and matched with its holes, the holes of the pipe and head- pieces are arranged in a spiral, and the communication ducts-holes are made tangentially relative to the pipe outer surface in a circumference. EFFECT: changed direction of gas (liquid) flow round the obstacle arising at movement of the hole product in the filter zone in the horizontal section of the hole, enhanced efficiency of plant operation which prevents deceleration of product flow and reduction of discharge. 6 dwg