FRAMELESS BOREHOLE FILTER Russian patent published in 2016 - IPC E21B43/08 

FIELD: oil industry.

SUBSTANCE: invention relates to oil and gas industry and can be used in production of gas and oil. Device includes two nipples, at least one slot-hole filtering element between limiting rings, made of wire which is reeled up on the longitudinal elements along the spiral. Both of the nipple are welded to limiting rings. Cross section of wire which is reeled up along spiral is executed as triangular, one of wire faces is executed parallel to longitudinal axis of the filter and connected to lengthwise elements, and two lateral angle form calibrated clearance.

EFFECT: filter capacity, reliability increases, abrasive wear decreases.

16 cl, 28 dwg