FRAMELESS BOREHOLE FILTER Russian patent published in 2017 - IPC E21B43/08 

FIELD: oil industry.

SUBSTANCE: invention relates to oil and gas industry and can be used in production of gas and oil. Filter comprises two nipples and at least one filter element, protective jacket with holes, and arranged between limiting rings. Each filter element is placed on longitudinal elements, and both nipples are welded to extreme limiting rings. Inside filter without annular gap there is a circular casing, inside of which with an annular gap is installed means of swirling produced product. Filter element can be meshed. Filter element can be made in form of one filter mesh and two drain meshes, arranged concentrically.

EFFECT: higher filter capacity, reduced weight, possibility of cleaning filter.

28 cl, 30 dwg