DOWNHOLE FILTER AND ITS CLEANING METHOD Russian patent published in 2020 - IPC E21B43/08 E21B37/08 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to oil and gas industry, specifically to means of oil and gas filtration. Downhole filter comprises nipples, a coupling and a filter element with stringers laid parallel to the axis of the downhole filter between the limit rings, and coils of profiled wire wound on them, inner core installed inside filtering element, external cylinder in the form of a flat spiral with stringers laid on it, made of elastic material, two cross pieces: lower and upper, installed inside the limit rings. High-pressure cylinder with BRS union is connected to the upper crosspiece. Inner rod is connected with lower crosspiece by rigid connection, and with upper crosspiece with possibility of inner rod sliding along sliding fit. Stringers height is made from the following ratio: H₂=(2…5)δ₂, where H₂ is stringer height, δ₂ is thickness of outer cylinder.

EFFECT: reducing weight, increasing bending strength while maintaining torsional strength; providing efficient cleaning.

9 cl, 23 dwg