FILTERING DEVICE FOR WELL CLEANING Russian patent published in 2020 - IPC E21B43/08 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil and gas industry and can be used in liquid cleaning in the well bore from floating garbage and suspended particles. Device includes a central branch pipe with a filtering section, which is run in from the outside to the cylindrical bottom, fixed on the pipe below the filtering section, from the outside by means of a pulling member or a pipe string, and a valve installed inside the nozzle above its filtering section. Between the branch pipe and the housing there is a sleeve with an upper blind cover connected tightly to the branch pipe above its filtering section. Sleeve is equipped with holes not passing coarse waste. Lower edge of the sleeve is installed at a distance from the bottom of the housing, which is determined empirically for collection of large garbage without getting into the filtration section of the branch pipe. In the branch pipe above the valve and the bottom of the housing, there are corresponding drain channels uniformly along the perimeter, which do not allow passing large refuse.

EFFECT: enlarging functional capabilities due to two-step cleaning, increasing ease of maintenance.

3 cl, 1 dwg