FIELD: cleaning water from mechanical impurities. SUBSTANCE: filter is mounted on casing string at wellhead; proposed filter has housing, inlet and outlet sludge branch pipes, cover and filter element. Filter is provided with cylinder located inside housing at spaced relation; flow shut-off valves freely fitted one on other are mounted on its end face located on side of liquid inlet; housing is provided with swirler mounted in its upper portion; filter element is located in lower portion of cylinder. EFFECT: simplified construction; reduced usage of materials; increased period between flushing. 3 dwg
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