STRAINER FOR WELL IN UNDERGROUND GAS STORAGES Russian patent published in 2013 - IPC E21B43/08 

FIELD: oil and gas industry.

SUBSTANCE: device consists of a body with bands at the ends that cover final turns of a wire forming an outer screen wound onto stringers located at exterior surface and spaced equally along the perimetre thus forming a filtering slot. Inside the body there are at least two circulating holes covered by casings. The body is equipped with at least two collars installed above casings and under location of circulating holes. Casings are equipped with holes and process grooves at exterior surface. In grooves there are one-way cup-type valves which are capable to cover holes located at the level of circulating holes in the body.

EFFECT: expansion of technological capabilities for a strainer, higher efficiency.

4 dwg