Automatic pressure reduction means of sleeve pipe gas

The utility model relates to an oil gas well mining devices specifically says to relate to an automatic pressure reduction means of sleeve pipe gas. The utility model discloses a top connection, center tube and outer seating nipple wherein, the outside of top connection lower extreme links to each other with outer seating nipple one end, the inboard of top connection lower extreme links to each other with the center tube upper end, the outer seating nipple other end is provided with annular valve base with the center tube other end, outer seating nipple inner wall forms annular internal cavity with the center tube outer wall, is provided with the annular single current valve with annular valve base matched with in this annular internal cavity. Annular single current valve through setting up in annular internal cavity uses with annular valve base's cooperation, has realized the automatically regulated to casing pressure, has solved the influence of sleeve pipe gas to oil pumping system efficiency, simultaneous