1results about How to "Improves seal integrity" patented technology

The application relates to a gas seal threaded joint structure suitable for SAGD thermal recovery well pipe string connection, which comprises a male end A and a female end B, the female end B comprises female threads E with a taper, a tool withdrawal groove, a female sealing surface G and a female shoulder J, the male end A comprises male threads C with a taper, a male sealing surface F and a male shoulder H; the female sealing surface G comprises a taper surface and a cylindrical surface, the taper surface is connected with the tool withdrawal groove, and the cylindrical surface is connected with the female shoulder J; the male sealing surface F comprises an arc surface, one end of the arc surface is directly or through a cylindrical surface connected with the male threads C, the cylindrical surface is tangent to the arc surface, and the other end of the arc surface is directly connected with the male shoulder; when the male end and the female end are screwed in place, the male threads C and the female threads E are engaged with each other, the female sealing surface G and the male sealing surface F are in interference contact through the taper surface and the arc surface to realize sealing, and the male shoulder and the female shoulder are mutually abutted. Under the complex working conditions of high-temperature circulation and internal pressure circulation of the pipe string, excellent sealing integrity and structural integrity are provided for the connection of the pipe string.