| 摘要 |
A seal assembly for a nested dual drill pipe includes a drill pipe member, such as a tube or drill pipe segment, having a female seal assembly (18, 118) and a male seal assembly (16A, 116) at the longitudinal ends thereof. The female seal assembly includes a larger internal diameter portion (18E), a taper (18E1) adjacent thereto, and a smaller internal diameter portion (18F) adjacent to the taper. The male seal assembly includes a smaller external diameter portion (16G), a seal area or groove (16F) adjacent thereto, and a larger external diameter portion (16E) adjacent to the seal groove. The smaller internal diameter portion and the larger external diameter portion have diameters selected to enable free longitudinal movement of the male seal assembly into the female seal assembly while limiting axial displacement to maintain a seal ring (38) in the seal area or groove fully energized. |
