| 摘要 |
<p>TITLE: DYNAMIC SEAL FOR WELL TOOLS A dynamic seal for use between reciprocal concentric tubular members is disclosed herein and is especially adaptable for use in providing a dynamic seal between a movable piston and a sleeve in a downhole oil or gas well tool, such as a safety valve, a hydraulically actuated packer or a sliding sleeve. Each dynamic seal assembly comprises an elastomeric T-seal with cylindrical backup members positioned on either side of the central tip section of the seal member. The elastomeric T-seal is received within a central annular groove and a seal receptacle and the backup members are positioned within recessed ledges on opposite sides of the central groove. The backup members provide extrusion resistance for the tip section of the dynamic T-seal and overlap the T-seal to hold the seal in place. The cylindrical members are also positioned between the recessed ledges and the polished sealing surface of the other tubular member to support any radial forces so that a uniform load or squeeze is applied to the elastomeric T-seal member.</p> |
