Patent ID: 6371487
Filing Date: 2002-04-16
Classification: E21B,F16J

Abstract:
A seal and gimbal system for use in a drivehead of a downhole rotary pump, which pump is operated by a drive string suspended from the drivehead for rotation in a production tubing about a longitudinal axis, the drivehead having a bore in fluid communication and coaxial with the production tubing and sized to permit the passage of a polished rod attached to a top end of the drive string, the seal and gimbal system for sealing an annular space between the production tubing and polished rod from the drivehead, comprising:a top seal assembly fixed and sealed to the polished rod and rotatable with the polished rod; a gimbal assembly operatively connected to the top seal assembly and rotatable with the top seal assembly, the gimbal assembly having first and second portions enabling pivotal displacement of the first and second portions with respect to one another during rotation of the polished rod and a gimbal seal between the first and second portions; a bearing assembly operatively connected to the gimbal assembly enabling rotation of the gimbal assembly and the polished rod with respect to the drivehead; and, a lower seal assembly operatively connected to the bearing assembly for providing a seal between the bearing assembly and annular space.