| 摘要 |
<p>A cased wellbore extends to a pay zone produced by a rod actuated pump (10) that lifts fluid from the bottom of the wellbore up through a tubing string (26) to a wellhead. The pump is seated in a pump cavity, and the tubing string is tensioned and is rotated. The upper end of the tubing string is attached to a fluid conveying swivel means (24) and a tubing rotator (22). A combination tubing anchor (34) having a fluid conveying rotatable mandrel (35) is attached to the lower end of the tubing string by which the lower end of the tubing string is rotatably and releasably affixed to the casing (20). A plurality of radially active slips (45) are actuated in response to manipulation of the tubing string to extend the slips into engagement with the casing and to retract the slips to remove the tubing string from the borehole.</p> |
