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A cased wellbore extends downhole to a pay zone which is produced by a rod actuated downhole pump that lifts fluid from the bottom of the wellbore up through a tubing string to a wellhead. The pump is seated in a pump cavity. The tubing string is tensioned and is rotated. The upper end of the tubing

A cased wellbore extends downhole to a pay zone which is produced by a rod actuated downhole pump that lifts fluid from the bottom of the wellbore up through a tubing string to a wellhead. The pump is seated in a pump cavity. The tubing string is tensioned and is rotated. The upper end of the tubing string is attached to a fluid conveying swivel means and a tubing rotator. A combination tubing anchor and fluid conveying swivel is attached adjacent the lower end of the tubing string by which the lower end of the tubing string is rotatably and releasably affixed to the casing in proximity to the lower end of the wellbore. The lower swivel is located adjacent the anchor and enables the tubing string to rotate respective to the anchor while conveying fluid through the rotating tensioned production tubing string.

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In a production unit for a cased wellbore having a wellhead and a rod actuated downhole pump for producing fluid up a tubing string to the surface of the ground, the combination with said production unit of apparatus for rotating the tubing string while holding the tubing string in tension; said app

In a production unit for a cased wellbore having a wellhead and a rod actuated downhole pump for producing fluid up a tubing string to the surface of the ground, the combination with said production unit of apparatus for rotating the tubing string while holding the tubing string in tension; said apparatus includes a tubing rotator by which the upper end of the tubing string is rotatably supported from the wellhead; a downhole tubing swivel connected at the lower end of the tubing string; an anchor device by which a lower end of the tubing swivel is anchored to the casing string; said downhole tubing swivel has a mandrel connected to said anchor device, a rotatable top sub that is connected to a J-pin retainer sub and rotates respective to the mandrel; journal means by which said rotatable top sub and tubing string rotates respective to said mandrel and anchor device; a J-pin in said J-pin retainer sub, a J-slot and a circumferentially extending groove in said mandrel engaged by said J-pin such that when the tubing string is set down the J-pin travels into the J-slot and locks the mandrel to the J-pin retainer sub which imparts rotation into the mandrel when the upper end of the tubing is rotated, and when the J-pin is lifted from the J-slot into the circumferentially extending groove, the J-pin travels in the circumferentially extending groove as the tubing string is rotated, whereby: the tubing string, top sub, and J-pin retainer rotate respective to said mandrel and anchor device. In a wellbore having a rod actuated downhole pump for producing fluid up a tubing string to the surface of the ground, a wellhead at the top of the wellbore, an anchor device by which a lower end of the tubing string is anchored to a lower end of the wellbore to place the tubing string in tension; a method of reducing wear between a sucker rod string and the interior wall of the tubing string through which the rod string extends, comprising the steps of: rotatably connecting the lower end of the tubing string to said anchor device by interposing a tubing swivel between said tubing string and said anchor device, connecting the upper end of the tubing string to a tubing rotating means and supporting the tubing rotating means from the wellhead; locking the tubing swivel that is located at the lower end of the tubing string and extending said anchor device into attached relationship respective to the wellbore wall by rotating the tubing string in one direction; unlocking the last said swivel and placing the tubing string in tension by using the tubing rotating means to pull the upper end of the tubing string uphole and using the last said tubing swivel to pull the lower end of the tubing string downhole; rotating the tubing string from the surface while conveying fluid through the tensioned rotating tubing string; releasing the anchor device by locking the tubing swivel and rotating the tubing in the other direction.