| 摘要 |
An improved tubing packer including a sleeve connected in the tubing string and having an outer diameter close to the inner diameter of the string into which it is to seal and a plurality of external grooves having pressure compensating material therein, a liner within the sleeve and spaced therefrom, pressure responsive means between said sleeve and said liner, the pressure responsive means and said sleeve having coacting multiple camming surfaces which coact to force the sleeve outward into tight gripping and sealing engagement with the interior of the well string and means for supplying a pressure fluid to the pressure responsive means. |
