| 摘要 |
<p>A hydraulic setting tool for packers comprises a case (28) with a ball valve (140) therein, a bypass passageway (202) for bypassing around the ball valve when the ball valve is in a closed position, a fill valve (210) for closing the bypass passageway when desired, and a packer setting sleeve (270) for hydraulically setting a packer attached below the setting tool. The fill valve is preferably characterized by a sliding sleeve valve annularly disposed on a stationary mandrel (144) in the case and is movable in response to a pressure in the tool. The packer setting sleeve is attached to a setting piston which may be actuated in response to a first differential pressure between the tool string and a well annulus. A slidable mandrel (62) is provided in operative association with the ball valve and is movable in response to a second differential pressure between the well annulus and the tool string. The second differential pressure also acts to raise the setting piston and setting sleeve to a retracted position spaced away from the packer.</p> |
