Hydraulically Powered Fishing Tool and Method
AssigneeTIW Corporation
InventorBritt O. Braddick
Life of this patent
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Abstract
A hydraulically powered fishing tool is provided for retrieving another tool or tubular stuck in a well. A tool housing is supported in a well on a work string, and the housing encloses a plurality of pistons (16, 28, 34) each movable in response to pressurized fluid transmitted through the work string. An anchor (52) axially fixes the position of the tool in the well, and a tool mandrel (40) is axially movable relative to tool housing when the anchor is set. A fishing device (82) engages the another tool or tubular, so that axial movement of the mandrel in response to the plurality of pistons dislodges the stuck tool or tubular.
Claims19
A hydraulically powered fishing tool for retrieving another tool or tubular stuck in a well, comprising:
- a tool housing supported in a well by a work string and enclosing a plurality of axially stacked pistons generating a cumulative axial force, each of the plurality of pistons axially movable in response to pressurized fluid transmitted downhole to the tool on the work string;
- an anchor for axially fixing the position of the tool housing in a well, the anchor movable from a run-in position to a set position;
- a tool mandrel axially movable relative to the tool housing when the anchor is set;
- and
- a fishing device on a lower end of the tool mandrel for engaging the another tool or tubular, such that axial movement of the tool mandrel in response to axial movement of the plurality of pistons dislodges the stuck another tool or tubular.
A hydraulically powered fishing tool for retrieving another tool or tubular stuck in a well, comprising:
- a tool housing supported in a well by a work string and enclosing a plurality of axially stacked pistons generating a cumulative axial force, each of the plurality of pistons axially movable in response to pressurized fluid transmitted downhole to the tool on the work string;
- a slip assembly for axially fixing the position of the tool housing in a well, the slip assembly movable from a run-in position to a set position in response to axial movement of the plurality of pistons;
- a tool mandrel axially movable relative to the tool housing when the anchor is set;
- the plurality of axially stacked pistons including a plurality of inner pistons each secured to the mandrel and a plurality of outer pistons each secured to the tool housing;
- and
- a fishing device on a lower end of the tool mandrel for engaging the another tool or tubular, such that axial movement of the tool mandrel in response to axial movement of the plurality of pistons dislodges the stuck another tool or tubular.
A method of retrieving a tool or tubular stuck in a well, comprising:
- supporting a tool housing in a well by a work string;
- supporting a plurality of axially stacked pistons within the tool housing for generating a cumulative axial force, each of the plurality of pistons axially movable in response to pressurized fluid transmitted downhole to the tool on the work string;
- axially fixing the position of the tool housing in a well with an anchor, the anchor movable from a run-in position to a set position;
- axially moving a tool mandrel relative to the tool housing in response to the plurality of pistons when the anchor is set;
- and
- providing a fishing device on a lower end of the tool mandrel for engaging the tool or tubular, such that axial movement of the tool mandrel in response to axial movement of the plurality of pistons dislodges the stuck tool or tubular.
Dependencies are inferred from the claim text.