Overshot Tool and Method
AssigneeTIW Corporation
InventorBritt O. Braddick
Life of this patent
Estimating the term…
Abstract
An overshot tool is provided for interconnecting and sealing between a lower tubular (C) in a well and an upper tubular (30). A tubular expander sleeve (36) and an overshot sleeve (26) are supported in a well on an upper tubular. The tool housing (60) encloses a plurality of axially stacked pistons (58, 68, 74), which generate an axial force to move the expander sleeve downward and radially expand a portion of a lower tubular to seal between an outer diameter of the lower tubular and an inner diameter of the overshot sleeve.
Claims20
An overshot tool for interconnecting and sealing between a lower tubular in a well and an upper tubular in the well, the overshot tool comprising:
- a tubular expander sleeve supported in the well on the upper tubular;
- an overshot sleeve supported in the well on the upper tubular, the overshot sleeve having an internal diameter greater than the outer diameter of the lower tubular for circumferentially surrounding a portion of the lower tubular;
- a tool housing positioned in the well on a workstring and enclosing a plurality of axially movable stacked pistons for generating a cumulative axial force, each of the plurality of pistons axially movable in response to pressurized fluid transmitted downhole to the pistons on the workstring;
- an anchor supported on the work string for engaging an inner surface of the lower tubular and axially fixing the tool in the well, the anchor movable from a run-in position to a set position;
- and
- the tool housing axially movable relative to a tool mandrel in response to the plurality of pistons, the tool housing movable to push the expander sleeve axially downward to radially expand a portion of the lower tubular, such that the overshot sleeve is connected to and sealed with the expanded lower tubular.
An overshot tool for interconnecting and sealing between a lower tubular in a well and an upper tubular in the well, the overshot tool comprising:
- a tubular expander sleeve supported in the well on the upper tubular;
- an overshot sleeve supported in the well on the upper tubular, the overshot sleeve having an internal diameter greater than the outer diameter of the lower tubular for circumferentially surrounding a portion of the lower tubular;
- a tool housing positioned in the well on a workstring;
- a plurality of circumferentially spaced slips positioned on the radially inward surface of the overshot sleeve for gripping engagement with the expanded lower tubular;
- an anchor supported on the work string for engaging an inner surface of the lower tubular and axially fixing the tool in the well, the anchor movable from a run-in to a set position;
- a tool mandrel, the tool housing being axially movable relative to the tool mandrel when the anchor is set;
- and
- a plurality of pistons each connected to the mandrel for moving the anchor to the set position;
- and
- the tool housing axially movable relative to a tool mandrel in response to the plurality of pistons, the tool housing movable to push the expander sleeve axially downward to radially expand a portion of the lower tubular, such that the overshot sleeve is connected to and sealed with the expanded lower tubular.
A method of interconnecting and sealing between a lower tubular in a well and an upper tubular in the well, the method comprising:
- supporting a tubular expander sleeve in the well on the upper tubular;
- supporting an overshot sleeve in the well on the upper tubular, the overshot sleeve having an internal diameter greater than the outer diameter of the lower tubular for circumferentially surrounding a portion of the lower tubular;
- positioning a tool housing in the well on a workstring and enclosing a plurality of axially movable stacked pistons for generating a cumulative axial force, each of the plurality of pistons axially movable in response to pressurized fluid transmitted downhole to the plurality of pistons on the workstring;
- engaging an anchor with an inner surface of the lower tubular and axially fixing the position of the tool housing in the well, the anchor movable from a run-in to a set position in response to axial movement of the plurality of pistons;
- axially moving a tool housing relative to the tool mandrel to set the anchor;
- and
- energizing the plurality of pistons to push the expander sleeve axially 20 downward to radially expand a portion of the lower tubular, such that the overshot sleeve is connected to the expanded lower tubular.
Dependencies are inferred from the claim text.