System and method for anchoring and stroking a downhole motor milling assembly in a floating rig environment
AssigneeHalliburton Energy Services, Inc.
InventorsAdam Michael Pasicznyk, Esiquiel Marquez
Life of this patent
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Abstract
Provided herein are various embodiments of a downhole motor milling assembly having a tubular string, a flow-by anchor positioned on the tubular string, a stroking device positioned on the tubular string and downhole from the flow-by anchor, a downhole motor positioned on the tubular string and downhole from the stroking device, and a milling assembly positioned on an end of the tubular string. Further milling assemblies provide where the flow-by anchor temporarily attaches to a casing while permitting mud to flow past the flow-by anchor.
Claims20
A downhole motor milling assembly comprising:
- a tubular string surrounded by a casing with an annular area in between the tubular string and the casing;
- a flow-by anchor positioned on the tubular string to allow mud to simultaneously flow downhole through the tubular string and up-hole through the annular area;
- a stroking device positioned on the tubular string and downhole from the flow-by anchor;
- a downhole motor positioned on the tubular string and downhole from the stroking device;
- and
- a milling assembly positioned on an end of the tubular string;
- wherein the stroking device is configured to create a downward pressure on the milling assembly to mill a secondary wellbore while cuttings flow up-hole through the annular area.
A downhole motor milling assembly comprising:
- a tubular string surrounded by a casing with an annular area in between the tubular string and the casing;
- a flow-by anchor positioned on the tubular string to allow a flow of mud downhole through the tubular string;
- slips which extend outwardly from the flow-by anchor to temporarily attach to the casing;
- a stroking device positioned on the tubular string and downhole from the flow-by anchor;
- a downhole motor positioned on the tubular string and downhole from the stroking device and driven by the flow of mud downhole through the tubular string;
- and
- a milling assembly positioned on an end of the tubular string such that cuttings can flow up-hole through the annular area and past the flow-by anchor.
A method for milling a casing exit window and secondary wellbore comprising the steps of:
- positioning an orientation anchor within a primary wellbore;
- lowering a tubular string having a flow-by anchor into the primary wellbore;
- removably attaching the flow-by anchor to a casing so that it has a temporarily fixed position relative to the casing;
- allowing mud to travel downhole through the tubular string and past the flow-by anchor to cause a downhole motor to rotate;
- and
- milling out a casing exit window using a milling assembly driven by the downhole motor while the flow-by anchor remains in its temporarily fixed position relative to the casing and simultaneously allows cuttings to travel up-hole through an annular area between the tubular string and the casing.
Dependencies are inferred from the claim text.