Variable radius annular and ram packing unit and method
AssigneeHydril USA Manufacturing LLC
InventorDavid Alexander Trevas
Life of this patent
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Abstract
A packing unit to seal a wellbore, the packing unit including at least one rotatable cam having a cam axis disposed about an axis of the wellbore, wherein the at least one rotatable cam is rotatable about the cam axis, the at least one rotatable cam comprising a seal recess formed in an outer periphery of the at least one rotatable cam, wherein the packing unit sealingly engages a tool in the wellbore by rotation of the at least one rotatable cam, bringing the seal recess into sealing contact with the tool.
Claims20
A packing unit to seal a wellbore, the packing unit comprising:
- at least one rotatable cam disposed about an axis of the wellbore, the at least one rotatable cam having a cam axis and being rotatable about the cam axis;
- the at least one rotatable cam comprising a seal recess formed in an outer periphery of the at least one rotatable cam;
- wherein the packing unit sealingly engages a tool in the wellbore by rotation of the at least one rotatable cam, bringing the seal recess into sealing contact with the tool.
A blowout preventer, comprising:
- a main body having a wellbore axis defined therethough;
- a packing unit disposed within the main body and configured to seal the wellbore, wherein the packing unit comprises:
- at least one rotatable cam having a cam axis, wherein the at least one rotatable cam is rotatable between at least a first rotary position and a second rotary position;
- the at least one rotatable cam comprising a seal recess formed in an outer periphery of the at least one rotatable cam;
- the seal recess configured to seal against a minimum radius when the at least one rotatable cam is in the first rotary position;
- the seal recess configured to seal against a maximum radius when the at least one rotatable cam is in the second rotary position;
- and
- the seal recess comprising a taper between the first and the second rotary positions, the taper configured to seal against a range of radii between the minimum radius and the maximum radius as the at least one rotatable cam is rotated about the cam axis between the first and second rotary positions.
A packing unit to seal a wellbore, the packing unit comprising:
- at least one arc segment disposed about an axis of the wellbore, wherein the at least one arc segment is disposed within an arc guide;
- the at least one arc segment comprising a seal recess formed in an outer periphery of the at least one arc segment;
- wherein the packing unit sealingly engages a tool in the wellbore by moving the at least one arc segment within the arc guide, bringing the seal recess into sealing contact with the tool.
A method to seal a wellbore, the method comprising:
- disposing at least one rotatable cam about an axis of the wellbore, wherein the at least one rotatable cam is rotatable about a cam axis between at least a first rotary position and a second rotary position;
- engaging a tubular member with a seal recess formed in an outer periphery of the at least one rotatable cam, wherein the at least one engaged cam comprises a seal radius corresponding to an outer diameter of the tubular member when the at least one rotatable cam is at a rotary position between the at least first and the second rotary positions;
- forming a seal against the tubular with the seal recess of the at least one rotatable cam.
Dependencies are inferred from the claim text.