Modular downhole plug tool
AssigneeLevel 3 Systems, LLC
InventorMichael S. Allumbaugh
Life of this patent
Estimating the term…
Abstract
A pressure-isolation device has a plug for isolating pressure within a wellbore. The plug can include one or more modular mandrel assemblies partially disposed within each other. Each mandrel assembly can include a sealing element and a shear pin for setting the mandrel section. Each mandrel assembly can also have a collar element, a shear sleeve, a mandrel stop element, and a back-up ring in contact with the sealing element. The plug can further include a bottom receiving element including a knockout plug. The plug assembly can include a top catch element for setting and pulling the plug.
Claims18
A device, comprising:
- a main body having a top end and a bottom end, and the main body is substantially cylindrical;
- the main body comprises a first diameter adjacent the top end, a second diameter adjacent the bottom end, and the first diameter is larger than the second diameter;
- the main body further comprises a tapered section between its first diameter and its second diameter;
- at least one sealing element disposed about the main body;
- a receiving body that is substantially cylindrical;
- a shear pin disposed within the receiving body;
- and
- the main body is at least partially disposed within the receiving body, and a collar element is at least partially disposed within the receiving body;
- and
- the shear pin is further disposed within a shear sleeve, the shear sleeve at least partially disposed within the receiving body.
A device, comprising:
- a bottom receiving body comprising a knockout plug;
- a first mandrel assembly comprising:
- a first main body having a top end and a bottom end, and the first main body is at least partially disposed within the bottom receiving body;
- a first sealing element disposed about the first main body;
- a first shear pin disposed within the bottom receiving body;
- and
- the device further comprises:
- a second mandrel assembly comprising:
- a second main body having a top end and a bottom end, the second main body partially disposed within the first main body;
- a second sealing element disposed about the second main body;
- and
- a second shear pin disposed within the first main body.
A method, comprising:
- selecting a first shear pin and a second shear pin according to a desired order of engagement of a first mandrel and a second mandrel;
- assembling a plug assembly comprising the first mandrel, the second mandrel and a bottom receiving body, the first mandrel comprises the first shear pin and a first sealing element, the first mandrel is at least partially disposed within the second mandrel, the second mandrel comprises the second shear pin and a second sealing element, the second mandrel is at least partially disposed within the bottom receiving body;
- deploying the plug assembly into a wellbore;
- applying pressure until a weaker shear pin of the first and second shear pins shears;
- and then
- applying additional pressure until a remaining shear pin of the first and second shear pins shears.
Dependencies are inferred from the claim text.