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US 11,454,085 B2Granted
Cased bore straddle packer
AssigneeExacta-Frac Energy Services, Inc.
InventorJoze John Hrupp
Life of this patent
Estimating the term…
Abstract
A cased bore straddle packer has an upper unload sub sleeve with fluid ports that are selectively aligned with corresponding ports in an upper unload sub mandrel component and a lower unload sub sleeve with fluid ports that are selectively aligned with corresponding ports in a lower unload sub mandrel component to permit fluid to be selectively dumped from the straddle packer. Control of the alignment of the respective ports is effected by manipulating an auto-J ratchet machined into a multicomponent mandrel of the straddle packer. The auto-J ratchet is controlled from the surface using completion string pull and push manipulations.
Claims20
A cased bore straddle packer comprising:
- a multicomponent mandrel that extends from an upper end to a lower end of the cased bore straddle packer, the multicomponent mandrel having a completion string connection mandrel component at the upper end of the straddle packer to permit the connection of a completion tubing string to the straddle packer, an upper packer element mandrel component with an upper packer element piston, and a lower packer element piston mandrel component with a lower packer element piston;
- an upper packer element adapted to surround the multicomponent mandrel uphole of a flow activation mandrel component and a lower packer element adapted to surround the multicomponent mandrel downhole the flow activation mandrel component;
- an upper packer element compression sleeve uphole of the upper packer element, the upper packer element compression sleeve adapted to reciprocate on the upper packer element mandrel component, and a lower packer element compression sleeve adapted to reciprocate on the lower packer element piston mandrel component downhole the lower packer element;
- an auto-J ratchet groove in the multicomponent mandrel downhole of the lower packer element, the auto-J rachet groove having a slip engage notch adapted to permit string weight on the completion tubing string to force the multicomponent mandrel downhole to urge the upper packer element to an initial set condition and the lower packer element to the initial set condition;
- an upper packer element piston port downhole of the upper packer element piston adapted to permit fluid pumped through the completion string to enter an upper packer element piston chamber and urge the upper packer element compression sleeve to boost compression of the upper packer element when high pressure fluid is pumped into the cased bore straddle packer;
- and
- a lower packer element piston port in the lower packer element piston component to permit the pumped fluid to enter a lower packer element piston chamber to urge the lower packer element compression sleeve to boost compression of the lower packer element.
4 more elements
A cased bore straddle packer, comprising:
- a multicomponent mandrel that extends from an uphole end to a downhole end of the cased bore straddle packer, the multicomponent mandrel having a completion string connection mandrel component at an uphole end of the cased bore straddle packer to permit the connection of a completion tubing string to the cased bore straddle packer;
- an upper packer element uphole of a flow activation mandrel component of the multicomponent mandrel and a lower packer element down hole of the flow activation mandrel component;
- an upper packer element compression sleeve adjacent an uphole end of the upper packer element, the upper packer element compression sleeve being adapted to reciprocate over an upper packer element compression piston on an upper packer element mandrel component of the multicomponent mandrel, and a lower packer element compression sleeve adjacent a downhole end of the lower packer element, the lower packer element compression sleeve being adapted to reciprocate over a lower packer element compression piston of a lower packer element compression piston mandrel component of the multicomponent mandrel;
- and
- an auto-j ratchet with an auto-J ratchet lug that engages an auto-J ratchet groove in the multicomponent mandrel, having neutral notch positions in which mechanical slips are in an unset condition and the upper and lower packer elements are respectively in relaxed conditions, interleaved with slip engage notch positions in which the mechanical slips are moved to a set condition and the upper and lower packer elements are compressed into contact with a casing of the cased well bore in an initial set condition when string weight is applied to the completion tubing string.
2 more elements
The cased bore straddle packer as claimed in claimed 12 further comprising a floating packer element compression sleeve that reciprocates on the multicomponent mandrel between a downhole end of the flow activation sleeve and an uphole end of the lower packer element.
A cased bore straddle packer, comprising:
- a multicomponent mandrel that extends from an uphole end to a downhole end of the cased bore straddle packer, the multicomponent mandrel having a completion string connection mandrel component at an uphole end of the cased bore straddle packer to permit the connection of a completion tubing string to the cased bore straddle packer;
- an auto-j ratchet with an auto-J ratchet lug that engages an auto-J ratchet groove in the multicomponent mandrel having neutral notch positions, in which mechanical slips are in an unset condition and upper and lower packer elements are in relaxed conditions, interleaved with slip engage notch, positions, in which the mechanical slips are urged to a set condition and the upper and lower packer elements are compressed into contact with a casing of the cased well bore in an initial set condition when string weight is applied to the completion tubing string;
- and
- an upper packer element compression sleeve adjacent an uphole end of an upper packer element, the upper packer element compression sleeve being adapted to reciprocate over an upper packer element compression piston on an upper packer element mandrel component of the multicomponent mandrel to boost compression of the upper packer element in response to fluid pressure pumped through the completion string, and a lower packer element compression sleeve adjacent a downhole end of a lower packer element, the lower packer element compression sleeve being adapted to reciprocate over a lower packer element compression piston of a lower packer element piston mandrel component of the multicomponent mandrel to boost compression of the lower packer element in response to the fluid pressure pumped through the completion string.
1 more element
Dependencies are inferred from the claim text.