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US 8,757,279 B2Granted
Pipe in pipe piston thrust system
AssigneeHalliburton Energy Services, Inc.
InventorRichard Thomas Hay
Life of this patent
Estimating the term…
Abstract
A pipe in pipe piston thrust system comprises a plurality of piston assemblies configured to sealingly engage a wellbore, a pump configured to transfer a fluid into the wellbore, and a by-pass disposed between a plurality of annuli formed by the plurality of piston assemblies. The by-pass allows for selective communication of the fluid between the plurality of annuli.
Claims20
A method for traversing a leak path comprising:
- closing a first by-pass through a first piston assembly, wherein the first piston assembly is disposed in a wellbore;
- opening a second by-pass through a second piston assembly to provide fluid communication to the first piston assembly, wherein the second piston assembly is disposed in the wellbore;
- axially displacing the first piston assembly and the second piston assembly in a first direction in a wellbore based on the fluid communication with the first piston assembly;
- closing the second by-pass through the second piston assembly;
- providing a pressure differential across the second piston assembly;
- and
- axially displacing the first piston assembly in the first direction past a lateral path based on the pressure differential across the second piston assembly.
4 more elements
A method for traversing a lateral break comprising:
- sealingly engaging a first piston assembly with a wellbore;
- increasing pressure across the first piston assembly;
- displacing the first piston assembly axially within the wellbore in a first direction;
- sealingly engaging a second piston assembly with the wellbore to create a first annulus between the first piston assembly and the second piston assembly;
- opening a by-pass across the second piston assembly to allow fluid communication to the first annulus;
- displacing the first piston assembly and the second piston assembly axially within the wellbore in the first direction while maintaining the first annulus;
- opening a by-pass across the first piston assembly when pressure decreases across the first piston assembly;
- and
- closing the by-pass across the second piston assembly to increase pressure across the second piston assembly.
6 more elements
Dependencies are inferred from the claim text.