Patent ID: 11867003
Assignee: CONOCOPHILLIPS COMPANY
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 0:
1. A system for extending reach in a well having a well wall, the system comprising:
a first coiled tubing string having a first coil interior surface, the first coiled tubing string having a first length;
a second coiled tubing string disposed within the first coiled tubing string and having a second coil exterior surface, the second coiled tubing string having a second length, the first length being different than the second length; and
an annulus defined by the first coil interior surface and the second coil exterior surface, the annulus sealed proximal to a top end of the first coiled tubing string via a first seal and sealed proximal to a bottom end of the first coiled tubing string via a second seal, a fluid being sealed within the annulus by the first and second seals at a pressure prior to deployment in the well.