Patent ID: 9670748
Date: 2017-06-06
CPC Classifications: E21B

Claim:
1. A pipe in pipe piston thrust system comprising: a plurality of piston assemblies configured to sealingly engage a wellbore; a pump configured to transfer a fluid into the wellbore; a by-pass disposed between a plurality of annuli formed by the plurality of piston assemblies, wherein the by-pass allows for selective communication of the fluid between the plurality of annuli and for selective creation of a differential pressure between the plurality of annuli; a plurality of sensors that measure the differential pressure across each piston assembly of the plurality of piston assemblies; a tubular string; and a coupling mechanism configured to selectively grippingly engage the plurality of piston assemblies to the tubular string and to decouple the plurality of piston assemblies from the tubular string to permit the plurality of piston assemblies to reciprocate axially along the tubular string within the wellbore.