US 11,867,003 B2
Sealed concentric coiled tubing
Dustin K. Ward, Houston, TX (US); and Jing H. Chow, Houston, TX (US)
Assigned to ConocoPhillips Company, Houston, TX (US)
Filed by ConocoPhillips Company, Houston, TX (US)
Filed on Jul. 8, 2021, as Appl. No. 17/370,714.
Claims priority of provisional application 63/049,376, filed on Jul. 8, 2020.
Prior Publication US 2022/0010632 A1, Jan. 13, 2022
Int. Cl. E21B 17/20 (2006.01)
CPC E21B 17/20 (2013.01) [E21B 17/203 (2013.01)] 20 Claims
OG exemplary drawing
 
14. A method for extending reach in a well having a well wall, the method comprising:
receiving a second coiled tubing string concentrically within a first coiled tubing string;
receiving a fluid within an annulus, the annulus defined by a first coil interior surface of the first coiled tubing string and a second coil exterior surface of the second coiled tubing string, wherein the first coiled tubing string has a first length, and the second coiled tubing string has a second length, the first length being different than the second length;
receiving a first seal proximal to a top end of the first coiled tubing string; and
receiving a second seal proximal to a bottom end of the first coiled tubing string, the first seal and the second seal sealing the fluid within the annulus at a pressure prior to deployment in the well.