COILED TUBING IN EXTENDED REACH WELLBORES

摘要

A larger diameter coiled tubing is run into an extended reach deviated wellbore to a location at or near its horizontal reach limit. The smaller diameter coiled tubing is then run through the larger diameter tubing until the end of the smaller tubing protrudes from the larger tubing. The smaller tubing is then run further into the wellbore to a location further than would have been possible if either tubing had been run alone. Supplementary reach-increasing techniques such as friction reducing vibrators and/or downhole tractors can also be used in combination with the described techniques.

主权项

1. A method of deploying coiled tubing into an extended reach wellbore comprising:
positioning a first coiled tubing having an inner diameter into the wellbore such that a bottom end of the first coiled tubing resides in a deviated portion of the wellbore; translating a second coiled tubing having an outer diameter less than the inner diameter of the first coiled tubing through the first coiled tubing such that a bottom end of the second coiled tubing extends past the bottom end of the first coiled tubing; and continuing to translate the second coiled tubing through the first coiled tubing and into the deviated portion of the wellbore.