Research on Pipe-in-Pipe Coiled Tubing

Abstract

Under balanced technology is now urgently needed to handle weak and leakage conditions. This paper describes a new Pipe-in-Pipe Coiled Tubing which can form its own circulation passage. Due to its unique property, Pipe-in-Pipe Coiled Tubing is especially suitable for low-washed sand, plugging, drilling and grinding, drilling and other operations. Current applications of Pipe-in-Pipe Coiled Tubing is overviewed in this paper; an indoor bench is also built to experimentally study the axial force transfer behavior of Pipe-in-Pipe Coiled Tubing, results shows: due to the difference on Moment of inertia, Pipe-in-Pipe Coiled Tubing's axial force transfer efficiency would be higher than that of Traditional Coiled tubing under the same condition. This paper would be useful for the practical application of Pipe-in-Pipe Coiled Tubing.