Well Features Impact CT Reach Limits

摘要

The continued growth of extended-reach wells and the expanded use of coiled tubing during completion operations in these wells has placed increased reach requirements on CT units performing fracturing plug mill-outs, creating demand for increased-ca-pability CT spreads. CT reach typically is limited by friction lockup during milling operations and can reduce effective pay zone penetration. Several common well features typically contribute to the majority of the low force transfer factors, leading to insufficient set-down force and helical lockup. The industry has responded by creating larger CT rigs utilizing significantly larger-diameter tubing that can reach farther into laterals as a result of reduced radial clearances and higher flow rates for more efficient hole cleaning.