World's First Tandem 2.125' Coiled Tubing Tractor for ESP Open Hole Completions

摘要

Hydraulic coiled tubing (CT) tractors with a 4.7" outside diameter (OD) have been employed quite effectively, with superior CT accessibility, in the extended reach, open hole horizontal wells of a giant carbonate field in Saudi Arabia. The use of such tractors in these mega-reach wells has allowed more cost-effective chemical placements and well stimulation treatments. Relatively large monobore completions — with 7" OD tubing — of water injectors in this field have been necessary for the success of the CT tractor deployment. Conducting similar well interventions with hydraulic CT tractors in oil producers posed a challenge, mainly because of the smaller completion sizes and the chance of restrictions in the completion. Although a smaller 2.125" OD tractor existed, the pulling force of this tractor was insufficient to reliably pull the CT to total depth (TD) in many of these extended reach oil wells. Subsequently, the wells have not been stimulated to TD, which results in reduced production and reservoir optimization.