Remote-Activation Safety Valves and Coiled Tubing, Jointed-Tubing Hybrid String: A Novel Well-Intervention Technology

As oil reserves mature around the world, oil companies are focusing more attention to methods of improving the recovery of<br>existing assets and tapping into unconventional reserves, such as gas shale, tight gas, etc. There has been a natural<br>progression to larger sizes and premium material grades of coiled tubing (CT) and jointed tubing (JT) to adapt to these new<br>and extended applications. However, situationsexist,such as in long horizontal or ultradeep wells, where either the CT or JT<br>is unable to provide the required reach efficiently and safely. The JT is stronger but is limited to the stroke of the hydraulic<br>jack, whereas CT has twisting and buckling issues on extended-reach wells. This paper presents details on a novel concept of<br>combining CT and JT into a hybrid string to attain the speed and efficiency of CT and rigidity of JT.