New High Temperature Coiled Tubing Drilling Bottom Hole AssemblyEnables Slimhole Re-Entry Drilling in Challenging High Temperature Wells

摘要

The following paper presents a new high temperature Coiled Tubing Drilling(CTD)Bottom Hole Assembly(BHA)with its technical improvements and adjustments needed,to operate beyond previous temperaturelimitations and in more challenging formations.It summarizes the field-test results and first achievementsof the BHA in the increasing High Temperature(HT)re-entry drilling environment.The introduced HT CTD BHA incorporates a new generation of electronics and adjusted technicalsolution to operate in this challenging environment.The developed designs address the increasedtemperature impact to the downhole electronics,the various integrated sensors and mechanical componentslike the oil hydraulic system of the BHA.Details on these technical improvements are provided incombination with an overview on the changing CTD market segment to higher temperature application.The results and performance of the new CTD BHA within the first deployments in the Middle East arepresented,and details of the associated application are provided.