For the first time in ADCO, and the UAE, a window was opened in Super 13CR 7 inch casing in well QW-XY. Extensive pre-job planning, two way communication between ADCO and Baker Hughes, and flawless job execution were the key factors for the success which allowed ADCO to immediately reach the reservoir, saving significant time and costs versus the typical window in the 9 5/8 inch casing.
The main objective was to avoid cutting the window through the 9 5/8 inch casing to leave space for the ESP completion to be installed deeper for enhanced oil recovery and extending the well life. This also saved resources to drill 8-12/" section including OBM and 7 inch liner and its related accessories that were going to be required in case of the 9 5/8 inch casing window. The team decided to take the challenge presented in the stiffness of the Super 13CR material and the deviation at the window depth to save Rig days and resources.
This operation utilized Path-Master whip stock and Silverback milling technology to successfully open the window and drill the required rat-hole in one trip. Another reaming trip was carried out to ensure seamless reentry with the drilling BHA later on. Teamwork and cooperation are the keywords that made this operation possible; with Baker Hughes technology and ADCO's innovation.
This paper describes the first ever window opeing thorugh 7in S13CR in the UAE. This includes planning, risk assessment, the challeges, procedures and the conclusion. A detailed cost-benefit analysis is presented between 9-5/8" convetional window opeing compared with 7in window.