Abstract

The horizontal well count increase during the past decade and associated surge in coiled tubing intervention services has prompted high-paced research into optimization of coiled tubing (CT) milling efficiency. One of the products produced by this research was a new, state-of-the-art, dynamic CT modeling software module that was aimed at increasing CT plug-milling efficiency in extended-reach wells. This dynamic CT modeling software was introduced last year (Yeung, J. et al. 2015) with the expectation that it would deliver numerous benefits to its users. This paper will focus on the subsequent implementation, lessons-learned and benefits associated with use of this new software module.

Specifically, this paper will analyze case histories of plug-milling operations that utilized the new dynamic software modeling module versus similar operations performed on offset "control wells" where historical plug-milling techniques were applied. Weight on bit (WOB) measurements recorded by a downhole load cell tool are compared to the WOB values predicted by the dynamic modeling software, so that the predicted WOB values from the software can be analyzed.

Following review of the field data from multiple wells, the dynamic modeling software module has proven to significantly enhance the efficiency of CT plug-milling operations. This improvement was a direct result of the CT operator acting on key decision-making data that was provided by the software. In addition, the WOB prediction accuracy of the modeling software was validated against WOB measurements from a downhole tool. During this project it was also observed that proper training and presentation of documented results from use of this new software tool will serve to enhance the adoption rate in the field. Finally, this paper documents the estimated financial benefits that the software can deliver to the bottomline.

While introduction of dynamic CT modeling software provided the potential to enhance CT plug-milling efficiency, there was much speculation as to how well it would actually perform in the field and the actual amount of benefits that could be achieved. There was also a concern regarding the amount of time required for field users to become proficient with use of the software module and how quickly field personnel would adopt it. This paper addresses all of these issues.

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