Using an Engineering Analysis Process to Identify Pragmatic Applications for Solid Expandable Tubular Technology
The results of well over 300 installations of solid expandable tubulars have established this technology as a feasible and practical option in a wide range of applications. The issues now at hand are two-fold; how best to use the technology and where the applications bring the most value. Studying drilling operation histories helps determine how to identify and optimize the application of this technology. An exhaustive analysis was performed using over 160 wells drilled offshore in the Gulf of Mexico (GoM) over a five year period. This dataset was populated specifically with 164 wells representing $2.84bn of drilling capital expenditure and 29.3 rig years drilled on floaters, jackups and tension leg platforms (TLPs). As part of the analysis, relevant nonproductive time (NPT) was extracted and analyzed, and totaled over 6,900 hours. A simple analysis was also conducted to identify an optimum time to make the decision to run expandable casing. The study data shows that the optimum time to make that decision for openhole drilling liners in unexpected NPT situations is approximately two days. In addition, various sensitivities were run on this dataset to provide guidance for drilling engineers. This paper documents how GoM well data is being used to establish a probabilistic approach to addressing common drilling challenges in a variety of environments and locales. It also specifically identifies how solid expandable tubular technology can be used to address and mitigate these challenges efficiently and reliably.