August 22, 2021: it appears Continental Resources has "FI" units in all their plays. My hunch becomes more likely simply: "fill-in units." See this very, very good article from 2017.
August 22, 2021: the more I look at this, the more I think a reader's "guess" that this simply stands for Fill-In Unit" is exactly right.
Continental Resources has at least three major drilling projects with "FIU" in the name of the wells in these units.
- 38219, conf, CLR, Plano FIU, 4-28H, southwest side of Williston;
- 38140, conf, CLR, Dennis FIU, 12-8H, Dunn County, north of Killdeer;
- 37945, conf, CLR, Brangus FIU, 14-11H2, Elm Creek, McKenzie County;
As another example, the LCU in some CLR names refers to the "Long Creek Unit" wells, southeast of Williston.
The FIU similarly designates a drilling unit. I have spent a long time trying to figure it out, never could, gave up, figured that the "F" referred to "federal." And then moved on.
But now a reader asks. The reader asked the NDIC but they were unable to answer the question, saying one would have to ask Continental Resources.
Before I do that, and I probably won't in any event, I'll see if any readers know.
The first reader to correctly answer this question will get a lifetime subscription to the blog.
The FIU north of Killdeer is tracked here.