Oil Well Completions Concepts and Calculations Part 1

The way the abstractions get unpacked made it easier to map equations to what shows up in oilgas field data, and it’s easier to reason about than I expected. The worked example in Section 2.4 backing RPS out from perforation diameter and skin stuck with me, especially the psi/ft conversion step that people usually hand-wave. I’ve already mirrored that calc in a scratch repo and sanity-checked it against a small PR at work; it fits our completions arch, and I don’t feel lost jumping between notes and prod. wished there was more on nodal edge cases during frac hits, but it’s sharpened my sense of where abstractions tend to leak.

Found this while auditing obs gaps tied to our oilgas work, and the first gripe: module 3’s pacing felt uneven, with the spreadsheet setup assumed and not shown. Past that, it clicked fast. The section on perforation friction calculations stuck, especially the worked example where RPS is varied and you see skin swing in the table. That translated cleanly when I sanity-checked numbers in our repo for a completions study. I liked how the arch tradeoffs between tubing ID and frac stages were framed without fluff. It doesn’t try to be infra-heavy, but the math maps to prod decisions I see in PRs. I’ve already reused the casing burst check logic during review time, so this felt like a good use of PD hours.

The framing around testability went deeper than expected, especially when it tied completion choices back to how you actually verify behavior later. The section on pressure test envelopes, where the instructor walks through a tubing/casing pressure calc and then sanity-checks it against field limits, stuck with me; it felt like reading an arch decision memo rather than a slide deck. As someone bouncing between legacy oilgas work and modern infra, I kept mapping it to prod guardrails, CI checks, and the stuff that keeps RPS spikes from surprising you. There's a practical throughline about keeping assumptions consistent across steps, not just getting the math right—helpful if you’ve ever debugged a mismatch between a spreadsheet and what obs says. I wasn't sold on the pace of the cementing overview; wished there was a bit more on failure modes before moving on. Still, the way it weighs consistency tradeoffs across completion options is the part I’ll probably reuse.