neqsim-eos-regression SKILL.md skillA

neqsim-eos-regression from equinor/neqsim is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned
mdr add equinor/neqsim/neqsim-eos-regression@git:20261104.e22f4be

Pins git:20261104.e22f4be in mdr.lock. Pin the fingerprint instead.

Audit grade
A, 17 of 17 checks passed
Kind
SKILL.md skill
Repository
equinor/neqsim
Path
.github/skills/neqsim-eos-regression/SKILL.md
Versions recorded
10
Latest version
git:20261104.e22f4be, committed Nov 4, 2026
First version recorded
Apr 5, 2026
Size
16,472 bytes
Repository stars
167
License
Apache-2.0

EOS parameter regression workflow for fitting equation-of-state models to experimental data. USE WHEN: tuning binary interaction parameters (kij), matching saturation pressures, fitting PVT data (CME, CVD, DL), characterizing C7+ fractions, or validating EOS predictions against lab measurements. Covers SRK, PR, CPA parameter fitting strategies.

Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.

What the file says

# EOS Parameter Regression Workflow

Guide for fitting equation-of-state parameters to experimental data using NeqSim.

## When to Use This Skill

- Fitting binary interaction parameters (kij) to VLE/LLE data
- Matching saturation pressure (bubble/dew point) to lab measurements
- Tuning C7+ characterization to PVT experiments (CME, CVD, DL)
- Validating EOS predictions against NIST or experimental data
- Selecting the best EOS for a specific fluid system

## Regression Strategy

For reservoir material-balance handoff, use `CalibratedPvtModel` to freeze original
and independently tuned fluids with sample/model/laboratory revision references.
Compare complete held-out CCE/CVD/DLE and separator experiments before accepting
the tuned model. Never split rows from one depletion experiment between tuning and
validation. `MaterialBalancePvtHistory` requires an explicitly attributed depletion
and separator path; constant-composition flash tables cannot be passed as CVD/DLE
history. It checks alignment and provenance fields, not the external evidence's
truth or experimental accuracy. See `docs/pvtsimulation/reservoir_material_balance.md`
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint
mdr add equinor/neqsim/neqsim-eos-regression@sha256:b6b7c3ae7109bc96

The line at the top of this page pins the label git:20261104.e22f4be, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.

Badge

mdr badge

[![mdr](https://markdownregistry.com/badge/art_6y7mkd3roxpswexh.svg)](https://markdownregistry.com/a/art_6y7mkd3roxpswexh)

3 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 10 versions of this file, between Apr 5, 2026 and Nov 4, 2026, about one every 24 days.

versioncommittedcommitsizeaudit
git:20261104.e22f4be latest2026-11-04 e22f4be 16,472 BA view · diff
git:20261104.f8e5b7b2026-11-04 f8e5b7b 15,403 BA view · diff
git:20261103.6d4c8052026-11-03 6d4c805 14,369 BA view · diff
git:20261103.6c533952026-11-03 6c53395 13,940 BA view · diff
git:20261031.dec45282026-10-31 dec4528 13,244 BA view · diff
git:20261012.7dc323b2026-10-12 7dc323b 11,718 BA view · diff
git:20261007.e24ee802026-10-07 e24ee80 10,252 BA view · diff
git:20260815.36b64de2026-08-15 36b64de 9,807 BA view · diff
git:20260418.a3c26d62026-04-18 a3c26d6 6,795 BA view · diff
git:20260405.76750102026-04-05 7675010 6,767 BA view

Audit of the latest version

A  17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.
  • pass: Frontmatter block present
  • pass: Frontmatter declares a name
  • pass: Frontmatter declares a description
  • pass: Size between 200 bytes and 200 KB (16472 bytes)
  • pass: No zero-width or bidi control characters
  • pass: No instruction hidden inside an HTML comment
  • pass: No link to an exfiltration or paste host
  • pass: No credential-shaped string
  • pass: No instruction to send local credentials anywhere
  • pass: No text hidden with inline styles
  • pass: No prompt-injection phrasing
  • pass: No curl or wget piped into a shell
  • pass: No recursive delete of root, home or parent
  • pass: No instruction to read or print local credentials
  • pass: No base64 blob over 200 characters
  • pass: No link to a raw IP address
  • pass: No script tag

Source

GitHub

equinor/neqsim · 167 stars · license Apache-2.0 · pushed 2026-11-08 · branch master

API

GET https://markdownregistry.com/api/v1/artifacts/art_6y7mkd3roxpswexh
GET https://markdownregistry.com/api/v1/resolve?ref=equinor/neqsim/neqsim-eos-regression
GET https://markdownregistry.com/api/v1/blob/b6b7c3ae7109bc9603f790832437d8af36c0de338ca56d28f4bc1e2c97a532fc

Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.

Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.

More from equinor/neqsim

.cursorrules Cursor rule
equinor/neqsim · .cursorrules
git:20260418.119a3f4 · audit A · 167 stars
analyze-convergence SKILL.md skill
equinor/neqsim · .github/skills/analyze-convergence/SKILL.md · Interpret flash algorithm convergence metrics, identify patterns, and produce
git:20260919.77c34a0 · audit A · 167 stars
analyze-gibbs-convergence SKILL.md skill
equinor/neqsim · .github/skills/analyze-gibbs-convergence/SKILL.md · Interpret Gibbs energy minimization convergence metrics, analyze Jacobian
git:20260919.77c34a0 · audit A · 167 stars
book-creation SKILL.md skill
equinor/neqsim · .github/skills/book-creation/SKILL.md · PaperLab skill for book creation workflows in scientific writing and book production.
git:20260919.77c34a0 · audit B · 167 stars
design-flash-benchmark SKILL.md skill
equinor/neqsim · .github/skills/design-flash-benchmark/SKILL.md · Create a structured test matrix for comparing flash algorithm performance
git:20260919.77c34a0 · audit A · 167 stars
design-reactor-benchmark SKILL.md skill
equinor/neqsim · .github/skills/design-reactor-benchmark/SKILL.md · Create a structured test matrix for evaluating Gibbs energy minimization
git:20260919.77c34a0 · audit A · 167 stars
figure-discussion SKILL.md skill
equinor/neqsim · .github/skills/figure-discussion/SKILL.md · PaperLab skill for figure discussion workflows in scientific writing and book production.
git:20260919.77c34a0 · audit A · 167 stars
generate-publication-figures SKILL.md skill
equinor/neqsim · .github/skills/generate-publication-figures/SKILL.md · Create matplotlib figures that meet journal submission standards: correct fonts,
git:20260919.77c34a0 · audit A · 167 stars
journal-formatting SKILL.md skill
equinor/neqsim · .github/skills/journal-formatting/SKILL.md · Apply journal-specific formatting rules to transform a manuscript from Markdown
git:20260919.77c34a0 · audit A · 167 stars
neqsim-acid-gas-treating SKILL.md skill
equinor/neqsim · .github/skills/neqsim-acid-gas-treating/SKILL.md · Guides NeqSim agents through acid-gas and contaminant removal with SimpleAmineAbsorber, SimpleAmineRegenerator…
git:20261004.fc23e28 · audit A · 167 stars
neqsim-advanced-control-mpc-and-virtual-sensing SKILL.md skill
equinor/neqsim · .github/skills/neqsim-advanced-control-mpc-and-virtual-sensing/SKILL.md · Guides agents through ProcessLinkedMPC, ProcessLinearizer, ModelPredictiveController, VirtualFlowMeter, SoftSensor, and…
git:20261004.fc23e28 · audit A · 167 stars
neqsim-agent-handoff SKILL.md skill
equinor/neqsim · .github/skills/neqsim-agent-handoff/SKILL.md · Agent-to-agent communication schema for NeqSim. USE WHEN: composing multi-agent pipelines where one agent's output…
git:20260926.08d0028 · audit A · 167 stars

Every file in equinor/neqsim

Browse by kind, by grade A, or by owner.