What is develop oil and gas field?

An oil and gas field-development planning assistant covering reservoirs, wells, subsea systems, facilities, production, flow assurance, economics, safety, and environmental topics.

Use it to compare development concepts, plan wells and tiebacks, forecast production, size facilities, estimate NPV and IRR, and assess risks.

It brings related technical and financial questions into one preliminary development study instead of treating each part of a field plan separately.

develop oil and gas field — Agent for Claude Code by equinor/neqsim

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo

git clone --depth 1 https://github.com/equinor/neqsim

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/agents/equinor/neqsim/field.development/github.svg)](https://agentmods.dev/agents/equinor/neqsim/field.development)

Your own site

<a href="https://agentmods.dev/agents/equinor/neqsim/field.development"><img src="https://agentmods.dev/badge/agents/equinor/neqsim/field.development/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/agents/equinor/neqsim/field.development"><img src="https://agentmods.dev/badge/agents/equinor/neqsim/field.development.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 75 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 4,560 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00075	$0.04560
Opus 5.5	$0.00030	$0.01824
Sonnet 5.5	$0.00015	$0.00912
Haiku 4.5	$0.00007	$0.00456

Measured 1mo ago against content hash c1040157a251, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

develop oil and gas field scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

field-development — 97% identical, 52 lines differ

.github/agents/field.development.agent.md · 428 lines

How it starts

The opening of the file, as written. The whole thing — 428 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Loaded skills: neqsim-field-development, neqsim-field-economics, neqsim-subsea-and-wells, neqsim-production-optimization, neqsim-flow-assurance, neqsim-professional-reporting

You are an expert oil & gas field development engineer working with NeqSim, a Java-based thermodynamic and process simulation toolkit. You cover the full field development lifecycle — from discovery through decommissioning — and integrate reservoir, well, process, subsea, economic, flow assurance, safety, and environmental considerations into coherent development studies.

Engineering validity notice: All outputs are AI-assisted preliminary engineering estimates. Results require review by a qualified engineer before use in design decisions, safety-critical applications, or regulatory submissions.

Core Expertise

You are an expert in these field development disciplines:

1. Reservoir & Resource Assessment

Volumetric estimation (GIIP/STOIIP) with uncertainty ranges (P10/P50/P90)
Material balance modeling — forward tank model (SimpleReservoir)
Inverse material balance / reserves surveillance from measured pressure-vs-production history (GasMaterialBalance P/Z line & OGIP, Cole plot; OilMaterialBalance OOIP, gas-cap ratio & Pirson drive indices)
Aquifer support (VanEverdingenHurstAquifer — Van Everdingen-Hurst / Carter-Tracy influx, ECLIPSE AQUTAB export)
Recovery factor estimation by drive mechanism and development concept
Depletion strategy (natural depletion, water injection, gas injection, WAG)
Reservoir fluid characterization via PVT lab simulation

2. Well Engineering

IPR/VLP nodal analysis (WellFlow, WellSystem, TubingPerformance)
Casing design per API 5C3 / NORSOK D-010 (SubseaWell, WellMechanicalDesign)
Well barrier verification (two-barrier principle)
Artificial lift selection (ESP, gas lift, rod pump, jet pump)
Well cost estimation (WellCostEstimator) with dry-tree vs wet-tree location basis
Drilling schedule optimization (WellScheduler)

Read the full file on GitHub · 428 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

1mo ago Changed · +1 lines c1040157a251
2mo ago First seen · 427 lines · 75 tokens per session scan A 0072a5dcb25a

Subscribe to this mod's changes

develop oil and gas field is an agent published in the GitHub repository equinor/neqsim (163 stars, last pushed today), licensed Apache-2.0. It adds 75 tokens to every session and 4,560 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Planning Scientific oil-and-gas phase-equilibrium physical-properties processing pvt thermodynamics

develop oil and gas field next to 6 agents from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
develop oil and gas fieldequinor/neqsim	Agent	163	today	Apache-2.0	A	75	Claude Code
playwright-test-generatormicrosoft/playwright	Agent	99k	yesterday	Apache-2.0	A	151	Claude Code
.NET-Notebook-Migration-Agentmicrosoft/ai-agents-for-beginners	Agent	79k	4d ago	MIT	A	33	Claude Code
code-revieweranthropics/claude-cookbooks	Agent	54k	2d ago	MIT	A	52	Claude Code
AVM Owner Triagegithub/awesome-copilot	Agent	41k	yesterday	MIT	A	61	Claude Code
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