# 📐  L2 Spec — Well Productivity Index Inversion — Nominal + Mismatch Specs

**ID:** `L2-465-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-465`](/artifact/l1/L1-465)

> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.25 · **Delta tier:** 5
> **⛓ On-chain block:** 41555283

---

## 1. Domain Ω

**Type:** `range`

| Parameter | Unit | Range |
|---|---|---|
| K md | — | 0.1 – 10000 |
| Skin factor | — | -5 – 50 |
| N pressure points | — | 50 – 5000 |
| Wellbore storage c bbl psi | — | 0.001 – 1.0 |

## 2. Tolerance (ε)

**Type:** `fn`

```
10 + 5 * (wellbore_storage_C_bbl_psi / 0.01) ** 0.2
```

## 3. Difficulty

| Property | Value |
|---|---|
| Difficulty score | 0.25 |
| Delta tier | 5 |

## 4. Fingerprint

`f9050387f0ef02f32e9b9e0ac455b7f7d03e7dc359e221ce30ae5fd3733002c1`

## 5. On-chain Registration

- **Chain hash:** `0x5e113d2752393002041f8c25cacbd52f06b55ba9eace3d94fc1a4613b03d19c6`
- **Chain tx hash:** `0xc6b0940a64bd9ea9614b1baa6d2ea988aaee6335c9c3513687e98508e6542001`
- **Chain block:** `41555283`

---

## File Mapping

This bundle consists of: `L2-465-001.md`, `L2-465-001.json`.

| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-465-001.md` | Source of truth — edit this | Human or LLM |
| `L2-465-001.json` | Structured metadata for the registry | LLM regenerates from the sections above |

**Prompt for your LLM after editing this Markdown:**

> Read the attached Markdown. Regenerate the sibling `.json` so every field matches.
> Preserve the schema documented in the rows above.
> Output each file in its own fenced code block tagged with the filename.
> Output only the JSON object.

_This Markdown was auto-synthesized from the catalog row for `L2-465-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._