APIs › Petroleum Engineering Calculators › Mud Weight & EMW

Mud Weight & EMW

Equivalent mud weight and equivalent circulating density from pressure and depth, with kick-tolerance context.

POST /v1/petroleum/mud-weight-emw $0.01 per call

Specification

Endpoint

POST /v1/petroleum/mud-weight-emw

Price

$0.01 per call · tier standard_data

Payment

x402 on X Layer (chain 196) · settled in USDG or USDT0 · scheme exact

Data source

Published petroleum-engineering correlations, cited per endpoint

Timeout

15 seconds

Max request

64 KB

Version

1.0.0

Calling it

The first call returns a 402 with the payment challenge. Retry with a signed authorisation in the X-PAYMENT header — see the payment guide for the exact shape.

curl -i -X POST "https://api.dana-edu.pp.ua/v1/petroleum/mud-weight-emw" \
  -H "content-type: application/json" \
  -d '{ ... }'

Response

Real output, captured by running this endpoint at build time — not written by hand. Volatile fields such as timestamps are elided. Captured 2026-07-30.

{
  "equivalent_mud_weight_ppg": 10.5,
  "equivalent_mud_weight_kg_m3": 1258.2,
  "equivalent_mud_weight_sg": 1.2582,
  "pressure_gradient_psi_ft": 0.546,
  "equivalent_circulating_density_ppg": 10.361,
  "annular_pressure_loss_psi": 150,
  "overbalance_psi": -208,
  "balance_state": "underbalanced",
  "formula": "EMW(ppg) = P(psi) / (0.052 × TVD(ft))",
  "ecd_formula": "ECD(ppg) = MW(ppg) + APL(psi) / (0.052 × TVD(ft))",
  "note": "Screening-level engineering result. It does not replace a commercial simulator, a laboratory PVT measurement, or review by a qualified engineer. Well-control decisions must follow the operator's own procedures and a qualified engineer's review — this is an arithmetic conversion, not a kill-sheet."
}

Every response is wrapped in the same envelope: data plus warnings, sources, confidence, informational_only and a measured processing_ms. See the envelope reference.

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