Drilling Mud Properties — Fann 35 Field Quick Guide

By Othman Soliman — Solids Control & Drilling-Waste specialist, 26+ yrs (GCC & MENA). Last reviewed July 2026.

Free Fann-35 field guide per API RP 13B-1: PV, YP, AV, gels and LSYP formulas, dial-reading conversions, power-law n & k, plus the retort/MBT/sand tests — with a worked example.

What's inside the PDF

All rheology formulas: PV, YP, AV, gels, LSYP — straight from the dial readings
Conversions: shear stress ×1.066, shear rate ×1.703, power-law n & k
Worked example (R600=56, R300=35) and the three solids tests

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→ Drilling Fluids Fundamentals → PV & YP explained → Gel strength & thixotropy

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