YP/PV is considered as the best indicator for mud rheology. Most of the researchers find YP/PV to report rheology and they propose if the value lies in 0.75-1 lb/ft2/cp range , their mud is good. Is there any real significance of YP/PV value as I know it is used as a cutting transportation index but is there any logical reasoning behind the proposed range?
YP/PV values has been studied by several researchers and exact range is quite debatable however while deciding a desirable range following works are considered:
Works of Chilingarian (1983) shows, lower YP/PV ratio indicates stabilization of mud whereas, standard text of Caenn(2011) mentions higher YP/PV ratio is desirable for better hole-cleaning.
Therefore, in order to obtain an optimum value of YP/PV, a mutually conflicting decision needs to be taken as both stability in terms of deflocculated condition and hole cleaning ability is essential for mud.
Several authors have studied ideal range of YP/PV of which studies of Okrajni (1986) suggest a range of 0 - 2. Gautam et al., (2020) 1 - 2.
For further studies you can refer:
Composition and Properties of Drilling and Completion Fluids, Composition and Properties of Drilling and Completion Fluids , Caenn(2011)
The Effects of Mud Rheology on Annular Hole Cleaning in Directional Wells. Okrajni 1986
Drilling Fluid Evaluation Using Yield Point-Plastic Viscosity Correlation - Chilingarian , 1983
Optimal Synthesis, Characterization, and Performance Evaluation of High-Pressure High-Temperature Polymer-Based Drilling Fluid: The Effect of Viscoelasticity on Cutting Transport, Filtration Loss, and Lubricity , Gautam (2020)
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