Clay concentration of drilling mud (methylene blue test)
Input(s)
\(V_{m b}\): Volume of Methylene Blue used in Experiment, meq/100 mL (mL)
\(V_{d m}\): Volume of Drilling Mud used in Experiment, meq/100 mL (mL) \(V_{s c}\): Volume of Solid Content (Cuttings or Bentonite) in Drilling Mud, meq/100 mL (g)
\(M B T_{m}\): Methylene Blue Result of Drilling Mud (mL/mL)
\(M B T_{d s}\): Methylene Blue Result of Drilling Cuttings \((\mathrm{mL} / \mathrm{mL})\)
\(M B T_{m}\): Methylene Blue Result of Clay \((\mathrm{mL} / \mathrm{mL})\)
Output(s)
\(f_{c}\): Clay Content Ratio in Drilling Mud (fraction)
\(C_{c}\): Clay Concentration in Drilling Mud (lb/bbl)
Formula(s)
\[
\begin{gathered}
\mathrm{MBT}_{\mathrm{m}}=\frac{\mathrm{V}_{\mathrm{mb}}}{\mathrm{V}_{\mathrm{dm}}} \\
\mathrm{MBT}_{\mathrm{ds}}=\frac{\mathrm{V}_{\mathrm{mb}}}{\mathrm{V}_{\mathrm{sc}}} \\
\mathrm{MBT}_{\mathrm{c}}=\frac{\mathrm{V}_{\mathrm{mb}}}{\mathrm{V}_{\mathrm{sc}}} \\
\mathrm{f}_{\mathrm{c}}=\frac{\mathrm{MrBT}_{\mathrm{m}}-2.6 \cdot \mathrm{f}_{\mathrm{lg}} \cdot \mathrm{MBT}_{\mathrm{ds}}}{2.6\left(\mathrm{MBT}_{\mathrm{c}}-\mathrm{MBT}\right.} \\
\mathrm{C}_{\mathrm{c}}=\mathrm{f}_{\mathrm{c}} \cdot 21.7 \frac{\mathrm{lb}}{\mathrm{gal}} \cdot 42 \frac{\mathrm{gal}}{\mathrm{bbl}}
\end{gathered}
\]
Reference(s)
Altun, G., Drilling Fluids Lab, Course Notes, ITU Petroleum and Natural Gas Engineering, Istanbul, Turkey, 2013-2014. Experiment 3, Page: 4.