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.