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.

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