BAKER HUGHES - Drilling Fluids Reference Manual

Water Based Drilling Fluids
6. When the fluid system becomes depleted of ALPLEX ® , any or a combination of the
following may be observed:
• The pH of the fluid drops below pH 10.0.
• The cuttings over the shakers will become soft and sticky. Blinding of the shaker
screens may occur.
• The fluid viscosity and rheological properties will generally increase.
• Tight spots, excessive torque and drag, and bit balling may develop.
Aluminum Determination by Fluoride Electrode
Equipment and Reagents
1. pH/mv Meter (Orion or instrument capable of using a fluoride electrode and having
concentration mode capabilities)
2. Combination Fluoride Electrode with BNC connector - Orion 9609BN (currently supplied
with Ionplus A Optimum Results filling solution
3. Reference Electrode Filling Solution - Orion Ionplus A Optimum Results filling solution (
Orion 900061) or IONALYZER reference electrode filling solution (Orion 900001)
4. Plastic Pipette - 0.5 or 1.0 ml
5. Plastic Beakers (2) - 150 ml
6. Plastic Graduated Cylinder(2) - 50 ml
7. Pipette (3 ml) or 10cc plastic syringe
8. Potassium Fluoride Solution - 0.0010 M (10 Standard)
Potassium Fluoride Solution - 0.010 M (100 Standard)
9. Acetic Acid/Potassium Acetate Buffer
Standards Preparation for Instrument Calibration
Note:
Graduated cylinders, beakers, and pipettes should be rinsed with distilled water and dried
between each use.
1. Place 30 ml of 0.0010 M(10 Standard) Potassium Fluoride solution into a plastic
graduated cylinder.
2. Pour the 30 ml of 0.0010 M Potassium Fluoride solution into a plastic beaker.
3. Deliver by pipette or 10cc plastic syringe 3 ml of the Acetic Acid/Potassium Acetate
Buffer into the plastic beaker of 0.0010 M Potassium Fluoride solution.
4. Swirl the beaker contents to ensure proper mixing. Allow the solution to set for five
minutes.
5. Place 30 ml of 0.010 M (100 Standard) Potassium Fluoride solution into a plastic
graduated cylinder.
Reference Manual
Baker Hughes Drilling Fluids
3-90 Revised 2006