Types of Drilling Fluids

• Compressed air

• Air/water

• Air/Polymer

• Water Based Mud (WBM)

• Oil Based Mud (OBM)

• Synthetic Based Mud (SBM)

Functions of Drilling Mud

• Remove cuttings from well

• Maintain wellbore stability

• Cool, lubricate and support the bit and drilling equipment

• Facilitate cementing and completion

Pouring a foaming agent down

Composition of Drilling Mud

• Additives– Bentonite Clay (gel), Barium Sulfate (barite)– Calcium Carbonite (chalk)

• Viscosifiers– Xanthum gum, guar, CMC

• Deflocculants– Acrylates, Polyphosphates, lignosulfonates