Bentonite Used in Vertical Drilling Fluids

Bentonite CP-DRI is used in vertical drilling fluids to increase viscosity and filtration control. CP-DRI is also ideal in drilling fluids because it expands when exposed to water. This expansion helps down holes formations to be sealed from invading drilling fluids. The Drilling bentonite extracts the drill cuttings from around the drill bit, which are then floated to the surface. Bentonite also serves to cool and lubricate the drill bit as well as seals the drill hole against seepage and to prevent wall cave-ins. It is mainly use in fresh pure water rotary drilling conditions as water quality will affect bentonite performance.

Advantages:
Good suspension
High thixotropy
Little filtrated volume
Excellent capacity of making mud
Easy to adjust the density of the well drilling slurry

Typical properties:

Suspension Properties                      API SpecificationTypical Value  
Viscometer dial reading at 600r/minMin.30                  35                    
Yield point/plastic viscosity Ratio      Max.3                   2.4                    
Filtrate volume                                     Max.15 ml            12ml                
Residue of diameter greater than 75umMax mass fraction 4.0%3.0%

Application:
CP-DRI is suitable for all type of freshwater mud rotary drilling.
CP-DRI can also be used as a seal for earthen structures, slurry trenching, tunnel boring and foundation drill.

Mixing and dosage:
Mixing ratios are based on the use of freshwater; water purity will affect bentonite performance. For best results, acidic and hard make-up water should be pretreated with SODA ASH to a pH of 8.5-9.5. Add PREMIUM GEL slowly through jet/hopper mixer.The quantity of bentonite used is variable depending upon the depth of the hole to be drilled. Generally one tonne of bentonite is used to prepare about 100 barrels of mud.