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Barite for Cementing
Product #4300
Barite (ground barium sulphate (BaSO4)) in its pure form is chemically inert in fresh water and oil based drilling fluids. It can be used to increase mud densities to as high as 2400 kg/m³.
Barite increases the hydrostatic pressure of the drilling mud allowing it to compensate for high-pressure zones experienced during drilling. The softness of the mineral also prevents it from damaging drilling tools during drilling and enables it to serve as a lubricant.
Application
Barite (20.4μ) has two major functions in cementing operations:
Weighting Agent - Used where high pore pressures, unstable wellbores and deformable plastic formations are controlled by high hydrostatic pressures. Slurries with densities of up to 2280 kg/m³ (19.0 lbs/gal) can be prepared with Barite to control such wells.
Plugs - A Barite plug will seal the wellbore due to the high hydrostatic head pressure of the slurry. In addition the Barite slurry has a high filtrate loss causing it to dehydrate rapidly forming a plug. The viscosity and yield point of the Barite slurry must be kept low if the Barite is to settle and form a plug.
Mixing & Handling
Barite can be mixed through the mud hopper as rapidly as needed. When large quantities are added to a mud system it may be necessary to add water to prevent mud dehydration. Additional water is required when blending Barite slurries (Barite Water Requirement = 0.04 L H2O/kg Barite).
Physical Properties
Appearance: Brown to grey powder
Specific Gravity: 4.2 - 4.4
Melting Point: 1580°C
200 Mesh Retention: 2%
325 Mesh Retention: 17%
Percentage Passing 6: 17%
Moisture (ASTM D-280): 0.02%
Bulk Density (ASTM C-110): Loose - 1730 kg/m³, Tapped - 2563 kg/m³
Chemical Properties
BaSO4: 92.8%
Fe2O3: 0.3%
CaO: 0.3%
MgO: 0.1%
Al2O3: 0.14%
Silicates: 4.6%
Loss on Ignition: 1.3%
Total Heavy Metals: 0.001%
Solubility: Insoluble
pH: 7.0 - 9.5
Packaging & Controls
WHMIS: Not controlled
TDG: Not regulated
Packaging: 40kg bag