Oil-Base Drilling Fluid 2
Oil-Base Drilling Fluid 2 :
The term oil-base drilling fluid is applied to a special type drilling fluid where oil is the continues phase and water the dispersed phase. Such fluids contain blown asphalt and usually 1 to 5 percent water emulsified into the system with caustic soda or quick lime and an organic acid. Silicate, salt, and phosphate may also be present. Oil-base drilling fluids are differentiated from invert-emulsion drilling fluids (both water-in-oil emulsions) by the amounts of water used, method of controlling viscosity and thixotropic properties, wall-building materials, and fluid loss. (Bul D11)
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