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Reduction of temperature while circulating and
drilling helps to maintain rheological properties of the mud and a reduction in the use of
additives
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Increased wellbore stability, reduction of corrosion of the drillpipe and
downhole tools, therefore a reduction of metal debris in the fluid
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Less impact on the performance
of downhole motors, MWD/LWD tools, electronic instrumentation,
especially important when drilling near the reservoir
in HPHT wells
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Increased ROP
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Increased
Bit life
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Increase
in transportation of drilling cuttings back to the surface
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