Process using gellan as a filtrate reducer for water-based drilling fluids
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United States of America Patent
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Apr 28, 1998
Issued Date -
N/A
app pub date -
Apr 15, 1996
filing date -
Dec 24, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to a process for controlling the permeability of the walls of the geologic formations drilled. The circulating drilling fluid includes a determined amount of gellan used as a filtrate reducer. In the process, the viscosity of the fluid is mainly controlled by polymers, such as xanthan, scleroglucan or wellan. The invention further relates to a drilling fluid including gellan.
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