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Geological Engineering: Proceedings of the 1st International Conference (ICGE 2007)

Editor
Baosong Ma
Baosong Ma
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ISBN:
9780791802922
No. of Pages:
1760
Publisher:
ASME Press
Publication date:
2009

Relative characteristics of XC and clay are discussed firstly, and the effects of the presence of clay, XC and the polyethylene glycol, and content of XC on drilling fluids are analyzed. The results show the interactions among NaCl, KCl, clay, polyethylene glycol and XC greatly affect the rheological behavior of drilling fluids, and there is a critical temperature in the low-temperature range at which the viscosity of drilling fluids increases rapidly. Adding clay increases viscosity and fluid loss of drilling fluids. With temperature higher than critical temperature, increment of the content of KCl and XC may reduce viscosity, and also reduces the low-temperature fluid loss later. With temperature lower than critical temperature, content of KCl should be reduced in order to avoid rapid increment of viscosity. For relative drilling fluid system, 5% polyethylene glycol with a molecular weight of 10000 and 0.25% XC combined with 15% NaCl + 5% KCl or 20% NaCl are suitable.

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