A saturated saltwater drilling fluid based on salt-responsive polyampholytes
JIANG Guancheng,HE Yinbo,CUI Wuge,YANG Lili,YE Chenxi
Table 1 Influence of HvL and LvH on basic performance of base bentonite mud with saturated salt.
Sample Apparent viscosity/
(mPa·s)
Plastic
viscosity/
(mPa·s)
Yield point/
Pa
Φ6/Φ3 API fluid loss/mL
Base mud 8.5 6 2.56 8/7 139.8
Base mud +
2% HvL
52.0 31 21.46 5/4 4.1
Base mud+
2% LvH
18.0 12 6.13 4/3 22.0