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Stimulus-responsive mechanism of salt-responsive polymer and its application in saturated saltwater drilling fluid
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HE Yinbo,JIANG Guancheng,DONG Tengfei,YANG Lili,LI Xiaoqing
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Table 3 Basic properties of saturated saltwater drilling fluids.
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Drilling fluid
formula | Test condition | Density/
(g·cm-3) | Apparent visco-
sity/(mPa·s) | Plastic visco-
sity/(mPa·s) | Yield
point/Pa | (Initial gel strength/
final gel strength)/Pa | High-temperature high-
pressure fluid loss/mL | | 1# | Before hot-rolling | 1.80 | 88.5 | 70 | 18.91 | 4.0/6.5 | — | | After hot-rolling | 84.5 | 67 | 17.88 | 4.0/6.0 | 7.8 | | 2# | Before hot-rolling | 1.80 | 17.5 | 17 | 0.51 | 0.5/0.5 | — | | 3# | Before hot-rolling | 1.80 | 77.5 | 64 | 13.80 | 3.0/5.0 | — | | After hot-rolling | 73.5 | 61 | 12.78 | 3.0/5.0 | 8.4 | | Before hot-rolling | 2.00 | 84.0 | 70 | 14.31 | 3.5/6.5 | — | | After hot-rolling | 78.0 | 68 | 10.22 | 3.0/6.5 | 7.7 | | Before hot-rolling | 2.20 | 91.5 | 77 | 14.82 | 5.0/7.0 | — | | After hot-rolling | 81.5 | 71 | 10.75 | 4.5/6.5 | 7.1 |
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