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Journal of Chemistry
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2015
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Article
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Tab 4
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Research Article
Polymer Drilling Fluid with Micron-Grade Cenosphere for Deep Coal Seam
Table 4
The evaluation of sedimentation stability (method of using measuring cylinder).
Initial density/g·cm
−3
Position
Measured density/g·cm
−3
Density difference/g·cm
−3
Phenomenon
0.865
Upper
0.864
0.002
No obvious change