When we used water, we saw the sand disturbed by the outflow from the tubing. However, the sand sank back to the bottom once the outflow stopped, as shown in these two photographs taken a few moments apart. |
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When we used shampoo, we saw the sand raised up by the outflow from the tubing. As the outflow stopped, the sand remained suspended in the shampoo, as shown in these photographs taken several minutes apart. |
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Like the water, a drilling mud with low viscosity has difficulty bringing cuttings to the surface from the bottom of a well hole. It would take a strong continuous current to do so. However, as we have seen with the shampoo, a high-viscosity drilling mud can bring cuttings to the surface even with a slow rate of flow. |
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