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which of these layers are porous and permeable, and likely to
contain hydrocarbons.
Note: This figure shows the circulation path of the drilling mud. The mud is
pumped from the storage tank through a hose and swivel and down through the
drill string. It then passes through the drill bit and starts to move upward
through the annulus carrying rock cuttings with it. Back at the surface, it travels
through a hose and “shale shaker” (which removes the rock cuttings) and ends
up back in the storage tank.
Figure 4.5 - Circulation Path of Drilling Mud
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