Effect of Frictional Pressure on ECD while Forward Circulation

In this article, we will describe the effect of friction pressure on bottom hole pressure and equivalent circulating density while performing forward circulation.

What is forward circulation?

It is the typical circulating path which is from a mud pump into drill pipe. Mud is pumped down into drill string / BHA and come out of a bit.  Then, the mud is flown up the annulus and return back to surface as you can see in the diagram below (Figure 1).

Figure 1 – Forward Circulation Path

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