Total Pressure Loss through The Drilling System Without Bit

We’ve learned several calculations regarding pressure loss in the drilling system and today, we will combine all knowledge together so we will get the total pressure loss in the system excluding the bit.

Without downhole tool, the total pressure loss without bit is equal to summation of pressure loss at the surface equipment, pressure loss through drill string (drillpipe and drill collar) and pressure loss in the annulus.

The equation below demonstrates the system pressure loss excluding the bit:


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