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Another way to determine equivalent circulating density (ECD) is to use yield point.

This formula below is used to calculate the ECD and it is good for mud weight less than or equal to **13.0 ppg.**

Where:

ECD is equivalent circulating density in ppg

MW is mud weight in ppg

Hold ID is inside diameter of hole in inch

Pipe OD is outside diameter of pipe in inch

YP is mud yield point

YP can be calculated by these following equations

YP = Reading at 300 rpm – PV

PV = Reading at 600 rpm – Reading at 300 rpm

**Determine the ECD with the following information**

MW = 9.2 ppg

Reading at 300 = 25

Reading at 600 = 40

Hole diameter = 6.2

Pipe diameter = 4

PV = 40 – 25 = 15

YP = 25- 15 = 10

ECD = 9.7 ppg

**Additional articles about Equivalent Circulating Density (ECD) are as follows:**

Equivalent Circulating Density (ECD) in ppg

Equivalent Circulation Density (ECD) with complex engineering equations

Effect of Frictional Pressure on ECD while reverse circulation

Effect of Frictional Pressure on ECD while forward circulation

**Ref book: ** **Formulas and Calculations for Drilling, Production and Workover, Second Edition**

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Good , but as I see this is calculated estimating that you have only one section of pipe and hole only . what about the BHA section , and what about if we have 2 types of pipes like 5.5 inch and 4 inch ….ect ? how can I apply this formula ?

Ahmed,

For this case, I will use 5.5 inch because it will give you the worst case calculation.

Best Regards,

Shyne.