Equivalent Circulating Density (ECD) in ppg

Equivalent Circulating Density (ECD) is the effective density that combines current mud density and annular pressure drop. ECD is vital for drilling engineering since it limits how depth of each section to be drilled and leads to losses.

semi

The equivalent circulating density formula is shown below

Equivalent Circulating Density (ECD) in ppg = (annular pressure loss in psi) ÷ 0.052 ÷ true vertical depth (TVD) in ft + (current mud weight in ppg)

Example:

Annular pressure loss = 400 psi
True Vertical Depth = 8,000 ft
Current mud weight in ppg = 10 ppg

ECD in ppg = (400 psi ÷ 0.052 ÷ 8,000 ft) + 10.0 ppg

ECD = 11.0 ppg

Please find the Excel sheet to calculate equivalent circulating density (ECD)

Ref books: Lapeyrouse, N.J., 2002. Formulas and calculations for drilling, production and workover, Boston: Gulf Professional publishing.

Bourgoyne, A.J.T., Chenevert , M.E. & Millheim, K.K., 1986. SPE Textbook Series, Volume 2: Applied Drilling Engineering, Society of Petroleum Engineers.

Mitchell, R.F., Miska, S. & Aadny, B.S., 2011. Fundamentals of drilling engineering, Richardson, TX: Society of Petroleum Engineer

Related Post

Total Flow Area (TFA) Total Flow Area (TFA) is summation of nozzle areas which fluid can pass through. When you consider about the TFA, you need to count all nozzles that y...
Pressure and Force Relationship and Its Applicatio... Relationship of pressure, force and cross sectional area is one of the most commonly used concepts in oilfield and we will review this concept and its...
Starting volume of original mud (weight up with Ca... You know how much volume will be increased due to adding calcium carbonate into the system; however, you sometimes are limited to total volume due to ...
Starting volume of original mud (weight up with Ba... You know how much volume will be increased due to adding barite into the system; however, you sometimes are limited to total volume due to limit pit v...
Share the joy
  • 168
  •  
  •  
  •  
  •  
  •  
  •  
  •  
  •  
    168
    Shares
Tagged , , . Bookmark the permalink.

About DrillingFormulas.Com

Working in the oil field and loving to share knowledge.

14 Responses to Equivalent Circulating Density (ECD) in ppg

  1. Andrew oloko says:

    I love well control and answers.

  2. Mahsun Hammedi says:

    Why you only use annular pressure drop?
    what about pressure loss inside the pipes?

    • Mahsun,

      The reason why using annular pressure drop is the direction of pressure drop acting downward which cause additional pressure to the bottom hole. The drill pipe pressure loss is acting upward therefore it cannot be used for ECD calculation.

      Regards,
      Shyne.

  3. Francis Okoto says:

    How can we use this during cement to calculate the ECD especially during cement displacement.

  4. Egede Frank Chukwueku says:

    plenty thanks to you all. its great to be part of this group

  5. Arslan says:

    Can we calculate the ECD if the surface pressure is not equal to zero? Or the surface pressure does not matter?

  6. Mide says:

    Whoa I love this platform. Please I would like to know the relationship between ECD and EMW

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.