Pressure Loss and Equivalent Circulating Density Review

This example that I got from my junior member is very simple but it helps you a lot to understand about how to determine pressure loss during normal circulation.

Information given is listed below;

Pressure Loss and Equivalent Circulating Density Review

Circulate at 3 bottom up through open end tubing (Down tubing and up annulus) with 12.7 ppg mud.

Pump pressure = 1000 psi

Annulus friction loss = 50 psi

Inside tubing friction loss = 925 psi

Surface line friction loss = 25 psi

Calculate the pressure in the well at 10,000’ (tubing tail).

What would ECD at 10,000’ TVD be?

The concept of calculation that you should know : total pressure at bottom = pumping pressure + hydrostatic pressure – pressure loss in the opposite way of fluid flowing.

Then,

If I reference to the drill string site, I will get the equation like this.

Pressure at bottom hole= Hydrostatic Pressure at bottom hole + Pressure from pump- Pressure Loss in surface line – Pressure loss in tubing

Pressure in the well at 10,000’ = 0.052×12.7×10000 + 1000 – 25 – 925 = 6654 psi

If I reference to the annulus site, I will get the equation like this.

Pressure at bottom hole= Hydrostatic Pressure at bottom hole +Annular pressure loss

Note: Hydrostatic pressure and annular pressure loss force downward.

Pressure in the well at 10,000’ = 0.052×12.7×10000+ 50 = 6654 psi

Note: It doesn’t matter which site of u-tube you refer to the bottom hole pressure is still the same.
ECD (Equivalent Circulating Density) is calculated by this following equation:

ECD = Current mud weight in PPG + (annular pressure loss /(0.052xTVD))

ECD = 12.7 + (50/(0.052 x 10000))

ECD = 12.8 ppg

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

Related Post

Estimate Type of Influx (kick) From the previous topic, estimate Height of Influx, you can use influx height to estimate type of influx. The following equation is used for estima...
Lost Circulation and Well Control Lost circulation is a situation when drilling fluid losses downhole because formation(s) is fractured. There are three levels of lost circulation whic...
Calculate Cement (Oil Well Cement) Volume Required Cement volume calculation is based on annular capacity multiplied by length of cement as per cement program. This topic will demonstrate you how to de...
Angle Averaging Method in Directional Drilling Cal... You can calculate North, East and TVD between directional surveys based on the Angle Averaging Method as per formula below: Where; MD = measur...
Share the joy
  •  
  •  
  •  
  •  
  •  
  •  
  •  
  •  
  •  

About DrillingFormulas.Com

Working in the oil field and loving to share knowledge.
Tagged , . Bookmark the permalink.

6 Responses to Pressure Loss and Equivalent Circulating Density Review

  1. Pingback: Pressure Loss and Equivalent Circulating Density Review - Reverse Circulation‎

  2. Manuel says:

    I ve been use this grup to be more informed about oil industry a my personal knowlege and has been helpful. I do not have experience in industry yet. thanks to all of you.

  3. mouyembe says:

    helpfull informations, it really helped me to catch this

  4. Balamurugan says:

    Useful info.

  5. Mohanad alhabbal says:

    can you please do dubble check of ECD formula I thing it is not correct.
    E.C.D = BHP+ Annulus press./0.052*TVD

    thanks

Leave a Reply

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