Hydrostatic Pressure Calculation

Hydrostatic pressure is created by fluid column. Two factors affecting hydrostatic pressure are mud weight and True Vertical Depth. In this article, it will demonstrate how to calculate hydrostatic pressure in different oilfield units.


1. Calculate hydrostatic pressure in psi by using mud weight  in pound per gallon (ppg) and feet as the units of True Vertical Depth.

Hydrostatic pressure equation:

Hydrostatic Pressure (HP) = mud weight in ppg x 0.052 x True Vertical Depth (TVD) in ft

Example: mud weight = 12.0 ppg
True Vertical Depth = 10,000 ft
HP = 12.0 ppg x 0.052 x 10,000 ft
HP = 6,240 psi

2. Calculate hydrostatic pressure in psi by using pressure gradient in psi/ft and feet as the units of True Vertical Depth.

Hydrostatic pressure equation:

Hydrostatic Pressure (HP) = Pressure gradient in psi/ft x True Vertical Depth (TVD) in ft

Example: Pressure Ggradient = 0.5 psi/ft
True Vertical Depth = 10,000 ft
HP = 0.5 psi/ft x 10,000 ft
HP = 5,000 psi

3. Calculate hydrostatic pressure in psi by using mud weight in lb/ft3 and feet as the units of True Vertical Depth.

Hydrostatic pressure equation:

Hydrostatic Pressure (HP) = 0.006944 x mud weight, lb/ft3 x TVD, ft

Example: mud weight = 80 lb/ft3 true vertical depth = 10,000 ft
HP = 0.006944 x 80 lb/ft3 x 10,000 ft
HP = 5,555 psi

4. Calculate hydrostatic pressure in psi by using mud weight in PPG and meters as unit of True Vertical Depth.

Hydrostatic pressure equation:

Hydrostatic Pressure (HP) = mud weight, ppg x 0.052 x TVD in meters x 3.281

Example: Mud weight = 12.0 ppg true vertical depth = 5000 meters
HP = 12.0 ppg x 0.052 x 5000 x 3.281
HP = 10,237 psi

Download the Excel sheet for calculating hydrostatic pressure

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 Engineers.

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23 Responses to Hydrostatic Pressure Calculation

  1. Pingback: How much pressure will we see at cement head in case of float shoe fail?‎

  2. Pingback: Hydrostatic Pressure Calculation VDO Learning‎

  3. Pingback: Estimated mud weight required to safely drill the well‎

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  6. hamza says:

    how to calculat hydrostatic pressure in kg/ltter
    thanks

  7. leslie says:

    i want know how i can calculate the pressure at casing shoe,1000 psi at surface test and tvd of csg shoe 7500 ft and 11.0 ppg for fluid test?

  8. magnus says:

    I love this site

  9. Cristi says:

    Leslie, what did you mean by surface pressure? The pumping pressure?

  10. Deni says:

    I like this site very much,

    Very simple and great explaination.
    Very helpful

  11. behzad says:

    hello , I need to how to calculate the hydrostatic pressure with softwares .is there any software which is able to calculate that?

  12. Mahmoud Nabil says:

    I like this site too much (very simple and great info explaination

  13. SB Mishra says:

    I like this site, very helpful

  14. Alan Jorge says:

    a little help to solve the problem …A well has been shot in at 10500 TVD, due to flow out increase. MW is 11.5 ppg and SIDPP reaches 600 psi.
    What will be the the final STAND PIPE PRESSURE with the kill mud if the initial circulation BEFORE the kick was 2300 psi ?

    • Hi Alan,

      This is the answer.

      ICP = SCR + SIDPP
      2300 = SCR +600
      SCR = 1700 psi

      KMW = OMW + SIDPP/(0.052 x TVD)
      KMW = 11.5 + 600 / (0.052 x 10,500)
      KWM = 12.6 ppg

      FCP = ICP x (KMW/OMW)
      FCP = 1,700 x(12.6/11.5)
      FCP = 1,863 psi

      Final circulating pressure = 1,863 psi.

  15. sss says:

    how to know hydrostatic pressure difference after cement column set

  16. Samuel Tobung says:

    This site is very helpful. Thanks

  17. Dear sir
    This is a v good information for new comers in this field.
    If you again start Quiez program it’s much better

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