Maximum Initial Shut-In Casing Pressure (MISICP)

Maximum Initial Shut-In Casing Pressure (MISICP) or Maximum allowable shut in casing pressure is the initial shut-in casing pressure that will exceed formation strength at the casing shoe resulting in broken formation at the shoe.

How can we know and calculate the MISICP?

Leak Off Test (LOT) will tell you the maximum pressure which the shoe can withstand before breaking formation at the shoe. The LOT is the combination of surface pressure and hydrostatic pressure therefore you can apply this principle to calculate the MISICP.

The MISICP formula is listed below:

MISICP, psi = (LOT, ppg – Current Mud Weight, ppg) x 0.052 x TVD of shoe, ft

Please see the example demonstrating how to calculate the MISCIP by using the following information:

LOT = 15.0 ppg

Current mud weight = 10.0 ppg

Casing shoe depth = 4526’MD/4200’TVD

MISICP, psi = (15 – 10) x 0.052 x 4200

MISICP = 1,092 psi

Note: Please ensure that you use the TVD for calculating the MISICP.


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

Well Control Books

Related Post

Increase In Mud Weight Due To Cutting Cutting generated while drilling will increase drilling fluid density and it will finally affect equivalent circulating density while drilling. In thi...
Pipe Displacement Calculation Pipe displacement, normally in bbl/ft, is steel volume to displace fluid volume.  When we either pull out of hole or trip in hole for any kind of pipe...
The Deepwater Horizon Got Explosion and Fire ̵... I just saw NEWS from the TV showing The Deepwater Horizon Got Explosion and Fire - 12 People Missing. Read news below. I wish they will find those peo...
D Exponent Calculation D exponent is an extrapolation of drilling parameters to get a trend while drilling into over-pressured zones. Usually, mud logger will correct all da...
Share the joy
  • 20
Tagged , . Bookmark the permalink.

About DrillingFormulas.Com

Working in the oil field and loving to share knowledge.

7 Responses to Maximum Initial Shut-In Casing Pressure (MISICP)

  1. milud says:

    if the casing pressure exceeds the MAASP while the influx is inside the casing, in this case could i shut in the well or carry on every is ok? please find for me the right answer. thank you.

    • You should carry on. Your casing shoe may or may not be broken because the mud sometimes strengthen the shoe.
      You need to reduce kill rate in order to reduce overall pressure which will help you.

  2. click here says:

    My partner and I stumbled over here coming from a different website and thought I might as well check
    things out. I like what I see so now i’m following you. Look forward to finding out about your web page yet again.

  3. Iam in Dire need of all drilling equipment and tools for various drilling operations: Example, Swamp. Shallow water, Deepwater, Offshore and Onshore environment,.

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.