What are the differences between Formation Integrity Test (FIT) and Leak Off Test (LOT).? (2024)

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You may confuse between Formation Integrity Test (FIT) and Leak Off Test (LOT).

What are the differences between Formation Integrity Test (FIT) and Leak Off Test (LOT).? (1)

They are different in this following aspect.

Leak Off Test – you pressure test shoe and formation until formation break down.

Let’s I explain more about it: Leak off Test is conducted in order to find the fracture pressure (fracture gradient) of formation and shoe. When conducting the LOT, you will pump drilling fluid to until you see the fracture trend of formation. Once formation is fractured, the first pressure that deviated from a trend is typically called Leak Off Pressure. We use the leak off pressure to calculate LOT.

Formation Integrity Test – you test strength of shoe and formation to designed pressure.

Let’s I explain more about it: Formation Integrity Test is typically used for testing strength of formation and shoe by increasing Bottom Hole Pressure (BHP) to designed pressure. When you do the FIT test, you will increase surface pressure until it reaches the required pressure only. There is no intention to break the formation with FIT. You will do FIT to ensure that you will be able to drill to section target depth and will be able to control the well in case of well control situation without underground blow out.

In term of a calculation, both FIT and LOT have the same formulas. You can read more detailed calculations about Formation Integrity Test (FIT) and Leak Off Test (LOT).

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

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What are the differences between Formation Integrity Test (FIT) and Leak Off Test (LOT).? (2)

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15 Responses to What are the differences between Formation Integrity Test (FIT) and Leak Off Test (LOT).?

  1. What are the differences between Formation Integrity Test (FIT) and Leak Off Test (LOT).? (3)kolawole adetokunbo says:

    December 2, 2010 at 9:46 pm

    nice explanation about FIT & LOT

    Reply

    See Also
    Procedures for leak-off and limit tests (LOT, LT, FIT)Leak Off Test Procedures & Calculations Sheet - Drilling Manual

    • What are the differences between Formation Integrity Test (FIT) and Leak Off Test (LOT).? (4)DrillingFormulas.Com says:

      December 2, 2010 at 10:49 pm

      Thanks for your comment.

      Reply

  2. What are the differences between Formation Integrity Test (FIT) and Leak Off Test (LOT).? (5)kolawole adetokunbo says:

    December 2, 2010 at 9:50 pm

    IT IS NOT EVERYBODY CAN DIFFRENTIATE BTW THE TWO TEMS

    Reply

  3. What are the differences between Formation Integrity Test (FIT) and Leak Off Test (LOT).? (6)Almaz says:

    June 27, 2013 at 10:23 pm

    Just to clarify – so, LOT and FIT are done after drilling rat hole out of casing shoe? And LOT pressure is greater than FIT pressure?

    Reply

    • What are the differences between Formation Integrity Test (FIT) and Leak Off Test (LOT).? (7)DrillingFormulas.Com says:

      July 7, 2013 at 10:40 am

      Yes, they are done after drilling rat hole. You need to check formation samples to verify if you drill into formation. yes, LOT is greater than FIT.

      Reply

  4. What are the differences between Formation Integrity Test (FIT) and Leak Off Test (LOT).? (8)Oluseye Ogunyemi says:

    August 10, 2013 at 7:16 am

    I think we can also define FIT pressure as that point equivalent to the fracturation pressure at which the hydrostatic pressure is sustained by the formation pressure in the rat hole for a defined time while the LOT pressure is that beyond the the fracturation pressure at which the hydrostatic pressure is not sustained by the formation pressure.

    Reply

  5. What are the differences between Formation Integrity Test (FIT) and Leak Off Test (LOT).? (9)engineer says:

    April 3, 2014 at 1:26 am

    whats mean lot

    Reply

  6. What are the differences between Formation Integrity Test (FIT) and Leak Off Test (LOT).? (10)nizam says:

    April 20, 2014 at 6:13 pm

    Nice explanation, thank you for it.

    For LOT, we cement again to close the fracture in order to proceed further drilling, yes?

    Thanks
    Nizam

    Reply

    • What are the differences between Formation Integrity Test (FIT) and Leak Off Test (LOT).? (11)DrillingFormulas.Com says:

      April 21, 2014 at 9:45 am

      Nizam,

      Typically, the cement will not be performed in order to close the fracture. You will start drilling after LOT.
      In some special cases, you may need to do cement squeeze to strengthen the shoe if you don’t get minimum LOT.

      Regards,
      Shyne.

      Reply

  7. What are the differences between Formation Integrity Test (FIT) and Leak Off Test (LOT).? (12)Ahmed says:

    June 15, 2014 at 1:23 am

    Actually, we did two times FIT test, but the test is negative, now we performed squeeze.

    Reply

  8. What are the differences between Formation Integrity Test (FIT) and Leak Off Test (LOT).? (13)ern says:

    July 29, 2015 at 7:03 pm

    dude, really?

    i live for and love short and sweet explanations!!! thanks…

    Reply

  9. What are the differences between Formation Integrity Test (FIT) and Leak Off Test (LOT).? (14)Nilesh says:

    August 5, 2015 at 4:24 am

    When exctlu we do FIT and LOT ??

    Reply

  10. What are the differences between Formation Integrity Test (FIT) and Leak Off Test (LOT).? (15)Nilesh says:

    August 5, 2015 at 4:25 am

    When exactly we do FIT and LOT??

    Reply

    • What are the differences between Formation Integrity Test (FIT) and Leak Off Test (LOT).? (16)DrillingFormulas.Com says:

      August 8, 2015 at 10:02 am

      FIT is used when you want to reach only the designed shoe pressure. This will confirm the well design criteria.
      LOT is tested until the formation is fracture. You will know formation strength and it will tell you if your designed limit is acceptable for drilling next section.

      Regards,
      Shayne

      Reply

  11. What are the differences between Formation Integrity Test (FIT) and Leak Off Test (LOT).? (17)dlovan says:

    January 20, 2019 at 7:13 am

    Thanks good information and explaining in the easier way

    Reply

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