Driller’s Method Quiz No. 1

In order to get more understanding about driller’s method, there are some quizzes that will help you get clear picture of it.

1st example –

Before start circulating, you have the following information

Original Shut in Drill Pipe Pressure = 500 psi

Initial Circulating Pressure (ICP) = 1500 psi

After end of 1st circulation of Driller’s Method, the drillpipe pressure gauge and the casing pressure gauge shows that the circulating drill pipe pressure = 1500 psi and casing pressure = 650 psi (see the figure below).

Do you think what is happening with the well?





Answer: There is influx (kick) remaining in well because casing pressure is higher than the original shut in drill pipe pressure. Additional circulation is required for this case.


Driller’s method concept is to hold bottom hole pressure constant therefore with neglecting frictional pressure, once influx in out of hole, you should see that casing pressure must be equal to initial shut in drill pipe pressure

Drill pipe side: BHP = Hydrostatic Pressure + Shut in Drill pipe pressure —> equation 1

Casing side: BHP = Hydrostatic pressure + Casing Pressure + Frictional Pressure —> equation 2

Neglect frictional pressure so we can write the formula like this.

Casing side: BHP = Hydrostatic pressure + Casing Pressure —> equation 3

With the assumption stated above, you will see that

equation 1 = equation 3

Then you will know that

Shut in Drill pipe pressure = Casing Pressure


Reference book: Well Control Books

Related Post

What is a Horizontal Subsea Tree? A subsea horizontal tree is designed so that all flow control valves are outside the central wellbore. A tubing hanger is located inside of a subsea h...
Why is Gas Flared? In petrochemical facilities and refineries flares are important for safety.  These burn the excess hydrocarbon gases in a safe manner as these can’t b...
Categories of Well Control Well control can be categorized into three main categories which are Primary Well Control, Secondary Well Control and Tertiary Well Control. The detai...
How to Determine Mud Motor Failure Mud motor failure downhole may be happened from time to time. The questions that are usually raised are things like “How do I know if the mud motor fa...
Share the joy
  • 3
Tagged , , . Bookmark the permalink.

About DrillingFormulas.Com

Working in the oil field and loving to share knowledge.

9 Responses to Driller’s Method Quiz No. 1

  1. man says:

    Hi Rachain,

    I need your assistance with the following questions:

    1. What is flow check? How is it executed?

    2. How does trip tank work? What is involved in the circulation system while tripping ie trip tank is connected to what etc? I only know the circulation system while drilling.

    Your response would be much appreciated. I have already tried to do some online searches but could not really get the answers yet.



    It would be nice if you can share some of your knowledge about the following topic

    (1) The kill and choke circuit i.e the kill line, the choke line and the low pressure circuit., Basically what is their function and how they are to be used?
    (2)Calculation of pore pressure and reservoir pressure.

  3. milud says:

    please read this equision and reply the right answer,

    if i get casing pressure is greater than MAASP, while the influx is inside the casing or out of the hole, what i can do?

    • You still need to circulate the influx out of the well. Since the influx is inside the casing, your casing shoe will not increase while the influx is moving.

      Even though you exceed the MAASP, you may not see the losses because while drilling, drilling mud can strengthen your shoe a little bit.

      Rachain J.

  4. mudassar says:

    respected sir,

    sir, r u have some daily reports of assistant drillers,drillers and toolpusher,
    i will be thankful to you.

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.