Directional Drilling Calculation Example

Directional Drilling Calculation Example

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Directional Drilling Calculation Example by DrillingFormulas.Com on January 12, 2011 I got the question from my friend, Nien, asking me about directional drilling calculation and the question is shown below: Wellplanner is planning to design a deep kick-off well with a build section to by pass a salt dome section. He intends to achieve a horizontal departure of 1500 ft at the with the TVD at the target point to be 10,000 ft. Calculate the measure depth and build up rate.

Solution: First thing, I would like to draw a trigonometry diagram like this.

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Please keep in mind that this diagram I draw with the Power Point so it will not show good proportion but it can give you good idea on how to solve this problem. The formula for radius build (Rb) and length of hole (L) are listed below respectively;

Where; Rb = radius of build in ft q = build rate degree/ft θ = angle build in radius Data given:

Total TVD = 10,000 ft TVD in build section = 10,000 – 7,000 = 3,000 ft The horizontal departure = 1500 ft From the diagram, Rb = 1500 + Rb x cos ( θ) 1500 = Rb x (1- cos (θ)) — >Equation 1

Use the trigonometric relationship 3000 = Rb x sin (θ ) — >Equation 2

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Equation 2 ÷ Equation 1 so you will get like this

– >Equation 3

Square the Equation 3 so you will get

– >Equation 4

Arrange the Equation 4 and you will get like this:

– >Equation 5

According to the trigonometry relationship

Therefore you can change the Equation 5 like this:

– >Equation 6

Use the polynomial relationship to arrange the equation as shown below:

You will have two following answers: cos (θ) = 3/5 and cos ( θ) = 1 Then you need to check which answer is correct. cos (θ) = 1 is unreal because θ = 0 degree. Therefore, cos (θ) = 3/5 is the right answer for this case.

From the Equation 1, you will be able to get Rb via the Equat ion 1 1500 = Rb x (1- cos ( θ)) – >Equation 1 1500 = Rb x (1- cos (53.13)) 1500 = Rb x (1 – 3/5)

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Rb = 3750 ft

You can determine the length of build section via the equation below;

Total MD from the rig to end of the build section = 7000 + 3477.35 = 10,477.35 ft Determine build rate via this following equation:

q = 0.01528 degree/ft We can answer in degree/100 ft by multiplied 100 therefore you will get the answer like this. q = 1.53 degree/100 ft Conclusion of this question: The measure depth of the well = 10,477.35 ft The build-up rate = q = 1.53 degree/100 ft

Reference books:

Directional Drilling Books

Formulas and Calculations for Drilling, Production and Workover, Second Edition

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Related Topics from Drillingformulas.Com Dogleg Severity Calculation based on Radius of Curvature Method Radius of Curvature Method Angle Averaging Method in Directional Drilling Calculation Tagged as: Directional Drilling Calculation { 11 comments… read them below or add one }

Danny Retnadi June 1, 2012 at 5:58 am Very good web to get drilling practices. Reply

Kingsley Ekeadah November 28, 2012 at 1:22 am Drilling made easy for young Engineers Reply

samy June 2, 2013 at 3:19 am Dear Sir ton mile calculation formula for running liner casing is the same formula for running casing to surface. please advise Regards Reply

DrillingFormulas.Com June 3, 2013 at 4:29 pm The formula is the same but the weight of casing is not the same therefore ton-mile for running liner is lower. Reply

aras July 12, 2013 at 8:03 pm I can not understand the equation: 5cosθ^(2 )- 8cosθ +3 = 0

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Can someone explain to me the equation? tnx Reply

Edgar Nova September 25, 2013 at 9:18 am How can I detect a drilling break and a formation change when I am sliding the drill pipe in open hole? Thank you Reply

DrillingFormulas.Com September 25, 2013 at 4:30 pm ROP change is still a good indicator of drilling break even though you are sliding. Reply

Alireza October 19, 2013 at 7:16 pm Dear sir when we are sliding , what can we do when the string is hanging and don’t allow to slide ? Reply

DrillingFormulas.Com October 20, 2013 at 12:31 pm Then try again. Hanging off makes us very difficult to drill. There are several contributing factors affecting these as BHA compoment, formation, hydruluics, drilling parameters, etc.You need to pick up and work few times. Please keep trying. Reply

omar hassan November 10, 2014 at 2:05 am i do not found any thing about directional drilling articles …………………!!!!!!!!!!!!!!!!!!!!!!!!i need it toooooooooooooooooooooo much please. Reply

DrillingFormulas.Com November 10, 2014 at 5:46 am Hi, Please check this one. http://www.drillingformulas.com/category/directional-drillingcalculations/

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Regards, Shyne Reply Leave a Comment Name * E-mail * Website

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Directional Drilling Calculation Example

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