Magnetic and Gravity Toolface and How to Interpret the Meaning for Directional Drilling

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Magnetic and Gravity Toolface and How ToInterpret The Meaning For Directional Drillingby DrillingFormulas.Com on November 22, 2014

Magnetic and gravity tooสface are terms in directional drilling world to describe the direction of the well.They are different in meaning and application therefore this article will teach you about theseterminologies and how to read it.

Magnetic ToolfaceThe magnetic toolface is an angle projection onto the horizontal plane between the tool face and magneticnorth. Typically, directional tools use the magnetic tool face when the inclination is less than 5 degree. TheFigure 1 demonstrates that the mud motor is lined up to kick off at 30 degree azimuth magnetic.

Magnetic and Gravity Toolface and How To Interpret The Meaning For ... http://www.drillingformulas.com/magnetic-and-gravity-toolface-and-ho...

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Figure 1 – Magnetic Toolface

Gravity ToolfaceThe gravity toolface or high-side toolface is used for a section of the well which has an inclination morethan 5 degree. The high-side is the top of the hole perpendicular to the wellbore axis and the low side isthe bottom of the hole (Figure 2). The tool is measure in relative to high-side tool face.


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Figure 2 - Gravity Toolface (High Side Toolface)

What Does Toolface Tell You About Directional Drilling?

Toolface at 0 degree – it means that a mud motor is lined up to build angle only but there is no change inazimuth.


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Figure 3 - Toolface at 0 Degree

Toolface at 180 degree - it means that a mud motor is lined up to drop angle only but there is no changein azimuth.


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Figure 4 - Toolface at 180 Degree

Toolface at 90 degree – it means that a mud motor is lined up to turn the right only but there is no changein inclination.


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Figure 5 – Toolface at 90 degree

Toolface at 270 degree – it means that a mud motor is lined up to turn the left only but there is no changein inclination.


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Toolface at 45 degree - it means that a mud motor is lined up to turn the right and build angle.


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Figure 7 - Toolface at 45 degree

Toolface at 135 degree - it means that a mud motor is lined up to turn the right and drop angle.


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Figure 8 - Toolface at 135 degree

Toolface at 225 degree - it means that a mud motor is lined up to turn the left and drop angle.


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Toolface at 315 degree - it means that a mud motor is lined up to turn the left and build angle.


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Summary – The illustration below shows the meaning of the toolface on each location.


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Figure 11 – Toolface Diagram Summary

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Tagged as: directional drilling, grativty toolface, magnetic toolface

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12 de 17 25/03/2015 03:37 p.m.

jose mendez November 26, 2014 at 9:27 pm

Magnetic tool

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jose mendez November 26, 2014 at 9:37 pm

Macnetic toolface

Reply

Arekumo ThankGod December 29, 2014 at 8:05 pm

Nice site. I need your articles from time to time.

Reply

Enyindah Joseph March 6, 2015 at 1:20 am

It nice and educative

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Magnetic and Gravity Toolface and How to Interpret the Meaning for Directional Drilling