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Formulas and Calculations

Formulas and associated calculations are important for design, drilling engineering and drilling operations. Few equations and related calculations are given in the following pages.

The intent is to provide basic equations and formulas for downhole drilling operations. The readers may find it as a tutorial guide. It is known that it will be very difficult to cover all the aspects and areas of drilling and it is hoped that the page will be updated with additional topics.


More details can be obtained from Drilling Calculations501 Solved Problems for Drilling Operations.


Glossary of Drilling Operations

The Oil Drilling (Video)

Conversion Factors

The Mud Lag Time (Video)

General Terms

Gel Strength

Mud Weight

Formation Pressures

Well Control Calculations

The General Calculations(Video)



The Halliburton RSS Point the Bit System (Video)

The Baker Hughes RSS Push the Bit System (Video)

The Weatherford RSS (Video)

The Schlumberger RSS Push the Bit System (Video)

The Gyrodata RSS (Video)

Mud Motor

The Dyna-Drill Motor (Video)

The Jaguar Mud Motor System (Video)

The Baker Hughes Navi-Drill (Video)

The Mud Motor Basic Function (Video)

The Hunting Mud Motors (Video)