These exercises have been developed to fit the content of the text book Drilling Fluid Engineering at . The understanding of the physics and mathematics of the processes has been in focus of both the book and the exercises. Many practical applications have also been created and entered into the collection of exercises. Most of the exercises have been solved by students in the corresponding course at the Department of Petroleum Engineering and Applied Geophysics at NTNU of Trondheim. If the readers have any comments that could improve the excersises, please contact me at . Any such comments will be worked into the next year’s issue.