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172 Part III Underbalanced Drilling Systems
REFERENCES
GRI, 1997. Underbalanced Drilling Manual. Gas Research Institute Publication, Chicago.
Rehm, B., 2002. Practical Underbalanced Drilling and Workover. University of Texas at
Austin.
PROBLEMS
8.1 How does the pH value of drilling liquid affect the performance of
foaming agents?
8.2 What is the working principle of 4-phase separators?
8.3 Why do downhole deployment valves make UBD operations safer
and more cost effective?
