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Development and Testing of Underbalanced Drilling Products DOE Contract No. DE-AC21-94MC31197 Final Report October 1995 – July 2001 Submitted to: U.S. DEPARTMENT OF ENERGY National Energy Technology Laboratory Attn: Roy Long 3610 Collins Ferry Road Morgantown, West Virginia 26505 By: William C. Maurer William J. McDonald Thomas E. Williams John H. Cohen MAURER TECHNOLOGY INC. 2916 West TC Jester Houston, Texas 77018-7098 Tel: (713) 683-8227 Fax: (713) 683-6418 TR01-16 July 2001