WF 2 : Wellhead flange. The flange on the first cemented string of casing to which the BOP is bolted during drilling and on which the wellhead is built after drilling
George E. King Engineering, 5000 Oilfield Terms: A Glossary of Petroleum Engineering Terms, Abbreviations and Acronyms, US 2010. http://gekengineering.com/Downloads/Free_Downloads /Glossary_of_Petroleum_Engineering_Terms_25_August _2010.pdf, (Oil - Amer) {593}