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TREATMENT OF THE ACCIDENT WITH SCIENTIFIC DRILLING HOLE WFSD-3 IN THE WENCHUAN SEISMIC FAULT ZONE AND THE UNDERSTANDINGS

ZHANG Wen-sheng;ZHANG Zheng;No.313 Unit of Bureau of Geology and Mineral Exploration of Anhui Province;  
Hole WFSD-3 encountered a number of downhole accidents due to stratigraphic breakage, hole shrinkage and many unforeseen factors. After analysis of causes and treatment of different accidents such as drill collar tripping, run-casing sticking and bit burying, this paper improved and adjusted hole WFSD-3 construction techniques, summarized work experiences from prevention and treatment of scientific drilling hole accidents.
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