Accident Treatment for Assembly Dropdown in Small Diameter Borehole with Eccentric Cutting Knife

详细信息   
摘要
Cutting drilling pipe and the assembly with eccentric cutting knife are usually applied in the large diameter engineering borehole construction;and in geological drilling, eccentric cutting knife can used to cut the casing pipe or coring barrel.The paper described a successful treatment practice of complex borehole accident in a drilling construction in Guizhou Province, the drilling pipe was cut down from the outside with eccentric cutting knife, and introduced the technical measures and the attentions.
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