A drill sticking accident caused ZK001 borehole abandonment in Jiaozhuang iron ore area of Henan, the con-struction technology was improved by using proper equipment and high-quality mud, the final hole with depth of 1115.72m was reached with good technical indexes.Analysis is made on the borehole structure, drilling methods and properties of flushing fluid;the problems appeared in the construction and the countermeasures are briefly discussed.
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