This paper presented the drilling problems and main techniques in each interval of Chuanhe 139 Well.

介绍了川合139井各井段钻井施工难点及主要技术措施。

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The precision of stack velocity and interval velocity provided by common NMO correction processing method can't meet the need of predicting the pre-drilling press.

常规动校正处理方法提供的叠加速度及层速度精度不能满足钻前压力预测的需要。

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During drilling operation, the track in horizontal interval is controlled and the hang sidetrack drilling technology is successfully used.

在钻井施工中精确控制了水平段轨迹，应用了悬空侧钻技术。

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In a lot of wells I saw that the zone was taking drilling mud, soaking it up and leaving a layer of mud cake across a permeable interval of the wellbore.

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