位于新疆塔里木东河塘油田的DH 4- 8井是目前国内裸眼侧钻点最深、裸眼井段最长的定向开发井。
The DH4-8 well, located at Donghetang Oilfield in Tarim Basin, Xinjiang, is a directional production well with the deepest open hole sidetrack point and the longest open hole section.
生产封隔器或者测试封隔器可能下入下套管的井段，而膨胀式封隔器可以在裸眼井段使用，也可以在下套管井段使用。
Production or test packers may be set in cased holes and inflatable packers are used in open or cased holes.
复杂压力系统钻井是当今钻井技术领域的世界性难题，钻井过程中常常碰到多个不同压力梯度的地层处于同一裸眼井段中。
Drilling with complex pressure system is a worldwide difficult problem. Several different pressure gradient stratums exist in the same bare hole section, which is very common in the drilling process.
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