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.
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.
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。
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