吐哈油田地层压力较低、储层物性较差，且要进行上返试油的井采用常规测试射孔联作技术已不能满足生产需要。
Formation of Tuha oilfield belongs to low pressure and bad reservoir property which makes conventional combing tech of testing and perforation not being suit for need of production of oil well.
环空管道后台阶突扩流动是空气正循环钻井过程中十分重要的关键部分，直接决定了钻探岩屑是否能够顺利上返地面。
The flow over a backward facing step of an annular tube is a very important part of air drilling, determining the detritus going back to the ground successfully.
在置换地基土才能使水泥掺入量满足设计要求的情况下，上返水泥土的存在改变了水泥掺入量的分配，桩体实际水泥掺入比随水泥土上返量大小及固相中水泥所占比例而改变。
The design of cement ratio is encountered by means of replacing the soil with grout, and the distribution of cement in the pile is changing with the return soil-cement.
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