There are 2 new well completions, that are hydraulic sand jet perforation and hydraulic slotted liner technique.
有2项新型完井工艺，即水力喷砂射孔和水力割缝。
The application of programmable controller enhances automatic grade of sand jet line of production with convenient operation and reliable performance.
用可编程序控制器控制钢管壁面喷砂除锈作业线，提高了自动化程度，操作方便，运行可靠。
The governing equations for a planar horizontal sand jet with interphase slip and heat transfer are constructed, and solved with the aid of the modified and extendcd general program.
构造了存在相间滑移和换热的平面水平含沙射流的封闭控制微分方程组；
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