There are 2 new well completions, that are hydraulic sandjet 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。
2
The application of programmable controller enhances automatic grade of sandjet 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。
3
The governing equations for a planar horizontal sandjet with interphase slip and heat transfer are constructed, and solved with the aid of the modified and extendcd general program.