The development of radial horizontal welldrillingtechnology was under the studies on swirling jet theory and rock failure mechanism.
旋转射流理论和破岩机理研究，研制了径向水平钻井技术。
2
The traditional technique of salt well repairing and controlling in Zigong area is an important part in the system of Chinese welldrillingtechnology.
自贡地区的传统修治井技术，是中国古代钻井技术体系中的重要组成部分。
3
The undermine method of welldrillingtechnology once of blasting is put forward as well as the calculation of blasting parameters and the demand of implementation for hole.