1959年很多勘探队在党的领导厂开展了群众性的无套管钻进的研究与试验工作。短短一年就在全国各地,尤其是石油和煤田勘探地区获得迅速发展,并取得了显著成果。扭转了很多地区以往“下套管保险” In 1959, many exploration teams carried out mass-type casingless drilling research and experimental work at the Party’s leading factory. In just a year, the rapid development has been achieved in all parts of the country, especially in oil and coalfield exploration areas, with remarkable results. Reversed a lot of areas in the past, “under the casing insurance”