Adjustable drill rod disassembly and assembly fixing device von SONG SHIXIN, ZHU DUOLIN, LI FOYA, LI YANGYANG, HU PENGFEI, CHAO RUI, LIU PENGCHENG, LI JINHAO, CHEN CHEN, WANG SHENGLI, ZHOU QIANGJUN, HAN XIAOMENG, LIU PENGFEI, YUE YINGMIN, ZHANG QIFENG, YANG LI, LI JIANQIANG, HAN ZIJUN, JIAO XIANGYING, ZHANG WEI, WANG KEDONG, DU YANG

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Detachable wellhead reinforcing and protecting device von LIU JINGJING, SONG SHIXIN, ZHU DUOLIN, LI FOYA, HU PENGFEI, LIU PENGCHENG, LI JINHAO, CHEN CHEN, HUANG FENG, WANG SHENGLI, WANG QIANG, ZHOU QIANGJUN, HAN XIAOMENG, LI ZHAOGANG, LIU PENGFEI, YUE YINGMIN, ZHANG QIFENG, YANG LI, LI XUANZHE, HAN ZIJUN, WANG KEDONG, DU YANG

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