Back flow prevention type oil well pipe column dropping prevention device

• Main Authors: ZHOU YANGFAN, LIU JIAWEN, YUAN HUIYING, TANG FAN, YANG HUANYING, FENG JIANSHE, LUO CONGYING, LU MEI, LING YONGGANG, WANG SHANGWEI, REN PENG, YAO YANG, CHANG PENGXU, CHENG HAO, WU ZONGFU, HUO CHUNSHAN, CHANG YANRONG, LUO YOUGANG, JIANG TIANHAO
• Format: Patent
• Language: Chinese; English
• Published: 19.11.2014
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

The utility model discloses a back flow prevention type oil well pipe column dropping prevention device, and belongs to the technical field of back flow prevention inverse well flushing. The back flow prevention type oil well pipe column dropping prevention device is characterized in that the upper end of an upper connector is connected with an oil pipe, a liquid inlet is formed in the upper connector so as to form a well flushing channel, a floatation ball is arranged in the upper connector, a support spring is arranged below the upper connector so as to support the upper connector, a self-sealing rubber sleeve is fixed on a cylinder body through heat treatment, a cone is connected with an inner pipe in threading mode, the upper end of the inner pie is connected with the upper connector in threading mode, the lower end of the inner pipe is connected with a lower connector in threading mode, a clamp tile sleeves a clamp tile cover, the clamp tile and the clamp tile cover are supported through a clamp tile spr