The electric submersible pump (hereinafter referred to as ESP) is a kind of high efficiency, high yield, suitable for deep mechanical oil recovery equipment. According to the data, the average liquid production of electric submersible pump rod pump is more than 2 times. However, in the actual production, the frequent accidents fall into a well electric submersible pump. According to a field survey, electric submersible pump well falling rate as high as 10% to 15%. The electric submersible pump well falling accidents, on the one hand affect the efficiency of electric submersible pump, reducing crude oil production; on the other hand, the electric submersible pump is difficult to salvage after falling, bring a lot of trouble, but also caused major economic losses. According to a survey of falling accident analysis found that there are two direct reasons caused by ESP fall well: one is the connecting thread between the ESP section of the pump, the pump barrel and the pump head or between the electric submersible pump system and tubing (hereinafter referred to as the pipe thread connection), caused by the failure of the anti down block down buckle down wells. The second is to fall well connected between the bolt fracture caused by electric submersible pump or motor section of the pump section.
