Downhole cable shearing device with energy storage power

Abstract

A downhole cable shearing device with energy storage power comprises an upper connector, an impact rod, a conversion seat, a transmission sleeve, a slip seat, a split slip, a mandrel rod, a cutter seat, a lower connector, a cutter blade, a disc spring set, a slip spring, a slip cylinder and a disc spring cylinder, the contact face between the impact rod and the conversion seat is a spiral inclined face, and the upper end of the transmission sleeve is connected to the lower end of the conversion seat, a vertical notch and an L-shaped groove hole are formed in the side wall, a slip bowl, a split slip and a slip spring are contained in the slip bowl, the upper end of the mandrel rod is connected to the lower end of the transmission sleeve, the disc spring set is arranged on the mandrel rod in a sleeved mode, the cutter seat is arranged in a diameter expanding containing cavity formed in the lower connector, and the cutter blade is hinged to the cutter seat and initially limited by an elastic structural part. According to the device, instantaneous release of shearing energy is preset through the disc spring set, the cable is cut off through high-impact-strength shearing force, release of clamping energy is preset through the slip spring before shearing, the cable is fixed, shearing is assisted, and the reliability and working efficiency of underground cable shearing construction can be improved.

Description

technical field [0001] The invention relates to an underground cable shearing device, in particular to an underground cable shearing device with energy storage power. Background technique [0002] In the logging or testing process of oilfield production wells, when the downhole instrument is blocked and stuck, in order to avoid the adverse effect of the downhole cable on the downhole instrument salvage, in some cases, it is necessary to use the cable shearing device at the stuck point of the downhole instrument Cut the cable and hoist it to the wellhead. The logging cable shearing device currently used in production relies on drill pipe, tubing, coiled tubing and other auxiliary string operations, or pulls the cable through the wellhead, pulls the shear knife in the shearer to flip over to complete the shearing action, or passes through the wellhead Press down the pipe string to force the top of the falling fish to apply force to the pup joint to complete the shearing actio...

AI Technical Summary

Problems solved by technology

However, this method of shearing based on pulling the cable at the wellhead or pushing down the pipe string, when the logging instrument is completely buried, the weak point of the horse bridle cannot play a protective role, and at the same time there is no derrick to provide drilling tools, and The storage logging tools used downhole and the failure of explosive cutting lead to adhesion between the cable and the drill pipe, because the drill string can no longer be lowered into the water hole of the drilling tool for auxiliary cutting, it cannot be practically used. Moreover, these logging cables The shearing device adopts a static shearing structure without impact momentum. Not only is the shearing efficiency low, but the lifting load is too high. Affected by the cable's own weight, it may sometimes exceed the load of the cable and cause the wellhead of the cable to break. When there are local defects, there may be fractures in unexpected parts, causing the cable to fall into the well and form residues, resulting in cable shearing accidents, which will bring very adverse effects on oil field production and unnecessary economic losses

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