An emergency fall arrester for preventing cables from falling into wells

Abstract

The invention relates to an emergency falling protector for preventing a cable from falling into a well, and belongs to the fields of petroleum and natural gas well logging and testing. According to the technical scheme, the falling protector consists of a right half part of the falling protector and a left half part of the falling protector, which are connected together through two connecting bolts; a right mushroom head, a right slip segment, a right base and a right conical centering guide are arranged in sequence from the upper end to the lower end of the right half part of the falling protector; a left mushroom head, a left slip segment, a left base and a left conical centering guide are arranged in sequence from the upper end to the lower end of the left half part of the falling protector; the center of the falling protector is provided with a cable hole; slips are arranged on the right slip segment and the left slip segment respectively; the slips are connected with the right slip segment and the left slip segment respectively through countersunk head screws; the middle part of the right slip part is provided with a fastening bolt. The emergency falling protector has the beneficial effects that the cable can be clipped to realize well shutdown, the complicated underground situation caused by falling of the cable into the well can be prevented, the risk of out-of-control blowout is lowered, and the construction safety is enhanced; the clipped cable can be salvaged easily, conveniently and rapidly, and the cost on salvage of the cable falling into the well is lowered.

Description

technical field [0001] The invention relates to a cable fall arrester used in the fields of oil and gas well logging and testing, in particular to an emergency fall arrester for preventing cables from falling into wells. Background technique [0002] In the oil and gas drilling and workover construction, it is necessary to run the cable from the wellhead for logging and testing. During the logging and testing of the cable, accidents such as blowout may occur. When the risk of blowout out of control occurs, it is necessary to immediately Cut the cable at the wellhead and close the well, and turn on the well control device to prevent blowout accidents; however, the cable is cut from the wellhead and then falls into the well, making the downhole situation more complicated, which brings difficulties to later salvage and other constructions, and damages the construction team. huge. Therefore, most construction teams dare not and are unwilling to cut the cable when encountering t...

AI Technical Summary

Problems solved by technology

[0002] In the oil and gas drilling and workover construction, it is necessary to run the cable from the wellhead for logging and testing. During the logging and testing of the cable, accidents such as blowout may occur. When the risk of blowout out of control occurs, it is necessary to immediately Cut the cable at the wellhead and close the well, and turn on the well control device to prevent blowout accidents; however, the cable is cut from the wellhead and then falls into the well, making the downhole situation more complicated, which brings difficulties to later salvage and other constructions, and damages the construction team. huge

Therefore, most construction teams dare not and are unwilling to cut the cable when encountering this situation, which increases the possibility of blowout out of control

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