Reverse buckling equipment

Abstract

The invention relates to a reversed clamper, which comprises: upper connector, eccentric axle, upper and lower anchor devices, inner gear, and rotation gear, bearing element, output axle and lower connector, wherein between the lower part of upper connector and the upper end of eccentric axle, between the upper and lower ends of inner gear, between upper and lower anchor devices, and between the lower end of output axle and the upper part of lower connector, there are torque rings whose circumferences contacted with the eccentric axle, upper and lower anchor devices and output axle have slope sliding channels; said slope sliding channels are reversed to the slope sliding channels of said elements; and their circumferences contacted with the lower part of upper connector, upper and lower ends of inner gear, and the upper part of lower connector have mesh end surface teeth. The invention can replace reversed clamp rod, to increase the torque after speed reduction, to reduce the cost and improve the efficiency.

Description

technical field [0001] The invention belongs to a matching device for major workover operations in oil fields, in particular to an undercut device. Background technique [0002] In the production operation of the oil field, the tubing and drill pipe are often stuck or the casing is damaged, which requires undercut fishing and positioning and casing replacement. When the oil pipe, drill pipe or casing transmits torque to the upper and lower parts, it depends entirely on the connecting thread between the two. When the best make-up state is reached or exceeds the make-up state, the thread will be squeezed and lost, resulting in screw thread Slip. At present, the U.S. Hughes company manufactures the reverse buckle under the condition of no load equalizing mechanism, which is statically indeterminate, even if the torque is very small, there is no reliability. In 1984, my country's Shengli Oilfield was tested but failed. There are also domestic research and development of spiral...

AI Technical Summary

Problems solved by technology

There are also domestic research and development of spiral and hydraulic undercut devices. Due to the elastic torque deformation of the drill pipe, the undercut is invalid, forcing various oil fields to use a large number of undercut drill pipes. However, due to the undercut drill pipe, the downhole cannot be slowed down. In horizontal wells, the friction between the drill pipe and the well wall results in a large loss of shaft power, and the torque cannot meet the requirements for unblocking and back-off, which limits the operating range

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