Unjamming device and method for downhole instrument string

Abstract

The invention relates to a sticking releasing device and method for a downhole instrument string. An outer pipe comprises an upper connector, a connecting body, an upper barrel, a lower barrel and a lower connector in sequence in a rotary connection mode. A driving device, an unlocking device and a jarring device are installed in an inner cavity of the outer pipe from top to bottom. A driving motor is connected with a lead screw, and a transmission nut of the lead screw is connected with a slip mandrel. The middle of the slip mandrel is sleeved with a locking sleeve, a chuck at the lower end of the slip mandrel is inserted into elastic slip teeth of a slip, and an unlocking inclined surface is arranged at the upper end of the locking sleeve. The upper end of a jarring rod is in rotary connection with the lower end of the slip, the periphery of the jarring rod is sleeved with an energy storage spring, the lower end of the energy storage spring is supported on the outer step of the jarring rod, and the upper end of the energy storage spring is supported on the inner step of the lower barrel; an anvil is located below the jarring rod, and the outer step of the anvil is supported on the upper end face of the lower connector. The driving motor pulls the jarring rod to move upwards through the lead screw and the transmission nut to compress the energy storage spring, the energy storage spring is released to push the jarring rod to impact the anvil, and the stuck instrument spring is released.

Description

technical field [0001] The invention relates to a jamming device for downhole instrument strings, and also relates to a jamming method for downhole instrument strings, belonging to the technical field of downhole instrument jamming. Background technique [0002] With the needs of oilfield exploration and development and the development of drilling technology, such as some ultra-deep wells, long open hole completions, slim hole wells, highly deviated wells, S-shaped wells and some unconventional wells are also used more and more. Logging operations are necessary during the drilling process, but the downhole conditions of unconventional wells are more complex than those of conventional wells, which often leads to the occurrence of obstruction and jamming of logging tools in the open hole section during logging operations. Once the instrument string is stuck in the well, the logging operation can only be stopped, and the salvage operation has to be done to release the stuck log...

AI Technical Summary

Problems solved by technology

There are the following deficiencies: first, it is used only when it needs to be released; second, it is difficult to reach the stuck point in unconventional wells;

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