Sliding sleeve rotating-stand column locking type well bottom safety valve

Abstract

The invention provides a sliding sleeve rotating-stand column locking type well bottom safety valve. The safety valve comprises a barrel provided with a guide pin; a sliding sleeve rotating mechanism, a middle baffle and a locking mechanism are sequentially arranged in the barrel from top to bottom; the sliding sleeve rotating mechanism and the middle baffle can slide up and down in the barrel; when the sliding sleeve rotating mechanism is pressed, the sliding sleeve rotating mechanism is attached to the middle baffle under the guidance of the guide pin, and closing of the well bottom safety valve is achieved; when the sliding sleeve rotating mechanism is pressed again, the sliding sleeve rotating mechanism is disconnected from the middle baffle under the guidance of the guide pin, and the well bottom safety valve is opened; and when the guide pin is cut off through external force, the middle baffle is pushed by the sliding sleeve rotating mechanism to trigger the locking mechanism, and permanent sealing of a shaft is achieved. The well bottom safety valve can realize a circulating opening-closing function; and under extreme working conditions, a polish rod is loosened, a sucker rod string freely falls, and the locking mechanism of the safety valve is triggered to quickly seal a well, so that safe and reliable sealing of the oil well is achieved.

Description

technical field [0001] The invention relates to the technical field of machinery, in particular to a sliding sleeve rotation-column locking type bottom well safety valve. Background technique [0002] The working environment of offshore oil wells is special. For extreme weather, it is necessary to shut down the wells and stop operations at sea, and the platform workers evacuate the offshore platforms; Therefore, in addition to ground valves, offshore oil wells must also be equipped with bottom hole safety valves. [0003] The downhole safety valve is a device installed in the oil and gas well, which can be closed in an emergency under special circumstances, so as to actively reduce the hazard and reduce the environmental impact. Due to the high safety level requirements of offshore oil wells, downhole safety valves have been extensively studied. Due to different uses and requirements, the switch structure is very different. There are various types of switches, which can b...

AI Technical Summary

Problems solved by technology

Lifting the tubing-type bottom hole safety valve requires large-scale supporting equipment to lift the tubing. The on-site operation is complicated and the operation cost is high. It is only suitable for overhaul operations.

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