Sliding sleeve type subsurface safety valve

Abstract

The invention relates to a sliding sleeve type subsurface safety valve. The sliding sleeve type subsurface safety valve comprises a lower joint (1), an upper joint (2), a housing (3), a power device (5) and a sliding sleeve (6), wherein an oil gas passage (4) is arranged inside the lower joint (1); a thin shaft part at the upper part of the lower joint (1) is matched and connected with the upper joint (2) through threads; a thick shaft part at the lower part of the lower joint (1) and the upper joint (2) are respectively matched with the housing (3); an annular inserting groove (11) is formed in the inner part of the lower joint (1) in the axial direction; the power device (5) is mounted in a closed cavity formed by the lower joint (1), the upper joint (2) and the housing (3); the sliding sleeve (6) comprises a connecting part (6) and an isolating part (10); the connecting part (9) is connected with the output end of the power device (5); the isolating part (10) is matched with the annular inserting groove (11) in an inserting connection mode. The sliding sleeve type subsurface safety valve has the advantages of rapid and sensitive reaction, complete isolation and reusing.

Description

technical field [0001] The invention relates to the field of petroleum drilling, in particular to a sliding sleeve type downhole safety valve. Background technique [0002] Downhole Safety Valve (SSSV) (SubSurface Safety Valve) is a valve installed in oil and gas wells, when oil and gas extraction equipment fails (such as fire, pipeline rupture, etc.) or irresistible natural disasters (such as earthquakes, ice conditions, strong typhoons, etc.) ) Under abnormal conditions, it can be shut down in an emergency to prevent blowout, ensure oil and gas well measures, and produce safe downhole tools. [0003] There are two kinds of downhole safety valves at home and abroad according to their purposes: one is a control valve for water injection of water injection wells or production of oil production wells; the other is a safety valve used in combination with packers to prevent blowouts. Among them, the ground control oil pipe recovery type is the most representative. It is directl...

AI Technical Summary

Problems solved by technology

[0004] For example, Chinese patent 200910312467.9 discloses a poppet valve-type underground and internal blowout preventer, which can realize simultaneous sealing of the inside and outside of the drill pipe, and uses pulse mode to send control signals, but has the following disadvantages: 1. In case of emergency, the rubber After the body expands, it cannot be locked, that is, the well cannot be shut in effectively or cannot withstand high shut-in pressure; 2. The reliability of the signal transmission method is not good

[0005] As another example, Chinese patent 200910312469.8 discloses a ball valve-type downhole blowout preventer integrated inside and outside. The ball valve is driven to rotate through the worm gear and worm drive, and the internal passage of the stage is drilled to realize the blowout prevention inside the drill pipe. However, when the blowout pressure is too high, the opening force of the ball valve Far greater than the ball valve opening force under normal conditions

Therefore, it is prone to the phenomenon that the channel is not closed in time, or even cannot be closed, so that the blowout cannot be contained

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