Control valve used for preventing spraying of oil well

Abstract

The invention discloses a control valve used for preventing spraying of an oil well. The control valve comprises a bracket and a cover plate, wherein blind holes are formed in the side edges of the bracket, inclined surfaces A are arranged in the middles of adjusting rods, extension parts which are parallel to the side edges of the bracket are fixed at the two ends of the cover plate, the middlesof the extension parts are arc-shaped elastic connection parts, absorption grooves which are communicated with the blind holes are formed in the side walls of the bracket, inclined surfaces B which are matched with the inclined surfaces A are arranged at the movable ends of jacking rods, and the movable ends of the jacking rods penetrate through the absorption grooves and are placed into the blindholes. The inclined surfaces A are in contact fit with the inclined surfaces B, the jacking rods move outward, the jacking rods drive two connection rods to move forward continuously, the other endsof the two connection rods apply tension to the arc-shaped elastic connection parts while being hinged with the arc-shaped elastic connection parts, the arc-shaped elastic connection parts are deformed, that is arch shapes are changed into linear shapes, cables can have enough accommodation spaces, and the protection functions of the cable trays to the cables are ensured while simultaneous placingof a plurality of cables is guaranteed.

Description

technical field [0001] The invention relates to the field of oil exploitation, in particular to a control valve for preventing oil well injection. Background technique [0002] At present, in the actual workover process in the oil field, the tubing needs to be taken out first to repair the casing. However, when the tubing is hoisted by lowering the elevator, it is easy to bump the sealing steel ring groove of the tubing head cross, and damage the sealing steel ring groove. At the same time, due to the residual pressure downhole, natural gas or crude oil leakage often occurs, and even well kicks and blowouts occur. Serious hidden dangers of safety accidents are brought to workover production, which is always a difficult problem to solve in the process of oilfield workover operations. Therefore, designing a device that can not only safely protect the sealing steel ring groove, but also automatically control the sudden occurrence of well kick and blowout phenomenon, and at the...

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