Combined valve device for intelligent flow control and cut-off of natural gas well

Abstract

The invention provides a combined valve device for intelligent flow control and cut-off of a natural gas well. The intelligent flow control and cut-off functions are achieved through a valve body, a shell assembly, a center rod extending into the valve body, an electric appliance driving unit fixedly arranged on the outer side of the valve body and a gas control device arranged in the shell assembly; the electric appliance driving unit drives a copper nut to enable a lead screw to drive the center rod to move up and down and drive a conical plug at the bottom end of the center rod to move up and down, the gap between the conical plug and a seat ring is controlled, and intelligent flow control is achieved; the gas control device is connected with a driving end of an overpressure air cylinder and drives a piston to move up and down in a sealing cavity along the center rod, a seat seal valve is driven to be arranged on the seat ring in a closed mode, and sliding cut-off is achieved; and under the condition of sudden major leakage of a natural gas pipeline network, mechanical protection can be carried out even under the condition of power failure, and the flow control function can be independently achieved.

Description

technical field [0001] The invention relates to the technical field of mechanical manufacturing of special equipment for oil and natural gas well exploitation, in particular to a combined valve device for intelligent flow control and cutoff of natural gas wells. Background technique [0002] Conventional safety shut-off valves for oil and natural gas wells are installed at the position of production valves at the wellheads of natural gas production. They can remotely measure wellhead pressure and protect gas pipelines. They are important safety protection devices in the oil and gas industry. When the pressure of the gas pipeline is higher or lower than the set value, the device can automatically cut off the natural gas channel in time to prevent major accidents; when the fault is eliminated, the cut-off valve can be opened automatically through remote control to resume production . The disadvantage of conventional safety shut-off valves is that they cannot independently con...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem that conventional safety cut-off valves in the prior art cannot independently control the flow of oil and natural gas pipelines, the present invention provides a combined valve device for intelligent flow control and cut-off of natural gas wells. The device is simple in structure, easy to operate, and has The two functions of flow control and cut-off greatly reduce the investment in well site equipment, and have the effect of one valve with two functions

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