Safety control system for pneumatic well heads

Abstract

The invention relates to a safety control device for natural gas well heads, namely a safety control system for pneumatic well heads. The safety control system comprises a control disc, a high-pressure guide valve, a low-pressure guide valve, a fusible plug and a pneumatic block valve. The high-pressure guide valve is communicated with the outlet of an inlet connector of the high-pressure guide valve on the control disc and then is in series connection with the low-pressure guide valve, the outlet of the high-pressure guide valve is connected with the inlet of the low-pressure guide valve, and the outlet of the low-pressure guide valve is connected with the inlet of an outlet connector of the low-pressure guide valve on the control disc. The high-pressure guide valve and the low-pressure guide valve are both installed on an air collecting pipe, and a guide pressure testing check valve I on the air collecting pipe is connected onto a super-decompression detection point on a site plant or a pipeline. The fusible plug is installed on a well head area, the pneumatic check valve is installed at the rear end of a flat valve of a well head gas production tree, and a solenoid valve and a valve position feedback device are both connected with an automatic control system with a remote terminal unit (RTU) or a programmable logic controller (PLC) control sheet. The safety control device for natural gas well heads improves safety and environmental protection property of the natural gas production well heads, achieves remote automation control and reduces using cost.

Description

technical field [0001] The invention relates to a natural gas wellhead safety control device, in particular to a pneumatic wellhead safety control system which improves the safety and environmental protection of the natural gas production wellhead, realizes remote automatic control and reduces the use cost. Background technique [0002] In 2005, the state promulgated GB50350-2005 "Oil and Gas Gathering and Transportation Design Regulations" requiring gas well wellheads to be equipped with wellhead high and low pressure emergency shut-off valves. API SPEC 6A "Wellhead Devices and Christmas Tree Equipment Specifications" and API RP 14C "Recommended Practices for Analysis, Design, Installation and Testing of Ground Safety Systems on Offshore Production Platforms" also made corresponding requirements for surface wellhead safety valves and control systems. Combining API SPEC 6A and API RP 14C, foreign countries have There are already complete and accurate requirements for the saf...

AI Technical Summary

Problems solved by technology

[0008] To sum up, the prior art high and low pressure emergency shut-off valves at the wellhead (that is, the high and low pressure emergency shutdown control system at the wellhead) have complex control logic, single function, low degree of automation, low control performance, and cannot solve the explosion-proof problem. It will cause a certain degree of pollution to the environment and cannot be used as a complete wellhead safety control system

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