Remotely-controlled subsea isolation valve system

Abstract

A remotely-controlled subsea isolation valve system is mainly composed of three parts, wherein the first part includes subsea isolation valves, the second part includes an umbilical cable and fly wires, and the third part includes an upper platform hydraulic pressure unit (HPU). The upper platform HPU is connected with a subsea isolation valve actuator through the umbilical cable and the fly wires. Hydraulic pressure is supplied to the actuator through hydraulic power lines in the umbilical cable and the fly wires, and the actuator is operated to switch on or switch off the valves; meanwhile, switching signals of the valves are fed back to a platform center control system through the umbilical cable and electric cables in the fly wires; if a hydraulic system breaks down or has other requirements, the actuator can be operated mechanically by using an ROV torque tool, and then switching operation of the subsea isolation valves can be achieved. The remotely-controlled subsea isolation valve system is applied to a submarine pipeline system in China for the first time; through successful application of the system, the leakage accident risk of a platform is greatly reduced, and the safety and reliability of the platform are improved.

Description

technical field [0001] The invention belongs to the technical field of offshore oil and gas exploitation, and in particular relates to a remote-controllable underwater isolation valve system. Background technique [0002] In the natural gas subsea pipeline for exporting gas production platforms, the subsea pipeline may be damaged to varying degrees due to third-party damage or corrosion. Volume will also vary. In order to prevent damage to the submarine pipeline from affecting the safety of the platform and reduce environmental pollution, an emergency shutdown device is usually installed on the submarine pipeline. When the submarine pipeline is damaged, the gas source in the pipeline is cut off by closing the emergency shutdown device, reducing the loss of natural gas. Leakage, thereby reducing or avoiding various adverse effects. [0003] In the existing technology, an emergency shut-off valve is usually set at the entrance of the subsea pipeline of the upper part of the ...

AI Technical Summary

Problems solved by technology

[0003] In the existing technology, an emergency shut-off valve is usually set at the entrance of the subsea pipeline of the upper part of the platform. The disadvantage of this method is that since the emergency shut-off valve is set at the entrance of the subsea pipeline on the upper part of the platform, it can only control the natural gas entering the subsea pipeline.

However, if the riser or the submarine pipeline near the platform fails, a large amount of natural gas accumulated in the pipeline will be released and mixed with air, which may cause a sustained or catastrophic explosion, which will damage the safety of the platform structure and even endanger the lives of the workers on the platform. serious threat to security

Images