Underwater safety isolation device for submarine pipeline

Abstract

The invention discloses an underwater safety isolation device for a submarine pipeline. The underwater safety isolation device comprises a central control device, wherein the central control device is connected with a main control station, a control plate for an underwater safety isolation valve, an overwater umbilical cable terminal device, a control umbilical cable for the underwater safety isolation valve, a hydraulic performing mechanism and the underwater safety isolation valve in sequence; a hydraulic power unit is used for adjusting a hydraulic power source through the control plate; the main control station is used for exchanging data with the central control device, processing and transmitting an instruction to the control plate for the underwater safety isolation valve after receiving a switching on or off signal of the underwater safety isolation valve of the submarine pipeline, sent by the central control device, switching on or off a solenoid valve in the control plate, enabling the solenoid valve to conduct a hydraulic oil supply and return loop, and switching on or off the underwater safety isolation valve. According to the underwater safety isolation device, the submarine pipeline can be safely isolated before being connected to a fixed platform for marine oil or a floating type production facility, and the production facility is subjected to position state displaying and remote operation.

Description

technical field [0001] The invention relates to a submarine pipeline, in particular to an underwater safety isolation device for a submarine pipeline. It belongs to the field of offshore oil engineering. Background technique [0002] At present, in the South my country Sea, the overall development method of "underwater production system + fixed platform" is mostly adopted in large and medium-sized gas fields with a water depth of about 200 meters. That is: the production gas (liquid) produced by each gas field is transported back to the fixed central processing platform relatively close to the offshore through the submarine pipeline and the platform standpipe, and the production gas (liquid) is processed by the central processing platform before being transported back to land terminal. Due to the high temperature and pressure of the gas and liquid produced in the South China Sea gas field, it generally exceeds 5000psi and above 90°C. And for the central processing platfor...

AI Technical Summary

Problems solved by technology

However, since the platform standpipe and the subsea pipeline, which are the fluid delivery hubs produced by the underwater offshore oil platform, are not provided with relevant shut-off control devices, once a leak occurs, the isolation facility between the platform riser and the returned subsea pipeline will also be shut down. fail

Considering that once an accident occurs on the central processing platform, the platform riser and the submarine pipeline may be damaged. Since the submarine pipeline has no isolation barrier on the seabed, combustible hydrocarbon fluids will continue to flow from several kilometers, tens of kilometers or several kilometers longer. The 100-kilometer submarine pipeline continuously leaked to the central platform, further aggravating the consequences of the platform accident

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