Underwater electrical distribution system for chained wellhead distribution

Abstract

The invention discloses an underwater power distribution system for chained wellhead distribution. The system comprises an overwater power unit, which is sequentially communicated with multiple stagesof upstream and downstream underwater power distribution modules, wherein the underwater power distribution modules are electrically communicated through umbilical cables, each underwater power distribution module comprises a main control loop and a standby loop, the main control loop distributes and transmits communication and power signals, when the main control loop is in a normal state, the standby loop only plays a role of a cold standby loop, and when a certain position of the main control loop breaks down, the standby loop and the main control loop in the downstream underwater power distribution module connected with the position where the fault occurs are disconnected, and the main control loop in the downstream underwater electric distribution module is in jumper connection and is communicated with the standby loop through a first electric fly wire, so that the standby loop at the fault position is communicated with the main control loop in the downstream underwater electricdistribution module, and when the upstream fault position is maintained, each stage of downstream underwater electric distribution module is not affected, and production halt is not required.

Description

technical field [0001] The invention relates to an underwater power distribution system in the field of offshore oil engineering, in particular to an underwater power distribution system for chain wellhead distribution. Background technique [0002] The underwater control system is one of the key systems to ensure the safe and efficient operation of deep-sea production facilities. The subsea control system includes a master control station (MCS), a subsea hydraulic power unit (HPU), a subsea power unit (EPU), a subsea distribution unit (SDU), a subsea control module (SCM), and subsea instruments. The subsea distribution unit (SDU) usually consists of electric and hydraulic distribution modules. It is the key equipment of the underwater control system. into multiple subsea production facilities (Christmas trees, manifolds, etc.). [0003] Since the power and communication of the underwater control system are the blood and nerves of the entire underwater control system, the ...

AI Technical Summary

Problems solved by technology

Therefore, the power and communication lines of the central platform or FPSO need to go through 2 to 3 times of power distribution to reach the wellheads at each end. When the upstream power distribution unit or umbilical cable fails to be repaired, it is necessary to cut off the power supply and communication of the downstream oil and gas wells, which will cause Reduce the system availability of the entire oilfield group, affecting oil and gas production

[0005] At the same time, during the maintenance of the underwater control system, engineering ships and ROVs are required to plug and unplug the electrical connectors along the circuit downstream of the fault point. In the actual process, an area of ​​tens of kilometers is usually required for operation, resulting in high costs. Operating costs for offshore vessels and ROVs

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