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Subsea All Electrical Control System The all-electric control system is an all-electric–based system without the conventional hydraulic control of subsea components. The elimination of hydraulics means that any control system commands are sent in rapid succession without the usual retardation time required for accumulators to charge. This system is typically used in complex fields and marginal fields of long distances (usually greater than 5 km) and for high-pressure and high-temperature wells. The principle of an all-electric control system is shown in Figure below. For the subsea Xmas tree, the gate valves and the insert-retrievable choke are fitted with electric actuators. The tree contains dual, all-electric subsea control modules (SCM), which supply power and signal to individual actuators. The SCMs are normally subsea-retrievable. The main feature of this system is that the operation of the electric motors in valve actuators is performed by locally stored power from rechargeable Li-Ion batteries. The total power consumption of the system is quite low since only electronic supply power and the battery charging power is transferred from topside to subsea. The benefits of using all-electric control systems are very clear. An all electric control system is simpler compared to a conventional electrohydraulic control system. It is favorable to use when developing marginal fields at long distances from a processing facility because of the lower cost of umbilicals, and it also provides solutions to the problems associated with high-pressure and high-temperature wells because there is no need for hydraulic fluid. In addition, it provides a higher degree of flexibility when expanding an existing system and when introducing new equipment into the system. Finally, the removal of the hydraulic system erases environmental and economic problems related to the leakage of hydraulic control fluids and the complexity of working with hydraulics. #subsea #offshore #oilandgas

All Electric subsea Xmas Tree In the electric tree, the valves are actuated by DC motors rather than the normal hydraulic system. The first all- electrical tree was offered by Cameron. This tree is called CameronDC CameronDC represents a breakthrough solution to the risks of subsea production, and addresses the challenges that can result in downtime, costly intervention, deferred production and lost revenue for offshore operators. This all-electric system, powered by direct current,improves reliability,availability and maintainability. The system has no batteries, hydraulics or accumulators and much of the conventional electro-hydraulic equipment has been simplified or eliminated. The CameronDC design translates to greater uptime performance and significant cost savings. ? CameronDC is a unique all-electric system powered by direct current . it is claimed: ? * It increases reliability, availability and maintainability. ?* CameronDC is simpler. ?* Environmentally friendly. * Easier to install. * Fewer parts to maintain. * Better feedback and greater response time. ? Main Advantages and features are as follow: 1- Improved System Availability and Reliability : CameronDC provides 99% or better uptime availability in deepwater and at long stepout distances . 2- OPEX/CAPEX Savings: Operational savings are derived from fluids, reliability improvements, lower intervention costs and increased total production. Capital expenditure savings include umbilicals,hydraulic fluids, and installation and commissioning. ? 3- Deepwater and Long-distance Stepouts: CameronDC delivers capability at virtually limitless water depths and long-distance stepouts (beyond 100 miles) coupled with great response times. ? 4- Actuation Speed and Accuracy: With the elimination of hydraulics for power and signal,control system commands can be sent in rapid succession thus avoiding the lag time needed for accumulator charging. Flow and control of the well are maintained with precision . ? 5- High-speed Communication and Real-time Condition Monitoring: Without the need to transmit hydraulic signals through the umbilical, communication with equipment is near instantaneous and feedback on subsea conditions is instantaneous. ? 6- Environmentally Friendly: Without dependence on conventional hydraulics, the system offers significant health, safety and environmental advantages. The potential for hydraulic leaks is eliminated, as is the issue of fluids disposal. #subsea #subseaengineering #offshore #oilandgas

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