Injection Well Control
What are Injection Wells?
Within the last few decades, injection wells have become a necessity for maximum geothermal power generation and reservoir management. Fluid injection is one of the most important parts of this process, eliminating any environmental impact of surface disposal and providing pressure support to the well. To ensure reservoir replenishment and the highest production well output, injection sites need to meet specific requirements to be selected. These include exploration, testing, conceptual modeling and proper well design.
Why is Accurate Control so Essential?
Reliable flow control keeps fluid velocities high enough to prevent the settling of suspended solids. It also allows multiple units to feed a reduced number of injection wells. Controlling fluid flow to an injection well while maintaining system backpressure, however, is a difficult task in itself. Potential major issues, such as gradual plugging of the well or pipeline due to silica scaling, increase injection pressure. Cooling of the fluid at production wells or declining enthalpy happens if there is “short-circuiting” of the injected fluid through a fault or fracture zone during high pressure conditions.
The wrong type of actuation technology could spell disaster for a geothermal plant.
The REXA Solution
With more than 20 years of experience in the Geothermal power market, REXA Electraulic™ Actuators ensure efficient injection well control. The self-contained, closed-loop hydraulic circuit provides stiff and stable control independent of load variation. Unscheduled downtime due to overheated actuators tripped offline from high ambient temperatures and scaled-up valves becomes a thing of the past!
Literature
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