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Figure 3. Schematic drawing of the surface plant at Fenton Hill. The injection pump circulates water from the injection well, through the HDR reservoir, out of the production well and around the surface loop. The plant is highly automated an instrumented at numerous points (not shown). The heart of the surface plant is the injection pump which supplies the motive force for moving the fluid through the circulation loop. Originally, two diesel-powered reciprocating injection pumps were installed in the surface plant. These were designed for use on an alternating schedule, with one pump in operation and the other in reserve at any point in time. The pumps could be adjusted for operation over a wide range of pressures and flow rates. Each was capable of injecting a maximum volume of about 11 l/s of water at pressures as high as 34.5 MPa. For reasons unrelated to HDR technology, both these pumps failed within a span of two days during a period of normal operations. Several months of intermittent operations passed before a rented centrifugal pump powered by electricity was installed in the system. While lacking operational flexibility, the electric pump was extremely simple and very reliable. This original centrifugal pump was returned to its owner in late May 1993. A pump of similar design but with a somewhat higher flow capacity was subsequently purchased and installed permanently at Fenton Hill when the decision was made to resume flow testing in 1995. The injection pump, piping to the injection wellhead, both wellheads, the wellbores and all flow paths through the reservoir constitute the high pressure portion of the circulation loop. This part of the system has been built for operation at applied surface pressures of up to 34.5 MPa. The remainder of the loop, the low pressure side, includes a particle/gas separator, an air-cooled heat exchanger, a makeup water pump, and connecting piping. This part of the system is capable of operation at up to 6.9 MPa. It feeds directly back to the injection pump. The surface plant is 6PDF Image | Hot Dry Rock Geothermal Energy Development in the USA
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