High-Temperature-High-Volume Lifting for Enhanced Geothermal Systems

Turnquist, Norman¹  Qi, Xuele¹  Raminosoa, Tsarafidy¹  Salas, Ken¹  Samudrala, Omprakash² 

[1] GE Global Research, Munchen (Germany);GE Global

关键词: Geothermal;    lifting;    high-temperature;    high-pressure;    ESP;   

DOI  :  10.2172/1259502
RP-ID  :  EE0002752
PID  :  OSTI ID: 1259502

学科分类：再生能源与代替技术

美国|英语

来源: SciTech Connect

【 摘 要 】

This report summarizes the progress made during the April 01, 2010 ??? December 30, 2013 period under Cooperative Agreement DE-EE0002752 for the U.S. Department of Energy entitled ???High-Temperature-High-Volume Lifting for Enhanced Geothermal Systems.??? The overall objective of this program is to advance the technology for well fluids lifting systems to meet the foreseeable pressure, temperature, and longevity needs of the Enhanced Geothermal Systems (EGS) industry for the coming ten years. In this program, lifting system requirements for EGS wells were established via consultation with industry experts and site visits. A number of artificial lift technologies were evaluated with regard to their applicability to EGS applications; it was determined that a system based on electric submersible pump (ESP) technology was best suited to EGS. Technical barriers were identified and a component-level technology development program was undertaken to address each barrier, with the most challenging being the development of a power-dense, small diameter motor that can operate reliably in a 300?��C environment for up to three years. Some of the targeted individual component technologies include permanent magnet motor construction, high-temperature insulation, dielectrics, bearings, seals, thrust washers, and pump impellers/diffusers. Advances were also made in thermal management of electric motors. In addition to the overall system design for a full-scale EGS application, a subscale prototype was designed and fabricated. Like the full-scale design, the subscale prototype features a novel ???flow-through-the-bore??? permanent magnet electric motor that combines the use of high temperature materials with an internal cooling scheme that limits peak internal temperatures to <330?��C. While the full-scale high-volume multi-stage pump is designed to lift up to 80 kg/s of process water, the subscale prototype is based on a production design that can pump 20 kg/s and has been modified for high-temperature operation. In parallel with the design and fabrication of the subscale prototype ESP system, a subscale test facility consisting of a high-temperature-high-pressure flow loop was designed, fabricated, and installed at GE Global Research in Niskayuna, NY. A test plan for the prototype system was also established. The original plan of testing the prototype hardware in the flow loop was delayed until a future date.