Electricity generation and heating potential from enhanced geothermal system in Songliao Basin, China: Different reservoir stimulation strategies for tight rock and naturally fractured formations. (15th December 2015)

• Record Type: Journal Article
• Authors: Zhang, Yan-Jun; Guo, Liang-Liang; Li, Zheng-Wei; Yu, Zi-Wang; Xu, Tian-Fu; Lan, Cheng-Yu
• Is Part Of: Energy. Volume 93:Part 2(2015)
• Page Start: 1860
• Page End: 1885
• Publication Date: 2015-12-15
• Subjects: Enhanced geothermal system -- Hot dry rock -- Hydraulic fracturing -- Electricity generation -- Heating potential -- Optimal strategy; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Energy consumption -- Periodicals; 333.7905
• DOI: 10.1016/j.energy.2015.10.059
• Languages: English
• ISSNs: 0360-5442

Abstract

Abstract: Daqing City in Northern Songliao Basin (China) requires huge amounts of electric power and thermal energy for oil processing and resident support each year. We used actual geological and logging data of deep well YS-2 in Daqing oilfield to investigate electricity generation and heating potential from enhanced geothermal systems in tight rock and naturally fractured formations (3850–4500 m) using different reservoir stimulation methods. We then proposed optimized hydraulic fracturing and heat extraction strategies for each formation. Results indicate that the Yingcheng formation is suitable for the development of HDR (hot dry rock) resources in this region. Heat output in the stimulated naturally fractured formation is obviously higher than that in the tight rock formation. The development of HDR resources in the naturally fractured formation should be prioritized. In middle-low temperature (about 160 °C), tight rock formation still has great potential for heating supply, but the structure has poor capacity for electricity generation because of the low appropriate injection rate resulting from low reservoir temperature. However, when a high temperature reservoir is selected, electricity generation is feasible from tight formation by using gel-proppant hydraulic fracturing combined with horizontal well technology. Highlights: Enhanced geothermal systems under various formation conditions are investigated. Reservoir geology, stimulation and hydro-simulation approaches are integrated. Optimized hydraulic fracturing and heat extraction strategies are proposed. EGS reservoir should be prioritized in the naturally fractured formation.