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- Title
深部超临界地热资源研究进展及开发前景展望.
- Authors
许天福; 汪 禹; 封官宏
- Abstract
Compared with traditional geothermal resources, supercritical geothermal resources have greater development potential. At present, however, the research on supercritical geothermal resources is in the preliminary exploration stage, and the theoretical research and technical exploration face many challenges. In order to reach the goal of energy saving and emission reduction and make contribution to energy structural adjustment in China, this paper systematically reviews the drilling engineering and testing engineering of supercritical geothermal resources all over the world and summarizes the experience and lessons in terms of well drilling and completion technologies. Then, the challenges to the development of supercritical geothermal resources, the potential solutions, the future research direction and the key points of technical development were pointed out based on the international research achievements and latest situations in terms of laboratory experiment, field test and numerical simulation of supercritical geothermal resources. And the following research results were obtained. First, from the aspect of theoretical research, it is necessary to figure out the multiphase flow behaviors of subcritical-supercritical fluids, the chemical characteristics and water-rock reaction mechanisms of supercritical water, the elastic-plastic deformation of rock mass mechanics under high-temperature conditions and other important issues. Second, its engineering practice faces severe challenges, such as the application of drilling and logging techniques under the conditions of ultra-high temperature and acid fluid and the program development of multi-field coupling simulation under supercritical conditions. Third, it is necessary to carry out theoretical research on the supercritical state equation of multiple compositions (e.g. water, brine and acid gas) and develop the corresponding state equation module. Fourth, as for field demonstration engineering, it is necessary to strengthen the studies on geothermal resource evaluation and exploration methods, high-temperature drilling and logging techniques, reservoir construction techniques and surface systems. Fifth, it is necessary to develop and improve high and ultra-high temperature drilling and completion techniques and develop environmental and degradable drilling fluids. In conclusion, with the scientific and technological progress, the commercial development of supercritical geothermal resources may be realized in the near future.
- Subjects
CHINA; SUPERCRITICAL water; DRILLING fluids; GEOTHERMAL resources; MULTIPHASE flow; DRILLING muds; GEOTHERMAL engineering; ROCK deformation
- Publication
Natural Gas Industry, 2021, Vol 41, Issue 3, p155
- ISSN
1000-0976
- Publication type
Article
- DOI
10.3787/j.issn.1000-0976.2021.03.019