CO2爆破致裂工艺为建造商业化EGS储层提供了新方案,有望突破深层地热能行业发展的技术瓶颈,但目前未见CO2致裂技术用于干热岩系统的综合性能评价研究。基于此研究不足,借助数学建模定量科学评价其综合性能,解决此技术效果的不确定性和模糊性,填补深井地热系统综合评价体系的空白。考虑到深井CO2爆破干热岩系统是一个多变、模糊、复杂的非线性系统,该文选取AHP-FCE优化数学模型,AHP对深井爆破干热岩系统复杂问题分层,构建递阶层次结构,通过Matlab将专家的定性判断定量化,进而确定FCE中各层评价指标权重大小,再通过FCE模糊关系合成原理,对多因素影响下的深井CO2爆破致裂干热岩系统综合评分为83.36,预评价结果为较好,可考虑将CO2爆破致裂器用于干热岩开采。评定结果可作为深井CO2爆破致裂干热岩建设过程中的数据支撑,为地热开采工程提供一定的理论依据。
Abstract
The process of CO2 blasting-cracking provides a new scheme for the construction of commercial EGS reservoir,which is expected to make a breakthrough in the deep geothermal energy development. However, the comprehensive performance of the syetem for cracking hot dry rock by CO2 blasting technology in deep well （SCBH） has not been studied yet. Based on this research deficiency, its comprehensive performance was quantitatively and scientifically evaluated by mathematical modelling to solve the uncertainty and ambiguity of the effect of this technology and fill the gap in the comprehensive evaluation system of deep well geothermal system. Considering that the SCBH is a nonlinear system with variations,fuzzy and complex. In this paper,AHP-FCE optimization mathematical model was selected,AHP stratifies the complex problem of the SCBH and constructs a hierarchical structure. The qualitative judgment of experts was quantified through Matlab, and the weight of evaluation indexes of each layer in FCE was determined.Then based on the FCE fuzzy relation synthesis principle,the comprehensive score of the SCBH under the influence of multiple factors is 83.36. The pre-evaluation result is better. Therefore, CO2 blasting crackers may be considered for hot dry rock mining. The evaluation results can be used as data support for the technology of CO2 blasting-cracking to constructe the hot dry rock reservoir,and provide theoretical basis for geothermal mining projects.
关键词
地热能 /
CO2爆破 /
干热岩系统 /
数学模型 /
评价
Key words
geothermal energy /
CO2 blasting /
hot dry rock systems /
mathematical model /
evaluation
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基金
国家自然科学基金（41674180; 41602374）; 中国地质大学（武汉）实验技术研究项目（SJ-201811）
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