干热岩水平井组热储改造技术现状与发展建议

Up-to-Date Technologies of Reservoir Stimulation for Horizontal Well Groups in Hot Dry Rock and Suggestions for Further Improvements

  • 摘要: 干热岩资源储量丰富、开发潜力巨大,但整体存在开发难度大、商业化应用程度低等突出问题。针对这些问题,系统调研了国内外增强型地热系统(EGS)工程实践,运用系统梳理、横向对比与数值模拟方法,构建了涵盖井网部署、完井改造与换热监测的地质−工程一体化评价体系,为EGS商业化开发提供数据支撑。研究结果表明,国外已形成以“水平井注采井组、井工厂平台钻井、拉链式体积压裂、全周期多源监测”为核心的成熟技术体系;国内现有示范项目以直井改造为主,存在井间连通性差、导流能力不足、热储改造效果不稳定等问题,尚未实现商业化突破。基于上述对比,提出适用于国内深层干热岩地质条件的系统性高效开发技术路线:以应力约束的井眼轨道优化为先导,匹配合理井距与精细化段簇设计,采用中高排量加砂体积压裂工艺,融合多源裂缝实时监测与闭环反馈调控机制,构建“设计—改造—评估—优化”一体化的水平井地热系统热储改造方法。该路线为国内干热岩资源高效开发及地热产业高质量发展提供了理论依据与实践路径。

     

    Abstract: Although hot dry rock resources are abundant and hold immense potential, their development faces challenges such as high development difficulties and low commercial viability. Therefore, Chinese and international engineering practices of enhanced geothermal systems (EGSs) were systematically reviewed. By applying systematic analysis, comparative evaluation, and numerical simulation, a geology-engineering integrated evaluation system covering well network deployment, well completion and stimulation, and heat exchange monitoring was established to provide data support for the commercial development of EGS. Research indicates that a mature technological system has been established internationally, which is centered on horizontal injector-producer well groups, well factory platform drilling, zipper-style volumetric fracturing, and full-cycle multi-source monitoring. In contrast, existing Chinese demonstration projects primarily rely on vertical well stimulation. These projects face critical constraints such as poor inter-well connectivity, insufficient flow capacity, and unstable reservoir stimulation effects and have not yet achieved commercial breakthroughs. Based on the above comparison, a systematic and efficient development technology roadmap suitable for the deep hot dry rock geological conditions in China was proposed. This roadmap is guided by stress-constrained well trajectory optimization, matches reasonable well spacing with refined stage and cluster design, adopts a medium-to-high displacement sand-adding volumetric fracturing process, and integrates a multi-source real-time fracture monitoring and closed-loop feedback control mechanism to establish an integrated “design-stimulation-evaluation-optimization” method for systematical reservoir stimulation of geothermal horizontal wells. This roadmap provides a theoretical foundation and a practical pathway for the efficient development of hot dry rock resources in China and the high-quality development of the geothermal industry.

     

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