YR1地热井断层性漏失封堵技术

Fault type circulation loss plugging technology for YR1 geothermal well

摘要:

YR1井是山东省郓城地热田地热资源开发利用示范项目布署的一口地热开采井，设计井深1700 m。针对YR1地热井断层性漏失量大、断层水水头高度大、上部有裸孔井段等井下复杂情况，在分析漏失性质和井眼环境的基础上，考虑现有恶性漏失堵漏技术的适用条件和局限性，采取下套管封隔断层的施工方案，成功解决了断层性漏失堵漏难题。同时采用了分级固井技术，解决断层水上窜下渗的隐患，保证了成井质量。工程实践表明，下套管封隔断层堵漏措施耗时短、成本低、效果好。该地热井最终井口出水温度54.5 ℃，出水量达402 m3/h（降深10.35 m），创下了山东省地矿局地热井出水量新纪录，能够满足当地社区10000余人、20余万m²建筑的清洁供暖需求。

Abstract:

In view of the complex downhole conditions of YR1 geothermal well， such as large amount of fault type circulation loss， high water head of the fault water， an openhole interval in the upper part， and taking into account of the application conditions and limitations of the existing plugging technology for malignant circulation loss， it was decided to adopt casing to seal off the fault with analysis of the nature of circulation loss and the borehole environment. The method successfully solved the fault type circulation loss plugging difficulty. In addition， the staged cementing process was adopted to prevent upward channeling and downward seepage of the fault water to ensure the quality of well completion， providing a good reference for dealing with fault or cave type circulation loss in the future. Field practice shows that the casing plugging measure introduced in this paper has the advantages of short operation time， low cost and good effect. The method has facilitated the development and utilization of geothermal resources， and helped to build the “Yuncheng Model”. It has contributed to the local economic and social development and is of great significance to help to campaign against pollution.