威海地区3000m深部地热钻探关键技术的应用与分析

Key technology for 3000m-deep small diameter geothermal drilling in the Weihai area of Shandong province

摘要:

“山东省文登-荣成-威海地区深部地热资源调查”项目是“山东省2018年度38个省直地质勘查项目”之一，总体目标是通过小口径深部钻探技术来完成3000 m测温孔的施工，为地热地质调查、钻孔测温、岩心热物性及放射性元素含量测试等工作提供通道和具体实物资料。本文结合3000 m小口径地热探孔的施工进程，系统介绍了该深孔的钻孔结构、施工设备、钻探工艺方法及关键技术等内容，重点针对严重破碎带、高应力复杂地层条件的泥浆技术、深孔钻头技术等展开了试验对比和分析研究，采取针对性技术措施，成功地解决了孔内复杂难题，配套研究的长寿命高效钻头提高了钻孔施工效率，减少了钻探成本投入。论文还探讨了深孔地热钻探的“现场标准化建设和绿色施工”管理方法。

Abstract:

The project“The Deep Geothermal Resources Survey in Wendeng Rongcheng Weihai Area of Shandong Province” is one of the 38 provincial-level geological exploration projects of Shandong Province for 2018， and its overall goal is to provide channels and specific physical data for geothermal geological survey， borehole temperature measurement， core thermophysical properties and radioactive element content testing by drilling a 3000 m temperature measurement borehole with wireline core drilling technology. In reference to the 3000 m-deep small diameter geothermal drilling project， this paper systematically introduces the drilling structure， Drilling equipment， and key drilling technology. with focus on the experimental comparison and analysis of mud technology and deep hole drill bit technology for severe fractured zones， and high stress and complex formation conditions. The relevant technical measures were adopted to solve the down hole complex problems and the long service life and high efficient bits were developed to improve the drilling efficiency and reduce the cost. The paper also discusses the management method of "site standardization and green construction" for deep hole geothermal drilling.