随钻超声井眼成像技术在地热勘探中的应用

Application of ultrasonic imaging logging while drilling technology in geothermal exploration

摘要:

针对地热勘探中井壁涌水层特征解析存在较大不确定性，本文基于常规综合测井的局限性，重点阐述了随钻超声成像测井的工作原理及技术优势。对随钻超声成像测井技术在MD?01地热井应用情况的分析表明，该技术可直观识别出井壁涌水层的地层结构特征，可对裸眼井壁裂缝、局部孔洞及复杂破碎带等特征进行表征。同种井壁特征下常规综合测井与随钻超声成像测井的结果基本一致，说明了随钻超声成像测井技术的可行性和准确性。该测井技术可有效改善常规综合测井的局限性，大幅缩短测井作业周期，显著提升测井效率，降低测井作业成本，在深部地热水平井测井中具有推广应用价值。

Abstract:

In view of the large uncertainty in the analysis of the characteristics of borehole water gushing layer in geothermal exploration， based on the limitations of conventional comprehensive logging， this paper focuses on the working principle and technical advantages of ultrasonic imaging logging while drilling. The analysis of its application in MD-01 geothermal well shows that the technology can directly identify the formation structure characteristics of the water gushing layer in the borehole wall， and can externally characterize the characteristics of open hole wall fractures， local holes and complex fracture zones. The feasibility and accuracy of the ultrasonic imaging logging while drilling technology can be verified as the basically same results with the conventional comprehensive logging under the same borehole wall characteristics. This logging technology can effectively improve the limitations of the conventional comprehensive logging， greatly shorten logging operation cycle， significantly improve logging efficiency and cutting the logging operation cost， which has popularization and application value in deep geothermal horizontal well logging.