Application of ultrasonic imaging logging while drilling technology in geothermal exploration

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.