World’s first radar experiment in a 7500m deep well

This paper presents the world’s first radar detection experiment conducted in a 7,500-meter ultra-deep well. By applying ground-penetrating radar technology to petroleum logging, the developed borehole radar system successfully achieved stratigraphic information detection in the 7,200–7,500 meter section of Shunbei Well No.2. Utilizing electromagnetic wave reflection principles, the system acquires echo signals carrying medium characteristics through transmit-receive antenna arrays, coupled with field-programmable gate array (FPGA) based high-speed acquisition for real-time downhole data transmission. Experimental results demonstrate high consistency (correlation coefficient: 0.92) between radar data and Sinopec’s geological drilling data, particularly in key stratigraphic features such as casing reflections at 7,250-meter depth. This breakthrough validates the operational stability and detection accuracy of borehole radar in complex subsurface environments, providing an innovative technological approach for ultra-deep hydrocarbon exploration.