Abstract: In hostile condition wells, such as high-temperature high-pressure(HTHP) ones and ultra-deep and highly deviated ones, etc., conventional logging methods no longer meet the requirements of safe and efficient oil and gas resource development due to technological and instrumental limitations. Therefore, new logging technologies such as pipe-conveyed memory logging system have been employed extensively. Based on the introduction of the constitution of the rigid HTHP pipe-conveyed memory logging system, its technological advantages were summarized. Furthermore, the typical application scenarios and results of this system in ultra-deep wells of Sichuan Basin and Tarim Basin were analyzed. The field applications show that the success rate of the pipe-conveyed memory logging system in the logging of ultra-deep wells is not less than 95% with the shortest operation time. It suggests that the system can effectively solve the logging problems under the conditions of tight hole, lost circulation, and complex wellbore trajectory. Compared with other logging methods, this logging system offers higher logging efficiency and greater operation success rate, therefore, it demonstrates great potential in the logging of complex ultra-deep wells, and its application can be scaled up broadly as well.