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Pub. No.:    WO/2018/126386    International Application No.:    PCT/CN2017/070245
Publication Date: Fri Jul 13 01:59:59 CEST 2018 International Filing Date: Fri Jan 06 00:59:59 CET 2017
IPC: E21F 17/18
G08C 17/02
H01Q 1/38
Applicants: ZHOU, Dan
Inventors: ZHOU, Dan
A downhole detector, comprising: a waterproof housing (1), a top portion of the waterproof housing (1) being provided with a lifting ring, while the waterproof housing (1) is provided therein with a circuit cavity (3) and a battery cavity (4); the battery cavity (4) is provided therein with a power supply battery, which is used for supplying power to a detector, and the circuit cavity is provided therein with a monitoring circuit; the monitoring circuit comprises a main control chip and a communication device, which is in signal connection with the main control chip, the communication device comprising a communication chip and an antenna; an oxygen concentration detector (5) is provided on the waterproof housing (1), the oxygen concentration detector (5) being in signal connection with the main control chip; by means of a simple structural design, when a downhole situation requires detection, the detector is lowered into a downhole by using only a rope and may carry out detection.