Oil casing pipe leakage detection system, method and device

The invention relates to the field of oil and gas field exploration, in particular to an oil casing leakage detection system, method and device. The ultrasonic detection device comprises a piezoelectric ultrasonic sensor used for receiving leakage ultrasonic signals transmitted through high-pressure gas in the oil casing; the electromagnetic ultrasonic sensor is used for receiving a leakage ultrasonic signal transmitted through annular liquid in the oil casing; the piezoelectric ultrasonic sensors and the electromagnetic ultrasonic sensors are uniformly arranged in a staggered manner and are distributed along the circumferential direction of the ultrasonic detection device; and the upper computer is used for receiving and analyzing the leakage ultrasonic signal sent by the ultrasonic detection device and judging a leakage source. The principle and characteristics of the two ultrasonic sensors are utilized to respectively capture the leakage ultrasonic signals of the oil pipe and the production casing, so that