Long-distance double-layer pipe inner pipe leakage point positioning method

The invention belongs to the technical field of long-distance pipeline leakage detection, and particularly relates to a long-distance double-layer pipe inner pipe leakage point positioning method. Themethod comprises the steps that equipment used for positioning long-distance double-layer pipe inner pipe leakage points is arranged and installed; whether the inner pipe leaks or not is preliminarily checked, and the number of leakage points is determined; an upstream reference leakage point and a downstream reference leakage point are set, and the distance between the upstream reference leakagepoint and a suction gun, the distance between the downstream reference leakage point and the suction gun and the diameter of the inner pipe are determined; a to-be-detected leakage point on the innerpipe is identified; and the distance between the to-be-detected point and the suction gun is calculated, and the position of the to-be-detected point is determined. According to the method, monitoring operation is carried out