Method for detecting damage of well casing

Abstract

The invention provides a method for detecting damage of a well casing. The method comprises the following steps: a, preparing a set of near-liquid-level ultra-deep sampling device; b, measuring the distance between the well water liquid level in the to-be-measured water well and the wellhead; c, cutting out a water inlet pipe with the corresponding length and preparing a lifting rope with the length greater than the total length of the well casing; d, fixedly connecting one end of the cut water inlet pipe to the lower port of the suction chamber of a jet device, fixedly connecting the other end to the connector of a flower net pipe pendant, connecting the exhaust hole of an air pump to the lower port of the nozzle in the suction chamber of the jet device through an air supply pipe, and tying one end of the lifting rope to the flower net pipe pendant; e, lowering the flower net pipe pendant, the water inlet pipe, the ejector, the water outlet pipe and the air supply pipe which are connected in sequence in the to-be-measured water well and also lowering the lifting roper; and f, starting the air pump, continuously pumping out the water body at the flower net pipe pendant in the well,lowering the flower net pipe pendant through the lifting rope, observing whether the color of the water body pumped out at the position corresponding to the flower net pipe pendant changes or not anddetermining the damaged depth position of the well casing.

Description

technical field [0001] The invention relates to a detection technology for well pipe damage, in particular to a detection method for well pipe damage. Background technique [0002] As the service life of the well goes on, the pipe wall of the well pipe will rupture, and the groundwater will carry sediment and seep into the well from the rupture, which will make the well water turbid, polluted, and affect the quality of the well water. As the water wells currently built are getting deeper and deeper, but the diameter of the well pipe is getting smaller and smaller, this brings great difficulty to the damage detection of the deep underwater well wall. For drinking water wells, failure to timely and accurately detect the damage of the well wall and repair it may lead to the scrapping of the entire water well, and its economic loss is very huge. [0003] At present, the damage detection method of water well mainly adopts electronic technology such as underground TV to judge. A...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a detection method for well pipe damage to solve the problem that the damage of narrow and long deep well pipes is difficult to detect

Images