RESEARCH ON A NOVEL LASER DETECTION METHOD FOR CASING DAMAGE OF CNG GAS STORAGE WELL AND FIELD TRIAL

摘要

Aiming at the casing damage detection of CNG gas storage wells, this paper proposes a CNG gas storage well casing damage detection method based on the principle of laser ranging. Based on this detection method, the experimental prototype of the measurement device is completed, and the supporting software is also developed. The detection system can detect the size of the inner wall damage and the location of the damage in real time. After debugging the developed testing device, based on the indoor simulation experiment platform, the joint detection of the indoor 7-inch casing and the 9-inch casing and the full-circumference simulated damage indoor inspection of the casing were performed. After analyzing the obtained detection results from the experiment, it can be known that the new detection device has higher detection accuracy with the error less than 5%, showing that the detection results are reliable. Based on the indoor simulation experiment, a field experiment was carried out using a 7-inch casing in a teaching experimental well. The confirmatory experimental results show that the casing damage detection device developed in this paper can complete the detection of simulated casing damage, and the detection results have reached the expected target, which has certain practical value. In addition, it also proves that the laser detection method can be applied to casing damage detection. The feasibility and correctness of the detection provides a certain research basis for the further development of the laser method in the field of casing damage detection.