Cng Station Gas Well Safety Testing Methods Research

In order to improve the safety status of the CNG station gas storage well, the paper mainly introduces the internal-external defect measurement of the CNG station gas storage well on the basis of the present test theory and the modular test, at the same time also comes up with the best test plan, so as to test the defect area, depth and the orientation of the CNG station gas storage well. The laser triangle ranging system has been designed, and goes on the simulation test of the casing's defect area and depth by the means of the lab transducer, the simulation test of the casing's magnetic flux leakage testing also has been done by the software of ANSYS finite element method and analyze and value the safety of gas storge well casing.The paper analyzed the good points and bad points of the laser ranging, and advanced the laser triangle ranging method to test internal casing, and the method's possibility has been confirmed to test the defect of the tubular. the system modelling is been established using the ANSYS software to magnetic flux leakage testing, and the casing's magnetic property graph (B-H) is also been drawn, at last we can calculate the leak magnetic(B_X) distribution in space, the different corrosion depth's defect magnetic motive density graph is been drawn. On the basis of the calculated data we established stencil-plate database, to increase efficiency of magnetic flux leakage testing.On the theory of the plastic fracture mechanics, the fourth strength and the finite element method, we can get the relation of the destroy strength, the inner pressure strengths and bearing strengths, at last we can come up with the defect casing residul strength evaluation method. The paper studied the combine of magnitics simulation and the laser test indoor experiment, and advanced test mathed can offset CNG station gas stroge well casing testing, which important reference value to study practicability set and insure CNG station safety.