With the aid of scanning electron microscope, X-ray energy spectrum and metallurgical microscope, corrosion in the places of tubing fracture in Daqing oil fields has been observed. The crack which is due to corrosion has not been obviously observed in the places of crack growing of many fractures, and Sulphur content on the surface of the fractures is little. Keeping metallurgical observation upon microcrack and making energy spectrum analysis of its top, we think that propagation of microcrack is across cr...
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