Metallurgical analysis ascertains downhole pump failure cause

F. Elshawesh, E. Elagdel, A. Elhoud Petroleum Research Center Tripoli, Libya Intergranular fractures in the bolts that failed are seen in this macroscopic photograph (20x; Fig. 1). Metallurgical analysis attributed bolt failure of several oil well submersible pumps to a problem with quality control during the manufacturing process of the bolts. The Monel K-400 flange bolts that failed connected the motor sections with the motor protectors. The examined bolts were found to have different microstructures because of different manufacturing processes or quality control. The bolt failure may be attributed to the grain coarseness and segregation of some elements in the grai...

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