The fracture failure research on a drilling jar’s top joint was carried out on basis of correlative theories and tests. Macroscopic analysis, dimension measurement and nondestructive testing were done for failure joint. The material’s chemical and physical properties were tested. The drilling strings assembly was analyzed specially and the bending strength ratio between top joint and adapter joint was calculated detailedly. The results showed that the drilling jar’s joint was broken because of fatigue induced by irrational drilling strings assembly and improper matching between top joint and adapter joint. The joint’s fatigue life was reduced further because material’s impact toughness is less than standard value.
Research on a round thread casing connection pullout case and a buttress thread casing connection pullout accident was carried out combining relative theorys with tests. Macroscopic analysis and dimension measurement and material’s physical and chemical properties were checked for casings and couplings. Thread inspection and full-scale tests were done for casing simples that are same lot with pullout casing. Comprehensive analysis was carried out on these results. Two cases history showed that casing connection dropout may take place if make-up location cann’t reach standard location or make-up torque is too little even if the quality of casing and coupling are in accordance with corresponding standards.
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