Abstract
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.
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