Model predicts drill pipe fatigue in horizontal wells

Jiang Wu Maurer Engineering Inc. Houston Equations [42490 bytes] A computer model helps predict the endurance limit of drill pipe used in medium and short radius horizontal wells. Drill pipe fatigue, and subsequent failure, can be a major problem when drill pipe is rotated in short radius build sections of horizontal wells. Rotating the drill pipe during downhole motor drilling can often increase penetration rates 50-200% in short and medium radius wells because of the reduction in frictional drag. Rotating drill pipe in short radius (30-50 ft) horizontal wells, however, can result in drill pipe fatigue failures after four to eight wells. Monitoring drill pi...

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