More accurate calculation of pressure loss in narrow annuli of slim holes and coiled tubing operations is required. 在小眼井和连续油管作业的窄环空中,要求更加准确地计算摩擦压降。
The coiled tubing fatigue belongs to overlow cycle fatigue at multi-axial stress state.The prediction theory of this field is far from comp lete. 而连续油管的疲劳是应力状态较复杂的多轴超低循环疲劳,目前该疲劳寿命预测理论还很不成熟。