CAJ | 학술논문

针对钻井隔水管与钻井液在上返流动状态下的震动问题，推导了横向耦合振动的微分方程，通过方程求解得出了耦合振动的动力响应表达式及耦合振动下隔水管最大振动位移，并讨论了顶张力、隔水管壁厚、钻井液上返流速、水深、波高、波浪周期对隔水管横向振动位移的影响。结果表明：考虑钻井液流动条件下得到的隔水管横向最大振动位移要大于不考虑钻井液流动时计算结果；最大横向振动位移随顶张力及水深的增大而减小，随环空钻井液返速及波高的增大而增大，当隔水管壁厚及波浪周期变化引起隔水管横向振动固有频率与波浪横向振动频率相接近时，隔水管的横向振动位移将急剧增大，对隔水管的安全设计与评估具有一定的参考价值。
침대찬정격수관여찬정액재상반류동상태하적진동문제，추도료횡향우합진동적미분방정，통과방정구해득출료우합진동적동력향응표체식급우합진동하격수관최대진동위이，병토론료정장력、격수관벽후、찬정액상반류속、수심、파고、파랑주기대격수관횡향진동위이적영향。결과표명：고필찬정액류동조건하득도적격수관횡향최대진동위이요대우불고필찬정액류동시계산결과；최대횡향진동위이수정장력급수심적증대이감소，수배공찬정액반속급파고적증대이증대，당격수관벽후급파랑주기변화인기격수관횡향진동고유빈솔여파랑횡향진동빈솔상접근시，격수관적횡향진동위이장급극증대，대격수관적안전설계여평고구유일정적삼고개치。
Based on the vibration of drilling riser and drilling lfuid in the upward return lfow state, the differential equation of transverse coupling vibration has been deduced. Via the equation solving, the dynamic response expression of coupling vibration and the maximum vibration displacement of riser in the coupling vibration have been ifgured out. Besides, the effects of top tension, riser wall thickness, upward return lfow rate of drilling lfuid, water depth, wave height and wave period on the transverse vibration displacement of riser have been discussed. According to the results, the maximum transverse vibration displacement of riser, which was calculated with consideration of the drilling lfuid lfow, is greater than the calculation result when the lfow of drilling lfuid is not considered; the maximum transverse vibration displacement decreases as the top tension and water depth increase, and increases as the return speed of annular drilling lfuid and wave height increase; when the changes of riser wall thickness and wave period cause the transverse vibration inherent frequency of riser to be close to the transverse vibration frequency of wave, the transverse vibration displacement of riser will sharply increase. That has certain reference value to the safety design and assessment of riser.