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为了更好地了解连续管在井下的力学行为,针对不同的井身结构并考虑水平井在内的全井段模型,开展了连续管井下力学试验研究。试验考虑相似原理设计和现象观察,初步采用钢丝模拟连续管,用有机玻璃管模拟井筒。拟采用人工记录和计算机数据采集系统相结合的方法记录试验数据。试验结果表明,试验系统能够较完整地模拟连续管在井筒内的屈曲、屈曲锁死、井口屈服和解除屈曲;在试验台架能力范围内,井筒的弯曲段部分仅发生平面正弦屈曲,不发生螺旋屈曲;解除屈曲过程首先释放首端轴向力,直到首端轴向力小于等于末端轴向力时,随着首端轴向力的进一步释放,末端轴向力才同步释放。
In order to better understand the mechanical behavior of continuous tube in the well, a continuous downhole mechanical test was carried out for different wellbore structures and considering the whole well section of the horizontal well. The experiment considered similar principles of design and observation of the phenomenon, the initial use of steel wire simulation of continuous tube, with plexiglass tube to simulate the wellbore. It is proposed to record the test data by a combination of manual recording and computer data acquisition system. The experimental results show that the test system can simulate the buckling, buckling, wellhead yielding and buckling of the continuous tube in the wellbore completely. Only the plane sinusoidal buckling occurs in the curved section of the wellbore within the scope of the test bench, Spiral buckling; release buckling process first release the axial force at the head, until the first axial force is less than or equal to the end of the axial force, with the further release of the axial force at the head, the end of the axial force was released simultaneously.