钻柱力学三原理及定性模拟实验
发布时间：2019-08-20 16:48
【摘要】：在一般力学中,系统都要遵循平衡原理、最小势能原理和最小耗散功率原理。钻柱力学也遵循这三原理。钻柱的任何一点、任何时刻,都必须满足力学平衡方程;若出现多解,先用最小势能原理判断;若还存在多解,则用最小耗散功率原理判断。用钻柱失稳问题说明了最小耗散功率原理不包含最小势能原理;不可用最小耗散功率原理取代最小势能原理。实验发现:1杆柱的转速越高,其挠度越小,越靠井筒中心。2存在涡动状态转换临界转速。当转速低于此临界转速时,随着转速的增加,耗散功率增加;当转速高于此临界转速时,随着转速的增加,耗散功率先迅速降低并且杆柱的挠度突然减小,然后随着转速的增加,耗散功率又增加。3液体的黏度越大,涡动状态转换临界转速越小;轴向载荷越大,涡动状态转换临界转速越小。钻柱力学三原理为复杂的钻柱动力学问题的多解性判别提供了新的判据。
[Abstract]:In general mechanics, the system should follow the principle of balance, the principle of minimum potential energy and the principle of minimum dissipative power. Drill string mechanics also follows these three principles. Any point of drill string must satisfy the mechanical equilibrium equation at any time. If there are multiple solutions, it is judged by the principle of minimum potential energy, and if there are still multiple solutions, it is judged by the principle of minimum dissipative power. With the problem of drill string instability, it is shown that the principle of minimum dissipative power does not include the principle of minimum potential energy, and the principle of minimum dissipative power can not be used to replace the principle of minimum potential energy. The experimental results show that: (1) the higher the rotating speed of the rod string is, the smaller the deflection is and the closer it is to the center of the wellbore. (2) there is a critical speed of vortex state transition. When the rotational speed is lower than this critical speed, the dissipative power increases with the increase of rotating speed; when the rotational speed is higher than this critical speed, the dissipative work decreases rapidly and the deflection of rod string decreases suddenly, and then the dissipative power increases with the increase of rotating speed. 3 the greater the viscosity of liquid, the smaller the critical speed of vortex state transition; the larger the axial load, the smaller the critical speed of vortex state transition. The three principles of drill string mechanics provide a new criterion for judging the multiple solutions of complex drill string dynamics problems.
【作者单位】： 燕山大学石油工程研究所;
【基金】：国家自然科学基金项目(No.51244004,No.51374183,No.51490653)资助
【分类号】：TE21
本文编号：2528756
[Abstract]:In general mechanics, the system should follow the principle of balance, the principle of minimum potential energy and the principle of minimum dissipative power. Drill string mechanics also follows these three principles. Any point of drill string must satisfy the mechanical equilibrium equation at any time. If there are multiple solutions, it is judged by the principle of minimum potential energy, and if there are still multiple solutions, it is judged by the principle of minimum dissipative power. With the problem of drill string instability, it is shown that the principle of minimum dissipative power does not include the principle of minimum potential energy, and the principle of minimum dissipative power can not be used to replace the principle of minimum potential energy. The experimental results show that: (1) the higher the rotating speed of the rod string is, the smaller the deflection is and the closer it is to the center of the wellbore. (2) there is a critical speed of vortex state transition. When the rotational speed is lower than this critical speed, the dissipative power increases with the increase of rotating speed; when the rotational speed is higher than this critical speed, the dissipative work decreases rapidly and the deflection of rod string decreases suddenly, and then the dissipative power increases with the increase of rotating speed. 3 the greater the viscosity of liquid, the smaller the critical speed of vortex state transition; the larger the axial load, the smaller the critical speed of vortex state transition. The three principles of drill string mechanics provide a new criterion for judging the multiple solutions of complex drill string dynamics problems.
【作者单位】： 燕山大学石油工程研究所;
【基金】：国家自然科学基金项目(No.51244004,No.51374183,No.51490653)资助
【分类号】：TE21
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