摘要
钻柱在井底的接触力计算是一个复杂的非线性问题.选取较为精确的三维钻柱力学模型(简称ABIS)作为研究对象,力图从复杂的求解过程中探索出更直观的方法.从钻柱某个节点的接触力与位移关系,推广到该节点接触力与钻柱其他所有节点的位移均存在同样的关系,进而建立了整根钻柱位移与作用在钻柱上的所有接触力的更直观的柔度关系式.据此提出新的接触力计算方法,算例结果表明该方法显著提高迭代速度.
The calculation of the contact force on the drillstring in the hole is a complex nonlinear problem. This paper proposes a simple and direct method to tackle the problem. Firstly, a more precise model of 3D drillstring mechanics （which is called ABIS in short）is chosen. The contact force and the displacement of the drillstring on one node is computed. Then, the relationship between the contact forces on all other nodes and the displacement of this node is generalized. Then, the flexibility formulation is developed from them, describing the influence of the whole set of contact forces on the drillstring displacement, which is more explicit than that of the ABIS. Through that formulation, a new method of computing the contact force of drillstring is obtained and tested, which greatly increases the speed of iteration.
出处
《力学与实践》
北大核心
2014年第4期457-460,452,共5页
Mechanics in Engineering
基金
国家自然科学基金资助项目(5127505)
