关键词: 小井眼钻井, 钻柱, 动力学, 模型, 试验

Abstract: By analyzing the random contact and impact between drilling string and bore hole wall at arbitrary depth and circle direction in slim hole well,a dynamic model of whole drilling string is presented.This model is solved by dynamics gap element which can not only describe the contact and impact between drilling string and bore hole wall but also present the deformation of bore hole wall and energy absorption of mud cake.The dynamic equilibrium equation is solved by Newmark method.Through laboratory test of drilling string dynamics at the normal size simulating drilling device,the theoretical results are verified and the interference force of bit is determined.The field tests in 14 slim hole wells in Daqing Oil Field show that no fatigue failure in the drilling string to be designed by dynamics analysis can be developed,and the better defense inclination is obtained with drilling speed being increased significantly.

Key words: slim hole drilling, drilling string, dynamics, model, test