关键词: 水平井, 管柱, 力分析, 有限元法, 测井

Abstract: It is an extremly important problem in horizontal well is that if the logging instrument can resch bottom hole by the string weight, thelogging string is very thin and its weight is very light.Therefore, a whole string mechanical model is established in the paper, and the multi-directional contact gap element theory is applied to analyzed the contact non-linear prodledm.In the model, the whole logging string is studied and the initial gap and the random contact frictional resistance between the logging string and the hole wall are considered. In Daqing oil field, the logging string forec of MPI well is analyzed by the theory in five working conditions, which shown that the minimum hook load is 15.83kN and the well head string is in tensile state so that the logging instrument can reach bottom hole by the string weight and no injector is needed.The analysis result is applied successfuly in engineer, hence, a new calculation method for the force analysis of logging string is presented and provides a technique for predicting the logging instrument to reach bottom hole whether by the string weight or an injector.

Key words: horizontal well, string, force analysis, finite element method, logging