关键词: 水平定向钻技术, 管道穿越工程, 泥浆压力, 计算公式, 管道回拖力

Abstract: The crucial parameters such as bending radius and back drag force were theoretically studied in the pipeline crossing project by using horizontal directional drilling technology.The deficiency of experimental formulas used in the pipeline crossing design was pointed out.The basic factors affecting the parameters of pipeline crossing project were analyzed,and the formulas that were more consistent with the project practice were given.Considering the basic function of drilling fluid,new concepts of the minimum required mud pressure and the maximum allowed mud pressure were put forward,and corresponding formulas were deduced.The optimum scheme for a certain pipeline crossing project was selected,and the quantitative values of key crossing indices were obtained by using the relevant theories of pipeline crossing.On the basis of analysis and comparison of the key parameters,the best scheme for the real project was determined,and good benefits have been achieved.

Key words: horizontal directional drilling technology, pipeline crossing project, mud pressure, computation formula, pipeline back drag force