Three-dimensional horizontal well body section design method

The invention relates to a three-dimensional horizontal well body section design method. The three-dimensional horizontal well body section design method includes the following steps that on the basis of deflecting capacity of existing well drilling tools and drilling tool assemblies, key design parameters of a first deflection point, a first deflection increasing well section, a direction turn point, a direction turn section, a second deflection point, a second deflection increasing well section and the like of a three-dimensional well section are optimized through computational analysis of actual drilling friction and torque, analysis and adjustment are optimized, the drilling friction and torque of a three-dimensional horizontal well are minimized, and three-dimensional horizontal well body section optimal design is achieved. As for the three-dimensional horizontal well body section designed according to the method, a well track is smooth, actual drilling track control difficulty and well drilling friction and torque are low, and the three-dimensional horizontal well body section design method is closely combined with the existing well drilling tools and field applications and has high application, popularization and adaption performance. The section design method can adapt to design of any three-dimensional horizontal well body section with offset.