Abstract: With the development of drilling technology, it is possible to realize the complex process of wellbore intersection. Precise survey tools including ranging tools and communication tools are one of the core factors to determine whether the well can be intersected successfully. The selection and use of intersection tools are the key to intersection technologies. Therefore, it is very important to understand the communication tools for the intersection process. In this thesis, by investigating the current world-wide ranging tools and studying the performance characteristics of each tool, the key points of most typical survey tools are concluded, which can be used as a meaningful reference of well intersection for field work.The results show that the precise survey tools can eliminate the trajectory error of the upper section, clarify the relative position of the two wells, and provide the possibility for intersection. The selection of intersecting well tools needs to be comprehensively considered from the aspects of connecting mode, target well availability and connecting string.