COMPLETION TECHNOLOGY OF THE FIRST TAML5 DOUBLE LATERAL WELL AT HOME

A set of completion technology and auxiliary tools for multi - lateral well is developed according to such geological characteristics as multiple production zones, high pressure gradients, dense formation and variability of litbology, etc in west Sichuan area. With the help of the auxiliary tools, the dynamic integrity and mechanical stability at the junction of main hole with branch hole may be achieved; both the main hole and the branch are cemented, and then squeeze sealing fluid at the window, thus more reliable hydraulic seal can be achieved at the junction of main hole with branch hole. A orienting facility is pre - set in the completion string, which ensures the accuracy, continuity and simplicity of the branch hole orientation; by applying auto- positioning and orientating tool,the re-entrance of each branch is ensured; by using the premilled casing and hollow whipstock, the communication between the main hole and branch is then established; zonal pressure isolation and separated fracturing and producing can be achieved through dual tubing string and dual packer. These technologies were successfully used in Well Xinqian - 90, which is double lateral well, and its completion level reached TAMLS.