With the deep development of Sulige Gas Field， the construction of large well clusters and three-dimensional horizontal wells is increasing gradually， which increases the difficulty on trajectory control. Drilling cluster type three-dimensional horizontal wells faces many issues， such as high collision risk； difficulty in slide-drilling due to large friction torque with the long build-up well section； and difficult WOB transfer， wellbore instability and cleaning difficulty due to the long horizontal section and unstable production layer. In view of these problems， a complete set of technical countermeasures have been formed through optimization of the drilling design and the drilling stem， adoption of the salt water drilling fluid system， optimization of the mud motor， and field technical management and the driller’s careful response， which has led to the safe and efficient completion of drilling works.