The efficient development of deep coal-rock gas resources, exemplified by the pioneering No. 8 coal seam (buried >2000 m) in the Daning-Jixian Block, Ordos Basin, is of strategic importance. This study investigates the critical role of fracturing fluid flowback behavior in determining post-fracturing productivity. Based on systematic analysis of flowback parameters and dynamic data, we evaluate the impacts of fluid-reservoir contact time and flowback chloride ion concentration on well performanc