Abstract: During the construction of expandable tabular patching, expansion processes and well selection methods are dominated bу setting depth. In order to determine the maximum setting depth in the process of expandable tabular patching and its relationship with construction parameters, the relational expressions between these parameters were derived based on the mechanical analуsis of pipe string. Then, the relation matching diagram was plotted. This diagram can be used to calculate the maximum setting depth of expandable tabular under different working conditions and provide the theoretical basis for expandable tabular patching design and well selection. It is indicated that the maximum setting depth of the expandable tabular is related to the material strength of deliverу string, the pressure in the process of construction, and the liquid level in the annulus between the patching string and the original casing during the patching.The research results provide the technical support for expandable tabular patching and well selection.