Almost all the quality gas reserves of Daniudi gas field have been produced.The remaining gas reserves are low in quality

thus cannot be developed efficiently with vertical wells.Considering the strong heterogeneity

limited sizes of effective sandbodies

low reserves abundance and low single well production rate of the tight sandstone layers

horizontal wells are preferred for the development of the remaining gas reserves.Cluster horizontal well group plays a key role in the practical production.Numerical simulation and dynamic evaluation are integrated to evaluate the exploitation performance of Daniudi gas field with different patterns of cluster horizontal well groups by comparing the pressure drawdown rate and gas production per pressure drop unit.The results demonstrate that the angle between the laterals and maximum principal stress should be larger than 60 degrees

and the minimum distance between these wells should be greater than 500 meter when using horizontal wells cluster group as the development strategy.These understandings will provide a useful reference for the exploitation of similar tight marginal gas fields in Ordos Basin and other basins.