Abstract: Formation particles migration and sand production can lead to the decline of oil production.The study of sanding mechanism is beneficial to propose sand control strategy and improve the development status,which is significant for enhancing the effect of water flooding in unconsolidated sandstone.The reservoir contains a large number of clay minerals,showing strong in water sensitivity,medium to strong in stress sensitivity,and weak to medium to strong in speed sensitivity damage.When the wellbore collapses,the sand production is a little and the particles diameter is small.The particles of layer L50 are easy to start,move and block the formation,and the amount of sanding and particles size is bigger than other layers.By using core samples of the main pay zones,the indoor experiment of sanding is carried out to simulate the oilfield sand production under different conditions.The experimental results can guide the optimization and adjustment of water injection quality,production management and sand control measures in the oilfield.The practical application effect of the field is good,which provides a reference for the development and production of similar offshore oilfields.