Abstract: A branch adjustment well in Weizhou Oilfield in the western South China Sea is facing problems such as long open holes, small boreholes, high permeability and porosity in shallow formations, and high difficulty in integrated sand and water control completion. In order to reduce the water cut of the adjustment well and ensure the maximization of reservoir productivity, an integrated sand and water control design model was developed based on reservoir characteristics and operational risk analysis. The difficult problem of gravel packing in loose formations of long open holes with 6'' small boreholes has been successfully solved on site. The packing efficiency has reached 125%, and the initial oil production has reached 230 m³/d, exceeding the designed production by 1.5 times. The water control performance is favorable, and it has good guiding significance for the implementation of sand control and water control technology in similar adjustment wells.