Optimization of Sand Control Methods and Parameters Selection for Shallow-Gas Fields in Deep-Water

In order to solve problems such as high sand production and difficulties in sand control during the development of deep water gas wells,sand control design optimization for deepwater gas wells has been developed.Reservoirs in Liwan 3-1 Gas Field,the first deep water high yield gas field with low overburden pressure,poor diagenesis and weak cementing strength.In view of these characteristics,a special large sand control physical modeling device was developed,then sand control design for deepwater gas field was optimized by using physical experiments and field data.The device is able to simulate conventional sand control with high quality screen or gravel packing under deepwater gas field conditions.Through a number of physical models of sand control mode and sand control parameters,the best sand control policy(wire netting screen+gravel packing in open hole+moderate ream to increase gravel thickness)was put forward to improve productivity.Studies show that the difference between sand control of gas well and oil well lies in the fact that sand carrying effect of gas is much higher than sand retention effect of gravel thickness increase.To achieve optimum productivity and sand production,gravel thickness should be controlled within 60.96 mm to ensure sand production less than 0.001 cubic meters.