EXPERIMENT OF SANDING PRODUCTION MECHANISMS IN UNCONSOLIDATED SANDSTONE RESERVOIRS

The experiments were used to study the sanding production mechanism in Unconsolidated Sandstone Reservoirs.The effects of sanding production are investigated using the sand-packed glass plate model.The factors influencing heterogeneity,mobilization,permeability and fluid velocity are analyzed.The experiment results show that macroscopic throats forming is a catastrophic process in main stream line.Above a critical sand producing velocity,with the increment of the flow velocity,sand producing velocity increases quickly, and cementation intension is more higher,the content and velocity of sand producing are smaller than before.Under the same percolation flow velocity,the content of sand producing is smaller with the bigger permeability.The content of sand producing increases with the increase of crude oil viscosity.The variety of a sand producing proves that cementation intension and hydraulic sand washing are important factors which affect formation sanding production.Once the macroscopic throats forms in formation,water cut in well increases,and oil recovery reduces to 36 percent.The experiment results are useful for preventing sanding production in oilfield.