Abstract: Siltstone even clay sand exist in many wells in Gudong Oilfield which influence producing seriously.To resolve this problem, a method to use JHS-3 agglutination sand for siltstone prevention has been researched.Basic formulation, main technique index and sand control mechanism for agglutination sand are introduced.After its adaptability is analyzed, a conclusion was get, 3 factors including layers of wells, treatment radius and pressure appreciation which affect sand control and water plugging directly with agglutination sand.From the application in 20 wells in field, it show that agglutination sand can prevent siltstone and clay sand effectively, and improve fluid profile section evidently.It has gained good effect on reducing water production and increasing oil production.