Abstract:According to the sand control test of argillaceous silty fine sand hydrate reservoir, the change of seepage characteristics of strata and packed gravel directly affects the evolution mechanism of sand production. Based on the argillaceous fine sand hydrate reservoir and gravel filling sand control structure, the self-developed sand control test system was used to carry out sand control test. The gas-liquid seepage characteristics and sand production phenomena were studied from the complete test (from the beginning of the test to the stage of no-liquid seepage) and time intervals (2, 4, 6, 8 minutes), respectively. The formation of reservoir mud film and sand control structure was measured by micro-structure, water content and density, and the following conclusions were obtained: (1) The whole sand control test was divided into four stages, namely, initial seepage stage, stable seepage stage, rapid seepage stage and non-liquid seepage stage; (2) Comparing the whole test with the sectional test, the whole sand control test could be divided into four stages: initial seepage stage, stable seepage stage, rapid seepage stage and non-liquid seepage stage. The characteristics of gas-water seepage are similar, and its seepage law was almost unaffected by time; (3) The seepage law of argillaceous silty fine sand reservoir had the characteristics of stratification, the liquid stratification in reservoir had migrated, and its migration had led to the consolidation of soil layer, forming consolidation circles with different stability, that was, stable, relatively stable and weak stability. Mud film consolidation circle and undisturbed reservoir; (4) Sand production evolution law was: Reservoir fluid steady seepage→Transport of Fine Solid Particles by Liquids→Sand Control Structure of Fine Particle Invasion in Reservoir→Gas-Water Accelerated Seepage→Massive Sand Production→Formation of Sand-control Structure with Mud Film and Sand-control Gravel.