###### Abstract  
Argillaceous fine silt hydrate reservoirs have a clay content of 20-25% and a median sand particle size of 10-15 um. Sand control is extremely difficult, restricting the continuous and stable testing of gas hydrate. This paper focuses on the sand production mechanisms, plugging characteristics, and clogging mechanisms of these hydrate reservoirs. Based on the actual characteristics of hydrate reservoirs, it presents an understanding of the sand production mechanism of argillaceous fine silt. The characteristics and properties of three different sand control methods and six kinds of sand control screens are analyzed. Clear design concepts for sand control screens in argillaceous fine silt hydrate reservoirs are proposed. Two types of new sand control screen with metal filter screens and pre-filled screens have been innovatively designed, and the sand control ability and overflow performance of the screens are evaluated using the meter production index conversion method. Sand production simulation and comprehensive experimental evaluation and analysis of the flow performance of seven kinds of screens (themselves from two categories of screens) were carried out using a self-made special experimental testing device. The experimental results show that the newly designed screens have good flow performance and can meet the requirements of a certain gas production rate. Specifically, Class A metal screens (60/70 mesh) and Class B pre-filled screens (40/70 mesh) have excellent sand control capacity and flow performance, with 10 g sand output and 300 L total water output, thus fulfilling the sand control requirements and achieving the purpose of \"effective sand control, prevention without plugging, and continuous stable production\" of argillaceous fine silt gas hydrate reservoirs. They therefore provide a reference for future research on sand control and new screen designs for argillaceous fine silt hydrate reservoirs. argillaceous fine silt; gas hydrate; new sand control screen; experimental evaluation 20242141021910  
included theoretical analysis, numerical simulation, experimental verification, and field trial testing applications such as theoretical analysis developed from the basis of rock mechanics and analysis of the migration of individual sand particles. The laws and mechanisms of sand production in hydrate reservoirs under different parameters have been studied via numerical simulation methods. Sand control testing and the dynamic characteristics of sand control in hydrate reservoirs with different levels of sand control accuracy have also been verified and evaluated experimentally, and the laws and mechanisms of sand control in argillaceous fine silt hydrate reservoirs have been studied and analyzed. The concepts, methods and parameters of preliminary sand control in argillaceous fine silt hydrate reservoirs have been explored in field trials, and as a result, preliminary methods of gravel filling and composite sand control have been formed. However, sand production in argillaceous fine silt hydrate reservoirs is a complex multi-field heat-fluid-solidification-chemical coupling process, which is characterized by multiple scales, nonlinearity, etc., and there have been few systematic discussions on the sand production laws and plugging mechanisms of argillaceous fine silt hydrate reservoirs. The evaluation and optimization of sand control methods have scarcely been carried out, and the construction of new targeted sand control screens have scarcely been explored and built; moreover, methods of integrating the \"theoretical analysis-mode optimization-screen design-screen evaluation\" process have been researched relatively little. Therefore, by systematically describing the characteristics of argillaceous fine silt hydrate reservoirs, this paper studies the main sand production mechanisms, plugging characteristics, plugging mechanisms, etc., and carries out the evaluation and optimization of sand control methods.