Sand production mechanism and sand control technology status and prospect of oil-gas reservoir type gas storage

The production characteristics of depleted reservoir underground gas storage will aggravate the risk of sand production in the reservoir. Efficient and long-term sand production prevention and control is an important technical guarantee for the safe operation of gas storage. The production conditions of the depleted reservoir underground gas storage will be in high-flow injection-production alternation for a long term, which causes the cyclic alternation of formation pressure/stress magnitude, fluid flow direction and gas-water interface migration. Therefore, it is much more complex to figure out sand production mechanism and to predict sand production, which brings serious challenges to the efficient and long-term sand production prevention and control. Firstly, the characteristics of depleted reservoir underground gas storage production conditions and their influence mechanism on the evolution of reservoir rock properties were systematically analyzed, the mechanism and main controlling factors aggravating and inducing sand production were analyzed and summarized, and the current progress in sand production simulation and prediction methods was summarized. On this basis, the status of sand control technology for gas storage at home and abroad was analyzed and summarized. In general, there still lacks mature sand control technology system for gas storage production characteristics. Finally, for sand production prevention and control technology of gas storages, the engineering problems and scientific problems that need to be urgently solved were systematically analyzed, and the future development trend was briefly prospected, which provide a reference for studying sand control and completion schemes during the large-scale gas storage construction in the future.