Production efficiency analysis in hydrate reservoir under multi-well systems

Abstract

To achieve the goal of carbon emission reduction, the hydrate is widely concerned for its outstanding advantages such as high calorific value and low pollution. As the output of natural gas still cannot meet the requirements of commercial exploitation, multi-well exploitation will become a technological trend in the future. Therefore, the depressurization mining of hydrate reservoirs under multi-well systems was simulated. The influences of the well branch number, well spacing, and wellhead radius on the soil depressurization characteristics were analyzed. Moreover, two new parameters, depressurization and decomposition areas, are defined to analyze the reservoir depressurized effect and production efficiency. The results show that the more the number of wells, the better the depressurization effect and the longer the duration. The decomposition efficiency of multi-well production in the late mining stage is much higher than that of single-well production. The gas production by multi-well cooperative production is much higher than that by single well production with the same number.