摘要：Unconsolidated sandstone reservoirs in sea ar- eas are widely distributed around the world. Poor ce- mentation can easily lead to the emergence of uncon- trollable sand production during the development process, which affects the continued progress of off. shore oil and gas development. At the same time, the problem of sand production during the development of unconsolidated sandstone reservoirs will also have a certain impact on the marine environment and marine life. This paper first carried out the experi- ment on the mechanical characteristics of the uncon-solidated sandstone reservoir at sea. Then, based on the experimental data, we constructed the unconsol- idated sandstone reservoir development sand pro- duction simulation analysis by using the fluid-solidcoupling finite element model, and analyzed the sand production evolution law and the impact of produc- tion pressure difference on the sand production. Theresults of the study found that: (1) Sand productionis prone to occur during the development of offshore unconsolidated sandstone reservoirs, which is usu- ally more serious in the early stages of development. As development operations continue, the bottom hole sand production rate will gradually slow down. Under the production pressure difference of 2.5MPa, the sand production rate was 33.83g/d during 3 days of development, and then dropped to 6.97g/d during the 30 days of development. The drag effect is weak, and the production pressure difference is low. How- ever, with the increase of the production pressure dif- ference, the drag force of the reservoir pore fluid onthe rock skeleton particles increases rapidly, causing the rock skeleton particles to easily break away from the sand and enter the wellbore. In order to ensure the safe development of the oil well, it is recom- mended that the bottom hole production pressure dif ference should not be higher than 2.50MPa. This study can provide reference for the design and opti- mization of the development plan of offshore uncon- solidated sandstone reservoirs.
