Study on gravel packing completion technology of sandstone geothermal well

Abstract

Nowadays, The sandstone reservoirs in bohai Bay Basin are mainly in Neogene Ng Formation, The stratum depth is between 1300 and 1500m, Sand flow from thermal reservoir is more serious, Seriously affecting the production of geothermal Wells.To solve this problem, The usual method is to put wire wound screen into the sandstone reservoirs for sand control, But in the process of long-term use, Corrosion or wear may occur around the wire, Sand cannot be effectively prevented from entering the wellbore, Sand control effect will be greatly reduced and the life of geothermal Wells is rapidly shortened. In order to improve sand control effect and to drill good geothermal Wells, The gravel pack completion process was used. This paper summarizes the sand outflow from geothermal wells in Bohai Bay Basin in recent years, and combine formation parameters? physical property parameters with formation pressure parameters during production?then determine gravel diameter, screen mesh, and gravel running speed during gravel pack completion,and developing an effective completion program for geothermal Wells finally, and it can provide reliable basis and reference for sand control of sandstone geothermal Wells in Bohai Bay Basin.