The sand production analysis and experimental of the Production Well in the Bohai Bay middle oilfield

Field investigation on offshore platform in the middle part of Bohai Bay indicates that severe sand production from production well may lead to severe sand fill, even sand plug, in separators or electric dehydrators, and damage to facilities like pumps. In order to test the sand production of single well and assess the properness of sand control measures, a heated vacuum filtering experimental apparatus was built and indoor oil/sand separation test and analysis was conducted taking Oilfield A in mid-Bohai Bay as the research object. The result shows that, among the present sand control manners, the gravel packing mode works more effectively than independent premium screen pipe, and that large sand production in some production wells is mainly due to the fact that the production pressure differential is greater than the critical production pressure differential of the reservoir. The research findings provide a favorable basis for preparation of offshore oilfield production system or optimization of engineering designs, and also provide reference basis for the development and production of similar oilfields.