Strategies and Techniques for a Giant Sandstone Oilfield Development: A Road Map to Maximize Recovery

摘要

Daqing, the largest heterogeneous multi-layer none marine reservoir oilfield in China celebrated its 45th birthday in Ocotober 2005. Boasting 27 continuous years of plateau oil production over one MMBOD, the largest industry polymer- flooding oilfield in the world, and excellent developing effect, its development strategies and techniques applied provide a road map to maximize oil recovery: ? Life cycle reservoir studies give insight into reservoir, and provide a foundation for plan of development, implementation of infilling, and associated workover jobs such as zonal stimulation, zonal water plugging. ? Early reservoir pressure maintenance by internal water flooding maintains reservoir pressure close to its original status, providing sufficient reservoir energy, enabling high and stable production rate for a long period as well as improving recovery. ? Performance monitoring conducted in the whole process of development, of which, separate layer performance monitoring is one of the most important foundation for in- depth understanding subsurface development potential. ? Pilot tests are conducted before any key development strategies and measures are applied to ensure their success. ? Separate layer production/water injection of multi-layer and heterogeneous reservoir and novel completion are the key measures for enhancing poorly drained reservoir water flooding, improving its sweeping efficiency. ? Multi-time and progressive infilling drilling develops bypass oil resulting from the geological complexities of reservoirs. ? Widely applying polymer flooding enhances oil recovery by over 10%. ? Innovative technology makes development of marginal reservoirs/fields economical. Outstanding development of the giant field has proven the validity of above strategies and techniques with an oil recovery factor current at over 51% in the main block.