The first large-scale colloidal dispersion gel (CDG) pilot test was conducted in the largest oil field in China, Daqing oil field. The project was initiated in May 1999, and injection of chemical slugs was completed in May 2003.This paper provides detailed descriptions of the gel-system characterization, chemical-slug optimization, project execution, performance analysis, injection facility design, and economics. The improvements of permeability variation and sweep efficiency were demonstrated by lower water cut, higher oil rate, improved injection profiles, and the increase of the total dissolved solids (TDS) in production wells.The ultimate incremental oil recovery (defined as the amount of oil recovered above the projected waterflood recovery at 98% water cut) in the pilot area would be approximately 15% of the original oil in place (OOIP). The economic analysis showed that the chemical costs were approximately U.S. $2.72 per barrel of incremental oil recovered. Results are presented in 15 tables and 8 figures.* Reservoir quality: Daqing classifies reservoir quality into three types; Type I reservoirs have the best quality, with good continuity, thick sand layers (>3 m), and higher permeabilities (>300 md); Type II reservoirs have poorer quality, with less continuity, thinner sands (1 to 3 m), and lower permeabilities (>100 md); and Type III reservoirs have the worst quality, with discontinuous sand layers, thin pay (<1 m), and low permeabilities (>10 md).
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