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欢 17块油藏开采 2 0年 ,蒸汽吞吐采收率已超过 2 0 % ,目前油层压力已降至 4MPa左右 ,面临转换开发方式的迫切需要。通过代表性的锦 2 0 4块蒸汽驱、水驱、氮气驱、天然气驱和氮气 +磺酸盐水驱开发方式的研究 ,结合经济评价 ,认为欢 17块下一步应立足于常规注水开发。转水驱的最佳时机为继续蒸汽吞吐生产 30 0d后 ,注水温度 5 0℃ ,注水速度 2 5 0t/d ,最佳采注比 1 0
Huan 17 reservoirs mining 20 years, steam huff and puff recovery rate has exceeded 20%, the current reservoir pressure has dropped to 4MPa or so, facing the urgent need for conversion development. Based on the study of 2040 steam flooding, water flooding, nitrogen flooding, natural gas flooding and nitrogen + sulfonate water flooding development, combined with economic evaluation, it is considered that the next step should be based on conventional water flooding development. Turn the water flooding the best time to continue after the steam huff and puff production 30d, water temperature 50 ℃, water injection speed 250t / d, the best extraction ratio 10