CO2吞吐是致密油藏提高采收率的重要手段,但在实施过程中,CO2吞吐换油率随吞吐周期增加而降低。为提高CO2吞吐换油率,改善CO2吞吐开发效果,采用数值模拟方法,进行变周期注气量的CO2吞吐注采参数优化研究,并开展经济评价。结果表明:变周期注气量的吞吐方案累计产油量为32 983.4 m3,换油率为1.11,高于正交实验的优选方案。经济评价结果显示,变周期注气量的CO2吞吐方案经济效益最好,其净现值为345.07×104元,内部收益率为18.06%。该研究成果可为致密油藏CO2吞吐高效开发提供理论指导。
The oil exchange rate of CO2 huff and puff decreases with the increase of CO2 huff and puff cycle.In order to improve the rate,the numerical simulation method is used to optimize the injection-production parameters of CO2 huff and puff with variable injection time,and the economic evaluation is carried out.The results show that the cumulative oil production of the cyclic gas injection scheme is 32 983.4 m3,and the oil change rate reach to 1.11,which is higher than the optimal scheme of orthogonal experiment.The economic evaluation results show that the CO2 huff and puff scheme with variable cycle gas injection has the best economic benefits,with a net present value of 345.07×104 yuan and an internal rate of return of 18.06%.The research results can provide theoretical guidance for the efficient development of CO2 huff and puff in tight reservoirs.
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