低渗透油藏CO2吞吐效果分析

低渗透油田应用CO2吞吐可以提高油井产量和油藏采收率。本文介绍了低渗透油藏开展CO2吞吐试验的参数和效果，详细分析了选井选层、注入量、注入速度、注入压力、返排速度、浸泡时间和吞吐周期等参数对CO2吞吐效果的影响。结果表明，11井次低渗透试验井累积注入CO2量2926t，增产油量3348t，平均单井增油304t，平均每吨CO2换油率1．14t，试验成功率不断提高。可见，只要措施得当，效果是明显的。该方法具有投资少、见效快、偿还快、风险小等特点，值得加大CO2吞吐在低渗透油藏中的研究和推广力度。

Analysis on CO2 puff-and-tuff effect in low permeable reservoirs

CO2 puff-and-tuff in low permeable oiltield can increase oil production and recovery. This paper introduces the parameters and effect of CO2 puff-and-tuff in low permeable reservoirs, analy-zes the effect of well and reservoir selection, injection rate, injec-tion pressure, returning speed, soak time and puff-and-tuff cycle on the performance. The result shows that, 11 well tinies of low permeable test wells are injected 2926 t of CO2, the incremental oil production is 3348 t, the average single well incremental oil production is 304 t, and each ton of CO2 gets 1.14 t of oil replacement amount. This method has the advantage of low investment, high ef-ficiencv and low risk.