摘要
为进一步提高特低渗JD油田原油采收率,在模拟油藏条件下,开展氮气泡沫驱油效率实验,研究注入方式、注入量、注入速度以及气液比对氮气泡沫驱油效率的影响。结果表明:水驱后转气水交替驱易形成窜流,封堵效果不佳;氮气泡沫驱驱油效率比纯氮气驱驱油效率高;氮气与起泡剂溶液段塞式注入比气液混合注入更适合该区块;采出程度增幅随着注入速度的增加呈现先增大后减小的趋势;当气液体积比为1∶1时,整体采出程度增幅最大。最佳的注入段塞量为0. 1 PV0. 33%起泡剂溶液+0. 1 PV氮气+0. 03 PV地层水+0. 1 PV0. 33%起泡剂溶液+0. 1 PV氮气+0. 03 PV地层水,段塞的最佳注入速度为0. 03 m L/min。现场试验表明氮气泡沫驱能有效提高原油采收率。
In order to further enhance the oil recovery of ultra-low permeability JD oilfield,nitrogen foam flooding efficiency experiment was carried out under simulated reservoir conditions,and the effects of injection mode,injection volume,injection rate and gas-to-liquid ratio on nitrogen foam flooding efficiency were studied. The results show that: after water flooding,gas-water alternating flooding is easy to form channeling,and the plugging effect is not good; Nitrogen foam flooding efficiency is higher than pure nitrogen flooding efficiency;the alternating injection of nitrogen and foaming agent solution is more suitable for this area than the mixing injection of them; The increment of recovery degree increases first and then decreases with the increase of injection rate; When the gas-liquid ratio is 1∶ 1,the increment of overall recovery degree increases the most. The optimum injection slug amount is 0. 10 PV 0. 33% foaming agent solution +0. 10 PV nitrogen + 0. 03 PV formation water + 0. 10 PV 0. 33% foaming agent solution + 0. 10 PV nitrogen + 0. 03 PV formation water,and the optimum injection rate of the slugs is 0. 03 m L/min. Field tests show that nitrogen foam flooding can effectively improve oil recovery.
引文
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