空气泡沫调驱技术在浅层特低渗透低温油藏的适应性研究

Adaptability study of air-foam flooding technique in shallow ultra-low permeability and low temperature reservoir

空气泡沫调驱技术综合了空气驱和泡沫驱的优点,可提高波及系数和驱油效率,在中高温油藏中取得了很好的应用效果,但是在浅层特低渗透低温油藏中的应用较少。根据陕北油区特低渗透油藏地质特征,以甘谷驿油田唐114井区为例,通过理论研究、室内实验和现场试验研究了空气泡沫调驱技术在浅层特低渗透低温油藏的适应性。结果表明:室内实验低渗透层中的原油被明显启动,驱油效率由水驱阶段的8.33%升高到50.55%;矿场试验井组含水率由98%下降至73%,产液量由3m3/d降至0.8m3/d,平均单井产油量由0.05m3/d增至0.2m3/d。空气泡沫调驱技术在甘谷驿油田具有较强的适应性,可大幅度提高油田采收率,对同类油藏的增油控水具有一定的借鉴作用。

The air-foam flooding technique which combines the advantage of air injection displacement and foam flooding has enhanced the sweep efficiency and oil displacement efficiency and achieved well application effect in middle-high temperature reservoirs,however,it is less applicable in shallow ultra-low permeability and low temperature reservoirs.According to the reservoir characteristics of ultra-low permeability reservoirs in Northern Shaanxi,we analyzed the suitability of the air-foam flooding technique in these reservoirs through theoretical studies,laboratory test and field test,taking Tang 114 well area in Ganguyi oil field as an example.The results show that the crude oil in low permeability layers is obvious motivated in the lab experiment,the oil displacement efficiency rises from 8.33% to 50.55%,the water content of the field test well group decreased from 98% to 73%,the daily fluid production rate dropped 2 m3,and the daily oil production is 6 times of that of the original.The air-foam flooding technique has strong suitability in Ganguyi oil field and oil recovery can be greatly enhanced.It has certain reference significance for stabilizing oil output and controlling water content for the similar reservoirs.