1·The surfactant and polymer mixed system slug is well on recovery ratio but the additional cost of ton oil is higher, economic benefit is not satisfactory.
而注表面活性剂和聚合物的复配体系段塞后热水驱虽然提高采收率幅度较大，但吨油新增成本较高，经济上不合理。
2·Hydrolyzed polyacrylamide (HPAM) has been widely used in oil field for boosting the crude oil recovery ratio.
水解聚丙烯酰胺被广泛应用于油田以提高原油的采收率。
3·Recent years, the important measure to increase the crude oil recovery ratio is using displacing fluid.
近年来，提高原油采收率的重要措施是使用驱替液。
4·Along with the development of oil and gas resources, the technology of stratum testing is more and more important in increasing the recovery ratio.
随着油气田的开发，地层测试技术对提高采收率是十分重要的。
5·Therefore, reservoir protection has been the key factor for enhancing oil and gas production and recovery ratio.
保护油气层已成为提高油气产量和采收率的关键因素。