空气驱地面工艺技术优化研究与现场应用

Optimization study and application of surface process technology of air flooding

在海拉尔油田BZ区块特低渗透、低丰度油藏开展注空气驱试验无经验可循,在国内也尚属首次,同时注空气还面临着高腐蚀性、高爆炸风险等问题,因此需要开展配套地面工艺技术研究。简要介绍了工程面临的技术难题,较详细阐述了优选注空气压缩机组、优化工艺流程及管材、优选减氧工艺等技术优化措施及实施效果,并对空气驱工程试验的经济效益进行了评价。最后指出,空气驱矿场试验建立了一整套较为成熟的,适用于高寒少雨多风沙地区特低渗透油藏的空气驱地面工艺技术,填补了技术空白;但在油价走低、注入时率无法保证的条件下,在特低渗透、低丰度油藏,采用空气驱采油是不具备经济开发价值的。

There was no experience referable for air flooding test of ultra low permeability and low abundance oil reservoir in BZ blocks of Hailar Qilfield, and it was the first test conducted in China. Besides, the air flooding test faced the risks of high corrosion and explosion. It was necessary to conduct the research on surface process matching technology. This paper introduces the technical difficult problems in the surface process of air flooding and describes the technical countermeasures such as air compressor unit optimal selection, process flow and pipe material selection, and oxygen reduction process. It also presents the implementation results and evaluates the economic benefits. The surface process technology of air flooding is suitable for ultra low permeability oil reservoir in high, cold and dry area with strong sandy wind. But it does not possess the economic value if oil price declines continuously and air injection time rate is not ensured.