延长油田三次采油技术适应性研究与应用

Research and Application of Adaptability of Tertiary Oil Recovery Technology in Yanchang Oilfield

延长油田区域构造属陕甘宁盆地东部斜坡带,主要分布在延安、榆林等4市20个县区,平均渗透率在(0.5~1.44)×10^-3μm^2,孔隙度为10%,属于低渗、低孔、低压油田。原油启动压差大,地层吸水能力低,难以有效驱替,严重制约着长远发展。结合延长油田技术现状,开展了配套的三采技术研究,包括微生物驱、生物活性驱、空气泡沫驱及CO2驱等,形成了适合延长的三采技术体系。创新性的将生物活性驱油与调堵剂结合,提高了波及体积和驱油效率,形成了生物活性复合驱油技术体系;空气泡沫驱试验可实现稳油控水,为发展高含水期油田技改方向提供数据支撑。

The regional structure of Yanchang Oilfield belongs to the eastern slope belt of Shaanxi-Gansu Basin.It is mainly distributed in 20 counties and districts in 4 cities including Yan’an and Yulin.The average permeability is(0.5~1.44)×10^-3μm^2,and the porosity is 10%.Low permeability,low porosity and low pressure oil fields.The crude oil has a large starting pressure difference and a low water absorption capacity of the formation,which is difficult to effectively displace,seriously restricting long-term development.Combined with the status quo of Yanchang oilfield technology,it has carried out research on supporting third mining technology,including microbial flooding,bioactive flooding,air foam flooding and CO2 flooding,etc.,forming a suitable third mining technology system.Innovative combination of bioactive oil displacement and plugging agent improves sweep volume and oil displacement efficiency,forming a bioactive compound oil displacement technology system;air foam flooding test can stabilize oil and control water,and develop high water cut for oil field extension Provide data support for the direction of oilfield technological transformation.