提高鸭儿峡油田表外储量水驱效率的对策

The Measures for Improving Waterflood Efficiency of Useless Reserves in Ya'erxia Oilfield

通过对玉门鸭儿峡油田表外储量、砂体几何形态、沉积韵律、连通特性等特征的研究,就不同沉积环境下所形成砂体的注水开发特征进行了详细论述,并提出了相应的油层压裂、酸化等开发工艺措施,认为,注水开发效果取决于砂体的非均质性,残余油主要分布在低孔、低渗带内。因此,在调剖时应控制主要砂体的产能,同时要兼顾低产能砂体;选择压裂层位时,应压开低渗透层,以利于注入水的均匀推进。这一研究成果为改进玉门鸭儿峡油田开发方案及提高采收率提供了依据。

In this paper, the useless reserves, sand body geometry, sedimentary rhythm and interconnecting feature of Ya'erxia area in Yumen field are investigated, along with detailed discussion of waterflooding characteristics of sand body shaped in different settings, by which relevant technological measures for formation fracturing and acid treatment are proposed. It is suggested that the waterflooding effect depends on heterogeneity of the sand bodies for most remained oil distribution in zones with low porosity and low permeability. Hence, in waterflood profile control, the productivity of major sand body should be controlled, considering those low-productivity sand bodies; in selection of properly fracturing horizons, low permeable zones should be fractured primarily in favor of even advancing of injected water. This result can be as a guide for improving development effect and EOR of Ya'erxia oilfield.