海上低幅背斜底水薄油藏水平井优化设计方法

Optimization Design of Horizontal Well With Bottom Water And Thin Oil Reservoir of Offshore Low-rising Anticline

综合考虑储层、井筒及FPSO三个关键节点的耦合关系,通过管网数值模拟技术,分析得到了海上低幅度背斜底水薄油藏水平井出水原理,并结合海上油田实际条件优化,得到水平井段最优长度、水平段在储层最佳位置、合理采油速度及生产压差等。研究结果表明,对于高孔高渗底水油藏,水平段应尽可能位于储层顶部,水平段长度400~500 m最佳,综合考虑储层供液、井筒压降及FPSO的集输能力,生产压差控制在0.4~0.6 MPa为最佳。

Considering the coupling relationship between three key nodes of reservoir,wellbore and FPSO,through the network numerical simulation technology,water producing principle in horizontal Well with bottom water and thin oil reservoir of offshore low-rising anticline isanalyzed,and combined with the actual conditions in offshore oil field,the optimal length along the horizontal section in reservoir optimal location,reasonable oil recovery rate and production pressure are got. The research results show that,for high porosity and high permeability bottom water reservoir,horizontal section should be located at the top of the reservoir,the best horizontal section length be400 ~ 500 m,and the proper production pressure difference is controlled in 0. 4 ~ 0. 6 MPa,comprehensively considering reservoir fluid supply,wellbore pressure drop and FPSO gathering ability.