Influence of Well Pattern Type on Remaining Oil Saturation and Distribution after Development

The reservoir heterogeneity of Q oilfield is more severe after long-term water injection development, and flooding ineffective. In this study, the combined technologies profile control, control flooding, oil displacement were proposed to improve development effect. Then, influence well pattern type on remaining distribution, was investigated. Cr3+ polymer gel, which has an optimal gel-forming effect, used as agent. Moreover, entire molecular structure had a “network” structure. A microsphere agent, showed good hydration expansion capacity. initial particle size distribution range 7.2–11.1 μm, multiple 4.35–5.64 7 days. surfactant interfacial tension approximately 5.08–5.11 × 10−1 mN/m. After “profile + displacement” technologies, horizontal large seepage area. effect expanding sweep volume significant, saturation in each stage lower than those vertical horizontal–vertical patterns. Compared with first stage, values three permeable layers changed by 11.9%, 17.3%, 19.8% during subsequent stage.