关键词: 窄条带状油藏, 含水上升类型, 主控因素, 灰色关联分析, 稳油控水

Abstract: In view of the diversified patterns of water cut rise in a single well of narrow banded reservoirs and the difficulty in control，the regularity and main controlling factors of such water cut rise are studied by comprehensively using such approaches as statistics and gray correlation analysis based on the curve of water cut versus dimensionless recovery degree of a single well，and targeted control measures are proposed. The results show that there are mainly three patterns of water cut rise in narrow banded reservoirs：stepwise，convex and sloped rises. Among the three types，stepwise rise prevails. The duration of water-free oil production lasts long when the rise in water cut presents a convex pattern，but varies greatly when the rise presents a stepwise or sloped pattern. The innate and acquired factors affecting water cut rise mainly include oil-water viscosity ratio，channel width，formation coefficient，effective direction，fluid production intensity，and injector-producer spacing. It has been set out that the injector-producer spacing should be rationally designed according to the forms of river channels，and controlling the intensity of fluid production in the initial stage is the key to stablize oil production and control water. Moreover，different measures should be taken to stabilize oil and control water for different types of oil wells in different development stages. In 2021，measures to stabilize oil and control water were taken in wells for 22 times guided by this thinking，with an annual oil increase of 4.8×10⁴ m³ and an average water cut decrease of 1.5%. The study results can guide the execution of design for new wells，and provide a basis for the formulation of water control measures for narrow banded reservoirs. 

Key words: narrow banded reservoir, pattern of water cut rise, main controlling factor, gray correlation analysis, stabilizing oil and controlling water