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枣园油田枣南孔一段油藏主要含油层位为孔一段的枣IV、V油组,油层平均有效厚度为58.3 m/19层;断块内有17条断层,划分为9个断块区,平均断块面积为0.19 km2。油层连通差,储层物性变化大,平面上注水井吸水状况不均衡,位于构造边部的采油井见不到注水效果,表现为低能低产,剩余油的潜力无法动用。通过室内驱替实验和理论公式计算得出,枣南孔一段油藏构造边部相对低渗区的合理井距为75 m;应用概率公式法、经验公式法及采收率-井网密度关系,计算平均井距75 m时井网水驱控制程度分别达到88.5%和89.6%,可提高最终采收率2.12%。超小井距注水首先在3个井组进行先导性试验,累计增油1 337 t,然后又在5个井组进行推广,受益油井产油量由39.1 t·d-1上升到54.7 t·d-1,增油15.6 t·d-1,累计增油2 172 t,预测油藏最终采收率从30.2%提高到31.3%。
The main oil reservoirs in the first member of the Zaoyan oilfield in Zaoyuan Oilfield are Jura IV and V oil reservoirs with a pore-average interval of 58.3 m / 19. The fault has 17 faults within it and is divided into 9 fault blocks , The average block area of 0.19 km2. Poor reservoir connectivity, large changes in reservoir properties, imbalanced water injection wells in the plane, and no oil injection effect in the production wells located on the margins of the tectonic formation. The result is low-energy and low-yielding and the potential for remaining oil can not be used. Based on the experiment of indoor displacement and the theoretical formula, the reasonable well spacing of the relatively low permeability zone of the first member of Konganan Member in the southern margin of Zaonan is 75 m. Probability formula, empirical formula method and recovery rate-well pattern density . When the average well spacing is 75 m, the control efficiency of well pattern water drive reaches 88.5% and 89.6% respectively, which can increase the final recovery rate by 2.12%. Ultra-small well waterflooding was conducted first in three well groups for pilot tests, with a total increase of 1 337 t and then in 5 well groups to promote the production of oil wells from 39.1 t · d-1 to 54.7 t · d -1, increasing oil 15.6 t · d-1, increasing oil totaling 2 172 t. It is predicted that the ultimate oil recovery will increase from 30.2% to 31.3%.