苏北盆地帅垛复杂断块油田地质工程一体化高效开发实践

Practice of geology-engineering integration development of Shuaiduo Oilfield with complex fault in Subei Basin

苏北盆地帅垛油田戴南组一段油藏为中高渗复杂断块油藏,油藏驱动方式既有天然水驱也有人工水驱。投产后部分井初产高,含水上升速度快,注入水单向突进,层间吸水差异大,平面上部分注采井组无响应,层间和平面开发矛盾突出。针对不同断块和油层开发矛盾,引入地质工程一体化理念,加强基础地质研究,重新认识和落实主体构造,制定和实施加密调整方案,对高含水断块加强微构造和剩余油分布研究,完善注采井网;同时开展适合帅垛油藏的卡堵水和分层注水等一系列配套工艺技术研究应用。经过近几年的开发调整,实现了油田增产稳产,连续8年产量超过6×10^(4)t,平均年产油量8.8×10^(4)t,采油速度2.2%,平均含水上升率2.33%,水驱控制储量达366.2×10^(4)t,水驱控制程度86.7%,水驱动用储量363×10^(4)t,水驱动用程度86%。地质工程一体化理念在帅垛油田剩余油挖潜中的实践经验,对其他同类型油藏效益开发具有借鉴意义。

The reservoir of the Ed1 in Shuaiduo Oilfield in Subei Basin is a complex fault block reservoir with medium and high permeability.Both natural water and artifical water are used in the water flooding here.After put into production,some wells have high initial production,and rapid rise in water cut.The injected water bursts in one direction,and the difference in water absorption between layers is large.Some injection and production well groups on the plane have no response.The contradictions between the layers and the plane development are prominent.In view of the development contradictions of different fault blocks and oil layers,the concept of geology-engineering integration has been introduced to strengthen the basic geological research,reunderstand and implement the main structure,and then,formulate and implement intensification adjustment plans.The study of micro structure and remaining oil distribution is strengthened,and the injection-production well pattern is improved for the high water-cut fault blocks.At the same time,the research and application of a series of supporting technology such as water blocking and layered water injection suitable for Shuaiduo reservoir are also carried out.Due to the development and adjustment in recent years,the production of the oilfield keeps increasing and is stable.The annual output is above 6×10^(4)t for eight consecutive years,the average annual output is 8.8×10^(4)t,the oil recovery rate is 2.2%,the average water cut rise rate is 2.33%,the reserve controlled by water flooding reaches 366.2×10^(4)t,the degree of water drive control is 86.7%,the reserve for water drive is 363×10^(4)t,and the degree of water drive is 86%.The practical experience of the concept of geology-engineering integration in tapping the potential of remaining oil in the Shuiduo Oilfield has a good reference significance for other similar oil reservoirs.