It is difficult to build an effective water flooding displacement pressure system in the middle section of a horizontal well in an ultra-low permeability sandstone reservoir. To solve this problem, this study proposes to use packers, sealing cannula and other tools in the same horizontal well to inject water in some fractures and produce oil from other fractures. This new energy supplement method forms a segmental synchronous injection-production system in a horizontal well. The method can reduce the distance between the injection end and the production end, and quickly establish an effective displacement system. Changing the displacement between wells to displacement between horizontal well sections, and point water flooding to linear uniform water flooding, the method can enhance water sweeping volume and shorten waterflooding response period. The research shows that: (1) In the synchronous injection and production of horizontal well in an ultra-low-permeability sandstone reservoir, the water injection section should select the section where the natural fractures and artificial fractures are in the same direction or the section with no natural fractures, and the space between two sections should be 60–80 m. (2) In addition to controlling injection pressure, periodic water injection can be taken to reduce the risk of re-opening and growth of natural fractures or formation fracture caused by the gradual increase of water injection pressure with water injection going on. (3) Field tests have verified that this method can effectively improve the output of single well and achieve good economic benefits, so it can be widely used in the development of ultra-low permeability sandstone reservoirs.

在超低渗透性砂岩油藏的水平井中段很难建立有效的注水驱替压力系统。为了解决这个问题，本研究建议在同一水平井中使用封隔器，密封套管和其他工具，以在某些裂缝中注水并从其他裂缝中采油。这种新的能量补充方法在水平井中形成了分段同步注入生产系统。该方法可以减小注射端与生产端之间的距离，并快速建立有效的排量系统。将井间位移改为水平井段间位移，将点注水改为线性均匀注水，可以增加注水量，缩短注水响应时间。研究表明：（1）在超低渗砂岩油藏同步注水和水平井生产中，注水段应选择天然裂缝与人工裂缝方向相同的段或该段。没有自然裂缝，两段之间的距离应为60–80 m。（2）除了控制注入压力外，还可以采取定期注水的方法，以减少因注水持续进行而逐渐增加注水压力而引起的自然裂缝或地层裂缝重新张开和生长的风险。（3）现场试验证明，该方法可有效提高单井产量，取得良好的经济效益，