Study on Water Injection Adjustment Method of Horizontal Well with Low Permeability Thin Oil Layer

Since 2002, a certain oilfield has carried out horizontal well development experiments, and the well network in the horizontal well area adopts the seven-point parallel well network water injection development, and the output of a single well in the initial stage of production is more than three times that of the surrounding straight wells, which promotes the effective utilization of the difficult-to-recover reserves in the thin oil layer. However, due to the long horizontal section of horizontal wells, the reservoir development, injection and production connection, and water injection efficiency of each drilling section are different, and the utilization of horizontal wells in sections is quite different, the contradiction between layers and planes is increasingly prominent, and the production decreases, the number of water-cut rising wells increases. Therefore, the adjustment method of layered water injection in the horizontal well has become an important topic in the development of horizontal wells. In order to solve this problem, this paper takes the horizontal well area of a low-permeability thin oilfield as an example, comprehensively applies the dynamic analysis method, studies the water injection adjustment method of the horizontal well area by type and stage, clarifies the idea of water injection adjustment in the horizontal well area of “two separating, three combining and one considering”, optimizes the cyclical water injection mode of single-well one-way layered cycle and multi-well multi-way inter-well cycle of horizontal wells in the high water-cut stage, and effectively slows down the rise of water cut in horizontal wells. In 2022, a total of 88 wells were tracked and adjusted in the whole region, and the decline in production of untargeted oil wells was controlled, and the upward trend of water cut slowed down, which effectively improved the development effect of horizontal wells. Provide guidance for the adjustment of water injection in the later stage of similar horizontal well areas.