改善复杂河流相稠油油田水驱开发效果对策

复杂河流相油田由于先天地质条件复杂,砂体连通性难以把握,同时海上开发这类油田仍以大井距多层合采为主,加剧了注采间矛盾。以渤海B油田为例,通过油藏工程方法评价油田注水开发存在的问题,然后选取典型井组通过油藏数值模拟方法,开展注水井排液时间及合理转注时机、合理注采比、合理油水井数比等方面优化工作,提出该类油田设计注水井排液1~2年后应适时转注,合理注采比应保持在0.9左右,油水井数比保持在1.4左右,同时应优化注采井网,考虑在物性较差的河道边部部署注水井,在物性较好的河道中部部署采油井,提高注入水利用效率改善水驱开发效果。

Countermeasures for Improving Water-flooding Development Effect of Complex Fluvial Facies Reservoirs

The sand body connectivity of the complex fluvial facies oil reservoir is difficult to grasp due to the complex geological conditions, on the other hand the major development strategy of the offshore reservoir is wide well spacing and commingling production that can exacerbate the injection and production contradiction. In this paper, taking Bohai B reservoir as an example, the problems during water-flood development were analyzed by reservoir engineering method, then typical well group was selected to carry out the optimization of drainage time of the injecting well, reasonable injection timing, reasonable injection production ratio and reasonable oil and water well ratio through reservoir numerical simulation, then it's pointed out that the drainage time is 1~2 years, reasonable injection production ratio is 0.9,oil and water well ratio is 1.4.At the same time the well pattern should be optimized, injection well should be deployed on the channel side with poor property, and production well should be deployed on the channel with good physical property to improve the water-flooding development effect.