水平井注采井网和注采参数优化研究

Optimization of horizontal injection-production well pattern and parameter

水平井注采井网开发低渗透、薄层油藏可以增大注水量、降低注水压力、有效保持地层压力、提高油藏的采出程度。结合M油田油藏地质特征,应用数值模拟和经济评价方法对该油田的水平井注采井网类型、方向、排距以及转注时机与注采比等开发指标进行优化,达到经济、高效地开发目的。结果表明,水平井注采结构采用完全正对排状井网可获得较好的开发效果,优化后的井距为100 m,水平井与最大主渗方向呈45°夹角,注采井排距为300 m,地层压力水平在85%以上时注水保压,推荐注采比为1.0。研究方法和研究结果可为同类型油藏水平井注采井网部署提供参考依据,具有很好的借鉴意义。

Using the horizontal wells to develop low permeability and thin layer reservoir can increase the injection rate, reduce the injection pressure, maintain the reservoir pressure effectively and improve the recovery factor of reservoir. Take M oilfield as an example and based on the study of reservoir geological characteristics, with the numerical simulation method and economic evaluation principle to optimize the injection-production pattern type,direction, row spacing and the turn time of water-injection and injection-production ratio and to achieve the purpose of economic and high efficient development. It turns out that, the pipe-shaped well pattern is best, the optimized well spacing is 100 m, the angle is 45° between horizontal wells and the maximum principal direction of permeability, the row spacing is 300 m, the reservoir pressure level shouldn＇t be less than 85 % when water is injected,and the recommended injection-production ratio is 1.0. The study provides reliable theoretical basis for horizontal well injection-production pattern for similar reservoirs, and has very good reference significance.