基于生产潜力的致密油藏井网形式优化研究

致密油藏具有低孔低渗、裂缝发育以及强非均质性等地质特征，因此致密油藏注采井网形式的优化设计显得尤为重要。本文改进了传统油藏生产潜力方法，得到了适合致密油藏开发的油藏生产潜力方法，并对改进型油藏生产潜力、传统油藏生产潜力及油藏储量丰度三种计算方法进行了对比分析，在基于生产潜力计算方法得到优势布井区域后，采用正交设计法，通过油藏数值模拟方法对五点法、反七点法、反九点法和平行井网的生产效果进行模拟预测，对天然裂缝展布方向与井网方位的关系进行研究，完成致密油藏井网形式的优选。结果表明：改进的生产潜力方法是可靠的，比原有的油藏生产潜力方法和储量丰度更能反映致密油藏不同地区的开发潜力, 可以作为致密油藏优势布井区域优选的依据。在致密油藏天然裂缝发育的情况下，采用五点法井网，将压裂水平井平行于天然裂缝布置，采出程度最高，见水时间最晚，含水率上升最慢，开发效果最好。

Study on optimization of well pattern form in tight reservoir based on production potential

Tight reservoir has the geological characteristics of low porosity and permeability, fracture development and strong heterogeneity. Therefore, the optimization design of injection production well pattern in tight reservoir is particularly important. In this paper, the traditional reservoir production potential method is improved, and the reservoir production potential method suitable for tight reservoir development is obtained, three calculation methods of production potential, original reservoir production potential and reservoir reserve abundance of improved reservoir are compared and analyzed. After the dominant well distribution area is obtained based on the production potential calculation method, the orthogonal design method is used to simulate and predict the production effect of five point method, inverse seven point method, inverse nine point method and parallel well pattern through reservoir numerical simulation method, so as to predict the distribution direction of natural fractures The relationship between well pattern orientation and well pattern orientation is studied to optimize the well pattern of tight reservoir. The results show that: the production potential of improved reservoir can reflect the development value of different areas of reservoir better than the production potential and reservoir reserve abundance of existing reservoir, and can be used as the basis for optimizing the dominant well distribution area of tight reservoir. Under the condition of natural fracture development in tight reservoir, the five point well pattern is adopted and the fractured horizontal well is arranged parallel to the natural fracture, the recovery degree is the highest, the water breakthrough time is the latest, the water cut rise is the slowest, and the development effect is the best.