正交试验设计法在优化注聚参数研究中的应用

APPLICATION OF ORTHOGONAL Test DESIGN METHODOLOGY IN OPTIMAL PARAMETERS OF POLYMER FLOODING

注聚参数的选择是制定聚合物驱开发方案的关键环节,直接决定着聚合物驱开发的成败。根据矿场实践经验,确定了影响双河油田Ⅳ下层系聚合物驱开发效果的敏感因素。根据正交试验设计原理,考虑聚合物浓度、聚合物用量、注入速度、注采比四个因素,每个因素取三个水平,进行正交试验设计,以采收率增量、吨聚增油量和综合指标为评价指标,优化得到最优的注聚参数组合,以减少试验的次数,保证优化结果的科学性。在最优参数组合基础上,设计了不同段塞组合方式,确定了最佳段塞组合方式,为指导双河油田Ⅳ下层系聚合物驱开发提供了科学依据。

Optimal parameters of polymer flooding are the key in working out development plans, which determines the effects of polymer flooding. Sensitive parameters are presented which affect the effects of polymer flooding in the Ⅳ series of bottom strata of Shuanghe Oilfield. The sensitive parameters are density of polymer, amount of polymer slug, injecting rate and injection-production ratio respectively. Orthogonal test is carried out based on the principle of orthogonal design, involving the four factors and three corresponding levels. Optimal level of the parameters is achieved on the objectives of incremental recovery, cumulative production increment and integrative index. With the methodology, the numbers of tests has been greatly reduced while the scientific results ensured effectively. Then the optimal form of slug group is presented on the objectives of incremental recovery and net present value using reservoir numerical simulation method based on optimal level of the parameters above. These results will provide scientific support to the developing practice of the Ⅳ series of bottom strata of Shuanghe Oilfield.