聚合物驱压裂井油水两相渗流不稳定压力分析方法
汪洋(1992-),男,安徽六安人,博士,中国石油大学(北京)石油工程学院副教授,主要从事非常规油气藏开发方面的教学和科研工作。地址:北京市昌平区府学路18号,中国石油大学(北京)石油工程学院,邮政编码:102249。E-mail: petroyang@163.com |
收稿日期: 2022-05-11
修回日期: 2022-12-21
网络出版日期: 2023-01-12
基金资助
国家自然科学基金(52104049)
中央高校基本科研业务费专项资金(2462022BJRC004)
Transient pressure analysis of polymer flooding fractured wells with oil-water two-phase flow
Received date: 2022-05-11
Revised date: 2022-12-21
Online published: 2023-01-12
基于两相渗流理论,考虑聚合物的剪切变稀、剪切增稠、对流、扩散、吸附滞留、不可及孔隙体积和有效渗透率下降的综合影响,建立了聚合物驱压裂井油水两相渗流不稳定压力分析模型。采用有限体积差分和牛顿迭代方法对模型进行求解,分析了裂缝导流系数、注入聚合物质量浓度、地层初始聚合物质量浓度和含水饱和度对压裂井试井典型曲线的影响规律。结果表明:裂缝导流系数增加,压力传导加快,压降减小,过渡流段压力曲线下移,双线性流段的持续时间更短,线性流段出现更早,且线性流持续时间更长。注入聚合物质量浓度增加,水相有效黏度增大,压力传播损耗增加,压力和压力导数上移,双线性流段缩短。地层初始聚合物质量浓度增加,水相有效黏度增加,井筒储集段后的压力曲线整体上移。地层含水饱和度增加,水相相对渗透率变大,油相相对渗透率减小,油水两相总流度增加,压力传播损耗减小,井筒储集段后的压力曲线整体下移。模型退化后计算结果和商业试井软件计算结果对比及实测试井资料验证了新模型的可靠性、实用性。
汪洋 , 于海洋 , 张佳 , 冯乃超 , 程时清 . 聚合物驱压裂井油水两相渗流不稳定压力分析方法[J]. 石油勘探与开发, 2023 , 50(1) : 160 -166 . DOI: 10.11698/PED.20220341
The oil-water two-phase flow pressure-transient analysis model for polymer flooding fractured well is established by considering the comprehensive effects of polymer shear thinning, shear thickening, convection, diffusion, adsorption retention, inaccessible pore volume and effective permeability reduction. The finite volume difference and Newton iteration methods are applied to solve the model, and the effects of fracture conductivity coefficient, injected polymer mass concentration, initial polymer mass concentration and water saturation on the well-test type curves of polymer flooding fractured wells are discussed. The results show that with the increase of fracture conductivity coefficient, the pressure conduction becomes faster and the pressure drop becomes smaller, so the pressure curve of transitional flow goes downward, the duration of bilinear flow becomes shorter, and the linear flow appears earlier and lasts longer. As the injected polymer mass concentration increases, the effective water phase viscosity increases, and the pressure loss increases, so the pressure and pressure derivative curves go upward, and the bilinear flow segment becomes shorter. As the initial polymer mass concentration increases, the effective water phase viscosity increases, so the pressure curve after the wellbore storage segment moves upward as a whole. As the water saturation increases, the relative permeability of water increases, the relative permeability of oil decreases, the total oil-water two-phase mobility becomes larger, and the pressure loss is reduced, so the pressure curve after the wellbore storage segment moves downward as a whole. The reliability and practicability of this new model are verified by the comparison of the results from simplified model and commercial well test software, and the actual well test data.
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