东北石油大学学报2025，Vol.49Issue(3)：105-114,10.DOI:10.3969/j.issn.2095-4107.2025.03.009
基于一维时间扩散飞行方法的非均质裂缝性砂岩气藏试井模型
Well test model for heterogeneous fractured tight sandstone gas reservoirs based on the one-dimensional dif-fusive time of flight method
摘要
Abstract
After acid fracturing in heterogeneous fractured sandstone reservoirs,strip-shaped fracture zones may form around the wellbore.To accurately characterize the production dynamics of heterogene-ous fractured sandstone gas reservoirs,a mathematical model based on the one-dimensional diffusive time of flight(1D-DTOF)method was established.The model was solved using Laplace transform,Du-hamel's principle,and Stehfest numerical inversion techniques to derive an analytical solution for bot-tomhole flowing pressure responses,generating transient pressure response curves.The flow stages were classified based on curve characteristics,and sensitivity analyses of influencing factors were con-ducted.The results indicate that the seepage process in heterogeneous fractured wells can be divided into five typical flow stages.A higher fracture network density leads to earlier occurrence of fluid channeling and deeper depressions in the pressure derivative curves during the channeling stage.Increased permea-bility in the near-well zone prolongs the duration of the linear flow stage.Higher porosity in the far-well zone delays the onset of boundary-dominated flow.Greater porosity contrast in the near-well region sig-nificantly impacts the channeling stage,while higher porosity contrast in the far-well region notably af-fects the boundary-dominated flow stage.Field applications validated the effectiveness and reliability of this well testing model,providing technical support for addressing strip-shaped fracture zone challenges in acid-fractured heterogeneous sandstone gas reservoirs.关键词
酸化压裂/裂缝性气藏/非均质性/一维时间扩散飞行/试井模型/裂缝网络Key words
acid fracturing/fractured gas reservoirs/heterogeneity/one-dimensional diffusive time of flight(1D-DTOF)/well testing model/fracture network分类
能源科技引用本文复制引用
周文卓,蔡寒幸,杜雅雯,滕柏路..基于一维时间扩散飞行方法的非均质裂缝性砂岩气藏试井模型[J].东北石油大学学报,2025,49(3):105-114,10.基金项目
国家自然科学基金项目(52104043) （52104043）
