摘要
针对致密气藏压裂后产能预测难的问题,基于渗流机理,考虑地层的应力敏感及压裂后的地层改善效果,建立适用于压裂停泵反演的线性非均质复合区压裂井模型,利用建立的模型和数值试井确定裂缝参数和地层参数,应用SPSS回归方法建立了压裂前后产能与压裂规模的关系,得到致密气藏压裂后的产能预测方法。研究表明:水力压裂停泵后闷井压力的双对数特征曲线可分为裂缝线性流阶段、过渡段、窜流阶段、外区线性流阶段、边界效应阶段;新建立的产能预测方法应用于榆林气田X井区,产能预测的平均误差为16.1%,具有较好的适用性;不同压裂参数对产能的影响由大到小依次为排量、加砂量、压裂液量;压裂最优排量为3.36~4.83 m^(3)/min,最优加砂量为56.95~77.66 m^(3),最优压裂液量为167.09~259.91 m^(3)。研究结果对优化致密气藏的压裂设计及压裂后产能预测具有一定的指导意义。
To solve the problem of difficultly predicting the productivity for tight gas reservoirs after fracturing,based on the seepage mechanism and considering the stress sensitivity of the formation and the effect of formation improvement after fracturing,a linear heterogeneous composite zone fractured well model applicable to the inversion of fracture pump-stop is established,the fracture parameters and formation parameters are determined by using the established model and numerical well tests,and the relationship between productivity and fracture scale before and after fracturing is established by applying SPSS regression method,to obtain the The relationship between productivity and fracture scale before and after fracturing was established by applying SPSS regression method,to obtain the productivity prediction method for tight gas reservoirs after fracturing.The study shows that the double logarithmic characteristic curves of shut-in pressure change after hydraulic fracture pump-stop can be divided into fracture linear flow stage,transition stage,interfacial flow stage,outer zone linear flow stage and boundary effect stage;the newly established productivity prediction method is applied to Well Block X in Yulin Gas Field,with the average error of productivity prediction of 16.1%and good applicability;the effects of different fracturing parameters on productivity are,in descending order,discharge volume,sand addition volume,and fracturing fluid volume,with the optimal fracturing discharge volume of 3.36-4.83 m^(3)/min,the optimal sand addition volume of 56.95-77.66 m^(3),and the optimal fracturing fluid volume of 167.09-259.91 m^(3).The study results have certain guidance for optimizing the fracturing design and post-fracturing productivity prediction of tight gas reservoirs.
作者
王涛
于海洋
赵鹏飞
李敬松
刘汝敏
寇双燕
王敬
廖爽
Wang Tao;Yu Haiyang;Zhao Pengfei;Li Jingsong;Liu Rumin;Kou Shuangyan;Wang Jing;Liao Shuang(State Key Laboratory of Oil and Gas Resources and Exploration of China University of Petroleum(Beijing),Beijing 102249,China;China Oilfield Services Limited,Tianjin 300450,China)
出处
《特种油气藏》
CAS
CSCD
北大核心
2023年第4期122-130,共9页
Special Oil & Gas Reservoirs
基金
国家自然科学基金“页岩油注天然气开发油气两相渗流微尺度效应及增油机理”(52074317)。
关键词
致密气藏
停泵反演
解析模型
数值试井
产能评估
tight gas reservoir
pump-stop inversion
analytical model
numerical well test
production evaluation
