摘要
针对致密砂岩气藏多段压裂水平井的实测试井曲线与理论曲线在流态特征及曲线形态方面存在一定差异的问题,建立多段压裂水平井渗流模型,绘制试井理论曲线图版,分析裂缝参数对试井曲线的影响,并基于矿场实例分析天府气田沙溪庙组致密气藏多段压裂水平井试井曲线特征。研究表明:与传统压裂水平井试井曲线相比,多段压裂水平井试井曲线早期裂缝双线性流或线性流阶段被井筒储集效应和表皮效应所掩盖,中期仅表现出径向流阶段特征,后期过渡进入地层线性流阶段;裂缝半长越大、缝网越复杂,中期径向流阶段与地层线性流阶段差异越明显。天府气田沙溪庙组致密气藏多段压裂水平井受近井区复杂缝网和河道边界影响,流态可划分为井筒储集表皮效应反映、径向流、地层线性流、边界反映4个阶段。该研究可为致密砂岩气藏多段压裂水平井精准试井分析提供新思路。
In response to the issue that there are certain differences in flow regime characteristics and curve morphology between the actual well test curves and theoretical curves of multi-stage fractured horizontal wells in tight sandstone gas reservoirs,a seepage model for multi-stage fractured horizontal wells was established.Theoretical well test curve charts were drawn to analyze the impact of fracture parameters on well test curves.Based on mine field examples,the characteristics of well test curves of multi-stage fractured horizontal wells in the tight gas reservoir of the Shaximiao Formation in the Tianfu Gasfield were analyzed.The study shows that Compared with the well test curves of traditional fractured horizontal wells,the early fracture bilinear or linear flow stage of multi-stage fractured horizontal wells is masked by the wellbore storage effect and skin effect.In the middle stage,only the characteristics of the radial flow stage are exhibited,and in the later stage,it transitions into the formation linear flow stage.The larger the fracture half-length and the more complex the fracture network,the more obvious the difference between the middle radial flow stage and the formation linear flow stage.The multi-stage fractured horizontal wells in the tight gas reservoir of the Shaximiao Formation in the Tianfu Gasfield are affected by the complex fracture network near the wellbore and the river channel boundaries.The flow regime can be divided into four stages:wellbore storage and skin reflection,radial flow,formation linear flow,and boundary reflection.This study provides a new approach for precise well test analysis of multi-stage fractured horizontal wells in tight sandstone gas reservoirs.
作者
王会强
李明秋
曹正林
邓清源
于鹏
时尔翰
WANG Huiqiang;LI Mingqiu;CAO Zhenglin;DENG Qingyuan;YU Peng;SHI Erhan(PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610051,China)
出处
《特种油气藏》
北大核心
2025年第2期73-81,共9页
Special Oil & Gas Reservoirs
基金
中国石油重大科技专项“致密砂岩气藏提高采收率关键技术研究”(2023ZZ25)。
关键词
致密气藏
砂岩
多段压裂水平井
微裂缝
试井曲线特征
沙溪庙组
天府气田
tight gas reservoir
sandstone
multi-stage fractured horizontal well
micro-fracture
well test curve characteristics
Shaximiao Formation
Tianfu Gasfield
