摘要
注采井距是影响特低渗透油藏开发效果的关键,目前主要根据渗透率和启动压力梯度大小来确定。阐述了这种方法的局限性,根据物理模拟实验分析了启动压力梯度和应力敏感系数的变化规律,得到其数学描述形式,建立了特低渗透油藏非线性渗流数学模型。针对目前求解特低渗透油藏合理井距的局限性,基于修正后非线性稳定渗流数学模型和叠加原理,提出求解特低渗透油藏合理注采井距的新方法。该方法除能考虑储层渗透率、注采压差外,还可以考虑流体粘度、预期产量、启动压力梯度以及介质变形程度的影响,同时形成了合理注采井距优化理论图版,方便现场应用。
To ultra-low permeability reservoir,the key point of development effectiveness is producer-injector spacing,at the present,it is determined by means of permeability and threshold pressure gradient(TPG).In this paper,its restriction is illustrated,the change law of TPG and stress sensitivity factor analyzed according to physic simulation experiment,and its expression regressed with permeability as variable,at the same time,mathematical model of non-linear flow in porous media built.A new method for determing reasonable well spacing in ultra-low permeability reservoir is presented based on the model and superposition theory.A new methord is presented to extract reasonable injector-producer spacing in ultra-low permeability reservoir,by this method,not only reservoir permeability and injection-production pressure difference can be considered,but also fluid viscosity,expected production,TPG and stress sensitivity.Finally,relevant theory chart board is convenient for field application.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2008年第5期93-96,共4页
Journal of Southwest Petroleum University(Science & Technology Edition)
基金
国家自然科学基金(90210019)
教育部高等学校博士学科点专项科研基金(20060425001)
关键词
低渗透
注采井距
期望产能
启动压力梯度
应力敏感
ultra-low permeability
producer-injector spacing
expected productivity
threshold pressure gradient
stress sensitivity
