摘要
针对致密砂岩气井缺乏合适的产能评价指标的问题,提出一种新的产能评价指标——IC指数。运用格林函数与纽曼乘积方法,利用摄动方法消除了应力敏感系数带来的非线性,采用裂缝微元理论对模型进行求解并利用理论模型对IC指数的主控因素进行了分析。研究表明,IC指数曲线特征明显,可以有效区分常规储层和非常规储层。以苏里格致密气田苏6井区为例,计算了Ⅰ、Ⅱ、Ⅲ类井的IC曲线,与理论曲线相比特征比较吻合。该成果为致密砂岩气井的产能评价提供了借鉴。
Considering that no proper productivity indicator is available for tight sandstone gas well,a new indicator- IC index has been proposed. With Green function and Neumann algorithm,nonlinearity induced by stress sensitivity coefficient is eliminated by the perturbation method,and then major factors controlling IC index are analyzed with the theoretical model which is solved according to the fracture infinitesimal theory. The results show that IC index presents clear curve characteristics,which can be used to effectively distinguish conventional reservoir and unconventional reservoir. Taking Su6 wellblock in Sulige tight gas field as example,IC curves are calculated for Type I,II and III wells,showing identical features to theoretical curves. This study can provide reference for productivity evaluation of tight sandstone gas wells.
出处
《特种油气藏》
CAS
CSCD
北大核心
2014年第6期97-100,146,共4页
Special Oil & Gas Reservoirs
基金
国家重大科技专项"大型油气田及煤层气开发"(2011ZX05016)
国家自然科学基金"超低渗透油藏注气提高采收率理论与技术研究"(U1262101)
关键词
致密砂岩气井
产能指数
IC指数
理论模型
影响因素
tight sandstone gas well
productivity indicator
IC index
theoretical model
influential factor
