石油钻采工艺Issue(4)：67-71,5.DOI:10.13639/j.odpt.2015.04.018
低渗气藏特殊渗流机理及稳定产能预测方法
Research on special seepage mechanism and prediction method for stable productivity of low permeability gas pools
摘要
Abstract
The low permeability gas pools, different from conventional gas reservoirs, are characterized by poor reservoir physical properties and high water saturation, thus its seepage mechanism is even more complex. This paper sets forth in detail the special seepage mechanism of low permeability gas pools based on low permeability reservoirs. Meanwhile, in line with inadequate consideration factors for productivity forecast of low permeability gas pools and inaccuracy of the result of productivity assessment, this paper inferred a general equation for prediction of stable gas productivity, according to gas pool productivity equation under stable seepage conditions and activating pressure gradient model, and taking into full consideration the gas slippage effect and multiple non-linear effects like low-rate non-darcy effect, high-rate non-darcy effect, pressure sensitivity effect, in combination with seepage mechanic fundamentals. The result shows that the low-rate non-darcy effect, high-rate non-darcy effect and pressure sensitivity effect of low permeability gas pool all cause the gas pool productivity to become smaller. If these effects were neglected, then optimistic assessment would be made on productivity. Among which, the activating pressure gradient and pressure sensitivity coefifcient (particularly the anomalous high pressure reservoir) have a signiifcant effect on gas well productivity. The slippage factor plays a second role, and the high-rate non-darcy effect has the least effect. The examples conifrmed the correctness of the productivity model, which can be used for actual ifeld development work.关键词
低渗气藏/渗流机理/滑脱效应/低速非达西/高速非达西/压敏效应Key words
low permeability gas pool/seepage mechanism/slippage effect/low-rate non-darcy/high-rate non-darcy/pressure sensitivity effect分类
能源科技引用本文复制引用
姜瑞忠,韩光伟,汪洋,徐攀登..低渗气藏特殊渗流机理及稳定产能预测方法[J].石油钻采工艺,2015,(4):67-71,5.基金项目
国家自然科学基金“页岩气藏多级压裂水平井流动特征及产能评价方法研究”（编号51374227）；国家科技重大专项“大型油气田及煤层气开发”子课题“特低渗油藏有效开发技术”（编号2011ZX05051005-006）。 （）
