摘要
针对低渗气藏压裂后形成水平裂缝,基于稳定流理论,推导建立了气井压裂后产生水平裂缝条件下,考虑启动压力梯度、滑脱效应和应力敏感共同影响的低渗气藏无限导流水平裂缝井产能预测模型。通过实例分析各因素对产能特征的影响。研究结果表明:启动压力梯度对气井产能的影响呈近似线性下降趋势,应力敏感对气井产能的影响呈"凹型"下降趋势,而滑脱效应对气井产能的影响呈近似线性上升趋势;在高流压阶段,启动压力梯度对气井产能影响显著,而在低流压阶段,对气井产能影响更大。
In view of horizontal fractures formed after fracturing of low - permeability gas reservoir, based on the steady seepage theory, a productivity prediction model for horizontal fracture wells after fracturing was established by considering influences of start - up pressure gradient, slippage effect and stress sensitivity in the low - permeability oil reservoirs. Productivity characteristic was discussed by analyzing and calculating examples. The research results show that the gas well productivity decreases with start - up pressure gradient by near linear relationship, decreases with stress sensitivity by ＂concave type＂ curve relationship, and increases with slippage effect by near linear relationship. In the high flowing pressure stage, the influence of stare - up pressure gradient on gas well productivity is notable. But, the influence is more serious in the low flowing pressure stage.
出处
《复杂油气藏》
2013年第1期58-61,共4页
Complex Hydrocarbon Reservoirs
基金
西南石油大学研究生创新基金项目(编号:GIFSS0701)
关键词
低渗气藏
水平裂缝
启动压力梯度
滑脱效应
应力敏感
产能分析
low permeable gas reservoir
horizontal fracture
start - up pressure gradient
slippage effect
stress sensitivity
productivity analysis
