摘要
低渗气藏由于储层具有低孔低渗的特征,气井产能普遍较低,而气井产水则严重影响了气井产能的发挥,从而加大了气藏开发的难度。基于平面径向渗流原理,定义气水两相拟压力以及气水两相启动压力梯度,考虑启动压力梯度、应力敏感、滑脱效应、表皮效应及紊流效应对产能的影响,推导出了低渗气藏气水同产井三项式产能公式。实例分析表明气井产水将会降低气相驱动动力,使气井无阻流量降低43.58%。
The characteristics of low porosity and low permeability in gas reservoir will lead to low productivity of gas well,so it is of great development difficulty. Based on the theory of radial seepage in gas reservoir,the author defined the pseudo- pressure and start- up pressure gradient of gas- water two phase,considering influence of stress sensitivity,slippage effect,skin effect and turbulence effect on productivity,and tried to deduce the trinomial productivity formula of gas- water well in low- permeability gas reservoir. Case study shows gas well producing water will cut down the reservoir drive energy,and eventually influence the absolute open flow of gas well,which has been reduced by 43. 58%.
出处
《重庆科技学院学报（自然科学版）》
CAS
2015年第1期6-8,43,共4页
Journal of Chongqing University of Science and Technology：Natural Sciences Edition
基金
国家科技重大专项(2009E-0307)
西南石油大学创新基金项目(GIFSS1122)
关键词
低渗气藏
产水
启动压力梯度
应力敏感
滑脱效应
无阻流量
low-permeability
water producing
start-up pressure gradient
stress sensitivity
slippage effect
absolute open flow
