低(特低)渗透油藏油井产能预测新方法探索  

NEW PREDICTION METHOD OF OIL WELL PRODUCTIVITY IN LOW(ULTRA-LOW) PERMEABILITY RESERVOIR

作　　者：陈家晓[1] 黄全华[2] 

机构地区：[1]西南油气田分公司采气工艺研究院 [2]西南石油大学

出　　处：《钻采工艺》2009年第2期44-46,115,共3页Drilling & Production Technology

摘　　要：低(特低)渗透油田存在启动压力梯度,渗流呈"非线性"特征。国内外许多实验表明,当储层渗透率低到一定程度后,其渗流特征不符合达西定律,即当驱动压力梯度较小时,流体不能流动,只有当驱动压力梯度达到一定值后,流体才开始流动。而低(特低)渗透油藏具有低孔、低渗的特点,因此具有很高的启动压力梯度。目前在对低(特低)渗透的产量预测时,启动压力梯度一般被忽略,导致预测结果和实际的生产情况存在较大的误差。通过大量文献调研,确认低(特低)渗透油藏确实存在启动压力梯度,并且是产量预测中不可缺少的因素。为此,文章基于低渗透油藏的渗流机理的分析和研究,同时考虑启动压力梯度的影响,推导出适合低渗透油藏的油井产量预测公式新方法。Starting pressure gradient exists in low(ultra-low) permeability oilfield,and has the feature of the nonlinearity percolation.Many domestic and foreign experiments show that when the seepage rate of low permeability reservoir is low to a certain degree,its flow characteristics are incompatible with Darcy's law,that is,when the driving pressure gradient is low,fluid can not flow,when the driving pressure gradient is high up to a certain value,fluid flow begin.Low(ultra-low) permeability reservoirs have the features of low porosity and low permeability,its starting pressure gradient is very high.Currently,when predicting the productivity of low(ultra-low) reservoir,starting pressure gradient is generally ignored,resulting in a big error existent in between the prediction results and the actual situation of production.Through extensive literature research,the starting pressure gradient of low(ultra-low) permeability reservoir in production forecast is an indispensable factor.Therefore,based on the percolation mechanism of low permeability reservoir,and taking into account the impact of starting pressure gradient,the prediction formula of oil well productivity in low permeability reservoir was derived.

关 键 词：低渗油藏 渗流 非线性 产能预测 

分 类 号：TE328[石油与天然气工程—油气田开发工程]