低渗透油藏污染井污染前后的产能预测新模型  

A New Model of Productivity Prediction for Low-Permeability Reservoirs Before and After Damage

作　　者：何勇明[1,2] 樊中海[3] 孙尚如[3] 徐丽丽[4] 

机构地区：[1]中国石化河南油田分公司博士后科研工作站,河南南阳473132 [2]成都理工大学博士后科研流动站,四川成都610059 [3]中国石化河南油田分公司,河南南阳473132 [4]中国石油大港油田公司审计中心,天津大港300280

出　　处：《石油钻探技术》2009年第4期93-95,共3页Petroleum Drilling Techniques

摘　　要：考虑低渗油藏污染区内外启动压力梯度不同的特性,推导出了低孔低渗油藏污染井污染前后的产能预测新模型,分析了低渗油藏启动压力梯度对产能预测模型的影响,以及污染井污染前后不同启动压力梯度对产能预测的影响。计算实例表明,考虑污染区启动压力梯度变化后所预测的产能比只考虑污染导致渗透率变化时所预测的产能要小。这说明在进行产能预测时,只考虑污染所引起的渗透率伤害是远远不够的,还需要考虑由此引起的启动压力梯度的变化,才能更准确地预测产能,并为准确评价低渗油藏污染井的压裂酸化增产效果提供理论依据。Considering the different starting pressure gradients inside and outside the damaged region in low permeability reservoir, a new model is derived to predict productivity of low porosity and low permeability reservoirs before and after damage. The impact of parameters on reservoir productivity was analyzed, including starting pressure gradient, and the different starting pressure gradients in the damaged region before and after damage. Results show that productivity is smaller considering also the change of the starting pressure gradient compared with only considering the change of the permeability in damaged area. Therefore it indicates that only considering permeability change caused by damage is not enough, and the change of the starting pressure gradient should be considered in order to better predict the productivity. It can also provide guidance for evaluating the results of acidizing damaged wells.

关 键 词：低渗透油气藏 产能预测 启动压力 储集层 数学模型 

分 类 号：TE348[石油与天然气工程—油气田开发工程]