低渗油藏考虑压敏后注采井间压力特征分析  

ANALYSIS ON PRESSURE CHARACTERISTICS BETWEEN INJECTOR AND PROCUCER IN LOW PERMEABILITY RESERVOIRS IN CONSIDERATION OF PERSSURE SENSITIVITY

作　　者：刘辉[1] 何顺利[1] 孟浪涛[2] 张涛[3] 张学军[3] 

机构地区：[1]中国石油大学石油工程教育部重点实验室,北京102249 [2]河南油田采油二厂,河南范县457532 [3]辽河石油勘探局井下作业公司,辽宁盘锦124000

出　　处：《大庆石油地质与开发》2009年第1期82-85,共4页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家“973”重点基础研究规划项目（2003CB214602）资助.

摘　　要：在低渗油藏开发中，由于压敏效应很明显，不能忽略它对压力分布的影响。因此，在变形介质不定常渗流微分方程的基础上，推导了压力场分布公式，并结合长庆低渗油藏实际生产情况，分析了压敏效应后注采井间压力分布特征。研究表明，考虑压敏效应后注采井间压降损失增大，造成注水压力利用效率降低；随着生产时间增加，压降损失幅度增大；注采井距和渗透率变异系数越大，近井周围压降损失越大。同时，注采井距过大，压敏效应后注采井间将难以建立有效驱替压力，因此在低渗油藏开发中应适当缩小井距。During development of low-permeability reservoirs, influence of pressure sensitivity on pressure distribution should not be ignored because of obvious pressure sensitivity effect. Thus, on the basis of differential equation of indeterminate constant percolation in deformable media, equation of pressure field distribution is derived, and characteristics of pressure distribution between injector and producer in consideration of pressure sensitivity is analyzed by combining actual production situation of low permeability reservoirs in Changqing. Study results show that pressure drawdown loss between injector and producer in consideration of pressure sensitivity increases, causing utilization rate of injection pressure to decrease; amplitude of pressure drawdown loss increases with increase of pro- duction duration. The larger the spacing between injector and producer and the variation coefficient of permeability are, the greater the pressure drawdown loss of near-well-bore area is. Meanwhile, if the spacing between injector and producer is oversized, it will be difficult to establish effective displacement pressure between injector and producer in consideration of pressure sensitivity. Thus the spacing should be reduced suitably during development of low - permeability reservoirs.

关 键 词：低渗油藏 压敏 压力特征 变异系数 

分 类 号：TE312[石油与天然气工程—油气田开发工程]