火烧油层干式燃烧数值模拟及参数敏感性分析

利用数值模拟技术对室内燃烧管干式燃烧实验进行了拟合,研究了燃烧管内干式燃烧的动态变化特征,并且进行了参数敏感性分析。以辽河油田欢127块为例,初步设计了该块25-33井组的注气速度。结果表明,网格尺寸的选取应与燃烧带尺寸相当;增加燃烧反应的频率因子、降低活化能、增大注气速度,会加快燃烧反应,增加产液量;油藏初始温度对火烧油层驱油效果影响较大,而油藏初始压力则影响较小。初步设计25-33井组的注气速度为70 000 m3/d。

Numerical simulation and parameter sensitivity analysis of dry in-situ combustion

The experimental results of dry combustion in combustion tube was matched by numerical simulation method.The dynamic characteristics of dry combustion in combustion tube and the sensitivity of parameters were analyzed.Huan-127 block of Liaohe Oilfield was taken as an example to design air injection rate of 25-33 well group in this block.It is indicated that the block size of grid and size of combustion zone should be well-matched.The rate of combustion reaction and liquid production are increased with the increase of frequency factor of combustion,decrease of activity energy,and increase of air injection rate. The influence of initial temperature of reservoir is fairly important,and the initial pressure of reservoir is little important.The designed air injection rate of 25-33 well group in this block is 70?000 m~3/d.