井网控制程度对气藏采收率影响

采收率影响因素众多,井网控制程度是主要因素之一。目前井网控制程度对采收率影响研究较少,尚缺乏规律性认识。以靖边气田A井区为例,提出了一种井网控制程度的计算方法—泄流面积法。应用该方法计算了小层井网控制程度,研究了井网控制程度对采收率影响规律。结果表明,靖边气田井网控制程度差异很大,在3.2%-81.1%之间；现有井网对马五13较为适应(马五13井网控制程度81.1%),而对其它小层控制程度低、适应性差；井网控制程度与采收率呈线性正相关规律,井网控制程度每增加10%、采收率提高8.5%。该认识具有实际意义,为掌握靖边气田储层开发特征、改进气田开发方式提供了依据。

Effect of Well Pattern Control Level on Gas Reservoir Recovery

There are many factors affecting recovery factor, and the well pattern control level is one of the main factors. At present, there are few studies on the effect of well pattern control level on recovery factor, and there is still no regular understanding. A calculation method of well pattern control level is put forward: drainage area method. Taking Jingbian gas field A area as an example, the well pattern control level of small layer is calculated by this method, and the effect of well pattern control level on recovery factor is quantitatively studied. The results show that the well pattern control level in Jingbian gas field is very different, the control level in Ma531 is the lowest, only 3.2 %, and in Ma513 is the highest, reaching 81.1 %; The existing well pattern is more adaptable to the main formation Ma513, but has low control level and poor adaptability to other secondary formations; The correlation analysis shows that the control level of well pattern and recovery factor are in line with the linear positive correlation rule, and the recovery factor is increased by 8.5% for every 10% increase of well pattern control level. Under the condition that the prospect of stable production in the gas field is not optimistic, this understanding provides an important basis for mastering the development characteristics of Jingbian gas field reservoir and improving the development mode of the gas field.