一种基于动态储量分级的致密砂岩油藏合理井距确定方法

长庆华庆地区超低渗透油藏目前开发难度逐渐加大,合理的井网井距一直难以确定。本文根据选定区域开发动态及渗流特征,分析应用水驱特征曲线法、产量不稳定分析法确定其计算动态储量的适用性,结合实际的动静态资料,进行了动态地质储量的计算;然后通过计算单井的动静储量比,给出了动态地质储量的分级指标。通过储量动态分级,从而建立了动态储量与井排距之间的关系,在确定单井动态储量的情况下为设计出合理的井距奠定了基础。通过实例分析表明,该方法计算简单、实用,为油井的合理井距设计提供依据,对超低渗透油藏的开发具有重要意义。

Research on Calculating Reasonable Well Spacing Based on Classification of Dynamic Reserve in tight sand stones reservoirs

the difficulty of developing the ultra-low permeability reservoir is increasing, rational spacing between wells is always very difficult to determine. According to development performance and seepage characteristic, this paper determines adaptability of dynamic reverse calculated by analyzing and applying water-drive curve and Rate Transient Analysis method, calculating dynamic geological reserve; then through calculating single well ratio of dynamic reserve to static reserve, we introduce a classification criterion of dynamic geological reserve. By researching dynamic classification of reserve, we establish the relationship of dynamic reserve and well spacing, laying the foundation for designing rational well spacing in the event of having determined dynamic reserve of single well. Some cases prove that this method is very simple, practical. It can provide basic for rational well spacing and is of great significance for developing ultra-low permeability reserve.