K油田渗透率变异系数对产能影响研究与实践

Characterization and Application of the Effect of Formation Stress on Permeability in High Saturated Pressure Differential Reservoir

针对K油田原始地层压力高于饱和压力近15MPa,开发初期充分利用天然能量开发,油田地层压力已下降近9MPa,随着地层压力下降,部分油井日产液、日产油能力下降明显问题。利用油藏工程方法结合实验,对K油田层开展地层应力对渗透率大小的影响研究。研究结果是对于K油田地层压力水平越低对渗透率影响越大,产油指数随着地层压力的减小、渗透率影响系数的增大逐渐降低。目前K油田通过智能注水管柱优化注水,地层压力已得到有效回升,渗透率伤害系数值减小,油井产油能力得到有效提高,油田自然递减率得到有效控制,效果显著。该方法对相似油田开发具有一定的参考价值。

In view of the fact that the original formation pressure of K oilfield is nearly 15 MPa higher than the saturated pressure,the natural energy is fully utilized in the initial stage of development.At present,the formation pressure of K oilfield falls by nearly 9 MPa.With the decline of formation pressure,the daily oil production capacity of some oil wells decreases obviously.The results show that the lower the formation pressure level in K oilfield,the greater the permeability damage coefficient,and the oil production index decreases gradually with the decrease of formation pressure and the increase of permeability damage coefficient.At present,K oilfield optimizes water injection through intelligent water injection pipe string,formation pressure has been effectively raised,permeability damage coefficient value has been reduced,oil production capacity of oil wells has been effectively improved,and the effect is remarkable.