西峰油田长8储层增注工艺研究

Research on enhancing injectivity technology in Chang 8 reservoir of Xifeng Oilfield

西峰油田是近年来国内发现的少有的几个整装油田之一,对长庆油田上产、稳产具有重要意义。但随着开发时间的延长,油水井堵塞问题日益严重,欠注水井逐年增多,严重影响了油田的稳产及高效开发。根据西峰油田长8储层特征和注水现状,分析了注水压力升高原因,对前期增注工艺效果进行了评价。在此基础上,近几年在西峰油田长8储层开展了氧化型深部酸化增注工艺试验,并对压裂增注工艺进行了改进,取得明显效果,油田开发形势得到一定改善。通过对2种增注工艺的适应性、优缺点及措施效果的评价,提出了西峰油田下一步增注工艺的方向。

Xifeng Oilfield is one of the unwonted unitary oilfields. It was discovered in recent two years. Now it has become the important part in Changing Oilfield. As the exploitation time becomes longer, the plugging of oil-water well is getting more and more serious and the under-injected wells is rising. The stable and efficient development of Xifeng Oilfleld has been severely affected. Based on the characteristics and water injection status of Chang 8 reservoir, the reasons for the increased injection pressure are analyzed and the preliminary technical results by injection are evaluated in this paper. On this foundation, the injection technical tests with deep oxidation acidizing have been carried out in Chang 8 reservoir since 2005. Besides, the fracturing injection technology is improved with noticeable results, which improves the development situation of this oilfield. According to evaluation of the two injection technologies, including the adaptability, advantages and disadvantages and effects, the direction of next step to increase injection rate is put forward.