摘要
新立油田已开发区块属于低渗透-特低渗透油藏,注水开发过程中,普遍具有注采比偏高的现象,这与物质平衡原理相悖。通过结合新立油田地质特征和开发特点研究,认为高注采比主要受无效注水、垂直裂缝、弹性存水量、储层沉积特点和固井质量等因素影响;通过校正计算,合理地解释了低渗透油田高注采比现象,并对开发后期注采比变化趋势进行了预测,引入油层盈余概念作为注采平衡评价的一种新方法。
The injection- production ratio of the developed blocks in Xinli Oilfield, which belongs to low- ultra low permeability reservoirs, is generally high in water flooding development. The phenomenon contradicts the principle of mate- rial balance. Based on the geologic feature and development characteristics of the oilfield, it is considered that the high in- jection - production ratio is mainly affected by invalid water flooding, vertical cracks, elastic water save, reservoir sedimen- tary characteristics, and cementing quality. The reasons of the high injection - production ratio were reasonably explained by calibration calculation and the change trend of the injection - production ratio in the late stage of production was fore-casted . And the concept of oil surplus is introduced to use as a new method for injection - production balance evaluation.
出处
《复杂油气藏》
2012年第2期54-58,66,共6页
Complex Hydrocarbon Reservoirs
基金
中国石油二次开发项目"新立油田二次开发"技术攻关项目子课题(ER20100109)
关键词
低渗透油藏
注采比
无效注水
弹性存水量
新立油田
low permeability
injection - production ratio
reason
invalid injection
elastic water save
Xinli Oilfield
