长期停产对油田开发规律的影响

摘要

Long time shutdown of oilfield has a significant influence on oilfield development discipline,recoverable reserves and recovery ratio. It is an important factor in the adjustment of oilfield development. By analyzing the production performance before and after the shutdown period and by comparing the oil rate and water cut performance,the oil rate profile influenced by the shutdown of the oilfield was studied. This study starts from the practical situation of oil reservoirs and lays an emphasis on practical oilfield production data analysis. The curve of water-cut vs. recovery percent of reserves,the dimensionless forecasting models,the production decline model and water flooding curves were applied to predict the recoverable reserves and recovery ratio before and after the shutdown period. In addition,by mutual authentication of different reservoir engineering methods, the impact of the longtime shutdown on the oilfield development and reservoir characteristics can be analyzed. It has shown some positive outcomes because of the buildup of the producing energy,the redistribution and movement of the underground fluid. This research fills the gap in researches on influence of long-term shutdown and provides a new angle of analyzing oilfield discipline in similar oil reservoirs.%油田开发中途停产对油田开发规律、油田可采储量和采收率的影响至关重要，是油田进行开发调整不可忽略的影响因素。通过分析停产阶段前后油田的开发规律，将停产前和复产后的产油量、含水变化规律进行对比，研究停产关井对产量趋势的影响。从油田实际生产出发，依托实际油田生产数据，利用含水率和采出程度关系曲线、无因次单峰周期模型、产量递减模型、水驱特征曲线预测停产前和复产后油田的可采储量和最终采收率。通过多种油藏工程方法相互验证，判断长期停产对油田开发以及油藏特征的影响程度，指明停产阶段地层能量恢复和油水重新分布、运移对油田开发产生的有利影响，填补油田长期大范围停产对油田开发规律影响这方面的研究空白，为同类油田的开发规律分析提供思路和方法借鉴。