低渗产水CO2气藏废弃地层压力与采收率的确定  

DETERMINATION OF ABANDONMENT FORMATION PRESSURE AND RECOVERY FACTOR OF CO2 GAS RESERVOIR WITH LOW PERMEABILITY AND WATER PRODUCTION

作　　者：黄全华[1] 尹琅[1] 郭平[1] 于希南[1] 

机构地区：[1]西南石油大学石油工程学院,四川成都610500

出　　处：《大庆石油地质与开发》2011年第1期107-110,共4页Petroleum Geology & Oilfield Development in Daqing

基　　金：油气藏地质及开发工程国家重点实验室开放基金项目“复杂裂缝性油气藏开采动态预测”（西南石油大学）（PLN0126）资助.

摘　　要：苏仁诺尔CO2气田是典型的低渗产水CO2气田，废弃地层压力和采收率的确定关系着气田长期高效开发。在二项式产能方程中考虑低渗启动压力梯度或产水等导致的附加压力损失项，确定二项式系数变化规律，推导出气井废弃时稳定的产能方程，再结合经济评价及地面工程论证确定废弃条件，求得废弃地层压力。采用气藏物质平衡方程，根据已得废弃地层压力并考虑低渗气藏的控制程度及水侵的影响最终确定了苏仁诺尔CO2气田的采收率。结果表明，CO2相态变化、储量控制程度和含气饱和度变化对低渗产水CO2气藏的废弃地层压力和采收率有较大的影响。Surennuoer gas field is a typical CO2 gas field with low permeability and water production. Determination of abandonment formation pressure and recovery factor is related to the long-term and high-efficient development of the gas field. This paper considers the term of low-permeability starting pressure gradient or additional pres- sure-loss caused by water production in the binomial productivity equation, determines the variation law of binomial coefficient, derives the stable productivity equation at abandonment of a gas well, demonstrates and determines the abandonment condition by combining economic evaluation and surface engineering, and finally finds the abandoned formation pressure. Applying the material balance equation for gas reservoir and considering the controlling extent of low-permeability gas reservoir and the influence of water invasion, the recovery factor of Surennuoer CO2 gas field is determined based on the abandonment formation pressure obtained. The result indicates that CO2 phase-state variation, reserve-controlled extent and gas saturation variation have great influence on the abandonment formation pres- sure and the recovery factor of the CO2 gas field with low permeability and water production.

关 键 词：低渗 产水 废弃地层压力 采收率 

分 类 号：TE35[石油与天然气工程—油气田开发工程]