产水凝析气藏循环注气受效评价标准讨论——以大涝坝凝析气藏为例  

Effect evaluation criteria for cyclic gas injection in watered-out condensate gas reservoirs: A case study of the Dalaoba condensate gas reservoir, Tarim Basin

作　　者：李宗宇[1] 王利刚[1] 张艾[1] 黄杰[1] 张奎[1] 姚田万[1] 何云峰[1] Li Zongyu Wang Ligang Zhang Ai Huang Jie Zhang Kui Yao Tianwan He Yunfeng(Yakela Gas Production Plant, Sinopec Northwest Oilfield Company, Kuqa, Xinjiang 842017, China)

机构地区：[1]中国石化西北油田分公司雅克拉采气厂

出　　处：《天然气工业》2016年第12期51-58,共8页Natural Gas Industry

摘　　要：塔里木盆地大涝坝凝析气藏开发中后期采取循环注气,由于反凝析和水侵作用,注气机理、注气作用已不同于常规凝析气藏循环注气。为此,首先分析了注入气在地下的流动过程、与地下流体的接触作用,总结出注气过程中主要发生注气驱油、反蒸发、气窜和抑制水侵等作用。进而以注气机理为基础,结合注气前后生产井地面参数、流体监测数据、PVT数据和曲线形态特征,综合评价了生产井受效情况,并给出了各参数变化特征和变化范围。最后据典型参数变化特征,建立了3大类4种受效特征共计15项评价参数,实现了凝析气藏注气受效半定量—定量评价。大涝坝凝析气藏运用该评价标准,确定注气过程中以气驱油作用为主,产水井抑制水侵效果好,距离注气井近的生产井气驱油过程伴有反蒸发作用,生产井未发生气窜。结论认为:该评价标准为进一步优化注气方案提供了依据,并且所描述的注气机理和所建立的受效标准对采取循环注气开发的凝析气藏有一定的参考作用。Cyclic gas injection is adopted in the middle and late development periods of the Dalaoba condensate gas reservoir, Tarim Ba- sin. Due to the dual effects of retrograde condensation and water invasion, its gas injection mechanism and effect are different from those of conventional condensate gas reservoirs. In this paper, analysis of the flowing process of injected gas in the reservoirs and the contact of injected gas with reservoir fluids indicates that oil displaced by injected gas, retrograde vaporization, gas channeling and water invasion inhibition are the dominant phenomena in the process of gas injection. Then, based on gas injection mechanism, together with the ground parameters of a gas producer before and after gas injection, fluid monitoring data, PVT data and curve characteristics, the effects on the gas producer were evaluated comprehensively, and the variation characteristics and range of all parameters were also analyzed. Finally, 15 evaluation parameters for four types of effect characteristics in three categories were established depending on the variations of typical parameters, and the gas injection effect of condensate gas reservoirs could be evaluated semi-quantitatively or quantitatively. The Dalao- ba condensate gas reservoir was evaluated according to the above criteria. It is proved that gas displacing oil is dominant in the process of gas injection; that water invasion is well inhibited in the gas producers with water, retrograde vaporization occurs while oil is being displaced by the gas in the gas producers close to the gas injectors; and that no gas channeling emerges in the gas producers. To sum up, this study provides an important basis for the further optimization of gas injection scheme, and the gas injection mechanism and the effect evaluation criteria are, to some extent, significant to the development of condensate gas reservoirs by means of cyclic gas injection.

关 键 词：气驱油 反蒸发 气窜 抑制水侵 循环注气 受效评价 产水 凝析气藏 塔里木盆地 大涝坝凝析气藏 

分 类 号：TE372[石油与天然气工程—油气田开发工程]