摘要
为提高凝析气藏凝析油采收率,以塔中I号气田Ⅱ区高、特高含凝析油凝析气藏为例,建立了最大反凝析速度判别方法,结合生产动态特征,开展不同储层类型的高、特高含凝析油型凝析气藏单井周期注气数值模拟分析。研究表明:1根据反凝析液量与压力变化关系得到的单位压降凝析液析出速度拟合特征曲线会出现多个极值点,第1个极大值点是单位压降凝析油析出速度最快压力点,第1个极小值点是保压开采最低压力点;2衰竭开采反凝析程度越大,则凝析气中组分含量比值(C2—C6)/C1越大,则周期注气提高凝析油采收率越高;3水侵体积系数越大,裂缝发育程度越小,基质(洞穴、孔洞储层)与裂缝耦合程度越高,则周期注气提高凝析油采收率越高;4相对衰竭开采,注入C1、C2均能一定程度提高凝析油产量,C2抽提、驱替凝析油效果更好。
Taking the condensate gas reservoir with high to high-super content of condensate oil in II block of No. 1 gasfield of central Tarim as an example,a method for judging the maximum reverse condensate velocity is established to enhance the recovery factor of condensate oil in condensate gas reservoir. The periodic gas injection mechanisms of different types of condensate gas reservoirs with high to high-super content of condensate oil are analyzed by numerical simulation based on the dynamic production characteristics of single wells. It is shown that： ① There are several extreme points on the fitting characteristic curve of the precipitation rate of the condensate liquid per the unit pressure drop based on the relationship between condensate oil and pressure. The first extreme maximum point is of the greatest precipitation rate of condensate oil per unit pressure drop,the first extreme minimum point is the lowest pressure point for exploiting the condensate under holding formation pressure when formation pressure is lower than dew point pressure. ② The greater the retrograde condensate degree during depletion development and the component ratio（ C2～ C6） /C1 of condensate gas,the more the enhanced recovery factor of condensate oil in cyclic gas injection. ③ The greater the water invasion volume coefficient,the worse the fracture development and the higher the coupling degree of matrix（ cave and vug reservoir） and fracture,the more the enhanced recovery factor of condensate oil in cyclic gas injection. ④ Compared with depletion development,to inject C1 and C2can all enhance the recovery factor of condensate oil,and to inject C2 can achieve better extraction and oil displacement effect.
出处
《西安石油大学学报（自然科学版）》
CAS
北大核心
2016年第2期57-64,共8页
Journal of Xi’an Shiyou University（Natural Science Edition）
基金
国家科技重大专项"大型油气田及煤层气开发"(编号:2011ZX05059-001)部分研究成果
关键词
凝析气藏
周期注气
注气数值模拟
凝析油采收率
塔中
condensate gas reservoir
periodic gas injection
numerica simulation of gas injection
recovery factor of condensate oil
Central Tarim
作者简介
程亮（1977-），男，工程师，博士研究生，主要从事油藏工程、提高采收率技术研究。E-mail：cldejia200@sina．com.cn
