库车坳陷东部T2凝析气藏反凝析伤害评价实验及模拟  

Experiment and simulation on retrograde condensation damage evaluation in the T2 condensate gas reservoir of the eastern Kuqa Depression

作　　者：刘永福[1] 张如杰 李洪[1] 杨文明[1] 郭德强 乐平[2] 张博[1] 耿洁 LIU Yongfu;ZHANG Rujie;LI Hong;YANG Wenming;GUO Deqiang;YUE Ping;ZHANG Bo;GENG Jie(Tarim Oilfield Company,PetroChina,Xinjiang Korla 841000,China;National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]中国石油塔里木油田分公司,新疆库尔勒841000 [2]西南石油大学油气藏地质及开发工程全国重点实验室,成都610500

出　　处：《非常规油气》2025年第2期73-81,共9页Unconventional Oil & Gas

基　　金：四川省科技厅区域创新合作项目“致密油藏水平井体积压裂多尺度非线性流动耦合模型及产能预测”(20QYCX0028);四川省科技计划项目“致密储层复杂结构并多尺度非线性流动耦合模型研究”(24LHJJ0237)。

摘　　要：为明确库车坳陷东部T2凝析气藏反凝析伤害程度,开展了凝析气藏相态特征分析和岩心反凝析伤害评价实验,通过数值模拟评价了不同初始地层压力和不同采气速度下反凝析伤害程度。结果表明,阳霞组和克孜组在反凝析初期的气相渗透率伤害较弱,阳霞组反凝析伤害主要发生在20~40 MPa,克孜组反凝析伤害主要发生在11~24 MPa,阳霞组最大反凝析伤害程度高于克孜组;岩心绝对渗透率与最大反凝析伤害程度之间存在较好的幂函数关系(y=63.438x^(-0.153),R^(2)=92.49%);不同初始地层压力下,全直径岩心模型最大凝析油饱和度为27.23%,在模型初始地层压力低于露点压力初期,模型最大凝析油饱和度快速减小;采气速度越大,初期的最大凝析油饱和度越大,其对应的平均地层压力相对更高,反凝析伤害主要发生在近井30 m内,在生产末期,反凝析伤害主要发生在近井40 m内,但采气速度为8%和10%在近井20 m内压力过低,凝析油饱和度小于采气速度5%的凝析油饱和度。该研究成果对其他凝析气藏反凝析评价具有借鉴意义。In order to determine the retrograde condensation damage degree in the T2 condensate gas reservoir of the eastern Kuqa Depression,the phase characteristics of the condensate gas reservoir were analyzed,and the retrograde condensation damage evaluation experiments with cores were carried out.The retrograde condensation damage degree was evaluated by numerical simulation under different initial formation pressures and different gas production rates.The results show that the Yangxia Formation and Kezilenur Formations exhibit relatively mild gas phase permeability damage during the initial stage of retrograde condensation,the retrograde condensation damage of Yangxia Formation mainly occurs at 20~40 MPa,and the retrograde condensation damage of Kezilenur Formation mainly occurs at 11~24 MPa.The maximum retrograde condensation damage of Yangxia Formation is higher than that of Kezilenur Formation.There is a good power function relationship between absolute core permeability and maximum retrograde condensation damage degree:y=63.438x^(-0.153),R^(2)=92.49%.Under different initial formation pressures,the maximum condensate oil saturation of the full-diameter core model is 27.23%,and the maximum condensate oil saturation decreases rapidly when the initial formation pressure of the model is lower than the dew point pressure.The higher the gas recovery rate,the greater the maximum condensate oil saturation in the initial stage,the corresponding average formation pressure is relatively higher,and the retrograde condensation damage mainly occurs within 30 m near the wellbore.At the end of production,the retrograde condensation damage mainly occurs within 40 m near the wellbore,but the pressures are very low within 20 m near the wellbore,and condensate oil saturation is less than that of the gas recovery rate 5% when the gas recovery rates are 8% and 10%.The research results can be used as a reference for the retrograde condensation evaluation of other condensate gas reservoirs.

关 键 词：库车坳陷东部 凝析气 反凝析伤害 初始地层压力 采气速度 伤害半径 数值模拟 

分 类 号：TE372[石油与天然气工程—油气田开发工程]