带底油凝析气藏层间干扰定量表征方法及应用——以渤海B油气田为例  

Interlayer interference evaluation and application in the condensate gas reservoir with bottom oil:Case study of B oilfield in Bohai Sea

作　　者：闫建丽 李超 雷源 马栋 王鹏 YAN Jianli;LI Chao;LEI Yuan;MA Dong;WANG Peng(Tianjin Branch of CNOOC Limited,Tianjin 300459,China)

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300459

出　　处：《天然气地球科学》2025年第2期335-341,共7页Natural Gas Geoscience

基　　金：中海石油(中国)有限公司重大科技项目“海上低渗及潜山油气田有效开发技术”(编号:KJGG2022-0700)资助。

摘　　要：渤海B油气田凝析气藏底部为厚度较大的潜山油藏,随着天然能量衰竭开发,潜山油藏的原油被凝析气井逐步产出,对凝析气层造成不同程度的层间干扰,使得地下真实开采情况变得异常复杂。针对海上分层产能测试成本高、测试资料少、油气干扰研究较少等现状,在分析生产动态数据、压力数据以及流体性质资料的基础上,基于油密度和气油比动态产量劈分法的差异性,提出了原油干扰系数这一评价指标,定量表征了开采过程中原油对气层凝析油产出的影响程度和层间干扰变化规律,寻找了产出贡献规律并制定相应的合理开发策略,有效指导了现场生产制度优化,降低了底部原油干扰程度,提升了油气采收率;考虑层间干扰影响校正后的气油比动态劈分后的结果,大大提高了带底油凝析气井的油气合采的产量劈分精度,为油气田剩余潜力挖潜提供了准确可靠的依据。该方法可为带底油的凝析气藏或带凝析气顶油藏等复杂油气藏的开发提供重要的借鉴。For condensate gas cap reservoir with bottom oil in B oilfield in Bohai Sea,bottom oil was produced by condensate gas well with the depleted development.The production splitting of crude oil and condensate oil is imperative for production optimizations in reservoir management.Based on the difference between the production splitting methods of oil density and gas-oil ratio,the interlayer interference of crude oil to gas condensate oil during production were quantitatively characterized.The concepts of oil invasion coefficient,interference limit and its applications were given.New choke size selection was recommended for the reservoir management.Based on the interlayer interference evaluation,after oil invasion correction the production splitting method of gas-oil ratio were more accurate,which provided reliable basis for tapping the remaining potential.The method can provide important reference and technical support for the development of similar complex reservoirs such as condensate gas reservoirs with oil rings or gas capped reservoirs.

关 键 词：凝析气藏 带底油 产量劈分 层间干扰 产量优化 

分 类 号：TE345[石油与天然气工程—油气田开发工程]