东海H气田低渗气藏产水定量评价及产能影响规律  

Quantitative evaluation of water production and the variation law ofproductivity in low permeability gas reservoirs in East China Sea H gas field

作　　者：杨志兴 张春光 伍锐东 石美雪 闫鑫源 YANG Zhixing;ZHANG Chunguang;WU Ruidong;SHI Meixue;YAN Xinyuan(Shanghai Company,CNOOC(China)Co.,Ltd.,Shanghai 200335,China)

机构地区：[1]中海石油(中国)有限公司上海分公司,上海200335

出　　处：《石油地质与工程》2023年第3期52-57,共6页Petroleum Geology and Engineering

基　　金：中国海洋石油集团有限责任公司科技项目(CNOOC-KJ 135 ZDXM 39 SH03)。

摘　　要：针对东海低渗气藏可动水饱和度及产水气井的产能影响机制缺乏定量评价方法的问题,基于室内驱替、离心实验及核磁共振实验并进行统计分析,建立东海低渗气藏衰竭开发过程中可动水饱和度定量预测模型;结合气水相渗曲线及渗流理论,实现了可动水饱和度到生产水气比的精细计算;考虑气井产水的影响,修正产能方程,明确水气比对产能的损害机制,并利用产水气井生产动态参数精确计算气相渗透率,建立气水两相流动态产能评价方法。现场应用表明,东海H气田可动水饱和度小于10%,水气比小于0.97 m 3/104 m 3,受可动水影响,气井产能下降30%,气水两相流动态产能评价结果与多时间点的实测产能基本吻合,研究成果在东海低渗气藏取得了较好的应用效果。In view of the lack of quantitative evaluation methods for movable water saturation and productivity impact mechanism of water producing gas wells in low permeability gas reservoirs in the East China Sea,a quantitative prediction model of movable water saturation during depletion development of low permeability gas reservoirs is established based on laboratory displacement,centrifugal and nuclear magnetic resonance(NMR)experiments and statistical analysis.Considering the impact of water production of gas wells,the productivity equation is modified to clarify the damage mechanism of water gas ratio to productivity.With the production performance parameters of water-producing gas wells,the gas phase permeability is calculated and the dynamic productivity evaluation method of gas-water two-phase flow is established.Field application shows that the movable water saturation of H gas field in the East China Sea is less than 10%,and the water-gas ratio is less than 0.97 m 3/104m 3.Affected by the movable water,the gas well productivity is reduced by 30%.The dynamic productivity evaluation results of gas-water two-phase flow are basically consistent with the measured productivity at multiple time points,and the research results have achieved a good application effect.

关 键 词：低渗气藏 核磁共振 可动水 产能方程 动态产能 

分 类 号：TE348[石油与天然气工程—油气田开发工程]