南海东部水驱气藏水侵特征及开发技术政策  

Water Invasion Characteristics and Development Technology Policies of Water-drive Gas Reservoirs in Eastern South China Sea

作　　者：白美丽 马云杰 洪舒娜 陈斯宇 江利 Bai Meili;Ma Yunjie;Hong Shuna;Chen Siyu;Jiang Li(Shenzhen Branch of CNOOC China Limited,Shenzhen Guangdong 518000)

机构地区：[1]中海石油(中国)有限公司深圳分公司,广东深圳518000

出　　处：《中外能源》2024年第1期48-53,共6页Sino-Global Energy

摘　　要：番禺气田为南海东部典型的水驱气藏,随着采出程度的提高,气田产水量逐年增加,产气量呈下降趋势。为此,以气田实际生产动态为基础,通过凝析水含量计算、水样测试分析、水气比变化判别法等方法对气井产水类型进行判别,形成水驱气藏早期水侵综合识别方法。分析认为,气田目前已产地层水的单井有6口,另有3口单井存在产水早期预警,其余单井以产凝析水为主。通过水侵量及水侵速度计算,明确了气藏水侵强度及水侵速度。对典型出水井的地质资料及生产动态特征等进行综合分析,将番禺气田水侵特征曲线归纳为3种类型,其中缓慢上升型主要为气藏局部连通水体,台阶状上升型主要受储层非均质或者隔夹层影响,尖峰上升型主要受储层物性及水体大小影响。针对气藏水侵特征,结合海上气田开发特点及现场经验,番禺气田在开发策略上应该以控水和井口降压为主。Panyu Gas Field is a typical water-drive gas reservoir in the eastern South China Sea.As the recovery degree increases,the water production of the gas field increases year by year,while the gas production shows a downward trend.To this end,based on the actual production performance of the gas field,the water production types of gas wells are identified through methods such as condensate water content calculation,water sample test analysis,water-gas ratio change identification,etc.,and comprehensive identification method for early water invasion in water-drive gas reservoirs is formed.Analysis shows that 6 single wells have produced formation water currently in the gas field,another 3 single wells have early warning of water production,and the remaining single wells mainly produce condensate water.Through the calculation of the water invasion vol-ume and water invasion speed,the water invasion intensity and water invasion speed of the gas reservoir are clarified.Based on the comprehensive analysis of the geological data and production dynamic characteristics of typical water producers,the water invasion characteristic curves of the Panyu Gas Field are summarized into three types.Among them,the slow rising type is mainly the gas reservoir locally connected to the water body,the stepped rising type is mainly affected by the reservoir heterogeneity or interlayer,and the peak rising type is mainly affected by reservoir physical properties and water body size.Based on the characteristics of water invasion in the gas reservoirs,combined with the characteristics of offshore gas field development and field experience,the development strategy of Panyu Gas Field should focus on water control and wellhead pressure drop.

关 键 词：水驱气藏 地层水 凝析水 水气比 水侵特征 开发策略 

分 类 号：TE53[石油与天然气工程—油气田开发工程]