超深层裂缝性致密砂岩气藏水侵动态特征分析——以库车坳陷克深2气田为例  

Analysis of water invasion performance of ultra-deep and naturally fractured tight sand gas reservoirs——A case study of Keshen-2 gas field

作　　者：罗瑞兰[1] 张永忠[1] 刘敏[2] 张建业[2] 冯金德[1] 陈宝新[2] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油塔里木油田分公司勘探开发研究院,新疆库尔勒841000

出　　处：《浙江科技学院学报》2017年第5期321-327,345,共8页Journal of Zhejiang University of Science and Technology

基　　金：中国石油天然气股份有限公司重大科技专项(2014E-3203)

摘　　要：为了研究水侵对超深层裂缝性致密砂岩气藏生产的影响,把库车坳陷克深2气田为对象,利用日常生产数据,采用现代气井生产动态分析方法,通过分析该类气藏/气井的水侵动态特征,从而建立产水预警模式。根据气井产气指数变化特征,将产水气井生产划分为清井期、无水侵期、水侵初期和产水期四个阶段。在水侵初期,产气指数因能量补给而明显增大,成为水侵预警的标志,水侵一旦突破井底,产气指数将快速降低。位于气藏不同部位的气井,其各阶段持续时间不同,水气比、产水指数等亦有差别。与氯离子浓度监测、地面气水分离计量等方法相比,产气指数判别法能够更早识别气藏/气井水侵,并且经济方便,这对及时调整开发对策、保障气田控水稳产具有积极作用。In order to explore the effects of water invasion upon the production of ultra-deep and naturally fractured tight sand gas reservoirs,this paper analyzes the water invasion performances of this kind of reservoir,and establishes an early warning model of water influx based on routine production data by employing the modern gas well production performance analysis method,with the Keshen-2 gas field in Kuqa Depression as an example.According to the characteristics of gas productivity indexes,the production performance of gas wells can bedivided into four stages：well cleanup period,no water invasion period,early water invasion period and water producing period.In the early stage of water invasion,the gas productivity indexes will increase significantly due to energy supply provided by water,which will become the symbol of water invasion warning.Once water breaks through the bottom hole,the gas productivity index will be reduced rapidly.Gas wells located at different positions in the reservoir,differ in the duration of each stage,the ratio of water to gas,and the water productivity index.Compared with the chloride ion concentration monitoring,as well as the gas and water separation metering method,the method of gas productivity indexes can identify water invasion earlier in the economical and convenient manner.This method has positive effects on adjusting the development strategy,controlling water and stablizing production of the gas field.

关 键 词：超深层 天然裂缝 致密砂岩气藏 产气指数 水侵动态特征 克深2气田 

分 类 号：TE332[石油与天然气工程—油气田开发工程]