基于试井分析方法的元坝气田水侵早期识别  

Early identification of water invasion in Yuanba Gas Field based on well test analysis method

作　　者：胡景涛[1] 王本成[1] 王勇飞[1] 张明迪[1] HU Jingtao;WANG Bencheng;WANG Yongfei;ZHANG Mingdi(Sinopec Southwest Oil and Gas Company,Chengdu 610041,China)

机构地区：[1]中国石化西南油气分公司,成都610041

出　　处：《非常规油气》2023年第3期89-97,111,共10页Unconventional Oil & Gas

基　　金：国家重大专项“超深层复杂生物礁底水气藏高效开发技术”(2016ZX05017005)。

摘　　要：为准确识判底水气藏早期水侵,提前主动采取有效的防控水措施,降低底水锥进对气藏开发的影响,针对目前水侵识别方法识判时间滞后,贻误控水时机的问题,综合考虑元坝气田实际地质情况,建立了考虑有限水体的底水气藏水平井试井分析理论模型,绘制了试井典型样版曲线,分析了底水锥进对试井样版曲线的影响规律。通过对元坝气田典型井历年试井测试资料进行剖析,结果表明:1)利用试井分析方法识判气井早期水侵,比常规的水化学分析法提前0.58年;2)早期水侵严重伤害储层渗透率,有效渗透率大幅降低9.7%,但可补充地层能量,单位压降采气量提高15.3%;3)早期水侵井实施控制产量在底水锥进临界产量下的控水措施,延长无水采气期4年以上。该研究成果为底水气藏提前识判气井水侵,提高含水区气井储量动用率与采收率提供了理论支撑。In order to accurately identify the early water invasion of gas reservoirs with bottom water,effective waterproof and water control measures should be taken in advance to reduce the influence of bottom water coning on gas reservoir development.Aiming at the problem that the current water intrusion identification methods lag time and delay the time of water control,a theoretical well test analysis model of horizontal well in gas reservoir with bottom water considering the actual geological conditions of Yuanba Gas Field is established.The typical sample curve of well test is drawn and the influence law of bottom water coning on the sample curve of well test is analyzed.Through the analysis of the well test data of typical wells in Yuanba Gas Field over the years,the results show that:1)The well test analysis method is 0.58 years earlier than the conventional water chemical analysis method to identify the early water invasion of gas well;2)Early water invasion seriously damaged the reservoir permeability,the effective permeability decreased by 9.7%,but it could supplement the formation energy and increase the gas production per unit pressure drop by 15.3%;3)In the early water invasion stage,the water control measures under the critical output of bottom water coning have achieved remarkable results,extending the water-free gas recovery period for more than 4 years.The research results provide theoretical support for identifying gas well water invasion in advance and improving the utilization rate and recovery efficiency of gas well reserves in water-bearing gas reservoir.

关 键 词：元坝气田 底水气藏 不稳定试井分析 样版曲线 水侵早期识别 

分 类 号：TE344[石油与天然气工程—油气田开发工程]