三重介质气藏单井生产动态分析模型研究  

Analytic Model of Single Well Production Performance in Triple Porosity Medium Reservoirs

作　　者：刘永良[1] 刘彬[1] 刘大伟 徐艳霞[1] 张俊良[1] 曾勇[1] 

机构地区：[1]中石油西南油气田分公司川东北气矿,四川达州635000 [2]渤海钻探工程有限公司工程技术研究院,天津300457

出　　处：《石油天然气学报》2011年第2期123-127,168,共5页Journal of Oil and Gas Technology

基　　金：教育部博士学科点新教师类基金项目(20095122120012)

摘　　要：针对缝洞型碳酸盐岩气藏生产问题,建立了考虑表皮系数的三重介质气藏单井产量递减数学模型,运用Stefest数值反演绘制了Blasingame产量递减特征曲线,并对产量递减曲线形态及影响因素进行了分析。结果表明:产量递减特征曲线分为6个阶段;产量曲线出现2个相对平缓递减段;产量积分的导数曲线出现2个类似三重介质气藏试井曲线特征的凹子,凹子出现的早晚受窜流系数影响,凹子的深浅受储容比影响;产量递减晚期,无因次递减产量积分与积分的导数曲线晚期为一条斜率为-1的直线,表现为调和递减。该研究结果比压力恢复试井更具优越性,可为缝洞型碳酸盐岩气藏的开发提供指导。In order to solve the production problem in fracture-vug carbonate rock reservoirs,a mathematical model of skin factors was developed for calculating single well production decline in triple porosity medium gas reservoirs.The production decline Blasingame type curves of single gas well in triple-porosity reservoirs was drawn by using Stefest numerical inversion.Then,the characteristics of production decline curve and its influencing factors were discussed.The results indicate that production decline curves are divided into six periods with two relatively smooth decline periods.In the production integration derivate curves,there are two concaves,which are similar with the type curves of well test of triple-porosity reservoirs.And concave occurrence time is determined by inter-porosity flow coefficient and concave extent is determined by storage ratio.A straight line with slope of-1 is emerged in both the integral and integral derivative curves at late period of production decline curves,which is the indication of harmonic decline.The results are superior to that of pressure buildup test,therefore,it provides a guidance for the development of vug carbonate rock gas reservoirs.

关 键 词：三重介质 气藏 缝洞型 产量递减 Blasingame曲线 生产动态 

分 类 号：TE319[石油与天然气工程—油气田开发工程]