单井和区块动储量评估方法优选及应用——以某断块小气藏为例  

Comparisons and application of single well and reservoir dynamic reserves evaluation methods: Case study of a small fault block gas reservoir

作　　者：王晨辉 贾爱林[1] 位云生[1] 郭智[1] WANG Chenhui;JIA Ailin;WEI Yunsheng;GUO Zhi(Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083 China)

机构地区：[1]中国石油勘探开发研究院,北京100083

出　　处：《天然气地球科学》2024年第4期585-595,共11页Natural Gas Geoscience

基　　金：中国石油天然气股份有限公司十四五前瞻性基础性重大科技项目“复杂天然气田开发关键技术研究”(编号:2021DJ1706)资助。

摘　　要：气藏动态储量是气藏开发方案编制和气藏评价的重要依据之一。为提高气藏动储量估算的一致性和准确性,以某整装小断块气藏为研究对象,对物质平衡法和现代产量递减法等7种单井动储量估算方法进行了对比评价和敏感性分析,并提出了分析中可能会遇到的几种问题。同时研究了井间干扰对动储量估算的影响,并比较了单井累加法和多井Blasingame法在区块动储量估算中的准确性。结果表明,对于单井动储量估算,现代产量递减法操作简单、估算结果稳定、平均误差小于1%,相比之下,常用的物质平衡法在直线段拟合上缺乏稳定性和准确性。因此,推荐使用现代产量递减方法进行单井动储量估算。其次,对于区块动储量估算,多井Blasingame法是一种有效解决井间干扰的方法,只需使用一口井即可估算整个区块的动储量。使用该方法对10口井进行全区动储量估算,结果显示10口井各自得到的区块动储量均收敛于一个值,即断块动储量。最后,探讨了井控范围内的采出程度。针对采出程度低的井,建议保持气藏压力、提高气体的膨胀性以提高采收率。The dynamic reserves of gas reservoirs are one of the important parameters for developing exploitation plans and evaluating gas reservoirs.Improving the consistency and accuracy of gas reservoir reserves evaluation is crucial.This study focuses on a small block gas field and compares seven sub-methods,including material balance and modern rate transient analysis methods,to calculate single well controlled dynamic reserves.Sensitivity analyses are conducted,the impact of inter-well interference on reserve estimation is studied and various problems encountered in the calculation are discussed.The results show that the commonly used material balance method lacks stable and accurate linear fitting for single well reserve estimation.In contrast,the modern rate transient analysis is simple to operate and yields stable results with average errors less than 1%.Therefore,this study recommends rate transient analysis methods for the dynamic reserve estimation.Regarding reservoir dynamic reserves estimation,the multi-well Blasingame method is an effective method for dealing with inter-well interference and it can estimate the reservoir dynamic reserves with only one well.The reserves calculated by 10 wells converge to a fixed value,which is the reservoir reserve.Finally,well controlled recovery is classified and studied among different wells and technical countermeasures are provided consequently to improve the recovery factor of the reservoir,including maintaining the reservoir pressure and improving the gas expansibility.

关 键 词：物质平衡法 现代产量递减法 动储量 井间干扰 

分 类 号：TE151[石油与天然气工程—油气勘探]