鄂尔多斯盆地N区S2储层产水特征研究

Study on water production characteristics of S2 reservoir in N zone,Ordos Basin

鄂尔多斯盆地N区属于典型的致密砂岩岩性气藏,储层厚度小、埋藏深度大、非均质性强,横向变化快,孔渗关系复杂,在气田开发过程中,储层出现了不同程度的产水现象,特别是S2储层,疑似产水严重,部分改造S2储层气井积液严重甚至积液停产,严重影响气井正常生产。然而,目前对产出水来源的认识还不够清晰,给气田开发带来一定的困难。为此,在前人的研究基础上,通过分析研究区块内所有改造S2储层的气井的生产数据及测井资料,对典型封堵措施井SN0001井及两相计量试验井产水特征进行分析总结,利用N区邻近区域的延安-安边砂带及哈汗兔庙-杨桥畔砂带的S2储层单试气井的测井及试气资料进行重点分析研究,建立了N区S2储层气井产水界限,确定了气井产水的储层测井响应特征临界线,应用井口两相计量试验井和封堵措施气井进行了对比验证,同时利用该气水界限对全区块内改造S2储层的气井的产水特征进行了分析预测,建议在45口高产水风险气井中优选部分井列入2022年两相计量测试计划,进一步论证S2储层的产水特征,以指导后续对S2储层的生产建设和气田开发工作。

The lithological of gasfield in N block belongs to a typical tight sandstone gas reservoir.The reservoir is thickness and have a large buried depth,strong heterogeneity,lateral change fast,the poroperm relationship is complex.In the process of gasfield development,reservoir has a different levels of water production,especially the S2 layer is serious suspected,and part of gas well effusion serious water,even affect the normal production.However,at present,the understanding of the source of produced water is not clear enough,which brings some difficulties to the development of gasfields.Therefore,on the basis of previous studies,through the analysis of production data and logging data of all the wells in the block that have been transformed the S2 layer,the characteristics of water production of the typical plugging measure well SN0001 and the two phase measurement test wells are summarized.Use the S2 single test gas well logging and testing data of Yan'an-Anbian sand belt area and Hahantu-Yangqiaopan sand belt area as the key to analysis research,established the N block of S2 layer gas well produced water boundaries,determine the critical path of gas well produced water,application the wellhead two phase measurement test wells and well plugging measures were compared to verify.At the same time,the water production characteristics of gas wells which include frac the S2 layer in the whole block are analyzed and predicted by using the gas water limit.It is suggested that some of the 45 gas wells which have a high risk of water production should be add in the two-phase metering test plan in 2022 to further confirm the water production characteristics of S2 layer,to guide the subsequent production,construction and development of S2 reservoir development.