基于聚类分析的煤层气二次压裂选井选层方法研究  被引量:3

Study on secondary fracturing candidate selection of coalbed methane based on clustering analysis

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作  者:马新仿 李忠城[3] 孔鹏[3] 黄宁曼[1,2] 薄海江 李雪晨 MA Xinfang;LI Zhongcheng;KONG Peng;HUANG Ningman;BO Haijiang;LI Xuechen(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China;Key Laboratory of Petroleum Engineering,Ministry of Education,China University of Petroleum(Beijing),Beijing 102249,China;CBM Research and Development Center,China United Coalbed Methane Corporation,Taiyuan 030002,China;Oilfield Production Division,CNOOC Oilfield Services Limited,Tianjin 300459,China)

机构地区:[1]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [2]中国石油大学(北京)石油工程教育部重点实验室,北京102249 [3]中联煤层气有限责任公司煤层气研发中心,山西太原030002 [4]中海油田服务股份有限公司油田生产事业部,天津300459

出  处:《中国矿业》2022年第1期79-87,共9页China Mining Magazine

基  金:十三五国家科技重大专项“沁水盆地高煤阶煤层气高效开发示范工程”资助(编号:2017ZX05064)。

摘  要:山西沁水盆地柿庄南区块煤层气井初次压裂生产多年后整体产气量下降,迫切需要进行二次压裂以提高产能,而目标井段的选取对二次压裂的设计施工及增产效果具有极为重要的影响。针对山西沁水盆地柿庄南区块二次压裂试验井数少、样本数量有限的问题,提出基于聚类分析的煤层气二次压裂选井选层方法。综合考虑地质储量、可压性和工程三方面因素建立二次压裂选井的层次聚类模型;再根据施工曲线特征设置压裂风险短路条件,排除复压风险高的井,并结合聚类集成算法,最终确定每口井的复压潜力大小。以山西沁水盆地柿庄南区块15口井为例开展了各井二次压裂改造潜力评价,优选B01井为目标井,二次压裂后取得了较好的增产效果。该研究可为井数有限条件下的二次压裂选井选层提供一种有效方法,为后续压裂生产提供依据和借鉴。After years of first fracturing of coalbed methane wells in Shizhuang south block of Qinshui basin,Shanxi province,the overall gas production has declined,and it is urgent to carry out secondary fracturing to improve the production capacity,and the selection of target wells has a very important impact on the design and construction of secondary fracturing and the stimulation effect.In order to solve the problem of low number of secondary fracturing test wells and limited number of samples in the block,the method of fracturing candidate based on clustering analysis is proposed.Considering geological reserves,compressibility and engineering factors,the hierarchical clustering model of secondary fracturing well selection is established;according to the characteristics of construction curve,fracturing risk short-circuit conditions are set to exclude wells with high overpressure risk.Combining with clustering integration algorithm,the secondary fracturing potential of each well is finally determined.Taking 15 wells in this block as examples,the potential of secondary fracturing for each well is determined,and B01 well is selected as the target well.After the secondary fracturing,a good stimulation effect was achieved.This study can provide an effective method for well and layer selection under the condition of limited number of wells,and providing basis and reference for subsequent fracturing production.

关 键 词:聚类分析 煤层气 二次压裂 选井选层 

分 类 号:TE35[石油与天然气工程—油气田开发工程]

 

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