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天然气地球科学

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煤层气井产水影响因素及类型研究——以沁冰盆地柿庄南区块为例

朱学申，梁建设，柳迎红，王存武，廖夏，郭广山，吕玉民   

  1. 中海油研究总院新能源研究中心，北京 100028
  • 收稿日期:2016-07-25 修回日期:2017-03-30 出版日期:2017-05-10 发布日期:2017-05-10
  • 作者简介:朱学申（1987-），男，河南平顶山人，工程师，硕士，主要从事煤层气地质勘探与开发评价工作. E-mail：zhuxsh3@cnooc.com.cn.
  • 基金资助:

    中国海洋石油总公司科技项目（编号：CNOOC-KY-125ZDXM-00-ZY-01-15）；中国海油科技攻关资助项目（编号：YXKY-2015-ZY-08）联合资助.

Influencing factor and type of water production of CBM wells: Case study of Shizhuangnan block of Qinshui Basin

Zhu Xue-shen，Liang Jian-she，Liu Ying-hong，Wang Cun-wu，Liao Xia，Guo Guang-shan，Lü Yu-min   

  1. CNOOC Research Institute New Energy Research Center,Beijing 100028,China
  • Received:2016-07-25 Revised:2017-03-30 Online:2017-05-10 Published:2017-05-10

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摘要：

为了探讨煤层气井产水的来源，以柿庄南区块为研究对象，重点分析了煤层气井产水影响因素，通过提取典型日产水量与日产气量的指标，分析柿庄南区块X-1井区的产水特征。研究表明：①外源水是造成煤层气井高产水的主要原因，含煤岩系中的孔_裂隙系统、断层及压裂缝为水源提供了运移通道；②柿庄南区块X-1井区煤层气井典型日产水量与典型日产气量具有明显的负相关关系，排采煤层内源水的煤层气井典型日产水量主要为2~7m3/d，而排采外源水的煤层气井典型日产水量7m3/d以上，其中43.8%高产水井典型日产水量大于14m3/d，难以有效降低煤储层压力，制约煤层气井的产气潜力；③基于对煤层气井产水来源和补给通道的分析，提出了构造低幅汇水型、天然裂隙（断层）导通型、自然天窗渗透型、岩溶陷落柱导水型和压裂造缝沟通型等5种产水类型，指明了各种产水类型的识别和预测方法，为煤层气井产水量的预测和高效排采制度的制定提供依据。

关键词: 柿庄南, 煤层气, 影响因素, 产水类型

Abstract:

Shizhuangnan block was taken as a case study to examine the water sources of CBM wells with high water production.After analyzing the relationship between typical daily water and gas production data from 58 producing wells in the X-1 well  area of Shizhuangnan block,some controlling factors of the CBM wells with high water production were discussed,and some characteristics of water productions started emerging.Some preliminary conclusions are proposed as follows:(1)Water production of CBM wells can be generally sourced from “Syngenic” and “Allogenic” water;Allogenic water is the main cause of high water production of CBM wells,and the pore-fractures networks,faults and fractures in the coal-bearing formation provide suitable migration pathways for such water production.(2)A significant negative correlation between typical daily water production and typical daily gas production appears to exist,at least from some wells in the study area.The typical daily water production with main syngenic water in the coalbed is commonly 2-7m3/d,in contrast other wells with main water sourced from allogenic water is typically greater than 7m3/d,with 43.8% of such wells producing more than 14m3/d.The high water production prevents lowering coal reservoir pressure which in turn restricts the increase of gas production of such CBM wells.(3)Based on the analysis of water sources and recharge paths,five water production types are proposed,and the identification and prediction methods of high water yield are also present which can provide a basis for the prediction of water production in the field.

Key words: Shizhuangnan block, CBM, Influence factor, Type of water production

中图分类号: 

  • TE132.2

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