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天然气地球科学 ›› 2020, Vol. 31 ›› Issue (8): 1161–1167.doi: 10.11764/j.issn.1672-1926.2020.04.027

• 天然气开发 • 上一篇    下一篇

煤层气多层合采井生产特征分析

石迎爽1(),梁冰2(),薛璐3,孙维吉2,王青春1,程志恒4,5   

  1. 1.华北科技学院理学院，河北 燕郊 065201
    2.辽宁工程技术大学力学与工程学院，辽宁 阜新 123000
    3.中建一局建设发展有限公司，北京 100102
    4.华北科技学院安全工程学院，河北 燕郊 065201
    5.华科中安科技( 北京) 有限公司，北京 102300
  • 收稿日期:2019-09-19 修回日期:2020-04-13 出版日期:2020-08-10 发布日期:2020-07-29
  • 通讯作者: 梁冰 E-mail:sysxl0803@163.com;lbwqx@163.com
  • 作者简介:石迎爽（1989-），女，河北衡水人，博士，主要从事非常规天然气开采理论及应用研究.E-mail: sysxl0803@163.com.
  • 基金资助:
    国家重点研发项目(2016YFC0801404);国家自然科学基金面上项目(51874166);中央高校基本科研业务费资助项目(3142020022);辽宁省教育厅青年项目(LJ2019QL005)

Analysis on production characteristics of coalbed methane multi-layer production wells

Ying-shuang SHI1(),Bing LIANG2(),Lu XUE3,Wei-ji SUN2,Qing-chun WANG1,Zhi-heng CHENG4,5   

  1. 1.College of Science, North China of Science ＆ Technology, Yanjiao 065201, China
    2.Institute of Mechanics and Engineering, Liaoning Technical University, Fuxin 123000, China
    3.China Construction First Group Construction ＆ Development Co. Ltd. ，Beijing 100102, China
    4.School of Safety Engineering，North China of Science ＆ Technology，Yanjiao 065201，China
    5.Huake Zhongan Technology(Beijing) Co. Ltd．，Beijing 102300，China
  • Received:2019-09-19 Revised:2020-04-13 Online:2020-08-10 Published:2020-07-29
  • Contact: Bing LIANG E-mail:sysxl0803@163.com;lbwqx@163.com

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摘要：

为了探究多层煤层气藏合采层间储层处液面压力的关系、层间生产压差的关系以及各储层见气时间的关系，以多层叠置独立煤层气藏为研究对象，从成藏特征和煤层气产出机理出发，基于煤层气井井底压力表达式，推导了层间储层处液面压力的关系表达式，进而推导了层间生产压差的关系表达式以及层间见气时间的关系表达式。通过分析得出：①由于层间距的存在，在下储层未暴露时，上下储层间储层处液面压力存在一定的差异，当下储层暴露后，上下储层间的储层处液面压力相等；②层间生产压差和层间见气时间也不一定相等，且差异的大小均与储层压差、层间距、储层暴露情况有关，其中层间见气时间的差异还受气井排采压差的影响。研究成果为煤层气多层合采井排采制度的制定以及多储层煤层气藏合采模拟实验方法的选取提供了理论基础。

关键词: 煤层气, 多层合采, 井底压力, 生产压差, 见气时间

Abstract:

The purpose of this paper is to study that, the relationship of reservoir liquid level pressure between the combined mining layers, the relationship of production pressure difference between the combined mining layers, and the relationship of gas-seeking time between the combined mining layers during the combined production of multi-layer coalbed methane reservoirs. To this end, this paper takes multi-layer independent coalbed methane reservoirs as the research object. Starting from the reservoir forming characteristics and coalbed methane production mechanism, based on the expression of downhole pressure expression of coalbed methane wells, the relationship expression of reservoir liquid level pressure between the combined mining layers was derived. Furthermore, the relational expression of production pressure difference between the combined mining layers and the relational expression of gas-seeking time between the combined mining layers were derived. The following conclusions are drawn through analysis. Due to the existence of the layer spacing, there is a certain difference in the reservoir liquid level pressure between the upper and lower reservoirs when the lower reservoir is bare. After the lower reservoir is exposed, the reservoir liquid level pressure at the reservoir between the upper and lower reservoirs is equal. The production pressure difference between layers and the gas-seeking time between layers are not necessary to be equal. And the size of the difference is related to the reservoir layer difference, interlayer spacing, and whether the reservoir is exposed. In addition, the difference in gas-seeking time between layers is also affected by the gas well production pressure difference. The research results provide a theoretical basis for the development of the drainage system of the coalbed methane combined production well and the selection of simulation experiment methods for combined production of coalbed methane reservoirs with multiple reservoirs.

Key words: Coalbed methane, Multi-layer mining, Downhole pressure, Production pressure difference, Gas-seeking timeFoundation items:The China National Key R &, D Project(Grant No. 2016YFC0801404), The National Natural Science Foundation of China(Grant No. 51874166), The Fundamental Research Funds for the Central Universities （Grant No. 3142020022）, The Youth Project of Liaoning Provincial Department of Education (Grant No. LJ2019QL005).

中图分类号: 

  • TE243+.9

图1

多层煤层气系统示意"

图2

煤层气的产出过程"

图3

煤层气井示意"

表1

储层参数"

模拟储层压力点深度/m压力点间距/m原始储层压力/MPa垂直地应力梯度/（MPa/100 m）
1#740.0080.006.701.29
2#820.006.801.30

表2

模拟参数的选取"

降压次数P1P2P液1P液2ΔP1ΔP2是否开始模拟
16.706.806.306.800.400.00否
26.306.805.906.400.400.40是
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