西南石油大学学报(自然科学版) ›› 2019, Vol. 41 ›› Issue (2): 143-151.DOI: 10.11885/j.issn.1674-5086.2018.07.27.01

• 石油与天然气工程 • 上一篇    下一篇

水平井、直井联合开发压力场及流线分布研究

祖琳   

  1. 中国石油大庆油田有限责任公司勘探开发研究院, 黑龙江 大庆 163712
  • 收稿日期:2018-07-27 出版日期:2019-04-10 发布日期:2019-04-10
  • 通讯作者: 祖琳,E-mail:zulin@petrochina.com.cn
  • 作者简介:祖琳,1985年生,女,汉族,黑龙江大庆人,工程师,主要从事水平井开发和数值模拟研究。E-mail:zulin@petrochina.com.cn
  • 基金资助:
    国家科技重大专项(2017ZX05013006);中国石油股份公司十三五重大专项(2016E-0209)

Pressure Field and Streamline Distribution of Jointly Developed Horizontal and Vertical Wells

ZU Lin   

  1. Petrochina Daqing Oilfield Limited Company Institute of Exploration and Development, Daqing, Heilongjiang 163712, China
  • Received:2018-07-27 Online:2019-04-10 Published:2019-04-10

摘要: 针对目前大庆长垣外围低产低效水平井比例较高,亟待开展水平井井组剩余油分布特征规律研究等问题,开展了水平井、直井联合开发注采井网流线和压力分布特征研究。应用源汇理论及压力叠加原理,建立直井、水平井、压裂水平井以及直井与水平井联合开发压力场模型,采用Euler方法对模型进行了求解,模拟了二注、三注和四注3种井网形式的压力场和流线分布。研究表明,不同完井方式水平井组压力场和流线分布特征主要规律一致;水井位于正对水平井的边井位置处,水井与水平井之间易形成线性推进;水井位于非正对水平井的角井位置处,不易形成线性推进,形成大面积的低压力区域;压裂水平井特别之处在于,水井非正对水平井时外侧裂缝压力梯度场大于内侧裂缝。通过与实际井组数值模拟研究的剩余油结果对比,进一步验证了研究结论的准确性,最终达到指导水平井组剩余油分布特征研究及开发调整的目的。

关键词: 水平井、直井联合开发, 压力叠加原理, 压力场, 流线分布

Abstract: Considering the current high proportion of low-yield and low-efficiency horizontal wells around Daqing Placanticline, research on the characteristics of residual oil distribution in horizontal well groups is urgently required. Thus, this study focuses on the flood pattern streamlines and pressure distribution characteristics of jointly developed horizontal and vertical wells. Through the application of the source-sink theory and the superposition principle for pressure, pressure field models with only vertical wells, only horizontal wells, only fracturing horizontal wells, and jointly developed vertical/horizontal wells were constructed. The Euler method was used to solve these models, where two, three, and four nodes formed the well network used in simulation to obtain the pressure field and streamline distribution. The research shows that the major trends of pressure fields and streamline distribution in horizontal wells when different network completion methods are applied were the same. When the wells were located at side wells, which are directly opposite to the horizontal wells, linear progression was easily formed between the wells and horizontal wells. When the wells were located at corner wells, which were thus not directly opposite the horizontal wells, linear progression could not be formed easily and resulted in a large area of low pressure. The distinct feature of fracturing horizontal wells is that the pressure gradient field of the outer crack is larger than that of the inner crack when the well is not directly opposite the horizontal wells. The accuracy of this study's results was further verified by comparison with the residual oil results of the well group numerical simulation. These results will help to fulfill the purpose of guiding the research and development adjustment of the residual oil distribution characteristics of the horizontal well group.

Key words: joint development of horizontal and vertical wells, pressure superposition principle, pressure field, streamline distribution

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