水平井二维稳定渗流场分析及应用

doi:10.11885/j.issn.1674-5086.2017.11.04.01

摘要/Abstract

摘要： 通过保角变换把水平井二维渗流场转换为直井二维渗流场，分析水平井二维稳定渗流场，推导出水平井二维稳定渗流场中的渗流速度参数方程，进而根据水平井产能公式和水平井二维稳定渗流场中的渗流速度参数方程优化水平井水平段长度和水平段方向。通过绘制水平井和垂直注水井不同方位组合的一注一采井网流线分布图，优化水平井和垂直注水井的最佳相对位置。结果表明，常规薄层油藏的水平井生产井段长度不宜大于100 m。应用水平井开发具有气顶或边水的油藏时，水平段应与油藏的构造线相平行，使水平井二维渗流场中的主流线方向避开气窜方向和边水锥进方向；在水平井和垂直注水井一注一采井网中，通过对比流场分布图明确垂直注水井的最佳位置在水平井的中垂线上。

关键词: 保角变换, 渗流, 水平井, 流线, 井网

Abstract: Two-dimensional porous-flow fields of horizontal wells were transformed to two-dimensional porous-flow fields of straight wells by performing conformal transformation, to analyze two-dimensional steady-state porous-flow fields of horizontal wells. A parametric equation for porous-flow velocity in two-dimensional steady-state porous-flow fields of horizontal wells was derived and was used together with an equation for computing the capacity of horizontal wells to optimize the length and direction of horizontal sections of horizontal wells. The relative positioning of horizontal wells and straight water-injection wells was optimized by graphically rendering the streamline distribution of one-injection-one-production well patterns of different combinations of positioning of horizontal wells and straight water-injection wells. The results show that the length of production sections of horizontal wells for normal thin-layer oil reservoirs should be less than 100 m. When horizontal wells are used to recover oil reservoirs with gas caps or edge water, the horizontal sections should be parallel to the structural line of the reservoir to keep the direction of the main streamlines of the two-dimensional porous-flow fields of horizontal wells away from the direction of gas channeling and edge water coning. For one-injection-one-production well patterns consisting of horizontal wells and straight water-injection wells, a comparison against the graphical flow field distribution reveals that the optimum position of straight water-injection wells is on the perpendicular bisector of horizontal wells.

Key words: conformal transformation, porous flow, horizontal well, streamline, well pattern

中图分类号:

TE312

玄建. 水平井二维稳定渗流场分析及应用[J]. 西南石油大学学报(自然科学版), 2018, 40(3): 115-120.

XUAN Jian. Analysis and Application of Two-dimensional Steady-state Porous-flow Fields of Horizontal Wells[J]. 西南石油大学学报(自然科学版), 2018, 40(3): 115-120.

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http://journal15.magtechjournal.com/Jwk_xnzk/CN/Y2018/V40/I3/115

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