低渗油藏水平井产能计算方法研究

文档编号:JD1132  文档字数:10310,页数:33

低渗油藏水平井产能计算方法研究
 摘 要
 低渗透油田具有物性差，开采难度大，产量低的特点，利用水平井开发低渗透油田，可以有效提高单井产量，增加可采储量。对于低渗透油藏水平井产能的研究目前还比较少，本文在深入调研了国内外有关水平井产能预测理文档献的基础上，以水平井单相流为研究对象，对水平井开采低渗透油藏的产能问题进行了研究。文中首先从渗流力学基础理论出发，对低渗透油藏条件下的渗流速度、压力等渗流参数进行了分析，重新定义的低渗透油藏产能的公式与启动压力梯度有关；然后利用等值渗流阻力法、保角变换等数学物理方法，推导了考虑启动压力梯度条件下水平井单井的稳定渗流产量公式，并分析了启动压力梯度、水平井长度、油层厚度、表皮因子等因素对水平井产能的影响；第三章中推导了两种不同储层条件下的水平井非达西稳态渗流方程。
 
 关键词：水平井；低渗透油藏；产能；启动压力梯度
 
 
  Abstract
 Low permeability reservoirs has characteristics of difficult exploitation and low productivity. As a new technology in recent years, horizontal well can effectively improve oil recovery, it has been applied to all kinds of reservoirs successfully. Application of horizontal well to develop low permeability reservoirs, can effectively improve single well productivity and increased recoverable reserves. Based on thorough investigation and relevant theory of horizontal productivity prediction, the horizontal well productivity of low permeability reservoirs is studied in this thesis. First of all, some seepage parameters were analyzed under the condition of low permeability reservoirs, such as flow velocity, pressure. The redefined productivity is the function of threshold pressure gradient. Then using law of equivalent percolation resistance and conformal transformation, horizontal well stable seepage productivity formula for conditions of the threshold pressure gradient were derived and partial productivity influential factors were analyzed. In chapter three, horizontal well non-darcy steady flow productivity formula for two different reservoir’ conditions were derived.

 Keywords: horizontal well; low permeability reservoir; productivity; threshold pressure gradient
 
 
  目 录
 第一章 绪 论 1
 1.1 任务的提出 1
 1.2 研究目的及意义 1
 1.3 国内外研究现状 2
 1.3.1 国外研究现状 2
 1.3.2 国内研究现状 3
 1.4本文研究内容及技术路线 5
 1.4.1 本文研究内容 5
 1.4.2 本文技术路线 5
 第二章 低速非达西稳定渗流理论 6
 2.1 渗流特征分析 6
 2.2 渗流数学模型 6
 第三章 建立针对性水平井产能模型 8
 3.1 无限大储层水平井单井产能模型 8
 3.2 封闭储层水平井单井产能模型 15
 第四章 水平井产能敏感因素分析 18
 4.1 启动压力梯度的影响 18
 4.2 水平井长度的影响 19
 4.3 油藏厚度的影响 19
 4.4 生产压差的影响 20
 4.5 渗透率各向异性的影响 21
 4.6 表皮因子的影响 22
 第五章 模型可靠性分析 24
 第六章 结 论 25
 致 谢 26
 主要参考文献 27
 附 录 29

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