西南石油大学学报(自然科学版)

• 石油与天然气工程 • 上一篇    下一篇

低渗透压裂井非对称区域三线性渗流模型

贾永禄1,邓祺1 *,聂仁仕1,蔡明金2,王一丞3   

  1. 1.“油气藏地质及开发工程”国家重点实验室· 西南石油大学,四川成都610500
    2. 中国石油塔里木油田分公司勘探开发研究院测井中心,新疆库尔勒841000
    3. 中国石油西南油气田公司重庆气矿,重庆江北400021
  • 出版日期:2016-04-11 发布日期:2016-04-11
  • 通讯作者: 邓祺,E-mail:dengqigiggs@163.com
  • 基金资助:

    国家自然科学基金(51304164);国家重点基础研究发展计划(973 计划)(2014CB239205);高等学校博士学科点专项科研基金(新教师
    类)(20135121120001);四川省科学技术厅基础研究项目(2015JY0132)。

Trilinear-flow Model of Fractured Well on Asymmetric Regions for#br# Low-Permeability Reservoir

JIA Yonglu1, DENG Qi1*, NIE Renshi1, CAI Mingjin2, WANG Yicheng3   

  1. 1. State Key Laboratory of Oil-Gas Reservoir Geology & Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500,China
    2. Well Logging Center,Exploration and Development Research Institute,Tarim Oilfield,PetroChina,Korla,Xinjiang 841000,China
    3. Chongqing Division of Southwest Oil & Gas Field Company,PetroChina,Jiangbei,Chongqing 400021,China
  • Online:2016-04-11 Published:2016-04-11

摘要:

建立了低渗透压裂井非对称区域三线性渗流模型,与传统的理想对称区域模型相比,新模型考虑了更为复杂
的模型条件——考虑启动压力梯度和各种非对称边界组合的影响。利用拉普拉斯变换对模型进行了求解,得到了井
底压力在拉普拉斯空间的表达式,再利用数值反演,获得了试井分析样版曲线。新模型试井样版曲线与传统模型明显
不同:考虑启动压力梯度的压力及压力导数曲线后期呈上升趋势,启动压力梯度越大,曲线上升时间越早、上升位置
越高;非对称区域边界条数以及边界与压裂裂缝的相对位置(垂直或平行)对试井曲线有显著的影响,边界条数越多,
上翘幅度越大;相同情况下(边界类型和无因次边界距离相同)不同位置(垂直或平行)的边界反映在曲线上存在明显
差异。

关键词: 压裂井, 启动压力梯度, 非对称区域, 试井, 样版曲线

Abstract:

A trilinear-flow model of fractured well on asymmetric regions for low-permeability reservoir is established. Different
fromthe traditional model,the new model takes into account more complex conditions:the impact of threshold pressure
gradient and multiple asymmetric boundaries. The model is solved using Laplace transformation,and the bottom pressure in
the Laplace space is obtained. Type curves of well test are programmed and plotted by the numerical conversion. The type
curves of the new model are obviously different from the traditional one. The differences are as follows:the curves of dimensionless
pressure and pressure derivation climb up at the later stage because of the threshold pressure gradient,and the greater
the threshold gradient is the earlier and higher the curves climb up;the number of boundaries on asymmetric regions and the
relative positions(vertical or parallel)of fracturing fractures and boundaries have a remarkable influence on the typical curves
with low-permeability wells with vertical fractures. The more boundaries there are,the higher the curves climb up,and under
the same circumstances(with the same boundary types and the same dimensionless boundary distance),significant differences
exist on the curves of boundary response different relative position(vertical or parallel)

Key words: fractured well, threshold pressure gradient, asymmetric regions, well testing, type curve

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