岩性油气藏 ›› 2017, Vol. 29 ›› Issue (6): 119–127.doi: 10.3969/j.issn.1673-8926.2017.06.015

• 油气田开发 • 上一篇    下一篇

低渗透油藏CO2吞吐压力响应曲线分析

李友全1, 韩秀虹2, 阎燕1, 张德志1, 周志为2, 孟凡坤3   

  1. 1. 中国石化胜利油田分公司 勘探开发研究院, 山东 东营 257015;
    2. 中国石油大学(华东)石油工程学院, 山东 青岛 266580;
    3. 中国石油勘探开发研究院, 北京 100083
  • 收稿日期:2017-05-03 修回日期:2017-07-12 出版日期:2017-11-21 发布日期:2017-11-21
  • 作者简介:李友全(1970-),男,硕士,高级工程师,主要从事试井及高压物性实验方面的研究工作。地址:(257015)山东省东营市东营区聊城路2号。Email:liyouquan.slyt@Sinopec.com。
  • 基金资助:
    国家自然科学基金项目"页岩油多尺度运移机制及数值模拟"（编号：51674279）资助

Pressure transient analysis on CO2 huff and puff in low permeability reservoir

LI Youquan1, HAN Xiuhong2, YAN Yan1, ZHANG Dezhi1, ZHOU Zhiwei2, MENG Fankun3   

  1. 1. Research Institute of Exploration and Development, Sinopec Shengli Oilfield Company, Dongying 257015, Shandong, China;
    2. College of Petroleum Engineering, China University of Petroleum, Qingdao 266580, Shandong, China;
    3. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China
  • Received:2017-05-03 Revised:2017-07-12 Online:2017-11-21 Published:2017-11-21

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摘要： CO2吞吐是低渗透油藏提高采收率的一种重要方式，但是目前对吞吐过程中的压力响应认识不足。低渗透油藏注入CO2后，黏度等流体性质随CO2浓度分布变化而产生平面非均质现象。为了表征低渗透条件下的压力动态，基于Fick定律求解CO2浓度分布来反映流体的性质差异，在达西渗流方程中引入渗透率模数和启动压力梯度来反映油藏的低渗透特性，通过黏度耦合浓度方程和渗流方程，建立了低渗透油藏CO2吞吐压力响应模型，采用数值方法对模型进行求解，并通过解析方法和数值模拟对模型可靠性进行了验证，最后分析了低渗透特性参数以及CO2浓度相关参数对压力响应曲线的影响。研究结果表明：启动压力梯度越大，CO2注入压力越大，压力及压力导数曲线斜率也越大；渗透率模数越大，压力及压力导数曲线末期斜率越小；CO2注入速度越快，其注入压力越大，浓度扩散越快，波及区与未波及区的界限越明显；CO2扩散系数越大，储层流体性质的非均质性越小，波及区与未波及区界限越不明显。该模型可应用于低渗透油藏CO2吞吐注入过程试井分析、地层参数预测以及CO2浓度分布动态分析。

关键词: 砂砾岩储层, 黄铁矿, 识别图版, 等效体积模型, 齐古组, 准噶尔盆地

Abstract: CO2 huff and puff are important way to improve oil recovery in low permeability reservoir. However, the recognition of the pressure response performance is not clear. After the injection of CO2 in low permeability reservoir,the fluid properties such as viscosity vary with the CO2 concentration,resulting in the phenomenon of plane heterogeneity. In order to characterize the pressure transient, the CO2 concentration distribution was obtained based on Fick's law to characterize the fluid property. The permeability modulus and starting pressure gradient were introduced in Darcy flow equation to characterize the low permeability characteristics. The pressure response model for CO2 huff and puff in low permeability reservoir was established by viscosity coupling concentration equation and flow equation,and it was solved by numerical method. The reliability of the model was verified by analytical method and numerical simulation, and finally the influences of low permeability properties and CO2 concentration on the pressure response curve were analyzed. The results show that the increase of starting-up pressure gradient leads to higher CO2 injection pressure and the rise of pressure and pressure derivative curve slope. The pressure and pressure derivative curve slope become smaller with the increase of the permeability modulus. The diffusion of CO2becomes faster while increasing the injection rate of CO2,and the injection pressure becomes larger,at the same time,the boundary between swept area and unswept area is clearer. As the diffusion efficient of CO2 increases,the difference of fluid properties in difference place becomes smaller and the boundary between swept area and unswept area is not clear. This model can be applied to well testing of CO2 huff and puff process in low permeability reservoir, the prediction of reservoir parameter and analysis of CO2 concentration distribution.

Key words: glutenite reservoirs, pyrite, identification chart, equivalent volume model, Qigu Formation, Junggar Basin

中图分类号: 

  • TE348
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