特种油气藏 ›› 2021, Vol. 28 ›› Issue (4): 123-128.DOI: 10.3969/j.issn.1006-6535.2021.04.017

• 油藏工程 • 上一篇    下一篇

动态渗吸对超低渗透油藏开发的影响及应用

胡亚斐1, 李军诗2, 胡水清1, 吴峙颖1,3, 姜晶4, 董宁5, 胡泊旸6, 吕彦兵7   

  1. 1.中国石油勘探开发研究院,北京 100083;
    2.中国石油咨询中心,北京 100120;
    3.中国石化石油工程技术研究院,北京 100101;
    4.中海石油中国有限公司天津分公司,天津 300459;
    5.天津昆仑燃气有限公司,天津 300459;
    6.中国石油技术开发有限公司,北京 100028;
    7.中国石油华北油田分公司,山西 晋城 048203
  • 收稿日期:2020-04-27 修回日期:2021-05-17 发布日期:2022-02-18
  • 作者简介:胡亚斐(1987—),女,工程师,2009年毕业于西南石油大学石油工程专业,2012年毕业于中国石油大学(北京)油气田开发专业,获硕士学位,现从事低渗透油气田开发工作。
  • 基金资助:
    中国石油科学研究与技术开发项目“低渗透油田水驱控递减关键技术研究与应用” (kt2018-11-02-01)

Influence and Application of Dynamic Imbibition on the Development of Ultra-low Permeability Reservoirs

Hu Yafei1, Li Junshi2, Hu Shuiqing1, Wu Zhiying1,3, Jiang Jing4, Dong Ning5, Hu Boyang6, Lyu Yanbing7   

  1. 1. Research Institute of Petroleum Exploration & Development, Beijing 100083, China;
    2. CNPC Counseling Center, Beijing 100120, China;
    3. Sinopec Research Institute of Petroleum Engineering, Beijing 100101, China;
    4. CNOOC Tianjin Branch, Tianjin 300459, China;
    5. Tianjin Kunlun Gas Co., Ltd., Tianjin 300459, China;
    6. China Petroleum Technology and Development Corporation, Beijing 100028, China;
    7. PetroChina Huabei Oilfield Company, Jincheng, Shanxi 048203, China
  • Received:2020-04-27 Revised:2021-05-17 Published:2022-02-18

摘要: 针对超低渗透油藏渗透率低、孔喉结构复杂、非均质性强、常规注水难以建立有效驱替、裂缝-基质间渗吸作用强等问题,运用室内渗吸实验和相似理论,在分析超低渗透油藏动态渗吸驱油机理的基础上,得到动态渗吸特征及主要影响因素,并将实验室数据应用到油田现场。实验结果表明:影响超低渗透油藏动态渗吸的主要因素包括润湿性、注入速度、裂缝密度、吞吐周期等。其中,润湿性是渗吸的主要影响因素,岩石亲水性越强,渗透率越高,裂缝越多,动态渗吸效果越好;适合超低渗透油藏开发的注水速度为0.1 mL/min;合理吞吐周期为2~3个,优化闷井时间为30 d左右。矿场试验表明,鄂尔多斯盆地A油田5口水平井进行体积压裂并利用动态渗吸采油后,平均含水下降20个百分点,5口水平井累计增油2 145 t,效果显著。研究成果对超低渗透油田生产方案的制订有指导意义。

关键词: 超低渗透油藏, 动态渗吸, 渗吸采收率, 吞吐轮次, 闷井时间, 长庆油田

Abstract: In view of low permeability in ultra-low permeability reservoirs, complex pore throat structure, high heterogeneity, difficulty in realizing effective displacement with conventional water injection, strong imbibition between fractures and matrixes, and other problems, dynamic imbibition characteristics and main influencing factors were worked out by indoor imbibition experiments and similar theories on the basis of the mechanism analysis of dynamic imbibition and oil displacement in ultra-low permeability reservoirs, and the laboratory data were applied to the oilfield site. As indicated by experimental results, the main factors affecting dynamic imbibition in ultra-low permeability reservoirs included wettability, injection rate, fracture density, and stimulation turns. Among them, wettability was the primary factor affecting the imbibition. The stronger the hydrophilicity of the rock, the higher the permeability, the more fractures, and the better the dynamic imbibition effect; the water injection rate suitable for the development of ultra-low permeability reservoir was 0.1 mL/min; the reasonable stimulation turn was 2 to 3 cycles, and the optimal shut-in duration was about 30 days. The significant effect of dynamic imbibition was proven by the field tests where the average water cut was reduced by 20 percentage points, and the cumulative oil production was increased by 2 145 t in 5 horizontal wells after fracturing by stimulated reservoir volume and dynamic imbibition in Oilfield A, Ordos Basin. The study results play a guiding role in the formulation of production scheme of ultra-low permeability oilfields.

Key words: ultra-low permeability reservoirs, dynamic imbibition, imbibition recovery efficiency, huff and puff, shut-in duration, Changqing Oilfield

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