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天然气地球科学

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应力敏感碳酸盐岩复合气藏生产动态特征分析

孟凡坤,雷群，徐伟，何东博，闫海军，邓惠   

  1. 1.中国石油勘探开发研究院，北京 100083）
    2.中国石油西南油气田分公司勘探开发研究院，四川 成都 610051
  • 收稿日期:2017-11-24 修回日期:2018-02-06 出版日期:2018-03-10 发布日期:2018-03-10
  • 作者简介:孟凡坤（1990-），男，山东阳信人，博士研究生，主要从事碳酸盐岩气藏产能评价与数值模拟、注气提高采收率研究.E-mail：mengfk09021021@163.com.
  • 基金资助:
    "十三五”国家科技重大专项“深层碳酸盐岩气藏高效开发技术”（编号：2016ZX05015-003）；中国石油集团重大科技专项“川中地区灯四气藏规模有效开发关键技术研究与应用”（编号:2016E-0606）联合资助.
     

Production performance analysis for stress-sensitive and composite carbonate gas reservoirs

Meng Fan-kun,Lei Qun,Xu Wei,He Dong-bo,Yan Hai-jun,Deng Hui   

  1. 1.PetroChina Research Institute of Petroleum Exploration & Development,Beijing 100083,China;
    2.Exploration and Development Research Institule,PetroChina Southwest Oil & Gas Filed  Company,Chengdu 61001,China
  • Received:2017-11-24 Revised:2018-02-06 Online:2018-03-10 Published:2018-03-10

PDF (PC)

476

摘要：

针对碳酸盐岩气藏平面非均质严重、应力敏感性强的特点，基于近井带裂缝—溶洞发育、远井带基质广泛展布的地质特征，将储层划分为内、外2个区，内区为三重孔隙介质，外区为单重孔隙介质；通过开展应力敏感性试验，确定内区裂缝渗透率应力敏感性变化规律，并引入拟压力及拟时间函数加以描述，建立考虑储层应力敏感特性的碳酸盐岩复合气藏渗流数学模型。应用Laplace变换及Stehfest数值反演方法，并结合气藏物质平衡方程，迭代求取定产压力解和定压产量解。采用矿场实际储层、流体及生产数据，对模型的有效性进行验证。分析不同应力敏感系数、内区裂缝渗透率及外区基质渗透率等对生产动态的影响特征，研究结果表明气井初始产量及生产后期压力随应力敏感系数的增大而减小，相比与内区裂缝渗透率，外区基质渗透率决定气井产气能力、井底流压大小与下降速率。

关键词: 碳酸盐岩气藏, 复合模型, 应力敏感, 裂缝渗透率, 基质渗透率, 生产动态

Abstract:

In carbonate reservoirs,the formation heterogeneity and stress-sensitivity effects are so strong that it is difficult to predict well production performance accurately.It was believed that fractures and vugs were abundant around wellbore,while the places far from wellbore contained matrix only.Therefore,the reservoirs could be divided into two regions,inner region and outer region,which could be represented by triple and single porosity media.The relationship between natural fractures permeability and effective stress could be determined through laboratory experiments,and pseudo-pressure and pseudo-time were introduced to consider this effect.Then a semi-analytical model was proposed to evaluate the production performance in stress-sensitive and composite carbonate gas reservoirs.The methods of Laplace transformation,Stehfest numerical inversion and material balance equation of gas reservoirs were used to compute the bottom-hole pressure and production rate for wells with constant production rate or bottom-hole pressure.The validity of the model was verified by comparing the calculated results and field data for two cases.The effects of stress-sensitive factors,natural fractures permeability and matrix permeability of outer region on production performance were analyzed.The results demonstrate that the initial production rate and bottom-hole pressure in later period decrease with the stress-sensitive factors.Compared with fracture permeability,the matrix permeability of outer region have significant impacts on gas well productivity,the level and the declination rate of bottom-hole pressure.

Key words: Carbonate gas reservoirs, Composite model, Stress sensitivity, Natural fractures permeability, Matrix permeability, Production performance

中图分类号: 

  • TE371

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