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天然气地球科学

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裂缝气藏水侵机理及对开发影响实验研究

胡勇1,2，李熙喆1,2，万玉金1,2，焦春艳1,2，徐轩1,2，郭长敏1,2，敬伟3   

  1. 1.中国石油勘探开发研究院廊坊分院，河北 廊坊 065007；
    2.中国石油天然气集团公司天然气成藏与开发重点实验室，河北 廊坊 065007;
    3.中国石油青海油田分公司勘探开发研究院，甘肃 敦煌 736200
  • 收稿日期:2015-07-07 修回日期:2015-09-04 出版日期:2016-05-10 发布日期:2016-05-10
  • 作者简介:胡勇(1978-)，男，重庆人，高级工程师，在读博士，主要从事石油天然气开发与实验研究. E-mail: huy69@petrochina.com.cn.
  • 基金资助:
    国家科技重大专项项目“致密砂岩气有效开发评价技术”(编号:2011ZX05013-002)资助.

The experimental study of water invasion mechanism in fracture and the influence on the development of gas reservoir

Hu Yong1,2，Li Xi-zhe1,2，Wan Yu-jin1,2，Jiao Chun-yan1,2，Xu Xuan1,2，Guo Chang-min1,2，Jing Wei3   

  1. 1.Langfang Branch,Research Institute of Exploration and Development,PetroChina，Langfang 065007,China;
    2.The Key Laboratory of Gas Reservoir Formation and Development,Langfang 065007,China;
    3.Petrochina Qinhai Oilfield Company,Dunhuang 736200,China
  • Received:2015-07-07 Revised:2015-09-04 Online:2016-05-10 Published:2016-05-10

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摘要： 针对裂缝—孔隙型气藏水侵规律及影响气藏采出程度机理的认识难题，采用物理模拟实验技术，开展了贯通水平裂缝条件下的水侵规律实验、储层基质渗吸水实验以及储层基质渗吸水后对储层供气机理的影响实验，明确了储层基质水侵与裂缝水侵的区别，认识了裂缝—孔隙型边底水气藏水侵规律及其对气藏产能以及采收率的影响机理，即裂缝水侵过程中边底水会沿裂缝快速突进、同时储层基质会渗吸水、基质渗吸水后减少气相渗流通道，从而增加储层基质气相渗流阻力，降低气藏稳产能力和最终采出程度，该项机理认识揭示了裂缝气藏水侵后导致气井产量、最终采出程度大幅度下降的主要原因。在上述机理认识基础上，进一步研究了贯通裂缝水侵前沿推进速度与储层物性、水体大小的关系，分类测试了不同渗透率储层基质渗吸水的能力，模拟评价了不同渗吸水方式和渗吸水量对气藏储层稳产能力和最终采出程度的影响，研究成果可以为我国塔里木盆地迪那气田、克深气田以及四川盆地磨溪龙王庙气藏科学开发提供技术支持。

关键词: 裂缝—孔隙型气藏, 边底水, 水侵机理, 基质渗吸水, 实验研究

Abstract: Aimed at water invasion law in fracture-pore gas reservoir and influencing factors of recovery percent of gas reservoir,the physical simulation experiment technique was used in the water invasion law experiment of horizontal cut-through fracture,the water imbibition experiment of matrix rock and its impacts on the formation gas supply mechanism experiment.In the paper,difference between the water invasion in matrix rock and fracture is determined.The water invasion law and the influence mechanism of water invasion on gas reservoir productivity and recovery efficiency in fracture-pore edge-bottom water gas reservoir was acquired.In the process of the water invasion into the fractured gas reservoir,while the water is invading into the fracture fast,the water is imbibing into the matrix rock which will result in reduction of gas phase percolation roads,increase of the gas phase percolation resistance of matrix rock and reduction of gas reservoir productivity and ultimate recovery percent of gas reservoir.The knowledge revealed the reduction causes of the gas well productivity and the recovery ratio of gas reservoir after water invasion into the fractured gas reservoir.Based on the above knowledge,the relation of water encroachment frontier advance rate and formation physical property,water body size was studied further.The different permeability matrix rock imbibition capacity was tested.The influence of water imbibition style and imbibition volume on the stable yield and ultimate recovery percent of reserves is evaluated.The study achievements can provide technical support for the development of Dina and Keshen gas reservoir of Tarim Basin and Longwangmiao gas reservoirs in the Moxi block of Sichuan Basin.

Key words: Fracture-pore gas reservoir, Edge-bottom water, Water invasion mechanism, Water imbibition into the matrix rock, Experimental study

中图分类号: 

  • TE122.2+3

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