西南石油大学学报(自然科学版)

• 博导论评 • 上一篇    

不同类型致密气层对产能贡献的实验评价方法

唐洪明1,2,冯于恬2,何溥为2,张烈辉1,赵峰2   

  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. 西南石油大学地球科学与技术学院,四川成都610500
  • 出版日期:2014-08-01 发布日期:2014-08-01
  • 基金资助:

    国家杰出青年基金(51125019);青年基金(51304167)。

Experimental Methods for Evaluating Productivity Contribution of Different Types of Low Permeability Gas Reservoir

Tang Hongming1,2, Feng Yutian2, He Puwei2, Zhang Liehui1, Zhao Feng2   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500,China
    2. School of Geoscience and Technology,Southwest Petroleum University,Chengdu,Sichuan 610500,China
  • Online:2014-08-01 Published:2014-08-01

摘要:

针对在建立岩芯含水饱和度时,用地层水饱和经常出现盐析、用无离子水饱和会导致水敏/盐敏损害等问题,提出将岩芯进行550 ℃高温处理2 h,钝化气层中的水/盐敏性黏土矿物,再使用无离子水建立不同含水饱和度开展评价实验,能有效消除此类实验误差;且岩芯可以重复实验,既克服了岩芯非均质性带来的误差,又能节约大量的珍贵岩芯。以四川盆地合川须二低渗气层I、II、III 类气层为研究对象,利用该方法评价了不同类型气层对产能的贡献率,研究表明高温处理后岩芯没有产生微裂缝,绝对渗透率下降5% 左右。

关键词: 致密气层, 产能, 贡献率, 黏土钝化, 实验评价

Abstract:

When establishing water saturations in cores,salting-out may occur when using the formation water,and there may be the water/salt sensitivity damages in the process of the deionized water saturation. Those problems bring errors to the experimental results. The present paper provides a method to eliminate the experimental error:by heating the core sample under 550 ℃ for 2 h,passivating the water/salt sensitive clay minerals,and then using the deionized water to build various water saturations during the evaluation experiments,Thus the errors caused by core heterogeneity can be avoided. Besides,the experiment can be proceeded on the same core sample repeatedly. Using this method,we evaluated the productivity contribution rate of the low permeability gas reservoirs of types I,II and III in Member 2 of Xujiahe Formation in Upper Triassic,Hechuan Area,Sichuan Basin. The results show that there is no obvious micro cracks produced after high temperature treatment and the deviation range of permeability is less than 5%.

Key words: low permeability gas reservoirs, productivity, contribution rate, clay mineral passivation, experimental evaluation