西南石油大学学报(自然科学版) ›› 2002, Vol. 24 ›› Issue (5): 34- 36.DOI: 10.3863/j.issn.1000-2634.2002.05.011

• 石油工程 • 上一篇    下一篇

倾斜多层油藏注N2 非混相驱合理注气速度研究

熊钰1 孙良田1 孙雷1 潘晓霞2 赵明3
  

  1. 1. 西南石油学院,四川南充637001 ; 2. 江苏油田分公司研究院; 3. 大港油田公司勘探开发技术研究中心
  • 收稿日期:2002-01-21 修回日期:1900-01-01 出版日期:2002-10-20 发布日期:2002-10-20
  • 通讯作者: 熊钰

REASONABLE VELOCITY OF N2 INJECTION NONMISCI2 BLE FLOODING IN TILTINGMULTILAYER RESERVOIR

XIONG Yu SUN Liang-tian SUN Lei PAN Xiao-xia ZHAO Ming   

  1. Southwest Petroleum Institute , NanchongSichuan 637001 , China
  • Received:2002-01-21 Revised:1900-01-01 Online:2002-10-20 Published:2002-10-20
  • Contact: XIONG Yu

摘要: 注气速度对非混相驱的采收率有很大的影响。在注气非混相驱的二维驱替理论模型的基础上,分析了注水开发后单一储层注N2 非混相驱界面稳定条件,给出了倾斜多层油藏注水开发后注气非混相驱考虑渗透率级差和有效吸气厚度影响的合理注N2 速度界限的确定和注气动态分析方法,并对某实际油藏剖面进行注氮动态分析,用数值模拟进行了对比分析验证。结果表明:所给出的合理注气速度界限的确定方法和倾斜多层油藏的注N2 动态分析方法是合理的。
 

关键词: 非混相驱, 稳定性, 提高采收率, 注气

Abstract: Gas injection velocity has strong effected on oil recovery fornonOmiscible flooding. Based on theoretical model of twoOdimensional displacement in porous media and interface stability condition of N2 nonOmiscible flooding after waterflooding , the determination method of reasonable N2 injection velocity limit and the performance analysis ways as to tilting multilayer reservoir have been presented in this paper by taking both permeability and effective gas imbibition thickness into account . It has been found that reasonable N2 injection velocity is proportional to the product of permeability by effective gas imbibition thickness , and reasonable N2 injection velocity must be less than minimum value of maximum N2 injection velocity in all layers.
Partial stability will occur when N2 injection velocity is greater than minimum velocity and less than maximum velocity. Oil recovery will gradually decrease in such situation. Comparing results from N2 injection performance analysis of actual reservoir with that of simulation indicated that methods presented in the paper are reasonable and effective ways for determining reasonable N2injection velocity and analyzing injection performance in tilting multilayer reservoir.

Key words: non miscible flooding, stability, EOR, gas injection

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