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苏里格低渗透砂岩气藏束缚水饱和度研究 预览 被引量:9

RESEARCHES ON IRREDUCIBLE WATER SATURATION OF LOW-PERMEABILITY SANDSTONE GAS RESERVOIR IN SULIGE GASFIELD
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摘要 束缚水饱和度是低渗透砂岩气藏储层评价的重要指标参数。利用非稳态恒压气驱法结合核磁共振T:谱技术,研究了苏里格盒8段低渗透砂岩气藏岩心在不同气驱条件下含水饱和度的变化情况及束缚水饱和度建立过程。研究结果表明:在平均驱替压差下气驱驱替孔隙体积倍数达到50左右时岩心内含水分布状态趋于稳定,达到束缚水状态;气驱不同阶段的含水饱和度与平均驱替压差下驱替体积倍数、驱替时间之间存在极好的相关性;岩心达到束缚水状态所用的驱替时间是随着驱替压差和渗透率差异而改变的,不能作为衡量是否达到束缚水状态的依据;随着气驱压差的增大,气驱不同阶段的含水饱和度和束缚水饱和度都趋于减小,但减小幅度较小。气驱法建立的束缚水饱和度与离心法束缚水饱和度吻合较好,综合两种实验方法可较准确地给出苏里格低渗透砂岩气藏岩心的束缚水饱和度。 Irreducible water saturation is one of the important parameters for low-permeability sandstone gas reser- voir evaluation. With the help of unsteady-state constant pressure gas driving method combined with nuclear magnetic resonance ( NMR) T2 spectrum technology the changes of the water saturation and the establishment process of the irreducible water saturation for the low-permeability sandstone gas reservoirg cores are studied under different gas flooding conditions in He8 Member of Sulige Gasfield. The research results show that the water distribution state is prone to be stable and up to irreducible water situation after injecting about 50 pore volume displaced multiples { PV) under the average pressure differential; there are excellent correlation between the water saturations in differ- ent stages of gas drive and PV and displacement time under the average pressure differential ; The displacement time to form irreducible water state changes with different displacement pressure and permeability differentials, so it can the evidence to judge whether the irreducible water state is formed or not. With the increase of the displacement pressure differential, the { irreducible) water saturations at different stages of gas drive all tend to decrease, but the degree are limited. There is much better coincidence in the irreducible water saturations established by gas drive method and centrifugal method. The irreducible water saturations of low-permeability sandstone gas reservoirs in Su- lige can be accurately obtained by the integration of above two experimental methods.
作者 郭和坤 刘建坤 李太伟 雷琛 薛小佳 李振涛 GUO Hekun1'2 , LIU Jiankun , LI Taiwei , LEI Chen3 , XUE Xiaojia4 , LI Zhentao1 ( 1. Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, China ; 2. Langfang Branch of PetroChina Research Institute of Exploration and Development, Langfang 065007, China ; 3. No. 3 Oil Production Plant of PetroChina Changqing Oilfield Branch Company, Yinchuan 750006, China; 4. Research Institute of Oil and Gas Technology, PetroChina Changqing Oilfield Branch Company, Xi' an 710021, China)
出处 《大庆石油地质与开发》 CAS CSCD 北大核心 2012年第2期 91-97,共7页 Petroleum Geology & Oilfield Development in Daqing
基金 国家自然科学基金项目“低渗透气藏储层特征及流体运动渗流机理研究”(10672187)资助.
关键词 低渗透 砂岩气藏 束缚水饱和度 非稳态 气驱 核磁共振 驱替体积倍数 离心法 low permeability sandstone gas reservoir irreducible water saturation unsteady state gas drive NMR pore volume displaced multiple (PV) centrifugal method
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