Measurement and Visualization of Tight Rock Exposed to CO2 Using NMR Relaxometry and MRI

被引：30

作者：

Wang, Haitao ^{[1
,2
]}

Lun, Zengmin ^{[1
,2
]}

Lv, Chengyuan ^{[1
,2
]}

Lang, Dongjiang ^{[1
,2
]}

Ji, Bingyu ^{[1
,2
]}

Luo, Ming ^{[1
,2
]}

Pan, Weiyi ^{[1
,2
]}

Wang, Rui ^{[1
,2
]}

Gong, Kai ^{[1
,2
]}

机构：

[1] State Key Lab Shale Oil & Gas Enrichment Mech & E, Beijing 100083, Peoples R China

[2] Sinopec, Petr Explorat & Prod Res Inst PEPRIS, Beijing 100083, Peoples R China

来源：

SCIENTIFIC REPORTS | 2017年 / 7卷

基金：

中国国家自然科学基金;

关键词：

SUPERCRITICAL CO2; POROUS-MEDIA; MECHANISMS;

D O I：

10.1038/srep44354

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Understanding mechanisms of oil mobilization of tight matrix during CO2 injection is crucial for CO2 enhanced oil recovery (EOR) and sequestration engineering design. In this study exposure behavior between CO2 and tight rock of the Ordos Basin has been studied experimentally by using nuclear magnetic resonance transverse relaxation time (NMR T-2) spectrum and magnetic resonance imaging (MRI) under the reservoir pressure and temperature. Quantitative analysis of recovery at the pore scale and visualization of oil mobilization are achieved. Effects of CO2 injection, exposure times and pressure on recovery performance have been investigated. The experimental results indicate that oil in all pores can be gradually mobilized to the surface of rock by CO2 injection. Oil mobilization in tight rock is timeconsuming while oil on the surface of tight rock can be mobilized easily. CO2 injection can effectively mobilize oil in all pores of tight rock, especially big size pores. This understanding of process of matrix exposed to CO2 could support the CO2 EOR in tight reservoirs.

引用

页数：10

共 26 条

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