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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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        Abstract - Issue Jul 2015, 36 (4)                                                                                                             Back



nstantaneous and historical temperature effects on a-pinene

Potential evaluation of CO2 storage and enhanced oil recovery of

tight oil reservoir in the Ordos Basin, China

 

Xiaofeng Tian1*, Linsong Cheng1, Renyi Cao1, Miaoyi Zhang2, Qiang Guo3, Yimin Wang4, Jian Zhang5 and Yu Cui6

1Department of Petroleum Engineering, China University of Petroleum-Beijing, Beijing, 102249, China

2Department of Geoscience, China University of Petroleum-Beijing, Beijing, 102249, China

3Department of Petroleum Engineering, Missouri University of Science and Technology, Rolla, Missouri, 65409, USA

4Department of Engineering and Technology, Tianjin Branch of China National Offshore Oil Corporation, Tianjin, 300452, China

5Department of Australia Project Technology, Sinopec International Exploration and Production Corporation, Beijing, 100086, China

6Department of Exploration and Evaluation in Beidagang, Exploration and Development Research Institute of Dagang Oilfield Company of Petrochina, Tianjin, 300280, China

*Corresponding Author?s Email : txf5160@163.com

 

 

Publication Data

Paper received:

01 June 2014

 

Revised received:

30 September 2014

 

Re-revised received:

01 January 2015

 

Accepted:

07 February 2015

 

Abstract

Carbon -di-oxide (CO2) is regarded as the most important greenhouse gas to accelerate climate change and ocean acidification. The Chinese government is seeking methods to reduce anthropogenic CO2 gas emission. CO2 capture and geological storage is one of the main methods. In addition, injecting CO2 is also an effective method to replenish formation energy in developing tight oil reservoirs. However, exiting methods to estimate CO2 storage capacity are all based on the material balance theory. This was absolutely correct for normal reservoirs. However, as natural fractures widely exist in tight oil reservoirs and majority of them are vertical ones, tight oil reservoirs are not close. Therefore, material balance theory is not adaptive. In the present study, a new method to calculate CO2 storage capacity is presented. The CO2 effective storage capacity, in this new method, consisted of free CO2, CO2 dissolved in oil and CO2 dissolved in water. Case studies of tight oil reservoir from Ordos Basin was conducted and it was found that due to far lower viscosity of CO2 and larger solubility in oil, CO2 could flow in tight oil reservoirs more easily. As a result, injecting CO2 in tight oil reservoirs could obviously enhance sweep efficiency by 24.5% and oil recovery efficiency by 7.5%. CO2 effective storage capacity of Chang 7 tight oil reservoir in Longdong area was 1.88?107 t. The Chang 7 tight oil reservoir in Ordos Basin was estimated to be 6.38?1011 t. As tight oil reservoirs were widely distributed in Songliao Basin, Sichuan Basin and so on, geological storage capacity of CO2 in China is potential. ??  

 

 

 Key words

CO2 Effective storage capacity, Enhance oil recovery, Tight oil reservoirs

 

 

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