Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (2): 149-160.doi: 10.12108/yxyqc.20200217

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Mechanism of nitrogen flooding in Yong 66 block of Yong'an Oilfield,Bohai Bay Basin

GUAN Hua1, GUO Ping1, ZHAO Chunlan1, TAN Baoguo2, XU Dongmei2   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;
    2. Research Institute of Exploration and Development, SINOPEC Shengli Oilfield Company, Dongying 257015, Shandong, China
  • Received:2019-06-23 Revised:2019-09-17 Online:2020-03-21 Published:2020-01-19

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Abstract: In order to study the mechanism of nitrogen flooding and its variation law in Yong 66 block of Yong'an Oilfield in Bohai Bay Basin,fluid phase experiments and numerical simulations were carried out on the basis of geological study. The results show that:(1)During the nitrogen injection process,the formation dip angle,displacement velocity and capillary pressure have obvious effects on the change of oil saturation and interfacial tension. (2)The greater the formation dip angle and displacement velocity are,more crude oil is displaced to the bottom of the reservoir,the greater the oil saturation at the bottom of the reservoir is. At the same time,the upper fluid of the reservoir becomes the two phases of oil and gas,and the interfacial tension increases.(3)During the process of nitrogen flooding,as the capillary pressure increases,the resistance of the gas entering into the pores increases, and so does the oil saturation at the bottom,although the accumulation of crude oil to the bottom of the reservoir slows down. Also,the tension at the top interface increases,while the range and degree of the change gradually decreases. The research results have a guiding role in the application of nitrogen flooding to enhance oil recovery in the development of oil and gas fields.

Key words: fluid phase experiment, phase behavior matching, numerical simulation, nitrogen flooding, Yong'an Oilfield, Bohai Bay Basin

CLC Number: 

  • TE357.7
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