Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (3): 140-146.doi: 10.3969/j.issn.1673-8926.2017.03.017

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Suitability evaluation of enhanced oil recovery by CO2 flooding

YANG Hong1, WANG Hong1, NAN Yufeng2, QU Yaning3, LIANG Kaiqiang1, JIANG Shaojing1   

  1. 1. Research Institute of Shaanxi Yanchang Petroleum(Group) Co., Ltd., Xi'an 710075, China;
    2. PetroChina Oil and Gas Control Center in Beijing, Beijing 100007, China;
    3. Dingbian Oil Production Plant, Yanchang Oilfield Co., Ltd., Yulin 719000, Shaanxi, China
  • Received:2016-12-06 Revised:2017-02-15 Online:2017-05-21 Published:2017-05-21

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Abstract: In order to solve the problems that the influencing factor selection and suitability evaluation of enhanced oil recovery (EOR)by CO2 flooding are limited to qualitative or semi quantitative analysis, grey correlation analysis method was introduced to calculate the association degree and weight coefficient of the EOR influencing factors by CO2 flooding in seven CO2 flooding reservoirs, and the EOR influencing factors by CO2 flooding were quantitatively analyzed. Meantime, the suitability of CO2 flooding in reservoir was evaluated, and this method were used to evaluate CO2 flooding potential in Dingbian-Wuqi oilfield. The results show the order of EOR influence factors from strong to weak:ratio of MMP to original reservoir pressure, formation effective thickness, buried depth, crude oil viscosity underground,ground crude oil density, remaining oil saturation, reservoir temperature, porosity and permeability. The CO2 flooding is mainly for type Ⅰ and Ⅱ reservoirs in Dingbian-Wuqi oilfield, which means that it is suitable for CO2 flooding in the oilfield.

Key words: reservoir classification, flow zone indicator, pore throat radius, East African Rift, Albert Basin

CLC Number: 

  • TE34
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