Special Oil & Gas Reservoirs >

2021 , Vol. 28 >Issue 4: 96 - 101

DOI: https://doi.org/10.3969/j.issn.1006-6535.2021.04.013

Reservoir Engineering

Study on the Characteristics of Changes in Heavy Oil Components during In-Situ Combustion

  • Jiang Haiyan ,
  • Li Tianyue ,
  • Du Kun ,
  • Yuan Shibao ,
  • Zhang Yupeng
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  • 1. Xi'an Shiyou University, Xi'an, Shaanxi 710065, China;
    2. Shaanxi Key Laboratory of Advanced Stimulation Technology for Oil and Gas Reservoirs, Xi'an, Shaanxi 710065, China;
    3. PetroChina Changqing Oilfield Company, Qingcheng, Gansu 745100, China;
    4. PetroChina Tarim Oilfield Company, Korla, Xinjiang 841000, China

Received date: 2020-07-23

  Revised date: 2021-05-27

  Online published: 2022-02-18

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Abstract

In view of the complicated changes in heavy oil components during in-situ combustion, the characteristics of changes in heavy oil components between different zones in the in-situ combustion were studied based on CMG-WinProp module. The results of the study showed that the heavy components were cracked into light components by high-temperature oxidation reaction in the combustion zone; the light components were polymerized and converted into heavy components in the coking zone; the light oil after combustion reaction was mainly accumulated in the oil bank zone. The change of the phase diagram showed that with the progress of in-situ combustion, the reservoir temperature was gradually increased, the gas-liquid area was gradually widened, and the critical point of phase diagram moved to the upper left with the increase of light component content. The study results are of great significance for further understanding the laws of component changes in the thermal recovery of heavy oil.

Key words： in-situ combustion; thermal recovery of heavy oil; component migration; phase change

Cite this article

Jiang Haiyan , Li Tianyue , Du Kun , Yuan Shibao , Zhang Yupeng . Study on the Characteristics of Changes in Heavy Oil Components during In-Situ Combustion[J]. Special Oil & Gas Reservoirs, 2021 , 28(4) : 96 -101 . DOI: 10.3969/j.issn.1006-6535.2021.04.013

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