Special Oil & Gas Reservoirs >

2023 , Vol. 30 >Issue 3: 106 - 114

DOI: https://doi.org/10.3969/j.issn.1006-6535.2023.03.013

Reservoir Engineering

Study on CO2 Huff-N-Puff Enhanced Recovery Technology for Jimsar Shale Oil

  • Cao Changxiao ,
  • Song Zhaojie ,
  • Shi Yaoli ,
  • Gao Yang ,
  • Guo Jia ,
  • Chang Xuya
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  • 1. Unconventional Petroleum Research Institute, China University of Petroleum (Beijing), Beijing 102249, China;
    2. PetroChina Xinjiang Oilfield Company, Karamay, Xinjiang 834000, China

Received date: 2022-08-15

  Revised date: 2023-03-20

  Online published: 2023-07-13

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Abstract

To address the problems of low recovery rate and poor water injection huff-n-puff effect in the depleted development of Jimsar shale oil. A study on the applicability of CO2 huff-n-puff technology in shale oil reservoirs was carried out by means of hydrocarbon phase experiments and numerical simulation methods for reservoirs to guide the implementation of CO2 huff-n-puff technology in the field. The results show that Compared with CH4, CO2 interacts better with Jimsar shale oil. Under the conditions of formation pressure and formation temperature, the solution gas-oil ratio of CO2 in crude oil is 497.83 m3/m3, the crude oil viscosity is reduced by 70.65%, and the crude oil volume is expanded by 2.05 times; for typical shale oil wells, multi-cycle CO2 huff-n-puff can improve the recovery rate by 9.43 percentage points and crude oil production by 31 472.40 t. With the shortening of fracture spacing and the increase of reservoir porosity, the effect of CO2 huff-n-puff on oil enhancement gradually becomes better, and the influence of permeability and oil saturation on the effect of CO2 huff-n-puff is relatively small. The results of the field test show that CO2 huff-n-puff can effectively enhance the recovery rate of shale oil, and the oil enhancement effect is better under the condition of no fracture disturbance. The research results have some implications for the efficient development of shale oil.

Key words： shale oil; CO2 huff-n-puff; enhanced recovery; PVT experiment; numerical simulation; Jimsar

Cite this article

Cao Changxiao , Song Zhaojie , Shi Yaoli , Gao Yang , Guo Jia , Chang Xuya . Study on CO2 Huff-N-Puff Enhanced Recovery Technology for Jimsar Shale Oil[J]. Special Oil & Gas Reservoirs, 2023 , 30(3) : 106 -114 . DOI: 10.3969/j.issn.1006-6535.2023.03.013

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