CO2 assisted steam flooding in late steam flooding in heavy oil reservoirs

Chen, Xi; Qi, Zongyao; Zhang, Yunjun; Liu, Tong; Shen, Dehuang; Mu, Hetaer; Dong, Hong; Li, Xiuluan; Jiang, Youwei; Wang, Hongzhuang

doi:10.1016/s1876-3804(19)60277-6

Cited by 29 publications

(5 citation statements)

References 23 publications

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“…This phenomenon did not occur in the steam-only-treated wells. Both the lab and field tests showed that this type of emulsified foam oil could significantly reduce the viscosity of heavy oil [16,17]. Further research is required to reveal what mechanisms lead to the formation of this type of emulsified foam oil, which is created when steam and CO 2 are coinjected to recover heavy oil.…”

Section: Classification Of Production Wells In the Test Areamentioning

confidence: 99%

Status Quo of a CO2-Assisted Steam-Flooding Pilot Test in China

Liu

Chen

et al. 2021

Geofluids

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It is challenging to enhance heavy oil recovery in the late stages of steam flooding. This challenge is due to reduced residual oil saturation, high steam-oil ratio, and lower profitability. A field test of the CO2-assisted steam flooding technique was carried out in the steam-flooded heavy oil reservoir in the J6 block of the Xinjiang oil field (China). In the field test, a positive response to the CO2-assisted steam flooding treatment was observed, including a gradually increasing heavy oil production, an increase in the formation pressure, and a decrease in the water cut. The production wells in the test area mainly exhibited four types of production dynamics, and some of the production wells exhibited production dynamics that were completely different from those during steam flooding. After being flooded via CO2-assisted steam flooding, these wells exhibited a gravity drainage pattern without steam channeling issues, and hence, they yielded stable oil production. In addition, emulsified oil and CO2 foam were produced from the production well, which agreed well with the results of laboratory-scale tests. The reservoir-simulation-based prediction for the test reservoir shows that the CO2-assisted steam flooding technique can reduce the steam-oil ratio from 12 m3 (CWE)/t to 6 m3 (CWE)/t and can yield a final recovery factor of 70%.

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Section: Classification Of Production Wells In the Test Areamentioning

confidence: 99%

Status Quo of a CO2-Assisted Steam-Flooding Pilot Test in China

Liu

Chen

et al. 2021

Geofluids

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“…This reduction in heat results in a decreased radial influence of the steam, thus reducing the effective sweep area of the reservoir and impacting oil recovery rates. The current solutions generally involve the use of injected gases, solvents, urea, and other common media (Wang et al, 2013;Haddad and Gates, 2017;Zhang et al, 2017;Xi et al, 2019;Li et al, 2020;Cui et al, 2020;Wang et al, 2023a;Wang et al, 2023b;Chu and Zhang, 2023;Prasad et al, 2023). Al-Murayri (Al-Murayri et al, 2016) employed the Expanding Solvent Steam Assisted Gravity Drainage (ES-SAGD) method, which utilizes a combination of heat transfer and mass transfer processes to enhance the flow of high-viscosity oil.…”

Section: Introductionmentioning

confidence: 99%

Study on optimization and mechanism of CO2 injection to enhance oil recovery in mid-deep heavy oil reservoirs

Zhang,

Qi,

Wang

et al. 2024

Front. Energy Res.

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In order to improve the oil recovery of mid-deep heavy oil reservoirs, this study investigates the efficiency of enhanced oil recovery and the mechanisms of oil displacement in mid-deep heavy oil reservoirs using different injected gases (N2, CH4, CO2) and development approaches (gas flooding and gas huff-n-puff) through a series of experiments. These experiments include high-pressure physical properties tests of crude oil after gas injection, displacement efficiency tests of gas injection, and displacement efficiency tests of gas huff-n-puff. The results indicate that for mid-deep heavy oil reservoirs, the preferred optimal injection gas is CO2, with gas huff-n-puff being the most effective development method. Furthermore, a numerical simulation study was conducted to explore the adaptability parameters of CO2 huff-n-puff development in different well patterns, encompassing variables such as the amount of gas injected per cycle, crude oil viscosity, reservoir permeability, and oil layer thickness.

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“…The viscosity reduction effect of chemical flooding agents varies greatly in different oil regions [ 5 ]. Thermal flooding has the widest range of applications, but the oil viscosity remains higher after oil production [ 6 , 7 ]. Steam-assisted gravity flooding is limited by the various factors of layers of soil; therefore, the technique is still at the theoretical stage [ 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Sodium Bentonite in the Thermo-Catalytic Reduction of Viscosity of Heavy Oils

Zhou

Zhang

et al. 2023

Molecules

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To study the synergistic catalysis of an ex situ catalyst and in situ clay in the aquathermolysis of heavy oil, in this paper, a series of bentonite-supported catechol-metal complexes were prepared, and the catalytic viscosity reduction performance in the aquathermolysis of heavy oil was investigated. Under the optimized conditions, the viscosity can be reduced by 73%, and the pour point can be lowered by 15.0 °C at most, showing the synergistic catalysis of the ex situ catalyst and in situ clay in this aquathermolytic reaction. Thermogravimetry, physical adsorption-desorption, and scanning electron microscopy were conducted to characterize the thermal stability and microstructure of the ex situ catalyst. The components of the heavy oil before and after the reaction were fully characterized. Six model compounds were used to simulate the aquathermolysis reaction process. In order to study the mechanism of viscosity reduction after the catalytic aquathermolysis reaction, the compounds were analyzed by GC-MS. It is believed that these results will be beneficial in the future for related research in this field.

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CO2 assisted steam flooding in late steam flooding in heavy oil reservoirs

Cited by 29 publications

References 23 publications

Status Quo of a CO2-Assisted Steam-Flooding Pilot Test in China

Status Quo of a CO2-Assisted Steam-Flooding Pilot Test in China

Study on optimization and mechanism of CO2 injection to enhance oil recovery in mid-deep heavy oil reservoirs

The Effect of Sodium Bentonite in the Thermo-Catalytic Reduction of Viscosity of Heavy Oils

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