Zheyu Liu
Associate Professor
China University of Petroleum Beijing
Zheyu Liu is an associate professor in College of Petroleum Engineering at China University of Petroleum Beijing. He got the Ph. D degree from China University of Petroleum Beijing at 2019. He authorized or co-authorized more than 40 peer-reviewed papers and granted 18 Chinese patents. His primary field of research involves interfacial science and transport processes in porous media related to energy production from hydrocarbon resources, especially for enhanced oil recovery. He is particularly interested in fluid-fluid and fluid-rock interactions and their impact on phase behavior and transport. Multi experimental methods include NMR, core flooding, microfluidic apparatus are adopted in his study. Now his ongoing or completed projects related to enhanced oil recovery include:
- Chemical EOR, especially for Emulsification in CEOR
- Profile Control in High Water Cut Heterogeneous Reservoir\
- Nanofluids Utilization in Oil Recovery
- CO2 EOR and Sequestration
- Imbibition Recovery in Tight Oil and Shale Oil
Participates in
TECHNICAL PROGRAMME | Energy Infrastructure
CCS Hub Facilities
Forum 09 | Technical Programme Hall 2
28
April
14:30
16:00
UTC+3
CO2 injection into reservoirs for enhanced oil recovery and sequestration is the most efficiency way to realize the carbon neutrality goal. Various types of reservoirs could be the targets for CO2 sequestration but which one should be the best choice is still unclear, especially for the huge reserves of heavy oil reservoirs and low permeability reservoirs. The sealing property of cap rock, displacement efficiency of CO2 flooding and CO2 dissolution ability in the oil jointly determined the CO2 sequestration potential.
This work compared the CO2 sequestration potential between heavy oil reservoirs and low permeability light oil reservoirs via a series of experiments and numerical simulations. The breakthrough pressure of CO2 in the caprock, the CO2 dissolution amount in heavy oil and light oil and oil displacement effective by CO2 flooding were investigated to evaluate CO2 sequestration capability via dissolution and capillary trapping in two types reservoirs. Moreover, the numerical simulation of CO2 flooding in a heavy oil reservoir and low permeability reservoir were performed based on the above experimental data to quantitatively clarify the CO2 sequestration potential.
The breakthrough pressure of the mudstone caprock of the heavy oil reservoir was 35 times higher than that of the silty mudstone caprock of the low permeability reservoir, which indicated the CO2 sequestration pressure in the low permeability reservoir was higher than that in the heavy oi reservoir. The solubility of CO2 in the heavy oil was 2 times lower than that in the light oil. The CO2 sequestration amount per unit pore volume was slightly higher in the heavy oil reservoir than that in the light oil reservoir under a certain temperature and pressure condition, and it increased while temperature increased due to the incremental displacement efficiency of heavy oil. The proportion of CO2 sequestration by capillary trapping in low permeability cores could reach 87% while the CO2 sequestration by dissolution in the heavy oil reservoir was nearly 30%. Numerical simulation found that in the real reservoir conduction, the CO2 sequestration amount per unit pore volume of low permeability light oil reservoir was 1.5 times than that of the heavy oil reservoir because the low permeability reservoir possessed a larger reservoir pressure and higher CO2 displacement efficiency.
Our work found compare to the heavy oil reservoir, the low permeability light oil reservoir presented a larger CO2 sequestration potential. The CO2 flooding could significantly enhance the heavy oil recovery, especially in coordination with the temperature increment. We expect this work could point out the application direction for the CO2 enhanced oil recovery and sequestration.
Co-author/s:
Yiqiang Li, Professor, China University of Petroleum
This work compared the CO2 sequestration potential between heavy oil reservoirs and low permeability light oil reservoirs via a series of experiments and numerical simulations. The breakthrough pressure of CO2 in the caprock, the CO2 dissolution amount in heavy oil and light oil and oil displacement effective by CO2 flooding were investigated to evaluate CO2 sequestration capability via dissolution and capillary trapping in two types reservoirs. Moreover, the numerical simulation of CO2 flooding in a heavy oil reservoir and low permeability reservoir were performed based on the above experimental data to quantitatively clarify the CO2 sequestration potential.
The breakthrough pressure of the mudstone caprock of the heavy oil reservoir was 35 times higher than that of the silty mudstone caprock of the low permeability reservoir, which indicated the CO2 sequestration pressure in the low permeability reservoir was higher than that in the heavy oi reservoir. The solubility of CO2 in the heavy oil was 2 times lower than that in the light oil. The CO2 sequestration amount per unit pore volume was slightly higher in the heavy oil reservoir than that in the light oil reservoir under a certain temperature and pressure condition, and it increased while temperature increased due to the incremental displacement efficiency of heavy oil. The proportion of CO2 sequestration by capillary trapping in low permeability cores could reach 87% while the CO2 sequestration by dissolution in the heavy oil reservoir was nearly 30%. Numerical simulation found that in the real reservoir conduction, the CO2 sequestration amount per unit pore volume of low permeability light oil reservoir was 1.5 times than that of the heavy oil reservoir because the low permeability reservoir possessed a larger reservoir pressure and higher CO2 displacement efficiency.
Our work found compare to the heavy oil reservoir, the low permeability light oil reservoir presented a larger CO2 sequestration potential. The CO2 flooding could significantly enhance the heavy oil recovery, especially in coordination with the temperature increment. We expect this work could point out the application direction for the CO2 enhanced oil recovery and sequestration.
Co-author/s:
Yiqiang Li, Professor, China University of Petroleum
TECHNICAL PROGRAMME | Primary Energy Supply
New Exploration & Production Technologies to Extend Supply
Forum 03 | Digital Poster Plaza 1
29
April
11:30
13:30
UTC+3
Heavy oil accounts for more than 70% of crude oil resources worldwide. Considered as heavy oil main development technology, steam injection has problems such as difficulty in improving underground steam temperature, dryness and high energy consumption with large carbon emission of steam preparation on the ground. How to improve heat utilization efficiency is critical issue for heavy oil thermal recovery under the background of carbon neutrality
Herein, we propose using a reactor equipped with catalyst in the wellbore to produce a chemical reaction under the continuous supply of reactants and steam, which can generate hydrocarbon and release heat step by step towards high steam quality injection. The generation, regulation, transport, and utilization of heat-hydrocarbon sources are used as the main line. The mechanism of heat-hydrocarbon assistant steam to improve heavy oil recovery are investigated to know the demand of heat energy in different reservoir development stages. Based on this, a safe, stable and long-term multi-chemical reaction system in the complex downhole environment is constructed.
So far, the catalyst which could generate hydrocarbon and release heat under the complex underground conditions were synthesized and the effect of multi-factor such as temperature, pressure and airspeed on the conversion degree of reactant were investigated. It was found that the chemical reaction allowed the temperature of reactor to increase from 250℃ to 427℃ without steam injection and changed from 250℃ to 327℃ when steams flow through the reactor. Moreover, the product of the reaction could decrease the viscosity of heavy oil nearly 50% even at the relatively low temperature. Compare to the steam flooding, chemical reaction assist steam could further increase oil recovery factor more than 13% and significantly improve the quality of steam.
This method can solve the problem of steam injection for heavy oil production in the deeply-buried reservoir, which will provide basic theory and method guidance for the breakthrough of disruptive technology of large-scale green, low-carbon and efficient development of heavy oil.
Co-author/s:
Yiqiang Li, Professor, China University of Petroleum.
Herein, we propose using a reactor equipped with catalyst in the wellbore to produce a chemical reaction under the continuous supply of reactants and steam, which can generate hydrocarbon and release heat step by step towards high steam quality injection. The generation, regulation, transport, and utilization of heat-hydrocarbon sources are used as the main line. The mechanism of heat-hydrocarbon assistant steam to improve heavy oil recovery are investigated to know the demand of heat energy in different reservoir development stages. Based on this, a safe, stable and long-term multi-chemical reaction system in the complex downhole environment is constructed.
So far, the catalyst which could generate hydrocarbon and release heat under the complex underground conditions were synthesized and the effect of multi-factor such as temperature, pressure and airspeed on the conversion degree of reactant were investigated. It was found that the chemical reaction allowed the temperature of reactor to increase from 250℃ to 427℃ without steam injection and changed from 250℃ to 327℃ when steams flow through the reactor. Moreover, the product of the reaction could decrease the viscosity of heavy oil nearly 50% even at the relatively low temperature. Compare to the steam flooding, chemical reaction assist steam could further increase oil recovery factor more than 13% and significantly improve the quality of steam.
This method can solve the problem of steam injection for heavy oil production in the deeply-buried reservoir, which will provide basic theory and method guidance for the breakthrough of disruptive technology of large-scale green, low-carbon and efficient development of heavy oil.
Co-author/s:
Yiqiang Li, Professor, China University of Petroleum.
