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Research Papers: Oil/Gas Reservoirs

Investigation of CO2–CH4 Displacement and Transport in Shale for Enhanced Shale Gas Recovery and CO2 Sequestration

[+] Author and Article Information
Xi-Dong Du

State Key Laboratory of Coal Mine Disaster
Dynamics and Control,
College of Resources and
Environmental Science,
Chongqing University,
No. 174 Sha Zheng Street,
Chongqing 400044, China
e-mail: xidongdu@126.com

Min Gu

State Key Laboratory of Coal Mine
Disaster Dynamics and Control,
College of Resources and
Environmental Science,
Chongqing University,
No. 174 Sha Zheng Street,
Chongqing 400044, China
e-mail: mgu@cqu.edu.cn

Shuo Duan

State Key Laboratory of Coal Mine Disaster
Dynamics and Control,
College of Resources and
Environmental Science,
Chongqing University,
No. 174 Sha Zheng Street,
Chongqing 400044, China
e-mail: 278444324@qq.com

Xue-Fu Xian

State Key Laboratory of Coal Mine
Disaster Dynamics and Control,
College of Resources and
Environmental Science,
Chongqing University,
No. 174 Sha Zheng Street,
Chongqing 400044, China
e-mail: xianxf@cae.cn

1Corresponding author.

Contributed by the Petroleum Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received July 18, 2016; final manuscript received October 26, 2016; published online November 29, 2016. Assoc. Editor: Mohamed A. Habib.

J. Energy Resour. Technol 139(1), 012909 (Nov 29, 2016) (9 pages) Paper No: JERT-16-1299; doi: 10.1115/1.4035148 History: Received July 18, 2016; Revised October 26, 2016

To gain a better understanding of the enhanced shale gas recovery by CO2 gas injection (CO2-ESGR) technique, the dynamic displacement mechanism of CO2–CH4, the CO2 enhanced shale gas recovery (RCH4), and CO2 storage capacity (VCO2) were studied based on transport properties of CO2 and CH4. Experiments of CO2 injection into shale gas reservoir preadsorbed by CH4 were performed in a fixed bed. Breakthrough curves were obtained under different test conditions and simulated by one-dimension advection-dispersion (AD) model. It was found that dispersion coefficient (K1) rather than molecular diffusivity of CO2 dominated its transport in shale. K1 together with advection velocity (υ) of CO2 during CH4 displacement controls RCH4 and VCO2. When transporting in shale gas reservoir, CO2 had larger dynamic adsorption amount and υ, but smaller K1 than CH4. The competitive transport and adsorption behavior of CO2 and CH4 made it possible for CO2 to store in shale reservoir and to drive the in-place CH4 out of shale reservoir. The transfer zone of CO2–CH4 displacement (CCD) was very wide. High RCH4 and VCO2 were reached at low injection CO2 gas pressure and for small shale particles. Higher injection flow rates of CO2 and temperatures ranging from 298 K to 338 K had a little effect on RCH4 and VCO2. For field conditions, high CO2 injection pressure has to be used because the pore pressure of shale reservoir and adsorption amount of CH4 increase with the increase in depth of shale gas reservoir, but RCH4 is still not high.

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Figures

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Fig. 3

Reproducibility of CO2–CH4 displacement experiments

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Fig. 2

Schematic diagram of the experiment apparatus

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Fig. 4

Experimental and simulated breakthrough curves at different pressures of (a) 1 MPa and (b) 3 MPa

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Fig. 5

The pressure change of adsorption column at different injection pressures of (a) 1 MPa and (b) 3 MPa

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Fig. 1

The pore size distribution of Cn shale for small pores (a) and macropores/fractures (b)

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Fig. 6

The distribution of CO2 concentration in gas phase inside the adsorption column at different time for process of (a) CO2–CH4 displacement (test no. 3) and (b) pure CO2 (test no. 2)

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Fig. 7

Effect of particle size (dp) on breakthrough curves of CO2 at different injection pressures of (a) 1 MPa and (b) 3 MPa. Experimental data (symbols) and simulated results (lines).

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Fig. 9

Effect of temperature on CO2 breakthrough curves. Experimental data (symbols) and simulated results (lines).

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Fig. 8

Effect of injection flow rate of CO2 (FCO2) on breakthrough curves of CO2. Experimental data (symbols) and simulated results (lines).

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