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Research Papers: Petroleum Engineering

Nuclear Magnetic Resonance Simulation Experiment for a Water Drive Gas Reservoir

[+] Author and Article Information
Qianhua Xiao

School of Oil and Gas Engineering,
Chongqing University of Science and Technology,
Chongqing 404100, China
e-mail: xiaoqianhua10@mails.ucas.edu.cn

Feifei Fang

School of Oil and Gas Engineering,
Chongqing University of Science and Technology,
Chongqing 404100, China
e-mail: fangfeifei13@mails.ucas.ac.cn

Zhiyuan Wang

Institute of Oceanography, Minjiang University,
Fuzhou 350121, Fujian, China;
Institute of Porous Flow and Fluid Mechanics,
University of Chinese Academy of Sciences,
Langfang, Hebei 065007, China
e-mail: wangzhiyuan14@mails.ucas.edu.cn

Bocai Jiang

School of Oil and Gas Engineering,
Chongqing University of Science and Technology,
Chongqing 404100, China
e-mail: 305770257@qq.com

Yingzhong Yuan

School of Oil and Gas Engineering,
Chongqing University of Science and Technology,
Chongqing 404100, China
e-mail: yuanyingzh0001@126.com

1Corresponding author.

Contributed by the Petroleum Division of ASME for publication in the Journal of Energy Resources Technology. Manuscript received October 17, 2018; final manuscript received April 21, 2019; published online May 14, 2019. Assoc. Editor: Fanhua Zeng.

J. Energy Resour. Technol 141(11), 112901 (May 14, 2019) (5 pages) Paper No: JERT-18-1789; doi: 10.1115/1.4043636 History: Received October 17, 2018; Accepted April 24, 2019

The water invasion property and water drive gas displacement efficiency of water drive gas reservoirs are studied under different displacement pressure gradients by using nuclear magnetic resonance (NMR) online detection technology to better guide the scientific exploration of these reservoirs. The breakthrough pressures of the water seal and water lock are also analyzed. The results show that low-permeability gas reservoir water bodies pass through large pores preferentially and then pass through holes and small pores. The remaining gas is mainly distributed in holes and small pores. In contrast, high-permeability gas reservoir water bodies pass through large pores and holes preferentially, and the remaining gas is mainly distributed in large pores and small pores. As the permeability increases, the water drive gas displacement efficiency decreases. As the displacement pressure gradient increases, the displacement efficiency initially increases and then decreases. The breakthrough pressures of the water seal and water lock are highly affected by the permeability. Large permeability results in easy water breakthrough. Variations in the water invasion and water drive gas displacement efficiency are consistent with the variations of the breakthrough pressure and accurately reflect the properties of water drive gas reservoirs.

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Figures

Grahic Jump Location
Fig. 1

Experimental scheme of the online NMR detection system

Grahic Jump Location
Fig. 2

Results of water drive gas NMR detection

Grahic Jump Location
Fig. 3

Correlation between the displacement degree and differential pressure in the samples with low permeability

Grahic Jump Location
Fig. 4

Correlation between the displacement degree and differential pressure in the samples with high permeability

Grahic Jump Location
Fig. 5

Correlation between the displacement efficiency and pressure gradient in the samples with different permeability values (the dotted line represents the connection of the experimental data, and the solid line represents the trend of the corresponding color experimental data)

Grahic Jump Location
Fig. 6

Variations in the breakthrough pressure of the samples with different permeability values

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