Influence of Overburden Pressure on Imbibition Behavior in Tight Sandstones Using Nuclear Magnetic Resonance Technique

Author:

Meng Mianmo12,Li Longlong3,Yuan Bao4,Wang Qianyou5,Sun Xiaohui6,Zhang Ye78,Li Dahua78

Affiliation:

1. China University of Geosciences Hubei Key Laboratory of Marine Geological Resources, , Wuhan 430074 , China;

2. China University of Geosciences College of Marine Science and Technology, , Wuhan 430074 , China

3. Taiyuan University of Technology School of Safety and Emergency Management Engineering, , Taiyuan 030024 , China

4. Spallation Neutron Source Science Center , Dongguan 523803 , China

5. University of Liverpool Department of Earth, Ocean and Ecological Sciences, , Liverpool L69 3GP , UK

6. Shandong Institute of Coal Geology Planning and Exploration , Jinan 250104 , China

7. Chongqing Institute of Geology & Mineral Resources National Joint Engineering Research Center for Shale Gas Exploration and Development, , Chongqing 401120 , China;

8. Ministry of Natural Resources (Chongqing Institute of Geology & Mineral Resources) Key Laboratory of Shale Gas Exploration, , Chongqing 401120 , China

Abstract

Abstract Imbibition under overburden pressure can simulate the imbibition behavior in reservoir conditions during hydraulic fracturing, about which the mechanism is still unclear. This study investigated the imbibition with overburden pressure using a nuclear magnetic resonance (NMR) displacement design. The main contribution of this study is that the initial imbibition rate under confining pressure can reflect the pore connectivity of reservoirs under overburden pressure and a method for appraising the pore connectivity under confining pressure was established. The tight sandstone samples were collected from the Upper Paleozoic Taiyuan and Shihezi Formations in Ordos Basin. The Taiyuan Formation presents the apparent double-peak structure from NMR spectra, and liquid fills into small pore preferentially as a whole. When the imbibition time is on a square root scale, the cumulative imbibition height at the initial imbibition period is not stable, which deviates from the linear principle, and the initial imbibition rate ranges from 0.077 to 0.1145. The Shihezi Formation shows a dominant peak structure from NMR spectra, and the liquid has no obvious filling order as a whole. When the imbibition time is on a square root scale, the cumulative imbibition height at the initial imbibition period also deviates from the linear principle, and the initial imbibition rate ranges from 0.0641 to 0.1619.

Funder

China University of Geosciences, Wuhan

National Natural Science Foundation of China

Publisher

ASME International

Subject

Geochemistry and Petrology,Mechanical Engineering,Energy Engineering and Power Technology,Fuel Technology,Renewable Energy, Sustainability and the Environment

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