Abstract
Low-permeability gas reservoirs, which are widely distributed in China offshore, have maintained a rapid increase on exploration reserve during the past years. The low-permeability gas reservoirs in China offshore gas field have low porosity and low permeability which range between 0.3 and 1 mD. Developing practice shows that these reservoirs could hardly be developed. Due to the characteristics: poor physical property, low reserves abundance, low recovery, etc., the research of porous flow mechanism is important to the gas field’s development.
This study researched the following: microscopic mechanism of the water-gas flow in low-permeability sandstone through the core experiment, measurement method for water saturation with nuclear magnetic resonance (NMR) technology, calculation method for mobile water saturation measurement, effect of the crustal stress on permeability of the core in accordance with the reservoir under high pressure, etc.
This paper presented several methods and viewpoints: the mobile water saturation is around a fixed high value in the research area; due to the high value, most of the gas production wells would produce water with gas in the early time; the crustal stress has a low sensitivity in the research area; the gas permeability and water permeability under the high-pressure environment are lower than in the traditional condition.
By summarizing the viewpoints, the overall analysis method based on permeability, porosity, gas saturation, mobile water saturation, etc. could be proposed. It could provide quantitative basis for productivity calculation and guidance for the gas field’s development.
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Acknowledgments
The authors would like to acknowledge the colleagues for their hard work and contribution in this research. This paper is based on many reports and researches of many colleagues in the research institute. All the authors wish to acknowledge the leaders of CNOOC Ltd., Shanghai, for the support and permission to publish this paper.
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Li, Y., Cai, H., Yang, Z. (2018). Study of Porous Flow Mechanism for Low-Permeability Sandstone by the Use of NMR. In: Aloui, F., Dincer, I. (eds) Exergy for A Better Environment and Improved Sustainability 1. Green Energy and Technology. Springer, Cham. https://doi.org/10.1007/978-3-319-62572-0_4
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