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Study on the Mechanism of Ionic Stabilizers on Shale Gas Reservoir Mechanics in Northwestern Hunan

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  • Pinghe Sun

    (Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Changsha 410083, China
    School of Geosciences and Info–physics, Central South University, Changsha 410083, China)

  • Junyi Zhu

    (Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Changsha 410083, China
    School of Geosciences and Info–physics, Central South University, Changsha 410083, China)

  • Binkui Zhao

    (Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Changsha 410083, China
    School of Geosciences and Info–physics, Central South University, Changsha 410083, China)

  • Xinxin Zhang

    (Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Changsha 410083, China
    School of Geosciences and Info–physics, Central South University, Changsha 410083, China)

  • Han Cao

    (Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Changsha 410083, China
    School of Geosciences and Info–physics, Central South University, Changsha 410083, China)

  • Mingjin Tian

    (Hunan Provincial Communications Planning, Survey and Design Institute Co., Ltd., Hunan Changsha 410008, China)

  • Meng Han

    (Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Changsha 410083, China
    School of Geosciences and Info–physics, Central South University, Changsha 410083, China)

  • Weisheng Liu

    (Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Changsha 410083, China
    School of Geosciences and Info–physics, Central South University, Changsha 410083, China)

Abstract

The shale of the lower Cambrian Niutitang formation in northwestern Hunan is an ideal reservoir for shale gas. There is a close connection between borehole stability and drilling fluid in shale gas drilling. Ionic stabilizer is a new type of stratum consolidation agent that inhibits the hydration expansion of clay minerals and improves mechanical strength of the borehole. The traditional idea of pore wall protection is to use drilling fluid additives to prevent shale from interacting with water. However, ionic stabilizer can change the hydrophilic of clay minerals in shale, making the particles become hydrophobic and dense, therefore, the formation stability can be enhanced simultaneously. The material used in this paper is different from the normal ionic stabilizer, some chemical bonds that have been changed in the new material called enhanced normality ionic (ENI) stabilizer. This paper utilized the shale samples those obtained from Niutitang formation to study the connection between ENI and the mechanical properties of shale. Mechanical tests and microscopic pore tests were performed on different samples which were soaked in water and the ENI with different concentrations. It has been found through tests that ENI can inhibit the development of shale pores, and as the concentration increases, the inhibition increases. In addition, as the ENI concentration increases, the uniaxial compressive strength and Young’s modulus of the shale increase, and the ratio of stability coefficients decreases. It can be concluded that the ENI can improve the mechanical strength of carbon shale, and prevent the development of rock damage. Moreover, it can improve the ability of rock to resist damage, and enhance borehole stability initiatively.

Suggested Citation

  • Pinghe Sun & Junyi Zhu & Binkui Zhao & Xinxin Zhang & Han Cao & Mingjin Tian & Meng Han & Weisheng Liu, 2019. "Study on the Mechanism of Ionic Stabilizers on Shale Gas Reservoir Mechanics in Northwestern Hunan," Energies, MDPI, vol. 12(12), pages 1-11, June.
  • Handle: RePEc:gam:jeners:v:12:y:2019:i:12:p:2453-:d:242918
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    References listed on IDEAS

    as
    1. Zisis Vryzas & Vassilios C. Kelessidis, 2017. "Nano-Based Drilling Fluids: A Review," Energies, MDPI, vol. 10(4), pages 1-34, April.
    2. Han Cao & Tianyi Wang & Ting Bao & Pinghe Sun & Zheng Zhang & Jingjing Wu, 2018. "Effective Exploitation Potential of Shale Gas from Lower Cambrian Niutitang Formation, Northwestern Hunan, China," Energies, MDPI, vol. 11(12), pages 1-18, December.
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    Cited by:

    1. Zhang Qiang & Qamar Yasin & Naser Golsanami & Qizhen Du, 2020. "Prediction of Reservoir Quality from Log-Core and Seismic Inversion Analysis with an Artificial Neural Network: A Case Study from the Sawan Gas Field, Pakistan," Energies, MDPI, vol. 13(2), pages 1-19, January.

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