Volume 35 Issue 4
Jul.  2018
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2018  >  35(4): 126-132
HUANG Bo, XU Jianping, JIANG Guancheng, WANG Qiaozhi, SU Yanhui, BAI Xiangshuang. Numerical Simulation of Formation Damage by Clay Swelling[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(4): 126-132. doi: 10.3969/j.issn.1001-5620.2018.04.023
Citation: HUANG Bo, XU Jianping, JIANG Guancheng, WANG Qiaozhi, SU Yanhui, BAI Xiangshuang. Numerical Simulation of Formation Damage by Clay Swelling[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(4): 126-132. doi: 10.3969/j.issn.1001-5620.2018.04.023
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Numerical Simulation of Formation Damage by Clay Swelling

doi: 10.3969/j.issn.1001-5620.2018.04.023

  • 1. CNOOC EnerTech-Drilling & Production Co., Tianjin 300450;

  • 2. School of Petroleum Engineering, China University of Petroleum, Beijing 102249;

  • 3. State Key Laboratory of Oil and Gas Resource and Prospecting, China University of Petroleum, Beijing 102249;

  • 4. Research Institute of Drilling Engineering, PetroChina Jilin Oil and Gas Field Company, Songyuan Jilin 138000

  • Received Date: 2018-02-25
  • Publish Date: 2018-07-30
    Abstract
  • In drilling, well completion or water injection operations, clays in formation rocks may swell when in contact with water base fluids, causing formation damage. Many studies have been conducted on formation damage caused by clay swelling, the numerical studies on the changing pattern of swelling with time and in space are scarcely seen. In our laboratory studies, a mathematical model has been established based on osmotic hydration of clay and the Fick diffusion of water molecules. Using this model, the changing pattern of the non-dimensional permeability of rocks around a wellbore with time and space was simulated, and the change of skin factor with time was calculated. It was demonstrated that the swelling of swelling has the characteristics of fast increase in the early stage, and slow increase to increase ceasing in the middle and late stages, meaning that formation damage is mainly contributed by the early swelling. At a certain point in the reservoir, the permeability impairment may be small, the formation damage is spatially extended, far from its origin, several meters, for instance, causing remarkable damage to the permeability of reservoir formations. To sum up, this study, based on simplified mathematic model, quantitatively simulated the spatial characteristics of the swelling of clays around a wellbore, and the swelling pattern of the clays with time, realizing the space-time dynamic simulation of single-factor controlled formation damage. The studies shed light on field engineering practices.

     

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