Volume 38 Issue 6
Nov.  2021
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2021  >  38(6): 684-690
LI Zhong, FENG Huanzhi, XING Xijin, et al.Preparation of gel microspheres for water based drilling fluids and its application in lost circulation control[J]. Drilling Fluid & Completion Fluid，2021, 38（6）：684-690 doi: 10.12358/j.issn.1001-5620.2021.06.004
Citation: LI Zhong, FENG Huanzhi, XING Xijin, et al.Preparation of gel microspheres for water based drilling fluids and its application in lost circulation control[J]. Drilling Fluid & Completion Fluid，2021, 38（6）：684-690 doi: 10.12358/j.issn.1001-5620.2021.06.004
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Preparation of Gel Microspheres for Water Based Drilling Fluids and Its Application in Lost Circulation Control

doi: 10.12358/j.issn.1001-5620.2021.06.004
  • 1.

    CNOOC Research Institute Ltd., Beijing 100028

  • 2.

    College of Safety and Ocean Engineering, China University of Petroleum (Beijing), Beijing 102249

  • 3.

    College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 102249

  • Received Date: 2021-06-25
  • Publish Date: 2021-11-30
    Abstract
  • A gel microsphere lost circulation material (LCM) has been synthesized through inverse emulsion polymerization. The composition, morphology and thermal stability of the gel microspheres were characterized using electron microscope, IR spectroscopy, thermogravimetric analysis and particle size analysis. It was found in these studies that the gel microspheres are in a micron spherical structure, with their particle sizes ranging from 4.5 μm to 68 μm. The initial thermal decomposition temperature of the gel microspheres is 150 ℃. The effects of the amount of emulsifier added into the reaction, mixing of the reactants and oil/water ratio on the particle size of the gel microspheres were examined and the performance of the gel microspheres evaluated. The results of the examination showed that the reaction conditions have a great influence on the sizes of the gel microspheres; as the amount of emulsifier increases, the average diameter of the gel microspheres decreases. Proper stirring promotes the stability of the emulsion, thereby reducing the particle sizes of the gel microspheres. An increase in oil/water ratio decreases the average particle size of the gel microspheres. The LCM evaluation test results showed that the gel microspheres have a good lost circulation control effect; gel microspheres, which are produced at 4% emulsifier, oil/water ratio of 7∶3 and without stirring have average particle size of 45.1 μm, and are the best LCM.

     

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