Volume 39 Issue 2
Jun.  2022
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LIANG Jiwen, LIU Hexing, WANG Chenglong, et al.Encapsulation of energy-storage microspheres[J]. Drilling Fluid & Completion Fluid，2022, 39（2）：214-220 doi: 10.12358/j.issn.1001-5620.2022.02.014
Citation: LIANG Jiwen, LIU Hexing, WANG Chenglong, et al.Encapsulation of energy-storage microspheres[J]. Drilling Fluid & Completion Fluid，2022, 39（2）：214-220 doi: 10.12358/j.issn.1001-5620.2022.02.014
shu

Encapsulation of Energy-storage Microspheres

doi: 10.12358/j.issn.1001-5620.2022.02.014
  • 1.

    Zhanjiang Branch of CNOOC (China) Co., Zhanjiang Guangdong 524057

  • 2.

    School of Petroleum Engineering, China University of Petroleum, Qingdao Shandong 266580

  • Received Date: 2021-10-29
  • Accepted Date: 2021-10-29
  • Rev Recd Date: 2021-12-20
  • Publish Date: 2022-06-23
    Abstract
  • To maintain the gas hydrate in stable conditions during deep offshore well cementing, a cement slurry with low heat of hydration should be used. Presently this is realized by adding heat energy storage agents in the oil well cement. The problem with this method is that the heat energy storage agent directly added into the cement slurry has poor compatibility. If the heat energy storage agent is absorbed into a high strength carrier microsphere to form an energy storage microsphere, the direct contact of the heat energy storage agent with the cement slurry can be avoided, and this should be an effective measure to solve the negative effects of heat energy storage agents on cement slurries. Opening of carrier microsphere walls will cause the leaking of the heat energy storage agent from the carrier microspheres, encapsulation of the microspheres is thus necessary. A new encapsulation methos is required to solve the problems existed with the existing encapsulation technology such as high cost and time consuming. In laboratory experiment, acrylic acid resin was chosen as the encapsulation material, and the carrier microspheres were encapsulated with spray method. Evaluation of the encapsulation showed that the best encapsulation can be achieved at a acrylic acid resin mass fraction of 20%. A simple efficient encapsulation method was thus developed. The energy storage microspheres thus encapsulated have good compressive strength, good high temperature stability and good resistance to alkaline environment. They can stay in marine environment for a long time. The development of this encapsulation technology and the energy storage microspheres has opened a new way of solving the incompatibility between heat energy storage agent and cement slurry, and is important to the effective isolation of natural gas hydrate. It has also provided a clue for the development of additive carriers for oil well cement.

     

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