Volume 42 Issue 4
Jul.  2025
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ZHANG Ning, BAI Jianhua, WANG Shuo, et al.Preparation and evaluation of a solid sustained-release block removing stick for offshore unmanned platforms[J]. Drilling Fluid & Completion Fluid，2025, 42（4）：554-559 doi: 10.12358/j.issn.1001-5620.2025.04.016
Citation: ZHANG Ning, BAI Jianhua, WANG Shuo, et al.Preparation and evaluation of a solid sustained-release block removing stick for offshore unmanned platforms[J]. Drilling Fluid & Completion Fluid，2025, 42（4）：554-559 doi: 10.12358/j.issn.1001-5620.2025.04.016
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Preparation and Evaluation of a Solid Sustained-Release Block Removing Stick for Offshore Unmanned Platforms

doi: 10.12358/j.issn.1001-5620.2025.04.016
  • 1.

    Tianjin Branch of CNOOC (China) Co., Ltd., Tianjin 300459

  • 2.

    Production Optimization, China Oilfield Services Limited, Tianjin 300459

  • 3.

    Integrated Solution and New Energy, China Oilfield Services Limited, Tianjin 300459

  • 4.

    Engineering Technology Branch, CNOOC Energy Technology and Services Limited, Tianjin 300459

  • Received Date: 2025-01-13
  • Accepted Date: 2025-03-30
  • Rev Recd Date: 2025-02-20
  • Publish Date: 2025-07-31
    Abstract
  • Acid job is a common measure taken to remove formation damage caused by blocking. The acids presently used generally have large volumes and storage risks, and are not suitable for operations on unmanned platforms. To solve this problem, a solid sustained-release block removing stick that release additives in a sustained manner has been developed. This solid sustained-release block removing stick is developed using ethylene glycol, polyvinyl alcohol, catalyst and adhesive as coating materials and powdered block removing agents as the wrapped materials. Factors affecting the performance of the solid sustained-release block removing stick, such as the reaction temperature, the type and content of the polyvinyl alcohol, the contents of the catalyst and the adhesive as well as the coating materials and the wrapped materials, were studied, and the optimum synthetic condition of the stick was obtained. Evaluation of the solid sustained-release block removing stick shows that the rate of acid release of the stick in 24 h at 65℃ is 42.3%, and 88.8% of CaCO3 is dissolved by the released acids. The rate of corrosion of the N80 steel plate by this stick is 0.57 g/(m2·h).

     

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