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Home > Archive>Volume 50, Issue 6, 2023 >11-17. DOI:10.12143/j.ztgc.2023.06.002
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Preparation and properties evaluation of multifunctional drilling fluid additive for marine natural gas hydrate
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1.School of Petroleum Engineering, China University of Petroleum (East China)， Qingdao Shandong 266580， China;2.CNPC Engineering Technology R & D Company Limited， Beijing 102206， China

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P634;TE254

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    Abstract:

    To address the issue of wellbore instability resulted from hydrate decomposition during offshore drilling for natural gas hydrate， this paper developed a dual-purpose additive which possess both hydrate decomposition inhibition and filtration reduction properties. It was synthesized using 2-acrylamido-2-methylpropane sulfonic acid， dimethyldiallyl ammonium chloride and dimethoxy methylvinylsilane-modified cellulose as the starting materials （named as “CAD”）. The molecular structure was characterized through infrared spectroscopy. Thermal analysis revealed that the product decomposition initiated at around 290°C， demonstrating commendable thermal stability. The hydrate decomposition evaluation experiments indicated that the presence of 1% of the dual-function additive extended the total decomposition time of hydrates by approximately 1-fold and reduced the hydrate decomposition rate by 19.8%， which highlights the outstanding performance of hydrate decomposition inhibition. Filtration in freshwater-based slurry and 5 wt% NaCl saline-based slurry measured to be 6.8 and 8 mL respectively， signifying effective filtration reduction capabilities for hydrate reservoirs. The filtration for the freshwater-based slurry amounted to 6.5 mL at low temperatures， indicating the dual-function additive has favorable performance of low-temperature rheology. All these research offers substantial support for the advancement of high-performance drilling fluids designed for natural gas hydrates.

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History
  • Received:September 28,2023
  • Revised:November 09,2023
  • Adopted:November 09,2023
  • Online: November 29,2023
  • Published: November 10,2023
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