Preparation and properties evaluation of multifunctional drilling fluid additive for marine natural gas hydrate

WANG Jintang; Xü Jiaqi; LIAO Bo; ZHAO Ke; LIU Lei; BAI Yujing; LI Wenbiao; JIANG Haiyang; Lü Kaihe and SUN Jinsheng; ${author.authorNameEn}

doi:10.12143/j.ztgc.2023.06.002

2023 Vol. 50, No. 6

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Article navigation > DRILLING ENGINEERING > 2023 > 50(6): 11-17

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WANG Jintang, Xü Jiaqi, LIAO Bo, ZHAO Ke, LIU Lei, BAI Yujing, LI Wenbiao, JIANG Haiyang, Lü Kaihe and SUN Jinsheng, . 2023. Preparation and properties evaluation of multifunctional drilling fluid additive for marine natural gas hydrate. DRILLING ENGINEERING, 50(6): 11-17. doi: 10.12143/j.ztgc.2023.06.002

Citation:

WANG Jintang, Xü Jiaqi, LIAO Bo, ZHAO Ke, LIU Lei, BAI Yujing, LI Wenbiao, JIANG Haiyang, Lü Kaihe and SUN Jinsheng, . 2023. Preparation and properties evaluation of multifunctional drilling fluid additive for marine natural gas hydrate. DRILLING ENGINEERING, 50(6): 11-17. doi: 10.12143/j.ztgc.2023.06.002

Preparation and properties evaluation of multifunctional drilling fluid additive for marine natural gas hydrate

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

Received Date: 28 September 2023

Revised Date: 09 November 2023

Abstract

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.
- gas hydrate /
- drilling fluid /
- double-effect additive /
- inhibition of hydrate decomposition /
- filtration reduction

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References

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