耐高温壳核型油基钻井液纳米封堵剂的研制及性能评价
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1.中石化西南石油工程有限公司钻井工程研究院;2.成都理工大学能源学院

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TE254

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中国石油化工集团有限公司科技项目“威荣深层页岩气高效钻井关键技术研究”(编号:JPE19017-1)、中国石油化工集团有限公司科技项目“页岩气提速提效技术集成推广应用研究”(编号:JPE19017-4)。


Development and performance evaluation of high temperature-resistant core-shell nano plugging agent used for oil-based drilling fluid
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Chengdu University of Technology

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    摘要:

    页岩地层纳米级微孔、微裂缝发育,常规封堵剂粒径较大,难以封堵页岩内孔缝。采用壳核结构设计,以无机纳米二氧化硅为核,以聚(苯乙烯-丙烯酸丁酯-丙烯酸)为壳,制备了耐高温壳核型纳米封堵剂CLG-NM,通过红外光谱、透射电镜、动态光散射、热重实验对封堵剂进行了表征,通过页岩压力传递实验测试了其封堵性能。结果表明:纳米封堵剂CLG-NM粒径分布40~300nm,中值粒径89.4nm,在372℃以下可保持热稳定;CLG-NM与油基钻井液配伍性好,3%CLG-NM加入威页28-7HF井油基钻井液后钻井液流变性未发生明显变化,高温高压滤失量(180oC老化16h)从3.1mL降低至2.8mL,破乳电压始终高于700mV;CLG-NM与国内外同类产品KC-2、PT-Seal相比对页岩纳米孔-缝表现出更好的封堵效果。

    Abstract:

    Nano pores and micro fractures are well developed in shale formation. However, the particle size of conventional plugging agent is large and it is difficult to plug pores and fractures in shale. A high temperature-resistant core-shell nano plugging agent CLG-NM was prepared with inorganic nano silica as the core and poly (styrene-butyl acrylate-acrylic acid) as the shell. The plugging agent was characterized by infrared spectroscopy, transmission electron microscopy, dynamic light scattering and thermogravimetry, and its plugging performance was evaluated by shale pressure transfer experiment. The results show that the particle size distribution of CLG-NM is 40 ~ 300 nm, the median particle size is 89.4 nm. CLG-NM maintains thermal stability below 372 ℃. Furthermore, CLG-NM has good compatibility with oil-based drilling fluid. After 3% CLG-NM was added into the oil-based drilling fluid of Weiye 28-7hf well, the rheological property of the drilling fluid changed slightly. The high temperature and high pressure filtration (aging at 180oC for 16h) decreased from 3.1mL to 2.8mL, and the demulsification voltage kept higher than 700mV. Compared with KC-2 and PT-seal, CLG-NM has better plugging effect on the nano pores and fractures in shale.

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  • 收稿日期:2021-06-15
  • 最后修改日期:2021-08-03
  • 录用日期:2021-08-11
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