| 摘要: |
| 目的 为了缓解深井、超深井钻井过程中高温环境下泥页岩水化膨胀导致井壁失稳的问题，开展了耐温性页岩抑制剂的研究。方法 基于绿色多糖材料羟丙基–β–环糊精，以γ–甲基丙烯酰氧基丙基三甲氧基硅烷、丙烯酰胺和二甲基二烯丙基氯化铵作为反应单体，采用水溶液聚合法制备了一种绿色与抑制性能兼备的新型耐温页岩抑制剂（PKAD）。通过FTIR、H NMR进行分子结构表征；通过线性膨胀、岩屑滚动回收等实验评价PKAD的抑制性能；并研究其生物降解性。结果 材料表征证明成功合成了页岩抑制剂PKAD，评价实验验证了PKAD能够显著降低线性膨胀量超70%, 160 ℃岩屑热滚回收率为92.6%，200 ℃的岩屑滚动回收率为85.7%。机理研究表明，PKAD能够通过降低黏土表面负电荷和增加黏土表面疏水性两种抑制机理从而实现抑制效果。此外，PKAD的BOD5/ CODCr的比值为0.31，说明其具备生物降解性。结论 基于羟丙基–β–环糊精制备的PKAD具有良好的抑制性能和耐温性能，对天然材料改性具有一定的指导意义。 |
| 关键词: 泥页岩 环糊精 井壁失稳 页岩抑制剂 |
| DOI：10.3969/j.issn.1007-3426.2025.03.013 |
| 分类号: |
| 基金项目: |
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| Preparation and performance evaluation of modified cyclodextrin shale inhibitor |
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TANG Feiyun1, ZHONG Cheng1, AI Jiawei2,3, SONG Fang4, CHEN Fu1
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1.College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, Sichuan, China;2.Xinjiang Branch, CNPC Chuanqing Drilling Engineering Co., Ltd., Korla, Xinjiang, China;3.CCDC Drilling and Production Engineering Technology Research Institute, CNPC Chuanqing Drilling Engineering Co., Ltd., Guanghan, Sichuan, China;4.Chengdu Xiyouhuawei Science & Technology Co., Ltd., Chengdu, Sichuan, China
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| Abstract: |
| Objective To mitigate the wellbore instability due to mud shale hydration expansion in high-temperature environment during deep and ultra-deep wells drilling, the research on temperature-resistant shale inhibitors is carried out. Method A novel shale inhibitor (PKAD) with both green and inhibition properties was synthesized via aqueous polymerization using hydroxypropyl-β-cyclodextrin, a green polysaccharide, along with γ-methacryloyloxypropyltrimethoxysilane, acrylamide, and diallyldimethylammonium chloride as reaction monomers. The molecular structure was characterized by FTIR and H NMR; the inhibition performance of PKAD was evaluated through experiments such as linear expansion and rock debris rolling recovery; and its biodegradability was also studied. Result The material characterization confirmed the successful synthesis of PKAD, and the evaluation experiment demonstrated that PKAD could significantly reduce linear expansion by over 70%. The hot rolling recovery rate of rock debris at 160 ℃ was 92.6%, and the rolling recovery rate of rock debris at 200 ℃ was 85.7%. Mechanism studies showed that PKAD could achieve inhibitory effects by reducing the negative charge on the clay surface and enhancing the hydrophobicity of the clay surface. Additionally, the BOD5/CODCr ratio of PKAD was 0.31, indicating its biodegradability. Conclusion PKAD prepared by refining hydroxypropyl-β-cyclodextrin has good inhibition and temperature resistance properties, which has a certain guiding significance for the modification of natural materials. |
| Key words: mud shale cyclodextrin wellbore instability shale inhibitor |
