在深井钻井中使用复杂的纳米乳液进行原位页岩润湿性调节以保持井筒稳定性,Langmuir

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在深井钻井中使用复杂的纳米乳液进行原位页岩润湿性调节以保持井筒稳定性
Langmuir ( IF 3.7 ) Pub Date : 2022-10-10 , DOI: 10.1021/acs.langmuir.2c01989
Ying Li _{1,

2} , Maosen Wang _{1,

2} , Yinghui An _{1,

2} , Kaijun Li _{1,

2} , Zhaojie Wei _{1,

2} , Kun Bo _{1,

2} , Pinlu Cao _{1,

2} , Mingyi Guo _{1,

2}

Affiliation

页岩表面的润湿性改变是解决由页岩水化引起的井筒不稳定性问题的潜在策略。在这项研究中，我们探索了一种水包油 (o/w) 纳米乳液，其中可溶性硅酸盐（硅酸锂和甲基硅酸钾）作为水相，有机硅烷（3-甲基丙烯酰氧基丙基三甲氧基硅烷 (KH570) 和n-辛基三乙氧基硅烷（n-OTES））作为油相，作为页岩抑制剂，通过在页岩表面原位形成疏水性“人工钻孔防护罩”来保持高温钻井作业中的井筒稳定性。页岩分散试验表明，纳米乳液的页岩回收率最高可达水（20%）的106.4%，回收的页岩屑在180 ℃热轧后仍保持原始完整性，表现出优越的缓蚀性能和抗腐蚀性能。温度升高。此外，回收的页岩岩屑在重新浸入水中后表现出斥水性，这归因于疏水膜，防止水渗透到页岩中。接触角测量的结果阐明了薄膜的润湿性，从亲水性到超疏水性（范围从 9.6-154°），^–2) 可以以 1.3 的比率获得。扫描电子显微镜图像表明，超疏水薄膜由紧密堆叠的网状纳米丝组成，直径为 7-17 nm，长度为几微米，重叠分布均匀的直径为 30 nm 的纳米球。X 射线衍射和傅里叶变换红外光谱证实该薄膜是接枝有长链烷基硅氧烷的结晶二氧化硅。假设独特的微纳米结构与硅氧烷改性相结合有助于疏水性。因此，本研究采用纳米乳液作为页岩水化抑制剂，通过形成润湿性可控的保护膜，为深井钻井工程中的井筒稳定提供了一种潜在的替代解决方案。此外，

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In Situ Shale Wettability Regulation Using Sophisticated Nanoemulsion to Maintain Wellbore Stability in Deep Well Drilling

Wettability alteration of the shale surface is a potential strategy to address wellbore instability issues arising from shale hydration. In this study, we have explored an oil-in-water (o/w) nanoemulsion, in which soluble silicate (lithium silicate and potassium methyl silicate) as the aqueous phase and organosilanes (3-methacryloxypropyltrimethoxysilane (KH570) and n-octyltriethoxysilane (n-OTES)) as the oil phase, as a shale inhibitor via forming a hydrophobic “artificial borehole shield” in situ on shale surfaces to maintain wellbore stability in high-temperature drilling operations. The shale dispersion test showed the highest shale recovery of nanoemulsion was up to 106.4% compared to that of water (20%), and recovered shale cuttings remained at the original integrity after hot rolling at 180 °C, indicating superior inhibition performance and resistance to elevated temperatures. Moreover, recovered shale cuttings manifested water repellency upon reimmersion in water, ascribed to the hydrophobic film, preventing water from permeating into the shale. The results of the contact angle measurement elucidated that the film wettability, from hydrophilic to superhydrophobic (ranging from 9.6–154°), can be achieved by altering the n-OTES-to-KH570 weight ratio from 0.2 to 2.25, and the film with the highest hydrophobicity (154°) and the lowest surface energy (3.17 mJ·m^–2) can be obtained at a ratio of 1.3. Scanning electron microscopy images demonstrated that the superhydrophobic film was composed of tightly stacked reticulate nanofilaments with a diameter of 7–17 nm and several micrometers in length and overlapped well-distributed nanospheres with a diameter of 30 nm. X-ray diffraction and Fourier transform infrared spectroscopy confirmed the film was crystalline silica grafted with long-chain alkylsiloxane. It is assumed that the unique micronanostructure combined with the siloxane modification contributed to the hydrophobicity. Consequently, this study provides a potential alternative solution for wellbore stabilization in deep well drilling engineering by employing nanoemulsion as a shale hydration inhibitor via forming a protective film with controllable wettability. Furthermore, it can be conferred a practical application due to easily available, less hazardous, and cost-effective materials.

更新日期：2022-10-10

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