Sodium (4-vinyl phenyl) methanesulfonate (SVM) is a distinct monomer synthesized from sodium sulfite (Na₂SO3), 2,6-di-tert-butyl-4-methylphenol, 4-chloromethyl styrene, and acetone. Apart from SVM, N-dimethyl acrylamide (DMAM), 2-acrylamide-2-methylpropanesulfonic acid (AMPS), and N-vinyl caprolactam (NVCL) were used as monomers, with ammonium persulfate serving as the initiator. Two types of polymers were prepared: a four-component polymer (PDASN) with SVM and a three-component polymer (PDAN) without SVM, both demonstrating temperature resistance of 220 °C and salt resistance of 5.0 wt% as filtrate reducers. The prepared fluid loss reducers were characterized using Fourier transform infrared spectroscopy (FT-IR), proton nuclear magnetic resonance (1H NMR), thermal gravimetric analysis (TGA), and gel permeation chromatography (GPC). The results demonstrate that the filtration of mud containing PDASN was 6.0 mL after high-temperature aging, with a high-temperature and high-pressure filtration loss of 20.0 mL. Mechanistic analysis reveals that the introduction of SVM into polymer backbones enhances the hydrophobicity of the polymer due to the significant steric hindrance of the methylene group linked to the sulfonic group under the influence of high temperature and NaCl. Moreover, the methylene group strengthens the chemical bonds within the chain, rendering it more resistant to decomposition at elevated temperatures and thereby increasing the stability and temperature resistance of the copolymer. Consequently, the thickness of the hydration layer of clay particles is augmented, ensuring the colloidal stability of water-based drilling fluid, restraining the agglomeration of clay particles, and enhancing filtration efficiency by forming a dense filter cake.

中文翻译：

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抗高温钻井液滤失剂的合成及机理分析


甲磺酸钠（4-乙烯基苯基）是由亚硫酸钠 （Na₂SO3）、2,6-二叔丁基-4-甲基苯酚、4-氯甲基苯乙烯和丙酮合成的独特单体。除 SVM 外，以 N-二甲基丙烯酰胺 （DMAM）、2-丙烯酰胺-2-甲基丙磺酸 （AMPS） 和 N-乙烯基己内酰胺 （NVCL） 为单体，以过硫酸铵为引发剂。制备了两种类型的聚合物：一种含 SVM 的四组分聚合物 （PDASN） 和一种不含 SVM 的三组分聚合物 （PDAN），作为滤失还原剂，两种聚合物均表现出 220 °C 的耐温性和 5.0 wt% 的耐盐性。采用傅里叶变换红外光谱 （FT-IR） 、质子核磁共振 （1H NMR）、热重分析 （TGA） 和凝胶渗透色谱 （GPC） 对制备的减少液体损失剂进行表征。结果表明，含PDASN的泥浆经高温时效后过滤量为6.0 mL，高温高压过滤损失为20.0 mL。机理分析表明，在高温和 NaCl 的影响下，由于与磺酸基团相连的亚甲基具有显着的空间位阻，因此将 SVM 引入聚合物主链中增强了聚合物的疏水性。此外，亚甲基增强了链内的化学键，使其在高温下更耐分解，从而提高了共聚物的稳定性和耐温性。因此，增加了粘土颗粒水化层的厚度，保证了水基钻井液的胶体稳定性，抑制了粘土颗粒的团聚，并通过形成致密的滤饼提高了过滤效率。