盐响应型疏水缔合聚合物增黏降滤失剂及作用机制

Salt-responsive hydrophobic associative polymer tackifying-filtrate reducer and its mechanism of action

摘要

基于聚合物分子构效关系,引入功能性单体,研发具有盐响应特性的增黏降滤失剂 PTF-1。 采用红外光谱、热重分析进行结构表征;结合钻井液性能评价、沉降稳定性分析、泥饼形貌表征、zeta 电位测试,综合研究 PTF-1 降滤失剂在水基钻井液中的降滤失机制。 结果表明:PTF-1 热解温度大于 300 ℃,2% PTF-1(质量分数)可分别使膨润土基浆和饱和盐水基浆 180 ℃/ 16 h 老化后的表观黏度提升 980%、400%,滤失量降低 70.77%、85.92%;2%加量下高温高压滤失量 F_HTHP 仅为25 mL;PTF-1 通过氢键、静电吸附、化学键和疏水缔合作用紧密吸附于黏土颗粒表面,维持钻井液体系稳定分散,优化泥饼质量;PTF-1 与盐协同可进一步实现优良的降滤失效果。

Abstract

Based on structure-activity relationship of polymer molecules, a tackifying-filtrate reducer PTF-1 with salt response characteristics was developed by introducing functional monomers. The structure was characterized by infrared spectroscopy and thermogravimetric analysis. Combined with drilling fluid performance evaluation, sedimentation stability analysis, mud cake morphology characterization and Zeta potential test, the mechanism of PTF-1 filtrate reducer in water-based drilling fluid was comprehensively studied. The results show that the pyrolysis temperature of PTF-1 is higher than 300 ℃. After aging at 180 ℃/ 16 h, adding 2% PTF-1 can increase the apparent viscosity of bentonite-based slurry and saturated brine-based slurry by 980% and 400% and the API fluid loss decreased by 70.77% and 85.92%, respectively. At a dosage of 2%, the F _HTHP is only 25 mL. PTF-1 is tightly adsorbed on the surface of clay particles through hydrogen bonding, electrostatic, chemical bonding and hydrophobic association to maintain the stable dispersion of drilling fluid system and optimize the quality of mud cake. In addition, PTF-1 cooperates with salt to further achieve excellent fluid loss reduction effect.

关键词

钻井液 / 疏水缔合聚合物 / 增黏降滤失剂 / 盐响应 / 抗温耐盐

Key words

drilling fluid / hydrophobic associative polymer / thickening-filtration reducer / salt response / temperature and salt resistance

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基金资助

国家自然科学基金项目(U2444216)

国家自然科学基金项目(52304010)

中石油前瞻性基础性项目课题(2024DJ10004)