Preparation and Study of Fracture Sealing and Plugging Agent FPS
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摘要: 以废聚苯乙烯泡沫、甲基丙烯酸丁酯、丙烯酰胺为单体和原料,在一定条件下采用乳液聚合法合成出微裂缝封堵用胶乳护壁材料,该封堵材料粒径分布在0.1～10 μm 之间,热稳定性良好,抗温可达180 ℃。钻井液性能评价表明,加入2.0% 胶乳护壁材料的钻井液泥饼质量得到很大改善,淡水钻井液API 滤失量由45 mL 降低至13.6 mL,聚磺钾盐钻井液高温高压滤失量由12 mL 降低至4 mL;该护壁材料尺寸与微裂缝匹配良好,易在压差作用下在近井地带迅速黏结成膜,封堵效果优于现场用磺化沥青类材料。Abstract: A product, FPS, is synthesized with used foam styrene, butyl methacrylate and acrylamide using emulsion polymerization. FPS has particle sizes distributed between 0.1 μm and 10 μm, and is aimed at sealing and plugging micro-fractures in borehole walls during drilling. FPS is stable at temperature up to 180 ℃. Drilling fluid treated with FPS at concentration of 2% has good mud cakes, and reduces the filter loss of fresh water drilling fluid from 45 mL to 13.6 mL, and the filter loss of polymer sulfonate drilling fluid from 12 mL to 4 mL. FPS has particle sizes that are compatible with the sizes of micro-fractures and quickly forms a film in the nearwellbore zones. FPS has better performance as a sealing and plugging agent than sulfonated asphalt.
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Key words:
- Sealing and plugging agent /
- Micro-fracture /
- Emulsion polymerization /
- Used styrene
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