A polymer of monoallylamine, preferably a water-soluble polymer of monoallylamine, whether in free (i.e., unneutralized) form or in salt (i.e., partially or completely neutralized) form is used in conjunction with a sulfonated polymer such as a water-soluble lignosulfonate, condensed naphthalene sulfonate, or sulfonated vinyl aromatic polymer, to minimize fluid loss from the slurry during subterranean well cementing operations. The polymer of monoallyl amine may be a homopolymer or a copolymer, and may be crosslinked or uncrosslinked. These components interact with each other in the presence of water to produce a gelatinous material that tends to plug porous zones and minimize premature water loss from the well cement slurry when present in the subterranean well formation. In addition, the gelatinous material so formed prevents de-stabilization of the slurry in the well formation.
单
烯丙基胺聚合物,最好是单
烯丙基胺水溶性聚合物,无论是游离(即未中和)形式还是盐(即部分或完全中和)形式,都可与磺化聚合物(如
水溶性
木质素磺酸盐、缩合
萘磺酸盐或磺化
乙烯基芳香族聚合物)配合使用,以尽量减少地下油井固井作业期间泥浆中的流体损失。单
烯丙基胺聚合物可以是均聚物或共聚物,也可以是交联或未交联的。这些成分在有
水的情况下相互作用,产生一种凝胶状物质,当这种物质存在于地下井层中时,往往会堵塞多孔区,最大限度地减少
水从
水井
水泥浆中过早地流失。此外,这样形成的胶凝材料还能防止
水泥浆在井层中失去稳定性。