A non-fluorescent shale/ filtration controller, YW-22, has been synthesized which is a copolymer of a water-soluble cationic monomer and an oil-soluble monomer.

• 介绍了一种新型无荧光防塌降滤失剂YW 2 2的性能研究情况 ,它是一种油溶性单体和水溶性阳离子单体的共聚物。