Abstract:

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. The performance evaluation conducting in laboratory and oilfield has indicated that YW-22 is a multifunctional additive. It has excellent performance in fluid loss control and shale inhibition, and can be used in high temperature drilling system. MeanwhileYW-22 can decrease the friction factor (Kf) significantly in drilling fluids. Its non-fluorescent property has been testified in laboratory and is of importance for well logging.

Key words: Filtration reducer, inhibitor, laboratory testing