Sulfonylmethyl phenolic resin filtrate reducer for drilling fluid (SMP-Ⅰ)

Sulfomethyl phenolic resin for drilling fluid(SMP-Ⅱ)

Sulfonylmethyl phenolic resin as filtrate reducer for drilling fluid(SMP-Ⅲ)

Temperature and salt resistant fluid loss reducer coupled with phenolic resin zr-13 for drilling fluid

Modified lignite resin zr-16 with salt resistant and high temperature filtrate reducer for drilling fluid

Lignite resin spnh as filtrate reducer for drilling fluid

Sulfonated lignite SMC as filtrate reducer for drilling fluid

Sulfonated asphalt as filtrate reducer for drilling fluid

Polymer fluid loss reducer zr-21 for drilling fluid

Polyanionic cellulose CMC as filtrate reducer for drilling fluid

Filtration reducer hydroxyethyl cellulose HEC for drilling fluid