A Synthetic Resin Filter Loss Reducer Made from Environmentally Friendly Biomasses

With more and more stringent environment protection requirements imposed on the petroleum exploration industry, drilling fluid additives are required to be nontoxic and have high performance. As the core additive of drilling fluids, filter loss reducer is required to have properties such as high temperature resistance, salt resistance, good filtration control performance, lowor nontoxicity, and good biodegradation. Using lignin as a raw material, a biomass synthetic resin filter loss reducer, LDR-501, was produced through biodegradation and chemical reaction. Evaluation of LDR-501 showed that the BOD₅/COD_Cr value is 0.26, indicating that LDR-501 is biodegradable. The EC₅₀ of LDR-501 is 440 000 mg/L, and the cloud point salinity of LDR-501 is 160 g/L. A base mud treated with LDR-501 had HTHP filtration rate of 18.6 mL after aging at 180℃ for 16 h, indicating that LDR-501 has good high temperature resistance, salinity resistance and good filtration control performance. The development of LDR-501 has accelerated the application of biomass resources in drilling fluid industry and laid the foundation of improving the environmental friendliness of water base drilling fluids.